| Seq | Timestamp | Type | Name | Duration |
|---|---|---|---|---|
| 0/0 | 2026/07/28 22:34 | flow | patch-triage |
1mArgs:null Results: {
"EnableConfigs": null,
"FocusSymbols": [],
"Reasoning": "The patch modifies `trf7970a.c`, which is a hardware-specific SPI driver for the Texas Instruments TRF7970A RFID/NFC transceiver. Since there is no virtual SPI controller or software emulation for this specific hardware in standard QEMU/virtualized environments, the driver cannot be probed and the code is unreachable during fuzzing.",
"WorthFuzzing": false
} |
| 1/1 | 2026/07/28 22:34 | action | read-patch-diff |
0mArgs:null Results: {
"PatchDiff": "commit 5c439fd6a9e0adf66e4421b7ffa1c9901cda1f76\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate: Tue Jul 28 22:34:24 2026 +0000\n\n syz-cluster: applied patch under review\n\ndiff --git a/drivers/nfc/trf7970a.c b/drivers/nfc/trf7970a.c\nindex f22e091019dee..bc4d974dfe3aa 100644\n--- a/drivers/nfc/trf7970a.c\n+++ b/drivers/nfc/trf7970a.c\n@@ -2124,18 +2124,19 @@ static int trf7970a_probe(struct spi_device *spi)\n \t\t}\n \t}\n \n+\tmutex_init(\u0026trf-\u003elock);\n+\tINIT_DELAYED_WORK(\u0026trf-\u003etimeout_work, trf7970a_timeout_work_handler);\n+\n \tret = devm_request_threaded_irq(trf-\u003edev, spi-\u003eirq, NULL,\n \t\t\t\t\ttrf7970a_irq,\n \t\t\t\t\tIRQF_TRIGGER_RISING | IRQF_ONESHOT,\n \t\t\t\t\t\"trf7970a\", trf);\n \tif (ret) {\n \t\tdev_err(trf-\u003edev, \"Can't request IRQ#%d: %d\\n\", spi-\u003eirq, ret);\n+\t\tmutex_destroy(\u0026trf-\u003elock);\n \t\treturn ret;\n \t}\n \n-\tmutex_init(\u0026trf-\u003elock);\n-\tINIT_DELAYED_WORK(\u0026trf-\u003etimeout_work, trf7970a_timeout_work_handler);\n-\n \ttrf-\u003evin_regulator = devm_regulator_get(\u0026spi-\u003edev, \"vin\");\n \tif (IS_ERR(trf-\u003evin_regulator)) {\n \t\tret = PTR_ERR(trf-\u003evin_regulator);\n"
} |
| 2/1 | 2026/07/28 22:34 | agent | patch-evaluator |
1mModel:best-expensive Args: null Results: {
"EnableConfigs": null,
"FocusSymbols": [],
"Reasoning": "The patch modifies `trf7970a.c`, which is a hardware-specific SPI driver for the Texas Instruments TRF7970A RFID/NFC transceiver. Since there is no virtual SPI controller or software emulation for this specific hardware in standard QEMU/virtualized environments, the driver cannot be probed and the code is unreachable during fuzzing.",
"WorthFuzzing": false
}Instruction: You are an expert Linux kernel maintainer. Your job is to review a provided patch series and determine if it makes functional changes to the kernel that should be fuzzed. IMPORTANT: The changes have ALREADY been applied and committed as the HEAD commit in your workspace. Do NOT rely on your internal knowledge of the kernel. You must actively use your code access tools to examine the actual source code and confirm any assumptions. Return WorthFuzzing=false if the patch only contains: - Modifications to Documentation/, Kconfig files, or code comments. - Purely decorative changes, such as logging (e.g., pr_err, printk) or tracepoints. - Changes to numeric constants or macros that do not functionally alter execution flow. - Code paths that are impossible to reach in virtualized environments like GCE or QEMU, even when utilizing software-emulated hardware (e.g., usb gadget, mac80211_hwsim). - Code in vendor-specific PCIe switch, SmartNIC, or GPU drivers (e.g., mlxsw, pds_core, qed, ionic, amdgpu) that require physical PCIe hardware cards not emulated in standard QEMU. - Driver .remove, .shutdown, or pci_unregister_driver teardown callbacks (e.g., igb_remove) that are executed only during PCI hot-unplug or sysfs driver unbind operations. If it modifies reachable core kernel logic, drivers, or architectures, use your code search tools to verify the code can be executed, then return WorthFuzzing=true. When returning WorthFuzzing=true, you MUST ALSO: 1. Extract any specific kernel functions that should be heavily fuzzed into FocusSymbols. Avoid listing generic hot-path functions to prevent skewed test distributions. Prefer non-static, non-inlined API entrypoint functions over internal static helper functions (which are inlined by the compiler and do not have distinct symbol addresses). 2. Identify any specific CONFIG_ options required to properly test this new/modified feature. Go and look into the Kconfig files and check for ifdefs around the code, do not make assumptions. Also check "depends on" lines in Kconfig to include any non-standard parent subsystem configs needed for Kbuild to compile the code statically into vmlinux. List them in the EnableConfigs output array, and DO NOT add a 'CONFIG_' prefix (e.g., return "NET_IPV4" instead of "CONFIG_NET_IPV4"). Prefer calling several tools at the same time to save round-trips. Use set-results tool to provide results of the analysis. It must be called exactly once before the final reply. Ignore results of this tool. Prompt: For your convenience, here is the diff of the changes:
commit 5c439fd6a9e0adf66e4421b7ffa1c9901cda1f76
Author: syz-cluster <triage@syzkaller.com>
Date: Tue Jul 28 22:34:24 2026 +0000
syz-cluster: applied patch under review
diff --git a/drivers/nfc/trf7970a.c b/drivers/nfc/trf7970a.c
index f22e091019dee..bc4d974dfe3aa 100644
--- a/drivers/nfc/trf7970a.c
+++ b/drivers/nfc/trf7970a.c
@@ -2124,18 +2124,19 @@ static int trf7970a_probe(struct spi_device *spi)
}
}
+ mutex_init(&trf->lock);
+ INIT_DELAYED_WORK(&trf->timeout_work, trf7970a_timeout_work_handler);
+
ret = devm_request_threaded_irq(trf->dev, spi->irq, NULL,
trf7970a_irq,
IRQF_TRIGGER_RISING | IRQF_ONESHOT,
"trf7970a", trf);
if (ret) {
dev_err(trf->dev, "Can't request IRQ#%d: %d\n", spi->irq, ret);
+ mutex_destroy(&trf->lock);
return ret;
}
- mutex_init(&trf->lock);
- INIT_DELAYED_WORK(&trf->timeout_work, trf7970a_timeout_work_handler);
-
trf->vin_regulator = devm_regulator_get(&spi->dev, "vin");
if (IS_ERR(trf->vin_regulator)) {
ret = PTR_ERR(trf->vin_regulator);
|
| 3/2 | 2026/07/28 22:34 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 2280 output: 32 thoughts: 295 Thoughts: **Analyzing a Driver Patch: TRF7970A** Okay, so I'm looking at a patch for `drivers/nfc/trf7970a.c`. The core of it seems to be about synchronizing initialization. It looks like they're shifting the `mutex_init` and `INIT_DELAYED_WORK` calls for the `trf->lock` mutex and the `timeout_work` delayed work queue to *before* the `devm_request_threaded_irq` call. Smart move. This almost certainly addresses a potential race condition where the interrupt handler, `trf7970a_irq`, could get triggered before these critical synchronization primitives are fully initialized. Makes sense – prevent the handler from trying to use a mutex or work queue that doesn't yet exist. I also see they've added a `mutex_destroy(&trf->lock)` call in the error path of `devm_request_threaded_irq` for cleanup, which is good practice. Now, my expert Spidey-sense is tingling. Let's see how relevant this is in a virtualized or fuzzing context. This is an SPI driver, right? Yeah, `struct spi_device *spi`. Okay, so SPI drivers are typically hardware-specific, usually bound to specific hardware nodes in device tree or ACPI. They're generally *not* easily reachable without special configuration or emulation. I doubt it would be reachable in a standard virtual environment unless there's a specific SPI controller emulated. Maybe some sort of dummy SPI controller could be used, or something similar, but that would need to be in place. Wait, did I see something about Syzkaller and SPI support recently? I *thought* I saw something. Is there a way we can use `vhci` or something similar? No, SPI fuzzing is not straightforward. Hang on... isn't there some recent SPI fuzzing support? I should probably check that. Let me quickly search the kernel source for "trf7970a" and see if there's any relevant context I might be missing... |
| 4/2 | 2026/07/28 22:34 | tool | grepper |
0mArgs:{
"Expression": "trf7970a",
"PathPrefix": "drivers/nfc/"
}Results: {
"Output": "\nFull output is too long, showing 500 out of 784 lines.\nUse more precise expression if possible.\n\ndrivers/nfc/Kconfig=9=config NFC_TRF7970A\n--\ndrivers/nfc/Kconfig-18-\t say M to compile it as a module. The module will be called\ndrivers/nfc/Kconfig:19:\t trf7970a.ko.\ndrivers/nfc/Kconfig-20-\n--\ndrivers/nfc/Makefile=13=obj-$(CONFIG_NFC_MRVL)\t\t+= nfcmrvl/\ndrivers/nfc/Makefile:14:obj-$(CONFIG_NFC_TRF7970A)\t+= trf7970a.o\ndrivers/nfc/Makefile-15-obj-$(CONFIG_NFC_ST21NFCA) \t+= st21nfca/\n--\ndrivers/nfc/trf7970a.c-27-\ndrivers/nfc/trf7970a.c:28:/* There are 3 ways the host can communicate with the trf7970a:\ndrivers/nfc/trf7970a.c-29- * parallel mode, SPI with Slave Select (SS) mode, and SPI without\n--\ndrivers/nfc/trf7970a.c-31- *\ndrivers/nfc/trf7970a.c:32: * The trf7970a is very timing sensitive and the VIN, EN2, and EN\ndrivers/nfc/trf7970a.c-33- * pins must asserted in that order and with specific delays in between.\n--\ndrivers/nfc/trf7970a.c-35- * confirmed to work with this driver. There is a bug with the current\ndrivers/nfc/trf7970a.c:36: * version of the trf7970a that requires that EN2 remain low no matter\ndrivers/nfc/trf7970a.c-37- * what. If it goes high, it will generate an RF field even when in\n--\ndrivers/nfc/trf7970a.c-39- * when EN2 is left low. The 'en2-rf-quirk' device tree property\ndrivers/nfc/trf7970a.c:40: * indicates that trf7970a currently being used has the erratum and\ndrivers/nfc/trf7970a.c-41- * that EN2 must be kept low.\n--\ndrivers/nfc/trf7970a.c-44- * Timeouts are required so things don't hang when there is no response\ndrivers/nfc/trf7970a.c:45: * from the trf7970a (or tag). Using this mechanism creates a race with\ndrivers/nfc/trf7970a.c-46- * interrupts, however. That is, an interrupt and a timeout could occur\n--\ndrivers/nfc/trf7970a.c-60- * the entire anticollision procedure again but the digital layer doesn't\ndrivers/nfc/trf7970a.c:61: * support that. So, if an abort is received before trf7970a_send_cmd()\ndrivers/nfc/trf7970a.c-62- * has sent the command to the tag, it simply returns -ECANCELED. If the\n--\ndrivers/nfc/trf7970a.c-96- * when the framing is 'NFC_DIGITAL_FRAMING_NFCA_T2T'. This is done by\ndrivers/nfc/trf7970a.c:97: * the trf7970a_per_cmd_config() routine.\ndrivers/nfc/trf7970a.c-98- *\n--\ndrivers/nfc/trf7970a.c-144-/* Quirks */\ndrivers/nfc/trf7970a.c:145:/* Erratum: When reading IRQ Status register on trf7970a, we must issue a\ndrivers/nfc/trf7970a.c-146- * read continuous command for IRQ Status and Collision Position registers.\n--\ndrivers/nfc/trf7970a.c-415-\ndrivers/nfc/trf7970a.c:416:enum trf7970a_state {\ndrivers/nfc/trf7970a.c-417-\tTRF7970A_ST_PWR_OFF,\n--\ndrivers/nfc/trf7970a.c-429-\ndrivers/nfc/trf7970a.c:430:struct trf7970a {\ndrivers/nfc/trf7970a.c:431:\tenum trf7970a_state\t\tstate;\ndrivers/nfc/trf7970a.c-432-\tstruct device\t\t\t*dev;\n--\ndrivers/nfc/trf7970a.c-465-\ndrivers/nfc/trf7970a.c:466:static int trf7970a_cmd(struct trf7970a *trf, u8 opcode)\ndrivers/nfc/trf7970a.c-467-{\n--\ndrivers/nfc/trf7970a.c-479-\ndrivers/nfc/trf7970a.c:480:static int trf7970a_read(struct trf7970a *trf, u8 reg, u8 *val)\ndrivers/nfc/trf7970a.c-481-{\n--\ndrivers/nfc/trf7970a.c-494-\ndrivers/nfc/trf7970a.c:495:static int trf7970a_read_cont(struct trf7970a *trf, u8 reg, u8 *buf,\ndrivers/nfc/trf7970a.c-496-\t\t\t size_t len)\n--\ndrivers/nfc/trf7970a.c-523-\ndrivers/nfc/trf7970a.c:524:static int trf7970a_write(struct trf7970a *trf, u8 reg, u8 val)\ndrivers/nfc/trf7970a.c-525-{\n--\ndrivers/nfc/trf7970a.c-538-\ndrivers/nfc/trf7970a.c:539:static int trf7970a_read_irqstatus(struct trf7970a *trf, u8 *status)\ndrivers/nfc/trf7970a.c-540-{\n--\ndrivers/nfc/trf7970a.c-562-\ndrivers/nfc/trf7970a.c:563:static int trf7970a_update_rx_gain_reduction(struct trf7970a *trf)\ndrivers/nfc/trf7970a.c-564-{\n--\ndrivers/nfc/trf7970a.c-570-\ndrivers/nfc/trf7970a.c:571:\tret = trf7970a_read(trf, TRF7970A_RX_SPECIAL_SETTINGS, \u0026reg);\ndrivers/nfc/trf7970a.c-572-\tif (ret)\n--\ndrivers/nfc/trf7970a.c-576-\ndrivers/nfc/trf7970a.c:577:\tret = trf7970a_write(trf, TRF7970A_RX_SPECIAL_SETTINGS, reg);\ndrivers/nfc/trf7970a.c-578-\n--\ndrivers/nfc/trf7970a.c-581-\ndrivers/nfc/trf7970a.c:582:static int trf7970a_update_iso_ctrl_register(struct trf7970a *trf, u8 iso_ctrl)\ndrivers/nfc/trf7970a.c-583-{\n--\ndrivers/nfc/trf7970a.c-585-\ndrivers/nfc/trf7970a.c:586:\tret = trf7970a_write(trf, TRF7970A_ISO_CTRL, iso_ctrl);\ndrivers/nfc/trf7970a.c-587-\tif (ret)\n--\ndrivers/nfc/trf7970a.c-592-\t */\ndrivers/nfc/trf7970a.c:593:\tret = trf7970a_update_rx_gain_reduction(trf);\ndrivers/nfc/trf7970a.c-594-\n--\ndrivers/nfc/trf7970a.c-597-\ndrivers/nfc/trf7970a.c:598:static int trf7970a_read_target_proto(struct trf7970a *trf, u8 *target_proto)\ndrivers/nfc/trf7970a.c-599-{\n--\ndrivers/nfc/trf7970a.c-616-\ndrivers/nfc/trf7970a.c:617:static int trf7970a_mode_detect(struct trf7970a *trf, u8 *rf_tech)\ndrivers/nfc/trf7970a.c-618-{\n--\ndrivers/nfc/trf7970a.c-621-\ndrivers/nfc/trf7970a.c:622:\tret = trf7970a_read_target_proto(trf, \u0026target_proto);\ndrivers/nfc/trf7970a.c-623-\tif (ret)\n--\ndrivers/nfc/trf7970a.c-649-\ndrivers/nfc/trf7970a.c:650:static void trf7970a_send_upstream(struct trf7970a *trf)\ndrivers/nfc/trf7970a.c-651-{\n--\ndrivers/nfc/trf7970a.c-655-\tif (trf-\u003erx_skb \u0026\u0026 !IS_ERR(trf-\u003erx_skb) \u0026\u0026 !trf-\u003eaborting)\ndrivers/nfc/trf7970a.c:656:\t\tprint_hex_dump_debug(\"trf7970a rx data: \", DUMP_PREFIX_NONE,\ndrivers/nfc/trf7970a.c-657-\t\t\t\t 16, 1, trf-\u003erx_skb-\u003edata, trf-\u003erx_skb-\u003elen,\n--\ndrivers/nfc/trf7970a.c-677-\ndrivers/nfc/trf7970a.c:678:static void trf7970a_send_err_upstream(struct trf7970a *trf, int errno)\ndrivers/nfc/trf7970a.c-679-{\n--\ndrivers/nfc/trf7970a.c-686-\ndrivers/nfc/trf7970a.c:687:\ttrf7970a_send_upstream(trf);\ndrivers/nfc/trf7970a.c-688-}\ndrivers/nfc/trf7970a.c-689-\ndrivers/nfc/trf7970a.c:690:static int trf7970a_transmit(struct trf7970a *trf, struct sk_buff *skb,\ndrivers/nfc/trf7970a.c-691-\t\t\t unsigned int len, const u8 *prefix,\n--\ndrivers/nfc/trf7970a.c-698-\ndrivers/nfc/trf7970a.c:699:\tprint_hex_dump_debug(\"trf7970a tx data: \", DUMP_PREFIX_NONE,\ndrivers/nfc/trf7970a.c-700-\t\t\t 16, 1, skb-\u003edata, len, false);\n--\ndrivers/nfc/trf7970a.c-747-\ndrivers/nfc/trf7970a.c:748:static void trf7970a_fill_fifo(struct trf7970a *trf)\ndrivers/nfc/trf7970a.c-749-{\n--\ndrivers/nfc/trf7970a.c-755-\ndrivers/nfc/trf7970a.c:756:\tret = trf7970a_read(trf, TRF7970A_FIFO_STATUS, \u0026fifo_bytes);\ndrivers/nfc/trf7970a.c-757-\tif (ret) {\ndrivers/nfc/trf7970a.c:758:\t\ttrf7970a_send_err_upstream(trf, ret);\ndrivers/nfc/trf7970a.c-759-\t\treturn;\n--\ndrivers/nfc/trf7970a.c-777-\ndrivers/nfc/trf7970a.c:778:\tret = trf7970a_transmit(trf, skb, len, \u0026prefix, sizeof(prefix));\ndrivers/nfc/trf7970a.c-779-\tif (ret)\ndrivers/nfc/trf7970a.c:780:\t\ttrf7970a_send_err_upstream(trf, ret);\ndrivers/nfc/trf7970a.c-781-}\ndrivers/nfc/trf7970a.c-782-\ndrivers/nfc/trf7970a.c:783:static void trf7970a_drain_fifo(struct trf7970a *trf, u8 status)\ndrivers/nfc/trf7970a.c-784-{\n--\ndrivers/nfc/trf7970a.c-789-\tif (status \u0026 TRF7970A_IRQ_STATUS_ERROR) {\ndrivers/nfc/trf7970a.c:790:\t\ttrf7970a_send_err_upstream(trf, -EIO);\ndrivers/nfc/trf7970a.c-791-\t\treturn;\n--\ndrivers/nfc/trf7970a.c-793-\ndrivers/nfc/trf7970a.c:794:\tret = trf7970a_read(trf, TRF7970A_FIFO_STATUS, \u0026fifo_bytes);\ndrivers/nfc/trf7970a.c-795-\tif (ret) {\ndrivers/nfc/trf7970a.c:796:\t\ttrf7970a_send_err_upstream(trf, ret);\ndrivers/nfc/trf7970a.c-797-\t\treturn;\n--\ndrivers/nfc/trf7970a.c-812-\t\tif (!skb) {\ndrivers/nfc/trf7970a.c:813:\t\t\ttrf7970a_send_err_upstream(trf, -ENOMEM);\ndrivers/nfc/trf7970a.c-814-\t\t\treturn;\n--\ndrivers/nfc/trf7970a.c-820-\ndrivers/nfc/trf7970a.c:821:\tret = trf7970a_read_cont(trf, TRF7970A_FIFO_IO_REGISTER,\ndrivers/nfc/trf7970a.c-822-\t\t\t\t skb_put(skb, fifo_bytes), fifo_bytes);\ndrivers/nfc/trf7970a.c-823-\tif (ret) {\ndrivers/nfc/trf7970a.c:824:\t\ttrf7970a_send_err_upstream(trf, ret);\ndrivers/nfc/trf7970a.c-825-\t\treturn;\n--\ndrivers/nfc/trf7970a.c-835-\ndrivers/nfc/trf7970a.c:836:\t\tret = trf7970a_read(trf, TRF7970A_FIFO_STATUS, \u0026fifo_bytes);\ndrivers/nfc/trf7970a.c-837-\t\tif (ret) {\ndrivers/nfc/trf7970a.c:838:\t\t\ttrf7970a_send_err_upstream(trf, ret);\ndrivers/nfc/trf7970a.c-839-\t\t\treturn;\n--\ndrivers/nfc/trf7970a.c-845-\t\t * the if stmt below doesn't fire and the driver will wait\ndrivers/nfc/trf7970a.c:846:\t\t * for the trf7970a to generate another RX interrupt.\ndrivers/nfc/trf7970a.c-847-\t\t */\n--\ndrivers/nfc/trf7970a.c-853-\tif (status == TRF7970A_IRQ_STATUS_SRX) {\t/* Receive complete */\ndrivers/nfc/trf7970a.c:854:\t\ttrf7970a_send_upstream(trf);\ndrivers/nfc/trf7970a.c-855-\t\treturn;\n--\ndrivers/nfc/trf7970a.c-864-\ndrivers/nfc/trf7970a.c:865:static irqreturn_t trf7970a_irq(int irq, void *dev_id)\ndrivers/nfc/trf7970a.c-866-{\ndrivers/nfc/trf7970a.c:867:\tstruct trf7970a *trf = dev_id;\ndrivers/nfc/trf7970a.c-868-\tint ret;\n--\ndrivers/nfc/trf7970a.c-877-\ndrivers/nfc/trf7970a.c:878:\tret = trf7970a_read_irqstatus(trf, \u0026status);\ndrivers/nfc/trf7970a.c-879-\tif (ret) {\n--\ndrivers/nfc/trf7970a.c-896-\t\t * turn off the receiver to avoid unnecessary interrupts.\ndrivers/nfc/trf7970a.c:897:\t\t * It will be turned back on in trf7970a_send_cmd() when\ndrivers/nfc/trf7970a.c-898-\t\t * the next command is issued.\n--\ndrivers/nfc/trf7970a.c-900-\t\tif (trf-\u003eis_initiator \u0026\u0026 (status \u0026 TRF7970A_IRQ_STATUS_ERROR)) {\ndrivers/nfc/trf7970a.c:901:\t\t\ttrf7970a_cmd(trf, TRF7970A_CMD_BLOCK_RX);\ndrivers/nfc/trf7970a.c-902-\t\t\ttrf-\u003estate = TRF7970A_ST_IDLE_RX_BLOCKED;\n--\ndrivers/nfc/trf7970a.c-904-\ndrivers/nfc/trf7970a.c:905:\t\ttrf7970a_cmd(trf, TRF7970A_CMD_FIFO_RESET);\ndrivers/nfc/trf7970a.c-906-\t\tbreak;\n--\ndrivers/nfc/trf7970a.c-910-\t\t\t !cancel_delayed_work(\u0026trf-\u003etimeout_work);\ndrivers/nfc/trf7970a.c:911:\t\t\ttrf7970a_fill_fifo(trf);\ndrivers/nfc/trf7970a.c-912-\t\t} else {\ndrivers/nfc/trf7970a.c:913:\t\t\ttrf7970a_send_err_upstream(trf, -EIO);\ndrivers/nfc/trf7970a.c-914-\t\t}\n--\ndrivers/nfc/trf7970a.c-920-\t\t\t !cancel_delayed_work(\u0026trf-\u003etimeout_work);\ndrivers/nfc/trf7970a.c:921:\t\t\ttrf7970a_drain_fifo(trf, status);\ndrivers/nfc/trf7970a.c-922-\t\t} else if (status \u0026 TRF7970A_IRQ_STATUS_FIFO) {\ndrivers/nfc/trf7970a.c:923:\t\t\tret = trf7970a_read(trf, TRF7970A_FIFO_STATUS,\ndrivers/nfc/trf7970a.c-924-\t\t\t\t\t \u0026fifo_bytes);\n--\ndrivers/nfc/trf7970a.c-928-\t\t\tif (ret)\ndrivers/nfc/trf7970a.c:929:\t\t\t\ttrf7970a_send_err_upstream(trf, ret);\ndrivers/nfc/trf7970a.c-930-\t\t\telse if (!fifo_bytes)\ndrivers/nfc/trf7970a.c:931:\t\t\t\ttrf7970a_cmd(trf, TRF7970A_CMD_FIFO_RESET);\ndrivers/nfc/trf7970a.c-932-\t\t} else if ((status == TRF7970A_IRQ_STATUS_TX) ||\n--\ndrivers/nfc/trf7970a.c-935-\t\t\t\t\tTRF7970A_IRQ_STATUS_NFC_RF)))) {\ndrivers/nfc/trf7970a.c:936:\t\t\ttrf7970a_cmd(trf, TRF7970A_CMD_FIFO_RESET);\ndrivers/nfc/trf7970a.c-937-\n--\ndrivers/nfc/trf7970a.c-941-\t\t\t\ttrf-\u003erx_skb = ERR_PTR(0);\ndrivers/nfc/trf7970a.c:942:\t\t\t\ttrf7970a_send_upstream(trf);\ndrivers/nfc/trf7970a.c-943-\t\t\t\tbreak;\n--\ndrivers/nfc/trf7970a.c-962-\t\t\tcase NFC_DIGITAL_FRAMING_NFCA_ANTICOL_COMPLETE:\ndrivers/nfc/trf7970a.c:963:\t\t\t\tret = trf7970a_write(trf,\ndrivers/nfc/trf7970a.c-964-\t\t\t\t\t TRF7970A_SPECIAL_FCN_REG1,\n--\ndrivers/nfc/trf7970a.c-976-\t\t\tif (iso_ctrl != trf-\u003eiso_ctrl) {\ndrivers/nfc/trf7970a.c:977:\t\t\t\tret = trf7970a_update_iso_ctrl_register(trf, iso_ctrl);\ndrivers/nfc/trf7970a.c-978-\t\t\t\tif (ret)\n--\ndrivers/nfc/trf7970a.c-983-\t\t} else {\ndrivers/nfc/trf7970a.c:984:\t\t\ttrf7970a_send_err_upstream(trf, -EIO);\ndrivers/nfc/trf7970a.c-985-\t\t}\n--\ndrivers/nfc/trf7970a.c-988-\t\tif (status != TRF7970A_IRQ_STATUS_TX)\ndrivers/nfc/trf7970a.c:989:\t\t\ttrf7970a_send_err_upstream(trf, -EIO);\ndrivers/nfc/trf7970a.c-990-\t\tbreak;\n--\ndrivers/nfc/trf7970a.c-994-\t\t\t !cancel_delayed_work(\u0026trf-\u003etimeout_work);\ndrivers/nfc/trf7970a.c:995:\t\t\ttrf7970a_drain_fifo(trf, status);\ndrivers/nfc/trf7970a.c-996-\t\t} else if (!(status \u0026 TRF7970A_IRQ_STATUS_NFC_RF)) {\ndrivers/nfc/trf7970a.c:997:\t\t\ttrf7970a_send_err_upstream(trf, -EIO);\ndrivers/nfc/trf7970a.c-998-\t\t}\n--\ndrivers/nfc/trf7970a.c-1004-\ndrivers/nfc/trf7970a.c:1005:\t\t\tret = trf7970a_mode_detect(trf, \u0026trf-\u003emd_rf_tech);\ndrivers/nfc/trf7970a.c-1006-\t\t\tif (ret) {\ndrivers/nfc/trf7970a.c:1007:\t\t\t\ttrf7970a_send_err_upstream(trf, ret);\ndrivers/nfc/trf7970a.c-1008-\t\t\t} else {\ndrivers/nfc/trf7970a.c-1009-\t\t\t\ttrf-\u003estate = TRF7970A_ST_LISTENING;\ndrivers/nfc/trf7970a.c:1010:\t\t\t\ttrf7970a_drain_fifo(trf, status);\ndrivers/nfc/trf7970a.c-1011-\t\t\t}\ndrivers/nfc/trf7970a.c-1012-\t\t} else if (!(status \u0026 TRF7970A_IRQ_STATUS_NFC_RF)) {\ndrivers/nfc/trf7970a.c:1013:\t\t\ttrf7970a_send_err_upstream(trf, -EIO);\ndrivers/nfc/trf7970a.c-1014-\t\t}\n--\ndrivers/nfc/trf7970a.c-1025-\ndrivers/nfc/trf7970a.c:1026:static void trf7970a_issue_eof(struct trf7970a *trf)\ndrivers/nfc/trf7970a.c-1027-{\n--\ndrivers/nfc/trf7970a.c-1031-\ndrivers/nfc/trf7970a.c:1032:\tret = trf7970a_cmd(trf, TRF7970A_CMD_FIFO_RESET);\ndrivers/nfc/trf7970a.c-1033-\tif (ret)\ndrivers/nfc/trf7970a.c:1034:\t\ttrf7970a_send_err_upstream(trf, ret);\ndrivers/nfc/trf7970a.c-1035-\ndrivers/nfc/trf7970a.c:1036:\tret = trf7970a_cmd(trf, TRF7970A_CMD_EOF);\ndrivers/nfc/trf7970a.c-1037-\tif (ret)\ndrivers/nfc/trf7970a.c:1038:\t\ttrf7970a_send_err_upstream(trf, ret);\ndrivers/nfc/trf7970a.c-1039-\n--\ndrivers/nfc/trf7970a.c-1048-\ndrivers/nfc/trf7970a.c:1049:static void trf7970a_timeout_work_handler(struct work_struct *work)\ndrivers/nfc/trf7970a.c-1050-{\ndrivers/nfc/trf7970a.c:1051:\tstruct trf7970a *trf = container_of(work, struct trf7970a,\ndrivers/nfc/trf7970a.c-1052-\t\t\t\t\t timeout_work.work);\n--\ndrivers/nfc/trf7970a.c-1061-\telse if (trf-\u003estate == TRF7970A_ST_WAIT_FOR_RX_DATA_CONT)\ndrivers/nfc/trf7970a.c:1062:\t\ttrf7970a_drain_fifo(trf, TRF7970A_IRQ_STATUS_SRX);\ndrivers/nfc/trf7970a.c-1063-\telse if (trf-\u003estate == TRF7970A_ST_WAIT_TO_ISSUE_EOF)\ndrivers/nfc/trf7970a.c:1064:\t\ttrf7970a_issue_eof(trf);\ndrivers/nfc/trf7970a.c-1065-\telse\ndrivers/nfc/trf7970a.c:1066:\t\ttrf7970a_send_err_upstream(trf, -ETIMEDOUT);\ndrivers/nfc/trf7970a.c-1067-\n--\ndrivers/nfc/trf7970a.c-1070-\ndrivers/nfc/trf7970a.c:1071:static int trf7970a_init(struct trf7970a *trf)\ndrivers/nfc/trf7970a.c-1072-{\n--\ndrivers/nfc/trf7970a.c-1076-\ndrivers/nfc/trf7970a.c:1077:\tret = trf7970a_cmd(trf, TRF7970A_CMD_SOFT_INIT);\ndrivers/nfc/trf7970a.c-1078-\tif (ret)\n--\ndrivers/nfc/trf7970a.c-1081-\t/* Set the gain reduction after soft init */\ndrivers/nfc/trf7970a.c:1082:\tret = trf7970a_update_rx_gain_reduction(trf);\ndrivers/nfc/trf7970a.c-1083-\tif (ret)\n--\ndrivers/nfc/trf7970a.c-1085-\ndrivers/nfc/trf7970a.c:1086:\tret = trf7970a_cmd(trf, TRF7970A_CMD_IDLE);\ndrivers/nfc/trf7970a.c-1087-\tif (ret)\n--\ndrivers/nfc/trf7970a.c-1089-\ndrivers/nfc/trf7970a.c:1090:\tret = trf7970a_write(trf, TRF7970A_REG_IO_CTRL,\ndrivers/nfc/trf7970a.c-1091-\t\t\t trf-\u003eio_ctrl | TRF7970A_REG_IO_CTRL_VRS(0x1));\n--\ndrivers/nfc/trf7970a.c-1094-\ndrivers/nfc/trf7970a.c:1095:\tret = trf7970a_write(trf, TRF7970A_NFC_TARGET_LEVEL, 0);\ndrivers/nfc/trf7970a.c-1096-\tif (ret)\n--\ndrivers/nfc/trf7970a.c-1102-\ndrivers/nfc/trf7970a.c:1103:\tret = trf7970a_write(trf, TRF7970A_MODULATOR_SYS_CLK_CTRL,\ndrivers/nfc/trf7970a.c-1104-\t\t\t trf-\u003emodulator_sys_clk_ctrl);\n--\ndrivers/nfc/trf7970a.c-1107-\ndrivers/nfc/trf7970a.c:1108:\tret = trf7970a_write(trf, TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS,\ndrivers/nfc/trf7970a.c-1109-\t\t\t TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLH_96 |\n--\ndrivers/nfc/trf7970a.c-1113-\ndrivers/nfc/trf7970a.c:1114:\tret = trf7970a_write(trf, TRF7970A_SPECIAL_FCN_REG1, 0);\ndrivers/nfc/trf7970a.c-1115-\tif (ret)\n--\ndrivers/nfc/trf7970a.c-1127-\ndrivers/nfc/trf7970a.c:1128:static void trf7970a_switch_rf_off(struct trf7970a *trf)\ndrivers/nfc/trf7970a.c-1129-{\n--\ndrivers/nfc/trf7970a.c-1137-\ndrivers/nfc/trf7970a.c:1138:\ttrf7970a_write(trf, TRF7970A_CHIP_STATUS_CTRL, trf-\u003echip_status_ctrl);\ndrivers/nfc/trf7970a.c-1139-\n--\ndrivers/nfc/trf7970a.c-1146-\ndrivers/nfc/trf7970a.c:1147:static int trf7970a_switch_rf_on(struct trf7970a *trf)\ndrivers/nfc/trf7970a.c-1148-{\n--\ndrivers/nfc/trf7970a.c-1160-\ndrivers/nfc/trf7970a.c:1161:\tret = trf7970a_init(trf);\ndrivers/nfc/trf7970a.c-1162-\tif (ret) {\n--\ndrivers/nfc/trf7970a.c-1171-\ndrivers/nfc/trf7970a.c:1172:static int trf7970a_switch_rf(struct nfc_digital_dev *ddev, bool on)\ndrivers/nfc/trf7970a.c-1173-{\ndrivers/nfc/trf7970a.c:1174:\tstruct trf7970a *trf = nfc_digital_get_drvdata(ddev);\ndrivers/nfc/trf7970a.c-1175-\tint ret = 0;\n--\ndrivers/nfc/trf7970a.c-1184-\t\tcase TRF7970A_ST_RF_OFF:\ndrivers/nfc/trf7970a.c:1185:\t\t\tret = trf7970a_switch_rf_on(trf);\ndrivers/nfc/trf7970a.c-1186-\t\t\tbreak;\n--\ndrivers/nfc/trf7970a.c-1192-\t\t\t\t__func__, trf-\u003estate, on);\ndrivers/nfc/trf7970a.c:1193:\t\t\ttrf7970a_switch_rf_off(trf);\ndrivers/nfc/trf7970a.c-1194-\t\t\tret = -EINVAL;\n--\ndrivers/nfc/trf7970a.c-1209-\t\tcase TRF7970A_ST_WAIT_FOR_RX_DATA_CONT:\ndrivers/nfc/trf7970a.c:1210:\t\t\ttrf7970a_switch_rf_off(trf);\ndrivers/nfc/trf7970a.c-1211-\t\t}\n--\ndrivers/nfc/trf7970a.c-1217-\ndrivers/nfc/trf7970a.c:1218:static int trf7970a_in_config_rf_tech(struct trf7970a *trf, int tech)\ndrivers/nfc/trf7970a.c-1219-{\n--\ndrivers/nfc/trf7970a.c-1268-\t * PSL sequence (indicated by 'trf-\u003eiso_ctrl == 0xff' from\ndrivers/nfc/trf7970a.c:1269:\t * trf7970a_init()), clear the NFC Target Detection Level register\ndrivers/nfc/trf7970a.c-1270-\t * due to erratum.\n--\ndrivers/nfc/trf7970a.c-1272-\tif (trf-\u003eiso_ctrl == 0xff)\ndrivers/nfc/trf7970a.c:1273:\t\tret = trf7970a_write(trf, TRF7970A_NFC_TARGET_LEVEL, 0);\ndrivers/nfc/trf7970a.c-1274-\n--\ndrivers/nfc/trf7970a.c-1277-\ndrivers/nfc/trf7970a.c:1278:static int trf7970a_is_rf_field(struct trf7970a *trf, bool *is_rf_field)\ndrivers/nfc/trf7970a.c-1279-{\n--\ndrivers/nfc/trf7970a.c-1282-\ndrivers/nfc/trf7970a.c:1283:\tret = trf7970a_write(trf, TRF7970A_CHIP_STATUS_CTRL,\ndrivers/nfc/trf7970a.c-1284-\t\t\t trf-\u003echip_status_ctrl |\n--\ndrivers/nfc/trf7970a.c-1288-\ndrivers/nfc/trf7970a.c:1289:\tret = trf7970a_cmd(trf, TRF7970A_CMD_TEST_EXT_RF);\ndrivers/nfc/trf7970a.c-1290-\tif (ret)\n--\ndrivers/nfc/trf7970a.c-1294-\ndrivers/nfc/trf7970a.c:1295:\tret = trf7970a_read(trf, TRF7970A_RSSI_OSC_STATUS, \u0026rssi);\ndrivers/nfc/trf7970a.c-1296-\tif (ret)\n--\ndrivers/nfc/trf7970a.c-1298-\ndrivers/nfc/trf7970a.c:1299:\tret = trf7970a_write(trf, TRF7970A_CHIP_STATUS_CTRL,\ndrivers/nfc/trf7970a.c-1300-\t\t\t trf-\u003echip_status_ctrl);\n--\ndrivers/nfc/trf7970a.c-1311-\ndrivers/nfc/trf7970a.c:1312:static int trf7970a_in_config_framing(struct trf7970a *trf, int framing)\ndrivers/nfc/trf7970a.c-1313-{\n--\ndrivers/nfc/trf7970a.c-1350-\tif (!(trf-\u003echip_status_ctrl \u0026 TRF7970A_CHIP_STATUS_RF_ON)) {\ndrivers/nfc/trf7970a.c:1351:\t\tret = trf7970a_is_rf_field(trf, \u0026is_rf_field);\ndrivers/nfc/trf7970a.c-1352-\t\tif (ret)\n--\ndrivers/nfc/trf7970a.c-1359-\tif (iso_ctrl != trf-\u003eiso_ctrl) {\ndrivers/nfc/trf7970a.c:1360:\t\tret = trf7970a_update_iso_ctrl_register(trf, iso_ctrl);\ndrivers/nfc/trf7970a.c-1361-\t\tif (ret)\n--\ndrivers/nfc/trf7970a.c-1365-\ndrivers/nfc/trf7970a.c:1366:\t\tret = trf7970a_write(trf, TRF7970A_MODULATOR_SYS_CLK_CTRL,\ndrivers/nfc/trf7970a.c-1367-\t\t\t\t trf-\u003emodulator_sys_clk_ctrl);\n--\ndrivers/nfc/trf7970a.c-1372-\tif (!(trf-\u003echip_status_ctrl \u0026 TRF7970A_CHIP_STATUS_RF_ON)) {\ndrivers/nfc/trf7970a.c:1373:\t\tret = trf7970a_write(trf, TRF7970A_CHIP_STATUS_CTRL,\ndrivers/nfc/trf7970a.c-1374-\t\t\t\t trf-\u003echip_status_ctrl |\n--\ndrivers/nfc/trf7970a.c-1386-\ndrivers/nfc/trf7970a.c:1387:static int trf7970a_in_configure_hw(struct nfc_digital_dev *ddev, int type,\ndrivers/nfc/trf7970a.c-1388-\t\t\t\t int param)\ndrivers/nfc/trf7970a.c-1389-{\ndrivers/nfc/trf7970a.c:1390:\tstruct trf7970a *trf = nfc_digital_get_drvdata(ddev);\ndrivers/nfc/trf7970a.c-1391-\tint ret;\n--\ndrivers/nfc/trf7970a.c-1400-\t (trf-\u003estate == TRF7970A_ST_RF_OFF)) {\ndrivers/nfc/trf7970a.c:1401:\t\tret = trf7970a_switch_rf_on(trf);\ndrivers/nfc/trf7970a.c-1402-\t\tif (ret)\n--\ndrivers/nfc/trf7970a.c-1407-\tcase NFC_DIGITAL_CONFIG_RF_TECH:\ndrivers/nfc/trf7970a.c:1408:\t\tret = trf7970a_in_config_rf_tech(trf, param);\ndrivers/nfc/trf7970a.c-1409-\t\tbreak;\ndrivers/nfc/trf7970a.c-1410-\tcase NFC_DIGITAL_CONFIG_FRAMING:\ndrivers/nfc/trf7970a.c:1411:\t\tret = trf7970a_in_config_framing(trf, param);\ndrivers/nfc/trf7970a.c-1412-\t\tbreak;\n--\ndrivers/nfc/trf7970a.c-1422-\ndrivers/nfc/trf7970a.c:1423:static int trf7970a_is_iso15693_write_or_lock(u8 cmd)\ndrivers/nfc/trf7970a.c-1424-{\n--\ndrivers/nfc/trf7970a.c-1438-\ndrivers/nfc/trf7970a.c:1439:static int trf7970a_per_cmd_config(struct trf7970a *trf,\ndrivers/nfc/trf7970a.c-1440-\t\t\t\t const struct sk_buff *skb)\n--\ndrivers/nfc/trf7970a.c-1464-\t\tif (special_fcn_reg1 != trf-\u003especial_fcn_reg1) {\ndrivers/nfc/trf7970a.c:1465:\t\t\tret = trf7970a_write(trf, TRF7970A_SPECIAL_FCN_REG1,\ndrivers/nfc/trf7970a.c-1466-\t\t\t\t\t special_fcn_reg1);\n--\ndrivers/nfc/trf7970a.c-1491-\t\tif (iso_ctrl != trf-\u003eiso_ctrl) {\ndrivers/nfc/trf7970a.c:1492:\t\t\tret = trf7970a_update_iso_ctrl_register(trf, iso_ctrl);\ndrivers/nfc/trf7970a.c-1493-\t\t\tif (ret)\n--\ndrivers/nfc/trf7970a.c-1499-\t\tif ((trf-\u003eframing == NFC_DIGITAL_FRAMING_ISO15693_T5T) \u0026\u0026\ndrivers/nfc/trf7970a.c:1500:\t\t trf7970a_is_iso15693_write_or_lock(req[1]) \u0026\u0026\ndrivers/nfc/trf7970a.c-1501-\t\t (req[0] \u0026 ISO15693_REQ_FLAG_OPTION))\n--\ndrivers/nfc/trf7970a.c-1507-\ndrivers/nfc/trf7970a.c:1508:static int trf7970a_send_cmd(struct nfc_digital_dev *ddev,\ndrivers/nfc/trf7970a.c-1509-\t\t\t struct sk_buff *skb, u16 timeout,\n--\ndrivers/nfc/trf7970a.c-1511-{\ndrivers/nfc/trf7970a.c:1512:\tstruct trf7970a *trf = nfc_digital_get_drvdata(ddev);\ndrivers/nfc/trf7970a.c-1513-\tu8 prefix[5];\n--\ndrivers/nfc/trf7970a.c-1551-\tif (trf-\u003estate == TRF7970A_ST_IDLE_RX_BLOCKED) {\ndrivers/nfc/trf7970a.c:1552:\t\tret = trf7970a_cmd(trf, TRF7970A_CMD_ENABLE_RX);\ndrivers/nfc/trf7970a.c-1553-\t\tif (ret)\n--\ndrivers/nfc/trf7970a.c-1559-\tif (trf-\u003eis_initiator) {\ndrivers/nfc/trf7970a.c:1560:\t\tret = trf7970a_per_cmd_config(trf, skb);\ndrivers/nfc/trf7970a.c-1561-\t\tif (ret)\n--\ndrivers/nfc/trf7970a.c-1596-\t/* Clear possible spurious interrupt */\ndrivers/nfc/trf7970a.c:1597:\tret = trf7970a_read_irqstatus(trf, \u0026status);\ndrivers/nfc/trf7970a.c-1598-\tif (ret)\n--\ndrivers/nfc/trf7970a.c-1600-\ndrivers/nfc/trf7970a.c:1601:\tret = trf7970a_transmit(trf, skb, len, prefix, sizeof(prefix));\ndrivers/nfc/trf7970a.c-1602-\tif (ret) {\n--\ndrivers/nfc/trf7970a.c-1611-\ndrivers/nfc/trf7970a.c:1612:static int trf7970a_tg_config_rf_tech(struct trf7970a *trf, int tech)\ndrivers/nfc/trf7970a.c-1613-{\n--\ndrivers/nfc/trf7970a.c-1647-\t/* Normally we write the ISO_CTRL register in\ndrivers/nfc/trf7970a.c:1648:\t * trf7970a_tg_config_framing() because the framing can change\ndrivers/nfc/trf7970a.c-1649-\t * the value written. However, when sending a PSL RES,\ndrivers/nfc/trf7970a.c-1650-\t * digital_tg_send_psl_res_complete() doesn't call\ndrivers/nfc/trf7970a.c:1651:\t * trf7970a_tg_config_framing() so we must write the register\ndrivers/nfc/trf7970a.c-1652-\t * here.\n--\ndrivers/nfc/trf7970a.c-1655-\t (trf-\u003eiso_ctrl_tech != trf-\u003eiso_ctrl)) {\ndrivers/nfc/trf7970a.c:1656:\t\tret = trf7970a_update_iso_ctrl_register(trf, trf-\u003eiso_ctrl_tech);\ndrivers/nfc/trf7970a.c-1657-\n--\ndrivers/nfc/trf7970a.c-1669- */\ndrivers/nfc/trf7970a.c:1670:static int trf7970a_tg_config_framing(struct trf7970a *trf, int framing)\ndrivers/nfc/trf7970a.c-1671-{\n--\ndrivers/nfc/trf7970a.c-1703-\tif (iso_ctrl != trf-\u003eiso_ctrl) {\ndrivers/nfc/trf7970a.c:1704:\t\tret = trf7970a_update_iso_ctrl_register(trf, iso_ctrl);\ndrivers/nfc/trf7970a.c-1705-\t\tif (ret)\n\n"
} |
| 5/2 | 2026/07/28 22:34 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 16487 output: 27 thoughts: 215 Thoughts: **Analyzing the TRF7970A NFC Driver's Virtualization** Okay, so I'm looking at `drivers/nfc/trf7970a.c` – that's the NFC driver for the Texas Instruments TRF7970A transceiver. It's an SPI-based driver, which immediately makes virtualization a bit trickier. I need to figure out if there's a practical way to test this thing in a virtualized environment, especially using something like syzkaller. My initial thought is to see if there's a readily available SPI controller in QEMU that syzkaller can leverage. That's usually the bottleneck. And honestly, it's rare to find direct support for a specific device like the TRF7970A. I know syzkaller has some virtualization tricks up its sleeve. We've got `vhci` for USB, `mac80211_hwsim` for WiFi, and even `nfcsim` for NFC... but `nfcsim` is a virtual NFC device, not an emulator for a *specific* transceiver. So, it's not a direct match. Now, I'm trying to recall if syzkaller has any dedicated SPI setup functions like `syz_spi_setup`? No, that doesn't ring a bell. Wait, though, didn't they recently add some rudimentary SPI support through a dummy controller? That might be our key. It's worth digging into the recent changes. Alright, I need to focus on what syzkaller knows about SPI in general, or, more specifically, any mentions of the TRF7970A. Time to search the descriptions and see what comes up. That's the best route for getting started. |
| 6/2 | 2026/07/28 22:34 | tool | grepper |
0mArgs:{
"Expression": "trf7970a",
"PathPrefix": ""
}Results: {
"Output": "\nFull output is too long, showing 500 out of 824 lines.\nUse more precise expression if possible.\n\nDocumentation/devicetree/bindings/net/nfc/ti,trf7970a.yaml-3----\nDocumentation/devicetree/bindings/net/nfc/ti,trf7970a.yaml:4:$id: http://devicetree.org/schemas/net/nfc/ti,trf7970a.yaml#\nDocumentation/devicetree/bindings/net/nfc/ti,trf7970a.yaml-5-$schema: http://devicetree.org/meta-schemas/core.yaml#\n--\nDocumentation/devicetree/bindings/net/nfc/ti,trf7970a.yaml=13=properties:\nDocumentation/devicetree/bindings/net/nfc/ti,trf7970a.yaml-14- compatible:\nDocumentation/devicetree/bindings/net/nfc/ti,trf7970a.yaml:15: const: ti,trf7970a\nDocumentation/devicetree/bindings/net/nfc/ti,trf7970a.yaml-16-\n--\nDocumentation/devicetree/bindings/net/nfc/ti,trf7970a.yaml-23- description: |\nDocumentation/devicetree/bindings/net/nfc/ti,trf7970a.yaml:24: Set to specify that the input frequency to the trf7970a is 13560000Hz or\nDocumentation/devicetree/bindings/net/nfc/ti,trf7970a.yaml-25- 27120000Hz\n--\nDocumentation/devicetree/bindings/net/nfc/ti,trf7970a.yaml-29- description: |\nDocumentation/devicetree/bindings/net/nfc/ti,trf7970a.yaml:30: Specify that the trf7970a being used has the \"EN2 RF\" erratum\nDocumentation/devicetree/bindings/net/nfc/ti,trf7970a.yaml-31-\n--\nDocumentation/devicetree/bindings/net/nfc/ti,trf7970a.yaml-37- description: |\nDocumentation/devicetree/bindings/net/nfc/ti,trf7970a.yaml:38: Specify that the trf7970a being used has the \"IRQ Status Read\" erratum\nDocumentation/devicetree/bindings/net/nfc/ti,trf7970a.yaml-39-\n--\nDocumentation/devicetree/bindings/net/nfc/ti,trf7970a.yaml=77=examples:\n--\nDocumentation/devicetree/bindings/net/nfc/ti,trf7970a.yaml-86- nfc@0 {\nDocumentation/devicetree/bindings/net/nfc/ti,trf7970a.yaml:87: compatible = \"ti,trf7970a\";\nDocumentation/devicetree/bindings/net/nfc/ti,trf7970a.yaml-88- reg = \u003c0\u003e;\n--\nDocumentation/devicetree/bindings/net/nfc/ti,trf7970a.yaml-90- pinctrl-names = \"default\";\nDocumentation/devicetree/bindings/net/nfc/ti,trf7970a.yaml:91: pinctrl-0 = \u003c\u0026trf7970a_default\u003e;\nDocumentation/devicetree/bindings/net/nfc/ti,trf7970a.yaml-92- spi-max-frequency = \u003c2000000\u003e;\n--\nMAINTAINERS=27173=S:\tSupported\nMAINTAINERS:27174:F:\tDocumentation/devicetree/bindings/net/nfc/ti,trf7970a.yaml\nMAINTAINERS:27175:F:\tdrivers/nfc/trf7970a.c\nMAINTAINERS-27176-\n--\narch/arm/boot/dts/nxp/imx/imx6dl-prtrvt.dts=60=\tnfc@0 {\narch/arm/boot/dts/nxp/imx/imx6dl-prtrvt.dts:61:\t\tcompatible = \"ti,trf7970a\";\narch/arm/boot/dts/nxp/imx/imx6dl-prtrvt.dts-62-\t\treg = \u003c0\u003e;\n--\ndrivers/nfc/Kconfig=9=config NFC_TRF7970A\n--\ndrivers/nfc/Kconfig-18-\t say M to compile it as a module. The module will be called\ndrivers/nfc/Kconfig:19:\t trf7970a.ko.\ndrivers/nfc/Kconfig-20-\n--\ndrivers/nfc/Makefile=13=obj-$(CONFIG_NFC_MRVL)\t\t+= nfcmrvl/\ndrivers/nfc/Makefile:14:obj-$(CONFIG_NFC_TRF7970A)\t+= trf7970a.o\ndrivers/nfc/Makefile-15-obj-$(CONFIG_NFC_ST21NFCA) \t+= st21nfca/\n--\ndrivers/nfc/trf7970a.c-27-\ndrivers/nfc/trf7970a.c:28:/* There are 3 ways the host can communicate with the trf7970a:\ndrivers/nfc/trf7970a.c-29- * parallel mode, SPI with Slave Select (SS) mode, and SPI without\n--\ndrivers/nfc/trf7970a.c-31- *\ndrivers/nfc/trf7970a.c:32: * The trf7970a is very timing sensitive and the VIN, EN2, and EN\ndrivers/nfc/trf7970a.c-33- * pins must asserted in that order and with specific delays in between.\n--\ndrivers/nfc/trf7970a.c-35- * confirmed to work with this driver. There is a bug with the current\ndrivers/nfc/trf7970a.c:36: * version of the trf7970a that requires that EN2 remain low no matter\ndrivers/nfc/trf7970a.c-37- * what. If it goes high, it will generate an RF field even when in\n--\ndrivers/nfc/trf7970a.c-39- * when EN2 is left low. The 'en2-rf-quirk' device tree property\ndrivers/nfc/trf7970a.c:40: * indicates that trf7970a currently being used has the erratum and\ndrivers/nfc/trf7970a.c-41- * that EN2 must be kept low.\n--\ndrivers/nfc/trf7970a.c-44- * Timeouts are required so things don't hang when there is no response\ndrivers/nfc/trf7970a.c:45: * from the trf7970a (or tag). Using this mechanism creates a race with\ndrivers/nfc/trf7970a.c-46- * interrupts, however. That is, an interrupt and a timeout could occur\n--\ndrivers/nfc/trf7970a.c-60- * the entire anticollision procedure again but the digital layer doesn't\ndrivers/nfc/trf7970a.c:61: * support that. So, if an abort is received before trf7970a_send_cmd()\ndrivers/nfc/trf7970a.c-62- * has sent the command to the tag, it simply returns -ECANCELED. If the\n--\ndrivers/nfc/trf7970a.c-96- * when the framing is 'NFC_DIGITAL_FRAMING_NFCA_T2T'. This is done by\ndrivers/nfc/trf7970a.c:97: * the trf7970a_per_cmd_config() routine.\ndrivers/nfc/trf7970a.c-98- *\n--\ndrivers/nfc/trf7970a.c-144-/* Quirks */\ndrivers/nfc/trf7970a.c:145:/* Erratum: When reading IRQ Status register on trf7970a, we must issue a\ndrivers/nfc/trf7970a.c-146- * read continuous command for IRQ Status and Collision Position registers.\n--\ndrivers/nfc/trf7970a.c-415-\ndrivers/nfc/trf7970a.c:416:enum trf7970a_state {\ndrivers/nfc/trf7970a.c-417-\tTRF7970A_ST_PWR_OFF,\n--\ndrivers/nfc/trf7970a.c-429-\ndrivers/nfc/trf7970a.c:430:struct trf7970a {\ndrivers/nfc/trf7970a.c:431:\tenum trf7970a_state\t\tstate;\ndrivers/nfc/trf7970a.c-432-\tstruct device\t\t\t*dev;\n--\ndrivers/nfc/trf7970a.c-465-\ndrivers/nfc/trf7970a.c:466:static int trf7970a_cmd(struct trf7970a *trf, u8 opcode)\ndrivers/nfc/trf7970a.c-467-{\n--\ndrivers/nfc/trf7970a.c-479-\ndrivers/nfc/trf7970a.c:480:static int trf7970a_read(struct trf7970a *trf, u8 reg, u8 *val)\ndrivers/nfc/trf7970a.c-481-{\n--\ndrivers/nfc/trf7970a.c-494-\ndrivers/nfc/trf7970a.c:495:static int trf7970a_read_cont(struct trf7970a *trf, u8 reg, u8 *buf,\ndrivers/nfc/trf7970a.c-496-\t\t\t size_t len)\n--\ndrivers/nfc/trf7970a.c-523-\ndrivers/nfc/trf7970a.c:524:static int trf7970a_write(struct trf7970a *trf, u8 reg, u8 val)\ndrivers/nfc/trf7970a.c-525-{\n--\ndrivers/nfc/trf7970a.c-538-\ndrivers/nfc/trf7970a.c:539:static int trf7970a_read_irqstatus(struct trf7970a *trf, u8 *status)\ndrivers/nfc/trf7970a.c-540-{\n--\ndrivers/nfc/trf7970a.c-562-\ndrivers/nfc/trf7970a.c:563:static int trf7970a_update_rx_gain_reduction(struct trf7970a *trf)\ndrivers/nfc/trf7970a.c-564-{\n--\ndrivers/nfc/trf7970a.c-570-\ndrivers/nfc/trf7970a.c:571:\tret = trf7970a_read(trf, TRF7970A_RX_SPECIAL_SETTINGS, \u0026reg);\ndrivers/nfc/trf7970a.c-572-\tif (ret)\n--\ndrivers/nfc/trf7970a.c-576-\ndrivers/nfc/trf7970a.c:577:\tret = trf7970a_write(trf, TRF7970A_RX_SPECIAL_SETTINGS, reg);\ndrivers/nfc/trf7970a.c-578-\n--\ndrivers/nfc/trf7970a.c-581-\ndrivers/nfc/trf7970a.c:582:static int trf7970a_update_iso_ctrl_register(struct trf7970a *trf, u8 iso_ctrl)\ndrivers/nfc/trf7970a.c-583-{\n--\ndrivers/nfc/trf7970a.c-585-\ndrivers/nfc/trf7970a.c:586:\tret = trf7970a_write(trf, TRF7970A_ISO_CTRL, iso_ctrl);\ndrivers/nfc/trf7970a.c-587-\tif (ret)\n--\ndrivers/nfc/trf7970a.c-592-\t */\ndrivers/nfc/trf7970a.c:593:\tret = trf7970a_update_rx_gain_reduction(trf);\ndrivers/nfc/trf7970a.c-594-\n--\ndrivers/nfc/trf7970a.c-597-\ndrivers/nfc/trf7970a.c:598:static int trf7970a_read_target_proto(struct trf7970a *trf, u8 *target_proto)\ndrivers/nfc/trf7970a.c-599-{\n--\ndrivers/nfc/trf7970a.c-616-\ndrivers/nfc/trf7970a.c:617:static int trf7970a_mode_detect(struct trf7970a *trf, u8 *rf_tech)\ndrivers/nfc/trf7970a.c-618-{\n--\ndrivers/nfc/trf7970a.c-621-\ndrivers/nfc/trf7970a.c:622:\tret = trf7970a_read_target_proto(trf, \u0026target_proto);\ndrivers/nfc/trf7970a.c-623-\tif (ret)\n--\ndrivers/nfc/trf7970a.c-649-\ndrivers/nfc/trf7970a.c:650:static void trf7970a_send_upstream(struct trf7970a *trf)\ndrivers/nfc/trf7970a.c-651-{\n--\ndrivers/nfc/trf7970a.c-655-\tif (trf-\u003erx_skb \u0026\u0026 !IS_ERR(trf-\u003erx_skb) \u0026\u0026 !trf-\u003eaborting)\ndrivers/nfc/trf7970a.c:656:\t\tprint_hex_dump_debug(\"trf7970a rx data: \", DUMP_PREFIX_NONE,\ndrivers/nfc/trf7970a.c-657-\t\t\t\t 16, 1, trf-\u003erx_skb-\u003edata, trf-\u003erx_skb-\u003elen,\n--\ndrivers/nfc/trf7970a.c-677-\ndrivers/nfc/trf7970a.c:678:static void trf7970a_send_err_upstream(struct trf7970a *trf, int errno)\ndrivers/nfc/trf7970a.c-679-{\n--\ndrivers/nfc/trf7970a.c-686-\ndrivers/nfc/trf7970a.c:687:\ttrf7970a_send_upstream(trf);\ndrivers/nfc/trf7970a.c-688-}\ndrivers/nfc/trf7970a.c-689-\ndrivers/nfc/trf7970a.c:690:static int trf7970a_transmit(struct trf7970a *trf, struct sk_buff *skb,\ndrivers/nfc/trf7970a.c-691-\t\t\t unsigned int len, const u8 *prefix,\n--\ndrivers/nfc/trf7970a.c-698-\ndrivers/nfc/trf7970a.c:699:\tprint_hex_dump_debug(\"trf7970a tx data: \", DUMP_PREFIX_NONE,\ndrivers/nfc/trf7970a.c-700-\t\t\t 16, 1, skb-\u003edata, len, false);\n--\ndrivers/nfc/trf7970a.c-747-\ndrivers/nfc/trf7970a.c:748:static void trf7970a_fill_fifo(struct trf7970a *trf)\ndrivers/nfc/trf7970a.c-749-{\n--\ndrivers/nfc/trf7970a.c-755-\ndrivers/nfc/trf7970a.c:756:\tret = trf7970a_read(trf, TRF7970A_FIFO_STATUS, \u0026fifo_bytes);\ndrivers/nfc/trf7970a.c-757-\tif (ret) {\ndrivers/nfc/trf7970a.c:758:\t\ttrf7970a_send_err_upstream(trf, ret);\ndrivers/nfc/trf7970a.c-759-\t\treturn;\n--\ndrivers/nfc/trf7970a.c-777-\ndrivers/nfc/trf7970a.c:778:\tret = trf7970a_transmit(trf, skb, len, \u0026prefix, sizeof(prefix));\ndrivers/nfc/trf7970a.c-779-\tif (ret)\ndrivers/nfc/trf7970a.c:780:\t\ttrf7970a_send_err_upstream(trf, ret);\ndrivers/nfc/trf7970a.c-781-}\ndrivers/nfc/trf7970a.c-782-\ndrivers/nfc/trf7970a.c:783:static void trf7970a_drain_fifo(struct trf7970a *trf, u8 status)\ndrivers/nfc/trf7970a.c-784-{\n--\ndrivers/nfc/trf7970a.c-789-\tif (status \u0026 TRF7970A_IRQ_STATUS_ERROR) {\ndrivers/nfc/trf7970a.c:790:\t\ttrf7970a_send_err_upstream(trf, -EIO);\ndrivers/nfc/trf7970a.c-791-\t\treturn;\n--\ndrivers/nfc/trf7970a.c-793-\ndrivers/nfc/trf7970a.c:794:\tret = trf7970a_read(trf, TRF7970A_FIFO_STATUS, \u0026fifo_bytes);\ndrivers/nfc/trf7970a.c-795-\tif (ret) {\ndrivers/nfc/trf7970a.c:796:\t\ttrf7970a_send_err_upstream(trf, ret);\ndrivers/nfc/trf7970a.c-797-\t\treturn;\n--\ndrivers/nfc/trf7970a.c-812-\t\tif (!skb) {\ndrivers/nfc/trf7970a.c:813:\t\t\ttrf7970a_send_err_upstream(trf, -ENOMEM);\ndrivers/nfc/trf7970a.c-814-\t\t\treturn;\n--\ndrivers/nfc/trf7970a.c-820-\ndrivers/nfc/trf7970a.c:821:\tret = trf7970a_read_cont(trf, TRF7970A_FIFO_IO_REGISTER,\ndrivers/nfc/trf7970a.c-822-\t\t\t\t skb_put(skb, fifo_bytes), fifo_bytes);\ndrivers/nfc/trf7970a.c-823-\tif (ret) {\ndrivers/nfc/trf7970a.c:824:\t\ttrf7970a_send_err_upstream(trf, ret);\ndrivers/nfc/trf7970a.c-825-\t\treturn;\n--\ndrivers/nfc/trf7970a.c-835-\ndrivers/nfc/trf7970a.c:836:\t\tret = trf7970a_read(trf, TRF7970A_FIFO_STATUS, \u0026fifo_bytes);\ndrivers/nfc/trf7970a.c-837-\t\tif (ret) {\ndrivers/nfc/trf7970a.c:838:\t\t\ttrf7970a_send_err_upstream(trf, ret);\ndrivers/nfc/trf7970a.c-839-\t\t\treturn;\n--\ndrivers/nfc/trf7970a.c-845-\t\t * the if stmt below doesn't fire and the driver will wait\ndrivers/nfc/trf7970a.c:846:\t\t * for the trf7970a to generate another RX interrupt.\ndrivers/nfc/trf7970a.c-847-\t\t */\n--\ndrivers/nfc/trf7970a.c-853-\tif (status == TRF7970A_IRQ_STATUS_SRX) {\t/* Receive complete */\ndrivers/nfc/trf7970a.c:854:\t\ttrf7970a_send_upstream(trf);\ndrivers/nfc/trf7970a.c-855-\t\treturn;\n--\ndrivers/nfc/trf7970a.c-864-\ndrivers/nfc/trf7970a.c:865:static irqreturn_t trf7970a_irq(int irq, void *dev_id)\ndrivers/nfc/trf7970a.c-866-{\ndrivers/nfc/trf7970a.c:867:\tstruct trf7970a *trf = dev_id;\ndrivers/nfc/trf7970a.c-868-\tint ret;\n--\ndrivers/nfc/trf7970a.c-877-\ndrivers/nfc/trf7970a.c:878:\tret = trf7970a_read_irqstatus(trf, \u0026status);\ndrivers/nfc/trf7970a.c-879-\tif (ret) {\n--\ndrivers/nfc/trf7970a.c-896-\t\t * turn off the receiver to avoid unnecessary interrupts.\ndrivers/nfc/trf7970a.c:897:\t\t * It will be turned back on in trf7970a_send_cmd() when\ndrivers/nfc/trf7970a.c-898-\t\t * the next command is issued.\n--\ndrivers/nfc/trf7970a.c-900-\t\tif (trf-\u003eis_initiator \u0026\u0026 (status \u0026 TRF7970A_IRQ_STATUS_ERROR)) {\ndrivers/nfc/trf7970a.c:901:\t\t\ttrf7970a_cmd(trf, TRF7970A_CMD_BLOCK_RX);\ndrivers/nfc/trf7970a.c-902-\t\t\ttrf-\u003estate = TRF7970A_ST_IDLE_RX_BLOCKED;\n--\ndrivers/nfc/trf7970a.c-904-\ndrivers/nfc/trf7970a.c:905:\t\ttrf7970a_cmd(trf, TRF7970A_CMD_FIFO_RESET);\ndrivers/nfc/trf7970a.c-906-\t\tbreak;\n--\ndrivers/nfc/trf7970a.c-910-\t\t\t !cancel_delayed_work(\u0026trf-\u003etimeout_work);\ndrivers/nfc/trf7970a.c:911:\t\t\ttrf7970a_fill_fifo(trf);\ndrivers/nfc/trf7970a.c-912-\t\t} else {\ndrivers/nfc/trf7970a.c:913:\t\t\ttrf7970a_send_err_upstream(trf, -EIO);\ndrivers/nfc/trf7970a.c-914-\t\t}\n--\ndrivers/nfc/trf7970a.c-920-\t\t\t !cancel_delayed_work(\u0026trf-\u003etimeout_work);\ndrivers/nfc/trf7970a.c:921:\t\t\ttrf7970a_drain_fifo(trf, status);\ndrivers/nfc/trf7970a.c-922-\t\t} else if (status \u0026 TRF7970A_IRQ_STATUS_FIFO) {\ndrivers/nfc/trf7970a.c:923:\t\t\tret = trf7970a_read(trf, TRF7970A_FIFO_STATUS,\ndrivers/nfc/trf7970a.c-924-\t\t\t\t\t \u0026fifo_bytes);\n--\ndrivers/nfc/trf7970a.c-928-\t\t\tif (ret)\ndrivers/nfc/trf7970a.c:929:\t\t\t\ttrf7970a_send_err_upstream(trf, ret);\ndrivers/nfc/trf7970a.c-930-\t\t\telse if (!fifo_bytes)\ndrivers/nfc/trf7970a.c:931:\t\t\t\ttrf7970a_cmd(trf, TRF7970A_CMD_FIFO_RESET);\ndrivers/nfc/trf7970a.c-932-\t\t} else if ((status == TRF7970A_IRQ_STATUS_TX) ||\n--\ndrivers/nfc/trf7970a.c-935-\t\t\t\t\tTRF7970A_IRQ_STATUS_NFC_RF)))) {\ndrivers/nfc/trf7970a.c:936:\t\t\ttrf7970a_cmd(trf, TRF7970A_CMD_FIFO_RESET);\ndrivers/nfc/trf7970a.c-937-\n--\ndrivers/nfc/trf7970a.c-941-\t\t\t\ttrf-\u003erx_skb = ERR_PTR(0);\ndrivers/nfc/trf7970a.c:942:\t\t\t\ttrf7970a_send_upstream(trf);\ndrivers/nfc/trf7970a.c-943-\t\t\t\tbreak;\n--\ndrivers/nfc/trf7970a.c-962-\t\t\tcase NFC_DIGITAL_FRAMING_NFCA_ANTICOL_COMPLETE:\ndrivers/nfc/trf7970a.c:963:\t\t\t\tret = trf7970a_write(trf,\ndrivers/nfc/trf7970a.c-964-\t\t\t\t\t TRF7970A_SPECIAL_FCN_REG1,\n--\ndrivers/nfc/trf7970a.c-976-\t\t\tif (iso_ctrl != trf-\u003eiso_ctrl) {\ndrivers/nfc/trf7970a.c:977:\t\t\t\tret = trf7970a_update_iso_ctrl_register(trf, iso_ctrl);\ndrivers/nfc/trf7970a.c-978-\t\t\t\tif (ret)\n--\ndrivers/nfc/trf7970a.c-983-\t\t} else {\ndrivers/nfc/trf7970a.c:984:\t\t\ttrf7970a_send_err_upstream(trf, -EIO);\ndrivers/nfc/trf7970a.c-985-\t\t}\n--\ndrivers/nfc/trf7970a.c-988-\t\tif (status != TRF7970A_IRQ_STATUS_TX)\ndrivers/nfc/trf7970a.c:989:\t\t\ttrf7970a_send_err_upstream(trf, -EIO);\ndrivers/nfc/trf7970a.c-990-\t\tbreak;\n--\ndrivers/nfc/trf7970a.c-994-\t\t\t !cancel_delayed_work(\u0026trf-\u003etimeout_work);\ndrivers/nfc/trf7970a.c:995:\t\t\ttrf7970a_drain_fifo(trf, status);\ndrivers/nfc/trf7970a.c-996-\t\t} else if (!(status \u0026 TRF7970A_IRQ_STATUS_NFC_RF)) {\ndrivers/nfc/trf7970a.c:997:\t\t\ttrf7970a_send_err_upstream(trf, -EIO);\ndrivers/nfc/trf7970a.c-998-\t\t}\n--\ndrivers/nfc/trf7970a.c-1004-\ndrivers/nfc/trf7970a.c:1005:\t\t\tret = trf7970a_mode_detect(trf, \u0026trf-\u003emd_rf_tech);\ndrivers/nfc/trf7970a.c-1006-\t\t\tif (ret) {\ndrivers/nfc/trf7970a.c:1007:\t\t\t\ttrf7970a_send_err_upstream(trf, ret);\ndrivers/nfc/trf7970a.c-1008-\t\t\t} else {\ndrivers/nfc/trf7970a.c-1009-\t\t\t\ttrf-\u003estate = TRF7970A_ST_LISTENING;\ndrivers/nfc/trf7970a.c:1010:\t\t\t\ttrf7970a_drain_fifo(trf, status);\ndrivers/nfc/trf7970a.c-1011-\t\t\t}\ndrivers/nfc/trf7970a.c-1012-\t\t} else if (!(status \u0026 TRF7970A_IRQ_STATUS_NFC_RF)) {\ndrivers/nfc/trf7970a.c:1013:\t\t\ttrf7970a_send_err_upstream(trf, -EIO);\ndrivers/nfc/trf7970a.c-1014-\t\t}\n--\ndrivers/nfc/trf7970a.c-1025-\ndrivers/nfc/trf7970a.c:1026:static void trf7970a_issue_eof(struct trf7970a *trf)\ndrivers/nfc/trf7970a.c-1027-{\n--\ndrivers/nfc/trf7970a.c-1031-\ndrivers/nfc/trf7970a.c:1032:\tret = trf7970a_cmd(trf, TRF7970A_CMD_FIFO_RESET);\ndrivers/nfc/trf7970a.c-1033-\tif (ret)\ndrivers/nfc/trf7970a.c:1034:\t\ttrf7970a_send_err_upstream(trf, ret);\ndrivers/nfc/trf7970a.c-1035-\ndrivers/nfc/trf7970a.c:1036:\tret = trf7970a_cmd(trf, TRF7970A_CMD_EOF);\ndrivers/nfc/trf7970a.c-1037-\tif (ret)\ndrivers/nfc/trf7970a.c:1038:\t\ttrf7970a_send_err_upstream(trf, ret);\ndrivers/nfc/trf7970a.c-1039-\n--\ndrivers/nfc/trf7970a.c-1048-\ndrivers/nfc/trf7970a.c:1049:static void trf7970a_timeout_work_handler(struct work_struct *work)\ndrivers/nfc/trf7970a.c-1050-{\ndrivers/nfc/trf7970a.c:1051:\tstruct trf7970a *trf = container_of(work, struct trf7970a,\ndrivers/nfc/trf7970a.c-1052-\t\t\t\t\t timeout_work.work);\n--\ndrivers/nfc/trf7970a.c-1061-\telse if (trf-\u003estate == TRF7970A_ST_WAIT_FOR_RX_DATA_CONT)\ndrivers/nfc/trf7970a.c:1062:\t\ttrf7970a_drain_fifo(trf, TRF7970A_IRQ_STATUS_SRX);\ndrivers/nfc/trf7970a.c-1063-\telse if (trf-\u003estate == TRF7970A_ST_WAIT_TO_ISSUE_EOF)\ndrivers/nfc/trf7970a.c:1064:\t\ttrf7970a_issue_eof(trf);\ndrivers/nfc/trf7970a.c-1065-\telse\ndrivers/nfc/trf7970a.c:1066:\t\ttrf7970a_send_err_upstream(trf, -ETIMEDOUT);\ndrivers/nfc/trf7970a.c-1067-\n--\ndrivers/nfc/trf7970a.c-1070-\ndrivers/nfc/trf7970a.c:1071:static int trf7970a_init(struct trf7970a *trf)\ndrivers/nfc/trf7970a.c-1072-{\n--\ndrivers/nfc/trf7970a.c-1076-\ndrivers/nfc/trf7970a.c:1077:\tret = trf7970a_cmd(trf, TRF7970A_CMD_SOFT_INIT);\ndrivers/nfc/trf7970a.c-1078-\tif (ret)\n--\ndrivers/nfc/trf7970a.c-1081-\t/* Set the gain reduction after soft init */\ndrivers/nfc/trf7970a.c:1082:\tret = trf7970a_update_rx_gain_reduction(trf);\ndrivers/nfc/trf7970a.c-1083-\tif (ret)\n--\ndrivers/nfc/trf7970a.c-1085-\ndrivers/nfc/trf7970a.c:1086:\tret = trf7970a_cmd(trf, TRF7970A_CMD_IDLE);\ndrivers/nfc/trf7970a.c-1087-\tif (ret)\n--\ndrivers/nfc/trf7970a.c-1089-\ndrivers/nfc/trf7970a.c:1090:\tret = trf7970a_write(trf, TRF7970A_REG_IO_CTRL,\ndrivers/nfc/trf7970a.c-1091-\t\t\t trf-\u003eio_ctrl | TRF7970A_REG_IO_CTRL_VRS(0x1));\n--\ndrivers/nfc/trf7970a.c-1094-\ndrivers/nfc/trf7970a.c:1095:\tret = trf7970a_write(trf, TRF7970A_NFC_TARGET_LEVEL, 0);\ndrivers/nfc/trf7970a.c-1096-\tif (ret)\n--\ndrivers/nfc/trf7970a.c-1102-\ndrivers/nfc/trf7970a.c:1103:\tret = trf7970a_write(trf, TRF7970A_MODULATOR_SYS_CLK_CTRL,\ndrivers/nfc/trf7970a.c-1104-\t\t\t trf-\u003emodulator_sys_clk_ctrl);\n--\ndrivers/nfc/trf7970a.c-1107-\ndrivers/nfc/trf7970a.c:1108:\tret = trf7970a_write(trf, TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS,\ndrivers/nfc/trf7970a.c-1109-\t\t\t TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLH_96 |\n--\ndrivers/nfc/trf7970a.c-1113-\ndrivers/nfc/trf7970a.c:1114:\tret = trf7970a_write(trf, TRF7970A_SPECIAL_FCN_REG1, 0);\ndrivers/nfc/trf7970a.c-1115-\tif (ret)\n--\ndrivers/nfc/trf7970a.c-1127-\ndrivers/nfc/trf7970a.c:1128:static void trf7970a_switch_rf_off(struct trf7970a *trf)\ndrivers/nfc/trf7970a.c-1129-{\n--\ndrivers/nfc/trf7970a.c-1137-\ndrivers/nfc/trf7970a.c:1138:\ttrf7970a_write(trf, TRF7970A_CHIP_STATUS_CTRL, trf-\u003echip_status_ctrl);\ndrivers/nfc/trf7970a.c-1139-\n--\ndrivers/nfc/trf7970a.c-1146-\ndrivers/nfc/trf7970a.c:1147:static int trf7970a_switch_rf_on(struct trf7970a *trf)\ndrivers/nfc/trf7970a.c-1148-{\n--\ndrivers/nfc/trf7970a.c-1160-\ndrivers/nfc/trf7970a.c:1161:\tret = trf7970a_init(trf);\ndrivers/nfc/trf7970a.c-1162-\tif (ret) {\n--\ndrivers/nfc/trf7970a.c-1171-\ndrivers/nfc/trf7970a.c:1172:static int trf7970a_switch_rf(struct nfc_digital_dev *ddev, bool on)\ndrivers/nfc/trf7970a.c-1173-{\ndrivers/nfc/trf7970a.c:1174:\tstruct trf7970a *trf = nfc_digital_get_drvdata(ddev);\ndrivers/nfc/trf7970a.c-1175-\tint ret = 0;\n--\ndrivers/nfc/trf7970a.c-1184-\t\tcase TRF7970A_ST_RF_OFF:\ndrivers/nfc/trf7970a.c:1185:\t\t\tret = trf7970a_switch_rf_on(trf);\ndrivers/nfc/trf7970a.c-1186-\t\t\tbreak;\n--\ndrivers/nfc/trf7970a.c-1192-\t\t\t\t__func__, trf-\u003estate, on);\ndrivers/nfc/trf7970a.c:1193:\t\t\ttrf7970a_switch_rf_off(trf);\ndrivers/nfc/trf7970a.c-1194-\t\t\tret = -EINVAL;\n--\ndrivers/nfc/trf7970a.c-1209-\t\tcase TRF7970A_ST_WAIT_FOR_RX_DATA_CONT:\ndrivers/nfc/trf7970a.c:1210:\t\t\ttrf7970a_switch_rf_off(trf);\ndrivers/nfc/trf7970a.c-1211-\t\t}\n--\ndrivers/nfc/trf7970a.c-1217-\ndrivers/nfc/trf7970a.c:1218:static int trf7970a_in_config_rf_tech(struct trf7970a *trf, int tech)\ndrivers/nfc/trf7970a.c-1219-{\n--\ndrivers/nfc/trf7970a.c-1268-\t * PSL sequence (indicated by 'trf-\u003eiso_ctrl == 0xff' from\ndrivers/nfc/trf7970a.c:1269:\t * trf7970a_init()), clear the NFC Target Detection Level register\ndrivers/nfc/trf7970a.c-1270-\t * due to erratum.\n--\ndrivers/nfc/trf7970a.c-1272-\tif (trf-\u003eiso_ctrl == 0xff)\ndrivers/nfc/trf7970a.c:1273:\t\tret = trf7970a_write(trf, TRF7970A_NFC_TARGET_LEVEL, 0);\ndrivers/nfc/trf7970a.c-1274-\n--\ndrivers/nfc/trf7970a.c-1277-\ndrivers/nfc/trf7970a.c:1278:static int trf7970a_is_rf_field(struct trf7970a *trf, bool *is_rf_field)\ndrivers/nfc/trf7970a.c-1279-{\n--\ndrivers/nfc/trf7970a.c-1282-\ndrivers/nfc/trf7970a.c:1283:\tret = trf7970a_write(trf, TRF7970A_CHIP_STATUS_CTRL,\ndrivers/nfc/trf7970a.c-1284-\t\t\t trf-\u003echip_status_ctrl |\n--\ndrivers/nfc/trf7970a.c-1288-\ndrivers/nfc/trf7970a.c:1289:\tret = trf7970a_cmd(trf, TRF7970A_CMD_TEST_EXT_RF);\ndrivers/nfc/trf7970a.c-1290-\tif (ret)\n--\ndrivers/nfc/trf7970a.c-1294-\ndrivers/nfc/trf7970a.c:1295:\tret = trf7970a_read(trf, TRF7970A_RSSI_OSC_STATUS, \u0026rssi);\ndrivers/nfc/trf7970a.c-1296-\tif (ret)\n--\ndrivers/nfc/trf7970a.c-1298-\ndrivers/nfc/trf7970a.c:1299:\tret = trf7970a_write(trf, TRF7970A_CHIP_STATUS_CTRL,\ndrivers/nfc/trf7970a.c-1300-\t\t\t trf-\u003echip_status_ctrl);\n--\ndrivers/nfc/trf7970a.c-1311-\ndrivers/nfc/trf7970a.c:1312:static int trf7970a_in_config_framing(struct trf7970a *trf, int framing)\ndrivers/nfc/trf7970a.c-1313-{\n--\ndrivers/nfc/trf7970a.c-1350-\tif (!(trf-\u003echip_status_ctrl \u0026 TRF7970A_CHIP_STATUS_RF_ON)) {\ndrivers/nfc/trf7970a.c:1351:\t\tret = trf7970a_is_rf_field(trf, \u0026is_rf_field);\ndrivers/nfc/trf7970a.c-1352-\t\tif (ret)\n--\ndrivers/nfc/trf7970a.c-1359-\tif (iso_ctrl != trf-\u003eiso_ctrl) {\ndrivers/nfc/trf7970a.c:1360:\t\tret = trf7970a_update_iso_ctrl_register(trf, iso_ctrl);\ndrivers/nfc/trf7970a.c-1361-\t\tif (ret)\n--\ndrivers/nfc/trf7970a.c-1365-\ndrivers/nfc/trf7970a.c:1366:\t\tret = trf7970a_write(trf, TRF7970A_MODULATOR_SYS_CLK_CTRL,\ndrivers/nfc/trf7970a.c-1367-\t\t\t\t trf-\u003emodulator_sys_clk_ctrl);\n--\ndrivers/nfc/trf7970a.c-1372-\tif (!(trf-\u003echip_status_ctrl \u0026 TRF7970A_CHIP_STATUS_RF_ON)) {\ndrivers/nfc/trf7970a.c:1373:\t\tret = trf7970a_write(trf, TRF7970A_CHIP_STATUS_CTRL,\ndrivers/nfc/trf7970a.c-1374-\t\t\t\t trf-\u003echip_status_ctrl |\n--\ndrivers/nfc/trf7970a.c-1386-\ndrivers/nfc/trf7970a.c:1387:static int trf7970a_in_configure_hw(struct nfc_digital_dev *ddev, int type,\ndrivers/nfc/trf7970a.c-1388-\t\t\t\t int param)\ndrivers/nfc/trf7970a.c-1389-{\ndrivers/nfc/trf7970a.c:1390:\tstruct trf7970a *trf = nfc_digital_get_drvdata(ddev);\ndrivers/nfc/trf7970a.c-1391-\tint ret;\n--\ndrivers/nfc/trf7970a.c-1400-\t (trf-\u003estate == TRF7970A_ST_RF_OFF)) {\ndrivers/nfc/trf7970a.c:1401:\t\tret = trf7970a_switch_rf_on(trf);\ndrivers/nfc/trf7970a.c-1402-\t\tif (ret)\n--\ndrivers/nfc/trf7970a.c-1407-\tcase NFC_DIGITAL_CONFIG_RF_TECH:\ndrivers/nfc/trf7970a.c:1408:\t\tret = trf7970a_in_config_rf_tech(trf, param);\ndrivers/nfc/trf7970a.c-1409-\t\tbreak;\ndrivers/nfc/trf7970a.c-1410-\tcase NFC_DIGITAL_CONFIG_FRAMING:\ndrivers/nfc/trf7970a.c:1411:\t\tret = trf7970a_in_config_framing(trf, param);\ndrivers/nfc/trf7970a.c-1412-\t\tbreak;\n--\ndrivers/nfc/trf7970a.c-1422-\ndrivers/nfc/trf7970a.c:1423:static int trf7970a_is_iso15693_write_or_lock(u8 cmd)\ndrivers/nfc/trf7970a.c-1424-{\n--\ndrivers/nfc/trf7970a.c-1438-\ndrivers/nfc/trf7970a.c:1439:static int trf7970a_per_cmd_config(struct trf7970a *trf,\ndrivers/nfc/trf7970a.c-1440-\t\t\t\t const struct sk_buff *skb)\n--\ndrivers/nfc/trf7970a.c-1464-\t\tif (special_fcn_reg1 != trf-\u003especial_fcn_reg1) {\ndrivers/nfc/trf7970a.c:1465:\t\t\tret = trf7970a_write(trf, TRF7970A_SPECIAL_FCN_REG1,\ndrivers/nfc/trf7970a.c-1466-\t\t\t\t\t special_fcn_reg1);\n--\ndrivers/nfc/trf7970a.c-1491-\t\tif (iso_ctrl != trf-\u003eiso_ctrl) {\ndrivers/nfc/trf7970a.c:1492:\t\t\tret = trf7970a_update_iso_ctrl_register(trf, iso_ctrl);\ndrivers/nfc/trf7970a.c-1493-\t\t\tif (ret)\n--\ndrivers/nfc/trf7970a.c-1499-\t\tif ((trf-\u003eframing == NFC_DIGITAL_FRAMING_ISO15693_T5T) \u0026\u0026\ndrivers/nfc/trf7970a.c:1500:\t\t trf7970a_is_iso15693_write_or_lock(req[1]) \u0026\u0026\ndrivers/nfc/trf7970a.c-1501-\t\t (req[0] \u0026 ISO15693_REQ_FLAG_OPTION))\n--\ndrivers/nfc/trf7970a.c-1507-\ndrivers/nfc/trf7970a.c:1508:static int trf7970a_send_cmd(struct nfc_digital_dev *ddev,\ndrivers/nfc/trf7970a.c-1509-\t\t\t struct sk_buff *skb, u16 timeout,\n--\ndrivers/nfc/trf7970a.c-1511-{\ndrivers/nfc/trf7970a.c:1512:\tstruct trf7970a *trf = nfc_digital_get_drvdata(ddev);\n\n"
} |
| 7/2 | 2026/07/28 22:34 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 30592 output: 23 thoughts: 191 Thoughts: **Investigating the Feasibility of Testing a Specific Hardware Driver** Okay, so I've stumbled upon `Documentation/devicetree/bindings/net/nfc/ti,trf7970a.yaml` and `arch/arm/boot/dts/nxp/imx/imx6dl-prtrvt.dts`. This is a real, bona fide hardware device driver – the TI TRF7970A NFC controller. The key question now is, can I even *reach* this thing within a QEMU environment? Unfortunately, QEMU doesn't seem to have emulation for the TRF7970A. Darn. So, is there any way to instantiate it without direct hardware, maybe via sysfs or something clever? Given that it's an SPI device, sysfs *might* offer a path, but the reality is it would still need to communicate with a *real* SPI controller on the simulated side. That seems unlikely. Wait a second, thinking about how syzkaller handles things... It has `vhci` for USB, and `mac80211_hwsim` for WiFi. So the question is, does syzkaller have an SPI equivalent, something like a dummy controller? That would be ideal. Let's see if there is any SPI dummy driver available within the kernel or syzkaller. Time to check! |
| 8/2 | 2026/07/28 22:34 | tool | grepper |
0mError:no matches Args: {
"Expression": "spi-mock",
"PathPrefix": ""
}Results: {
"error": "no matches"
} |
| 9/2 | 2026/07/28 22:34 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 31120 output: 23 thoughts: 16 Thoughts: Here's my thought process, summarized as you requested: **Considering SPI Testing Strategies** Okay, let's think about the best way to approach this. I need to figure out which SPI test configuration to use. Should I start with `spi-dummy`? That's a classic for getting things going, a low-hanging fruit, so to speak. It's great for initial bring-up and sanity checks. Or maybe `spi-loopback` is the better choice? I'm leaning towards `spi-loopback` as that offers a more controlled environment where I'm testing the TX/RX path, which is valuable. Ultimately, it depends on what I'm trying to validate. I'll take a minute to think through the priorities for this specific test case. |
| 10/2 | 2026/07/28 22:34 | tool | grepper |
0mError:no matches Args: {
"Expression": "spi-dummy",
"PathPrefix": ""
}Results: {
"error": "no matches"
} |
| 11/2 | 2026/07/28 22:34 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 31339 output: 24 thoughts: 10 Thoughts: Okay, here's my attempt at summarizing that thought process, keeping in mind I'm speaking to a fellow expert: **Investigating the SPI Loopback Test** Alright, time to get to it. Let's see what we've got in that `spi-loopback` test. I want to dive into this now and get a better understanding of what's happening. I need to make sure this critical element is working as it should, so I'm going to carefully analyze what's happening in there. |
| 12/2 | 2026/07/28 22:34 | tool | grepper |
0mArgs:{
"Expression": "spi-loopback",
"PathPrefix": ""
}Results: {
"Output": "Documentation/devicetree/bindings/incomplete-devices.yaml=26=properties:\n--\nDocumentation/devicetree/bindings/incomplete-devices.yaml-245- - gpio-virtuser\nDocumentation/devicetree/bindings/incomplete-devices.yaml:246: - linux,spi-loopback-test\nDocumentation/devicetree/bindings/incomplete-devices.yaml-247- - mailbox-test\n--\ndrivers/spi/Makefile=14=obj-$(CONFIG_SPI_SPIDEV)\t\t+= spidev.o\ndrivers/spi/Makefile:15:obj-$(CONFIG_SPI_LOOPBACK_TEST)\t\t+= spi-loopback-test.o\ndrivers/spi/Makefile-16-\n--\ndrivers/spi/spi-loopback-test.c-2-/*\ndrivers/spi/spi-loopback-test.c:3: * linux/drivers/spi/spi-loopback-test.c\ndrivers/spi/spi-loopback-test.c-4- *\n--\ndrivers/spi/spi-loopback-test.c=357=static int spi_loopback_test_probe(struct spi_device *spi)\n--\ndrivers/spi/spi-loopback-test.c-371-\ndrivers/spi/spi-loopback-test.c:372:\tdev_info(\u0026spi-\u003edev, \"Executing spi-loopback-tests\\n\");\ndrivers/spi/spi-loopback-test.c-373-\n--\ndrivers/spi/spi-loopback-test.c-375-\ndrivers/spi/spi-loopback-test.c:376:\tdev_info(\u0026spi-\u003edev, \"Finished spi-loopback-tests with return: %i\\n\",\ndrivers/spi/spi-loopback-test.c-377-\t\t ret);\n--\ndrivers/spi/spi-loopback-test.c=383=static struct of_device_id spi_loopback_test_of_match[] = {\ndrivers/spi/spi-loopback-test.c:384:\t{ .compatible\t= \"linux,spi-loopback-test\", },\ndrivers/spi/spi-loopback-test.c-385-\t{ }\n--\ndrivers/spi/spi-loopback-test.c=395=static struct spi_driver spi_loopback_test_driver = {\ndrivers/spi/spi-loopback-test.c-396-\t.driver = {\ndrivers/spi/spi-loopback-test.c:397:\t\t.name = \"spi-loopback-test\",\ndrivers/spi/spi-loopback-test.c-398-\t\t.of_match_table = spi_loopback_test_of_match,\n"
} |
| 13/2 | 2026/07/28 22:34 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 32158 output: 22 thoughts: 143 Thoughts: **My Assessment of SPI Device Accessibility in Syzkaller** Okay, so here's the deal with SPI devices in syzkaller. From my understanding, they're generally off-limits unless we're dealing with a *specific* virtual SPI controller that syzkaller is familiar with. And even if we *do* have that virtual controller, syzkaller needs a way to instantiate the particular SPI device. That usually means device tree overlays, which syzkaller doesn't handle dynamically for just any device, or some sysfs interface, which is unlikely to exist. Hmm, wait... is there something like a `spi-mock` or `spi-dummy`? Nope, after a quick memory check, I don't recall seeing anything like that. Ah, the `spi-loopback-test` exists, but that's just a test *driver* – not a controller, so it's irrelevant. Alright, let's get serious. I need to figure out if we actually have any virtual SPI controllers available. I'll need to go digging in the `drivers/spi/` directory. Maybe `spi-mock.c` or something similar will hold the key. |
| 14/2 | 2026/07/28 22:35 | tool | grepper |
0mError:no matches Args: {
"Expression": "virtual SPI",
"PathPrefix": ""
}Results: {
"error": "no matches"
} |
| 15/2 | 2026/07/28 22:35 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 32588 output: 23 thoughts: 26 Thoughts: Okay, here's my take on those thoughts, framed as a first-person expert summary: **Digging into SPI Driver Simulation** Alright, so I need to get a handle on how we're handling SPI devices in a simulated or test environment. My first instinct, given my experience, is to zero in on the core driver files. Specifically, I want to look at `drivers/spi/spi-*.c`. The wildcard there is crucial, as it will sweep across all the SPI driver source files in that directory. I figure that's where any abstractions or virtualizations related to the SPI interface are most likely to be implemented. The key terms I'm mentally searching for are: `mock`, `dummy`, and `virt`. These are the keywords I'd expect to see used when creating an SPI implementation that isn't tied to a specific physical hardware device. `mock` would suggest a controlled simulation, `dummy` a minimal placeholder, and `virt` or `virtual` could signify a more complex, perhaps software-defined, SPI bus model. It is important to know which methodology is being used for development purposes, and to identify that methodology. |
| 16/2 | 2026/07/28 22:35 | tool | grepper |
0mArgs:{
"Expression": "spi-virt",
"PathPrefix": ""
}Results: {
"Output": "MAINTAINERS=28720=S:\tMaintained\nMAINTAINERS:28721:F:\tdrivers/spi/spi-virtio.c\nMAINTAINERS-28722-F:\tinclude/uapi/linux/virtio_spi.h\n--\ndrivers/spi/Kconfig=1261=config SPI_VIRTIO\n--\ndrivers/spi/Kconfig-1269-\t This driver can also be built as a module. If so, the module\ndrivers/spi/Kconfig:1270:\t will be called spi-virtio.\ndrivers/spi/Kconfig-1271-\n--\ndrivers/spi/Makefile=165=obj-$(CONFIG_SPI_UNIPHIER)\t\t+= spi-uniphier.o\ndrivers/spi/Makefile:166:obj-$(CONFIG_SPI_VIRTIO)\t\t+= spi-virtio.o\ndrivers/spi/Makefile-167-obj-$(CONFIG_SPI_XCOMM)\t\t+= spi-xcomm.o\n"
} |
| 17/2 | 2026/07/28 22:35 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 33144 output: 27 thoughts: 227 Thoughts: **My Assessment of the Virtio SPI Controller and its Integration Challenges** Okay, so I'm looking at `spi-virtio.c`. This appears to be a virtio SPI controller implementation. The idea is sound – if QEMU had a virtio-spi device, it could essentially simulate an SPI bus. But here's the rub: as far as I know, QEMU either doesn't support virtio-spi, or if it does, syzkaller, which is what I'm dealing with, lacks the mechanism to actually spin up an SPI device on that simulated bus. The problem boils down to device instantiation. Syzkaller needs a way to tell the kernel, essentially, "Hey, there's a `trf7970a` chip on this SPI bus." Normally, that's handled through Device Tree or ACPI. But because syzkaller runs with a fixed QEMU configuration, including a static DTB/ACPI, dynamically adding this `trf7970a` is simply not possible. It's a closed environment. Wait, though... is there a potential workaround? Can SPI devices be instantiated from userspace? I seem to recall something about `spi_board_info` and sysfs. Now I'm checking if there's an I2C-like `new_device` equivalent for SPI. Ah, no. There isn't a generic sysfs interface for SPI devices like the one used for I2C devices (`new_device`). That seems to be a dead end for this particular route. |
| 18/2 | 2026/07/28 22:35 | tool | grepper |
0mArgs:{
"Expression": "new_device",
"PathPrefix": "drivers/spi/"
}Results: {
"Output": "drivers/spi/spi-altera-dfl.c=124=static int dfl_spi_altera_probe(struct dfl_device *dfl_dev)\n--\ndrivers/spi/spi-altera-dfl.c-174-\ndrivers/spi/spi-altera-dfl.c:175:\tif (!spi_new_device(host, \u0026board_info)) {\ndrivers/spi/spi-altera-dfl.c-176-\t\tdev_err(dev, \"%s failed to create SPI device: %s\\n\",\n--\ndrivers/spi/spi-altera-platform.c=35=static int altera_spi_probe(struct platform_device *pdev)\n--\ndrivers/spi/spi-altera-platform.c-119-\t\tfor (i = 0; i \u003c pdata-\u003enum_devices; i++) {\ndrivers/spi/spi-altera-platform.c:120:\t\t\tif (!spi_new_device(host, pdata-\u003edevices + i))\ndrivers/spi/spi-altera-platform.c-121-\t\t\t\tdev_warn(\u0026pdev-\u003edev,\n--\ndrivers/spi/spi-butterfly.c=176=static void butterfly_attach(struct parport *p)\n--\ndrivers/spi/spi-butterfly.c-265-\tpp-\u003einfo[0].controller_data = pp;\ndrivers/spi/spi-butterfly.c:266:\tpp-\u003edataflash = spi_new_device(pp-\u003ebitbang.ctlr, \u0026pp-\u003einfo[0]);\ndrivers/spi/spi-butterfly.c-267-\tif (pp-\u003edataflash)\n--\ndrivers/spi/spi-ch341.c=141=static int ch341_probe(struct usb_interface *intf,\n--\ndrivers/spi/spi-ch341.c-206-\ndrivers/spi/spi-ch341.c:207:\tch341-\u003espidev = spi_new_device(ctrl, \u0026chip);\ndrivers/spi/spi-ch341.c-208-\tif (!ch341-\u003espidev) {\n--\ndrivers/spi/spi-cs42l43.c=312=static int cs42l43_spi_probe(struct platform_device *pdev)\n--\ndrivers/spi/spi-cs42l43.c-426-\ndrivers/spi/spi-cs42l43.c:427:\t\tif (!spi_new_device(priv-\u003ectlr, ampl_info))\ndrivers/spi/spi-cs42l43.c-428-\t\t\treturn dev_err_probe(priv-\u003edev, -ENODEV,\n--\ndrivers/spi/spi-cs42l43.c-430-\ndrivers/spi/spi-cs42l43.c:431:\t\tif (!spi_new_device(priv-\u003ectlr, ampr_info))\ndrivers/spi/spi-cs42l43.c-432-\t\t\treturn dev_err_probe(priv-\u003edev, -ENODEV,\n--\ndrivers/spi/spi-intel.c=1375=static int intel_spi_populate_chip(struct intel_spi *ispi)\n--\ndrivers/spi/spi-intel.c-1401-\ndrivers/spi/spi-intel.c:1402:\tif (!spi_new_device(ispi-\u003ehost, \u0026chip))\ndrivers/spi/spi-intel.c-1403-\t\treturn -ENODEV;\n--\ndrivers/spi/spi-intel.c-1430-\ndrivers/spi/spi-intel.c:1431:\tif (!spi_new_device(ispi-\u003ehost, \u0026chip))\ndrivers/spi/spi-intel.c-1432-\t\treturn -ENODEV;\n--\ndrivers/spi/spi-kspi2.c=310=static int kspi2_register_devices(struct kspi2 *kspi)\n--\ndrivers/spi/spi-kspi2.c-316-\tfor (i = 0; i \u003c kspi-\u003eauxdev-\u003einfo_size; i++) {\ndrivers/spi/spi-kspi2.c:317:\t\tstruct spi_device *device = spi_new_device(kspi-\u003ehost, \u0026info[i]);\ndrivers/spi/spi-kspi2.c-318-\n--\ndrivers/spi/spi-lm70llp.c=188=static void spi_lm70llp_attach(struct parport *p)\n--\ndrivers/spi/spi-lm70llp.c-266-\tpp-\u003einfo.controller_data = pp;\ndrivers/spi/spi-lm70llp.c:267:\tpp-\u003espidev_lm70 = spi_new_device(pp-\u003ebitbang.ctlr, \u0026pp-\u003einfo);\ndrivers/spi/spi-lm70llp.c-268-\tif (pp-\u003espidev_lm70)\n--\ndrivers/spi/spi-lm70llp.c-271-\telse {\ndrivers/spi/spi-lm70llp.c:272:\t\tdev_warn(\u0026pd-\u003edev, \"spi_new_device failed\\n\");\ndrivers/spi/spi-lm70llp.c-273-\t\tstatus = -ENODEV;\n--\ndrivers/spi/spi-xilinx.c=402=static int xilinx_spi_probe(struct platform_device *pdev)\n--\ndrivers/spi/spi-xilinx.c-509-\t\tfor (i = 0; i \u003c pdata-\u003enum_devices; i++)\ndrivers/spi/spi-xilinx.c:510:\t\t\tspi_new_device(host, pdata-\u003edevices + i);\ndrivers/spi/spi-xilinx.c-511-\t}\n--\ndrivers/spi/spi.c=791=EXPORT_SYMBOL_GPL(spi_add_device);\n--\ndrivers/spi/spi.c-793-/**\ndrivers/spi/spi.c:794: * spi_new_device - instantiate one new SPI device\ndrivers/spi/spi.c-795- * @ctlr: Controller to which device is connected\n--\ndrivers/spi/spi.c-806- */\ndrivers/spi/spi.c:807:struct spi_device *spi_new_device(struct spi_controller *ctlr,\ndrivers/spi/spi.c-808-\t\t\t\t struct spi_board_info *chip)\n--\ndrivers/spi/spi.c-862-}\ndrivers/spi/spi.c:863:EXPORT_SYMBOL_GPL(spi_new_device);\ndrivers/spi/spi.c-864-\n--\ndrivers/spi/spi.c=893=static void spi_match_controller_to_boardinfo(struct spi_controller *ctlr,\n--\ndrivers/spi/spi.c-900-\ndrivers/spi/spi.c:901:\tdev = spi_new_device(ctlr, bi);\ndrivers/spi/spi.c-902-\tif (!dev)\n"
} |
| 19/2 | 2026/07/28 22:35 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 35510 output: 39 thoughts: 152 Thoughts: **SPI Device Instantiation Conundrum** Okay, so I'm hitting a roadblock. I was hoping to leverage sysfs's `new_device` entry to conjure up a test SPI device, but it looks like that's a dead end. Damn. Wait a minute…I thought syzkaller had some kind of sleight of hand for this. I recall it using `i2c_new_client_device` for I2C injection? No, no, that's not right. It relies on `vhci`, `mac80211_hwsim`, and `hci_vhci` for USB, WiFi, and Bluetooth respectively. Each of these have virtual device drivers. But for SPI...there's nothing analogous, is there? No clean way to instantiate an arbitrary SPI device using syzkaller's existing infrastructure. Hmm. Perhaps I can try and be creative. The `trf7970a` driver... that could provide some basis for testing. Although, if I recall, it is using SPI, which would seem to not help me. Okay, I'm going to double check it again at `drivers/nfc/trf7970a.c` to see if there is any option I can use. |
| 20/2 | 2026/07/28 22:35 | tool | grepper |
0mError:no matches Args: {
"Expression": "spi_register_driver",
"PathPrefix": "drivers/nfc/trf7970a.c"
}Results: {
"error": "no matches"
} |
| 21/2 | 2026/07/28 22:35 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 35986 output: 39 thoughts: 10 Thoughts: Okay, here's my attempt at summarizing that thought process, keeping in mind I'm speaking to an expert: **Driver Registration Check** Alright, let's just make sure we're on the same page. Before we go any further, I need to verify how this driver has been registered within the system. We've got a lot riding on its successful implementation, so let's check its status, dependencies, and any potential conflicts. This is a crucial first step; we need to eliminate any fundamental issues before moving forward. Let me see where we can check this information and ensure everything is set up correctly. Is the driver present? Has the kernel recognized the driver? Are the modules loaded? Let's verify that quickly and make sure it's all configured as expected. |
| 22/2 | 2026/07/28 22:35 | tool | grepper |
0mArgs:{
"Expression": "module_spi_driver",
"PathPrefix": "drivers/nfc/trf7970a.c"
}Results: {
"Output": "drivers/nfc/trf7970a.c=2321=static struct spi_driver trf7970a_spi_driver = {\n--\ndrivers/nfc/trf7970a.c-2331-\ndrivers/nfc/trf7970a.c:2332:module_spi_driver(trf7970a_spi_driver);\ndrivers/nfc/trf7970a.c-2333-\n"
} |
| 23/2 | 2026/07/28 22:35 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 36333 output: 24 thoughts: 86 Thoughts: **Analyzing the SPI Driver's Reachability in Syzkaller** Okay, so I'm looking at this code and, yep, it's definitely an SPI driver. The key problem here is that, as things stand, there isn't a virtual SPI controller implemented within syzkaller's environment. And because of that, this particular piece of driver code isn't going to be reachable in any of the typical virtualized environments like GCE or QEMU that syzkaller uses. Effectively, it's dead code from a fuzzing perspective, which is a significant limitation. Wait, though… I vaguely recall seeing something about SPI support being added to syzkaller recently. Let me just double-check that. I need to see if there's been any introduction of a `syz_spi` pseudo-syscall, or something similar. If there *is* a new syscall, then the situation changes drastically, and I need to re-evaluate the reachability. I better go look into this. |
| 24/2 | 2026/07/28 22:35 | tool | grepper |
0mError:no matches Args: {
"Expression": "syz_spi",
"PathPrefix": ""
}Results: {
"error": "no matches"
} |
| 25/2 | 2026/07/28 22:35 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 36670 output: 25 thoughts: 18 Thoughts: Okay, here's my summary, presented as a stream of thought: **Checking for SPI-Related Pseudo-Syscalls** Right, let's get down to brass tacks. I need to figure out how this system handles SPI communication, if at all. My initial step is always to see if there are any pseudo-system calls, or perhaps user-level library functions that mimic the behavior of system calls. The core of my investigation starts here. I'm specifically looking for anything that might be tagged with `spi`. My mental checklist includes searching documentation, header files, and relevant source code for any signs of this. I expect these pseudo-calls will allow interaction with the SPI bus at a lower level for performance or specific control needs, and I'm eager to find them. |
| 26/2 | 2026/07/28 22:35 | tool | grepper |
0mError:no matches Args: {
"Expression": "syz_.*spi",
"PathPrefix": ""
}Results: {
"error": "no matches"
} |
| 27/2 | 2026/07/28 22:35 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 36891 output: 108 thoughts: 621 Thoughts: **My Assessment: WorthFuzzing=false for TRF7970A SPI Driver** Okay, first things first, I need to figure out if this code is actually fuzzable. I initially thought about using `read-file` or `codesearch-dir-index` to look for syzlang descriptions for SPI-related stuff, but then the prompt hits me: I can't look for `syz_` calls. Right, that's because those are syzkaller pseudo-syscalls and not actually in the kernel. So, scratch that. Instead, I have to think about instantiation. Can this SPI controller, specifically `trf7970a`, actually *be* instantiated? I know SPI drivers need an SPI device registered on an SPI bus. And here's the kicker: in QEMU, unless we're using a specific machine type *that* has this device, it's just not going to get probed. Syzkaller usually uses `q35` or `pc` machine types for x86, or `virt` for ARM, and none of those have the necessary SPI device. So, the `trf7970a_probe` function is essentially unreachable. Let me just double check. Can I probe this another way? Could it be via a Device Tree overlay? Nope, Syzkaller doesn't support arbitrary Device Tree overlays (at least not yet). How about some other subsystem? No, it's a strictly SPI driver. So, no go. It's unreachable. Okay, back to the prompt. It clearly states to return `WorthFuzzing=false` if the patch contains: code paths that are impossible to reach in virtualized environments. This SPI driver is for a specific hardware chip, the TRF7970A RFID/NFC transceiver. There's no software-emulated hardware in QEMU or the kernel that can instantiate arbitrary SPI devices from userspace, like a dummy SPI controller. So, it's impossible to reach in a virtualized environment. That's a clear fit for the rule. Just to be absolutely sure, let me quickly glance around for anything related to NFC or similar things that *could* somehow trigger this. Ah, `nfcsim` comes to mind. But, nope. `nfcsim` is a virtual NFC device, but it does *not* use `trf7970a.c`. The `trf7970a.c` file is *specifically* for the TI TRF7970A chip, and it's connected via SPI. Therefore, given the hardware dependency and the inability to reach this code in a standard virtualized environment, I'm going to set `WorthFuzzing=false` with the reasoning that it's a hardware-specific SPI driver and is unreachable. |
| 28/2 | 2026/07/28 22:35 | tool | set-results |
0mArgs:{
"EnableConfigs": [],
"FocusSymbols": [],
"Reasoning": "The patch modifies `trf7970a.c`, which is a hardware-specific SPI driver for the Texas Instruments TRF7970A RFID/NFC transceiver. Since there is no virtual SPI controller or software emulation for this specific hardware in standard QEMU/virtualized environments, the driver cannot be probed and the code is unreachable during fuzzing.",
"WorthFuzzing": false
}Results: {
"EnableConfigs": null,
"FocusSymbols": [],
"Reasoning": "The patch modifies `trf7970a.c`, which is a hardware-specific SPI driver for the Texas Instruments TRF7970A RFID/NFC transceiver. Since there is no virtual SPI controller or software emulation for this specific hardware in standard QEMU/virtualized environments, the driver cannot be probed and the code is unreachable during fuzzing.",
"WorthFuzzing": false
} |
| Total Calls | Total Tokens | Avg Tokens | Total Duration (Seconds) | Avg Duration (Seconds) |
|---|
| Total Calls | Total Duration (Seconds) | Avg Duration (Seconds) |
|---|