bes2600: thread struct device * through factory request_firmware() call

Follow-up to \"bes2600: use request_firmware() for factory.txt read\".
That patch switched the factory calibration read path from filp_open()
+ kernel_read() to request_firmware(), but passed dev=NULL to
request_firmware() because factory_section_read_file() did not have a
struct device * in scope. The resulting logs carry the
'(NULL device *):' prefix and do not propagate a udev association.

Add a module-local static struct device * used as the firmware-class
load context, plus a small exported setter:

    static struct device *bes2600_factory_dev;
    void bes2600_factory_set_dev(struct device *dev);

Wire bes2600_factory_set_dev(&func->dev) from bes2600_sdio_probe(),
right after bes2600_platform_data_init() so the platform layer has
already had a chance to use the same struct device for its own
initialization.

factory_section_read_file() now passes bes2600_factory_dev (instead
of NULL) to request_firmware(). When the factory read happens before
probe (not currently the case on PineTab2) the pointer is still NULL
and request_firmware() accepts that; no regression.

No API changes to bes2600_get_factory_cali_data() callers. The
char *path parameter remains (it is the firmware-class name fed
straight to request_firmware()).

Tested-on: PineTab2 (BES2600WM + RK3566) running linux-pinetab2
6.19.10-danctnix1-1. Driver probes, factory data is read, and any
post-c5 factory diagnostics now carry the SDIO device identity
instead of '(NULL device *)'.

Signed-off-by: Markus Fritsche <fritsche.markus@gmail.com>

bes2600/bes2600_factory.c

@@ -31,6 +31,18 @@
 
 static DEFINE_MUTEX(factory_lock);
 
+/*
+ * struct device * for request_firmware() context. Set once at SDIO
+ * probe via bes2600_factory_set_dev(). NULL is tolerated (falls back
+ * to the udev-less firmware-class path) but loses per-device logging.
+ */
+static struct device *bes2600_factory_dev;
+
+void bes2600_factory_set_dev(struct device *dev)
+{
+	bes2600_factory_dev = dev;
+}
+
 /*
  * It is only used for temporary storage.
  * Every time get the factory, it will read from the
@@ -148,7 +160,7 @@ static int factory_section_read_file(char *path, void *buffer)
 
 	bes_devel("requesting firmware-class %s\n", path);
 
-	ret = request_firmware(&fw, path, NULL);
+	ret = request_firmware(&fw, path, bes2600_factory_dev);
 	if (ret) {
 		bes_devel("BES2600: request_firmware(%s) failed: %d\n", path, ret);
 		return -1;

bes2600/bes2600_factory.h

@@ -199,6 +199,9 @@ enum factory_cali_status {
 /* just calibrate 11n, other protocols are automatically mapped */
 #define WIFI_RF_11N_MODE 0x15
 
+/* set the struct device * used for request_firmware() context */
+void bes2600_factory_set_dev(struct device *dev);
+
 /* read wifi & bt factory cali value*/
 u8* bes2600_get_factory_cali_data(u8 *file_buffer, u32 *data_len, char *path);
 void factory_little_endian_cvrt(u8 *data);

bes2600/bes2600_sdio.c

@@ -30,6 +30,7 @@
 #include "bes2600.h"
 #include "sbus.h"
 #include "bes2600_plat.h"
+#include "bes2600_factory.h"
 #include "hwio.h"
 #include "bes_chardev.h"
 #include "bes_log.h"
@@ -1834,6 +1835,9 @@ static int bes2600_sdio_probe(struct sdio_func *func,
 	if (ret)
 		goto err;
 
+	/* wire struct device into factory.c for request_firmware() context */
+	bes2600_factory_set_dev(dev);
+
 	self->pdata = bes2600_get_platform_data();
 	self->func = func;
 	self->dev = &func->dev;