Staging: comedi: usbdux[fast] firmware upload changes

usbdux and usbduxfast upload now their firmware via the firmware kernel
meachanism. No udev rules are needed for that except the default ones.
The firmware will usually be loaded from /lib/firmware. Upload via
comedi_config is still possible for static comedi devices
(comedi_num_legacy_minors>0).

Frank, thanks for the example code which sped up rewriting of the code
substantially.

From: Bernd Porr <BerndPorr@f2s.com>
Cc: Ian Abbott <abbotti@mev.co.uk>
Cc: Frank Mori Hess <fmhess@users.sourceforge.net>
Cc: David Schleef <ds@schleef.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/comedi/drivers/usbdux.c

-#define DRIVER_VERSION "v2.1"
+#define DRIVER_VERSION "v2.2"
 #define DRIVER_AUTHOR "Bernd Porr, BerndPorr@f2s.com"
 #define DRIVER_DESC "Stirling/ITL USB-DUX -- Bernd.Porr@f2s.com"
 /*
@@ -25,8 +25,8 @@ Driver: usbdux
 Description: University of Stirling USB DAQ & INCITE Technology Limited
 Devices: [ITL] USB-DUX (usbdux.o)
 Author: Bernd Porr <BerndPorr@f2s.com>
-Updated: 25 Nov 2007
-Status: Testing
+Updated: 8 Dec 2008
+Status: Stable
 Configuration options:
   You have to upload firmware with the -i option. The
   firmware is usually installed under /usr/share/usb or
@@ -79,6 +79,7 @@ sampling rate. If you sample two channels you get 4kHz and so on.
  * 1.2:  added PWM suport via EP4
  * 2.0:  PWM seems to be stable and is not interfering with the other functions
  * 2.1:  changed PWM API
+ * 2.2:  added firmware kernel request to fix an udev problem
  *
  */
 
@@ -94,6 +95,7 @@ sampling rate. If you sample two channels you get 4kHz and so on.
 #include <linux/smp_lock.h>
 #include <linux/fcntl.h>
 #include <linux/compiler.h>
+#include <linux/firmware.h>
 
 #include "../comedidev.h"
 
@@ -718,31 +720,29 @@ static int usbduxsub_start(struct usbduxsub *usbduxsub)
 	int errcode = 0;
 	uint8_t local_transfer_buffer[16];
 
-	if (usbduxsub->probed) {
-		/* 7f92 to zero */
-		local_transfer_buffer[0] = 0;
-		errcode = usb_control_msg(usbduxsub->usbdev,
-			/* create a pipe for a control transfer */
-			usb_sndctrlpipe(usbduxsub->usbdev, 0),
-			/* bRequest, "Firmware" */
-			USBDUXSUB_FIRMWARE,
-			/* bmRequestType */
-			VENDOR_DIR_OUT,
-			/* Value */
-			USBDUXSUB_CPUCS,
-			/* Index */
-			0x0000,
-			/* address of the transfer buffer */
-			local_transfer_buffer,
-			/* Length */
-			1,
-			/* Timeout */
-			EZTIMEOUT);
-		if (errcode < 0) {
-			dev_err(&usbduxsub->interface->dev,
-				"comedi_: control msg failed (start)\n");
-			return errcode;
-		}
+	/* 7f92 to zero */
+	local_transfer_buffer[0] = 0;
+	errcode = usb_control_msg(usbduxsub->usbdev,
+				  /* create a pipe for a control transfer */
+				  usb_sndctrlpipe(usbduxsub->usbdev, 0),
+				  /* bRequest, "Firmware" */
+				  USBDUXSUB_FIRMWARE,
+				  /* bmRequestType */
+				  VENDOR_DIR_OUT,
+				  /* Value */
+				  USBDUXSUB_CPUCS,
+				  /* Index */
+				  0x0000,
+				  /* address of the transfer buffer */
+				  local_transfer_buffer,
+				  /* Length */
+				  1,
+				  /* Timeout */
+				  EZTIMEOUT);
+	if (errcode < 0) {
+		dev_err(&usbduxsub->interface->dev,
+			"comedi_: control msg failed (start)\n");
+		return errcode;
 	}
 	return 0;
 }
@@ -752,28 +752,27 @@ static int usbduxsub_stop(struct usbduxsub *usbduxsub)
 	int errcode = 0;
 
 	uint8_t local_transfer_buffer[16];
-	if (usbduxsub->probed) {
-		/* 7f92 to one */
-		local_transfer_buffer[0] = 1;
-		errcode = usb_control_msg(usbduxsub->usbdev,
-			usb_sndctrlpipe(usbduxsub->usbdev, 0),
-			/* bRequest, "Firmware" */
-			USBDUXSUB_FIRMWARE,
-			/* bmRequestType */
-			VENDOR_DIR_OUT,
-			/* Value */
-			USBDUXSUB_CPUCS,
-			/* Index */
-			0x0000, local_transfer_buffer,
-			/* Length */
-			1,
-			/* Timeout */
-			EZTIMEOUT);
-		if (errcode < 0) {
-			dev_err(&usbduxsub->interface->dev,
-				"comedi_: control msg failed (stop)\n");
-			return errcode;
-		}
+
+	/* 7f92 to one */
+	local_transfer_buffer[0] = 1;
+	errcode = usb_control_msg(usbduxsub->usbdev,
+				  usb_sndctrlpipe(usbduxsub->usbdev, 0),
+				  /* bRequest, "Firmware" */
+				  USBDUXSUB_FIRMWARE,
+				  /* bmRequestType */
+				  VENDOR_DIR_OUT,
+				  /* Value */
+				  USBDUXSUB_CPUCS,
+				  /* Index */
+				  0x0000, local_transfer_buffer,
+				  /* Length */
+				  1,
+				  /* Timeout */
+				  EZTIMEOUT);
+	if (errcode < 0) {
+		dev_err(&usbduxsub->interface->dev,
+			"comedi_: control msg failed (stop)\n");
+		return errcode;
 	}
 	return 0;
 }
@@ -784,13 +783,7 @@ static int usbduxsub_upload(struct usbduxsub *usbduxsub,
 {
 	int errcode;
 
-	if (usbduxsub->probed) {
-		dev_dbg(&usbduxsub->interface->dev,
-			"comedi%d: usbdux: uploading %d bytes"
-			" to addr %d, first byte=%d.\n",
-			usbduxsub->comedidev->minor, len,
-			startAddr, local_transfer_buffer[0]);
-		errcode = usb_control_msg(usbduxsub->usbdev,
+	errcode = usb_control_msg(usbduxsub->usbdev,
 			usb_sndctrlpipe(usbduxsub->usbdev, 0),
 			/* brequest, firmware */
 			USBDUXSUB_FIRMWARE,
@@ -806,16 +799,12 @@ static int usbduxsub_upload(struct usbduxsub *usbduxsub,
 			len,
 			/* timeout */
 			EZTIMEOUT);
-		dev_dbg(&usbduxsub->interface->dev,
-			"comedi_: result=%d\n", errcode);
-		if (errcode < 0) {
-			dev_err(&usbduxsub->interface->dev,
-				"comedi_: upload failed\n");
-			return errcode;
-		}
-	} else {
-		/* no device on the bus for this index */
-		return -EFAULT;
+	dev_dbg(&usbduxsub->interface->dev,
+		"comedi_: result=%d\n", errcode);
+	if (errcode < 0) {
+		dev_err(&usbduxsub->interface->dev,
+		"comedi_: upload failed\n");
+		return errcode;
 	}
 	return 0;
 }
@@ -2292,7 +2281,7 @@ static unsigned hex2unsigned(char *h)
 #define FIRMWARE_MAX_LEN 0x2000
 
 /* taken from David Brownell's fxload and adjusted for this driver */
-static int read_firmware(struct usbduxsub *usbduxsub, void *firmwarePtr,
+static int read_firmware(struct usbduxsub *usbduxsub, const void *firmwarePtr,
 			 long size)
 {
 	struct device *dev = &usbduxsub->interface->dev;
@@ -2399,6 +2388,34 @@ static int read_firmware(struct usbduxsub *usbduxsub, void *firmwarePtr,
 	return res;
 }
 
+static void usbdux_firmware_request_complete_handler(const struct firmware *fw,
+						     void *context)
+{
+	struct usbduxsub *usbduxsub_tmp = context;
+	struct usb_device *usbdev = usbduxsub_tmp->usbdev;
+	int ret;
+
+	if (fw == NULL) {
+		dev_err(&usbdev->dev,
+			"Firmware complete handler without firmware!\n");
+		return;
+	}
+
+	/*
+	 * we need to upload the firmware here because fw will be
+	 * freed once we've left this function
+	 */
+	ret = read_firmware(usbduxsub_tmp, fw->data, fw->size);
+
+	if (ret) {
+		dev_err(&usbdev->dev,
+			"Could not upload firmware (err=%d)\n",
+			ret);
+		return;
+	}
+	comedi_usb_auto_config(usbdev, BOARDNAME);
+}
+
 /* allocate memory for the urbs and initialise them */
 static int usbduxsub_probe(struct usb_interface *uinterf,
 			   const struct usb_device_id *id)
@@ -2407,6 +2424,7 @@ static int usbduxsub_probe(struct usb_interface *uinterf,
 	struct device *dev = &uinterf->dev;
 	int i;
 	int index;
+	int ret;
 
 	dev_dbg(dev, "comedi_: usbdux_: "
 		"finding a free structure for the usb-device\n");
@@ -2641,6 +2659,19 @@ static int usbduxsub_probe(struct usb_interface *uinterf,
 	/* we've reached the bottom of the function */
 	usbduxsub[index].probed = 1;
 	up(&start_stop_sem);
+
+	ret = request_firmware_nowait(THIS_MODULE,
+				      FW_ACTION_HOTPLUG,
+				      "usbdux_firmware.hex",
+				      &udev->dev,
+				      usbduxsub + index,
+				      usbdux_firmware_request_complete_handler);
+
+	if (ret) {
+		dev_err(dev, "Could not load firmware (err=%d)\n", ret);
+		return ret;
+	}
+
 	dev_info(dev, "comedi_: usbdux%d "
 		 "has been successfully initialised.\n", index);
 	/* success */
@@ -2662,6 +2693,7 @@ static void usbduxsub_disconnect(struct usb_interface *intf)
 			"comedi_: BUG! called with wrong ptr!!!\n");
 		return;
 	}
+	comedi_usb_auto_unconfig(udev);
 	down(&start_stop_sem);
 	down(&usbduxsub_tmp->sem);
 	tidy_up(usbduxsub_tmp);

drivers/staging/comedi/drivers/usbduxfast.c

@@ -33,9 +33,12 @@
  *       1MHz/16ch=62.5kHz
  * 0.99: Ian Abbott pointed out a bug which has been corrected. Thanks!
  * 0.99a: added external trigger.
+ * 1.00: added firmware kernel request to the driver which fixed
+ *       udev coldplug problem
  */
 
 #include <linux/kernel.h>
+#include <linux/firmware.h>
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/slab.h>
@@ -48,7 +51,7 @@
 #include "../comedidev.h"
 
 
-#define DRIVER_VERSION "v0.99a"
+#define DRIVER_VERSION "v1.0"
 #define DRIVER_AUTHOR "Bernd Porr, BerndPorr@f2s.com"
 #define DRIVER_DESC "USB-DUXfast, BerndPorr@f2s.com"
 #define BOARDNAME "usbduxfast"
@@ -444,9 +447,6 @@ static int usbduxfastsub_start(struct usbduxfastsub_s *udfs)
 	int ret;
 	unsigned char local_transfer_buffer[16];
 
-	if (!udfs->probed)
-		return 0;
-
 	/* 7f92 to zero */
 	local_transfer_buffer[0] = 0;
 	ret = usb_control_msg(udfs->usbdev,
@@ -471,9 +471,6 @@ static int usbduxfastsub_stop(struct usbduxfastsub_s *udfs)
 	int ret;
 	unsigned char local_transfer_buffer[16];
 
-	if (!udfs->probed)
-		return 0;
-
 	/* 7f92 to one */
 	local_transfer_buffer[0] = 1;
 	ret = usb_control_msg(udfs->usbdev,
@@ -500,10 +497,6 @@ static int usbduxfastsub_upload(struct usbduxfastsub_s *udfs,
 {
 	int ret;
 
-	if (!udfs->probed)
-		/* no device on the bus for this index */
-		return -EFAULT;
-
 #ifdef CONFIG_COMEDI_DEBUG
 	printk(KERN_DEBUG "comedi%d: usbduxfast: uploading %d bytes",
 		udfs->comedidev->minor, len);
@@ -1396,8 +1389,8 @@ static unsigned hex2unsigned(char *h)
 /*
  * taken from David Brownell's fxload and adjusted for this driver
  */
-static int read_firmware(struct usbduxfastsub_s *udfs, void *firmwarePtr,
-	long size)
+static int read_firmware(struct usbduxfastsub_s *udfs, const void *firmwarePtr,
+			 long size)
 {
 	int i = 0;
 	unsigned char *fp = (char *)firmwarePtr;
@@ -1538,6 +1531,32 @@ static void tidy_up(struct usbduxfastsub_s *udfs)
 	udfs->ai_cmd_running = 0;
 }
 
+static void usbduxfast_firmware_request_complete_handler(const struct firmware *fw,
+							 void *context)
+{
+	struct usbduxfastsub_s *usbduxfastsub_tmp = context;
+	struct usb_device *usbdev = usbduxfastsub_tmp->usbdev;
+	int ret;
+
+	if (fw == NULL)
+		return;
+
+	/*
+	 * we need to upload the firmware here because fw will be
+	 * freed once we've left this function
+	 */
+	ret = read_firmware(usbduxfastsub_tmp, fw->data, fw->size);
+
+	if (ret) {
+		dev_err(&usbdev->dev,
+			"Could not upload firmware (err=%d)\n",
+			ret);
+		return;
+	}
+
+	comedi_usb_auto_config(usbdev, BOARDNAME);
+}
+
 /*
  * allocate memory for the urbs and initialise them
  */
@@ -1547,6 +1566,7 @@ static int usbduxfastsub_probe(struct usb_interface *uinterf,
 	struct usb_device *udev = interface_to_usbdev(uinterf);
 	int i;
 	int index;
+	int ret;
 
 	if (udev->speed != USB_SPEED_HIGH) {
 		printk(KERN_ERR "comedi_: usbduxfast_: This driver needs"
@@ -1644,6 +1664,20 @@ static int usbduxfastsub_probe(struct usb_interface *uinterf,
 	/* we've reached the bottom of the function */
 	usbduxfastsub[index].probed = 1;
 	up(&start_stop_sem);
+
+	ret = request_firmware_nowait(THIS_MODULE,
+				      FW_ACTION_HOTPLUG,
+				      "usbduxfast_firmware.hex",
+				      &udev->dev,
+				      usbduxfastsub + index,
+				      usbduxfast_firmware_request_complete_handler);
+
+	if (ret) {
+		dev_err(&udev->dev, "could not load firmware (err=%d)\n",
+			ret);
+		return ret;
+	}
+
 	printk(KERN_INFO "comedi_: usbduxfast%d has been successfully "
 	       "initialized.\n", index);
 	/* success */
@@ -1665,6 +1699,9 @@ static void usbduxfastsub_disconnect(struct usb_interface *intf)
 		       "ptr!!!\n");
 		return;
 	}
+
+	comedi_usb_auto_unconfig(udev);
+
 	down(&start_stop_sem);
 	down(&udfs->sem);
 	tidy_up(udfs);
@@ -1714,10 +1751,10 @@ static int usbduxfast_attach(comedi_device *dev, comedi_devconfig *it)
 
 	/* trying to upload the firmware into the chip */
 	if (comedi_aux_data(it->options, 0) &&
-		it->options[COMEDI_DEVCONF_AUX_DATA_LENGTH]) {
+	    it->options[COMEDI_DEVCONF_AUX_DATA_LENGTH]) {
 		read_firmware(&usbduxfastsub[index],
-			comedi_aux_data(it->options, 0),
-			it->options[COMEDI_DEVCONF_AUX_DATA_LENGTH]);
+			      comedi_aux_data(it->options, 0),
+			      it->options[COMEDI_DEVCONF_AUX_DATA_LENGTH]);
 	}
 
 	dev->board_name = BOARDNAME;