drivers/usb/misc/emi62.c - arm/linux - Git at Google

 /*
  * Emagic EMI 2|6 usb audio interface firmware loader.
  * Copyright (C) 2002
  * 	Tapio Laxström (tapio.laxstrom@iptime.fi)
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License, as published by
  * the Free Software Foundation, version 2.
  */
 #include <linux/kernel.h>
 #include <linux/errno.h>
 #include <linux/slab.h>
 #include <linux/module.h>
 #include <linux/usb.h>
 #include <linux/delay.h>
 #include <linux/firmware.h>
 #include <linux/ihex.h>

 /* include firmware (variables)*/

 /* FIXME: This is quick and dirty solution! */
 #define SPDIF	/* if you want SPDIF comment next line */
 //#undef SPDIF	/* if you want MIDI uncomment this line */

 #ifdef SPDIF
 #define FIRMWARE_FW "emi62/spdif.fw"
 #else
 #define FIRMWARE_FW "emi62/midi.fw"
 #endif

 #define EMI62_VENDOR_ID 		0x086a  /* Emagic Soft-und Hardware GmBH */
 #define EMI62_PRODUCT_ID		0x0110	/* EMI 6|2m without firmware */

 #define ANCHOR_LOAD_INTERNAL	0xA0	/* Vendor specific request code for Anchor Upload/Download (This one is implemented in the core) */
 #define ANCHOR_LOAD_EXTERNAL	0xA3	/* This command is not implemented in the core. Requires firmware */
 #define ANCHOR_LOAD_FPGA	0xA5	/* This command is not implemented in the core. Requires firmware. Emagic extension */
 #define MAX_INTERNAL_ADDRESS	0x1B3F	/* This is the highest internal RAM address for the AN2131Q */
 #define CPUCS_REG		0x7F92  /* EZ-USB Control and Status Register.  Bit 0 controls 8051 reset */
 #define INTERNAL_RAM(address)   (address <= MAX_INTERNAL_ADDRESS)

 static int emi62_writememory(struct usb_device *dev, int address,
 			     const unsigned char *data, int length,
 			     __u8 bRequest);
 static int emi62_set_reset(struct usb_device *dev, unsigned char reset_bit);
 static int emi62_load_firmware (struct usb_device *dev);
 static int emi62_probe(struct usb_interface *intf, const struct usb_device_id *id);
 static void emi62_disconnect(struct usb_interface *intf);

 /* thanks to drivers/usb/serial/keyspan_pda.c code */
 static int emi62_writememory(struct usb_device *dev, int address,
 			     const unsigned char *data, int length,
 			     __u8 request)
 {
 	int result;
 	unsigned char *buffer =  kmemdup(data, length, GFP_KERNEL);

 	if (!buffer) {
 		dev_err(&dev->dev, "kmalloc(%d) failed.\n", length);
 		return -ENOMEM;
 	}
 	/* Note: usb_control_msg returns negative value on error or length of the
 	 * 		 data that was written! */
 	result = usb_control_msg (dev, usb_sndctrlpipe(dev, 0), request, 0x40, address, 0, buffer, length, 300);
 	kfree (buffer);
 	return result;
 }

 /* thanks to drivers/usb/serial/keyspan_pda.c code */
 static int emi62_set_reset (struct usb_device *dev, unsigned char reset_bit)
 {
 	int response;
 	dev_info(&dev->dev, "%s - %d\n", __func__, reset_bit);

 	response = emi62_writememory (dev, CPUCS_REG, &reset_bit, 1, 0xa0);
 	if (response < 0)
 		dev_err(&dev->dev, "set_reset (%d) failed\n", reset_bit);
 	return response;
 }

 #define FW_LOAD_SIZE		1023

 static int emi62_load_firmware (struct usb_device *dev)
 {
 	const struct firmware *loader_fw = NULL;
 	const struct firmware *bitstream_fw = NULL;
 	const struct firmware *firmware_fw = NULL;
 	const struct ihex_binrec *rec;
 	int err = -ENOMEM;
 	int i;
 	__u32 addr;	/* Address to write */
 	__u8 *buf;

 	dev_dbg(&dev->dev, "load_firmware\n");
 	buf = kmalloc(FW_LOAD_SIZE, GFP_KERNEL);
 	if (!buf)
 		goto wraperr;

 	err = request_ihex_firmware(&loader_fw, "emi62/loader.fw", &dev->dev);
 	if (err)
 		goto nofw;

 	err = request_ihex_firmware(&bitstream_fw, "emi62/bitstream.fw",
 				    &dev->dev);
 	if (err)
 		goto nofw;

 	err = request_ihex_firmware(&firmware_fw, FIRMWARE_FW, &dev->dev);
 	if (err) {
 	nofw:
 		goto wraperr;
 	}

 	/* Assert reset (stop the CPU in the EMI) */
 	err = emi62_set_reset(dev,1);
 	if (err < 0)
 		goto wraperr;

 	rec = (const struct ihex_binrec *)loader_fw->data;

 	/* 1. We need to put the loader for the FPGA into the EZ-USB */
 	while (rec) {
 		err = emi62_writememory(dev, be32_to_cpu(rec->addr),
 					rec->data, be16_to_cpu(rec->len),
 					ANCHOR_LOAD_INTERNAL);
 		if (err < 0)
 			goto wraperr;
 		rec = ihex_next_binrec(rec);
 	}

 	/* De-assert reset (let the CPU run) */
 	err = emi62_set_reset(dev,0);
 	if (err < 0)
 		goto wraperr;
 	msleep(250);	/* let device settle */

 	/* 2. We upload the FPGA firmware into the EMI
 	 * Note: collect up to 1023 (yes!) bytes and send them with
 	 * a single request. This is _much_ faster! */
 	rec = (const struct ihex_binrec *)bitstream_fw->data;
 	do {
 		i = 0;
 		addr = be32_to_cpu(rec->addr);

 		/* intel hex records are terminated with type 0 element */
 		while (rec && (i + be16_to_cpu(rec->len) < FW_LOAD_SIZE)) {
 			memcpy(buf + i, rec->data, be16_to_cpu(rec->len));
 			i += be16_to_cpu(rec->len);
 			rec = ihex_next_binrec(rec);
 		}
 		err = emi62_writememory(dev, addr, buf, i, ANCHOR_LOAD_FPGA);
 		if (err < 0)
 			goto wraperr;
 	} while (rec);

 	/* Assert reset (stop the CPU in the EMI) */
 	err = emi62_set_reset(dev,1);
 	if (err < 0)
 		goto wraperr;

 	/* 3. We need to put the loader for the firmware into the EZ-USB (again...) */
 	for (rec = (const struct ihex_binrec *)loader_fw->data;
 	     rec; rec = ihex_next_binrec(rec)) {
 		err = emi62_writememory(dev, be32_to_cpu(rec->addr),
 					rec->data, be16_to_cpu(rec->len),
 					ANCHOR_LOAD_INTERNAL);
 		if (err < 0)
 			goto wraperr;
 	}

 	/* De-assert reset (let the CPU run) */
 	err = emi62_set_reset(dev,0);
 	if (err < 0)
 		goto wraperr;
 	msleep(250);	/* let device settle */

 	/* 4. We put the part of the firmware that lies in the external RAM into the EZ-USB */

 	for (rec = (const struct ihex_binrec *)firmware_fw->data;
 	     rec; rec = ihex_next_binrec(rec)) {
 		if (!INTERNAL_RAM(be32_to_cpu(rec->addr))) {
 			err = emi62_writememory(dev, be32_to_cpu(rec->addr),
 						rec->data, be16_to_cpu(rec->len),
 						ANCHOR_LOAD_EXTERNAL);
 			if (err < 0)
 				goto wraperr;
 		}
 	}

 	/* Assert reset (stop the CPU in the EMI) */
 	err = emi62_set_reset(dev,1);
 	if (err < 0)
 		goto wraperr;

 	for (rec = (const struct ihex_binrec *)firmware_fw->data;
 	     rec; rec = ihex_next_binrec(rec)) {
 		if (INTERNAL_RAM(be32_to_cpu(rec->addr))) {
 			err = emi62_writememory(dev, be32_to_cpu(rec->addr),
 						rec->data, be16_to_cpu(rec->len),
 						ANCHOR_LOAD_EXTERNAL);
 			if (err < 0)
 				goto wraperr;
 		}
 	}

 	/* De-assert reset (let the CPU run) */
 	err = emi62_set_reset(dev,0);
 	if (err < 0)
 		goto wraperr;
 	msleep(250);	/* let device settle */

 	release_firmware(loader_fw);
 	release_firmware(bitstream_fw);
 	release_firmware(firmware_fw);

 	kfree(buf);

 	/* return 1 to fail the driver inialization
 	 * and give real driver change to load */
 	return 1;

 wraperr:
 	if (err < 0)
 		dev_err(&dev->dev,"%s - error loading firmware: error = %d\n",
 			__func__, err);
 	release_firmware(loader_fw);
 	release_firmware(bitstream_fw);
 	release_firmware(firmware_fw);

 	kfree(buf);
 	dev_err(&dev->dev, "Error\n");
 	return err;
 }

 static const struct usb_device_id id_table[] = {
 	{ USB_DEVICE(EMI62_VENDOR_ID, EMI62_PRODUCT_ID) },
 	{ }                                             /* Terminating entry */
 };

 MODULE_DEVICE_TABLE (usb, id_table);

 static int emi62_probe(struct usb_interface *intf, const struct usb_device_id *id)
 {
 	struct usb_device *dev = interface_to_usbdev(intf);
 	dev_dbg(&intf->dev, "emi62_probe\n");

 	dev_info(&intf->dev, "%s start\n", __func__);

 	emi62_load_firmware(dev);

 	/* do not return the driver context, let real audio driver do that */
 	return -EIO;
 }

 static void emi62_disconnect(struct usb_interface *intf)
 {
 }

 static struct usb_driver emi62_driver = {
 	.name		= "emi62 - firmware loader",
 	.probe		= emi62_probe,
 	.disconnect	= emi62_disconnect,
 	.id_table	= id_table,
 };

 module_usb_driver(emi62_driver);

 MODULE_AUTHOR("Tapio Laxström");
 MODULE_DESCRIPTION("Emagic EMI 6|2m firmware loader.");
 MODULE_LICENSE("GPL");

 MODULE_FIRMWARE("emi62/loader.fw");
 MODULE_FIRMWARE("emi62/bitstream.fw");
 MODULE_FIRMWARE(FIRMWARE_FW);
 /* vi:ai:syntax=c:sw=8:ts=8:tw=80
  */
	/*
	* Emagic EMI 2\|6 usb audio interface firmware loader.
	* Copyright (C) 2002
	* Tapio Laxström (tapio.laxstrom@iptime.fi)
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License, as published by
	* the Free Software Foundation, version 2.
	*/
	#include <linux/kernel.h>
	#include <linux/errno.h>
	#include <linux/slab.h>
	#include <linux/module.h>
	#include <linux/usb.h>
	#include <linux/delay.h>
	#include <linux/firmware.h>
	#include <linux/ihex.h>

	/* include firmware (variables)*/

	/* FIXME: This is quick and dirty solution! */
	#define SPDIF /* if you want SPDIF comment next line */
	//#undef SPDIF /* if you want MIDI uncomment this line */

	#ifdef SPDIF
	#define FIRMWARE_FW "emi62/spdif.fw"
	#else
	#define FIRMWARE_FW "emi62/midi.fw"
	#endif

	#define EMI62_VENDOR_ID 0x086a /* Emagic Soft-und Hardware GmBH */
	#define EMI62_PRODUCT_ID 0x0110 /* EMI 6\|2m without firmware */

	#define ANCHOR_LOAD_INTERNAL 0xA0 /* Vendor specific request code for Anchor Upload/Download (This one is implemented in the core) */
	#define ANCHOR_LOAD_EXTERNAL 0xA3 /* This command is not implemented in the core. Requires firmware */
	#define ANCHOR_LOAD_FPGA 0xA5 /* This command is not implemented in the core. Requires firmware. Emagic extension */
	#define MAX_INTERNAL_ADDRESS 0x1B3F /* This is the highest internal RAM address for the AN2131Q */
	#define CPUCS_REG 0x7F92 /* EZ-USB Control and Status Register. Bit 0 controls 8051 reset */
	#define INTERNAL_RAM(address) (address <= MAX_INTERNAL_ADDRESS)

	static int emi62_writememory(struct usb_device *dev, int address,
	const unsigned char *data, int length,
	__u8 bRequest);
	static int emi62_set_reset(struct usb_device *dev, unsigned char reset_bit);
	static int emi62_load_firmware (struct usb_device *dev);
	static int emi62_probe(struct usb_interface intf, const struct usb_device_id id);
	static void emi62_disconnect(struct usb_interface *intf);

	/* thanks to drivers/usb/serial/keyspan_pda.c code */
	static int emi62_writememory(struct usb_device *dev, int address,
	const unsigned char *data, int length,
	__u8 request)
	{
	int result;
	unsigned char *buffer = kmemdup(data, length, GFP_KERNEL);

	if (!buffer) {
	dev_err(&dev->dev, "kmalloc(%d) failed.\n", length);
	return -ENOMEM;
	}
	/* Note: usb_control_msg returns negative value on error or length of the
	* data that was written! */
	result = usb_control_msg (dev, usb_sndctrlpipe(dev, 0), request, 0x40, address, 0, buffer, length, 300);
	kfree (buffer);
	return result;
	}

	/* thanks to drivers/usb/serial/keyspan_pda.c code */
	static int emi62_set_reset (struct usb_device *dev, unsigned char reset_bit)
	{
	int response;
	dev_info(&dev->dev, "%s - %d\n", __func__, reset_bit);

	response = emi62_writememory (dev, CPUCS_REG, &reset_bit, 1, 0xa0);
	if (response < 0)
	dev_err(&dev->dev, "set_reset (%d) failed\n", reset_bit);
	return response;
	}

	#define FW_LOAD_SIZE 1023

	static int emi62_load_firmware (struct usb_device *dev)
	{
	const struct firmware *loader_fw = NULL;
	const struct firmware *bitstream_fw = NULL;
	const struct firmware *firmware_fw = NULL;
	const struct ihex_binrec *rec;
	int err = -ENOMEM;
	int i;
	__u32 addr; /* Address to write */
	__u8 *buf;

	dev_dbg(&dev->dev, "load_firmware\n");
	buf = kmalloc(FW_LOAD_SIZE, GFP_KERNEL);
	if (!buf)
	goto wraperr;

	err = request_ihex_firmware(&loader_fw, "emi62/loader.fw", &dev->dev);
	if (err)
	goto nofw;

	err = request_ihex_firmware(&bitstream_fw, "emi62/bitstream.fw",
	&dev->dev);
	if (err)
	goto nofw;

	err = request_ihex_firmware(&firmware_fw, FIRMWARE_FW, &dev->dev);
	if (err) {
	nofw:
	goto wraperr;
	}

	/* Assert reset (stop the CPU in the EMI) */
	err = emi62_set_reset(dev,1);
	if (err < 0)
	goto wraperr;

	rec = (const struct ihex_binrec *)loader_fw->data;

	/* 1. We need to put the loader for the FPGA into the EZ-USB */
	while (rec) {
	err = emi62_writememory(dev, be32_to_cpu(rec->addr),
	rec->data, be16_to_cpu(rec->len),
	ANCHOR_LOAD_INTERNAL);
	if (err < 0)
	goto wraperr;
	rec = ihex_next_binrec(rec);
	}

	/* De-assert reset (let the CPU run) */
	err = emi62_set_reset(dev,0);
	if (err < 0)
	goto wraperr;
	msleep(250); /* let device settle */

	/* 2. We upload the FPGA firmware into the EMI
	* Note: collect up to 1023 (yes!) bytes and send them with
	* a single request. This is _much_ faster! */
	rec = (const struct ihex_binrec *)bitstream_fw->data;
	do {
	i = 0;
	addr = be32_to_cpu(rec->addr);

	/* intel hex records are terminated with type 0 element */
	while (rec && (i + be16_to_cpu(rec->len) < FW_LOAD_SIZE)) {
	memcpy(buf + i, rec->data, be16_to_cpu(rec->len));
	i += be16_to_cpu(rec->len);
	rec = ihex_next_binrec(rec);
	}
	err = emi62_writememory(dev, addr, buf, i, ANCHOR_LOAD_FPGA);
	if (err < 0)
	goto wraperr;
	} while (rec);

	/* Assert reset (stop the CPU in the EMI) */
	err = emi62_set_reset(dev,1);
	if (err < 0)
	goto wraperr;

	/* 3. We need to put the loader for the firmware into the EZ-USB (again...) */
	for (rec = (const struct ihex_binrec *)loader_fw->data;
	rec; rec = ihex_next_binrec(rec)) {
	err = emi62_writememory(dev, be32_to_cpu(rec->addr),
	rec->data, be16_to_cpu(rec->len),
	ANCHOR_LOAD_INTERNAL);
	if (err < 0)
	goto wraperr;
	}

	/* De-assert reset (let the CPU run) */
	err = emi62_set_reset(dev,0);
	if (err < 0)
	goto wraperr;
	msleep(250); /* let device settle */

	/* 4. We put the part of the firmware that lies in the external RAM into the EZ-USB */

	for (rec = (const struct ihex_binrec *)firmware_fw->data;
	rec; rec = ihex_next_binrec(rec)) {
	if (!INTERNAL_RAM(be32_to_cpu(rec->addr))) {
	err = emi62_writememory(dev, be32_to_cpu(rec->addr),
	rec->data, be16_to_cpu(rec->len),
	ANCHOR_LOAD_EXTERNAL);
	if (err < 0)
	goto wraperr;
	}
	}

	/* Assert reset (stop the CPU in the EMI) */
	err = emi62_set_reset(dev,1);
	if (err < 0)
	goto wraperr;

	for (rec = (const struct ihex_binrec *)firmware_fw->data;
	rec; rec = ihex_next_binrec(rec)) {
	if (INTERNAL_RAM(be32_to_cpu(rec->addr))) {
	err = emi62_writememory(dev, be32_to_cpu(rec->addr),
	rec->data, be16_to_cpu(rec->len),
	ANCHOR_LOAD_EXTERNAL);
	if (err < 0)
	goto wraperr;
	}
	}

	/* De-assert reset (let the CPU run) */
	err = emi62_set_reset(dev,0);
	if (err < 0)
	goto wraperr;
	msleep(250); /* let device settle */

	release_firmware(loader_fw);
	release_firmware(bitstream_fw);
	release_firmware(firmware_fw);

	kfree(buf);

	/* return 1 to fail the driver inialization
	* and give real driver change to load */
	return 1;

	wraperr:
	if (err < 0)
	dev_err(&dev->dev,"%s - error loading firmware: error = %d\n",
	__func__, err);
	release_firmware(loader_fw);
	release_firmware(bitstream_fw);
	release_firmware(firmware_fw);

	kfree(buf);
	dev_err(&dev->dev, "Error\n");
	return err;
	}

	static const struct usb_device_id id_table[] = {
	{ USB_DEVICE(EMI62_VENDOR_ID, EMI62_PRODUCT_ID) },
	{ } /* Terminating entry */
	};

	MODULE_DEVICE_TABLE (usb, id_table);

	static int emi62_probe(struct usb_interface intf, const struct usb_device_id id)
	{
	struct usb_device *dev = interface_to_usbdev(intf);
	dev_dbg(&intf->dev, "emi62_probe\n");

	dev_info(&intf->dev, "%s start\n", __func__);

	emi62_load_firmware(dev);

	/* do not return the driver context, let real audio driver do that */
	return -EIO;
	}

	static void emi62_disconnect(struct usb_interface *intf)
	{
	}

	static struct usb_driver emi62_driver = {
	.name = "emi62 - firmware loader",
	.probe = emi62_probe,
	.disconnect = emi62_disconnect,
	.id_table = id_table,
	};

	module_usb_driver(emi62_driver);

	MODULE_AUTHOR("Tapio Laxström");
	MODULE_DESCRIPTION("Emagic EMI 6\|2m firmware loader.");
	MODULE_LICENSE("GPL");

	MODULE_FIRMWARE("emi62/loader.fw");
	MODULE_FIRMWARE("emi62/bitstream.fw");
	MODULE_FIRMWARE(FIRMWARE_FW);
	/* vi:ai:syntax=c:sw=8:ts=8:tw=80
	*/