original_kernel/drivers/media/dvb/dvb-usb/dvb_usb_firmware.c

/* dvb-usb-firmware.c is part of the DVB USB library.
 *
 * Copyright (C) 2004-6 Patrick Boettcher (patrick.boettcher@desy.de)
 * see dvb-usb-init.c for copyright information.
 *
 * This file contains functions for downloading the firmware to Cypress FX 1
 * and 2 based devices.
 *
 * FIXME: This part does actually not belong to dvb-usb, but to the
 * usb-subsystem.
 */
#include "dvb_usb_common.h"

#include <linux/usb.h>

struct usb_cypress_controller {
	int id;
	/* name of the usb controller */
	const char *name;
	/* needs to be restarted, when the firmware has been downloaded. */
	u16 cpu_cs_register;
};

static struct usb_cypress_controller cypress[] = {
	{ .id = DEVICE_SPECIFIC, .name = "Device specific",
		.cpu_cs_register = 0 },
	{ .id = CYPRESS_AN2135,  .name = "Cypress AN2135",
		.cpu_cs_register = 0x7f92 },
	{ .id = CYPRESS_AN2235,  .name = "Cypress AN2235",
		.cpu_cs_register = 0x7f92 },
	{ .id = CYPRESS_FX2,     .name = "Cypress FX2",
		.cpu_cs_register = 0xe600 },
};

/*
 * load a firmware packet to the device
 */
static int usb_cypress_writemem(struct usb_device *udev, u16 addr, u8 *data,
		u8 len)
{
	return usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
			0xa0, USB_TYPE_VENDOR, addr, 0x00, data, len, 5000);
}

int usbv2_cypress_load_firmware(struct usb_device *udev,
		const struct firmware *fw, int type)
{
	struct hexline hx;
	u8 reset;
	int ret, pos = 0;

	/* stop the CPU */
	reset = 1;
	ret = usb_cypress_writemem(udev, cypress[type].cpu_cs_register,
			&reset, 1);
	if (ret != 1)
		err("could not stop the USB controller CPU.");

	while ((ret = dvb_usbv2_get_hexline(fw, &hx, &pos)) > 0) {
		deb_fw("writing to address 0x%04x (buffer: 0x%02x %02x)\n",
				hx.addr, hx.len, hx.chk);
		ret = usb_cypress_writemem(udev, hx.addr, hx.data, hx.len);

		if (ret != hx.len) {
			err("error while transferring firmware " \
				"(transferred size: %d, block size: %d)",
				ret, hx.len);
			ret = -EINVAL;
			break;
		}
	}
	if (ret < 0) {
		err("firmware download failed at %d with %d", pos, ret);
		return ret;
	}

	if (ret == 0) {
		/* restart the CPU */
		reset = 0;
		if (ret || usb_cypress_writemem(udev,
				cypress[type].cpu_cs_register,
				&reset, 1) != 1) {
			err("could not restart the USB controller CPU.");
			ret = -EINVAL;
		}
	} else
		ret = -EIO;

	return ret;
}
EXPORT_SYMBOL(usbv2_cypress_load_firmware);

int dvb_usb_download_firmware(struct dvb_usb_device *d)
{
	int ret;
	const struct firmware *fw = NULL;
	const char *name;

	/* resolve firmware name */
	name = d->props.firmware;
	if (d->props.get_firmware_name) {
		ret = d->props.get_firmware_name(d, &name);
		if (ret < 0)
			return ret;
	}

	ret = request_firmware(&fw, name, &d->udev->dev);
	if (ret != 0) {
		err("did not find the firmware file. (%s) " \
			"Please see linux/Documentation/dvb/ for more" \
			" details on firmware-problems. (%d)",
			name, ret);
		return ret;
	}

	info("downloading firmware from file '%s'", name);

	switch (d->props.usb_ctrl) {
	case CYPRESS_AN2135:
	case CYPRESS_AN2235:
	case CYPRESS_FX2:
		ret = usbv2_cypress_load_firmware(d->udev, fw,
				d->props.usb_ctrl);
		break;
	case DEVICE_SPECIFIC:
		if (d->props.download_firmware)
			ret = d->props.download_firmware(d, fw);
		else {
			err("BUG: driver didn't specified a download_firmware" \
				"-callback, although it claims to have a" \
				" DEVICE_SPECIFIC one.");
			ret = -EINVAL;
		}
		break;
	default:
		ret = -EINVAL;
		break;
	}

	release_firmware(fw);
	return ret;
}

int dvb_usbv2_get_hexline(const struct firmware *fw, struct hexline *hx,
			       int *pos)
{
	u8 *b = (u8 *) &fw->data[*pos];
	int data_offs = 4;
	if (*pos >= fw->size)
		return 0;

	memset(hx, 0, sizeof(struct hexline));

	hx->len  = b[0];

	if ((*pos + hx->len + 4) >= fw->size)
		return -EINVAL;

	hx->addr = b[1] | (b[2] << 8);
	hx->type = b[3];

	if (hx->type == 0x04) {
		/* b[4] and b[5] are the Extended linear address record data
		 * field */
		hx->addr |= (b[4] << 24) | (b[5] << 16);
/*		hx->len -= 2;
		data_offs += 2; */
	}
	memcpy(hx->data, &b[data_offs], hx->len);
	hx->chk = b[hx->len + data_offs];

	*pos += hx->len + 5;

	return *pos;
}
EXPORT_SYMBOL(dvb_usbv2_get_hexline);