mirror of https://gitee.com/openkylin/linux.git
132 lines
3.1 KiB
C
132 lines
3.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/* cypress_firmware.c is part of the DVB USB library.
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*
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* Copyright (C) 2004-6 Patrick Boettcher (patrick.boettcher@posteo.de)
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* see dvb-usb-init.c for copyright information.
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*
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* This file contains functions for downloading the firmware to Cypress FX 1
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* and 2 based devices.
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*
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*/
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/usb.h>
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#include <linux/firmware.h>
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#include "cypress_firmware.h"
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struct usb_cypress_controller {
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u8 id;
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const char *name; /* name of the usb controller */
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u16 cs_reg; /* needs to be restarted,
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* when the firmware has been downloaded */
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};
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static const struct usb_cypress_controller cypress[] = {
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{ .id = CYPRESS_AN2135, .name = "Cypress AN2135", .cs_reg = 0x7f92 },
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{ .id = CYPRESS_AN2235, .name = "Cypress AN2235", .cs_reg = 0x7f92 },
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{ .id = CYPRESS_FX2, .name = "Cypress FX2", .cs_reg = 0xe600 },
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};
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/*
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* load a firmware packet to the device
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*/
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static int usb_cypress_writemem(struct usb_device *udev, u16 addr, u8 *data,
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u8 len)
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{
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return usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
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0xa0, USB_TYPE_VENDOR, addr, 0x00, data, len, 5000);
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}
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static int cypress_get_hexline(const struct firmware *fw,
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struct hexline *hx, int *pos)
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{
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u8 *b = (u8 *) &fw->data[*pos];
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int data_offs = 4;
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if (*pos >= fw->size)
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return 0;
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memset(hx, 0, sizeof(struct hexline));
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hx->len = b[0];
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if ((*pos + hx->len + 4) >= fw->size)
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return -EINVAL;
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hx->addr = b[1] | (b[2] << 8);
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hx->type = b[3];
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if (hx->type == 0x04) {
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/* b[4] and b[5] are the Extended linear address record data
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* field */
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hx->addr |= (b[4] << 24) | (b[5] << 16);
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}
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memcpy(hx->data, &b[data_offs], hx->len);
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hx->chk = b[hx->len + data_offs];
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*pos += hx->len + 5;
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return *pos;
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}
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int cypress_load_firmware(struct usb_device *udev,
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const struct firmware *fw, int type)
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{
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struct hexline *hx;
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int ret, pos = 0;
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hx = kmalloc(sizeof(*hx), GFP_KERNEL);
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if (!hx)
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return -ENOMEM;
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/* stop the CPU */
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hx->data[0] = 1;
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ret = usb_cypress_writemem(udev, cypress[type].cs_reg, hx->data, 1);
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if (ret != 1) {
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dev_err(&udev->dev, "%s: CPU stop failed=%d\n",
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KBUILD_MODNAME, ret);
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ret = -EIO;
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goto err_kfree;
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}
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/* write firmware to memory */
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for (;;) {
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ret = cypress_get_hexline(fw, hx, &pos);
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if (ret < 0)
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goto err_kfree;
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else if (ret == 0)
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break;
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ret = usb_cypress_writemem(udev, hx->addr, hx->data, hx->len);
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if (ret < 0) {
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goto err_kfree;
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} else if (ret != hx->len) {
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dev_err(&udev->dev,
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"%s: error while transferring firmware (transferred size=%d, block size=%d)\n",
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KBUILD_MODNAME, ret, hx->len);
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ret = -EIO;
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goto err_kfree;
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}
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}
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/* start the CPU */
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hx->data[0] = 0;
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ret = usb_cypress_writemem(udev, cypress[type].cs_reg, hx->data, 1);
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if (ret != 1) {
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dev_err(&udev->dev, "%s: CPU start failed=%d\n",
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KBUILD_MODNAME, ret);
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ret = -EIO;
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goto err_kfree;
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}
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ret = 0;
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err_kfree:
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kfree(hx);
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return ret;
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}
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EXPORT_SYMBOL(cypress_load_firmware);
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MODULE_AUTHOR("Antti Palosaari <crope@iki.fi>");
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MODULE_DESCRIPTION("Cypress firmware download");
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MODULE_LICENSE("GPL");
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