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1// SPDX-License-Identifier: GPL-2.0-only2/* cypress_firmware.c is part of the DVB USB library.3 *4 * Copyright (C) 2004-6 Patrick Boettcher (patrick.boettcher@posteo.de)5 * see dvb-usb-init.c for copyright information.6 *7 * This file contains functions for downloading the firmware to Cypress FX 18 * and 2 based devices.9 *10 */11 12#include <linux/module.h>13#include <linux/slab.h>14#include <linux/usb.h>15#include <linux/firmware.h>16#include "cypress_firmware.h"17 18struct usb_cypress_controller {19 u8 id;20 const char *name; /* name of the usb controller */21 u16 cs_reg; /* needs to be restarted,22 * when the firmware has been downloaded */23};24 25static const struct usb_cypress_controller cypress[] = {26 { .id = CYPRESS_AN2135, .name = "Cypress AN2135", .cs_reg = 0x7f92 },27 { .id = CYPRESS_AN2235, .name = "Cypress AN2235", .cs_reg = 0x7f92 },28 { .id = CYPRESS_FX2, .name = "Cypress FX2", .cs_reg = 0xe600 },29};30 31/*32 * load a firmware packet to the device33 */34static int usb_cypress_writemem(struct usb_device *udev, u16 addr, u8 *data,35 u8 len)36{37 return usb_control_msg(udev, usb_sndctrlpipe(udev, 0),38 0xa0, USB_TYPE_VENDOR, addr, 0x00, data, len, 5000);39}40 41static int cypress_get_hexline(const struct firmware *fw,42 struct hexline *hx, int *pos)43{44 u8 *b = (u8 *) &fw->data[*pos];45 int data_offs = 4;46 47 if (*pos >= fw->size)48 return 0;49 50 memset(hx, 0, sizeof(struct hexline));51 hx->len = b[0];52 53 if ((*pos + hx->len + 4) >= fw->size)54 return -EINVAL;55 56 hx->addr = b[1] | (b[2] << 8);57 hx->type = b[3];58 59 if (hx->type == 0x04) {60 /* b[4] and b[5] are the Extended linear address record data61 * field */62 hx->addr |= (b[4] << 24) | (b[5] << 16);63 }64 65 memcpy(hx->data, &b[data_offs], hx->len);66 hx->chk = b[hx->len + data_offs];67 *pos += hx->len + 5;68 69 return *pos;70}71 72int cypress_load_firmware(struct usb_device *udev,73 const struct firmware *fw, int type)74{75 struct hexline *hx;76 int ret, pos = 0;77 78 hx = kmalloc(sizeof(*hx), GFP_KERNEL);79 if (!hx)80 return -ENOMEM;81 82 /* stop the CPU */83 hx->data[0] = 1;84 ret = usb_cypress_writemem(udev, cypress[type].cs_reg, hx->data, 1);85 if (ret != 1) {86 dev_err(&udev->dev, "%s: CPU stop failed=%d\n",87 KBUILD_MODNAME, ret);88 ret = -EIO;89 goto err_kfree;90 }91 92 /* write firmware to memory */93 for (;;) {94 ret = cypress_get_hexline(fw, hx, &pos);95 if (ret < 0)96 goto err_kfree;97 else if (ret == 0)98 break;99 100 ret = usb_cypress_writemem(udev, hx->addr, hx->data, hx->len);101 if (ret < 0) {102 goto err_kfree;103 } else if (ret != hx->len) {104 dev_err(&udev->dev,105 "%s: error while transferring firmware (transferred size=%d, block size=%d)\n",106 KBUILD_MODNAME, ret, hx->len);107 ret = -EIO;108 goto err_kfree;109 }110 }111 112 /* start the CPU */113 hx->data[0] = 0;114 ret = usb_cypress_writemem(udev, cypress[type].cs_reg, hx->data, 1);115 if (ret != 1) {116 dev_err(&udev->dev, "%s: CPU start failed=%d\n",117 KBUILD_MODNAME, ret);118 ret = -EIO;119 goto err_kfree;120 }121 122 ret = 0;123err_kfree:124 kfree(hx);125 return ret;126}127EXPORT_SYMBOL(cypress_load_firmware);128 129MODULE_AUTHOR("Antti Palosaari <crope@iki.fi>");130MODULE_DESCRIPTION("Cypress firmware download");131MODULE_LICENSE("GPL");132