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1// SPDX-License-Identifier: GPL-2.02/* dvb-usb-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 1 and 2 based devices.8 *9 * FIXME: This part does actually not belong to dvb-usb, but to the usb-subsystem.10 */11#include "dvb-usb-common.h"12 13#include <linux/usb.h>14 15struct usb_cypress_controller {16 int id;17 const char *name; /* name of the usb controller */18 u16 cpu_cs_register; /* needs to be restarted, when the firmware has been downloaded. */19};20 21static struct usb_cypress_controller cypress[] = {22 { .id = DEVICE_SPECIFIC, .name = "Device specific", .cpu_cs_register = 0 },23 { .id = CYPRESS_AN2135, .name = "Cypress AN2135", .cpu_cs_register = 0x7f92 },24 { .id = CYPRESS_AN2235, .name = "Cypress AN2235", .cpu_cs_register = 0x7f92 },25 { .id = CYPRESS_FX2, .name = "Cypress FX2", .cpu_cs_register = 0xe600 },26};27 28/*29 * load a firmware packet to the device30 */31static int usb_cypress_writemem(struct usb_device *udev,u16 addr,u8 *data, u8 len)32{33 return usb_control_msg(udev, usb_sndctrlpipe(udev,0),34 0xa0, USB_TYPE_VENDOR, addr, 0x00, data, len, 5000);35}36 37int usb_cypress_load_firmware(struct usb_device *udev, const struct firmware *fw, int type)38{39 struct hexline *hx;40 u8 *buf;41 int ret, pos = 0;42 u16 cpu_cs_register = cypress[type].cpu_cs_register;43 44 buf = kmalloc(sizeof(*hx), GFP_KERNEL);45 if (!buf)46 return -ENOMEM;47 hx = (struct hexline *)buf;48 49 /* stop the CPU */50 buf[0] = 1;51 if (usb_cypress_writemem(udev, cpu_cs_register, buf, 1) != 1)52 err("could not stop the USB controller CPU.");53 54 while ((ret = dvb_usb_get_hexline(fw, hx, &pos)) > 0) {55 deb_fw("writing to address 0x%04x (buffer: 0x%02x %02x)\n", hx->addr, hx->len, hx->chk);56 ret = usb_cypress_writemem(udev, hx->addr, hx->data, hx->len);57 58 if (ret != hx->len) {59 err("error while transferring firmware (transferred size: %d, block size: %d)",60 ret, hx->len);61 ret = -EINVAL;62 break;63 }64 }65 if (ret < 0) {66 err("firmware download failed at %d with %d",pos,ret);67 kfree(buf);68 return ret;69 }70 71 if (ret == 0) {72 /* restart the CPU */73 buf[0] = 0;74 if (usb_cypress_writemem(udev, cpu_cs_register, buf, 1) != 1) {75 err("could not restart the USB controller CPU.");76 ret = -EINVAL;77 }78 } else79 ret = -EIO;80 81 kfree(buf);82 83 return ret;84}85EXPORT_SYMBOL(usb_cypress_load_firmware);86 87int dvb_usb_download_firmware(struct usb_device *udev,88 const struct dvb_usb_device_properties *props)89{90 int ret;91 const struct firmware *fw = NULL;92 93 if ((ret = request_firmware(&fw, props->firmware, &udev->dev)) != 0) {94 err("did not find the firmware file '%s' (status %d). You can use <kernel_dir>/scripts/get_dvb_firmware to get the firmware",95 props->firmware,ret);96 return ret;97 }98 99 info("downloading firmware from file '%s'",props->firmware);100 101 switch (props->usb_ctrl) {102 case CYPRESS_AN2135:103 case CYPRESS_AN2235:104 case CYPRESS_FX2:105 ret = usb_cypress_load_firmware(udev, fw, props->usb_ctrl);106 break;107 case DEVICE_SPECIFIC:108 if (props->download_firmware)109 ret = props->download_firmware(udev,fw);110 else {111 err("BUG: driver didn't specified a download_firmware-callback, although it claims to have a DEVICE_SPECIFIC one.");112 ret = -EINVAL;113 }114 break;115 default:116 ret = -EINVAL;117 break;118 }119 120 release_firmware(fw);121 return ret;122}123 124int dvb_usb_get_hexline(const struct firmware *fw, struct hexline *hx,125 int *pos)126{127 u8 *b = (u8 *) &fw->data[*pos];128 int data_offs = 4;129 if (*pos >= fw->size)130 return 0;131 132 memset(hx,0,sizeof(struct hexline));133 134 hx->len = b[0];135 136 if ((*pos + hx->len + 4) >= fw->size)137 return -EINVAL;138 139 hx->addr = b[1] | (b[2] << 8);140 hx->type = b[3];141 142 if (hx->type == 0x04) {143 /* b[4] and b[5] are the Extended linear address record data field */144 hx->addr |= (b[4] << 24) | (b[5] << 16);145/* hx->len -= 2;146 data_offs += 2; */147 }148 memcpy(hx->data,&b[data_offs],hx->len);149 hx->chk = b[hx->len + data_offs];150 151 *pos += hx->len + 5;152 153 return *pos;154}155EXPORT_SYMBOL(dvb_usb_get_hexline);156