drivers/media/common/cypress_firmware.c

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