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(*hx), GFP_KERNEL); 78 if (!hx) 79 return -ENOMEM; 80 81 /* stop the CPU */ 82 hx->data[0] = 1; 83 ret = usb_cypress_writemem(udev, cypress[type].cs_reg, hx->data, 1); 84 if (ret != 1) { 85 dev_err(&udev->dev, "%s: CPU stop failed=%d\n", 86 KBUILD_MODNAME, ret); 87 ret = -EIO; 88 goto err_kfree; 89 } 90 91 /* write firmware to memory */ 92 for (;;) { 93 ret = cypress_get_hexline(fw, hx, &pos); 94 if (ret < 0) 95 goto err_kfree; 96 else if (ret == 0) 97 break; 98 99 ret = usb_cypress_writemem(udev, hx->addr, hx->data, hx->len); 100 if (ret < 0) { 101 goto err_kfree; 102 } else if (ret != hx->len) { 103 dev_err(&udev->dev, 104 "%s: error while transferring firmware (transferred size=%d, block size=%d)\n", 105 KBUILD_MODNAME, ret, hx->len); 106 ret = -EIO; 107 goto err_kfree; 108 } 109 } 110 111 /* start the CPU */ 112 hx->data[0] = 0; 113 ret = usb_cypress_writemem(udev, cypress[type].cs_reg, hx->data, 1); 114 if (ret != 1) { 115 dev_err(&udev->dev, "%s: CPU start failed=%d\n", 116 KBUILD_MODNAME, ret); 117 ret = -EIO; 118 goto err_kfree; 119 } 120 121 ret = 0; 122 err_kfree: 123 kfree(hx); 124 return ret; 125 } 126 EXPORT_SYMBOL(cypress_load_firmware); 127 128 MODULE_AUTHOR("Antti Palosaari <crope@iki.fi>"); 129 MODULE_DESCRIPTION("Cypress firmware download"); 130 MODULE_LICENSE("GPL"); 131