Add the rt linux 4.1.3-rt3 as base
[kvmfornfv.git] / kernel / 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@desy.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");