1 /* cx25840 firmware functions
2 *
3 * This program is free software; you can redistribute it and/or
4 * modify it under the terms of the GNU General Public License
5 * as published by the Free Software Foundation; either version 2
6 * of the License, or (at your option) any later version.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public License
14 * along with this program; if not, write to the Free Software
15 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
16 */
17
18 #include <linux/module.h>
19 #include <linux/i2c.h>
20 #include <linux/firmware.h>
21 #include <media/v4l2-common.h>
22 #include <media/cx25840.h>
23
24 #include "cx25840-core.h"
25
26 #define FWFILE "v4l-cx25840.fw"
27 #define FWFILE_CX23885 "v4l-cx23885-avcore-01.fw"
28 #define FWFILE_CX231XX "v4l-cx231xx-avcore-01.fw"
29
30 /*
31 * Mike Isely <isely@pobox.com> - The FWSEND parameter controls the
32 * size of the firmware chunks sent down the I2C bus to the chip.
33 * Previously this had been set to 1024 but unfortunately some I2C
34 * implementations can't transfer data in such big gulps.
35 * Specifically, the pvrusb2 driver has a hard limit of around 60
36 * bytes, due to the encapsulation there of I2C traffic into USB
37 * messages. So we have to significantly reduce this parameter.
38 */
39 #define FWSEND 48
40
41 #define FWDEV(x) &((x)->dev)
42
43 static char *firmware = FWFILE;
44
45 module_param(firmware, charp, 0444);
46
47 MODULE_PARM_DESC(firmware, "Firmware image [default: " FWFILE "]");
48
49 static void start_fw_load(struct i2c_client *client)
50 {
51 /* DL_ADDR_LB=0 DL_ADDR_HB=0 */
52 cx25840_write(client, 0x800, 0x00);
53 cx25840_write(client, 0x801, 0x00);
54 // DL_MAP=3 DL_AUTO_INC=0 DL_ENABLE=1
55 cx25840_write(client, 0x803, 0x0b);
56 /* AUTO_INC_DIS=1 */
57 cx25840_write(client, 0x000, 0x20);
58 }
59
60 static void end_fw_load(struct i2c_client *client)
61 {
62 /* AUTO_INC_DIS=0 */
63 cx25840_write(client, 0x000, 0x00);
64 /* DL_ENABLE=0 */
65 cx25840_write(client, 0x803, 0x03);
66 }
67
68 static int check_fw_load(struct i2c_client *client, int size)
69 {
70 /* DL_ADDR_HB DL_ADDR_LB */
71 int s = cx25840_read(client, 0x801) << 8;
72 s |= cx25840_read(client, 0x800);
73
74 if (size != s) {
75 v4l_err(client, "firmware %s load failed\n", firmware);
76 return -EINVAL;
77 }
78
79 v4l_info(client, "loaded %s firmware (%d bytes)\n", firmware, size);
80 return 0;
81 }
82
83 static int fw_write(struct i2c_client *client, const u8 *data, int size)
84 {
85 if (i2c_master_send(client, data, size) < size) {
86 v4l_err(client, "firmware load i2c failure\n");
87 return -ENOSYS;
88 }
89
90 return 0;
91 }
92
93 int cx25840_loadfw(struct i2c_client *client)
94 {
95 struct cx25840_state *state = to_state(i2c_get_clientdata(client));
96 const struct firmware *fw = NULL;
97 u8 buffer[FWSEND];
98 const u8 *ptr;
99 int size, retval;
100 int MAX_BUF_SIZE = FWSEND;
101
102 if (state->is_cx23885)
103 firmware = FWFILE_CX23885;
104 else if (state->is_cx231xx)
105 firmware = FWFILE_CX231XX;
106
107 if ((state->is_cx231xx) && MAX_BUF_SIZE > 16) {
108 v4l_err(client, " Firmware download size changed to 16 bytes max length\n");
109 MAX_BUF_SIZE = 16; /* cx231xx cannot accept more than 16 bytes at a time */
110 }
111
112 if (request_firmware(&fw, firmware, FWDEV(client)) != 0) {
113 v4l_err(client, "unable to open firmware %s\n", firmware);
114 return -EINVAL;
115 }
116
117 start_fw_load(client);
118
119 buffer[0] = 0x08;
120 buffer[1] = 0x02;
121
122 size = fw->size;
123 ptr = fw->data;
124 while (size > 0) {
125 int len = min(MAX_BUF_SIZE - 2, size);
126
127 memcpy(buffer + 2, ptr, len);
128
129 retval = fw_write(client, buffer, len + 2);
130
131 if (retval < 0) {
132 release_firmware(fw);
133 return retval;
134 }
135
136 size -= len;
137 ptr += len;
138 }
139
140 end_fw_load(client);
141
142 size = fw->size;
143 release_firmware(fw);
144
145 return check_fw_load(client, size);
146 }
147
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