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
29 /*
30 * Mike Isely <isely@pobox.com> - The FWSEND parameter controls the
31 * size of the firmware chunks sent down the I2C bus to the chip.
32 * Previously this had been set to 1024 but unfortunately some I2C
33 * implementations can't transfer data in such big gulps.
34 * Specifically, the pvrusb2 driver has a hard limit of around 60
35 * bytes, due to the encapsulation there of I2C traffic into USB
36 * messages. So we have to significantly reduce this parameter.
37 */
38 #define FWSEND 48
39
40 #define FWDEV(x) &((x)->dev)
41
42 static char *firmware = FWFILE;
43
44 module_param(firmware, charp, 0444);
45
46 MODULE_PARM_DESC(firmware, "Firmware image [default: " FWFILE "]");
47
48 static void start_fw_load(struct i2c_client *client)
49 {
50 /* DL_ADDR_LB=0 DL_ADDR_HB=0 */
51 cx25840_write(client, 0x800, 0x00);
52 cx25840_write(client, 0x801, 0x00);
53 // DL_MAP=3 DL_AUTO_INC=0 DL_ENABLE=1
54 cx25840_write(client, 0x803, 0x0b);
55 /* AUTO_INC_DIS=1 */
56 cx25840_write(client, 0x000, 0x20);
57 }
58
59 static void end_fw_load(struct i2c_client *client)
60 {
61 /* AUTO_INC_DIS=0 */
62 cx25840_write(client, 0x000, 0x00);
63 /* DL_ENABLE=0 */
64 cx25840_write(client, 0x803, 0x03);
65 }
66
67 static int check_fw_load(struct i2c_client *client, int size)
68 {
69 /* DL_ADDR_HB DL_ADDR_LB */
70 int s = cx25840_read(client, 0x801) << 8;
71 s |= cx25840_read(client, 0x800);
72
73 if (size != s) {
74 v4l_err(client, "firmware %s load failed\n", firmware);
75 return -EINVAL;
76 }
77
78 v4l_info(client, "loaded %s firmware (%d bytes)\n", firmware, size);
79 return 0;
80 }
81
82 static int fw_write(struct i2c_client *client, u8 * data, int size)
83 {
84 int sent;
85
86 if ((sent = i2c_master_send(client, data, size)) < size) {
87 v4l_err(client, "firmware load i2c failure\n");
88 return -ENOSYS;
89 }
90
91 return 0;
92 }
93
94 int cx25840_loadfw(struct i2c_client *client)
95 {
96 struct cx25840_state *state = i2c_get_clientdata(client);
97 const struct firmware *fw = NULL;
98 u8 buffer[4], *ptr;
99 int size, send, retval;
100
101 if (state->is_cx23885)
102 firmware = FWFILE_CX23885;
103
104 if (request_firmware(&fw, firmware, FWDEV(client)) != 0) {
105 v4l_err(client, "unable to open firmware %s\n", firmware);
106 return -EINVAL;
107 }
108
109 start_fw_load(client);
110
111 buffer[0] = 0x08;
112 buffer[1] = 0x02;
113 buffer[2] = fw->data[0];
114 buffer[3] = fw->data[1];
115 retval = fw_write(client, buffer, 4);
116
117 if (retval < 0) {
118 release_firmware(fw);
119 return retval;
120 }
121
122 size = fw->size - 2;
123 ptr = fw->data;
124 while (size > 0) {
125 ptr[0] = 0x08;
126 ptr[1] = 0x02;
127 send = size > (FWSEND - 2) ? FWSEND : size + 2;
128 retval = fw_write(client, ptr, send);
129
130 if (retval < 0) {
131 release_firmware(fw);
132 return retval;
133 }
134
135 size -= FWSEND - 2;
136 ptr += FWSEND - 2;
137 }
138
139 end_fw_load(client);
140
141 size = fw->size;
142 release_firmware(fw);
143
144 return check_fw_load(client, size);
145 }
146
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