1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
|
/* cx25840 firmware functions
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/firmware.h>
#include <media/v4l2-common.h>
#include <media/cx25840.h>
#include "cx25840-core.h"
/*
* Mike Isely <isely@pobox.com> - The FWSEND parameter controls the
* size of the firmware chunks sent down the I2C bus to the chip.
* Previously this had been set to 1024 but unfortunately some I2C
* implementations can't transfer data in such big gulps.
* Specifically, the pvrusb2 driver has a hard limit of around 60
* bytes, due to the encapsulation there of I2C traffic into USB
* messages. So we have to significantly reduce this parameter.
*/
#define FWSEND 48
#define FWDEV(x) &((x)->dev)
static char *firmware = "";
module_param(firmware, charp, 0444);
MODULE_PARM_DESC(firmware, "Firmware image to load");
static void start_fw_load(struct i2c_client *client)
{
/* DL_ADDR_LB=0 DL_ADDR_HB=0 */
cx25840_write(client, 0x800, 0x00);
cx25840_write(client, 0x801, 0x00);
// DL_MAP=3 DL_AUTO_INC=0 DL_ENABLE=1
cx25840_write(client, 0x803, 0x0b);
/* AUTO_INC_DIS=1 */
cx25840_write(client, 0x000, 0x20);
}
static void end_fw_load(struct i2c_client *client)
{
/* AUTO_INC_DIS=0 */
cx25840_write(client, 0x000, 0x00);
/* DL_ENABLE=0 */
cx25840_write(client, 0x803, 0x03);
}
static const char *get_fw_name(struct i2c_client *client)
{
struct cx25840_state *state = to_state(i2c_get_clientdata(client));
if (firmware[0])
return firmware;
if (state->is_cx23885)
return "v4l-cx23885-avcore-01.fw";
if (state->is_cx231xx)
return "v4l-cx231xx-avcore-01.fw";
return "v4l-cx25840.fw";
}
static int check_fw_load(struct i2c_client *client, int size)
{
/* DL_ADDR_HB DL_ADDR_LB */
int s = cx25840_read(client, 0x801) << 8;
s |= cx25840_read(client, 0x800);
if (size != s) {
v4l_err(client, "firmware %s load failed\n",
get_fw_name(client));
return -EINVAL;
}
v4l_info(client, "loaded %s firmware (%d bytes)\n",
get_fw_name(client), size);
return 0;
}
static int fw_write(struct i2c_client *client, const u8 *data, int size)
{
if (i2c_master_send(client, data, size) < size) {
v4l_err(client, "firmware load i2c failure\n");
return -ENOSYS;
}
return 0;
}
int cx25840_loadfw(struct i2c_client *client)
{
struct cx25840_state *state = to_state(i2c_get_clientdata(client));
const struct firmware *fw = NULL;
u8 buffer[FWSEND];
const u8 *ptr;
const char *fwname = get_fw_name(client);
int size, retval;
int MAX_BUF_SIZE = FWSEND;
u32 gpio_oe = 0, gpio_da = 0;
if (state->is_cx23885) {
/* Preserve the GPIO OE and output bits */
gpio_oe = cx25840_read(client, 0x160);
gpio_da = cx25840_read(client, 0x164);
}
if ((state->is_cx231xx) && MAX_BUF_SIZE > 16) {
v4l_err(client, " Firmware download size changed to 16 bytes max length\n");
MAX_BUF_SIZE = 16; /* cx231xx cannot accept more than 16 bytes at a time */
}
if (request_firmware(&fw, fwname, FWDEV(client)) != 0) {
v4l_err(client, "unable to open firmware %s\n", fwname);
return -EINVAL;
}
start_fw_load(client);
buffer[0] = 0x08;
buffer[1] = 0x02;
size = fw->size;
ptr = fw->data;
while (size > 0) {
int len = min(MAX_BUF_SIZE - 2, size);
memcpy(buffer + 2, ptr, len);
retval = fw_write(client, buffer, len + 2);
if (retval < 0) {
release_firmware(fw);
return retval;
}
size -= len;
ptr += len;
}
end_fw_load(client);
size = fw->size;
release_firmware(fw);
if (state->is_cx23885) {
/* Restore GPIO configuration after f/w load */
cx25840_write(client, 0x160, gpio_oe);
cx25840_write(client, 0x164, gpio_da);
}
return check_fw_load(client, size);
}
|
