sched: Remove double_rq_lock() from __migrate_task()
[linux/fpc-iii.git] / drivers / media / i2c / cx25840 / cx25840-firmware.c
blobb3169f94ece879ee89ecb45d61e4a390927b5582
1 /* cx25840 firmware functions
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.
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.
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.
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>
24 #include "cx25840-core.h"
27 * Mike Isely <isely@pobox.com> - The FWSEND parameter controls the
28 * size of the firmware chunks sent down the I2C bus to the chip.
29 * Previously this had been set to 1024 but unfortunately some I2C
30 * implementations can't transfer data in such big gulps.
31 * Specifically, the pvrusb2 driver has a hard limit of around 60
32 * bytes, due to the encapsulation there of I2C traffic into USB
33 * messages. So we have to significantly reduce this parameter.
35 #define FWSEND 48
37 #define FWDEV(x) &((x)->dev)
39 static char *firmware = "";
41 module_param(firmware, charp, 0444);
43 MODULE_PARM_DESC(firmware, "Firmware image to load");
45 static void start_fw_load(struct i2c_client *client)
47 /* DL_ADDR_LB=0 DL_ADDR_HB=0 */
48 cx25840_write(client, 0x800, 0x00);
49 cx25840_write(client, 0x801, 0x00);
50 // DL_MAP=3 DL_AUTO_INC=0 DL_ENABLE=1
51 cx25840_write(client, 0x803, 0x0b);
52 /* AUTO_INC_DIS=1 */
53 cx25840_write(client, 0x000, 0x20);
56 static void end_fw_load(struct i2c_client *client)
58 /* AUTO_INC_DIS=0 */
59 cx25840_write(client, 0x000, 0x00);
60 /* DL_ENABLE=0 */
61 cx25840_write(client, 0x803, 0x03);
64 #define CX2388x_FIRMWARE "v4l-cx23885-avcore-01.fw"
65 #define CX231xx_FIRMWARE "v4l-cx231xx-avcore-01.fw"
66 #define CX25840_FIRMWARE "v4l-cx25840.fw"
68 static const char *get_fw_name(struct i2c_client *client)
70 struct cx25840_state *state = to_state(i2c_get_clientdata(client));
72 if (firmware[0])
73 return firmware;
74 if (is_cx2388x(state))
75 return CX2388x_FIRMWARE;
76 if (is_cx231xx(state))
77 return CX231xx_FIRMWARE;
78 return CX25840_FIRMWARE;
81 static int check_fw_load(struct i2c_client *client, int size)
83 /* DL_ADDR_HB DL_ADDR_LB */
84 int s = cx25840_read(client, 0x801) << 8;
85 s |= cx25840_read(client, 0x800);
87 if (size != s) {
88 v4l_err(client, "firmware %s load failed\n",
89 get_fw_name(client));
90 return -EINVAL;
93 v4l_info(client, "loaded %s firmware (%d bytes)\n",
94 get_fw_name(client), size);
95 return 0;
98 static int fw_write(struct i2c_client *client, const u8 *data, int size)
100 if (i2c_master_send(client, data, size) < size) {
101 v4l_err(client, "firmware load i2c failure\n");
102 return -ENOSYS;
105 return 0;
108 int cx25840_loadfw(struct i2c_client *client)
110 struct cx25840_state *state = to_state(i2c_get_clientdata(client));
111 const struct firmware *fw = NULL;
112 u8 buffer[FWSEND];
113 const u8 *ptr;
114 const char *fwname = get_fw_name(client);
115 int size, retval;
116 int MAX_BUF_SIZE = FWSEND;
117 u32 gpio_oe = 0, gpio_da = 0;
119 if (is_cx2388x(state)) {
120 /* Preserve the GPIO OE and output bits */
121 gpio_oe = cx25840_read(client, 0x160);
122 gpio_da = cx25840_read(client, 0x164);
125 if (is_cx231xx(state) && MAX_BUF_SIZE > 16) {
126 v4l_err(client, " Firmware download size changed to 16 bytes max length\n");
127 MAX_BUF_SIZE = 16; /* cx231xx cannot accept more than 16 bytes at a time */
130 if (request_firmware(&fw, fwname, FWDEV(client)) != 0) {
131 v4l_err(client, "unable to open firmware %s\n", fwname);
132 return -EINVAL;
135 start_fw_load(client);
137 buffer[0] = 0x08;
138 buffer[1] = 0x02;
140 size = fw->size;
141 ptr = fw->data;
142 while (size > 0) {
143 int len = min(MAX_BUF_SIZE - 2, size);
145 memcpy(buffer + 2, ptr, len);
147 retval = fw_write(client, buffer, len + 2);
149 if (retval < 0) {
150 release_firmware(fw);
151 return retval;
154 size -= len;
155 ptr += len;
158 end_fw_load(client);
160 size = fw->size;
161 release_firmware(fw);
163 if (is_cx2388x(state)) {
164 /* Restore GPIO configuration after f/w load */
165 cx25840_write(client, 0x160, gpio_oe);
166 cx25840_write(client, 0x164, gpio_da);
169 return check_fw_load(client, size);
172 MODULE_FIRMWARE(CX2388x_FIRMWARE);
173 MODULE_FIRMWARE(CX231xx_FIRMWARE);
174 MODULE_FIRMWARE(CX25840_FIRMWARE);