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"
26 #define FWFILE "v4l-cx25840.fw"
27 #define FWFILE_CX23885 "v4l-cx23885-avcore-01.fw"
28 #define FWFILE_CX231XX "v4l-cx231xx-avcore-01.fw"
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.
41 #define FWDEV(x) &((x)->dev)
43 static char *firmware = FWFILE;
45 module_param(firmware, charp, 0444);
47 MODULE_PARM_DESC(firmware, "Firmware image [default: " FWFILE "]");
49 static void start_fw_load(struct i2c_client *client)
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);
57 cx25840_write(client, 0x000, 0x20);
60 static void end_fw_load(struct i2c_client *client)
63 cx25840_write(client, 0x000, 0x00);
65 cx25840_write(client, 0x803, 0x03);
68 static int check_fw_load(struct i2c_client *client, int size)
70 /* DL_ADDR_HB DL_ADDR_LB */
71 int s = cx25840_read(client, 0x801) << 8;
72 s |= cx25840_read(client, 0x800);
75 v4l_err(client, "firmware %s load failed\n", firmware);
79 v4l_info(client, "loaded %s firmware (%d bytes)\n", firmware, size);
83 static int fw_write(struct i2c_client *client, const u8 *data, int size)
85 if (i2c_master_send(client, data, size) < size) {
86 v4l_err(client, "firmware load i2c failure\n");
93 int cx25840_loadfw(struct i2c_client *client)
95 struct cx25840_state *state = to_state(i2c_get_clientdata(client));
96 const struct firmware *fw = NULL;
100 int MAX_BUF_SIZE = FWSEND;
102 if (state->is_cx23885)
103 firmware = FWFILE_CX23885;
104 else if (state->is_cx231xx)
105 firmware = FWFILE_CX231XX;
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 */
112 if (request_firmware(&fw, firmware, FWDEV(client)) != 0) {
113 v4l_err(client, "unable to open firmware %s\n", firmware);
117 start_fw_load(client);
125 int len = min(MAX_BUF_SIZE - 2, size);
127 memcpy(buffer + 2, ptr, len);
129 retval = fw_write(client, buffer, len + 2);
132 release_firmware(fw);
143 release_firmware(fw);
145 return check_fw_load(client, size);