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/drv-intf/cx25840.h>
24 #include "cx25840-core.h"
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.
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);
53 cx25840_write(client, 0x000, 0x20);
56 static void end_fw_load(struct i2c_client *client)
59 cx25840_write(client, 0x000, 0x00);
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));
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);
88 v4l_err(client, "firmware %s load failed\n",
93 v4l_info(client, "loaded %s firmware (%d bytes)\n",
94 get_fw_name(client), size);
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");
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;
114 const char *fwname = get_fw_name(client);
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 /* cx231xx cannot accept more than 16 bytes at a time */
126 if (is_cx231xx(state) && max_buf_size > 16)
129 if (request_firmware(&fw, fwname, FWDEV(client)) != 0) {
130 v4l_err(client, "unable to open firmware %s\n", fwname);
134 start_fw_load(client);
142 int len = min(max_buf_size - 2, size);
144 memcpy(buffer + 2, ptr, len);
146 retval = fw_write(client, buffer, len + 2);
149 release_firmware(fw);
160 release_firmware(fw);
162 if (is_cx2388x(state)) {
163 /* Restore GPIO configuration after f/w load */
164 cx25840_write(client, 0x160, gpio_oe);
165 cx25840_write(client, 0x164, gpio_da);
168 return check_fw_load(client, size);
171 MODULE_FIRMWARE(CX2388x_FIRMWARE);
172 MODULE_FIRMWARE(CX231xx_FIRMWARE);
173 MODULE_FIRMWARE(CX25840_FIRMWARE);