| /* 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" |
| |
| #define FWFILE "v4l-cx25840.fw" |
| |
| /* |
| * 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 = FWFILE; |
| |
| module_param(firmware, charp, 0444); |
| |
| MODULE_PARM_DESC(firmware, "Firmware image [default: " FWFILE "]"); |
| |
| 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 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", firmware); |
| return -EINVAL; |
| } |
| |
| v4l_info(client, "loaded %s firmware (%d bytes)\n", firmware, size); |
| return 0; |
| } |
| |
| static int fw_write(struct i2c_client *client, u8 * data, int size) |
| { |
| int sent; |
| |
| if ((sent = 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) |
| { |
| const struct firmware *fw = NULL; |
| u8 buffer[4], *ptr; |
| int size, send, retval; |
| |
| if (request_firmware(&fw, firmware, FWDEV(client)) != 0) { |
| v4l_err(client, "unable to open firmware %s\n", firmware); |
| return -EINVAL; |
| } |
| |
| start_fw_load(client); |
| |
| buffer[0] = 0x08; |
| buffer[1] = 0x02; |
| buffer[2] = fw->data[0]; |
| buffer[3] = fw->data[1]; |
| retval = fw_write(client, buffer, 4); |
| |
| if (retval < 0) { |
| release_firmware(fw); |
| return retval; |
| } |
| |
| size = fw->size - 2; |
| ptr = fw->data; |
| while (size > 0) { |
| ptr[0] = 0x08; |
| ptr[1] = 0x02; |
| send = size > (FWSEND - 2) ? FWSEND : size + 2; |
| retval = fw_write(client, ptr, send); |
| |
| if (retval < 0) { |
| release_firmware(fw); |
| return retval; |
| } |
| |
| size -= FWSEND - 2; |
| ptr += FWSEND - 2; |
| } |
| |
| end_fw_load(client); |
| |
| size = fw->size; |
| release_firmware(fw); |
| |
| return check_fw_load(client, size); |
| } |