diff options
Diffstat (limited to 'drivers/media/video/cx25840/cx25840-firmware.c')
| -rw-r--r-- | drivers/media/video/cx25840/cx25840-firmware.c | 137 |
1 files changed, 137 insertions, 0 deletions
diff --git a/drivers/media/video/cx25840/cx25840-firmware.c b/drivers/media/video/cx25840/cx25840-firmware.c new file mode 100644 index 0000000..8d489a4 --- /dev/null +++ b/drivers/media/video/cx25840/cx25840-firmware.c @@ -0,0 +1,137 @@ +/* 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" +#define FWFILE_CX23885 "v4l-cx23885-avcore-01.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, 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 = i2c_get_clientdata(client); + const struct firmware *fw = NULL; + u8 buffer[FWSEND]; + const u8 *ptr; + int size, retval; + + if (state->is_cx23885) + firmware = FWFILE_CX23885; + + 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; + + size = fw->size; + ptr = fw->data; + while (size > 0) { + int len = min(FWSEND - 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); + + return check_fw_load(client, size); +} |
