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/* 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);
}
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