mirror of https://gitee.com/openkylin/linux.git
142 lines
3.5 KiB
C
142 lines
3.5 KiB
C
/* cx25840 firmware functions
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#include <linux/module.h>
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#include <linux/i2c.h>
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#include <linux/i2c-algo-bit.h>
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#include <linux/firmware.h>
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#include <media/v4l2-common.h>
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#include <media/cx25840.h>
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#include "cx25840-core.h"
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#define FWFILE "v4l-cx25840.fw"
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/*
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* Mike Isely <isely@pobox.com> - The FWSEND parameter controls the
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* size of the firmware chunks sent down the I2C bus to the chip.
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* Previously this had been set to 1024 but unfortunately some I2C
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* implementations can't transfer data in such big gulps.
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* Specifically, the pvrusb2 driver has a hard limit of around 60
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* bytes, due to the encapsulation there of I2C traffic into USB
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* messages. So we have to significantly reduce this parameter.
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*/
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#define FWSEND 48
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#define FWDEV(x) &((x)->adapter->dev)
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static char *firmware = FWFILE;
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module_param(firmware, charp, 0444);
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MODULE_PARM_DESC(firmware, "Firmware image [default: " FWFILE "]");
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static void start_fw_load(struct i2c_client *client)
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{
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/* DL_ADDR_LB=0 DL_ADDR_HB=0 */
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cx25840_write(client, 0x800, 0x00);
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cx25840_write(client, 0x801, 0x00);
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// DL_MAP=3 DL_AUTO_INC=0 DL_ENABLE=1
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cx25840_write(client, 0x803, 0x0b);
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/* AUTO_INC_DIS=1 */
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cx25840_write(client, 0x000, 0x20);
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}
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static void end_fw_load(struct i2c_client *client)
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{
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/* AUTO_INC_DIS=0 */
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cx25840_write(client, 0x000, 0x00);
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/* DL_ENABLE=0 */
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cx25840_write(client, 0x803, 0x03);
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}
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static int check_fw_load(struct i2c_client *client, int size)
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{
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/* DL_ADDR_HB DL_ADDR_LB */
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int s = cx25840_read(client, 0x801) << 8;
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s |= cx25840_read(client, 0x800);
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if (size != s) {
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v4l_err(client, "firmware %s load failed\n", firmware);
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return -EINVAL;
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}
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v4l_info(client, "loaded %s firmware (%d bytes)\n", firmware, size);
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return 0;
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}
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static int fw_write(struct i2c_client *client, u8 * data, int size)
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{
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int sent;
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if ((sent = i2c_master_send(client, data, size)) < size) {
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v4l_err(client, "firmware load i2c failure\n");
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return -ENOSYS;
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}
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return 0;
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}
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int cx25840_loadfw(struct i2c_client *client)
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{
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const struct firmware *fw = NULL;
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u8 buffer[4], *ptr;
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int size, send, retval;
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if (request_firmware(&fw, firmware, FWDEV(client)) != 0) {
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v4l_err(client, "unable to open firmware %s\n", firmware);
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return -EINVAL;
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}
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start_fw_load(client);
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buffer[0] = 0x08;
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buffer[1] = 0x02;
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buffer[2] = fw->data[0];
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buffer[3] = fw->data[1];
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retval = fw_write(client, buffer, 4);
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if (retval < 0) {
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release_firmware(fw);
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return retval;
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}
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size = fw->size - 2;
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ptr = fw->data;
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while (size > 0) {
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ptr[0] = 0x08;
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ptr[1] = 0x02;
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send = size > (FWSEND - 2) ? FWSEND : size + 2;
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retval = fw_write(client, ptr, send);
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if (retval < 0) {
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release_firmware(fw);
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return retval;
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}
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size -= FWSEND - 2;
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ptr += FWSEND - 2;
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}
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end_fw_load(client);
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size = fw->size;
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release_firmware(fw);
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return check_fw_load(client, size);
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}
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