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/*
* Samsung LSI S5C73M3 8M pixel camera driver
*
* Copyright (C) 2012, Samsung Electronics, Co., Ltd.
* Sylwester Nawrocki <s.nawrocki@samsung.com>
* Andrzej Hajda <a.hajda@samsung.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* version 2 as published by the Free Software Foundation.
*
* 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.
*/
#include <linux/sizes.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/media.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/spi/spi.h>
#include "s5c73m3.h"
#define S5C73M3_SPI_DRV_NAME "S5C73M3-SPI"
enum spi_direction {
SPI_DIR_RX,
SPI_DIR_TX
};
static int spi_xmit(struct spi_device *spi_dev, void *addr, const int len,
enum spi_direction dir)
{
struct spi_message msg;
int r;
struct spi_transfer xfer = {
.len = len,
};
if (dir == SPI_DIR_TX)
xfer.tx_buf = addr;
else
xfer.rx_buf = addr;
if (spi_dev == NULL) {
dev_err(&spi_dev->dev, "SPI device is uninitialized\n");
return -ENODEV;
}
spi_message_init(&msg);
spi_message_add_tail(&xfer, &msg);
r = spi_sync(spi_dev, &msg);
if (r < 0)
dev_err(&spi_dev->dev, "%s spi_sync failed %d\n", __func__, r);
return r;
}
int s5c73m3_spi_write(struct s5c73m3 *state, const void *addr,
const unsigned int len, const unsigned int tx_size)
{
struct spi_device *spi_dev = state->spi_dev;
u32 count = len / tx_size;
u32 extra = len % tx_size;
unsigned int i, j = 0;
u8 padding[32];
int r = 0;
memset(padding, 0, sizeof(padding));
for (i = 0; i < count; i++) {
r = spi_xmit(spi_dev, (void *)addr + j, tx_size, SPI_DIR_TX);
if (r < 0)
return r;
j += tx_size;
}
if (extra > 0) {
r = spi_xmit(spi_dev, (void *)addr + j, extra, SPI_DIR_TX);
if (r < 0)
return r;
}
return spi_xmit(spi_dev, padding, sizeof(padding), SPI_DIR_TX);
}
int s5c73m3_spi_read(struct s5c73m3 *state, void *addr,
const unsigned int len, const unsigned int tx_size)
{
struct spi_device *spi_dev = state->spi_dev;
u32 count = len / tx_size;
u32 extra = len % tx_size;
unsigned int i, j = 0;
int r = 0;
for (i = 0; i < count; i++) {
r = spi_xmit(spi_dev, addr + j, tx_size, SPI_DIR_RX);
if (r < 0)
return r;
j += tx_size;
}
if (extra > 0)
return spi_xmit(spi_dev, addr + j, extra, SPI_DIR_RX);
return 0;
}
static int s5c73m3_spi_probe(struct spi_device *spi)
{
int r;
struct s5c73m3 *state = container_of(spi->dev.driver, struct s5c73m3,
spidrv.driver);
spi->bits_per_word = 32;
r = spi_setup(spi);
if (r < 0) {
dev_err(&spi->dev, "spi_setup() failed\n");
return r;
}
mutex_lock(&state->lock);
state->spi_dev = spi;
mutex_unlock(&state->lock);
v4l2_info(&state->sensor_sd, "S5C73M3 SPI probed successfully\n");
return 0;
}
static int s5c73m3_spi_remove(struct spi_device *spi)
{
return 0;
}
int s5c73m3_register_spi_driver(struct s5c73m3 *state)
{
struct spi_driver *spidrv = &state->spidrv;
spidrv->remove = s5c73m3_spi_remove;
spidrv->probe = s5c73m3_spi_probe;
spidrv->driver.name = S5C73M3_SPI_DRV_NAME;
spidrv->driver.bus = &spi_bus_type;
spidrv->driver.owner = THIS_MODULE;
return spi_register_driver(spidrv);
}
void s5c73m3_unregister_spi_driver(struct s5c73m3 *state)
{
spi_unregister_driver(&state->spidrv);
}
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