162 lines
3.6 KiB
C
162 lines
3.6 KiB
C
/*
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* Samsung LSI S5C73M3 8M pixel camera driver
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*
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* Copyright (C) 2012, Samsung Electronics, Co., Ltd.
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* Sylwester Nawrocki <s.nawrocki@samsung.com>
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* Andrzej Hajda <a.hajda@samsung.com>
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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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* version 2 as published by the Free Software Foundation.
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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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#include <linux/sizes.h>
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#include <linux/delay.h>
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#include <linux/init.h>
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#include <linux/media.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/spi/spi.h>
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#include "s5c73m3.h"
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#define S5C73M3_SPI_DRV_NAME "S5C73M3-SPI"
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static const struct of_device_id s5c73m3_spi_ids[] = {
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{ .compatible = "samsung,s5c73m3" },
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{ }
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};
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MODULE_DEVICE_TABLE(of, s5c73m3_spi_ids);
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enum spi_direction {
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SPI_DIR_RX,
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SPI_DIR_TX
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};
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static int spi_xmit(struct spi_device *spi_dev, void *addr, const int len,
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enum spi_direction dir)
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{
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struct spi_message msg;
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int r;
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struct spi_transfer xfer = {
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.len = len,
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};
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if (dir == SPI_DIR_TX)
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xfer.tx_buf = addr;
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else
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xfer.rx_buf = addr;
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if (spi_dev == NULL) {
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pr_err("SPI device is uninitialized\n");
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return -ENODEV;
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}
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spi_message_init(&msg);
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spi_message_add_tail(&xfer, &msg);
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r = spi_sync(spi_dev, &msg);
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if (r < 0)
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dev_err(&spi_dev->dev, "%s spi_sync failed %d\n", __func__, r);
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return r;
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}
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int s5c73m3_spi_write(struct s5c73m3 *state, const void *addr,
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const unsigned int len, const unsigned int tx_size)
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{
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struct spi_device *spi_dev = state->spi_dev;
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u32 count = len / tx_size;
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u32 extra = len % tx_size;
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unsigned int i, j = 0;
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u8 padding[32];
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int r = 0;
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memset(padding, 0, sizeof(padding));
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for (i = 0; i < count; i++) {
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r = spi_xmit(spi_dev, (void *)addr + j, tx_size, SPI_DIR_TX);
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if (r < 0)
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return r;
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j += tx_size;
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}
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if (extra > 0) {
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r = spi_xmit(spi_dev, (void *)addr + j, extra, SPI_DIR_TX);
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if (r < 0)
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return r;
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}
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return spi_xmit(spi_dev, padding, sizeof(padding), SPI_DIR_TX);
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}
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int s5c73m3_spi_read(struct s5c73m3 *state, void *addr,
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const unsigned int len, const unsigned int tx_size)
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{
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struct spi_device *spi_dev = state->spi_dev;
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u32 count = len / tx_size;
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u32 extra = len % tx_size;
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unsigned int i, j = 0;
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int r = 0;
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for (i = 0; i < count; i++) {
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r = spi_xmit(spi_dev, addr + j, tx_size, SPI_DIR_RX);
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if (r < 0)
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return r;
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j += tx_size;
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}
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if (extra > 0)
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return spi_xmit(spi_dev, addr + j, extra, SPI_DIR_RX);
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return 0;
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}
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static int s5c73m3_spi_probe(struct spi_device *spi)
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{
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int r;
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struct s5c73m3 *state = container_of(spi->dev.driver, struct s5c73m3,
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spidrv.driver);
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spi->bits_per_word = 32;
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r = spi_setup(spi);
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if (r < 0) {
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dev_err(&spi->dev, "spi_setup() failed\n");
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return r;
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}
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mutex_lock(&state->lock);
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state->spi_dev = spi;
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mutex_unlock(&state->lock);
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v4l2_info(&state->sensor_sd, "S5C73M3 SPI probed successfully\n");
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return 0;
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}
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static int s5c73m3_spi_remove(struct spi_device *spi)
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{
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return 0;
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}
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int s5c73m3_register_spi_driver(struct s5c73m3 *state)
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{
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struct spi_driver *spidrv = &state->spidrv;
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spidrv->remove = s5c73m3_spi_remove;
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spidrv->probe = s5c73m3_spi_probe;
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spidrv->driver.name = S5C73M3_SPI_DRV_NAME;
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spidrv->driver.of_match_table = s5c73m3_spi_ids;
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return spi_register_driver(spidrv);
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}
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void s5c73m3_unregister_spi_driver(struct s5c73m3 *state)
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{
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spi_unregister_driver(&state->spidrv);
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}
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