diff options
Diffstat (limited to 'drivers/media/i2c/s5c73m3/s5c73m3-spi.c')
| -rw-r--r-- | drivers/media/i2c/s5c73m3/s5c73m3-spi.c | 156 |
1 files changed, 156 insertions, 0 deletions
diff --git a/drivers/media/i2c/s5c73m3/s5c73m3-spi.c b/drivers/media/i2c/s5c73m3/s5c73m3-spi.c new file mode 100644 index 00000000000..6f3a9c00fe6 --- /dev/null +++ b/drivers/media/i2c/s5c73m3/s5c73m3-spi.c @@ -0,0 +1,156 @@ +/* + * 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); +} |