From 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 Mon Sep 17 00:00:00 2001 From: Yunhong Jiang Date: Tue, 4 Aug 2015 12:17:53 -0700 Subject: Add the rt linux 4.1.3-rt3 as base Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang --- kernel/drivers/media/i2c/s5c73m3/s5c73m3-spi.c | 162 +++++++++++++++++++++++++ 1 file changed, 162 insertions(+) create mode 100644 kernel/drivers/media/i2c/s5c73m3/s5c73m3-spi.c (limited to 'kernel/drivers/media/i2c/s5c73m3/s5c73m3-spi.c') diff --git a/kernel/drivers/media/i2c/s5c73m3/s5c73m3-spi.c b/kernel/drivers/media/i2c/s5c73m3/s5c73m3-spi.c new file mode 100644 index 000000000..63eb19093 --- /dev/null +++ b/kernel/drivers/media/i2c/s5c73m3/s5c73m3-spi.c @@ -0,0 +1,162 @@ +/* + * Samsung LSI S5C73M3 8M pixel camera driver + * + * Copyright (C) 2012, Samsung Electronics, Co., Ltd. + * Sylwester Nawrocki + * Andrzej Hajda + * + * 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 +#include +#include +#include +#include +#include +#include + +#include "s5c73m3.h" + +#define S5C73M3_SPI_DRV_NAME "S5C73M3-SPI" + +static const struct of_device_id s5c73m3_spi_ids[] = { + { .compatible = "samsung,s5c73m3" }, + { } +}; + +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) { + pr_err("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; + spidrv->driver.of_match_table = s5c73m3_spi_ids; + + return spi_register_driver(spidrv); +} + +void s5c73m3_unregister_spi_driver(struct s5c73m3 *state) +{ + spi_unregister_driver(&state->spidrv); +} -- cgit 1.2.3-korg