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153 lines
3.2 KiB
153 lines
3.2 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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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 <[email protected]> |
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* Andrzej Hajda <[email protected]> |
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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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