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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 | // SPDX-License-Identifier: GPL-2.0-only /* * 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> */ #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" static const struct of_device_id s5c73m3_spi_ids[] = { { .compatible = "samsung,s5c73m3" }, { } }; MODULE_DEVICE_TABLE(of, s5c73m3_spi_ids); 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; } int s5c73m3_register_spi_driver(struct s5c73m3 *state) { struct spi_driver *spidrv = &state->spidrv; spidrv->probe = s5c73m3_spi_probe; spidrv->driver.name = S5C73M3_SPI_DRV_NAME; 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); } |