LXR linux/drivers/mfd/da9052-spi.c

   1/*
   2 * SPI access for Dialog DA9052 PMICs.
   3 *
   4 * Copyright(c) 2011 Dialog Semiconductor Ltd.
   5 *
   6 * Author: David Dajun Chen <dchen@diasemi.com>
   7 *
   8 * This program is free software; you can redistribute it and/or modify
   9 * it under the terms of the GNU General Public License as published by
  10 * the Free Software Foundation; either version 2 of the License, or
  11 * (at your option) any later version.
  12 *
  13 */
  14
  15#include <linux/device.h>
  16#include <linux/module.h>
  17#include <linux/input.h>
  18#include <linux/mfd/core.h>
  19#include <linux/spi/spi.h>
  20#include <linux/err.h>
  21
  22#include <linux/mfd/da9052/da9052.h>
  23
  24static int da9052_spi_probe(struct spi_device *spi)
  25{
  26        int ret;
  27        const struct spi_device_id *id = spi_get_device_id(spi);
  28        struct da9052 *da9052;
  29
  30        da9052 = devm_kzalloc(&spi->dev, sizeof(struct da9052), GFP_KERNEL);
  31        if (!da9052)
  32                return -ENOMEM;
  33
  34        spi->mode = SPI_MODE_0 | SPI_CPOL;
  35        spi->bits_per_word = 8;
  36        spi_setup(spi);
  37
  38        da9052->dev = &spi->dev;
  39        da9052->chip_irq = spi->irq;
  40
  41        spi_set_drvdata(spi, da9052);
  42
  43        da9052_regmap_config.read_flag_mask = 1;
  44        da9052_regmap_config.write_flag_mask = 0;
  45
  46        da9052->regmap = devm_regmap_init_spi(spi, &da9052_regmap_config);
  47        if (IS_ERR(da9052->regmap)) {
  48                ret = PTR_ERR(da9052->regmap);
  49                dev_err(&spi->dev, "Failed to allocate register map: %d\n",
  50                        ret);
  51                return ret;
  52        }
  53
  54        ret = da9052_device_init(da9052, id->driver_data);
  55        if (ret != 0)
  56                return ret;
  57
  58        return 0;
  59}
  60
  61static int da9052_spi_remove(struct spi_device *spi)
  62{
  63        struct da9052 *da9052 = spi_get_drvdata(spi);
  64
  65        da9052_device_exit(da9052);
  66        return 0;
  67}
  68
  69static struct spi_device_id da9052_spi_id[] = {
  70        {"da9052", DA9052},
  71        {"da9053-aa", DA9053_AA},
  72        {"da9053-ba", DA9053_BA},
  73        {"da9053-bb", DA9053_BB},
  74        {}
  75};
  76
  77static struct spi_driver da9052_spi_driver = {
  78        .probe = da9052_spi_probe,
  79        .remove = da9052_spi_remove,
  80        .id_table = da9052_spi_id,
  81        .driver = {
  82                .name = "da9052",
  83                .owner = THIS_MODULE,
  84        },
  85};
  86
  87static int __init da9052_spi_init(void)
  88{
  89        int ret;
  90
  91        ret = spi_register_driver(&da9052_spi_driver);
  92        if (ret != 0) {
  93                pr_err("Failed to register DA9052 SPI driver, %d\n", ret);
  94                return ret;
  95        }
  96
  97        return 0;
  98}
  99subsys_initcall(da9052_spi_init);
 100
 101static void __exit da9052_spi_exit(void)
 102{
 103        spi_unregister_driver(&da9052_spi_driver);
 104}
 105module_exit(da9052_spi_exit);
 106
 107MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
 108MODULE_DESCRIPTION("SPI driver for Dialog DA9052 PMIC");
 109MODULE_LICENSE("GPL");
 110