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        struct regmap_config config;
  27        int ret;
  28        const struct spi_device_id *id = spi_get_device_id(spi);
  29        struct da9052 *da9052;
  30
  31        da9052 = devm_kzalloc(&spi->dev, sizeof(struct da9052), GFP_KERNEL);
  32        if (!da9052)
  33                return -ENOMEM;
  34
  35        spi->mode = SPI_MODE_0;
  36        spi->bits_per_word = 8;
  37        spi_setup(spi);
  38
  39        da9052->dev = &spi->dev;
  40        da9052->chip_irq = spi->irq;
  41
  42        spi_set_drvdata(spi, da9052);
  43
  44        config = da9052_regmap_config;
  45        config.read_flag_mask = 1;
  46        config.reg_bits = 7;
  47        config.pad_bits = 1;
  48        config.val_bits = 8;
  49        config.use_single_rw = 1;
  50
  51        da9052->regmap = devm_regmap_init_spi(spi, &config);
  52        if (IS_ERR(da9052->regmap)) {
  53                ret = PTR_ERR(da9052->regmap);
  54                dev_err(&spi->dev, "Failed to allocate register map: %d\n",
  55                        ret);
  56                return ret;
  57        }
  58
  59        ret = da9052_device_init(da9052, id->driver_data);
  60        if (ret != 0)
  61                return ret;
  62
  63        return 0;
  64}
  65
  66static int da9052_spi_remove(struct spi_device *spi)
  67{
  68        struct da9052 *da9052 = spi_get_drvdata(spi);
  69
  70        da9052_device_exit(da9052);
  71        return 0;
  72}
  73
  74static struct spi_device_id da9052_spi_id[] = {
  75        {"da9052", DA9052},
  76        {"da9053-aa", DA9053_AA},
  77        {"da9053-ba", DA9053_BA},
  78        {"da9053-bb", DA9053_BB},
  79        {"da9053-bc", DA9053_BC},
  80        {}
  81};
  82
  83static struct spi_driver da9052_spi_driver = {
  84        .probe = da9052_spi_probe,
  85        .remove = da9052_spi_remove,
  86        .id_table = da9052_spi_id,
  87        .driver = {
  88                .name = "da9052",
  89                .owner = THIS_MODULE,
  90        },
  91};
  92
  93static int __init da9052_spi_init(void)
  94{
  95        int ret;
  96
  97        ret = spi_register_driver(&da9052_spi_driver);
  98        if (ret != 0) {
  99                pr_err("Failed to register DA9052 SPI driver, %d\n", ret);
 100                return ret;
 101        }
 102
 103        return 0;
 104}
 105subsys_initcall(da9052_spi_init);
 106
 107static void __exit da9052_spi_exit(void)
 108{
 109        spi_unregister_driver(&da9052_spi_driver);
 110}
 111module_exit(da9052_spi_exit);
 112
 113MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
 114MODULE_DESCRIPTION("SPI driver for Dialog DA9052 PMIC");
 115MODULE_LICENSE("GPL");
 116