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
  24 static 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         dev_set_drvdata(&spi->dev, 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
  61 static int da9052_spi_remove(struct spi_device *spi)
  62 {
  63         struct da9052 *da9052 = dev_get_drvdata(&spi->dev);
  64
  65         da9052_device_exit(da9052);
  66         return 0;
  67 }
  68
  69 static 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
  77 static 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
  87 static 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 }
  99 subsys_initcall(da9052_spi_init);
 100
 101 static void __exit da9052_spi_exit(void)
 102 {
 103         spi_unregister_driver(&da9052_spi_driver);
 104 }
 105 module_exit(da9052_spi_exit);
 106
 107 MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
 108 MODULE_DESCRIPTION("SPI driver for Dialog DA9052 PMIC");
 109 MODULE_LICENSE("GPL");