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