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 = 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;
  56
  57         return 0;
  58
  59 err:
  60         kfree(da9052);
  61         return ret;
  62 }
  63
  64 static int da9052_spi_remove(struct spi_device *spi)
  65 {
  66         struct da9052 *da9052 = dev_get_drvdata(&spi->dev);
  67
  68         da9052_device_exit(da9052);
  69         kfree(da9052);
  70
  71         return 0;
  72 }
  73
  74 static 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         {}
  80 };
  81
  82 static struct spi_driver da9052_spi_driver = {
  83         .probe = da9052_spi_probe,
  84         .remove = __devexit_p(da9052_spi_remove),
  85         .id_table = da9052_spi_id,
  86         .driver = {
  87                 .name = "da9052",
  88                 .bus = &spi_bus_type,
  89                 .owner = THIS_MODULE,
  90         },
  91 };
  92
  93 static 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 }
 105 subsys_initcall(da9052_spi_init);
 106
 107 static void __exit da9052_spi_exit(void)
 108 {
 109         spi_unregister_driver(&da9052_spi_driver);
 110 }
 111 module_exit(da9052_spi_exit);
 112
 113 MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
 114 MODULE_DESCRIPTION("SPI driver for Dialog DA9052 PMIC");
 115 MODULE_LICENSE("GPL");