drivers/mfd/wm831x-spi.c

   1 /*
   2  * wm831x-spi.c  --  SPI access for Wolfson WM831x PMICs
   3  *
   4  * Copyright 2009,2010 Wolfson Microelectronics PLC.
   5  *
   6  * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
   7  *
   8  *  This program is free software; you can redistribute  it and/or modify it
   9  *  under  the terms of  the GNU General  Public License as published by the
  10  *  Free Software Foundation;  either version 2 of the  License, or (at your
  11  *  option) any later version.
  12  *
  13  */
  14
  15 #include <linux/kernel.h>
  16 #include <linux/module.h>
  17 #include <linux/of.h>
  18 #include <linux/of_device.h>
  19 #include <linux/pm.h>
  20 #include <linux/spi/spi.h>
  21 #include <linux/regmap.h>
  22 #include <linux/err.h>
  23
  24 #include <linux/mfd/wm831x/core.h>
  25
  26 static int wm831x_spi_probe(struct spi_device *spi)
  27 {
  28         struct wm831x_pdata *pdata = dev_get_platdata(&spi->dev);
  29         const struct spi_device_id *id = spi_get_device_id(spi);
  30         const struct of_device_id *of_id;
  31         struct wm831x *wm831x;
  32         enum wm831x_parent type;
  33         int ret;
  34
  35         if (spi->dev.of_node) {
  36                 of_id = of_match_device(wm831x_of_match, &spi->dev);
  37                 type = (enum wm831x_parent)of_id->data;
  38         } else {
  39                 type = (enum wm831x_parent)id->driver_data;
  40         }
  41
  42         wm831x = devm_kzalloc(&spi->dev, sizeof(struct wm831x), GFP_KERNEL);
  43         if (wm831x == NULL)
  44                 return -ENOMEM;
  45
  46         spi->mode = SPI_MODE_0;
  47
  48         spi_set_drvdata(spi, wm831x);
  49         wm831x->dev = &spi->dev;
  50         wm831x->type = type;
  51
  52         wm831x->regmap = devm_regmap_init_spi(spi, &wm831x_regmap_config);
  53         if (IS_ERR(wm831x->regmap)) {
  54                 ret = PTR_ERR(wm831x->regmap);
  55                 dev_err(wm831x->dev, "Failed to allocate register map: %d\n",
  56                         ret);
  57                 return ret;
  58         }
  59
  60         if (pdata)
  61                 memcpy(&wm831x->pdata, pdata, sizeof(*pdata));
  62
  63         return wm831x_device_init(wm831x, spi->irq);
  64 }
  65
  66 static int wm831x_spi_remove(struct spi_device *spi)
  67 {
  68         struct wm831x *wm831x = spi_get_drvdata(spi);
  69
  70         wm831x_device_exit(wm831x);
  71
  72         return 0;
  73 }
  74
  75 static int wm831x_spi_suspend(struct device *dev)
  76 {
  77         struct wm831x *wm831x = dev_get_drvdata(dev);
  78
  79         return wm831x_device_suspend(wm831x);
  80 }
  81
  82 static int wm831x_spi_poweroff(struct device *dev)
  83 {
  84         struct wm831x *wm831x = dev_get_drvdata(dev);
  85
  86         wm831x_device_shutdown(wm831x);
  87
  88         return 0;
  89 }
  90
  91 static const struct dev_pm_ops wm831x_spi_pm = {
  92         .freeze = wm831x_spi_suspend,
  93         .suspend = wm831x_spi_suspend,
  94         .poweroff = wm831x_spi_poweroff,
  95 };
  96
  97 static const struct spi_device_id wm831x_spi_ids[] = {
  98         { "wm8310", WM8310 },
  99         { "wm8311", WM8311 },
 100         { "wm8312", WM8312 },
 101         { "wm8320", WM8320 },
 102         { "wm8321", WM8321 },
 103         { "wm8325", WM8325 },
 104         { "wm8326", WM8326 },
 105         { },
 106 };
 107 MODULE_DEVICE_TABLE(spi, wm831x_spi_ids);
 108
 109 static struct spi_driver wm831x_spi_driver = {
 110         .driver = {
 111                 .name   = "wm831x",
 112                 .pm     = &wm831x_spi_pm,
 113                 .of_match_table = of_match_ptr(wm831x_of_match),
 114         },
 115         .id_table       = wm831x_spi_ids,
 116         .probe          = wm831x_spi_probe,
 117         .remove         = wm831x_spi_remove,
 118 };
 119
 120 static int __init wm831x_spi_init(void)
 121 {
 122         int ret;
 123
 124         ret = spi_register_driver(&wm831x_spi_driver);
 125         if (ret != 0)
 126                 pr_err("Failed to register WM831x SPI driver: %d\n", ret);
 127
 128         return 0;
 129 }
 130 subsys_initcall(wm831x_spi_init);
 131
 132 static void __exit wm831x_spi_exit(void)
 133 {
 134         spi_unregister_driver(&wm831x_spi_driver);
 135 }
 136 module_exit(wm831x_spi_exit);
 137
 138 MODULE_DESCRIPTION("SPI support for WM831x/2x AudioPlus PMICs");
 139 MODULE_LICENSE("GPL");
 140 MODULE_AUTHOR("Mark Brown");