drivers/mfd/wm831x-spi.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * wm831x-spi.c  --  SPI access for Wolfson WM831x PMICs
   4  *
   5  * Copyright 2009,2010 Wolfson Microelectronics PLC.
   6  *
   7  * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
   8  */
   9
  10 #include <linux/kernel.h>
  11 #include <linux/init.h>
  12 #include <linux/of.h>
  13 #include <linux/pm.h>
  14 #include <linux/spi/spi.h>
  15 #include <linux/regmap.h>
  16 #include <linux/err.h>
  17
  18 #include <linux/mfd/wm831x/core.h>
  19
  20 static int wm831x_spi_probe(struct spi_device *spi)
  21 {
  22         struct wm831x_pdata *pdata = dev_get_platdata(&spi->dev);
  23         struct wm831x *wm831x;
  24         enum wm831x_parent type;
  25         int ret;
  26
  27         type = (uintptr_t)spi_get_device_match_data(spi);
  28         if (!type) {
  29                 dev_err(&spi->dev, "Failed to match device\n");
  30                 return -ENODEV;
  31         }
  32
  33         wm831x = devm_kzalloc(&spi->dev, sizeof(struct wm831x), GFP_KERNEL);
  34         if (wm831x == NULL)
  35                 return -ENOMEM;
  36
  37         spi->mode = SPI_MODE_0;
  38
  39         spi_set_drvdata(spi, wm831x);
  40         wm831x->dev = &spi->dev;
  41         wm831x->type = type;
  42
  43         wm831x->regmap = devm_regmap_init_spi(spi, &wm831x_regmap_config);
  44         if (IS_ERR(wm831x->regmap)) {
  45                 ret = PTR_ERR(wm831x->regmap);
  46                 dev_err(wm831x->dev, "Failed to allocate register map: %d\n",
  47                         ret);
  48                 return ret;
  49         }
  50
  51         if (pdata)
  52                 memcpy(&wm831x->pdata, pdata, sizeof(*pdata));
  53
  54         return wm831x_device_init(wm831x, spi->irq);
  55 }
  56
  57 static int wm831x_spi_suspend(struct device *dev)
  58 {
  59         struct wm831x *wm831x = dev_get_drvdata(dev);
  60
  61         return wm831x_device_suspend(wm831x);
  62 }
  63
  64 static int wm831x_spi_poweroff(struct device *dev)
  65 {
  66         struct wm831x *wm831x = dev_get_drvdata(dev);
  67
  68         wm831x_device_shutdown(wm831x);
  69
  70         return 0;
  71 }
  72
  73 static const struct dev_pm_ops wm831x_spi_pm = {
  74         .freeze = wm831x_spi_suspend,
  75         .suspend = wm831x_spi_suspend,
  76         .poweroff = wm831x_spi_poweroff,
  77 };
  78
  79 static const struct spi_device_id wm831x_spi_ids[] = {
  80         { "wm8310", WM8310 },
  81         { "wm8311", WM8311 },
  82         { "wm8312", WM8312 },
  83         { "wm8320", WM8320 },
  84         { "wm8321", WM8321 },
  85         { "wm8325", WM8325 },
  86         { "wm8326", WM8326 },
  87         { },
  88 };
  89
  90 static struct spi_driver wm831x_spi_driver = {
  91         .driver = {
  92                 .name   = "wm831x",
  93                 .pm     = &wm831x_spi_pm,
  94                 .of_match_table = of_match_ptr(wm831x_of_match),
  95                 .suppress_bind_attrs = true,
  96         },
  97         .id_table       = wm831x_spi_ids,
  98         .probe          = wm831x_spi_probe,
  99 };
 100
 101 static int __init wm831x_spi_init(void)
 102 {
 103         int ret;
 104
 105         ret = spi_register_driver(&wm831x_spi_driver);
 106         if (ret != 0)
 107                 pr_err("Failed to register WM831x SPI driver: %d\n", ret);
 108
 109         return 0;
 110 }
 111 subsys_initcall(wm831x_spi_init);