SSL wm831x-spi.c   Interaktion und
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// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * wm831x-spi.c  --  SPI access for Wolfson WM831x PMICs
 *
 * Copyright 2009,2010 Wolfson Microelectronics PLC.
 *
 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
 */

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/of.h>
#include <linux/pm.h>
#include <linux/spi/spi.h>
#include <linux/regmap.h>
#include <linux/err.h>

#include <linux/mfd/wm831x/core.h>

static int wm831x_spi_probe(struct spi_device *spi)
{
 struct wm831x_pdata *pdata = dev_get_platdata(&spi->dev);
 struct wm831x *wm831x;
 enum wm831x_parent type;
 int ret;

 type = (uintptr_t)spi_get_device_match_data(spi);
 if (!type) {
  dev_err(&spi->dev, "Failed to match device\n");
  return -ENODEV;
 }

 wm831x = devm_kzalloc(&spi->dev, sizeof(struct wm831x), GFP_KERNEL);
 if (wm831x == NULL)
  return -ENOMEM;

 spi->mode = SPI_MODE_0;

 spi_set_drvdata(spi, wm831x);
 wm831x->dev = &spi->dev;
 wm831x->type = type;

 wm831x->regmap = devm_regmap_init_spi(spi, &wm831x_regmap_config);
 if (IS_ERR(wm831x->regmap)) {
  ret = PTR_ERR(wm831x->regmap);
  dev_err(wm831x->dev, "Failed to allocate register map: %d\n",
   ret);
  return ret;
 }

 if (pdata)
  memcpy(&wm831x->pdata, pdata, sizeof(*pdata));

 return wm831x_device_init(wm831x, spi->irq);
}

static int wm831x_spi_suspend(struct device *dev)
{
 struct wm831x *wm831x = dev_get_drvdata(dev);

 return wm831x_device_suspend(wm831x);
}

static int wm831x_spi_poweroff(struct device *dev)
{
 struct wm831x *wm831x = dev_get_drvdata(dev);

 wm831x_device_shutdown(wm831x);

 return 0;
}

static const struct dev_pm_ops wm831x_spi_pm = {
 .freeze = wm831x_spi_suspend,
 .suspend = wm831x_spi_suspend,
 .poweroff = wm831x_spi_poweroff,
};

static const struct spi_device_id wm831x_spi_ids[] = {
 { "wm8310", WM8310 },
 { "wm8311", WM8311 },
 { "wm8312", WM8312 },
 { "wm8320", WM8320 },
 { "wm8321", WM8321 },
 { "wm8325", WM8325 },
 { "wm8326", WM8326 },
 { },
};

static struct spi_driver wm831x_spi_driver = {
 .driver = {
  .name = "wm831x",
  .pm = &wm831x_spi_pm,
  .of_match_table = of_match_ptr(wm831x_of_match),
  .suppress_bind_attrs = true,
 },
 .id_table = wm831x_spi_ids,
 .probe  = wm831x_spi_probe,
};

static int __init wm831x_spi_init(void)
{
 int ret;

 ret = spi_register_driver(&wm831x_spi_driver);
 if (ret != 0)
  pr_err("Failed to register WM831x SPI driver: %d\n", ret);

 return 0;
}
subsys_initcall(wm831x_spi_init);