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mfd: arizona: SPI bus interface

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Several forthcoming Wolfson devices are based on a common platform
known as Arizona allowing a great deal of reuse of driver code. This
patch adds SPI bus interface code for the devices.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Mark Brown 2012-06-19 16:36:18 +01:00
parent c6f756223a
commit a15123c708
1 changed files with 91 additions and 0 deletions
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91
drivers/mfd/arizona-spi.c Normal file
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/*
* arizona-spi.c -- Arizona SPI bus interface
*
* Copyright 2012 Wolfson Microelectronics plc
*
* Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/err.h>
#include <linux/module.h>
#include <linux/pm_runtime.h>
#include <linux/regmap.h>
#include <linux/regulator/consumer.h>
#include <linux/slab.h>
#include <linux/spi/spi.h>
#include <linux/mfd/arizona/core.h>
#include "arizona.h"
static int __devinit arizona_spi_probe(struct spi_device *spi)
{
const struct spi_device_id *id = spi_get_device_id(spi);
struct arizona *arizona;
const struct regmap_config *regmap_config;
int ret;
switch (id->driver_data) {
#ifdef CONFIG_MFD_WM5102
case WM5102:
regmap_config = &wm5102_spi_regmap;
break;
#endif
default:
dev_err(&spi->dev, "Unknown device type %ld\n",
id->driver_data);
return -EINVAL;
}
arizona = devm_kzalloc(&spi->dev, sizeof(*arizona), GFP_KERNEL);
if (arizona == NULL)
return -ENOMEM;
arizona->regmap = devm_regmap_init_spi(spi, regmap_config);
if (IS_ERR(arizona->regmap)) {
ret = PTR_ERR(arizona->regmap);
dev_err(&spi->dev, "Failed to allocate register map: %d\n",
ret);
return ret;
}
arizona->type = id->driver_data;
arizona->dev = &spi->dev;
arizona->irq = spi->irq;
return arizona_dev_init(arizona);
}
static int __devexit arizona_spi_remove(struct spi_device *spi)
{
struct arizona *arizona = dev_get_drvdata(&spi->dev);
arizona_dev_exit(arizona);
return 0;
}
static const struct spi_device_id arizona_spi_ids[] = {
{ "wm5102", WM5102 },
{ },
};
MODULE_DEVICE_TABLE(spi, arizona_spi_ids);
static struct spi_driver arizona_spi_driver = {
.driver = {
.name = "arizona",
.owner = THIS_MODULE,
.pm = &arizona_pm_ops,
},
.probe = arizona_spi_probe,
.remove = __devexit_p(arizona_spi_remove),
.id_table = arizona_spi_ids,
};
module_spi_driver(arizona_spi_driver);
MODULE_DESCRIPTION("Arizona SPI bus interface");
MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
MODULE_LICENSE("GPL");