mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-25 21:54:06 +08:00
5da721c87a
In systems where there is no hardware signal from the processor to the PMIC to initiate the final power off sequence we must initiate the shutdown with a register write to the PMIC. Support such systems in the driver. Since this may prevent a full shutdown of the system platform data is used to enable the feature. Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
129 lines
2.9 KiB
C
129 lines
2.9 KiB
C
/*
|
|
* wm831x-spi.c -- SPI access for Wolfson WM831x PMICs
|
|
*
|
|
* Copyright 2009,2010 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 as published by the
|
|
* Free Software Foundation; either version 2 of the License, or (at your
|
|
* option) any later version.
|
|
*
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.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 __devinit wm831x_spi_probe(struct spi_device *spi)
|
|
{
|
|
const struct spi_device_id *id = spi_get_device_id(spi);
|
|
struct wm831x *wm831x;
|
|
enum wm831x_parent type;
|
|
int ret;
|
|
|
|
type = (enum wm831x_parent)id->driver_data;
|
|
|
|
wm831x = kzalloc(sizeof(struct wm831x), GFP_KERNEL);
|
|
if (wm831x == NULL)
|
|
return -ENOMEM;
|
|
|
|
spi->bits_per_word = 16;
|
|
spi->mode = SPI_MODE_0;
|
|
|
|
dev_set_drvdata(&spi->dev, wm831x);
|
|
wm831x->dev = &spi->dev;
|
|
|
|
wm831x->regmap = 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);
|
|
kfree(wm831x);
|
|
return ret;
|
|
}
|
|
|
|
return wm831x_device_init(wm831x, type, spi->irq);
|
|
}
|
|
|
|
static int __devexit wm831x_spi_remove(struct spi_device *spi)
|
|
{
|
|
struct wm831x *wm831x = dev_get_drvdata(&spi->dev);
|
|
|
|
wm831x_device_exit(wm831x);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int wm831x_spi_suspend(struct device *dev)
|
|
{
|
|
struct wm831x *wm831x = dev_get_drvdata(dev);
|
|
|
|
return wm831x_device_suspend(wm831x);
|
|
}
|
|
|
|
static void wm831x_spi_shutdown(struct spi_device *spi)
|
|
{
|
|
struct wm831x *wm831x = dev_get_drvdata(&spi->dev);
|
|
|
|
wm831x_device_shutdown(wm831x);
|
|
}
|
|
|
|
static const struct dev_pm_ops wm831x_spi_pm = {
|
|
.freeze = wm831x_spi_suspend,
|
|
.suspend = wm831x_spi_suspend,
|
|
};
|
|
|
|
static const struct spi_device_id wm831x_spi_ids[] = {
|
|
{ "wm8310", WM8310 },
|
|
{ "wm8311", WM8311 },
|
|
{ "wm8312", WM8312 },
|
|
{ "wm8320", WM8320 },
|
|
{ "wm8321", WM8321 },
|
|
{ "wm8325", WM8325 },
|
|
{ "wm8326", WM8326 },
|
|
{ },
|
|
};
|
|
MODULE_DEVICE_TABLE(spi, wm831x_spi_id);
|
|
|
|
static struct spi_driver wm831x_spi_driver = {
|
|
.driver = {
|
|
.name = "wm831x",
|
|
.bus = &spi_bus_type,
|
|
.owner = THIS_MODULE,
|
|
.pm = &wm831x_spi_pm,
|
|
},
|
|
.id_table = wm831x_spi_ids,
|
|
.probe = wm831x_spi_probe,
|
|
.remove = __devexit_p(wm831x_spi_remove),
|
|
.shutdown = wm831x_spi_shutdown,
|
|
};
|
|
|
|
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);
|
|
|
|
static void __exit wm831x_spi_exit(void)
|
|
{
|
|
spi_unregister_driver(&wm831x_spi_driver);
|
|
}
|
|
module_exit(wm831x_spi_exit);
|
|
|
|
MODULE_DESCRIPTION("SPI support for WM831x/2x AudioPlus PMICs");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Mark Brown");
|