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/*
* 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/spi/spi.h>
#include <linux/mfd/wm831x/core.h>
static int wm831x_spi_read_device(struct wm831x *wm831x, unsigned short reg,
int bytes, void *dest)
{
u16 tx_val;
u16 *d = dest;
int r, ret;
/* Go register at a time */
for (r = reg; r < reg + (bytes / 2); r++) {
tx_val = r | 0x8000;
ret = spi_write_then_read(wm831x->control_data,
(u8 *)&tx_val, 2, (u8 *)d, 2);
if (ret != 0)
return ret;
*d = be16_to_cpu(*d);
d++;
}
return 0;
}
static int wm831x_spi_write_device(struct wm831x *wm831x, unsigned short reg,
int bytes, void *src)
{
struct spi_device *spi = wm831x->control_data;
u16 *s = src;
u16 data[2];
int ret, r;
/* Go register at a time */
for (r = reg; r < reg + (bytes / 2); r++) {
data[0] = r;
data[1] = *s++;
ret = spi_write(spi, (char *)&data, sizeof(data));
if (ret != 0)
return ret;
}
return 0;
}
static int __devinit wm831x_spi_probe(struct spi_device *spi)
{
struct wm831x *wm831x;
enum wm831x_parent type;
/* Currently SPI support for ID tables is unmerged, we're faking it */
if (strcmp(spi->modalias, "wm8310") == 0)
type = WM8310;
else if (strcmp(spi->modalias, "wm8311") == 0)
type = WM8311;
else if (strcmp(spi->modalias, "wm8312") == 0)
type = WM8312;
else if (strcmp(spi->modalias, "wm8320") == 0)
type = WM8320;
else if (strcmp(spi->modalias, "wm8321") == 0)
type = WM8321;
else if (strcmp(spi->modalias, "wm8325") == 0)
type = WM8325;
else {
dev_err(&spi->dev, "Unknown device type\n");
return -EINVAL;
}
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->control_data = spi;
wm831x->read_dev = wm831x_spi_read_device;
wm831x->write_dev = wm831x_spi_write_device;
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 spi_device *spi, pm_message_t m)
{
struct wm831x *wm831x = dev_get_drvdata(&spi->dev);
return wm831x_device_suspend(wm831x);
}
static struct spi_driver wm8310_spi_driver = {
.driver = {
.name = "wm8310",
.bus = &spi_bus_type,
.owner = THIS_MODULE,
},
.probe = wm831x_spi_probe,
.remove = __devexit_p(wm831x_spi_remove),
.suspend = wm831x_spi_suspend,
};
static struct spi_driver wm8311_spi_driver = {
.driver = {
.name = "wm8311",
.bus = &spi_bus_type,
.owner = THIS_MODULE,
},
.probe = wm831x_spi_probe,
.remove = __devexit_p(wm831x_spi_remove),
.suspend = wm831x_spi_suspend,
};
static struct spi_driver wm8312_spi_driver = {
.driver = {
.name = "wm8312",
.bus = &spi_bus_type,
.owner = THIS_MODULE,
},
.probe = wm831x_spi_probe,
.remove = __devexit_p(wm831x_spi_remove),
.suspend = wm831x_spi_suspend,
};
static struct spi_driver wm8320_spi_driver = {
.driver = {
.name = "wm8320",
.bus = &spi_bus_type,
.owner = THIS_MODULE,
},
.probe = wm831x_spi_probe,
.remove = __devexit_p(wm831x_spi_remove),
.suspend = wm831x_spi_suspend,
};
static struct spi_driver wm8321_spi_driver = {
.driver = {
.name = "wm8321",
.bus = &spi_bus_type,
.owner = THIS_MODULE,
},
.probe = wm831x_spi_probe,
.remove = __devexit_p(wm831x_spi_remove),
.suspend = wm831x_spi_suspend,
};
static struct spi_driver wm8325_spi_driver = {
.driver = {
.name = "wm8325",
.bus = &spi_bus_type,
.owner = THIS_MODULE,
},
.probe = wm831x_spi_probe,
.remove = __devexit_p(wm831x_spi_remove),
.suspend = wm831x_spi_suspend,
};
static int __init wm831x_spi_init(void)
{
int ret;
ret = spi_register_driver(&wm8310_spi_driver);
if (ret != 0)
pr_err("Failed to register WM8310 SPI driver: %d\n", ret);
ret = spi_register_driver(&wm8311_spi_driver);
if (ret != 0)
pr_err("Failed to register WM8311 SPI driver: %d\n", ret);
ret = spi_register_driver(&wm8312_spi_driver);
if (ret != 0)
pr_err("Failed to register WM8312 SPI driver: %d\n", ret);
ret = spi_register_driver(&wm8320_spi_driver);
if (ret != 0)
pr_err("Failed to register WM8320 SPI driver: %d\n", ret);
ret = spi_register_driver(&wm8321_spi_driver);
if (ret != 0)
pr_err("Failed to register WM8321 SPI driver: %d\n", ret);
ret = spi_register_driver(&wm8325_spi_driver);
if (ret != 0)
pr_err("Failed to register WM8325 SPI driver: %d\n", ret);
return 0;
}
subsys_initcall(wm831x_spi_init);
static void __exit wm831x_spi_exit(void)
{
spi_unregister_driver(&wm8325_spi_driver);
spi_unregister_driver(&wm8321_spi_driver);
spi_unregister_driver(&wm8320_spi_driver);
spi_unregister_driver(&wm8312_spi_driver);
spi_unregister_driver(&wm8311_spi_driver);
spi_unregister_driver(&wm8310_spi_driver);
}
module_exit(wm831x_spi_exit);
MODULE_DESCRIPTION("SPI support for WM831x/2x AudioPlus PMICs");
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Mark Brown");
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