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mfd: Add WM831x SPI support 

Implement support for controlling WM831x and WM832x devices using SPI.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Mark Brown 2010-10-20 00:00:11 +02:00 committed by Samuel Ortiz
parent e5b486841d
commit 2aa13b9e80
3 changed files with 244 additions and 0 deletions
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11
drivers/mfd/Kconfig
View File

@ -329,6 +329,17 @@ config MFD_WM831X_I2C
for accessing the device, additional drivers must be enabled in
order to use the functionality of the device.
config MFD_WM831X_SPI
bool "Support Wolfson Microelectronics WM831x/2x PMICs with SPI"
select MFD_CORE
select MFD_WM831X
depends on SPI_MASTER && GENERIC_HARDIRQS
help
Support for the Wolfson Microelecronics WM831x and WM832x PMICs
when controlled using SPI. This driver provides common support
for accessing the device, additional drivers must be enabled in
order to use the functionality of the device.
config MFD_WM8350
bool
depends on GENERIC_HARDIRQS

1
drivers/mfd/Makefile
View File

@ -25,6 +25,7 @@ obj-$(CONFIG_MFD_WM8400) += wm8400-core.o
wm831x-objs := wm831x-core.o wm831x-irq.o wm831x-otp.o
obj-$(CONFIG_MFD_WM831X) += wm831x.o
obj-$(CONFIG_MFD_WM831X_I2C) += wm831x-i2c.o
obj-$(CONFIG_MFD_WM831X_SPI) += wm831x-spi.o
wm8350-objs := wm8350-core.o wm8350-regmap.o wm8350-gpio.o
wm8350-objs += wm8350-irq.o
obj-$(CONFIG_MFD_WM8350) += wm8350.o

232
drivers/mfd/wm831x-spi.c Normal file
View File

@ -0,0 +1,232 @@
/*
* 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");