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mfd/gpio: add a GPIO interface to the UCB1400 MFD chip driver via gpiolib

Browse source 
Cc: Eric Miao <eric.y.miao@gmail.com>
Cc: Russell King <rmk@arm.linux.org.uk>
Cc: David Brownell <david-b@pacbell.net>
Cc: Samuel Ortiz <sameo@openedhand.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Marek Vasut 2009-09-22 16:46:35 -07:00 committed by Linus Torvalds
parent 1e5db00687
commit 4cf8e53b3b
5 changed files with 184 additions and 4 deletions
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12
drivers/gpio/Kconfig
View file

@ -202,4 +202,16 @@ config GPIO_MC33880
SPI driver for Freescale MC33880 high-side/low-side switch.
This provides GPIO interface supporting inputs and outputs.
comment "AC97 GPIO expanders:"
config GPIO_UCB1400
bool "Philips UCB1400 GPIO"
depends on UCB1400_CORE
help
This enables support for the Philips UCB1400 GPIO pins.
The UCB1400 is an AC97 audio codec.
To compile this driver as a module, choose M here: the
module will be called ucb1400_gpio.
endif

1
drivers/gpio/Makefile
View file

@ -12,6 +12,7 @@ obj-$(CONFIG_GPIO_PCA953X) += pca953x.o
obj-$(CONFIG_GPIO_PCF857X) += pcf857x.o
obj-$(CONFIG_GPIO_PL061) += pl061.o
obj-$(CONFIG_GPIO_TWL4030) += twl4030-gpio.o
obj-$(CONFIG_GPIO_UCB1400) += ucb1400_gpio.o
obj-$(CONFIG_GPIO_XILINX) += xilinx_gpio.o
obj-$(CONFIG_GPIO_BT8XX) += bt8xxgpio.o
obj-$(CONFIG_GPIO_VR41XX) += vr41xx_giu.o

125
drivers/gpio/ucb1400_gpio.c Normal file
View file

@ -0,0 +1,125 @@
/*
* Philips UCB1400 GPIO driver
*
* Author: Marek Vasut <marek.vasut@gmail.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/module.h>
#include <linux/ucb1400.h>
struct ucb1400_gpio_data *ucbdata;
static int ucb1400_gpio_dir_in(struct gpio_chip *gc, unsigned off)
{
struct ucb1400_gpio *gpio;
gpio = container_of(gc, struct ucb1400_gpio, gc);
ucb1400_gpio_set_direction(gpio->ac97, off, 0);
return 0;
}
static int ucb1400_gpio_dir_out(struct gpio_chip *gc, unsigned off, int val)
{
struct ucb1400_gpio *gpio;
gpio = container_of(gc, struct ucb1400_gpio, gc);
ucb1400_gpio_set_direction(gpio->ac97, off, 1);
ucb1400_gpio_set_value(gpio->ac97, off, val);
return 0;
}
static int ucb1400_gpio_get(struct gpio_chip *gc, unsigned off)
{
struct ucb1400_gpio *gpio;
gpio = container_of(gc, struct ucb1400_gpio, gc);
return ucb1400_gpio_get_value(gpio->ac97, off);
}
static void ucb1400_gpio_set(struct gpio_chip *gc, unsigned off, int val)
{
struct ucb1400_gpio *gpio;
gpio = container_of(gc, struct ucb1400_gpio, gc);
ucb1400_gpio_set_value(gpio->ac97, off, val);
}
static int ucb1400_gpio_probe(struct platform_device *dev)
{
struct ucb1400_gpio *ucb = dev->dev.platform_data;
int err = 0;
if (!(ucbdata && ucbdata->gpio_offset)) {
err = -EINVAL;
goto err;
}
platform_set_drvdata(dev, ucb);
ucb->gc.label = "ucb1400_gpio";
ucb->gc.base = ucbdata->gpio_offset;
ucb->gc.ngpio = 10;
ucb->gc.owner = THIS_MODULE;
ucb->gc.direction_input = ucb1400_gpio_dir_in;
ucb->gc.direction_output = ucb1400_gpio_dir_out;
ucb->gc.get = ucb1400_gpio_get;
ucb->gc.set = ucb1400_gpio_set;
ucb->gc.can_sleep = 1;
err = gpiochip_add(&ucb->gc);
if (err)
goto err;
if (ucbdata && ucbdata->gpio_setup)
err = ucbdata->gpio_setup(&dev->dev, ucb->gc.ngpio);
err:
return err;
}
static int ucb1400_gpio_remove(struct platform_device *dev)
{
int err = 0;
struct ucb1400_gpio *ucb = platform_get_drvdata(dev);
if (ucbdata && ucbdata->gpio_teardown) {
err = ucbdata->gpio_teardown(&dev->dev, ucb->gc.ngpio);
if (err)
return err;
}
err = gpiochip_remove(&ucb->gc);
return err;
}
static struct platform_driver ucb1400_gpio_driver = {
.probe = ucb1400_gpio_probe,
.remove = ucb1400_gpio_remove,
.driver = {
.name = "ucb1400_gpio"
},
};
static int __init ucb1400_gpio_init(void)
{
return platform_driver_register(&ucb1400_gpio_driver);
}
static void __exit ucb1400_gpio_exit(void)
{
platform_driver_unregister(&ucb1400_gpio_driver);
}
void __init ucb1400_gpio_set_data(struct ucb1400_gpio_data *data)
{
ucbdata = data;
}
module_init(ucb1400_gpio_init);
module_exit(ucb1400_gpio_exit);
MODULE_DESCRIPTION("Philips UCB1400 GPIO driver");
MODULE_LICENSE("GPL");

31
drivers/mfd/ucb1400_core.c
View file

@ -48,9 +48,11 @@ static int ucb1400_core_probe(struct device *dev)
int err;
struct ucb1400 *ucb;
struct ucb1400_ts ucb_ts;
struct ucb1400_gpio ucb_gpio;
struct snd_ac97 *ac97;
memset(&ucb_ts, 0, sizeof(ucb_ts));
memset(&ucb_gpio, 0, sizeof(ucb_gpio));
ucb = kzalloc(sizeof(struct ucb1400), GFP_KERNEL);
if (!ucb) {
@ -68,25 +70,44 @@ static int ucb1400_core_probe(struct device *dev)
goto err0;
}
/* GPIO */
ucb_gpio.ac97 = ac97;
ucb->ucb1400_gpio = platform_device_alloc("ucb1400_gpio", -1);
if (!ucb->ucb1400_gpio) {
err = -ENOMEM;
goto err0;
}
err = platform_device_add_data(ucb->ucb1400_gpio, &ucb_gpio,
sizeof(ucb_gpio));
if (err)
goto err1;
err = platform_device_add(ucb->ucb1400_gpio);
if (err)
goto err1;
/* TOUCHSCREEN */
ucb_ts.ac97 = ac97;
ucb->ucb1400_ts = platform_device_alloc("ucb1400_ts", -1);
if (!ucb->ucb1400_ts) {
err = -ENOMEM;
goto err0;
goto err2;
}
err = platform_device_add_data(ucb->ucb1400_ts, &ucb_ts,
sizeof(ucb_ts));
if (err)
goto err1;
goto err3;
err = platform_device_add(ucb->ucb1400_ts);
if (err)
goto err1;
goto err3;
return 0;
err1:
err3:
platform_device_put(ucb->ucb1400_ts);
err2:
platform_device_unregister(ucb->ucb1400_gpio);
err1:
platform_device_put(ucb->ucb1400_gpio);
err0:
kfree(ucb);
err:
@ -98,6 +119,8 @@ static int ucb1400_core_remove(struct device *dev)
struct ucb1400 *ucb = dev_get_drvdata(dev);
platform_device_unregister(ucb->ucb1400_ts);
platform_device_unregister(ucb->ucb1400_gpio);
kfree(ucb);
return 0;
}

19
include/linux/ucb1400.h
View file

@ -26,6 +26,7 @@
#include <sound/ac97_codec.h>
#include <linux/mutex.h>
#include <linux/platform_device.h>
#include <linux/gpio.h>
/*
* UCB1400 AC-link registers
@ -82,6 +83,17 @@
#define UCB_ID 0x7e
#define UCB_ID_1400 0x4304
struct ucb1400_gpio_data {
int gpio_offset;
int (*gpio_setup)(struct device *dev, int ngpio);
int (*gpio_teardown)(struct device *dev, int ngpio);
};
struct ucb1400_gpio {
struct gpio_chip gc;
struct snd_ac97 *ac97;
};
struct ucb1400_ts {
struct input_dev *ts_idev;
struct task_struct *ts_task;
@ -95,6 +107,7 @@ struct ucb1400_ts {
struct ucb1400 {
struct platform_device *ucb1400_ts;
struct platform_device *ucb1400_gpio;
};
static inline u16 ucb1400_reg_read(struct snd_ac97 *ac97, u16 reg)
@ -147,4 +160,10 @@ static inline void ucb1400_adc_disable(struct snd_ac97 *ac97)
unsigned int ucb1400_adc_read(struct snd_ac97 *ac97, u16 adc_channel,
int adcsync);
#ifdef CONFIG_GPIO_UCB1400
void __init ucb1400_gpio_set_data(struct ucb1400_gpio_data *data);
#else
static inline void ucb1400_gpio_set_data(struct ucb1400_gpio_data *data) {}
#endif
#endif