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/* Smedia Glamo 336x/337x gpio driver
*
* (C) 2009 Lars-Peter Clausen
*
* 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/spinlock.h>
#include <linux/io.h>
#include <linux/platform_device.h>
#include <linux/gpio.h>
#include <linux/mfd/glamo.h>
#include "glamo-core.h"
#include "glamo-regs.h"
#define GLAMO_NR_GPIO 21
#define GLAMO_NR_GPIO_REGS DIV_ROUND_UP(GLAMO_NR_GPIO, 4)
#define GLAMO_REG_GPIO(x) (((x) * 2) + GLAMO_REG_GPIO_GEN1)
struct glamo_gpio {
struct glamo_core *glamo;
struct gpio_chip chip;
uint16_t saved_regs[GLAMO_NR_GPIO_REGS];
};
#define REG_OF_GPIO(gpio) (GLAMO_REG_GPIO(gpio >> 2))
#define NUM_OF_GPIO(gpio) (gpio & 0x3)
#define DIRECTION_BIT(gpio) (1 << (NUM_OF_GPIO(gpio) + 0))
#define OUTPUT_BIT(gpio) (1 << (NUM_OF_GPIO(gpio) + 4))
#define INPUT_BIT(gpio) (1 << (NUM_OF_GPIO(gpio) + 8))
#define FUNC_BIT(gpio) (1 << (NUM_OF_GPIO(gpio) + 12))
static inline struct glamo_core *chip_to_glamo(struct gpio_chip *chip)
{
return container_of(chip, struct glamo_gpio, chip)->glamo;
}
static void glamo_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
{
struct glamo_core *glamo = chip_to_glamo(chip);
unsigned int reg = REG_OF_GPIO(offset);
u_int16_t tmp;
spin_lock(&glamo->lock);
tmp = readw(glamo->base + reg);
if (value)
tmp |= OUTPUT_BIT(offset);
else
tmp &= ~OUTPUT_BIT(offset);
writew(tmp, glamo->base + reg);
spin_unlock(&glamo->lock);
}
static int glamo_gpio_get(struct gpio_chip *chip, unsigned offset)
{
struct glamo_core *glamo = chip_to_glamo(chip);
return readw(glamo->base + REG_OF_GPIO(offset)) & INPUT_BIT(offset) ? 1 : 0;
}
static int glamo_gpio_request(struct gpio_chip *chip, unsigned offset)
{
struct glamo_core *glamo = chip_to_glamo(chip);
unsigned int reg = REG_OF_GPIO(offset);
u_int16_t tmp;
spin_lock(&glamo->lock);
tmp = readw(glamo->base + reg);
if ((tmp & FUNC_BIT(offset)) == 0) {
tmp |= FUNC_BIT(offset);
writew(tmp, glamo->base + reg);
}
spin_unlock(&glamo->lock);
return 0;
}
static void glamo_gpio_free(struct gpio_chip *chip, unsigned offset)
{
struct glamo_core *glamo = chip_to_glamo(chip);
unsigned int reg = REG_OF_GPIO(offset);
u_int16_t tmp;
spin_lock(&glamo->lock);
tmp = readw(glamo->base + reg);
if ((tmp & FUNC_BIT(offset)) == 1) {
tmp &= ~FUNC_BIT(offset);
writew(tmp, glamo->base + reg);
}
spin_unlock(&glamo->lock);
}
static int glamo_gpio_direction_output(struct gpio_chip *chip, unsigned offset,
int value)
{
struct glamo_core *glamo = chip_to_glamo(chip);
unsigned int reg = REG_OF_GPIO(offset);
u_int16_t tmp;
spin_lock(&glamo->lock);
tmp = readw(glamo->base + reg);
tmp &= ~DIRECTION_BIT(offset);
if (value)
tmp |= OUTPUT_BIT(offset);
else
tmp &= ~OUTPUT_BIT(offset);
writew(tmp, glamo->base + reg);
spin_unlock(&glamo->lock);
return 0;
}
static int glamo_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
{
struct glamo_core *glamo = chip_to_glamo(chip);
unsigned int reg = REG_OF_GPIO(offset);
u_int16_t tmp;
spin_lock(&glamo->lock);
tmp = readw(glamo->base + reg);
if ((tmp & DIRECTION_BIT(offset)) == 0) {
tmp |= DIRECTION_BIT(offset);
writew(tmp, glamo->base + reg);
}
spin_unlock(&glamo->lock);
return 0;
}
static const struct __devinit gpio_chip glamo_gpio_chip = {
.label = "glamo",
.request = glamo_gpio_request,
.free = glamo_gpio_free,
.direction_input = glamo_gpio_direction_input,
.get = glamo_gpio_get,
.direction_output = glamo_gpio_direction_output,
.set = glamo_gpio_set,
.base = -1,
.ngpio = GLAMO_NR_GPIO,
.can_sleep = 0,
.owner = THIS_MODULE,
};
static int __devinit glamo_gpio_probe(struct platform_device *pdev)
{
struct glamo_platform_data *pdata = pdev->dev.parent->platform_data;
struct glamo_gpio *glamo_gpio;
int ret;
glamo_gpio = kzalloc(sizeof(struct glamo_gpio), GFP_KERNEL);
if (!glamo_gpio)
return -ENOMEM;
glamo_gpio->glamo = dev_get_drvdata(pdev->dev.parent);
glamo_gpio->chip = glamo_gpio_chip;
glamo_gpio->chip.dev = &pdev->dev;
if (pdata)
glamo_gpio->chip.base = pdata->gpio_base;
ret = gpiochip_add(&glamo_gpio->chip);
if (ret) {
dev_err(&pdev->dev, "Could not register gpio chip: %d\n", ret);
goto err;
}
platform_set_drvdata(pdev, glamo_gpio);
return 0;
err:
kfree(glamo_gpio);
return ret;
}
static int __devexit glamo_gpio_remove(struct platform_device *pdev)
{
struct glamo_gpio *glamo_gpio = platform_get_drvdata(pdev);
int ret;
ret = gpiochip_remove(&glamo_gpio->chip);
if (!ret)
goto done;
platform_set_drvdata(pdev, NULL);
kfree(glamo_gpio);
done:
return ret;
}
#ifdef CONFIG_PM
static int glamo_gpio_suspend(struct device *dev)
{
struct glamo_gpio *glamo_gpio = dev_get_drvdata(dev);
struct glamo_core *glamo = glamo_gpio->glamo;
uint16_t *saved_regs = glamo_gpio->saved_regs;
int i;
spin_lock(&glamo->lock);
for (i = 0; i < GLAMO_NR_GPIO / 4; ++i)
saved_regs[i] = readw(glamo->base + GLAMO_REG_GPIO(i));
spin_unlock(&glamo->lock);
return 0;
}
static int glamo_gpio_resume(struct device *dev)
{
struct glamo_gpio *glamo_gpio = dev_get_drvdata(dev);
struct glamo_core *glamo = glamo_gpio->glamo;
uint16_t *saved_regs = glamo_gpio->saved_regs;
int i;
spin_lock(&glamo->lock);
for (i = 0; i < GLAMO_NR_GPIO_REGS; ++i)
writew(saved_regs[i], glamo->base + GLAMO_REG_GPIO(i));
spin_unlock(&glamo->lock);
return 0;
}
static const struct dev_pm_ops glamo_pm_ops = {
.suspend = glamo_gpio_suspend,
.resume = glamo_gpio_resume,
.freeze = glamo_gpio_suspend,
.thaw = glamo_gpio_resume,
};
#define GLAMO_GPIO_PM_OPS (&glamo_pm_ops)
#else
#define GLAMO_GPIO_OPS NULL
#endif
static struct platform_driver glamo_gpio_driver = {
.driver = {
.name = "glamo-gpio",
.owner = THIS_MODULE,
.pm = GLAMO_GPIO_PM_OPS,
},
.probe = glamo_gpio_probe,
.remove = __devexit_p(glamo_gpio_remove),
};
static int __devinit glamo_gpio_init(void)
{
return platform_driver_register(&glamo_gpio_driver);
}
static void __exit glamo_gpio_exit(void)
{
platform_driver_unregister(&glamo_gpio_driver);
}
module_init(glamo_gpio_init);
module_exit(glamo_gpio_exit);
MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
MODULE_DESCRIPTION("GPIO interface for the Glamo multimedia device");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:glamo-gpio");
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