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/*
* Copyright (C) 2010 ST-Ericsson
* Copyright (C) 2009 STMicroelectronics
*
* This file is licensed under the terms of the GNU General Public
* License version 2. This program is licensed "as is" without any
* warranty of any kind, whether express or implied.
*/
#include <linux/device.h>
#include <linux/irq.h>
#include <linux/gpio.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/err.h>
#include <linux/clk.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <mach/hardware.h>
static struct gpio_altfun_data *altfun_table;
static int altfun_table_size;
static DEFINE_MUTEX(altfun_lock);
/**
* stm_gpio_set_altfunctable - set the alternate function table
* @table: pointer to the altfunction table
* @size: number of elements in the table
*/
int stm_gpio_set_altfunctable(struct gpio_altfun_data *table, int size)
{
int ret = 0;
mutex_lock(&altfun_lock);
if (altfun_table) {
ret = -EBUSY;
goto out;
}
altfun_table = table;
altfun_table_size = size;
out:
mutex_unlock(&altfun_lock);
return ret;
}
/**
* stm_gpio_altfuncenable - enables alternate functions for
* the given set of GPIOs
* @alt_func: GPIO altfunction to disable
*
* Enable the given set of alternate functions. Error will be returned if any
* of the pins or invalid or busy.
*/
int stm_gpio_altfuncenable(gpio_alt_function alt_func)
{
int i, j, found = false;
int ret = -EINVAL;
int start, end;
mutex_lock(&altfun_lock);
for (i = 0; i < altfun_table_size; i++) {
if (altfun_table[i].altfun != alt_func)
continue;
start = altfun_table[i].start;
end = altfun_table[i].end;
if (start > end) {
j = start;
start = end;
end = j;
}
found = true;
if (!gpio_is_valid(start) || !gpio_is_valid(end)) {
printk(KERN_ERR
"%s: GPIO range %d-%d for %s is not valid for\n",
__func__, start, end, altfun_table[i].dev_name);
goto out;
}
for (j = start; j <= end; j++) {
if (gpio_request(j, altfun_table[i].dev_name) < 0) {
printk(KERN_ERR
"%s:Failed to set %s, GPIO %d is busy\n",
__func__, altfun_table[i].dev_name, j);
ret = -EBUSY;
goto out;
}
nmk_gpio_set_mode(j, altfun_table[i].type);
}
}
if (found)
ret = 0;
out:
mutex_unlock(&altfun_lock);
return ret;
}
EXPORT_SYMBOL(stm_gpio_altfuncenable);
/**
* stm_gpio_altfuncdisable - disable the alternate functions for
* the given set of GPIOs.
* @alt_func: GPIO altfunction enum
*
* Disable the given set of alternate functions. Error will be returned if any
* of the pins or invalid.
**/
int stm_gpio_altfuncdisable(gpio_alt_function alt_func)
{
bool found = false;
int ret = -EINVAL;
int i, j;
int start, end;
mutex_lock(&altfun_lock);
for (i = 0; i < altfun_table_size; i++) {
if (altfun_table[i].altfun != alt_func)
continue;
start = altfun_table[i].start;
end = altfun_table[i].end;
if (start > end) {
j = start;
start = end;
end = j;
}
found = true;
if (!gpio_is_valid(start) || !gpio_is_valid(end)) {
printk(KERN_ERR
"%s: GPIO range %d-%d for %s is out of bound\n",
__func__, start, end, altfun_table[i].dev_name);
goto out;
}
for (j = start; j <= end; j++) {
/* Reset the pin - input, gpio */
gpio_direction_input(j);
nmk_gpio_set_mode(j, NMK_GPIO_ALT_GPIO);
gpio_free(j);
}
}
if (!found)
printk(KERN_ERR
"%s: Didn't find any GPIO alt interface named '%s'\n",
__func__, altfun_table[i].dev_name);
if (found)
ret = 0;
out:
mutex_unlock(&altfun_lock);
return ret;
}
EXPORT_SYMBOL(stm_gpio_altfuncdisable);
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