70ffd691ff
TWL6040 provides GPO lines to be used for controlling external devices.The number of lines different between versions: twl6040 have 3 GPO while TWL6041 have 1. Signed-off-by: Sergio Aguirre <saaguirre@ti.com> Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com> Acked-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
138 lines
3.6 KiB
C
138 lines
3.6 KiB
C
/*
|
|
* Access to GPOs on TWL6040 chip
|
|
*
|
|
* Copyright (C) 2012 Texas Instruments, Inc.
|
|
*
|
|
* Authors:
|
|
* Sergio Aguirre <saaguirre@ti.com>
|
|
* Peter Ujfalusi <peter.ujfalusi@ti.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.
|
|
*
|
|
* 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/module.h>
|
|
#include <linux/init.h>
|
|
#include <linux/kthread.h>
|
|
#include <linux/irq.h>
|
|
#include <linux/gpio.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/of.h>
|
|
|
|
#include <linux/mfd/twl6040.h>
|
|
|
|
static struct gpio_chip twl6040gpo_chip;
|
|
|
|
static int twl6040gpo_get(struct gpio_chip *chip, unsigned offset)
|
|
{
|
|
struct twl6040 *twl6040 = dev_get_drvdata(chip->dev->parent);
|
|
int ret = 0;
|
|
|
|
ret = twl6040_reg_read(twl6040, TWL6040_REG_GPOCTL);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
return (ret >> offset) & 1;
|
|
}
|
|
|
|
static int twl6040gpo_direction_out(struct gpio_chip *chip, unsigned offset,
|
|
int value)
|
|
{
|
|
/* This only drives GPOs, and can't change direction */
|
|
return 0;
|
|
}
|
|
|
|
static void twl6040gpo_set(struct gpio_chip *chip, unsigned offset, int value)
|
|
{
|
|
struct twl6040 *twl6040 = dev_get_drvdata(chip->dev->parent);
|
|
int ret;
|
|
u8 gpoctl;
|
|
|
|
ret = twl6040_reg_read(twl6040, TWL6040_REG_GPOCTL);
|
|
if (ret < 0)
|
|
return;
|
|
|
|
if (value)
|
|
gpoctl = ret | (1 << offset);
|
|
else
|
|
gpoctl = ret & ~(1 << offset);
|
|
|
|
twl6040_reg_write(twl6040, TWL6040_REG_GPOCTL, gpoctl);
|
|
}
|
|
|
|
static struct gpio_chip twl6040gpo_chip = {
|
|
.label = "twl6040",
|
|
.owner = THIS_MODULE,
|
|
.get = twl6040gpo_get,
|
|
.direction_output = twl6040gpo_direction_out,
|
|
.set = twl6040gpo_set,
|
|
.can_sleep = 1,
|
|
};
|
|
|
|
/*----------------------------------------------------------------------*/
|
|
|
|
static int __devinit gpo_twl6040_probe(struct platform_device *pdev)
|
|
{
|
|
struct twl6040_gpo_data *pdata = pdev->dev.platform_data;
|
|
struct device *twl6040_core_dev = pdev->dev.parent;
|
|
struct twl6040 *twl6040 = dev_get_drvdata(twl6040_core_dev);
|
|
int ret;
|
|
|
|
if (pdata)
|
|
twl6040gpo_chip.base = pdata->gpio_base;
|
|
else
|
|
twl6040gpo_chip.base = -1;
|
|
|
|
if (twl6040_get_revid(twl6040) < TWL6041_REV_ES2_0)
|
|
twl6040gpo_chip.ngpio = 3; /* twl6040 have 3 GPO */
|
|
else
|
|
twl6040gpo_chip.ngpio = 1; /* twl6041 have 1 GPO */
|
|
|
|
twl6040gpo_chip.dev = &pdev->dev;
|
|
#ifdef CONFIG_OF_GPIO
|
|
twl6040gpo_chip.of_node = twl6040_core_dev->of_node;
|
|
#endif
|
|
|
|
ret = gpiochip_add(&twl6040gpo_chip);
|
|
if (ret < 0) {
|
|
dev_err(&pdev->dev, "could not register gpiochip, %d\n", ret);
|
|
twl6040gpo_chip.ngpio = 0;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int __devexit gpo_twl6040_remove(struct platform_device *pdev)
|
|
{
|
|
return gpiochip_remove(&twl6040gpo_chip);
|
|
}
|
|
|
|
/* Note: this hardware lives inside an I2C-based multi-function device. */
|
|
MODULE_ALIAS("platform:twl6040-gpo");
|
|
|
|
static struct platform_driver gpo_twl6040_driver = {
|
|
.driver = {
|
|
.name = "twl6040-gpo",
|
|
.owner = THIS_MODULE,
|
|
},
|
|
.probe = gpo_twl6040_probe,
|
|
.remove = gpo_twl6040_remove,
|
|
};
|
|
|
|
module_platform_driver(gpo_twl6040_driver);
|
|
|
|
MODULE_AUTHOR("Texas Instruments, Inc.");
|
|
MODULE_DESCRIPTION("GPO interface for TWL6040");
|
|
MODULE_LICENSE("GPL");
|