240 lines
6.6 KiB
C
240 lines
6.6 KiB
C
/*
|
|
* TI Palma series PMIC's GPIO driver.
|
|
*
|
|
* Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved.
|
|
*
|
|
* Author: Laxman Dewangan <ldewangan@nvidia.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms and conditions of the GNU General Public License,
|
|
* version 2, as published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope 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, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#include <linux/gpio.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/mfd/palmas.h>
|
|
#include <linux/of.h>
|
|
#include <linux/of_device.h>
|
|
#include <linux/platform_device.h>
|
|
|
|
struct palmas_gpio {
|
|
struct gpio_chip gpio_chip;
|
|
struct palmas *palmas;
|
|
};
|
|
|
|
struct palmas_device_data {
|
|
int ngpio;
|
|
};
|
|
|
|
static inline struct palmas_gpio *to_palmas_gpio(struct gpio_chip *chip)
|
|
{
|
|
return container_of(chip, struct palmas_gpio, gpio_chip);
|
|
}
|
|
|
|
static int palmas_gpio_get(struct gpio_chip *gc, unsigned offset)
|
|
{
|
|
struct palmas_gpio *pg = to_palmas_gpio(gc);
|
|
struct palmas *palmas = pg->palmas;
|
|
unsigned int val;
|
|
int ret;
|
|
unsigned int reg;
|
|
int gpio16 = (offset/8);
|
|
|
|
offset %= 8;
|
|
reg = (gpio16) ? PALMAS_GPIO_DATA_DIR2 : PALMAS_GPIO_DATA_DIR;
|
|
|
|
ret = palmas_read(palmas, PALMAS_GPIO_BASE, reg, &val);
|
|
if (ret < 0) {
|
|
dev_err(gc->dev, "Reg 0x%02x read failed, %d\n", reg, ret);
|
|
return ret;
|
|
}
|
|
|
|
if (val & BIT(offset))
|
|
reg = (gpio16) ? PALMAS_GPIO_DATA_OUT2 : PALMAS_GPIO_DATA_OUT;
|
|
else
|
|
reg = (gpio16) ? PALMAS_GPIO_DATA_IN2 : PALMAS_GPIO_DATA_IN;
|
|
|
|
ret = palmas_read(palmas, PALMAS_GPIO_BASE, reg, &val);
|
|
if (ret < 0) {
|
|
dev_err(gc->dev, "Reg 0x%02x read failed, %d\n", reg, ret);
|
|
return ret;
|
|
}
|
|
return !!(val & BIT(offset));
|
|
}
|
|
|
|
static void palmas_gpio_set(struct gpio_chip *gc, unsigned offset,
|
|
int value)
|
|
{
|
|
struct palmas_gpio *pg = to_palmas_gpio(gc);
|
|
struct palmas *palmas = pg->palmas;
|
|
int ret;
|
|
unsigned int reg;
|
|
int gpio16 = (offset/8);
|
|
|
|
offset %= 8;
|
|
if (gpio16)
|
|
reg = (value) ?
|
|
PALMAS_GPIO_SET_DATA_OUT2 : PALMAS_GPIO_CLEAR_DATA_OUT2;
|
|
else
|
|
reg = (value) ?
|
|
PALMAS_GPIO_SET_DATA_OUT : PALMAS_GPIO_CLEAR_DATA_OUT;
|
|
|
|
ret = palmas_write(palmas, PALMAS_GPIO_BASE, reg, BIT(offset));
|
|
if (ret < 0)
|
|
dev_err(gc->dev, "Reg 0x%02x write failed, %d\n", reg, ret);
|
|
}
|
|
|
|
static int palmas_gpio_output(struct gpio_chip *gc, unsigned offset,
|
|
int value)
|
|
{
|
|
struct palmas_gpio *pg = to_palmas_gpio(gc);
|
|
struct palmas *palmas = pg->palmas;
|
|
int ret;
|
|
unsigned int reg;
|
|
int gpio16 = (offset/8);
|
|
|
|
offset %= 8;
|
|
reg = (gpio16) ? PALMAS_GPIO_DATA_DIR2 : PALMAS_GPIO_DATA_DIR;
|
|
|
|
/* Set the initial value */
|
|
palmas_gpio_set(gc, offset, value);
|
|
|
|
ret = palmas_update_bits(palmas, PALMAS_GPIO_BASE, reg,
|
|
BIT(offset), BIT(offset));
|
|
if (ret < 0)
|
|
dev_err(gc->dev, "Reg 0x%02x update failed, %d\n", reg, ret);
|
|
return ret;
|
|
}
|
|
|
|
static int palmas_gpio_input(struct gpio_chip *gc, unsigned offset)
|
|
{
|
|
struct palmas_gpio *pg = to_palmas_gpio(gc);
|
|
struct palmas *palmas = pg->palmas;
|
|
int ret;
|
|
unsigned int reg;
|
|
int gpio16 = (offset/8);
|
|
|
|
offset %= 8;
|
|
reg = (gpio16) ? PALMAS_GPIO_DATA_DIR2 : PALMAS_GPIO_DATA_DIR;
|
|
|
|
ret = palmas_update_bits(palmas, PALMAS_GPIO_BASE, reg, BIT(offset), 0);
|
|
if (ret < 0)
|
|
dev_err(gc->dev, "Reg 0x%02x update failed, %d\n", reg, ret);
|
|
return ret;
|
|
}
|
|
|
|
static int palmas_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
|
|
{
|
|
struct palmas_gpio *pg = to_palmas_gpio(gc);
|
|
struct palmas *palmas = pg->palmas;
|
|
|
|
return palmas_irq_get_virq(palmas, PALMAS_GPIO_0_IRQ + offset);
|
|
}
|
|
|
|
static const struct palmas_device_data palmas_dev_data = {
|
|
.ngpio = 8,
|
|
};
|
|
|
|
static const struct palmas_device_data tps80036_dev_data = {
|
|
.ngpio = 16,
|
|
};
|
|
|
|
static const struct of_device_id of_palmas_gpio_match[] = {
|
|
{ .compatible = "ti,palmas-gpio", .data = &palmas_dev_data,},
|
|
{ .compatible = "ti,tps65913-gpio", .data = &palmas_dev_data,},
|
|
{ .compatible = "ti,tps65914-gpio", .data = &palmas_dev_data,},
|
|
{ .compatible = "ti,tps80036-gpio", .data = &tps80036_dev_data,},
|
|
{ },
|
|
};
|
|
MODULE_DEVICE_TABLE(of, of_palmas_gpio_match);
|
|
|
|
static int palmas_gpio_probe(struct platform_device *pdev)
|
|
{
|
|
struct palmas *palmas = dev_get_drvdata(pdev->dev.parent);
|
|
struct palmas_platform_data *palmas_pdata;
|
|
struct palmas_gpio *palmas_gpio;
|
|
int ret;
|
|
const struct of_device_id *match;
|
|
const struct palmas_device_data *dev_data;
|
|
|
|
match = of_match_device(of_palmas_gpio_match, &pdev->dev);
|
|
dev_data = match->data;
|
|
if (!dev_data)
|
|
dev_data = &palmas_dev_data;
|
|
|
|
palmas_gpio = devm_kzalloc(&pdev->dev,
|
|
sizeof(*palmas_gpio), GFP_KERNEL);
|
|
if (!palmas_gpio)
|
|
return -ENOMEM;
|
|
|
|
palmas_gpio->palmas = palmas;
|
|
palmas_gpio->gpio_chip.owner = THIS_MODULE;
|
|
palmas_gpio->gpio_chip.label = dev_name(&pdev->dev);
|
|
palmas_gpio->gpio_chip.ngpio = dev_data->ngpio;
|
|
palmas_gpio->gpio_chip.can_sleep = true;
|
|
palmas_gpio->gpio_chip.direction_input = palmas_gpio_input;
|
|
palmas_gpio->gpio_chip.direction_output = palmas_gpio_output;
|
|
palmas_gpio->gpio_chip.to_irq = palmas_gpio_to_irq;
|
|
palmas_gpio->gpio_chip.set = palmas_gpio_set;
|
|
palmas_gpio->gpio_chip.get = palmas_gpio_get;
|
|
palmas_gpio->gpio_chip.dev = &pdev->dev;
|
|
#ifdef CONFIG_OF_GPIO
|
|
palmas_gpio->gpio_chip.of_node = pdev->dev.of_node;
|
|
#endif
|
|
palmas_pdata = dev_get_platdata(palmas->dev);
|
|
if (palmas_pdata && palmas_pdata->gpio_base)
|
|
palmas_gpio->gpio_chip.base = palmas_pdata->gpio_base;
|
|
else
|
|
palmas_gpio->gpio_chip.base = -1;
|
|
|
|
ret = gpiochip_add(&palmas_gpio->gpio_chip);
|
|
if (ret < 0) {
|
|
dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
platform_set_drvdata(pdev, palmas_gpio);
|
|
return ret;
|
|
}
|
|
|
|
static int palmas_gpio_remove(struct platform_device *pdev)
|
|
{
|
|
struct palmas_gpio *palmas_gpio = platform_get_drvdata(pdev);
|
|
|
|
return gpiochip_remove(&palmas_gpio->gpio_chip);
|
|
}
|
|
|
|
static struct platform_driver palmas_gpio_driver = {
|
|
.driver.name = "palmas-gpio",
|
|
.driver.owner = THIS_MODULE,
|
|
.driver.of_match_table = of_palmas_gpio_match,
|
|
.probe = palmas_gpio_probe,
|
|
.remove = palmas_gpio_remove,
|
|
};
|
|
|
|
static int __init palmas_gpio_init(void)
|
|
{
|
|
return platform_driver_register(&palmas_gpio_driver);
|
|
}
|
|
subsys_initcall(palmas_gpio_init);
|
|
|
|
static void __exit palmas_gpio_exit(void)
|
|
{
|
|
platform_driver_unregister(&palmas_gpio_driver);
|
|
}
|
|
module_exit(palmas_gpio_exit);
|
|
|
|
MODULE_ALIAS("platform:palmas-gpio");
|
|
MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
|
|
MODULE_DESCRIPTION("GPIO driver for TI Palmas series PMICs");
|
|
MODULE_LICENSE("GPL v2");
|