254 lines
6.3 KiB
C
254 lines
6.3 KiB
C
/*
|
|
* GPIO Driver for Dialog DA9052 PMICs.
|
|
*
|
|
* Copyright(c) 2011 Dialog Semiconductor Ltd.
|
|
*
|
|
* Author: David Dajun Chen <dchen@diasemi.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.
|
|
*
|
|
*/
|
|
#include <linux/module.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/uaccess.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/gpio.h>
|
|
#include <linux/syscalls.h>
|
|
#include <linux/seq_file.h>
|
|
|
|
#include <linux/mfd/da9052/da9052.h>
|
|
#include <linux/mfd/da9052/reg.h>
|
|
#include <linux/mfd/da9052/pdata.h>
|
|
|
|
#define DA9052_INPUT 1
|
|
#define DA9052_OUTPUT_OPENDRAIN 2
|
|
#define DA9052_OUTPUT_PUSHPULL 3
|
|
|
|
#define DA9052_SUPPLY_VDD_IO1 0
|
|
|
|
#define DA9052_DEBOUNCING_OFF 0
|
|
#define DA9052_DEBOUNCING_ON 1
|
|
|
|
#define DA9052_OUTPUT_LOWLEVEL 0
|
|
|
|
#define DA9052_ACTIVE_LOW 0
|
|
#define DA9052_ACTIVE_HIGH 1
|
|
|
|
#define DA9052_GPIO_MAX_PORTS_PER_REGISTER 8
|
|
#define DA9052_GPIO_SHIFT_COUNT(no) (no%8)
|
|
#define DA9052_GPIO_MASK_UPPER_NIBBLE 0xF0
|
|
#define DA9052_GPIO_MASK_LOWER_NIBBLE 0x0F
|
|
#define DA9052_GPIO_NIBBLE_SHIFT 4
|
|
#define DA9052_IRQ_GPI0 16
|
|
#define DA9052_GPIO_ODD_SHIFT 7
|
|
#define DA9052_GPIO_EVEN_SHIFT 3
|
|
|
|
struct da9052_gpio {
|
|
struct da9052 *da9052;
|
|
struct gpio_chip gp;
|
|
};
|
|
|
|
static inline struct da9052_gpio *to_da9052_gpio(struct gpio_chip *chip)
|
|
{
|
|
return container_of(chip, struct da9052_gpio, gp);
|
|
}
|
|
|
|
static unsigned char da9052_gpio_port_odd(unsigned offset)
|
|
{
|
|
return offset % 2;
|
|
}
|
|
|
|
static int da9052_gpio_get(struct gpio_chip *gc, unsigned offset)
|
|
{
|
|
struct da9052_gpio *gpio = to_da9052_gpio(gc);
|
|
int da9052_port_direction = 0;
|
|
int ret;
|
|
|
|
ret = da9052_reg_read(gpio->da9052,
|
|
DA9052_GPIO_0_1_REG + (offset >> 1));
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
if (da9052_gpio_port_odd(offset)) {
|
|
da9052_port_direction = ret & DA9052_GPIO_ODD_PORT_PIN;
|
|
da9052_port_direction >>= 4;
|
|
} else {
|
|
da9052_port_direction = ret & DA9052_GPIO_EVEN_PORT_PIN;
|
|
}
|
|
|
|
switch (da9052_port_direction) {
|
|
case DA9052_INPUT:
|
|
if (offset < DA9052_GPIO_MAX_PORTS_PER_REGISTER)
|
|
ret = da9052_reg_read(gpio->da9052,
|
|
DA9052_STATUS_C_REG);
|
|
else
|
|
ret = da9052_reg_read(gpio->da9052,
|
|
DA9052_STATUS_D_REG);
|
|
if (ret < 0)
|
|
return ret;
|
|
if (ret & (1 << DA9052_GPIO_SHIFT_COUNT(offset)))
|
|
return 1;
|
|
else
|
|
return 0;
|
|
case DA9052_OUTPUT_PUSHPULL:
|
|
if (da9052_gpio_port_odd(offset))
|
|
return ret & DA9052_GPIO_ODD_PORT_MODE;
|
|
else
|
|
return ret & DA9052_GPIO_EVEN_PORT_MODE;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
static void da9052_gpio_set(struct gpio_chip *gc, unsigned offset, int value)
|
|
{
|
|
struct da9052_gpio *gpio = to_da9052_gpio(gc);
|
|
int ret;
|
|
|
|
if (da9052_gpio_port_odd(offset)) {
|
|
ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
|
|
DA9052_GPIO_0_1_REG,
|
|
DA9052_GPIO_ODD_PORT_MODE,
|
|
value << DA9052_GPIO_ODD_SHIFT);
|
|
if (ret != 0)
|
|
dev_err(gpio->da9052->dev,
|
|
"Failed to updated gpio odd reg,%d",
|
|
ret);
|
|
} else {
|
|
ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
|
|
DA9052_GPIO_0_1_REG,
|
|
DA9052_GPIO_EVEN_PORT_MODE,
|
|
value << DA9052_GPIO_EVEN_SHIFT);
|
|
if (ret != 0)
|
|
dev_err(gpio->da9052->dev,
|
|
"Failed to updated gpio even reg,%d",
|
|
ret);
|
|
}
|
|
}
|
|
|
|
static int da9052_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
|
|
{
|
|
struct da9052_gpio *gpio = to_da9052_gpio(gc);
|
|
unsigned char register_value;
|
|
int ret;
|
|
|
|
/* Format: function - 2 bits type - 1 bit mode - 1 bit */
|
|
register_value = DA9052_INPUT | DA9052_ACTIVE_LOW << 2 |
|
|
DA9052_DEBOUNCING_ON << 3;
|
|
|
|
if (da9052_gpio_port_odd(offset))
|
|
ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
|
|
DA9052_GPIO_0_1_REG,
|
|
DA9052_GPIO_MASK_UPPER_NIBBLE,
|
|
(register_value <<
|
|
DA9052_GPIO_NIBBLE_SHIFT));
|
|
else
|
|
ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
|
|
DA9052_GPIO_0_1_REG,
|
|
DA9052_GPIO_MASK_LOWER_NIBBLE,
|
|
register_value);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int da9052_gpio_direction_output(struct gpio_chip *gc,
|
|
unsigned offset, int value)
|
|
{
|
|
struct da9052_gpio *gpio = to_da9052_gpio(gc);
|
|
unsigned char register_value;
|
|
int ret;
|
|
|
|
/* Format: Function - 2 bits Type - 1 bit Mode - 1 bit */
|
|
register_value = DA9052_OUTPUT_PUSHPULL | DA9052_SUPPLY_VDD_IO1 << 2 |
|
|
value << 3;
|
|
|
|
if (da9052_gpio_port_odd(offset))
|
|
ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
|
|
DA9052_GPIO_0_1_REG,
|
|
DA9052_GPIO_MASK_UPPER_NIBBLE,
|
|
(register_value <<
|
|
DA9052_GPIO_NIBBLE_SHIFT));
|
|
else
|
|
ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
|
|
DA9052_GPIO_0_1_REG,
|
|
DA9052_GPIO_MASK_LOWER_NIBBLE,
|
|
register_value);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int da9052_gpio_to_irq(struct gpio_chip *gc, u32 offset)
|
|
{
|
|
struct da9052_gpio *gpio = to_da9052_gpio(gc);
|
|
struct da9052 *da9052 = gpio->da9052;
|
|
|
|
return da9052->irq_base + DA9052_IRQ_GPI0 + offset;
|
|
}
|
|
|
|
static struct gpio_chip reference_gp __devinitdata = {
|
|
.label = "da9052-gpio",
|
|
.owner = THIS_MODULE,
|
|
.get = da9052_gpio_get,
|
|
.set = da9052_gpio_set,
|
|
.direction_input = da9052_gpio_direction_input,
|
|
.direction_output = da9052_gpio_direction_output,
|
|
.to_irq = da9052_gpio_to_irq,
|
|
.can_sleep = 1,
|
|
.ngpio = 16,
|
|
.base = -1,
|
|
};
|
|
|
|
static int __devinit da9052_gpio_probe(struct platform_device *pdev)
|
|
{
|
|
struct da9052_gpio *gpio;
|
|
struct da9052_pdata *pdata;
|
|
int ret;
|
|
|
|
gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
|
|
if (gpio == NULL)
|
|
return -ENOMEM;
|
|
|
|
gpio->da9052 = dev_get_drvdata(pdev->dev.parent);
|
|
pdata = gpio->da9052->dev->platform_data;
|
|
|
|
gpio->gp = reference_gp;
|
|
if (pdata && pdata->gpio_base)
|
|
gpio->gp.base = pdata->gpio_base;
|
|
|
|
ret = gpiochip_add(&gpio->gp);
|
|
if (ret < 0) {
|
|
dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
platform_set_drvdata(pdev, gpio);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __devexit da9052_gpio_remove(struct platform_device *pdev)
|
|
{
|
|
struct da9052_gpio *gpio = platform_get_drvdata(pdev);
|
|
|
|
return gpiochip_remove(&gpio->gp);
|
|
}
|
|
|
|
static struct platform_driver da9052_gpio_driver = {
|
|
.probe = da9052_gpio_probe,
|
|
.remove = __devexit_p(da9052_gpio_remove),
|
|
.driver = {
|
|
.name = "da9052-gpio",
|
|
.owner = THIS_MODULE,
|
|
},
|
|
};
|
|
|
|
module_platform_driver(da9052_gpio_driver);
|
|
|
|
MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
|
|
MODULE_DESCRIPTION("DA9052 GPIO Device Driver");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS("platform:da9052-gpio");
|