forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
167 lines
3.8 KiB
167 lines
3.8 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
|
/* |
|
* GPIO driver for Analog Devices ADP5520 MFD PMICs |
|
* |
|
* Copyright 2009 Analog Devices Inc. |
|
*/ |
|
|
|
#include <linux/module.h> |
|
#include <linux/slab.h> |
|
#include <linux/kernel.h> |
|
#include <linux/init.h> |
|
#include <linux/platform_device.h> |
|
#include <linux/mfd/adp5520.h> |
|
#include <linux/gpio/driver.h> |
|
|
|
struct adp5520_gpio { |
|
struct device *master; |
|
struct gpio_chip gpio_chip; |
|
unsigned char lut[ADP5520_MAXGPIOS]; |
|
unsigned long output; |
|
}; |
|
|
|
static int adp5520_gpio_get_value(struct gpio_chip *chip, unsigned off) |
|
{ |
|
struct adp5520_gpio *dev; |
|
uint8_t reg_val; |
|
|
|
dev = gpiochip_get_data(chip); |
|
|
|
/* |
|
* There are dedicated registers for GPIO IN/OUT. |
|
* Make sure we return the right value, even when configured as output |
|
*/ |
|
|
|
if (test_bit(off, &dev->output)) |
|
adp5520_read(dev->master, ADP5520_GPIO_OUT, ®_val); |
|
else |
|
adp5520_read(dev->master, ADP5520_GPIO_IN, ®_val); |
|
|
|
return !!(reg_val & dev->lut[off]); |
|
} |
|
|
|
static void adp5520_gpio_set_value(struct gpio_chip *chip, |
|
unsigned off, int val) |
|
{ |
|
struct adp5520_gpio *dev; |
|
dev = gpiochip_get_data(chip); |
|
|
|
if (val) |
|
adp5520_set_bits(dev->master, ADP5520_GPIO_OUT, dev->lut[off]); |
|
else |
|
adp5520_clr_bits(dev->master, ADP5520_GPIO_OUT, dev->lut[off]); |
|
} |
|
|
|
static int adp5520_gpio_direction_input(struct gpio_chip *chip, unsigned off) |
|
{ |
|
struct adp5520_gpio *dev; |
|
dev = gpiochip_get_data(chip); |
|
|
|
clear_bit(off, &dev->output); |
|
|
|
return adp5520_clr_bits(dev->master, ADP5520_GPIO_CFG_2, |
|
dev->lut[off]); |
|
} |
|
|
|
static int adp5520_gpio_direction_output(struct gpio_chip *chip, |
|
unsigned off, int val) |
|
{ |
|
struct adp5520_gpio *dev; |
|
int ret = 0; |
|
dev = gpiochip_get_data(chip); |
|
|
|
set_bit(off, &dev->output); |
|
|
|
if (val) |
|
ret |= adp5520_set_bits(dev->master, ADP5520_GPIO_OUT, |
|
dev->lut[off]); |
|
else |
|
ret |= adp5520_clr_bits(dev->master, ADP5520_GPIO_OUT, |
|
dev->lut[off]); |
|
|
|
ret |= adp5520_set_bits(dev->master, ADP5520_GPIO_CFG_2, |
|
dev->lut[off]); |
|
|
|
return ret; |
|
} |
|
|
|
static int adp5520_gpio_probe(struct platform_device *pdev) |
|
{ |
|
struct adp5520_gpio_platform_data *pdata = dev_get_platdata(&pdev->dev); |
|
struct adp5520_gpio *dev; |
|
struct gpio_chip *gc; |
|
int ret, i, gpios; |
|
unsigned char ctl_mask = 0; |
|
|
|
if (pdata == NULL) { |
|
dev_err(&pdev->dev, "missing platform data\n"); |
|
return -ENODEV; |
|
} |
|
|
|
if (pdev->id != ID_ADP5520) { |
|
dev_err(&pdev->dev, "only ADP5520 supports GPIO\n"); |
|
return -ENODEV; |
|
} |
|
|
|
dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL); |
|
if (dev == NULL) |
|
return -ENOMEM; |
|
|
|
dev->master = pdev->dev.parent; |
|
|
|
for (gpios = 0, i = 0; i < ADP5520_MAXGPIOS; i++) |
|
if (pdata->gpio_en_mask & (1 << i)) |
|
dev->lut[gpios++] = 1 << i; |
|
|
|
if (gpios < 1) |
|
return -EINVAL; |
|
|
|
gc = &dev->gpio_chip; |
|
gc->direction_input = adp5520_gpio_direction_input; |
|
gc->direction_output = adp5520_gpio_direction_output; |
|
gc->get = adp5520_gpio_get_value; |
|
gc->set = adp5520_gpio_set_value; |
|
gc->can_sleep = true; |
|
|
|
gc->base = pdata->gpio_start; |
|
gc->ngpio = gpios; |
|
gc->label = pdev->name; |
|
gc->owner = THIS_MODULE; |
|
|
|
ret = adp5520_clr_bits(dev->master, ADP5520_GPIO_CFG_1, |
|
pdata->gpio_en_mask); |
|
|
|
if (pdata->gpio_en_mask & ADP5520_GPIO_C3) |
|
ctl_mask |= ADP5520_C3_MODE; |
|
|
|
if (pdata->gpio_en_mask & ADP5520_GPIO_R3) |
|
ctl_mask |= ADP5520_R3_MODE; |
|
|
|
if (ctl_mask) |
|
ret = adp5520_set_bits(dev->master, ADP5520_LED_CONTROL, |
|
ctl_mask); |
|
|
|
ret |= adp5520_set_bits(dev->master, ADP5520_GPIO_PULLUP, |
|
pdata->gpio_pullup_mask); |
|
|
|
if (ret) { |
|
dev_err(&pdev->dev, "failed to write\n"); |
|
return ret; |
|
} |
|
|
|
return devm_gpiochip_add_data(&pdev->dev, &dev->gpio_chip, dev); |
|
} |
|
|
|
static struct platform_driver adp5520_gpio_driver = { |
|
.driver = { |
|
.name = "adp5520-gpio", |
|
}, |
|
.probe = adp5520_gpio_probe, |
|
}; |
|
|
|
module_platform_driver(adp5520_gpio_driver); |
|
|
|
MODULE_AUTHOR("Michael Hennerich <[email protected]>"); |
|
MODULE_DESCRIPTION("GPIO ADP5520 Driver"); |
|
MODULE_LICENSE("GPL"); |
|
MODULE_ALIAS("platform:adp5520-gpio");
|
|
|