drivers/gpio/gpio-ucb1400.c

0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  * Philips UCB1400 GPIO driver
0004  *
0005  * Author: Marek Vasut <marek.vasut@gmail.com>
0006  */
0007
0008 #include <linux/module.h>
0009 #include <linux/ucb1400.h>
0010
0011 static int ucb1400_gpio_dir_in(struct gpio_chip *gc, unsigned off)
0012 {
0013     struct ucb1400_gpio *gpio;
0014     gpio = gpiochip_get_data(gc);
0015     ucb1400_gpio_set_direction(gpio->ac97, off, 0);
0016     return 0;
0017 }
0018
0019 static int ucb1400_gpio_dir_out(struct gpio_chip *gc, unsigned off, int val)
0020 {
0021     struct ucb1400_gpio *gpio;
0022     gpio = gpiochip_get_data(gc);
0023     ucb1400_gpio_set_direction(gpio->ac97, off, 1);
0024     ucb1400_gpio_set_value(gpio->ac97, off, val);
0025     return 0;
0026 }
0027
0028 static int ucb1400_gpio_get(struct gpio_chip *gc, unsigned off)
0029 {
0030     struct ucb1400_gpio *gpio;
0031
0032     gpio = gpiochip_get_data(gc);
0033     return !!ucb1400_gpio_get_value(gpio->ac97, off);
0034 }
0035
0036 static void ucb1400_gpio_set(struct gpio_chip *gc, unsigned off, int val)
0037 {
0038     struct ucb1400_gpio *gpio;
0039     gpio = gpiochip_get_data(gc);
0040     ucb1400_gpio_set_value(gpio->ac97, off, val);
0041 }
0042
0043 static int ucb1400_gpio_probe(struct platform_device *dev)
0044 {
0045     struct ucb1400_gpio *ucb = dev_get_platdata(&dev->dev);
0046     int err = 0;
0047
0048     if (!(ucb && ucb->gpio_offset)) {
0049         err = -EINVAL;
0050         goto err;
0051     }
0052
0053     platform_set_drvdata(dev, ucb);
0054
0055     ucb->gc.label = "ucb1400_gpio";
0056     ucb->gc.base = ucb->gpio_offset;
0057     ucb->gc.ngpio = 10;
0058     ucb->gc.owner = THIS_MODULE;
0059
0060     ucb->gc.direction_input = ucb1400_gpio_dir_in;
0061     ucb->gc.direction_output = ucb1400_gpio_dir_out;
0062     ucb->gc.get = ucb1400_gpio_get;
0063     ucb->gc.set = ucb1400_gpio_set;
0064     ucb->gc.can_sleep = true;
0065
0066     err = devm_gpiochip_add_data(&dev->dev, &ucb->gc, ucb);
0067
0068 err:
0069     return err;
0070
0071 }
0072
0073 static struct platform_driver ucb1400_gpio_driver = {
0074     .probe  = ucb1400_gpio_probe,
0075     .driver = {
0076         .name   = "ucb1400_gpio"
0077     },
0078 };
0079
0080 module_platform_driver(ucb1400_gpio_driver);
0081
0082 MODULE_DESCRIPTION("Philips UCB1400 GPIO driver");
0083 MODULE_LICENSE("GPL");
0084 MODULE_ALIAS("platform:ucb1400_gpio");