2 * GPIO driver for Analog Devices ADP5520 MFD PMICs
4 * Copyright 2009 Analog Devices Inc.
6 * Licensed under the GPL-2 or later.
9 #include <linux/module.h>
10 #include <linux/slab.h>
11 #include <linux/kernel.h>
12 #include <linux/init.h>
13 #include <linux/platform_device.h>
14 #include <linux/mfd/adp5520.h>
16 #include <linux/gpio.h>
19 struct device *master;
20 struct gpio_chip gpio_chip;
21 unsigned char lut[ADP5520_MAXGPIOS];
25 static int adp5520_gpio_get_value(struct gpio_chip *chip, unsigned off)
27 struct adp5520_gpio *dev;
30 dev = container_of(chip, struct adp5520_gpio, gpio_chip);
33 * There are dedicated registers for GPIO IN/OUT.
34 * Make sure we return the right value, even when configured as output
37 if (test_bit(off, &dev->output))
38 adp5520_read(dev->master, ADP5520_GPIO_OUT, ®_val);
40 adp5520_read(dev->master, ADP5520_GPIO_IN, ®_val);
42 return !!(reg_val & dev->lut[off]);
45 static void adp5520_gpio_set_value(struct gpio_chip *chip,
46 unsigned off, int val)
48 struct adp5520_gpio *dev;
49 dev = container_of(chip, struct adp5520_gpio, gpio_chip);
52 adp5520_set_bits(dev->master, ADP5520_GPIO_OUT, dev->lut[off]);
54 adp5520_clr_bits(dev->master, ADP5520_GPIO_OUT, dev->lut[off]);
57 static int adp5520_gpio_direction_input(struct gpio_chip *chip, unsigned off)
59 struct adp5520_gpio *dev;
60 dev = container_of(chip, struct adp5520_gpio, gpio_chip);
62 clear_bit(off, &dev->output);
64 return adp5520_clr_bits(dev->master, ADP5520_GPIO_CFG_2,
68 static int adp5520_gpio_direction_output(struct gpio_chip *chip,
69 unsigned off, int val)
71 struct adp5520_gpio *dev;
73 dev = container_of(chip, struct adp5520_gpio, gpio_chip);
75 set_bit(off, &dev->output);
78 ret |= adp5520_set_bits(dev->master, ADP5520_GPIO_OUT,
81 ret |= adp5520_clr_bits(dev->master, ADP5520_GPIO_OUT,
84 ret |= adp5520_set_bits(dev->master, ADP5520_GPIO_CFG_2,
90 static int adp5520_gpio_probe(struct platform_device *pdev)
92 struct adp5520_gpio_platform_data *pdata = dev_get_platdata(&pdev->dev);
93 struct adp5520_gpio *dev;
96 unsigned char ctl_mask = 0;
99 dev_err(&pdev->dev, "missing platform data\n");
103 if (pdev->id != ID_ADP5520) {
104 dev_err(&pdev->dev, "only ADP5520 supports GPIO\n");
108 dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
112 dev->master = pdev->dev.parent;
114 for (gpios = 0, i = 0; i < ADP5520_MAXGPIOS; i++)
115 if (pdata->gpio_en_mask & (1 << i))
116 dev->lut[gpios++] = 1 << i;
123 gc = &dev->gpio_chip;
124 gc->direction_input = adp5520_gpio_direction_input;
125 gc->direction_output = adp5520_gpio_direction_output;
126 gc->get = adp5520_gpio_get_value;
127 gc->set = adp5520_gpio_set_value;
128 gc->can_sleep = true;
130 gc->base = pdata->gpio_start;
132 gc->label = pdev->name;
133 gc->owner = THIS_MODULE;
135 ret = adp5520_clr_bits(dev->master, ADP5520_GPIO_CFG_1,
136 pdata->gpio_en_mask);
138 if (pdata->gpio_en_mask & ADP5520_GPIO_C3)
139 ctl_mask |= ADP5520_C3_MODE;
141 if (pdata->gpio_en_mask & ADP5520_GPIO_R3)
142 ctl_mask |= ADP5520_R3_MODE;
145 ret = adp5520_set_bits(dev->master, ADP5520_LED_CONTROL,
148 ret |= adp5520_set_bits(dev->master, ADP5520_GPIO_PULLUP,
149 pdata->gpio_pullup_mask);
152 dev_err(&pdev->dev, "failed to write\n");
156 ret = gpiochip_add(&dev->gpio_chip);
160 platform_set_drvdata(pdev, dev);
167 static int adp5520_gpio_remove(struct platform_device *pdev)
169 struct adp5520_gpio *dev;
171 dev = platform_get_drvdata(pdev);
172 gpiochip_remove(&dev->gpio_chip);
177 static struct platform_driver adp5520_gpio_driver = {
179 .name = "adp5520-gpio",
181 .probe = adp5520_gpio_probe,
182 .remove = adp5520_gpio_remove,
185 module_platform_driver(adp5520_gpio_driver);
187 MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
188 MODULE_DESCRIPTION("GPIO ADP5520 Driver");
189 MODULE_LICENSE("GPL");
190 MODULE_ALIAS("platform:adp5520-gpio");