2 * GPIO Chip driver for Analog Devices
3 * ADP5588 I/O Expander and QWERTY Keypad Controller
5 * Copyright 2009 Analog Devices Inc.
7 * Licensed under the GPL-2 or later.
10 #include <linux/module.h>
11 #include <linux/kernel.h>
12 #include <linux/slab.h>
13 #include <linux/init.h>
14 #include <linux/i2c.h>
15 #include <linux/gpio.h>
17 #include <linux/i2c/adp5588.h>
19 #define DRV_NAME "adp5588-gpio"
21 #define ADP_BANK(offs) ((offs) >> 3)
22 #define ADP_BIT(offs) (1u << ((offs) & 0x7))
25 struct i2c_client *client;
26 struct gpio_chip gpio_chip;
27 struct mutex lock; /* protect cached dir, dat_out */
33 static int adp5588_gpio_read(struct i2c_client *client, u8 reg)
35 int ret = i2c_smbus_read_byte_data(client, reg);
38 dev_err(&client->dev, "Read Error\n");
43 static int adp5588_gpio_write(struct i2c_client *client, u8 reg, u8 val)
45 int ret = i2c_smbus_write_byte_data(client, reg, val);
48 dev_err(&client->dev, "Write Error\n");
53 static int adp5588_gpio_get_value(struct gpio_chip *chip, unsigned off)
55 struct adp5588_gpio *dev =
56 container_of(chip, struct adp5588_gpio, gpio_chip);
58 return !!(adp5588_gpio_read(dev->client, GPIO_DAT_STAT1 + ADP_BANK(off))
62 static void adp5588_gpio_set_value(struct gpio_chip *chip,
63 unsigned off, int val)
66 struct adp5588_gpio *dev =
67 container_of(chip, struct adp5588_gpio, gpio_chip);
72 mutex_lock(&dev->lock);
74 dev->dat_out[bank] |= bit;
76 dev->dat_out[bank] &= ~bit;
78 adp5588_gpio_write(dev->client, GPIO_DAT_OUT1 + bank,
80 mutex_unlock(&dev->lock);
83 static int adp5588_gpio_direction_input(struct gpio_chip *chip, unsigned off)
87 struct adp5588_gpio *dev =
88 container_of(chip, struct adp5588_gpio, gpio_chip);
92 mutex_lock(&dev->lock);
93 dev->dir[bank] &= ~ADP_BIT(off);
94 ret = adp5588_gpio_write(dev->client, GPIO_DIR1 + bank, dev->dir[bank]);
95 mutex_unlock(&dev->lock);
100 static int adp5588_gpio_direction_output(struct gpio_chip *chip,
101 unsigned off, int val)
105 struct adp5588_gpio *dev =
106 container_of(chip, struct adp5588_gpio, gpio_chip);
108 bank = ADP_BANK(off);
111 mutex_lock(&dev->lock);
112 dev->dir[bank] |= bit;
115 dev->dat_out[bank] |= bit;
117 dev->dat_out[bank] &= ~bit;
119 ret = adp5588_gpio_write(dev->client, GPIO_DAT_OUT1 + bank,
121 ret |= adp5588_gpio_write(dev->client, GPIO_DIR1 + bank,
123 mutex_unlock(&dev->lock);
128 static int __devinit adp5588_gpio_probe(struct i2c_client *client,
129 const struct i2c_device_id *id)
131 struct adp5588_gpio_platform_data *pdata = client->dev.platform_data;
132 struct adp5588_gpio *dev;
133 struct gpio_chip *gc;
137 dev_err(&client->dev, "missing platform data\n");
141 if (!i2c_check_functionality(client->adapter,
142 I2C_FUNC_SMBUS_BYTE_DATA)) {
143 dev_err(&client->dev, "SMBUS Byte Data not Supported\n");
147 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
149 dev_err(&client->dev, "failed to alloc memory\n");
153 dev->client = client;
155 gc = &dev->gpio_chip;
156 gc->direction_input = adp5588_gpio_direction_input;
157 gc->direction_output = adp5588_gpio_direction_output;
158 gc->get = adp5588_gpio_get_value;
159 gc->set = adp5588_gpio_set_value;
162 gc->base = pdata->gpio_start;
164 gc->label = client->name;
165 gc->owner = THIS_MODULE;
167 mutex_init(&dev->lock);
170 ret = adp5588_gpio_read(dev->client, DEV_ID);
174 revid = ret & ADP5588_DEVICE_ID_MASK;
176 for (i = 0, ret = 0; i <= ADP_BANK(MAXGPIO); i++) {
177 dev->dat_out[i] = adp5588_gpio_read(client, GPIO_DAT_OUT1 + i);
178 dev->dir[i] = adp5588_gpio_read(client, GPIO_DIR1 + i);
179 ret |= adp5588_gpio_write(client, KP_GPIO1 + i, 0);
180 ret |= adp5588_gpio_write(client, GPIO_PULL1 + i,
181 (pdata->pullup_dis_mask >> (8 * i)) & 0xFF);
187 ret = gpiochip_add(&dev->gpio_chip);
191 dev_info(&client->dev, "gpios %d..%d on a %s Rev. %d\n",
192 gc->base, gc->base + gc->ngpio - 1,
193 client->name, revid);
196 ret = pdata->setup(client, gc->base, gc->ngpio, pdata->context);
198 dev_warn(&client->dev, "setup failed, %d\n", ret);
201 i2c_set_clientdata(client, dev);
209 static int __devexit adp5588_gpio_remove(struct i2c_client *client)
211 struct adp5588_gpio_platform_data *pdata = client->dev.platform_data;
212 struct adp5588_gpio *dev = i2c_get_clientdata(client);
215 if (pdata->teardown) {
216 ret = pdata->teardown(client,
217 dev->gpio_chip.base, dev->gpio_chip.ngpio,
220 dev_err(&client->dev, "teardown failed %d\n", ret);
225 ret = gpiochip_remove(&dev->gpio_chip);
227 dev_err(&client->dev, "gpiochip_remove failed %d\n", ret);
235 static const struct i2c_device_id adp5588_gpio_id[] = {
240 MODULE_DEVICE_TABLE(i2c, adp5588_gpio_id);
242 static struct i2c_driver adp5588_gpio_driver = {
246 .probe = adp5588_gpio_probe,
247 .remove = __devexit_p(adp5588_gpio_remove),
248 .id_table = adp5588_gpio_id,
251 static int __init adp5588_gpio_init(void)
253 return i2c_add_driver(&adp5588_gpio_driver);
256 module_init(adp5588_gpio_init);
258 static void __exit adp5588_gpio_exit(void)
260 i2c_del_driver(&adp5588_gpio_driver);
263 module_exit(adp5588_gpio_exit);
265 MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
266 MODULE_DESCRIPTION("GPIO ADP5588 Driver");
267 MODULE_LICENSE("GPL");