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https://github.com/joel16/android_kernel_sony_msm8994_rework.git
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gpio: adp5588-gpio: new driver for ADP5588 GPIO expanders
Signed-off-by: Michael Hennerich <michael.hennerich@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org> Cc: Jean Delvare <khali@linux-fr.org> Cc: David Brownell <david-b@pacbell.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Michael Hennerich
Linus Torvalds
parent
5787536edf
commit
80884094e3
@ -172,6 +172,15 @@ config GPIO_ADP5520
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To compile this driver as a module, choose M here: the module will
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be called adp5520-gpio.
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config GPIO_ADP5588
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tristate "ADP5588 I2C GPIO expander"
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depends on I2C
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help
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This option enables support for 18 GPIOs found
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on Analog Devices ADP5588 GPIO Expanders.
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To compile this driver as a module, choose M here: the module will be
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called adp5588-gpio.
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comment "PCI GPIO expanders:"
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config GPIO_CS5535
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@ -5,6 +5,7 @@ ccflags-$(CONFIG_DEBUG_GPIO) += -DDEBUG
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obj-$(CONFIG_GPIOLIB) += gpiolib.o
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obj-$(CONFIG_GPIO_ADP5520) += adp5520-gpio.o
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obj-$(CONFIG_GPIO_ADP5588) += adp5588-gpio.o
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obj-$(CONFIG_GPIO_LANGWELL) += langwell_gpio.o
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obj-$(CONFIG_GPIO_MAX7301) += max7301.o
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obj-$(CONFIG_GPIO_MAX732X) += max732x.o
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266
drivers/gpio/adp5588-gpio.c
Normal file
266
drivers/gpio/adp5588-gpio.c
Normal file
@ -0,0 +1,266 @@
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/*
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* GPIO Chip driver for Analog Devices
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* ADP5588 I/O Expander and QWERTY Keypad Controller
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*
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* Copyright 2009 Analog Devices Inc.
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*
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* Licensed under the GPL-2 or later.
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/i2c.h>
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#include <linux/gpio.h>
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#include <linux/i2c/adp5588.h>
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#define DRV_NAME "adp5588-gpio"
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#define MAXGPIO 18
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#define ADP_BANK(offs) ((offs) >> 3)
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#define ADP_BIT(offs) (1u << ((offs) & 0x7))
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struct adp5588_gpio {
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struct i2c_client *client;
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struct gpio_chip gpio_chip;
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struct mutex lock; /* protect cached dir, dat_out */
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unsigned gpio_start;
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uint8_t dat_out[3];
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uint8_t dir[3];
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};
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static int adp5588_gpio_read(struct i2c_client *client, u8 reg)
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{
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int ret = i2c_smbus_read_byte_data(client, reg);
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if (ret < 0)
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dev_err(&client->dev, "Read Error\n");
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return ret;
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}
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static int adp5588_gpio_write(struct i2c_client *client, u8 reg, u8 val)
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{
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int ret = i2c_smbus_write_byte_data(client, reg, val);
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if (ret < 0)
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dev_err(&client->dev, "Write Error\n");
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return ret;
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}
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static int adp5588_gpio_get_value(struct gpio_chip *chip, unsigned off)
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{
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struct adp5588_gpio *dev =
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container_of(chip, struct adp5588_gpio, gpio_chip);
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return !!(adp5588_gpio_read(dev->client, GPIO_DAT_STAT1 + ADP_BANK(off))
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& ADP_BIT(off));
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}
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static void adp5588_gpio_set_value(struct gpio_chip *chip,
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unsigned off, int val)
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{
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unsigned bank, bit;
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struct adp5588_gpio *dev =
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container_of(chip, struct adp5588_gpio, gpio_chip);
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bank = ADP_BANK(off);
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bit = ADP_BIT(off);
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mutex_lock(&dev->lock);
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if (val)
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dev->dat_out[bank] |= bit;
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else
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dev->dat_out[bank] &= ~bit;
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adp5588_gpio_write(dev->client, GPIO_DAT_OUT1 + bank,
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dev->dat_out[bank]);
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mutex_unlock(&dev->lock);
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}
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static int adp5588_gpio_direction_input(struct gpio_chip *chip, unsigned off)
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{
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int ret;
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unsigned bank;
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struct adp5588_gpio *dev =
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container_of(chip, struct adp5588_gpio, gpio_chip);
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bank = ADP_BANK(off);
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mutex_lock(&dev->lock);
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dev->dir[bank] &= ~ADP_BIT(off);
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ret = adp5588_gpio_write(dev->client, GPIO_DIR1 + bank, dev->dir[bank]);
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mutex_unlock(&dev->lock);
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return ret;
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}
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static int adp5588_gpio_direction_output(struct gpio_chip *chip,
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unsigned off, int val)
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{
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int ret;
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unsigned bank, bit;
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struct adp5588_gpio *dev =
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container_of(chip, struct adp5588_gpio, gpio_chip);
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bank = ADP_BANK(off);
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bit = ADP_BIT(off);
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mutex_lock(&dev->lock);
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dev->dir[bank] |= bit;
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if (val)
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dev->dat_out[bank] |= bit;
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else
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dev->dat_out[bank] &= ~bit;
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ret = adp5588_gpio_write(dev->client, GPIO_DAT_OUT1 + bank,
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dev->dat_out[bank]);
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ret |= adp5588_gpio_write(dev->client, GPIO_DIR1 + bank,
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dev->dir[bank]);
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mutex_unlock(&dev->lock);
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return ret;
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}
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static int __devinit adp5588_gpio_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct adp5588_gpio_platform_data *pdata = client->dev.platform_data;
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struct adp5588_gpio *dev;
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struct gpio_chip *gc;
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int ret, i, revid;
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if (pdata == NULL) {
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dev_err(&client->dev, "missing platform data\n");
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return -ENODEV;
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}
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if (!i2c_check_functionality(client->adapter,
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I2C_FUNC_SMBUS_BYTE_DATA)) {
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dev_err(&client->dev, "SMBUS Byte Data not Supported\n");
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return -EIO;
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}
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dev = kzalloc(sizeof(*dev), GFP_KERNEL);
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if (dev == NULL) {
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dev_err(&client->dev, "failed to alloc memory\n");
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return -ENOMEM;
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}
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dev->client = client;
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gc = &dev->gpio_chip;
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gc->direction_input = adp5588_gpio_direction_input;
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gc->direction_output = adp5588_gpio_direction_output;
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gc->get = adp5588_gpio_get_value;
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gc->set = adp5588_gpio_set_value;
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gc->can_sleep = 1;
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gc->base = pdata->gpio_start;
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gc->ngpio = MAXGPIO;
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gc->label = client->name;
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gc->owner = THIS_MODULE;
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mutex_init(&dev->lock);
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ret = adp5588_gpio_read(dev->client, DEV_ID);
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if (ret < 0)
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goto err;
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revid = ret & ADP5588_DEVICE_ID_MASK;
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for (i = 0, ret = 0; i <= ADP_BANK(MAXGPIO); i++) {
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dev->dat_out[i] = adp5588_gpio_read(client, GPIO_DAT_OUT1 + i);
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dev->dir[i] = adp5588_gpio_read(client, GPIO_DIR1 + i);
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ret |= adp5588_gpio_write(client, KP_GPIO1 + i, 0);
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ret |= adp5588_gpio_write(client, GPIO_PULL1 + i,
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(pdata->pullup_dis_mask >> (8 * i)) & 0xFF);
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if (ret)
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goto err;
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}
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ret = gpiochip_add(&dev->gpio_chip);
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if (ret)
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goto err;
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dev_info(&client->dev, "gpios %d..%d on a %s Rev. %d\n",
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gc->base, gc->base + gc->ngpio - 1,
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client->name, revid);
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if (pdata->setup) {
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ret = pdata->setup(client, gc->base, gc->ngpio, pdata->context);
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if (ret < 0)
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dev_warn(&client->dev, "setup failed, %d\n", ret);
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}
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i2c_set_clientdata(client, dev);
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return 0;
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err:
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kfree(dev);
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return ret;
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}
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static int __devexit adp5588_gpio_remove(struct i2c_client *client)
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{
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struct adp5588_gpio_platform_data *pdata = client->dev.platform_data;
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struct adp5588_gpio *dev = i2c_get_clientdata(client);
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int ret;
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if (pdata->teardown) {
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ret = pdata->teardown(client,
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dev->gpio_chip.base, dev->gpio_chip.ngpio,
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pdata->context);
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if (ret < 0) {
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dev_err(&client->dev, "teardown failed %d\n", ret);
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return ret;
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}
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}
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ret = gpiochip_remove(&dev->gpio_chip);
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if (ret) {
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dev_err(&client->dev, "gpiochip_remove failed %d\n", ret);
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return ret;
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}
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kfree(dev);
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return 0;
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}
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static const struct i2c_device_id adp5588_gpio_id[] = {
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{DRV_NAME, 0},
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{}
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};
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MODULE_DEVICE_TABLE(i2c, adp5588_gpio_id);
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static struct i2c_driver adp5588_gpio_driver = {
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.driver = {
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.name = DRV_NAME,
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},
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.probe = adp5588_gpio_probe,
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.remove = __devexit_p(adp5588_gpio_remove),
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.id_table = adp5588_gpio_id,
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};
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static int __init adp5588_gpio_init(void)
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{
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return i2c_add_driver(&adp5588_gpio_driver);
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}
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module_init(adp5588_gpio_init);
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static void __exit adp5588_gpio_exit(void)
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{
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i2c_del_driver(&adp5588_gpio_driver);
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}
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module_exit(adp5588_gpio_exit);
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MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
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MODULE_DESCRIPTION("GPIO ADP5588 Driver");
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MODULE_LICENSE("GPL");
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@ -89,4 +89,16 @@ struct adp5588_kpad_platform_data {
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unsigned short unlock_key2; /* Unlock Key 2 */
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};
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struct adp5588_gpio_platform_data {
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unsigned gpio_start; /* GPIO Chip base # */
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unsigned pullup_dis_mask; /* Pull-Up Disable Mask */
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int (*setup)(struct i2c_client *client,
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int gpio, unsigned ngpio,
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void *context);
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int (*teardown)(struct i2c_client *client,
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int gpio, unsigned ngpio,
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void *context);
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void *context;
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};
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#endif
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