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>

diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index a019b49..1f1d88a 100644 (file)
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -172,6 +172,15 @@ config GPIO_ADP5520
          To compile this driver as a module, choose M here: the module will
          be called adp5520-gpio.
 
+config GPIO_ADP5588
+       tristate "ADP5588 I2C GPIO expander"
+       depends on I2C
+       help
+         This option enables support for 18 GPIOs found
+         on Analog Devices ADP5588 GPIO Expanders.
+         To compile this driver as a module, choose M here: the module will be
+         called adp5588-gpio.
+
 comment "PCI GPIO expanders:"
 
 config GPIO_CS5535

diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index 52fe4cf..4868723 100644 (file)
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -5,6 +5,7 @@ ccflags-$(CONFIG_DEBUG_GPIO)    += -DDEBUG
 obj-$(CONFIG_GPIOLIB)          += gpiolib.o
 
 obj-$(CONFIG_GPIO_ADP5520)     += adp5520-gpio.o
+obj-$(CONFIG_GPIO_ADP5588)     += adp5588-gpio.o
 obj-$(CONFIG_GPIO_LANGWELL)    += langwell_gpio.o
 obj-$(CONFIG_GPIO_MAX7301)     += max7301.o
 obj-$(CONFIG_GPIO_MAX732X)     += max732x.o

diff --git a/drivers/gpio/adp5588-gpio.c b/drivers/gpio/adp5588-gpio.c
new file mode 100644 (file)
index 0000000..afc097a
--- /dev/null
+++ b/drivers/gpio/adp5588-gpio.c
@@ -0,0 +1,266 @@
+/*
+ * GPIO Chip driver for Analog Devices
+ * ADP5588 I/O Expander and QWERTY Keypad Controller
+ *
+ * Copyright 2009 Analog Devices Inc.
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/i2c.h>
+#include <linux/gpio.h>
+
+#include <linux/i2c/adp5588.h>
+
+#define DRV_NAME               "adp5588-gpio"
+#define MAXGPIO                        18
+#define ADP_BANK(offs)         ((offs) >> 3)
+#define ADP_BIT(offs)          (1u << ((offs) & 0x7))
+
+struct adp5588_gpio {
+       struct i2c_client *client;
+       struct gpio_chip gpio_chip;
+       struct mutex lock;      /* protect cached dir, dat_out */
+       unsigned gpio_start;
+       uint8_t dat_out[3];
+       uint8_t dir[3];
+};
+
+static int adp5588_gpio_read(struct i2c_client *client, u8 reg)
+{
+       int ret = i2c_smbus_read_byte_data(client, reg);
+
+       if (ret < 0)
+               dev_err(&client->dev, "Read Error\n");
+
+       return ret;
+}
+
+static int adp5588_gpio_write(struct i2c_client *client, u8 reg, u8 val)
+{
+       int ret = i2c_smbus_write_byte_data(client, reg, val);
+
+       if (ret < 0)
+               dev_err(&client->dev, "Write Error\n");
+
+       return ret;
+}
+
+static int adp5588_gpio_get_value(struct gpio_chip *chip, unsigned off)
+{
+       struct adp5588_gpio *dev =
+           container_of(chip, struct adp5588_gpio, gpio_chip);
+
+       return !!(adp5588_gpio_read(dev->client, GPIO_DAT_STAT1 + ADP_BANK(off))
+                 & ADP_BIT(off));
+}
+
+static void adp5588_gpio_set_value(struct gpio_chip *chip,
+                                  unsigned off, int val)
+{
+       unsigned bank, bit;
+       struct adp5588_gpio *dev =
+           container_of(chip, struct adp5588_gpio, gpio_chip);
+
+       bank = ADP_BANK(off);
+       bit = ADP_BIT(off);
+
+       mutex_lock(&dev->lock);
+       if (val)
+               dev->dat_out[bank] |= bit;
+       else
+               dev->dat_out[bank] &= ~bit;
+
+       adp5588_gpio_write(dev->client, GPIO_DAT_OUT1 + bank,
+                          dev->dat_out[bank]);
+       mutex_unlock(&dev->lock);
+}
+
+static int adp5588_gpio_direction_input(struct gpio_chip *chip, unsigned off)
+{
+       int ret;
+       unsigned bank;
+       struct adp5588_gpio *dev =
+           container_of(chip, struct adp5588_gpio, gpio_chip);
+
+       bank = ADP_BANK(off);
+
+       mutex_lock(&dev->lock);
+       dev->dir[bank] &= ~ADP_BIT(off);
+       ret = adp5588_gpio_write(dev->client, GPIO_DIR1 + bank, dev->dir[bank]);
+       mutex_unlock(&dev->lock);
+
+       return ret;
+}
+
+static int adp5588_gpio_direction_output(struct gpio_chip *chip,
+                                        unsigned off, int val)
+{
+       int ret;
+       unsigned bank, bit;
+       struct adp5588_gpio *dev =
+           container_of(chip, struct adp5588_gpio, gpio_chip);
+
+       bank = ADP_BANK(off);
+       bit = ADP_BIT(off);
+
+       mutex_lock(&dev->lock);
+       dev->dir[bank] |= bit;
+
+       if (val)
+               dev->dat_out[bank] |= bit;
+       else
+               dev->dat_out[bank] &= ~bit;
+
+       ret = adp5588_gpio_write(dev->client, GPIO_DAT_OUT1 + bank,
+                                dev->dat_out[bank]);
+       ret |= adp5588_gpio_write(dev->client, GPIO_DIR1 + bank,
+                                dev->dir[bank]);
+       mutex_unlock(&dev->lock);
+
+       return ret;
+}
+
+static int __devinit adp5588_gpio_probe(struct i2c_client *client,
+                                       const struct i2c_device_id *id)
+{
+       struct adp5588_gpio_platform_data *pdata = client->dev.platform_data;
+       struct adp5588_gpio *dev;
+       struct gpio_chip *gc;
+       int ret, i, revid;
+
+       if (pdata == NULL) {
+               dev_err(&client->dev, "missing platform data\n");
+               return -ENODEV;
+       }
+
+       if (!i2c_check_functionality(client->adapter,
+                                       I2C_FUNC_SMBUS_BYTE_DATA)) {
+               dev_err(&client->dev, "SMBUS Byte Data not Supported\n");
+               return -EIO;
+       }
+
+       dev = kzalloc(sizeof(*dev), GFP_KERNEL);
+       if (dev == NULL) {
+               dev_err(&client->dev, "failed to alloc memory\n");
+               return -ENOMEM;
+       }
+
+       dev->client = client;
+
+       gc = &dev->gpio_chip;
+       gc->direction_input = adp5588_gpio_direction_input;
+       gc->direction_output = adp5588_gpio_direction_output;
+       gc->get = adp5588_gpio_get_value;
+       gc->set = adp5588_gpio_set_value;
+       gc->can_sleep = 1;
+
+       gc->base = pdata->gpio_start;
+       gc->ngpio = MAXGPIO;
+       gc->label = client->name;
+       gc->owner = THIS_MODULE;
+
+       mutex_init(&dev->lock);
+
+
+       ret = adp5588_gpio_read(dev->client, DEV_ID);
+       if (ret < 0)
+               goto err;
+
+       revid = ret & ADP5588_DEVICE_ID_MASK;
+
+       for (i = 0, ret = 0; i <= ADP_BANK(MAXGPIO); i++) {
+               dev->dat_out[i] = adp5588_gpio_read(client, GPIO_DAT_OUT1 + i);
+               dev->dir[i] = adp5588_gpio_read(client, GPIO_DIR1 + i);
+               ret |= adp5588_gpio_write(client, KP_GPIO1 + i, 0);
+               ret |= adp5588_gpio_write(client, GPIO_PULL1 + i,
+                               (pdata->pullup_dis_mask >> (8 * i)) & 0xFF);
+
+               if (ret)
+                       goto err;
+       }
+
+       ret = gpiochip_add(&dev->gpio_chip);
+       if (ret)
+               goto err;
+
+       dev_info(&client->dev, "gpios %d..%d on a %s Rev. %d\n",
+                       gc->base, gc->base + gc->ngpio - 1,
+                       client->name, revid);
+
+       if (pdata->setup) {
+               ret = pdata->setup(client, gc->base, gc->ngpio, pdata->context);
+               if (ret < 0)
+                       dev_warn(&client->dev, "setup failed, %d\n", ret);
+       }
+
+       i2c_set_clientdata(client, dev);
+       return 0;
+
+err:
+       kfree(dev);
+       return ret;
+}
+
+static int __devexit adp5588_gpio_remove(struct i2c_client *client)
+{
+       struct adp5588_gpio_platform_data *pdata = client->dev.platform_data;
+       struct adp5588_gpio *dev = i2c_get_clientdata(client);
+       int ret;
+
+       if (pdata->teardown) {
+               ret = pdata->teardown(client,
+                                     dev->gpio_chip.base, dev->gpio_chip.ngpio,
+                                     pdata->context);
+               if (ret < 0) {
+                       dev_err(&client->dev, "teardown failed %d\n", ret);
+                       return ret;
+               }
+       }
+
+       ret = gpiochip_remove(&dev->gpio_chip);
+       if (ret) {
+               dev_err(&client->dev, "gpiochip_remove failed %d\n", ret);
+               return ret;
+       }
+
+       kfree(dev);
+       return 0;
+}
+
+static const struct i2c_device_id adp5588_gpio_id[] = {
+       {DRV_NAME, 0},
+       {}
+};
+
+MODULE_DEVICE_TABLE(i2c, adp5588_gpio_id);
+
+static struct i2c_driver adp5588_gpio_driver = {
+       .driver = {
+                  .name = DRV_NAME,
+                  },
+       .probe = adp5588_gpio_probe,
+       .remove = __devexit_p(adp5588_gpio_remove),
+       .id_table = adp5588_gpio_id,
+};
+
+static int __init adp5588_gpio_init(void)
+{
+       return i2c_add_driver(&adp5588_gpio_driver);
+}
+
+module_init(adp5588_gpio_init);
+
+static void __exit adp5588_gpio_exit(void)
+{
+       i2c_del_driver(&adp5588_gpio_driver);
+}
+
+module_exit(adp5588_gpio_exit);
+
+MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
+MODULE_DESCRIPTION("GPIO ADP5588 Driver");
+MODULE_LICENSE("GPL");

diff --git a/include/linux/i2c/adp5588.h b/include/linux/i2c/adp5588.h
index fc5db82..02c9af3 100644 (file)
--- a/include/linux/i2c/adp5588.h
+++ b/include/linux/i2c/adp5588.h
@@ -89,4 +89,16 @@ struct adp5588_kpad_platform_data {
        unsigned short unlock_key2;     /* Unlock Key 2 */
 };
 
+struct adp5588_gpio_platform_data {
+       unsigned gpio_start;            /* GPIO Chip base # */
+       unsigned pullup_dis_mask;       /* Pull-Up Disable Mask */
+       int     (*setup)(struct i2c_client *client,
+                               int gpio, unsigned ngpio,
+                               void *context);
+       int     (*teardown)(struct i2c_client *client,
+                               int gpio, unsigned ngpio,
+                               void *context);
+       void    *context;
+};
+
 #endif