gpio: gpio support for ADP5520/ADP5501 MFD PMICs

Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>
Signed-off-by: Mike Frysinger <vapier@gentoo.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>

3 files changed, 217 insertions, 0 deletions

diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 9ad20ffdbf8c..2ad0128c63c6 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -162,6 +162,16 @@ config GPIO_WM831X
           Say yes here to access the GPIO signals of WM831x power management
           chips from Wolfson Microelectronics.
 
+config GPIO_ADP5520
+        tristate "GPIO Support for ADP5520 PMIC"
+        depends on PMIC_ADP5520
+        help
+          This option enables support for on-chip GPIO found
+          on Analog Devices ADP5520 PMICs.
+
+          To compile this driver as a module, choose M here: the module will
+          be called adp5520-gpio.
+
 comment "PCI GPIO expanders:"
 
 config GPIO_BT8XX
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index b8eef768387f..00a532c9a1e2 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -4,6 +4,7 @@ ccflags-$(CONFIG_DEBUG_GPIO)	+= -DDEBUG
 
 obj-$(CONFIG_GPIOLIB)           += gpiolib.o
 
+obj-$(CONFIG_GPIO_ADP5520)      += adp5520-gpio.o
 obj-$(CONFIG_GPIO_LANGWELL)     += langwell_gpio.o
 obj-$(CONFIG_GPIO_MAX7301)      += max7301.o
 obj-$(CONFIG_GPIO_MAX732X)      += max732x.o
diff --git a/drivers/gpio/adp5520-gpio.c b/drivers/gpio/adp5520-gpio.c
new file mode 100644
index 000000000000..ad05bbc7ffd5
--- /dev/null
+++ b/drivers/gpio/adp5520-gpio.c
@@ -0,0 +1,206 @@
+/*
+ * GPIO driver for Analog Devices ADP5520 MFD PMICs
+ *
+ * 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/platform_device.h>
+#include <linux/mfd/adp5520.h>
+
+#include <linux/gpio.h>
+
+struct adp5520_gpio {
+        struct device *master;
+        struct gpio_chip gpio_chip;
+        unsigned char lut[ADP5520_MAXGPIOS];
+        unsigned long output;
+};
+
+static int adp5520_gpio_get_value(struct gpio_chip *chip, unsigned off)
+{
+        struct adp5520_gpio *dev;
+        uint8_t reg_val;
+
+        dev = container_of(chip, struct adp5520_gpio, gpio_chip);
+
+        /*
+         * There are dedicated registers for GPIO IN/OUT.
+         * Make sure we return the right value, even when configured as output
+         */
+
+        if (test_bit(off, &dev->output))
+                adp5520_read(dev->master, GPIO_OUT, &reg_val);
+        else
+                adp5520_read(dev->master, GPIO_IN, &reg_val);
+
+        return !!(reg_val & dev->lut[off]);
+}
+
+static void adp5520_gpio_set_value(struct gpio_chip *chip,
+                unsigned off, int val)
+{
+        struct adp5520_gpio *dev;
+        dev = container_of(chip, struct adp5520_gpio, gpio_chip);
+
+        if (val)
+                adp5520_set_bits(dev->master, GPIO_OUT, dev->lut[off]);
+        else
+                adp5520_clr_bits(dev->master, GPIO_OUT, dev->lut[off]);
+}
+
+static int adp5520_gpio_direction_input(struct gpio_chip *chip, unsigned off)
+{
+        struct adp5520_gpio *dev;
+        dev = container_of(chip, struct adp5520_gpio, gpio_chip);
+
+        clear_bit(off, &dev->output);
+
+        return adp5520_clr_bits(dev->master, GPIO_CFG_2, dev->lut[off]);
+}
+
+static int adp5520_gpio_direction_output(struct gpio_chip *chip,
+                unsigned off, int val)
+{
+        struct adp5520_gpio *dev;
+        int ret = 0;
+        dev = container_of(chip, struct adp5520_gpio, gpio_chip);
+
+        set_bit(off, &dev->output);
+
+        if (val)
+                ret |= adp5520_set_bits(dev->master, GPIO_OUT, dev->lut[off]);
+        else
+                ret |= adp5520_clr_bits(dev->master, GPIO_OUT, dev->lut[off]);
+
+        ret |= adp5520_set_bits(dev->master, GPIO_CFG_2, dev->lut[off]);
+
+        return ret;
+}
+
+static int __devinit adp5520_gpio_probe(struct platform_device *pdev)
+{
+        struct adp5520_gpio_platfrom_data *pdata = pdev->dev.platform_data;
+        struct adp5520_gpio *dev;
+        struct gpio_chip *gc;
+        int ret, i, gpios;
+        unsigned char ctl_mask = 0;
+
+        if (pdata == NULL) {
+                dev_err(&pdev->dev, "missing platform data\n");
+                return -ENODEV;
+        }
+
+        if (pdev->id != ID_ADP5520) {
+                dev_err(&pdev->dev, "only ADP5520 supports GPIO\n");
+                return -ENODEV;
+        }
+
+        dev = kzalloc(sizeof(*dev), GFP_KERNEL);
+        if (dev == NULL) {
+                dev_err(&pdev->dev, "failed to alloc memory\n");
+                return -ENOMEM;
+        }
+
+        dev->master = pdev->dev.parent;
+
+        for (gpios = 0, i = 0; i < ADP5520_MAXGPIOS; i++)
+                if (pdata->gpio_en_mask & (1 << i))
+                        dev->lut[gpios++] = 1 << i;
+
+        if (gpios < 1) {
+                ret = -EINVAL;
+                goto err;
+        }
+
+        gc = &dev->gpio_chip;
+        gc->direction_input  = adp5520_gpio_direction_input;
+        gc->direction_output = adp5520_gpio_direction_output;
+        gc->get = adp5520_gpio_get_value;
+        gc->set = adp5520_gpio_set_value;
+        gc->can_sleep = 1;
+
+        gc->base = pdata->gpio_start;
+        gc->ngpio = gpios;
+        gc->label = pdev->name;
+        gc->owner = THIS_MODULE;
+
+        ret = adp5520_clr_bits(dev->master, GPIO_CFG_1,
+                pdata->gpio_en_mask);
+
+        if (pdata->gpio_en_mask & GPIO_C3)
+                ctl_mask |= C3_MODE;
+
+        if (pdata->gpio_en_mask & GPIO_R3)
+                ctl_mask |= R3_MODE;
+
+        if (ctl_mask)
+                ret = adp5520_set_bits(dev->master, LED_CONTROL,
+                        ctl_mask);
+
+        ret |= adp5520_set_bits(dev->master, GPIO_PULLUP,
+                pdata->gpio_pullup_mask);
+
+        if (ret) {
+                dev_err(&pdev->dev, "failed to write\n");
+                goto err;
+        }
+
+        ret = gpiochip_add(&dev->gpio_chip);
+        if (ret)
+                goto err;
+
+        platform_set_drvdata(pdev, dev);
+        return 0;
+
+err:
+        kfree(dev);
+        return ret;
+}
+
+static int __devexit adp5520_gpio_remove(struct platform_device *pdev)
+{
+        struct adp5520_gpio *dev;
+        int ret;
+
+        dev = platform_get_drvdata(pdev);
+        ret = gpiochip_remove(&dev->gpio_chip);
+        if (ret) {
+                dev_err(&pdev->dev, "%s failed, %d\n",
+                                "gpiochip_remove()", ret);
+                return ret;
+        }
+
+        kfree(dev);
+        return 0;
+}
+
+static struct platform_driver adp5520_gpio_driver = {
+        .driver = {
+                .name   = "adp5520-gpio",
+                .owner  = THIS_MODULE,
+        },
+        .probe          = adp5520_gpio_probe,
+        .remove         = __devexit_p(adp5520_gpio_remove),
+};
+
+static int __init adp5520_gpio_init(void)
+{
+        return platform_driver_register(&adp5520_gpio_driver);
+}
+module_init(adp5520_gpio_init);
+
+static void __exit adp5520_gpio_exit(void)
+{
+        platform_driver_unregister(&adp5520_gpio_driver);
+}
+module_exit(adp5520_gpio_exit);
+
+MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
+MODULE_DESCRIPTION("GPIO ADP5520 Driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:adp5520-gpio");