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authorMark Brown <broonie@opensource.wolfsonmicro.com>2012-06-23 13:29:25 +0100
committerLinus Walleij <linus.walleij@linaro.org>2012-07-17 20:59:53 +0200
commit31ba56f274d60d0b84efae4d15a9cd3e0486fa8c (patch)
tree8a5a49462f4c88b7d1a915e3a1bd5dbcd31871a2 /drivers/gpio
parent0bdfeddc49a80eeb4544ae50b46db7ed695accb8 (diff)
gpiolib: Add support for Wolfson Microelectronics Arizona class devices
The Arizona class devices provide some GPIOs for use in the system. This driver provides support for these via gpiolib. Currently interrupts are not supported, normally the GPIOs are outputs only. Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com> [Fold in WM5110 support patch] Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/gpio')
-rw-r--r--drivers/gpio/Kconfig6
-rw-r--r--drivers/gpio/Makefile1
-rw-r--r--drivers/gpio/gpio-arizona.c163
3 files changed, 170 insertions, 0 deletions
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index c2dfa9f90b4..4002def0b52 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -253,6 +253,12 @@ config GPIO_GE_FPGA
comment "I2C GPIO expanders:"
+config GPIO_ARIZONA
+ tristate "Wolfson Microelectronics Arizona class devices"
+ depends on MFD_ARIZONA
+ help
+ Support for GPIOs on Wolfson Arizona class devices.
+
config GPIO_MAX7300
tristate "Maxim MAX7300 GPIO expander"
depends on I2C
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index 3a95b17dae8..d37048105a8 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -13,6 +13,7 @@ obj-$(CONFIG_GPIO_AB8500) += gpio-ab8500.o
obj-$(CONFIG_GPIO_ADP5520) += gpio-adp5520.o
obj-$(CONFIG_GPIO_ADP5588) += gpio-adp5588.o
obj-$(CONFIG_GPIO_AMD8111) += gpio-amd8111.o
+obj-$(CONFIG_GPIO_ARIZONA) += gpio-arizona.o
obj-$(CONFIG_GPIO_BT8XX) += gpio-bt8xx.o
obj-$(CONFIG_GPIO_CS5535) += gpio-cs5535.o
obj-$(CONFIG_GPIO_DA9052) += gpio-da9052.o
diff --git a/drivers/gpio/gpio-arizona.c b/drivers/gpio/gpio-arizona.c
new file mode 100644
index 00000000000..8740d2eb06f
--- /dev/null
+++ b/drivers/gpio/gpio-arizona.c
@@ -0,0 +1,163 @@
+/*
+ * gpiolib support for Wolfson Arizona class devices
+ *
+ * Copyright 2012 Wolfson Microelectronics PLC.
+ *
+ * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/gpio.h>
+#include <linux/platform_device.h>
+#include <linux/seq_file.h>
+
+#include <linux/mfd/arizona/core.h>
+#include <linux/mfd/arizona/pdata.h>
+#include <linux/mfd/arizona/registers.h>
+
+struct arizona_gpio {
+ struct arizona *arizona;
+ struct gpio_chip gpio_chip;
+};
+
+static inline struct arizona_gpio *to_arizona_gpio(struct gpio_chip *chip)
+{
+ return container_of(chip, struct arizona_gpio, gpio_chip);
+}
+
+static int arizona_gpio_direction_in(struct gpio_chip *chip, unsigned offset)
+{
+ struct arizona_gpio *arizona_gpio = to_arizona_gpio(chip);
+ struct arizona *arizona = arizona_gpio->arizona;
+
+ return regmap_update_bits(arizona->regmap, ARIZONA_GPIO1_CTRL + offset,
+ ARIZONA_GPN_DIR, ARIZONA_GPN_DIR);
+}
+
+static int arizona_gpio_get(struct gpio_chip *chip, unsigned offset)
+{
+ struct arizona_gpio *arizona_gpio = to_arizona_gpio(chip);
+ struct arizona *arizona = arizona_gpio->arizona;
+ unsigned int val;
+ int ret;
+
+ ret = regmap_read(arizona->regmap, ARIZONA_GPIO1_CTRL + offset, &val);
+ if (ret < 0)
+ return ret;
+
+ if (val & ARIZONA_GPN_LVL)
+ return 1;
+ else
+ return 0;
+}
+
+static int arizona_gpio_direction_out(struct gpio_chip *chip,
+ unsigned offset, int value)
+{
+ struct arizona_gpio *arizona_gpio = to_arizona_gpio(chip);
+ struct arizona *arizona = arizona_gpio->arizona;
+
+ if (value)
+ value = ARIZONA_GPN_LVL;
+
+ return regmap_update_bits(arizona->regmap, ARIZONA_GPIO1_CTRL + offset,
+ ARIZONA_GPN_DIR | ARIZONA_GPN_LVL, value);
+}
+
+static void arizona_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
+{
+ struct arizona_gpio *arizona_gpio = to_arizona_gpio(chip);
+ struct arizona *arizona = arizona_gpio->arizona;
+
+ if (value)
+ value = ARIZONA_GPN_LVL;
+
+ regmap_update_bits(arizona->regmap, ARIZONA_GPIO1_CTRL + offset,
+ ARIZONA_GPN_LVL, value);
+}
+
+static struct gpio_chip template_chip = {
+ .label = "arizona",
+ .owner = THIS_MODULE,
+ .direction_input = arizona_gpio_direction_in,
+ .get = arizona_gpio_get,
+ .direction_output = arizona_gpio_direction_out,
+ .set = arizona_gpio_set,
+ .can_sleep = 1,
+};
+
+static int __devinit arizona_gpio_probe(struct platform_device *pdev)
+{
+ struct arizona *arizona = dev_get_drvdata(pdev->dev.parent);
+ struct arizona_pdata *pdata = arizona->dev->platform_data;
+ struct arizona_gpio *arizona_gpio;
+ int ret;
+
+ arizona_gpio = devm_kzalloc(&pdev->dev, sizeof(*arizona_gpio),
+ GFP_KERNEL);
+ if (arizona_gpio == NULL)
+ return -ENOMEM;
+
+ arizona_gpio->arizona = arizona;
+ arizona_gpio->gpio_chip = template_chip;
+ arizona_gpio->gpio_chip.dev = &pdev->dev;
+
+ switch (arizona->type) {
+ case WM5102:
+ case WM5110:
+ arizona_gpio->gpio_chip.ngpio = 5;
+ break;
+ default:
+ dev_err(&pdev->dev, "Unknown chip variant %d\n",
+ arizona->type);
+ return -EINVAL;
+ }
+
+ if (pdata && pdata->gpio_base)
+ arizona_gpio->gpio_chip.base = pdata->gpio_base;
+ else
+ arizona_gpio->gpio_chip.base = -1;
+
+ ret = gpiochip_add(&arizona_gpio->gpio_chip);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "Could not register gpiochip, %d\n",
+ ret);
+ goto err;
+ }
+
+ platform_set_drvdata(pdev, arizona_gpio);
+
+ return ret;
+
+err:
+ return ret;
+}
+
+static int __devexit arizona_gpio_remove(struct platform_device *pdev)
+{
+ struct arizona_gpio *arizona_gpio = platform_get_drvdata(pdev);
+
+ return gpiochip_remove(&arizona_gpio->gpio_chip);
+}
+
+static struct platform_driver arizona_gpio_driver = {
+ .driver.name = "arizona-gpio",
+ .driver.owner = THIS_MODULE,
+ .probe = arizona_gpio_probe,
+ .remove = __devexit_p(arizona_gpio_remove),
+};
+
+module_platform_driver(arizona_gpio_driver);
+
+MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
+MODULE_DESCRIPTION("GPIO interface for Arizona devices");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:arizona-gpio");