GPIO: DA9052 GPIO module v3
ashishj3 [Wed, 6 Jul 2011 10:32:13 +0000 (15:32 +0530)]
DA9052 PMIC has 16 bit GPIO bus for peripheral control.

This patch add support for the GPIO pins on the DA9052.

Signed-off-by: David Dajun Chen <dchen@diasemi.com>
Signed-off-by: Ashish Jangam <ashish.jangam@kpitcummins.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>

drivers/gpio/Kconfig
drivers/gpio/Makefile
drivers/gpio/gpio-da9052.c [new file with mode: 0644]

index 9f06e63..a4ac78b 100644 (file)
@@ -68,6 +68,12 @@ config GPIO_GENERIC
 
 # put drivers in the right section, in alphabetical order
 
+config GPIO_DA9052
+       tristate "Dialog DA9052 GPIO"
+       depends on PMIC_DA9052
+       help
+         Say yes here to enable the GPIO driver for the DA9052 chip.
+
 config GPIO_MAX730X
        tristate
 
index 0fbdd75..b847fb5 100644 (file)
@@ -13,6 +13,7 @@ obj-$(CONFIG_GPIO_ADP5520)    += gpio-adp5520.o
 obj-$(CONFIG_GPIO_ADP5588)     += gpio-adp5588.o
 obj-$(CONFIG_GPIO_BT8XX)       += gpio-bt8xx.o
 obj-$(CONFIG_GPIO_CS5535)      += gpio-cs5535.o
+obj-$(CONFIG_GPIO_DA9052)      += gpio-da9052.o
 obj-$(CONFIG_GPIO_EP93XX)      += gpio-ep93xx.o
 obj-$(CONFIG_GPIO_EXYNOS4)     += gpio-exynos4.o
 obj-$(CONFIG_GPIO_IT8761E)     += gpio-it8761e.o
diff --git a/drivers/gpio/gpio-da9052.c b/drivers/gpio/gpio-da9052.c
new file mode 100644 (file)
index 0000000..c23761f
--- /dev/null
@@ -0,0 +1,278 @@
+/*
+ * GPIO Driver for Dialog DA9052 PMICs.
+ *
+ * Copyright(c) 2011 Dialog Semiconductor Ltd.
+ *
+ * Author: David Dajun Chen <dchen@diasemi.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/module.h>
+#include <linux/fs.h>
+#include <linux/uaccess.h>
+#include <linux/platform_device.h>
+#include <linux/gpio.h>
+#include <linux/syscalls.h>
+#include <linux/seq_file.h>
+
+#include <linux/mfd/da9052/da9052.h>
+#include <linux/mfd/da9052/reg.h>
+#include <linux/mfd/da9052/pdata.h>
+#include <linux/mfd/da9052/gpio.h>
+
+#define DA9052_INPUT                           1
+#define DA9052_OUTPUT_OPENDRAIN                2
+#define DA9052_OUTPUT_PUSHPULL                 3
+
+#define DA9052_SUPPLY_VDD_IO1                  0
+
+#define DA9052_DEBOUNCING_OFF                  0
+#define DA9052_DEBOUNCING_ON                   1
+
+#define DA9052_OUTPUT_LOWLEVEL                 0
+
+#define DA9052_ACTIVE_LOW                      0
+#define DA9052_ACTIVE_HIGH                     1
+
+#define DA9052_GPIO_MAX_PORTS_PER_REGISTER     8
+#define DA9052_GPIO_SHIFT_COUNT(no)            (no%8)
+#define DA9052_GPIO_MASK_UPPER_NIBBLE          0xF0
+#define DA9052_GPIO_MASK_LOWER_NIBBLE          0x0F
+#define DA9052_GPIO_NIBBLE_SHIFT               4
+
+struct da9052_gpio {
+       struct da9052 *da9052;
+       struct gpio_chip gp;
+};
+
+static inline struct da9052_gpio *to_da9052_gpio(struct gpio_chip *chip)
+{
+       return container_of(chip, struct da9052_gpio, gp);
+}
+
+static unsigned char da9052_gpio_port_odd(unsigned offset)
+{
+       return offset % 2;
+}
+
+static int da9052_gpio_get(struct gpio_chip *gc, unsigned offset)
+{
+       struct da9052_gpio *gpio = to_da9052_gpio(gc);
+       int da9052_port_direction = 0;
+       int ret;
+
+       ret = da9052_reg_read(gpio->da9052,
+                             DA9052_GPIO_0_1_REG + (offset >> 1));
+       if (ret < 0)
+               return ret;
+
+       if (da9052_gpio_port_odd(offset)) {
+               da9052_port_direction = ret & DA9052_GPIO_ODD_PORT_PIN;
+               da9052_port_direction >>= 4;
+       } else {
+               da9052_port_direction = ret & DA9052_GPIO_EVEN_PORT_PIN;
+       }
+
+       switch (da9052_port_direction) {
+       case DA9052_INPUT:
+               if (offset < DA9052_GPIO_MAX_PORTS_PER_REGISTER)
+                       ret = da9052_reg_read(gpio->da9052,
+                                             DA9052_STATUS_C_REG);
+               else
+                       ret = da9052_reg_read(gpio->da9052,
+                                             DA9052_STATUS_D_REG);
+               if (ret < 0)
+                       return ret;
+               if (ret & (1 << DA9052_GPIO_SHIFT_COUNT(offset)))
+                       return 1;
+               else
+                       return 0;
+       case DA9052_OUTPUT_PUSHPULL:
+               if (da9052_gpio_port_odd(offset))
+                       return ret & DA9052_GPIO_ODD_PORT_MODE;
+               else
+                       return ret & DA9052_GPIO_EVEN_PORT_MODE;
+       default:
+               return -EINVAL;
+       }
+}
+
+static void da9052_gpio_set(struct gpio_chip *gc, unsigned offset, int value)
+{
+       struct da9052_gpio *gpio = to_da9052_gpio(gc);
+       unsigned char register_value = 0;
+       int ret;
+
+       if (da9052_gpio_port_odd(offset)) {
+               if (value) {
+                       register_value = DA9052_GPIO_ODD_PORT_MODE;
+                       ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
+                                               DA9052_GPIO_0_1_REG,
+                                               DA9052_GPIO_ODD_PORT_MODE,
+                                               register_value);
+                       if (ret != 0)
+                               dev_err(gpio->da9052->dev,
+                                       "Failed to updated gpio odd reg,%d",
+                                       ret);
+               }
+       } else {
+               if (value) {
+                       register_value = DA9052_GPIO_EVEN_PORT_MODE;
+                       ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
+                                               DA9052_GPIO_0_1_REG,
+                                               DA9052_GPIO_EVEN_PORT_MODE,
+                                               register_value);
+                       if (ret != 0)
+                               dev_err(gpio->da9052->dev,
+                                       "Failed to updated gpio even reg,%d",
+                                       ret);
+               }
+       }
+}
+
+static int da9052_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
+{
+       struct da9052_gpio *gpio = to_da9052_gpio(gc);
+       unsigned char register_value;
+       int ret;
+
+       /* Format: function - 2 bits type - 1 bit mode - 1 bit */
+       register_value = DA9052_INPUT | DA9052_ACTIVE_LOW << 2 |
+                        DA9052_DEBOUNCING_ON << 3;
+
+       if (da9052_gpio_port_odd(offset))
+               ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
+                                       DA9052_GPIO_0_1_REG,
+                                       DA9052_GPIO_MASK_UPPER_NIBBLE,
+                                       (register_value <<
+                                       DA9052_GPIO_NIBBLE_SHIFT));
+       else
+               ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
+                                       DA9052_GPIO_0_1_REG,
+                                       DA9052_GPIO_MASK_LOWER_NIBBLE,
+                                       register_value);
+
+       return ret;
+}
+
+static int da9052_gpio_direction_output(struct gpio_chip *gc,
+                                       unsigned offset, int value)
+{
+       struct da9052_gpio *gpio = to_da9052_gpio(gc);
+       unsigned char register_value;
+       int ret;
+
+       /* Format: Function - 2 bits Type - 1 bit Mode - 1 bit */
+       register_value = DA9052_OUTPUT_PUSHPULL | DA9052_SUPPLY_VDD_IO1 << 2 |
+                        value << 3;
+
+       if (da9052_gpio_port_odd(offset))
+               ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
+                                       DA9052_GPIO_0_1_REG,
+                                       DA9052_GPIO_MASK_UPPER_NIBBLE,
+                                       (register_value <<
+                                       DA9052_GPIO_NIBBLE_SHIFT));
+       else
+               ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
+                                       DA9052_GPIO_0_1_REG,
+                                       DA9052_GPIO_MASK_LOWER_NIBBLE,
+                                       register_value);
+
+       return ret;
+}
+
+static int da9052_gpio_to_irq(struct gpio_chip *gc, u32 offset)
+{
+       struct da9052_gpio *gpio = to_da9052_gpio(gc);
+       struct da9052 *da9052 = gpio->da9052;
+
+       return da9052->irq_base + DA9052_IRQ_GPI0 + offset;
+}
+
+static struct gpio_chip reference_gp __devinitdata = {
+       .label = "da9052-gpio",
+       .owner = THIS_MODULE,
+       .get = da9052_gpio_get,
+       .set = da9052_gpio_set,
+       .direction_input = da9052_gpio_direction_input,
+       .direction_output = da9052_gpio_direction_output,
+       .to_irq = da9052_gpio_to_irq,
+       .can_sleep = 1;
+       .ngpio = 16;
+       .base = -1;
+};
+
+static int __devinit da9052_gpio_probe(struct platform_device *pdev)
+{
+       struct da9052_gpio *gpio;
+       struct da9052_pdata *pdata;
+       int ret;
+
+       gpio = kzalloc(sizeof(*gpio), GFP_KERNEL);
+       if (gpio == NULL)
+               return -ENOMEM;
+
+       gpio->da9052 = dev_get_drvdata(pdev->dev.parent);
+       pdata = gpio->da9052->dev->platform_data;
+
+       gpio->da9052 = dev_get_drvdata(pdev->dev.parent);
+       gpio->gp = reference_gp;
+       if (pdata && pdata->gpio_base)
+               gpio->gp.base = pdata->gpio_base;
+
+       ret = gpiochip_add(&gpio->gp);
+       if (ret < 0) {
+               dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
+               goto err_mem;
+       }
+
+       platform_set_drvdata(pdev, gpio);
+
+       return 0;
+
+err_mem:
+       kfree(gpio);
+       return ret;
+}
+
+static int __devexit da9052_gpio_remove(struct platform_device *pdev)
+{
+       struct da9052_gpio *gpio = platform_get_drvdata(pdev);
+       int ret;
+
+       ret = gpiochip_remove(&gpio->gp);
+       if (ret == 0)
+               kfree(gpio);
+
+       return ret;
+}
+
+static struct platform_driver da9052_gpio_driver = {
+       .probe = da9052_gpio_probe,
+       .remove = __devexit_p(da9052_gpio_remove),
+       .driver = {
+               .name   = "da9052-gpio",
+               .owner  = THIS_MODULE,
+       },
+};
+
+static int __init da9052_gpio_init(void)
+{
+       return platform_driver_register(&da9052_gpio_driver);
+}
+module_init(da9052_gpio_init);
+
+static void __exit da9052_gpio_exit(void)
+{
+       return platform_driver_unregister(&da9052_gpio_driver);
+}
+module_exit(da9052_gpio_exit);
+
+MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
+MODULE_DESCRIPTION("DA9052 GPIO Device Driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:da9052-gpio");