--- /dev/null
+/*
+ * 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>
+
+#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
+#define DA9052_IRQ_GPI0 16
+#define DA9052_GPIO_ODD_SHIFT 7
+#define DA9052_GPIO_EVEN_SHIFT 3
+
+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);
+ int ret;
+
+ if (da9052_gpio_port_odd(offset)) {
+ ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
+ DA9052_GPIO_0_1_REG,
+ DA9052_GPIO_ODD_PORT_MODE,
+ value << DA9052_GPIO_ODD_SHIFT);
+ if (ret != 0)
+ dev_err(gpio->da9052->dev,
+ "Failed to updated gpio odd reg,%d",
+ ret);
+ } else {
+ ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
+ DA9052_GPIO_0_1_REG,
+ DA9052_GPIO_EVEN_PORT_MODE,
+ value << DA9052_GPIO_EVEN_SHIFT);
+ 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;
+
+ int irq;
+
+ irq = regmap_irq_get_virq(da9052->irq_data, DA9052_IRQ_GPI0 + offset);
+
+ return irq;
+}
+
+static struct gpio_chip reference_gp = {
+ .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 = true,
+ .ngpio = 16,
+ .base = -1,
+};
+
+static int da9052_gpio_probe(struct platform_device *pdev)
+{
+ struct da9052_gpio *gpio;
+ struct da9052_pdata *pdata;
+ int ret;
+
+ gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
+ if (!gpio)
+ return -ENOMEM;
+
+ gpio->da9052 = dev_get_drvdata(pdev->dev.parent);
+ pdata = dev_get_platdata(gpio->da9052->dev);
+
+ 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);
+ return ret;
+ }
+
+ platform_set_drvdata(pdev, gpio);
+
+ return 0;
+}
+
+static int da9052_gpio_remove(struct platform_device *pdev)
+{
+ struct da9052_gpio *gpio = platform_get_drvdata(pdev);
+
+ gpiochip_remove(&gpio->gp);
+ return 0;
+}
+
+static struct platform_driver da9052_gpio_driver = {
+ .probe = da9052_gpio_probe,
+ .remove = da9052_gpio_remove,
+ .driver = {
+ .name = "da9052-gpio",
+ },
+};
+
+module_platform_driver(da9052_gpio_driver);
+
+MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
+MODULE_DESCRIPTION("DA9052 GPIO Device Driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:da9052-gpio");
Code Review / kvmfornfv.git / blobdiff