278 lines
6.7 KiB
C
278 lines
6.7 KiB
C
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/*
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* GPIO Driver for Dialog DA9052 PMICs.
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*
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* Copyright(c) 2011 Dialog Semiconductor Ltd.
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*
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* Author: David Dajun Chen <dchen@diasemi.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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*/
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#include <linux/module.h>
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#include <linux/fs.h>
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#include <linux/uaccess.h>
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#include <linux/platform_device.h>
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#include <linux/gpio.h>
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#include <linux/syscalls.h>
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#include <linux/seq_file.h>
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#include <linux/mfd/da9052/da9052.h>
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#include <linux/mfd/da9052/reg.h>
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#include <linux/mfd/da9052/pdata.h>
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#include <linux/mfd/da9052/gpio.h>
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#define DA9052_INPUT 1
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#define DA9052_OUTPUT_OPENDRAIN 2
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#define DA9052_OUTPUT_PUSHPULL 3
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#define DA9052_SUPPLY_VDD_IO1 0
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#define DA9052_DEBOUNCING_OFF 0
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#define DA9052_DEBOUNCING_ON 1
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#define DA9052_OUTPUT_LOWLEVEL 0
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#define DA9052_ACTIVE_LOW 0
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#define DA9052_ACTIVE_HIGH 1
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#define DA9052_GPIO_MAX_PORTS_PER_REGISTER 8
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#define DA9052_GPIO_SHIFT_COUNT(no) (no%8)
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#define DA9052_GPIO_MASK_UPPER_NIBBLE 0xF0
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#define DA9052_GPIO_MASK_LOWER_NIBBLE 0x0F
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#define DA9052_GPIO_NIBBLE_SHIFT 4
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struct da9052_gpio {
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struct da9052 *da9052;
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struct gpio_chip gp;
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};
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static inline struct da9052_gpio *to_da9052_gpio(struct gpio_chip *chip)
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{
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return container_of(chip, struct da9052_gpio, gp);
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}
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static unsigned char da9052_gpio_port_odd(unsigned offset)
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{
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return offset % 2;
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}
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static int da9052_gpio_get(struct gpio_chip *gc, unsigned offset)
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{
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struct da9052_gpio *gpio = to_da9052_gpio(gc);
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int da9052_port_direction = 0;
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int ret;
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ret = da9052_reg_read(gpio->da9052,
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DA9052_GPIO_0_1_REG + (offset >> 1));
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if (ret < 0)
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return ret;
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if (da9052_gpio_port_odd(offset)) {
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da9052_port_direction = ret & DA9052_GPIO_ODD_PORT_PIN;
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da9052_port_direction >>= 4;
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} else {
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da9052_port_direction = ret & DA9052_GPIO_EVEN_PORT_PIN;
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}
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switch (da9052_port_direction) {
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case DA9052_INPUT:
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if (offset < DA9052_GPIO_MAX_PORTS_PER_REGISTER)
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ret = da9052_reg_read(gpio->da9052,
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DA9052_STATUS_C_REG);
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else
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ret = da9052_reg_read(gpio->da9052,
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DA9052_STATUS_D_REG);
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if (ret < 0)
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return ret;
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if (ret & (1 << DA9052_GPIO_SHIFT_COUNT(offset)))
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return 1;
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else
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return 0;
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case DA9052_OUTPUT_PUSHPULL:
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if (da9052_gpio_port_odd(offset))
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return ret & DA9052_GPIO_ODD_PORT_MODE;
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else
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return ret & DA9052_GPIO_EVEN_PORT_MODE;
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default:
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return -EINVAL;
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}
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}
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static void da9052_gpio_set(struct gpio_chip *gc, unsigned offset, int value)
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{
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struct da9052_gpio *gpio = to_da9052_gpio(gc);
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unsigned char register_value = 0;
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int ret;
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if (da9052_gpio_port_odd(offset)) {
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if (value) {
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register_value = DA9052_GPIO_ODD_PORT_MODE;
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ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
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DA9052_GPIO_0_1_REG,
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DA9052_GPIO_ODD_PORT_MODE,
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register_value);
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if (ret != 0)
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dev_err(gpio->da9052->dev,
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"Failed to updated gpio odd reg,%d",
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ret);
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}
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} else {
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if (value) {
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register_value = DA9052_GPIO_EVEN_PORT_MODE;
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ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
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DA9052_GPIO_0_1_REG,
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DA9052_GPIO_EVEN_PORT_MODE,
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register_value);
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if (ret != 0)
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dev_err(gpio->da9052->dev,
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"Failed to updated gpio even reg,%d",
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ret);
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}
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}
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}
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static int da9052_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
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{
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struct da9052_gpio *gpio = to_da9052_gpio(gc);
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unsigned char register_value;
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int ret;
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/* Format: function - 2 bits type - 1 bit mode - 1 bit */
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register_value = DA9052_INPUT | DA9052_ACTIVE_LOW << 2 |
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DA9052_DEBOUNCING_ON << 3;
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if (da9052_gpio_port_odd(offset))
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ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
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DA9052_GPIO_0_1_REG,
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DA9052_GPIO_MASK_UPPER_NIBBLE,
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(register_value <<
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DA9052_GPIO_NIBBLE_SHIFT));
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else
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ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
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DA9052_GPIO_0_1_REG,
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DA9052_GPIO_MASK_LOWER_NIBBLE,
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register_value);
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return ret;
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}
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static int da9052_gpio_direction_output(struct gpio_chip *gc,
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unsigned offset, int value)
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{
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struct da9052_gpio *gpio = to_da9052_gpio(gc);
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unsigned char register_value;
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int ret;
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/* Format: Function - 2 bits Type - 1 bit Mode - 1 bit */
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register_value = DA9052_OUTPUT_PUSHPULL | DA9052_SUPPLY_VDD_IO1 << 2 |
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value << 3;
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if (da9052_gpio_port_odd(offset))
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ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
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DA9052_GPIO_0_1_REG,
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DA9052_GPIO_MASK_UPPER_NIBBLE,
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(register_value <<
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DA9052_GPIO_NIBBLE_SHIFT));
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else
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ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
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DA9052_GPIO_0_1_REG,
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DA9052_GPIO_MASK_LOWER_NIBBLE,
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register_value);
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return ret;
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}
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static int da9052_gpio_to_irq(struct gpio_chip *gc, u32 offset)
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{
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struct da9052_gpio *gpio = to_da9052_gpio(gc);
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struct da9052 *da9052 = gpio->da9052;
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return da9052->irq_base + DA9052_IRQ_GPI0 + offset;
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}
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static struct gpio_chip reference_gp __devinitdata = {
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.label = "da9052-gpio",
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.owner = THIS_MODULE,
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.get = da9052_gpio_get,
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.set = da9052_gpio_set,
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.direction_input = da9052_gpio_direction_input,
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.direction_output = da9052_gpio_direction_output,
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.to_irq = da9052_gpio_to_irq,
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.can_sleep = 1;
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.ngpio = 16;
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.base = -1;
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};
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static int __devinit da9052_gpio_probe(struct platform_device *pdev)
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{
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struct da9052_gpio *gpio;
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struct da9052_pdata *pdata;
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int ret;
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gpio = kzalloc(sizeof(*gpio), GFP_KERNEL);
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if (gpio == NULL)
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return -ENOMEM;
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gpio->da9052 = dev_get_drvdata(pdev->dev.parent);
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pdata = gpio->da9052->dev->platform_data;
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gpio->gp = reference_gp;
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if (pdata && pdata->gpio_base)
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gpio->gp.base = pdata->gpio_base;
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ret = gpiochip_add(&gpio->gp);
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if (ret < 0) {
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dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
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goto err_mem;
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}
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platform_set_drvdata(pdev, gpio);
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return 0;
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err_mem:
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kfree(gpio);
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return ret;
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}
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static int __devexit da9052_gpio_remove(struct platform_device *pdev)
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{
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struct da9052_gpio *gpio = platform_get_drvdata(pdev);
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int ret;
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ret = gpiochip_remove(&gpio->gp);
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if (ret == 0)
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kfree(gpio);
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return ret;
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}
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static struct platform_driver da9052_gpio_driver = {
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.probe = da9052_gpio_probe,
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.remove = __devexit_p(da9052_gpio_remove),
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.driver = {
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.name = "da9052-gpio",
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.owner = THIS_MODULE,
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},
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};
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static int __init da9052_gpio_init(void)
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{
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return platform_driver_register(&da9052_gpio_driver);
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}
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module_init(da9052_gpio_init);
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static void __exit da9052_gpio_exit(void)
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{
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return platform_driver_unregister(&da9052_gpio_driver);
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}
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module_exit(da9052_gpio_exit);
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MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
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MODULE_DESCRIPTION("DA9052 GPIO Device Driver");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:da9052-gpio");
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