243 lines
6.6 KiB
C
243 lines
6.6 KiB
C
/*
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* TI Palma series PMIC's GPIO driver.
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*
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* Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved.
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*
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* Author: Laxman Dewangan <ldewangan@nvidia.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 and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <linux/gpio.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/mfd/palmas.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/platform_device.h>
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struct palmas_gpio {
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struct gpio_chip gpio_chip;
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struct palmas *palmas;
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};
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struct palmas_device_data {
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int ngpio;
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};
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static inline struct palmas_gpio *to_palmas_gpio(struct gpio_chip *chip)
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{
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return container_of(chip, struct palmas_gpio, gpio_chip);
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}
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static int palmas_gpio_get(struct gpio_chip *gc, unsigned offset)
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{
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struct palmas_gpio *pg = to_palmas_gpio(gc);
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struct palmas *palmas = pg->palmas;
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unsigned int val;
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int ret;
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unsigned int reg;
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int gpio16 = (offset/8);
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offset %= 8;
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reg = (gpio16) ? PALMAS_GPIO_DATA_DIR2 : PALMAS_GPIO_DATA_DIR;
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ret = palmas_read(palmas, PALMAS_GPIO_BASE, reg, &val);
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if (ret < 0) {
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dev_err(gc->parent, "Reg 0x%02x read failed, %d\n", reg, ret);
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return ret;
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}
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if (val & BIT(offset))
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reg = (gpio16) ? PALMAS_GPIO_DATA_OUT2 : PALMAS_GPIO_DATA_OUT;
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else
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reg = (gpio16) ? PALMAS_GPIO_DATA_IN2 : PALMAS_GPIO_DATA_IN;
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ret = palmas_read(palmas, PALMAS_GPIO_BASE, reg, &val);
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if (ret < 0) {
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dev_err(gc->parent, "Reg 0x%02x read failed, %d\n", reg, ret);
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return ret;
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}
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return !!(val & BIT(offset));
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}
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static void palmas_gpio_set(struct gpio_chip *gc, unsigned offset,
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int value)
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{
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struct palmas_gpio *pg = to_palmas_gpio(gc);
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struct palmas *palmas = pg->palmas;
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int ret;
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unsigned int reg;
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int gpio16 = (offset/8);
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offset %= 8;
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if (gpio16)
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reg = (value) ?
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PALMAS_GPIO_SET_DATA_OUT2 : PALMAS_GPIO_CLEAR_DATA_OUT2;
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else
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reg = (value) ?
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PALMAS_GPIO_SET_DATA_OUT : PALMAS_GPIO_CLEAR_DATA_OUT;
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ret = palmas_write(palmas, PALMAS_GPIO_BASE, reg, BIT(offset));
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if (ret < 0)
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dev_err(gc->parent, "Reg 0x%02x write failed, %d\n", reg, ret);
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}
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static int palmas_gpio_output(struct gpio_chip *gc, unsigned offset,
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int value)
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{
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struct palmas_gpio *pg = to_palmas_gpio(gc);
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struct palmas *palmas = pg->palmas;
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int ret;
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unsigned int reg;
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int gpio16 = (offset/8);
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offset %= 8;
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reg = (gpio16) ? PALMAS_GPIO_DATA_DIR2 : PALMAS_GPIO_DATA_DIR;
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/* Set the initial value */
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palmas_gpio_set(gc, offset, value);
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ret = palmas_update_bits(palmas, PALMAS_GPIO_BASE, reg,
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BIT(offset), BIT(offset));
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if (ret < 0)
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dev_err(gc->parent, "Reg 0x%02x update failed, %d\n", reg,
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ret);
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return ret;
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}
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static int palmas_gpio_input(struct gpio_chip *gc, unsigned offset)
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{
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struct palmas_gpio *pg = to_palmas_gpio(gc);
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struct palmas *palmas = pg->palmas;
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int ret;
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unsigned int reg;
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int gpio16 = (offset/8);
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offset %= 8;
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reg = (gpio16) ? PALMAS_GPIO_DATA_DIR2 : PALMAS_GPIO_DATA_DIR;
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ret = palmas_update_bits(palmas, PALMAS_GPIO_BASE, reg, BIT(offset), 0);
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if (ret < 0)
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dev_err(gc->parent, "Reg 0x%02x update failed, %d\n", reg,
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ret);
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return ret;
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}
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static int palmas_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
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{
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struct palmas_gpio *pg = to_palmas_gpio(gc);
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struct palmas *palmas = pg->palmas;
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return palmas_irq_get_virq(palmas, PALMAS_GPIO_0_IRQ + offset);
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}
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static const struct palmas_device_data palmas_dev_data = {
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.ngpio = 8,
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};
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static const struct palmas_device_data tps80036_dev_data = {
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.ngpio = 16,
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};
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static const struct of_device_id of_palmas_gpio_match[] = {
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{ .compatible = "ti,palmas-gpio", .data = &palmas_dev_data,},
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{ .compatible = "ti,tps65913-gpio", .data = &palmas_dev_data,},
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{ .compatible = "ti,tps65914-gpio", .data = &palmas_dev_data,},
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{ .compatible = "ti,tps80036-gpio", .data = &tps80036_dev_data,},
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{ },
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};
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MODULE_DEVICE_TABLE(of, of_palmas_gpio_match);
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static int palmas_gpio_probe(struct platform_device *pdev)
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{
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struct palmas *palmas = dev_get_drvdata(pdev->dev.parent);
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struct palmas_platform_data *palmas_pdata;
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struct palmas_gpio *palmas_gpio;
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int ret;
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const struct of_device_id *match;
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const struct palmas_device_data *dev_data;
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match = of_match_device(of_palmas_gpio_match, &pdev->dev);
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dev_data = match->data;
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if (!dev_data)
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dev_data = &palmas_dev_data;
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palmas_gpio = devm_kzalloc(&pdev->dev,
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sizeof(*palmas_gpio), GFP_KERNEL);
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if (!palmas_gpio)
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return -ENOMEM;
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palmas_gpio->palmas = palmas;
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palmas_gpio->gpio_chip.owner = THIS_MODULE;
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palmas_gpio->gpio_chip.label = dev_name(&pdev->dev);
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palmas_gpio->gpio_chip.ngpio = dev_data->ngpio;
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palmas_gpio->gpio_chip.can_sleep = true;
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palmas_gpio->gpio_chip.direction_input = palmas_gpio_input;
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palmas_gpio->gpio_chip.direction_output = palmas_gpio_output;
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palmas_gpio->gpio_chip.to_irq = palmas_gpio_to_irq;
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palmas_gpio->gpio_chip.set = palmas_gpio_set;
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palmas_gpio->gpio_chip.get = palmas_gpio_get;
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palmas_gpio->gpio_chip.parent = &pdev->dev;
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#ifdef CONFIG_OF_GPIO
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palmas_gpio->gpio_chip.of_node = pdev->dev.of_node;
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#endif
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palmas_pdata = dev_get_platdata(palmas->dev);
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if (palmas_pdata && palmas_pdata->gpio_base)
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palmas_gpio->gpio_chip.base = palmas_pdata->gpio_base;
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else
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palmas_gpio->gpio_chip.base = -1;
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ret = gpiochip_add(&palmas_gpio->gpio_chip);
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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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return ret;
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}
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platform_set_drvdata(pdev, palmas_gpio);
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return ret;
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}
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static int palmas_gpio_remove(struct platform_device *pdev)
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{
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struct palmas_gpio *palmas_gpio = platform_get_drvdata(pdev);
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gpiochip_remove(&palmas_gpio->gpio_chip);
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return 0;
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}
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static struct platform_driver palmas_gpio_driver = {
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.driver.name = "palmas-gpio",
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.driver.owner = THIS_MODULE,
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.driver.of_match_table = of_palmas_gpio_match,
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.probe = palmas_gpio_probe,
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.remove = palmas_gpio_remove,
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};
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static int __init palmas_gpio_init(void)
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{
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return platform_driver_register(&palmas_gpio_driver);
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}
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subsys_initcall(palmas_gpio_init);
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static void __exit palmas_gpio_exit(void)
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{
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platform_driver_unregister(&palmas_gpio_driver);
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}
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module_exit(palmas_gpio_exit);
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MODULE_ALIAS("platform:palmas-gpio");
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MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
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MODULE_DESCRIPTION("GPIO driver for TI Palmas series PMICs");
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MODULE_LICENSE("GPL v2");
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