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