| /* |
| * Access to GPOs on TWL6040 chip |
| * |
| * Copyright (C) 2012 Texas Instruments, Inc. |
| * |
| * Authors: |
| * Sergio Aguirre <saaguirre@ti.com> |
| * Peter Ujfalusi <peter.ujfalusi@ti.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. |
| * |
| * This program is distributed in the hope that 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, write to the Free Software |
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/init.h> |
| #include <linux/kthread.h> |
| #include <linux/irq.h> |
| #include <linux/gpio.h> |
| #include <linux/platform_device.h> |
| #include <linux/of.h> |
| |
| #include <linux/mfd/twl6040.h> |
| |
| static struct gpio_chip twl6040gpo_chip; |
| |
| static int twl6040gpo_get(struct gpio_chip *chip, unsigned offset) |
| { |
| struct twl6040 *twl6040 = dev_get_drvdata(chip->dev->parent); |
| int ret = 0; |
| |
| ret = twl6040_reg_read(twl6040, TWL6040_REG_GPOCTL); |
| if (ret < 0) |
| return ret; |
| |
| return (ret >> offset) & 1; |
| } |
| |
| static int twl6040gpo_direction_out(struct gpio_chip *chip, unsigned offset, |
| int value) |
| { |
| /* This only drives GPOs, and can't change direction */ |
| return 0; |
| } |
| |
| static void twl6040gpo_set(struct gpio_chip *chip, unsigned offset, int value) |
| { |
| struct twl6040 *twl6040 = dev_get_drvdata(chip->dev->parent); |
| int ret; |
| u8 gpoctl; |
| |
| ret = twl6040_reg_read(twl6040, TWL6040_REG_GPOCTL); |
| if (ret < 0) |
| return; |
| |
| if (value) |
| gpoctl = ret | (1 << offset); |
| else |
| gpoctl = ret & ~(1 << offset); |
| |
| twl6040_reg_write(twl6040, TWL6040_REG_GPOCTL, gpoctl); |
| } |
| |
| static struct gpio_chip twl6040gpo_chip = { |
| .label = "twl6040", |
| .owner = THIS_MODULE, |
| .get = twl6040gpo_get, |
| .direction_output = twl6040gpo_direction_out, |
| .set = twl6040gpo_set, |
| .can_sleep = true, |
| }; |
| |
| /*----------------------------------------------------------------------*/ |
| |
| static int gpo_twl6040_probe(struct platform_device *pdev) |
| { |
| struct device *twl6040_core_dev = pdev->dev.parent; |
| struct twl6040 *twl6040 = dev_get_drvdata(twl6040_core_dev); |
| int ret; |
| |
| twl6040gpo_chip.base = -1; |
| |
| if (twl6040_get_revid(twl6040) < TWL6041_REV_ES2_0) |
| twl6040gpo_chip.ngpio = 3; /* twl6040 have 3 GPO */ |
| else |
| twl6040gpo_chip.ngpio = 1; /* twl6041 have 1 GPO */ |
| |
| twl6040gpo_chip.dev = &pdev->dev; |
| #ifdef CONFIG_OF_GPIO |
| twl6040gpo_chip.of_node = twl6040_core_dev->of_node; |
| #endif |
| |
| ret = gpiochip_add(&twl6040gpo_chip); |
| if (ret < 0) { |
| dev_err(&pdev->dev, "could not register gpiochip, %d\n", ret); |
| twl6040gpo_chip.ngpio = 0; |
| } |
| |
| return ret; |
| } |
| |
| static int gpo_twl6040_remove(struct platform_device *pdev) |
| { |
| gpiochip_remove(&twl6040gpo_chip); |
| return 0; |
| } |
| |
| /* Note: this hardware lives inside an I2C-based multi-function device. */ |
| MODULE_ALIAS("platform:twl6040-gpo"); |
| |
| static struct platform_driver gpo_twl6040_driver = { |
| .driver = { |
| .name = "twl6040-gpo", |
| }, |
| .probe = gpo_twl6040_probe, |
| .remove = gpo_twl6040_remove, |
| }; |
| |
| module_platform_driver(gpo_twl6040_driver); |
| |
| MODULE_AUTHOR("Texas Instruments, Inc."); |
| MODULE_DESCRIPTION("GPO interface for TWL6040"); |
| MODULE_LICENSE("GPL"); |