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- /*
- * 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->parent->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->parent->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.parent = &pdev->dev;
- #ifdef CONFIG_OF_GPIO
- twl6040gpo_chip.of_node = twl6040_core_dev->of_node;
- #endif
- ret = devm_gpiochip_add_data(&pdev->dev, &twl6040gpo_chip, NULL);
- if (ret < 0) {
- dev_err(&pdev->dev, "could not register gpiochip, %d\n", ret);
- twl6040gpo_chip.ngpio = 0;
- }
- return ret;
- }
- /* 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,
- };
- module_platform_driver(gpo_twl6040_driver);
- MODULE_AUTHOR("Texas Instruments, Inc.");
- MODULE_DESCRIPTION("GPO interface for TWL6040");
- MODULE_LICENSE("GPL");
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