135 lines
3.4 KiB
C
135 lines
3.4 KiB
C
/*
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* Access to GPOs on TWL6040 chip
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*
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* Copyright (C) 2012 Texas Instruments, Inc.
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*
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* Authors:
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* Sergio Aguirre <saaguirre@ti.com>
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* Peter Ujfalusi <peter.ujfalusi@ti.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for 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, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/kthread.h>
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#include <linux/irq.h>
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#include <linux/gpio.h>
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#include <linux/platform_device.h>
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#include <linux/of.h>
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#include <linux/mfd/twl6040.h>
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static struct gpio_chip twl6040gpo_chip;
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static int twl6040gpo_get(struct gpio_chip *chip, unsigned offset)
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{
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struct twl6040 *twl6040 = dev_get_drvdata(chip->dev->parent);
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int ret = 0;
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ret = twl6040_reg_read(twl6040, TWL6040_REG_GPOCTL);
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if (ret < 0)
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return ret;
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return (ret >> offset) & 1;
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}
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static int twl6040gpo_direction_out(struct gpio_chip *chip, unsigned offset,
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int value)
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{
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/* This only drives GPOs, and can't change direction */
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return 0;
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}
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static void twl6040gpo_set(struct gpio_chip *chip, unsigned offset, int value)
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{
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struct twl6040 *twl6040 = dev_get_drvdata(chip->dev->parent);
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int ret;
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u8 gpoctl;
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ret = twl6040_reg_read(twl6040, TWL6040_REG_GPOCTL);
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if (ret < 0)
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return;
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if (value)
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gpoctl = ret | (1 << offset);
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else
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gpoctl = ret & ~(1 << offset);
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twl6040_reg_write(twl6040, TWL6040_REG_GPOCTL, gpoctl);
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}
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static struct gpio_chip twl6040gpo_chip = {
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.label = "twl6040",
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.owner = THIS_MODULE,
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.get = twl6040gpo_get,
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.direction_output = twl6040gpo_direction_out,
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.set = twl6040gpo_set,
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.can_sleep = true,
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};
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/*----------------------------------------------------------------------*/
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static int gpo_twl6040_probe(struct platform_device *pdev)
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{
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struct device *twl6040_core_dev = pdev->dev.parent;
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struct twl6040 *twl6040 = dev_get_drvdata(twl6040_core_dev);
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int ret;
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twl6040gpo_chip.base = -1;
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if (twl6040_get_revid(twl6040) < TWL6041_REV_ES2_0)
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twl6040gpo_chip.ngpio = 3; /* twl6040 have 3 GPO */
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else
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twl6040gpo_chip.ngpio = 1; /* twl6041 have 1 GPO */
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twl6040gpo_chip.dev = &pdev->dev;
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#ifdef CONFIG_OF_GPIO
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twl6040gpo_chip.of_node = twl6040_core_dev->of_node;
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#endif
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ret = gpiochip_add(&twl6040gpo_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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twl6040gpo_chip.ngpio = 0;
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}
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return ret;
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}
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static int gpo_twl6040_remove(struct platform_device *pdev)
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{
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gpiochip_remove(&twl6040gpo_chip);
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return 0;
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}
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/* Note: this hardware lives inside an I2C-based multi-function device. */
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MODULE_ALIAS("platform:twl6040-gpo");
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static struct platform_driver gpo_twl6040_driver = {
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.driver = {
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.name = "twl6040-gpo",
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.owner = THIS_MODULE,
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},
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.probe = gpo_twl6040_probe,
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.remove = gpo_twl6040_remove,
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};
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module_platform_driver(gpo_twl6040_driver);
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MODULE_AUTHOR("Texas Instruments, Inc.");
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MODULE_DESCRIPTION("GPO interface for TWL6040");
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MODULE_LICENSE("GPL");
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