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134 lines
3.4 KiB
134 lines
3.4 KiB
/* |
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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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