165 lines
4.0 KiB
C
165 lines
4.0 KiB
C
/*
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* Texas Instruments' TPS65217 and TPS65218 Power Button Input Driver
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*
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* Copyright (C) 2014 Texas Instruments Incorporated - http://www.ti.com/
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* Author: Felipe Balbi <balbi@ti.com>
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* Author: Marcin Niestroj <m.niestroj@grinn-global.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 version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed "as is" WITHOUT ANY WARRANTY of any
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* kind, whether express or implied; without even the implied warranty
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* of 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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#include <linux/init.h>
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#include <linux/input.h>
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#include <linux/interrupt.h>
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#include <linux/kernel.h>
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#include <linux/mfd/tps65217.h>
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#include <linux/mfd/tps65218.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <linux/regmap.h>
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#include <linux/slab.h>
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struct tps6521x_data {
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unsigned int reg_status;
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unsigned int pb_mask;
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const char *name;
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};
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static const struct tps6521x_data tps65217_data = {
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.reg_status = TPS65217_REG_STATUS,
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.pb_mask = TPS65217_STATUS_PB,
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.name = "tps65217_pwrbutton",
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};
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static const struct tps6521x_data tps65218_data = {
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.reg_status = TPS65218_REG_STATUS,
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.pb_mask = TPS65218_STATUS_PB_STATE,
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.name = "tps65218_pwrbutton",
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};
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struct tps6521x_pwrbutton {
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struct device *dev;
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struct regmap *regmap;
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struct input_dev *idev;
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const struct tps6521x_data *data;
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char phys[32];
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};
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static const struct of_device_id of_tps6521x_pb_match[] = {
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{ .compatible = "ti,tps65217-pwrbutton", .data = &tps65217_data },
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{ .compatible = "ti,tps65218-pwrbutton", .data = &tps65218_data },
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{ },
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};
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MODULE_DEVICE_TABLE(of, of_tps6521x_pb_match);
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static irqreturn_t tps6521x_pb_irq(int irq, void *_pwr)
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{
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struct tps6521x_pwrbutton *pwr = _pwr;
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const struct tps6521x_data *tps_data = pwr->data;
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unsigned int reg;
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int error;
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error = regmap_read(pwr->regmap, tps_data->reg_status, ®);
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if (error) {
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dev_err(pwr->dev, "can't read register: %d\n", error);
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goto out;
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}
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if (reg & tps_data->pb_mask) {
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input_report_key(pwr->idev, KEY_POWER, 1);
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pm_wakeup_event(pwr->dev, 0);
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} else {
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input_report_key(pwr->idev, KEY_POWER, 0);
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}
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input_sync(pwr->idev);
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out:
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return IRQ_HANDLED;
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}
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static int tps6521x_pb_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct tps6521x_pwrbutton *pwr;
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struct input_dev *idev;
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const struct of_device_id *match;
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int error;
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int irq;
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match = of_match_node(of_tps6521x_pb_match, pdev->dev.of_node);
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if (!match)
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return -ENXIO;
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pwr = devm_kzalloc(dev, sizeof(*pwr), GFP_KERNEL);
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if (!pwr)
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return -ENOMEM;
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pwr->data = match->data;
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idev = devm_input_allocate_device(dev);
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if (!idev)
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return -ENOMEM;
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idev->name = pwr->data->name;
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snprintf(pwr->phys, sizeof(pwr->phys), "%s/input0",
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pwr->data->name);
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idev->phys = pwr->phys;
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idev->dev.parent = dev;
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idev->id.bustype = BUS_I2C;
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input_set_capability(idev, EV_KEY, KEY_POWER);
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pwr->regmap = dev_get_regmap(pdev->dev.parent, NULL);
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pwr->dev = dev;
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pwr->idev = idev;
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platform_set_drvdata(pdev, pwr);
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device_init_wakeup(dev, true);
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irq = platform_get_irq(pdev, 0);
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if (irq < 0) {
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dev_err(dev, "No IRQ resource!\n");
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return -EINVAL;
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}
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error = devm_request_threaded_irq(dev, irq, NULL, tps6521x_pb_irq,
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IRQF_TRIGGER_RISING |
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IRQF_TRIGGER_FALLING |
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IRQF_ONESHOT,
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pwr->data->name, pwr);
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if (error) {
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dev_err(dev, "failed to request IRQ #%d: %d\n",
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irq, error);
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return error;
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}
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error= input_register_device(idev);
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if (error) {
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dev_err(dev, "Can't register power button: %d\n", error);
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return error;
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}
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return 0;
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}
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static struct platform_driver tps6521x_pb_driver = {
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.probe = tps6521x_pb_probe,
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.driver = {
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.name = "tps6521x_pwrbutton",
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.of_match_table = of_tps6521x_pb_match,
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},
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};
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module_platform_driver(tps6521x_pb_driver);
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MODULE_DESCRIPTION("TPS6521X Power Button");
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MODULE_LICENSE("GPL v2");
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MODULE_AUTHOR("Felipe Balbi <balbi@ti.com>");
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