330 lines
8.1 KiB
C
330 lines
8.1 KiB
C
/*
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* Texas Instruments' Palmas Power Button Input Driver
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*
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* Copyright (C) 2012-2014 Texas Instruments Incorporated - http://www.ti.com/
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* Girish S Ghongdemath
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* Nishanth Menon
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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/palmas.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/slab.h>
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#define PALMAS_LPK_TIME_MASK 0x0c
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#define PALMAS_PWRON_DEBOUNCE_MASK 0x03
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#define PALMAS_PWR_KEY_Q_TIME_MS 20
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/**
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* struct palmas_pwron - Palmas power on data
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* @palmas: pointer to palmas device
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* @input_dev: pointer to input device
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* @input_work: work for detecting release of key
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* @irq: irq that we are hooked on to
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*/
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struct palmas_pwron {
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struct palmas *palmas;
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struct input_dev *input_dev;
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struct delayed_work input_work;
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int irq;
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};
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/**
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* struct palmas_pwron_config - configuration of palmas power on
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* @long_press_time_val: value for long press h/w shutdown event
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* @pwron_debounce_val: value for debounce of power button
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*/
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struct palmas_pwron_config {
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u8 long_press_time_val;
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u8 pwron_debounce_val;
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};
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/**
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* palmas_power_button_work() - Detects the button release event
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* @work: work item to detect button release
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*/
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static void palmas_power_button_work(struct work_struct *work)
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{
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struct palmas_pwron *pwron = container_of(work,
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struct palmas_pwron,
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input_work.work);
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struct input_dev *input_dev = pwron->input_dev;
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unsigned int reg;
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int error;
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error = palmas_read(pwron->palmas, PALMAS_INTERRUPT_BASE,
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PALMAS_INT1_LINE_STATE, ®);
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if (error) {
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dev_err(input_dev->dev.parent,
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"Cannot read palmas PWRON status: %d\n", error);
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} else if (reg & BIT(1)) {
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/* The button is released, report event. */
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input_report_key(input_dev, KEY_POWER, 0);
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input_sync(input_dev);
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} else {
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/* The button is still depressed, keep checking. */
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schedule_delayed_work(&pwron->input_work,
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msecs_to_jiffies(PALMAS_PWR_KEY_Q_TIME_MS));
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}
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}
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/**
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* pwron_irq() - button press isr
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* @irq: irq
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* @palmas_pwron: pwron struct
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*
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* Return: IRQ_HANDLED
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*/
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static irqreturn_t pwron_irq(int irq, void *palmas_pwron)
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{
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struct palmas_pwron *pwron = palmas_pwron;
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struct input_dev *input_dev = pwron->input_dev;
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input_report_key(input_dev, KEY_POWER, 1);
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pm_wakeup_event(input_dev->dev.parent, 0);
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input_sync(input_dev);
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mod_delayed_work(system_wq, &pwron->input_work,
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msecs_to_jiffies(PALMAS_PWR_KEY_Q_TIME_MS));
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return IRQ_HANDLED;
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}
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/**
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* palmas_pwron_params_ofinit() - device tree parameter parser
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* @dev: palmas button device
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* @config: configuration params that this fills up
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*/
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static void palmas_pwron_params_ofinit(struct device *dev,
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struct palmas_pwron_config *config)
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{
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struct device_node *np;
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u32 val;
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int i, error;
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u8 lpk_times[] = { 6, 8, 10, 12 };
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int pwr_on_deb_ms[] = { 15, 100, 500, 1000 };
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memset(config, 0, sizeof(*config));
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/* Default config parameters */
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config->long_press_time_val = ARRAY_SIZE(lpk_times) - 1;
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np = dev->of_node;
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if (!np)
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return;
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error = of_property_read_u32(np, "ti,palmas-long-press-seconds", &val);
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if (!error) {
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for (i = 0; i < ARRAY_SIZE(lpk_times); i++) {
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if (val <= lpk_times[i]) {
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config->long_press_time_val = i;
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break;
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}
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}
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}
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error = of_property_read_u32(np,
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"ti,palmas-pwron-debounce-milli-seconds",
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&val);
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if (!error) {
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for (i = 0; i < ARRAY_SIZE(pwr_on_deb_ms); i++) {
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if (val <= pwr_on_deb_ms[i]) {
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config->pwron_debounce_val = i;
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break;
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}
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}
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}
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dev_info(dev, "h/w controlled shutdown duration=%d seconds\n",
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lpk_times[config->long_press_time_val]);
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}
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/**
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* palmas_pwron_probe() - probe
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* @pdev: platform device for the button
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*
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* Return: 0 for successful probe else appropriate error
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*/
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static int palmas_pwron_probe(struct platform_device *pdev)
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{
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struct palmas *palmas = dev_get_drvdata(pdev->dev.parent);
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struct device *dev = &pdev->dev;
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struct input_dev *input_dev;
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struct palmas_pwron *pwron;
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struct palmas_pwron_config config;
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int val;
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int error;
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palmas_pwron_params_ofinit(dev, &config);
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pwron = kzalloc(sizeof(*pwron), GFP_KERNEL);
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if (!pwron)
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return -ENOMEM;
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input_dev = input_allocate_device();
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if (!input_dev) {
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dev_err(dev, "Can't allocate power button\n");
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error = -ENOMEM;
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goto err_free_mem;
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}
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input_dev->name = "palmas_pwron";
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input_dev->phys = "palmas_pwron/input0";
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input_dev->dev.parent = dev;
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input_set_capability(input_dev, EV_KEY, KEY_POWER);
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/*
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* Setup default hardware shutdown option (long key press)
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* and debounce.
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*/
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val = config.long_press_time_val << __ffs(PALMAS_LPK_TIME_MASK);
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val |= config.pwron_debounce_val << __ffs(PALMAS_PWRON_DEBOUNCE_MASK);
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error = palmas_update_bits(palmas, PALMAS_PMU_CONTROL_BASE,
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PALMAS_LONG_PRESS_KEY,
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PALMAS_LPK_TIME_MASK |
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PALMAS_PWRON_DEBOUNCE_MASK,
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val);
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if (error) {
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dev_err(dev, "LONG_PRESS_KEY_UPDATE failed: %d\n", error);
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goto err_free_input;
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}
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pwron->palmas = palmas;
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pwron->input_dev = input_dev;
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INIT_DELAYED_WORK(&pwron->input_work, palmas_power_button_work);
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pwron->irq = platform_get_irq(pdev, 0);
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error = request_threaded_irq(pwron->irq, NULL, pwron_irq,
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IRQF_TRIGGER_HIGH |
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IRQF_TRIGGER_LOW |
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IRQF_ONESHOT,
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dev_name(dev), pwron);
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if (error) {
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dev_err(dev, "Can't get IRQ for pwron: %d\n", error);
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goto err_free_input;
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}
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error = input_register_device(input_dev);
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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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goto err_free_irq;
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}
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platform_set_drvdata(pdev, pwron);
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device_init_wakeup(dev, true);
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return 0;
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err_free_irq:
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cancel_delayed_work_sync(&pwron->input_work);
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free_irq(pwron->irq, pwron);
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err_free_input:
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input_free_device(input_dev);
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err_free_mem:
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kfree(pwron);
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return error;
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}
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/**
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* palmas_pwron_remove() - Cleanup on removal
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* @pdev: platform device for the button
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*
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* Return: 0
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*/
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static int palmas_pwron_remove(struct platform_device *pdev)
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{
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struct palmas_pwron *pwron = platform_get_drvdata(pdev);
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free_irq(pwron->irq, pwron);
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cancel_delayed_work_sync(&pwron->input_work);
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input_unregister_device(pwron->input_dev);
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kfree(pwron);
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return 0;
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}
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/**
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* palmas_pwron_suspend() - suspend handler
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* @dev: power button device
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*
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* Cancel all pending work items for the power button, setup irq for wakeup
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*
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* Return: 0
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*/
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static int __maybe_unused palmas_pwron_suspend(struct device *dev)
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{
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struct platform_device *pdev = to_platform_device(dev);
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struct palmas_pwron *pwron = platform_get_drvdata(pdev);
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cancel_delayed_work_sync(&pwron->input_work);
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if (device_may_wakeup(dev))
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enable_irq_wake(pwron->irq);
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return 0;
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}
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/**
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* palmas_pwron_resume() - resume handler
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* @dev: power button device
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*
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* Just disable the wakeup capability of irq here.
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*
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* Return: 0
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*/
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static int __maybe_unused palmas_pwron_resume(struct device *dev)
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{
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struct platform_device *pdev = to_platform_device(dev);
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struct palmas_pwron *pwron = platform_get_drvdata(pdev);
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if (device_may_wakeup(dev))
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disable_irq_wake(pwron->irq);
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return 0;
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}
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static SIMPLE_DEV_PM_OPS(palmas_pwron_pm,
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palmas_pwron_suspend, palmas_pwron_resume);
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#ifdef CONFIG_OF
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static const struct of_device_id of_palmas_pwr_match[] = {
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{ .compatible = "ti,palmas-pwrbutton" },
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{ },
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};
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MODULE_DEVICE_TABLE(of, of_palmas_pwr_match);
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#endif
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static struct platform_driver palmas_pwron_driver = {
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.probe = palmas_pwron_probe,
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.remove = palmas_pwron_remove,
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.driver = {
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.name = "palmas_pwrbutton",
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.of_match_table = of_match_ptr(of_palmas_pwr_match),
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.pm = &palmas_pwron_pm,
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},
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};
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module_platform_driver(palmas_pwron_driver);
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MODULE_ALIAS("platform:palmas-pwrbutton");
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MODULE_DESCRIPTION("Palmas Power Button");
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MODULE_LICENSE("GPL v2");
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MODULE_AUTHOR("Texas Instruments Inc.");
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