forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
329 lines
8.1 KiB
329 lines
8.1 KiB
/* |
|
* Texas Instruments' Palmas Power Button Input Driver |
|
* |
|
* Copyright (C) 2012-2014 Texas Instruments Incorporated - http://www.ti.com/ |
|
* Girish S Ghongdemath |
|
* Nishanth Menon |
|
* |
|
* This program is free software; you can redistribute it and/or modify |
|
* it under the terms of the GNU General Public License version 2 as |
|
* published by the Free Software Foundation. |
|
* |
|
* This program is distributed "as is" WITHOUT ANY WARRANTY of any |
|
* kind, whether express or implied; without even the implied warranty |
|
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
|
* GNU General Public License for more details. |
|
*/ |
|
|
|
#include <linux/init.h> |
|
#include <linux/input.h> |
|
#include <linux/interrupt.h> |
|
#include <linux/kernel.h> |
|
#include <linux/mfd/palmas.h> |
|
#include <linux/module.h> |
|
#include <linux/of.h> |
|
#include <linux/platform_device.h> |
|
#include <linux/slab.h> |
|
|
|
#define PALMAS_LPK_TIME_MASK 0x0c |
|
#define PALMAS_PWRON_DEBOUNCE_MASK 0x03 |
|
#define PALMAS_PWR_KEY_Q_TIME_MS 20 |
|
|
|
/** |
|
* struct palmas_pwron - Palmas power on data |
|
* @palmas: pointer to palmas device |
|
* @input_dev: pointer to input device |
|
* @input_work: work for detecting release of key |
|
* @irq: irq that we are hooked on to |
|
*/ |
|
struct palmas_pwron { |
|
struct palmas *palmas; |
|
struct input_dev *input_dev; |
|
struct delayed_work input_work; |
|
int irq; |
|
}; |
|
|
|
/** |
|
* struct palmas_pwron_config - configuration of palmas power on |
|
* @long_press_time_val: value for long press h/w shutdown event |
|
* @pwron_debounce_val: value for debounce of power button |
|
*/ |
|
struct palmas_pwron_config { |
|
u8 long_press_time_val; |
|
u8 pwron_debounce_val; |
|
}; |
|
|
|
/** |
|
* palmas_power_button_work() - Detects the button release event |
|
* @work: work item to detect button release |
|
*/ |
|
static void palmas_power_button_work(struct work_struct *work) |
|
{ |
|
struct palmas_pwron *pwron = container_of(work, |
|
struct palmas_pwron, |
|
input_work.work); |
|
struct input_dev *input_dev = pwron->input_dev; |
|
unsigned int reg; |
|
int error; |
|
|
|
error = palmas_read(pwron->palmas, PALMAS_INTERRUPT_BASE, |
|
PALMAS_INT1_LINE_STATE, ®); |
|
if (error) { |
|
dev_err(input_dev->dev.parent, |
|
"Cannot read palmas PWRON status: %d\n", error); |
|
} else if (reg & BIT(1)) { |
|
/* The button is released, report event. */ |
|
input_report_key(input_dev, KEY_POWER, 0); |
|
input_sync(input_dev); |
|
} else { |
|
/* The button is still depressed, keep checking. */ |
|
schedule_delayed_work(&pwron->input_work, |
|
msecs_to_jiffies(PALMAS_PWR_KEY_Q_TIME_MS)); |
|
} |
|
} |
|
|
|
/** |
|
* pwron_irq() - button press isr |
|
* @irq: irq |
|
* @palmas_pwron: pwron struct |
|
* |
|
* Return: IRQ_HANDLED |
|
*/ |
|
static irqreturn_t pwron_irq(int irq, void *palmas_pwron) |
|
{ |
|
struct palmas_pwron *pwron = palmas_pwron; |
|
struct input_dev *input_dev = pwron->input_dev; |
|
|
|
input_report_key(input_dev, KEY_POWER, 1); |
|
pm_wakeup_event(input_dev->dev.parent, 0); |
|
input_sync(input_dev); |
|
|
|
mod_delayed_work(system_wq, &pwron->input_work, |
|
msecs_to_jiffies(PALMAS_PWR_KEY_Q_TIME_MS)); |
|
|
|
return IRQ_HANDLED; |
|
} |
|
|
|
/** |
|
* palmas_pwron_params_ofinit() - device tree parameter parser |
|
* @dev: palmas button device |
|
* @config: configuration params that this fills up |
|
*/ |
|
static void palmas_pwron_params_ofinit(struct device *dev, |
|
struct palmas_pwron_config *config) |
|
{ |
|
struct device_node *np; |
|
u32 val; |
|
int i, error; |
|
u8 lpk_times[] = { 6, 8, 10, 12 }; |
|
int pwr_on_deb_ms[] = { 15, 100, 500, 1000 }; |
|
|
|
memset(config, 0, sizeof(*config)); |
|
|
|
/* Default config parameters */ |
|
config->long_press_time_val = ARRAY_SIZE(lpk_times) - 1; |
|
|
|
np = dev->of_node; |
|
if (!np) |
|
return; |
|
|
|
error = of_property_read_u32(np, "ti,palmas-long-press-seconds", &val); |
|
if (!error) { |
|
for (i = 0; i < ARRAY_SIZE(lpk_times); i++) { |
|
if (val <= lpk_times[i]) { |
|
config->long_press_time_val = i; |
|
break; |
|
} |
|
} |
|
} |
|
|
|
error = of_property_read_u32(np, |
|
"ti,palmas-pwron-debounce-milli-seconds", |
|
&val); |
|
if (!error) { |
|
for (i = 0; i < ARRAY_SIZE(pwr_on_deb_ms); i++) { |
|
if (val <= pwr_on_deb_ms[i]) { |
|
config->pwron_debounce_val = i; |
|
break; |
|
} |
|
} |
|
} |
|
|
|
dev_info(dev, "h/w controlled shutdown duration=%d seconds\n", |
|
lpk_times[config->long_press_time_val]); |
|
} |
|
|
|
/** |
|
* palmas_pwron_probe() - probe |
|
* @pdev: platform device for the button |
|
* |
|
* Return: 0 for successful probe else appropriate error |
|
*/ |
|
static int palmas_pwron_probe(struct platform_device *pdev) |
|
{ |
|
struct palmas *palmas = dev_get_drvdata(pdev->dev.parent); |
|
struct device *dev = &pdev->dev; |
|
struct input_dev *input_dev; |
|
struct palmas_pwron *pwron; |
|
struct palmas_pwron_config config; |
|
int val; |
|
int error; |
|
|
|
palmas_pwron_params_ofinit(dev, &config); |
|
|
|
pwron = kzalloc(sizeof(*pwron), GFP_KERNEL); |
|
if (!pwron) |
|
return -ENOMEM; |
|
|
|
input_dev = input_allocate_device(); |
|
if (!input_dev) { |
|
dev_err(dev, "Can't allocate power button\n"); |
|
error = -ENOMEM; |
|
goto err_free_mem; |
|
} |
|
|
|
input_dev->name = "palmas_pwron"; |
|
input_dev->phys = "palmas_pwron/input0"; |
|
input_dev->dev.parent = dev; |
|
|
|
input_set_capability(input_dev, EV_KEY, KEY_POWER); |
|
|
|
/* |
|
* Setup default hardware shutdown option (long key press) |
|
* and debounce. |
|
*/ |
|
val = config.long_press_time_val << __ffs(PALMAS_LPK_TIME_MASK); |
|
val |= config.pwron_debounce_val << __ffs(PALMAS_PWRON_DEBOUNCE_MASK); |
|
error = palmas_update_bits(palmas, PALMAS_PMU_CONTROL_BASE, |
|
PALMAS_LONG_PRESS_KEY, |
|
PALMAS_LPK_TIME_MASK | |
|
PALMAS_PWRON_DEBOUNCE_MASK, |
|
val); |
|
if (error) { |
|
dev_err(dev, "LONG_PRESS_KEY_UPDATE failed: %d\n", error); |
|
goto err_free_input; |
|
} |
|
|
|
pwron->palmas = palmas; |
|
pwron->input_dev = input_dev; |
|
|
|
INIT_DELAYED_WORK(&pwron->input_work, palmas_power_button_work); |
|
|
|
pwron->irq = platform_get_irq(pdev, 0); |
|
error = request_threaded_irq(pwron->irq, NULL, pwron_irq, |
|
IRQF_TRIGGER_HIGH | |
|
IRQF_TRIGGER_LOW | |
|
IRQF_ONESHOT, |
|
dev_name(dev), pwron); |
|
if (error) { |
|
dev_err(dev, "Can't get IRQ for pwron: %d\n", error); |
|
goto err_free_input; |
|
} |
|
|
|
error = input_register_device(input_dev); |
|
if (error) { |
|
dev_err(dev, "Can't register power button: %d\n", error); |
|
goto err_free_irq; |
|
} |
|
|
|
platform_set_drvdata(pdev, pwron); |
|
device_init_wakeup(dev, true); |
|
|
|
return 0; |
|
|
|
err_free_irq: |
|
cancel_delayed_work_sync(&pwron->input_work); |
|
free_irq(pwron->irq, pwron); |
|
err_free_input: |
|
input_free_device(input_dev); |
|
err_free_mem: |
|
kfree(pwron); |
|
return error; |
|
} |
|
|
|
/** |
|
* palmas_pwron_remove() - Cleanup on removal |
|
* @pdev: platform device for the button |
|
* |
|
* Return: 0 |
|
*/ |
|
static int palmas_pwron_remove(struct platform_device *pdev) |
|
{ |
|
struct palmas_pwron *pwron = platform_get_drvdata(pdev); |
|
|
|
free_irq(pwron->irq, pwron); |
|
cancel_delayed_work_sync(&pwron->input_work); |
|
|
|
input_unregister_device(pwron->input_dev); |
|
kfree(pwron); |
|
|
|
return 0; |
|
} |
|
|
|
/** |
|
* palmas_pwron_suspend() - suspend handler |
|
* @dev: power button device |
|
* |
|
* Cancel all pending work items for the power button, setup irq for wakeup |
|
* |
|
* Return: 0 |
|
*/ |
|
static int __maybe_unused palmas_pwron_suspend(struct device *dev) |
|
{ |
|
struct platform_device *pdev = to_platform_device(dev); |
|
struct palmas_pwron *pwron = platform_get_drvdata(pdev); |
|
|
|
cancel_delayed_work_sync(&pwron->input_work); |
|
|
|
if (device_may_wakeup(dev)) |
|
enable_irq_wake(pwron->irq); |
|
|
|
return 0; |
|
} |
|
|
|
/** |
|
* palmas_pwron_resume() - resume handler |
|
* @dev: power button device |
|
* |
|
* Just disable the wakeup capability of irq here. |
|
* |
|
* Return: 0 |
|
*/ |
|
static int __maybe_unused palmas_pwron_resume(struct device *dev) |
|
{ |
|
struct platform_device *pdev = to_platform_device(dev); |
|
struct palmas_pwron *pwron = platform_get_drvdata(pdev); |
|
|
|
if (device_may_wakeup(dev)) |
|
disable_irq_wake(pwron->irq); |
|
|
|
return 0; |
|
} |
|
|
|
static SIMPLE_DEV_PM_OPS(palmas_pwron_pm, |
|
palmas_pwron_suspend, palmas_pwron_resume); |
|
|
|
#ifdef CONFIG_OF |
|
static const struct of_device_id of_palmas_pwr_match[] = { |
|
{ .compatible = "ti,palmas-pwrbutton" }, |
|
{ }, |
|
}; |
|
|
|
MODULE_DEVICE_TABLE(of, of_palmas_pwr_match); |
|
#endif |
|
|
|
static struct platform_driver palmas_pwron_driver = { |
|
.probe = palmas_pwron_probe, |
|
.remove = palmas_pwron_remove, |
|
.driver = { |
|
.name = "palmas_pwrbutton", |
|
.of_match_table = of_match_ptr(of_palmas_pwr_match), |
|
.pm = &palmas_pwron_pm, |
|
}, |
|
}; |
|
module_platform_driver(palmas_pwron_driver); |
|
|
|
MODULE_ALIAS("platform:palmas-pwrbutton"); |
|
MODULE_DESCRIPTION("Palmas Power Button"); |
|
MODULE_LICENSE("GPL v2"); |
|
MODULE_AUTHOR("Texas Instruments Inc.");
|
|
|