[mirror_ubuntu-bionic-kernel.git] / drivers / input / misc / sirfsoc-onkey.c

/*
 * Power key driver for SiRF PrimaII
 *
 * Copyright (c) 2013 Cambridge Silicon Radio Limited, a CSR plc group company.
 *
 * Licensed under GPLv2 or later.
 */

#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/platform_device.h>
#include <linux/input.h>
#include <linux/rtc/sirfsoc_rtciobrg.h>
#include <linux/of.h>

struct sirfsoc_pwrc_drvdata {
	u32			pwrc_base;
	struct input_dev	*input;
};

#define PWRC_ON_KEY_BIT			(1 << 0)

#define PWRC_INT_STATUS			0xc
#define PWRC_INT_MASK			0x10

static irqreturn_t sirfsoc_pwrc_isr(int irq, void *dev_id)
{
	struct sirfsoc_pwrc_drvdata *pwrcdrv = dev_id;
	u32 int_status;

	int_status = sirfsoc_rtc_iobrg_readl(pwrcdrv->pwrc_base +
							PWRC_INT_STATUS);
	sirfsoc_rtc_iobrg_writel(int_status & ~PWRC_ON_KEY_BIT,
				 pwrcdrv->pwrc_base + PWRC_INT_STATUS);

	/*
	 * For a typical Linux system, we report KEY_SUSPEND to trigger apm-power.c
	 * to queue a SUSPEND APM event
	 */
	input_event(pwrcdrv->input, EV_PWR, KEY_SUSPEND, 1);
	input_sync(pwrcdrv->input);

	/*
	 * Todo: report KEY_POWER event for Android platforms, Android PowerManager
	 * will handle the suspend and powerdown/hibernation
	 */

	return IRQ_HANDLED;
}

static void sirfsoc_pwrc_toggle_interrupts(struct sirfsoc_pwrc_drvdata *pwrcdrv,
					   bool enable)
{
	u32 int_mask;

	int_mask = sirfsoc_rtc_iobrg_readl(pwrcdrv->pwrc_base + PWRC_INT_MASK);
	if (enable)
		int_mask |= PWRC_ON_KEY_BIT;
	else
		int_mask &= ~PWRC_ON_KEY_BIT;
	sirfsoc_rtc_iobrg_writel(int_mask, pwrcdrv->pwrc_base + PWRC_INT_MASK);
}

static int sirfsoc_pwrc_open(struct input_dev *input)
{
	struct sirfsoc_pwrc_drvdata *pwrcdrv = input_get_drvdata(input);

	sirfsoc_pwrc_toggle_interrupts(pwrcdrv, true);

	return 0;
}

static void sirfsoc_pwrc_close(struct input_dev *input)
{
	struct sirfsoc_pwrc_drvdata *pwrcdrv = input_get_drvdata(input);

	sirfsoc_pwrc_toggle_interrupts(pwrcdrv, false);
}

static const struct of_device_id sirfsoc_pwrc_of_match[] = {
	{ .compatible = "sirf,prima2-pwrc" },
	{},
}
MODULE_DEVICE_TABLE(of, sirfsoc_pwrc_of_match);

static int sirfsoc_pwrc_probe(struct platform_device *pdev)
{
	struct device_node *np = pdev->dev.of_node;
	struct sirfsoc_pwrc_drvdata *pwrcdrv;
	int irq;
	int error;

	pwrcdrv = devm_kzalloc(&pdev->dev, sizeof(struct sirfsoc_pwrc_drvdata),
			       GFP_KERNEL);
	if (!pwrcdrv) {
		dev_info(&pdev->dev, "Not enough memory for the device data\n");
		return -ENOMEM;
	}

	/*
	 * We can't use of_iomap because pwrc is not mapped in memory,
	 * the so-called base address is only offset in rtciobrg
	 */
	error = of_property_read_u32(np, "reg", &pwrcdrv->pwrc_base);
	if (error) {
		dev_err(&pdev->dev,
			"unable to find base address of pwrc node in dtb\n");
		return error;
	}

	pwrcdrv->input = devm_input_allocate_device(&pdev->dev);
	if (!pwrcdrv->input)
		return -ENOMEM;

	pwrcdrv->input->name = "sirfsoc pwrckey";
	pwrcdrv->input->phys = "pwrc/input0";
	pwrcdrv->input->evbit[0] = BIT_MASK(EV_PWR);

	pwrcdrv->input->open = sirfsoc_pwrc_open;
	pwrcdrv->input->close = sirfsoc_pwrc_close;

	input_set_drvdata(pwrcdrv->input, pwrcdrv);

	/* Make sure the device is quiesced */
	sirfsoc_pwrc_toggle_interrupts(pwrcdrv, false);

	irq = platform_get_irq(pdev, 0);
	error = devm_request_irq(&pdev->dev, irq,
				 sirfsoc_pwrc_isr, 0,
				 "sirfsoc_pwrc_int", pwrcdrv);
	if (error) {
		dev_err(&pdev->dev, "unable to claim irq %d, error: %d\n",
			irq, error);
		return error;
	}

	error = input_register_device(pwrcdrv->input);
	if (error) {
		dev_err(&pdev->dev,
			"unable to register input device, error: %d\n",
			error);
		return error;
	}

	platform_set_drvdata(pdev, pwrcdrv);
	device_init_wakeup(&pdev->dev, 1);

	return 0;
}

static int sirfsoc_pwrc_remove(struct platform_device *pdev)
{
	device_init_wakeup(&pdev->dev, 0);

	return 0;
}

#ifdef CONFIG_PM_SLEEP
static int sirfsoc_pwrc_resume(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct sirfsoc_pwrc_drvdata *pwrcdrv = platform_get_drvdata(pdev);
	struct input_dev *input = pwrcdrv->input;

	/*
	 * Do not mask pwrc interrupt as we want pwrc work as a wakeup source
	 * if users touch X_ONKEY_B, see arch/arm/mach-prima2/pm.c
	 */
	mutex_lock(&input->mutex);
	if (input->users)
		sirfsoc_pwrc_toggle_interrupts(pwrcdrv, true);
	mutex_unlock(&input->mutex);

	return 0;
}
#endif

static SIMPLE_DEV_PM_OPS(sirfsoc_pwrc_pm_ops, NULL, sirfsoc_pwrc_resume);

static struct platform_driver sirfsoc_pwrc_driver = {
	.probe		= sirfsoc_pwrc_probe,
	.remove		= sirfsoc_pwrc_remove,
	.driver		= {
		.name	= "sirfsoc-pwrc",
		.owner	= THIS_MODULE,
		.pm	= &sirfsoc_pwrc_pm_ops,
		.of_match_table = sirfsoc_pwrc_of_match,
	}
};

module_platform_driver(sirfsoc_pwrc_driver);

MODULE_LICENSE("GPLv2");
MODULE_AUTHOR("Binghua Duan <Binghua.Duan@csr.com>, Xianglong Du <Xianglong.Du@csr.com>");
MODULE_DESCRIPTION("CSR Prima2 PWRC Driver");
MODULE_ALIAS("platform:sirfsoc-pwrc");
Commit	Line	Data
9b5f953d BD	1	/*
	2	* Power key driver for SiRF PrimaII
	3	*
	4	* Copyright (c) 2013 Cambridge Silicon Radio Limited, a CSR plc group company.
	5	*
	6	* Licensed under GPLv2 or later.
	7	*/
	8
	9	#include <linux/module.h>
9b5f953d BD	10	#include <linux/interrupt.h>
	11	#include <linux/delay.h>
	12	#include <linux/platform_device.h>
	13	#include <linux/input.h>
	14	#include <linux/rtc/sirfsoc_rtciobrg.h>
	15	#include <linux/of.h>
	16
	17	struct sirfsoc_pwrc_drvdata {
	18	u32 pwrc_base;
	19	struct input_dev *input;
	20	};
	21
	22	#define PWRC_ON_KEY_BIT (1 << 0)
	23
	24	#define PWRC_INT_STATUS 0xc
	25	#define PWRC_INT_MASK 0x10
	26
	27	static irqreturn_t sirfsoc_pwrc_isr(int irq, void *dev_id)
	28	{
	29	struct sirfsoc_pwrc_drvdata *pwrcdrv = dev_id;
	30	u32 int_status;
	31
	32	int_status = sirfsoc_rtc_iobrg_readl(pwrcdrv->pwrc_base +
	33	PWRC_INT_STATUS);
	34	sirfsoc_rtc_iobrg_writel(int_status & ~PWRC_ON_KEY_BIT,
	35	pwrcdrv->pwrc_base + PWRC_INT_STATUS);
	36
	37	/*
	38	* For a typical Linux system, we report KEY_SUSPEND to trigger apm-power.c
	39	* to queue a SUSPEND APM event
	40	*/
	41	input_event(pwrcdrv->input, EV_PWR, KEY_SUSPEND, 1);
	42	input_sync(pwrcdrv->input);
	43
	44	/*
	45	* Todo: report KEY_POWER event for Android platforms, Android PowerManager
	46	* will handle the suspend and powerdown/hibernation
	47	*/
	48
	49	return IRQ_HANDLED;
	50	}
	51
864d3c0f DT	52	static void sirfsoc_pwrc_toggle_interrupts(struct sirfsoc_pwrc_drvdata *pwrcdrv,
	53	bool enable)
	54	{
	55	u32 int_mask;
	56
	57	int_mask = sirfsoc_rtc_iobrg_readl(pwrcdrv->pwrc_base + PWRC_INT_MASK);
	58	if (enable)
	59	int_mask \|= PWRC_ON_KEY_BIT;
	60	else
	61	int_mask &= ~PWRC_ON_KEY_BIT;
	62	sirfsoc_rtc_iobrg_writel(int_mask, pwrcdrv->pwrc_base + PWRC_INT_MASK);
	63	}
	64
	65	static int sirfsoc_pwrc_open(struct input_dev *input)
	66	{
	67	struct sirfsoc_pwrc_drvdata *pwrcdrv = input_get_drvdata(input);
	68
	69	sirfsoc_pwrc_toggle_interrupts(pwrcdrv, true);
	70
	71	return 0;
	72	}
	73
	74	static void sirfsoc_pwrc_close(struct input_dev *input)
	75	{
	76	struct sirfsoc_pwrc_drvdata *pwrcdrv = input_get_drvdata(input);
	77
	78	sirfsoc_pwrc_toggle_interrupts(pwrcdrv, false);
	79	}
	80
9b5f953d BD	81	static const struct of_device_id sirfsoc_pwrc_of_match[] = {
	82	{ .compatible = "sirf,prima2-pwrc" },
	83	{},
	84	}
	85	MODULE_DEVICE_TABLE(of, sirfsoc_pwrc_of_match);
	86
	87	static int sirfsoc_pwrc_probe(struct platform_device *pdev)
	88	{
	89	struct device_node *np = pdev->dev.of_node;
	90	struct sirfsoc_pwrc_drvdata *pwrcdrv;
	91	int irq;
	92	int error;
	93
	94	pwrcdrv = devm_kzalloc(&pdev->dev, sizeof(struct sirfsoc_pwrc_drvdata),
	95	GFP_KERNEL);
	96	if (!pwrcdrv) {
	97	dev_info(&pdev->dev, "Not enough memory for the device data\n");
	98	return -ENOMEM;
	99	}
	100
	101	/*
864d3c0f	102	* We can't use of_iomap because pwrc is not mapped in memory,
9b5f953d BD	103	* the so-called base address is only offset in rtciobrg
	104	*/
	105	error = of_property_read_u32(np, "reg", &pwrcdrv->pwrc_base);
	106	if (error) {
	107	dev_err(&pdev->dev,
	108	"unable to find base address of pwrc node in dtb\n");
	109	return error;
	110	}
	111
	112	pwrcdrv->input = devm_input_allocate_device(&pdev->dev);
	113	if (!pwrcdrv->input)
	114	return -ENOMEM;
	115
	116	pwrcdrv->input->name = "sirfsoc pwrckey";
	117	pwrcdrv->input->phys = "pwrc/input0";
	118	pwrcdrv->input->evbit[0] = BIT_MASK(EV_PWR);
	119
864d3c0f DT	120	pwrcdrv->input->open = sirfsoc_pwrc_open;
	121	pwrcdrv->input->close = sirfsoc_pwrc_close;
	122
	123	input_set_drvdata(pwrcdrv->input, pwrcdrv);
	124
	125	/* Make sure the device is quiesced */
	126	sirfsoc_pwrc_toggle_interrupts(pwrcdrv, false);
	127
9b5f953d BD	128	irq = platform_get_irq(pdev, 0);
9b5f953d BD	129	error = devm_request_irq(&pdev->dev, irq,
5099817e	130	sirfsoc_pwrc_isr, 0,
9b5f953d BD	131	"sirfsoc_pwrc_int", pwrcdrv);
	132	if (error) {
	133	dev_err(&pdev->dev, "unable to claim irq %d, error: %d\n",
	134	irq, error);
	135	return error;
	136	}
	137
9b5f953d BD	138	error = input_register_device(pwrcdrv->input);
	139	if (error) {
	140	dev_err(&pdev->dev,
	141	"unable to register input device, error: %d\n",
	142	error);
	143	return error;
	144	}
	145
	146	platform_set_drvdata(pdev, pwrcdrv);
	147	device_init_wakeup(&pdev->dev, 1);
	148
	149	return 0;
	150	}
	151
	152	static int sirfsoc_pwrc_remove(struct platform_device *pdev)
	153	{
	154	device_init_wakeup(&pdev->dev, 0);
	155
	156	return 0;
	157	}
	158
	159	#ifdef CONFIG_PM_SLEEP
3a80035b	160	static int sirfsoc_pwrc_resume(struct device *dev)
9b5f953d BD	161	{
	162	struct platform_device *pdev = to_platform_device(dev);
	163	struct sirfsoc_pwrc_drvdata *pwrcdrv = platform_get_drvdata(pdev);
864d3c0f	164	struct input_dev *input = pwrcdrv->input;
9b5f953d BD	165
	166	/*
	167	* Do not mask pwrc interrupt as we want pwrc work as a wakeup source
	168	* if users touch X_ONKEY_B, see arch/arm/mach-prima2/pm.c
	169	*/
864d3c0f DT	170	mutex_lock(&input->mutex);
	171	if (input->users)
	172	sirfsoc_pwrc_toggle_interrupts(pwrcdrv, true);
	173	mutex_unlock(&input->mutex);
9b5f953d BD	174
	175	return 0;
	176	}
	177	#endif
	178
3a80035b	179	static SIMPLE_DEV_PM_OPS(sirfsoc_pwrc_pm_ops, NULL, sirfsoc_pwrc_resume);
9b5f953d BD	180
	181	static struct platform_driver sirfsoc_pwrc_driver = {
	182	.probe = sirfsoc_pwrc_probe,
	183	.remove = sirfsoc_pwrc_remove,
	184	.driver = {
	185	.name = "sirfsoc-pwrc",
	186	.owner = THIS_MODULE,
	187	.pm = &sirfsoc_pwrc_pm_ops,
dee964c0	188	.of_match_table = sirfsoc_pwrc_of_match,
9b5f953d BD	189	}
	190	};
	191
	192	module_platform_driver(sirfsoc_pwrc_driver);
	193
	194	MODULE_LICENSE("GPLv2");
	195	MODULE_AUTHOR("Binghua Duan <Binghua.Duan@csr.com>, Xianglong Du <Xianglong.Du@csr.com>");
	196	MODULE_DESCRIPTION("CSR Prima2 PWRC Driver");
	197	MODULE_ALIAS("platform:sirfsoc-pwrc");