[mirror_ubuntu-hirsute-kernel.git] / drivers / input / misc / pmic8xxx-pwrkey.c

/* Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 and
 * only version 2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/log2.h>

#include <linux/mfd/pm8xxx/core.h>
#include <linux/input/pmic8xxx-pwrkey.h>

#define PON_CNTL_1 0x1C
#define PON_CNTL_PULL_UP BIT(7)
#define PON_CNTL_TRIG_DELAY_MASK (0x7)

/**
 * struct pmic8xxx_pwrkey - pmic8xxx pwrkey information
 * @key_press_irq: key press irq number
 */
struct pmic8xxx_pwrkey {
	struct input_dev *pwr;
	int key_press_irq;
};

static irqreturn_t pwrkey_press_irq(int irq, void *_pwrkey)
{
	struct pmic8xxx_pwrkey *pwrkey = _pwrkey;

	input_report_key(pwrkey->pwr, KEY_POWER, 1);
	input_sync(pwrkey->pwr);

	return IRQ_HANDLED;
}

static irqreturn_t pwrkey_release_irq(int irq, void *_pwrkey)
{
	struct pmic8xxx_pwrkey *pwrkey = _pwrkey;

	input_report_key(pwrkey->pwr, KEY_POWER, 0);
	input_sync(pwrkey->pwr);

	return IRQ_HANDLED;
}

#ifdef CONFIG_PM_SLEEP
static int pmic8xxx_pwrkey_suspend(struct device *dev)
{
	struct pmic8xxx_pwrkey *pwrkey = dev_get_drvdata(dev);

	if (device_may_wakeup(dev))
		enable_irq_wake(pwrkey->key_press_irq);

	return 0;
}

static int pmic8xxx_pwrkey_resume(struct device *dev)
{
	struct pmic8xxx_pwrkey *pwrkey = dev_get_drvdata(dev);

	if (device_may_wakeup(dev))
		disable_irq_wake(pwrkey->key_press_irq);

	return 0;
}
#endif

static SIMPLE_DEV_PM_OPS(pm8xxx_pwr_key_pm_ops,
		pmic8xxx_pwrkey_suspend, pmic8xxx_pwrkey_resume);

static int __devinit pmic8xxx_pwrkey_probe(struct platform_device *pdev)
{
	struct input_dev *pwr;
	int key_release_irq = platform_get_irq(pdev, 0);
	int key_press_irq = platform_get_irq(pdev, 1);
	int err;
	unsigned int delay;
	u8 pon_cntl;
	struct pmic8xxx_pwrkey *pwrkey;
	const struct pm8xxx_pwrkey_platform_data *pdata = mfd_get_data(pdev);

	if (!pdata) {
		dev_err(&pdev->dev, "power key platform data not supplied\n");
		return -EINVAL;
	}

	if (pdata->kpd_trigger_delay_us > 62500) {
		dev_err(&pdev->dev, "invalid power key trigger delay\n");
		return -EINVAL;
	}

	pwrkey = kzalloc(sizeof(*pwrkey), GFP_KERNEL);
	if (!pwrkey)
		return -ENOMEM;

	pwr = input_allocate_device();
	if (!pwr) {
		dev_dbg(&pdev->dev, "Can't allocate power button\n");
		err = -ENOMEM;
		goto free_pwrkey;
	}

	input_set_capability(pwr, EV_KEY, KEY_POWER);

	pwr->name = "pmic8xxx_pwrkey";
	pwr->phys = "pmic8xxx_pwrkey/input0";
	pwr->dev.parent = &pdev->dev;

	delay = (pdata->kpd_trigger_delay_us << 10) / USEC_PER_SEC;
	delay = 1 + ilog2(delay);

	err = pm8xxx_readb(pdev->dev.parent, PON_CNTL_1, &pon_cntl);
	if (err < 0) {
		dev_err(&pdev->dev, "failed reading PON_CNTL_1 err=%d\n", err);
		goto free_input_dev;
	}

	pon_cntl &= ~PON_CNTL_TRIG_DELAY_MASK;
	pon_cntl |= (delay & PON_CNTL_TRIG_DELAY_MASK);
	if (pdata->pull_up)
		pon_cntl |= PON_CNTL_PULL_UP;
	else
		pon_cntl &= ~PON_CNTL_PULL_UP;

	err = pm8xxx_writeb(pdev->dev.parent, PON_CNTL_1, pon_cntl);
	if (err < 0) {
		dev_err(&pdev->dev, "failed writing PON_CNTL_1 err=%d\n", err);
		goto free_input_dev;
	}

	err = input_register_device(pwr);
	if (err) {
		dev_dbg(&pdev->dev, "Can't register power key: %d\n", err);
		goto free_input_dev;
	}

	pwrkey->key_press_irq = key_press_irq;
	pwrkey->pwr = pwr;

	platform_set_drvdata(pdev, pwrkey);

	err = request_irq(key_press_irq, pwrkey_press_irq,
		IRQF_TRIGGER_RISING, "pmic8xxx_pwrkey_press", pwrkey);
	if (err < 0) {
		dev_dbg(&pdev->dev, "Can't get %d IRQ for pwrkey: %d\n",
				 key_press_irq, err);
		goto unreg_input_dev;
	}

	err = request_irq(key_release_irq, pwrkey_release_irq,
		 IRQF_TRIGGER_RISING, "pmic8xxx_pwrkey_release", pwrkey);
	if (err < 0) {
		dev_dbg(&pdev->dev, "Can't get %d IRQ for pwrkey: %d\n",
				 key_release_irq, err);

		goto free_press_irq;
	}

	device_init_wakeup(&pdev->dev, pdata->wakeup);

	return 0;

free_press_irq:
	free_irq(key_press_irq, NULL);
unreg_input_dev:
	platform_set_drvdata(pdev, NULL);
	input_unregister_device(pwr);
	pwr = NULL;
free_input_dev:
	input_free_device(pwr);
free_pwrkey:
	kfree(pwrkey);
	return err;
}

static int __devexit pmic8xxx_pwrkey_remove(struct platform_device *pdev)
{
	struct pmic8xxx_pwrkey *pwrkey = platform_get_drvdata(pdev);
	int key_release_irq = platform_get_irq(pdev, 0);
	int key_press_irq = platform_get_irq(pdev, 1);

	device_init_wakeup(&pdev->dev, 0);

	free_irq(key_press_irq, pwrkey);
	free_irq(key_release_irq, pwrkey);
	input_unregister_device(pwrkey->pwr);
	platform_set_drvdata(pdev, NULL);
	kfree(pwrkey);

	return 0;
}

static struct platform_driver pmic8xxx_pwrkey_driver = {
	.probe		= pmic8xxx_pwrkey_probe,
	.remove		= __devexit_p(pmic8xxx_pwrkey_remove),
	.driver		= {
		.name	= PM8XXX_PWRKEY_DEV_NAME,
		.owner	= THIS_MODULE,
		.pm	= &pm8xxx_pwr_key_pm_ops,
	},
};

static int __init pmic8xxx_pwrkey_init(void)
{
	return platform_driver_register(&pmic8xxx_pwrkey_driver);
}
module_init(pmic8xxx_pwrkey_init);

static void __exit pmic8xxx_pwrkey_exit(void)
{
	platform_driver_unregister(&pmic8xxx_pwrkey_driver);
}
module_exit(pmic8xxx_pwrkey_exit);

MODULE_ALIAS("platform:pmic8xxx_pwrkey");
MODULE_DESCRIPTION("PMIC8XXX Power Key driver");
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Trilok Soni <tsoni@codeaurora.org>");
Commit	Line	Data
92d57a73 TS	1	/* Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved.
	2	*
	3	* This program is free software; you can redistribute it and/or modify
	4	* it under the terms of the GNU General Public License version 2 and
	5	* only version 2 as published by the Free Software Foundation.
	6	*
	7	* This program is distributed in the hope that it will be useful,
	8	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	9	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	10	* GNU General Public License for more details.
	11	*/
	12
	13	#include <linux/module.h>
	14	#include <linux/init.h>
	15	#include <linux/kernel.h>
	16	#include <linux/errno.h>
	17	#include <linux/slab.h>
	18	#include <linux/input.h>
	19	#include <linux/interrupt.h>
	20	#include <linux/platform_device.h>
	21	#include <linux/log2.h>
	22
	23	#include <linux/mfd/pm8xxx/core.h>
	24	#include <linux/input/pmic8xxx-pwrkey.h>
	25
	26	#define PON_CNTL_1 0x1C
	27	#define PON_CNTL_PULL_UP BIT(7)
	28	#define PON_CNTL_TRIG_DELAY_MASK (0x7)
	29
	30	/**
	31	* struct pmic8xxx_pwrkey - pmic8xxx pwrkey information
	32	* @key_press_irq: key press irq number
	33	*/
	34	struct pmic8xxx_pwrkey {
	35	struct input_dev *pwr;
	36	int key_press_irq;
	37	};
	38
	39	static irqreturn_t pwrkey_press_irq(int irq, void *_pwrkey)
	40	{
	41	struct pmic8xxx_pwrkey *pwrkey = _pwrkey;
	42
	43	input_report_key(pwrkey->pwr, KEY_POWER, 1);
	44	input_sync(pwrkey->pwr);
	45
	46	return IRQ_HANDLED;
	47	}
	48
	49	static irqreturn_t pwrkey_release_irq(int irq, void *_pwrkey)
	50	{
	51	struct pmic8xxx_pwrkey *pwrkey = _pwrkey;
	52
	53	input_report_key(pwrkey->pwr, KEY_POWER, 0);
	54	input_sync(pwrkey->pwr);
	55
	56	return IRQ_HANDLED;
	57	}
	58
	59	#ifdef CONFIG_PM_SLEEP
	60	static int pmic8xxx_pwrkey_suspend(struct device *dev)
	61	{
	62	struct pmic8xxx_pwrkey *pwrkey = dev_get_drvdata(dev);
	63
	64	if (device_may_wakeup(dev))
65	enable_irq_wake(pwrkey->key_press_irq);
66
67	return 0;
68	}
69
70	static int pmic8xxx_pwrkey_resume(struct device *dev)
71	{
72	struct pmic8xxx_pwrkey *pwrkey = dev_get_drvdata(dev);
73
74	if (device_may_wakeup(dev))
75	disable_irq_wake(pwrkey->key_press_irq);
76
77	return 0;
78	}
79	#endif
80
81	static SIMPLE_DEV_PM_OPS(pm8xxx_pwr_key_pm_ops,
82	pmic8xxx_pwrkey_suspend, pmic8xxx_pwrkey_resume);
83
84	static int __devinit pmic8xxx_pwrkey_probe(struct platform_device *pdev)
85	{
86	struct input_dev *pwr;
87	int key_release_irq = platform_get_irq(pdev, 0);
88	int key_press_irq = platform_get_irq(pdev, 1);
89	int err;
90	unsigned int delay;
91	u8 pon_cntl;
92	struct pmic8xxx_pwrkey *pwrkey;
93	const struct pm8xxx_pwrkey_platform_data *pdata = mfd_get_data(pdev);
94
95	if (!pdata) {
96	dev_err(&pdev->dev, "power key platform data not supplied\n");
97	return -EINVAL;
98	}
99
100	if (pdata->kpd_trigger_delay_us > 62500) {
101	dev_err(&pdev->dev, "invalid power key trigger delay\n");
102	return -EINVAL;
103	}
104
105	pwrkey = kzalloc(sizeof(*pwrkey), GFP_KERNEL);
106	if (!pwrkey)
107	return -ENOMEM;
108
109	pwr = input_allocate_device();
110	if (!pwr) {
111	dev_dbg(&pdev->dev, "Can't allocate power button\n");
112	err = -ENOMEM;
113	goto free_pwrkey;
114	}
115
116	input_set_capability(pwr, EV_KEY, KEY_POWER);
117
118	pwr->name = "pmic8xxx_pwrkey";
119	pwr->phys = "pmic8xxx_pwrkey/input0";
120	pwr->dev.parent = &pdev->dev;
121
122	delay = (pdata->kpd_trigger_delay_us << 10) / USEC_PER_SEC;
123	delay = 1 + ilog2(delay);
124
125	err = pm8xxx_readb(pdev->dev.parent, PON_CNTL_1, &pon_cntl);
126	if (err < 0) {
127	dev_err(&pdev->dev, "failed reading PON_CNTL_1 err=%d\n", err);
128	goto free_input_dev;
129	}
130
131	pon_cntl &= ~PON_CNTL_TRIG_DELAY_MASK;
132	pon_cntl \|= (delay & PON_CNTL_TRIG_DELAY_MASK);
133	if (pdata->pull_up)
134	pon_cntl \|= PON_CNTL_PULL_UP;
135	else
136	pon_cntl &= ~PON_CNTL_PULL_UP;
137
138	err = pm8xxx_writeb(pdev->dev.parent, PON_CNTL_1, pon_cntl);
139	if (err < 0) {
140	dev_err(&pdev->dev, "failed writing PON_CNTL_1 err=%d\n", err);
141	goto free_input_dev;
142	}
143
144	err = input_register_device(pwr);
145	if (err) {
146	dev_dbg(&pdev->dev, "Can't register power key: %d\n", err);
147	goto free_input_dev;
148	}
149
150	pwrkey->key_press_irq = key_press_irq;
151	pwrkey->pwr = pwr;
152
153	platform_set_drvdata(pdev, pwrkey);
154
155	err = request_irq(key_press_irq, pwrkey_press_irq,
156	IRQF_TRIGGER_RISING, "pmic8xxx_pwrkey_press", pwrkey);
157	if (err < 0) {
158	dev_dbg(&pdev->dev, "Can't get %d IRQ for pwrkey: %d\n",
159	key_press_irq, err);
160	goto unreg_input_dev;
161	}
162
163	err = request_irq(key_release_irq, pwrkey_release_irq,
164	IRQF_TRIGGER_RISING, "pmic8xxx_pwrkey_release", pwrkey);
165	if (err < 0) {
166	dev_dbg(&pdev->dev, "Can't get %d IRQ for pwrkey: %d\n",
167	key_release_irq, err);
168
169	goto free_press_irq;
170	}
171
172	device_init_wakeup(&pdev->dev, pdata->wakeup);
173
174	return 0;
175
176	free_press_irq:
177	free_irq(key_press_irq, NULL);
178	unreg_input_dev:
179	platform_set_drvdata(pdev, NULL);
180	input_unregister_device(pwr);
181	pwr = NULL;
182	free_input_dev:
183	input_free_device(pwr);
184	free_pwrkey:
185	kfree(pwrkey);
186	return err;
187	}
188
189	static int __devexit pmic8xxx_pwrkey_remove(struct platform_device *pdev)
190	{
191	struct pmic8xxx_pwrkey *pwrkey = platform_get_drvdata(pdev);
192	int key_release_irq = platform_get_irq(pdev, 0);
193	int key_press_irq = platform_get_irq(pdev, 1);
194
195	device_init_wakeup(&pdev->dev, 0);
196
197	free_irq(key_press_irq, pwrkey);
198	free_irq(key_release_irq, pwrkey);
199	input_unregister_device(pwrkey->pwr);
200	platform_set_drvdata(pdev, NULL);
201	kfree(pwrkey);
202
203	return 0;
204	}
205
206	static struct platform_driver pmic8xxx_pwrkey_driver = {
207	.probe = pmic8xxx_pwrkey_probe,
208	.remove = __devexit_p(pmic8xxx_pwrkey_remove),
209	.driver = {
210	.name = PM8XXX_PWRKEY_DEV_NAME,
211	.owner = THIS_MODULE,
212	.pm = &pm8xxx_pwr_key_pm_ops,
213	},
214	};
215
216	static int __init pmic8xxx_pwrkey_init(void)
217	{
218	return platform_driver_register(&pmic8xxx_pwrkey_driver);
219	}
220	module_init(pmic8xxx_pwrkey_init);
221
222	static void __exit pmic8xxx_pwrkey_exit(void)
223	{
224	platform_driver_unregister(&pmic8xxx_pwrkey_driver);
225	}
226	module_exit(pmic8xxx_pwrkey_exit);
227
228	MODULE_ALIAS("platform:pmic8xxx_pwrkey");
229	MODULE_DESCRIPTION("PMIC8XXX Power Key driver");
230	MODULE_LICENSE("GPL v2");
231	MODULE_AUTHOR("Trilok Soni <tsoni@codeaurora.org>");