[linux-2.6-block.git] / drivers / input / misc / axp20x-pek.c

/*
 * axp20x power button driver.
 *
 * Copyright (C) 2013 Carlo Caione <carlo@caione.org>
 *
 * This file is subject to the terms and conditions of the GNU General
 * Public License. See the file "COPYING" in the main directory of this
 * archive for more details.
 *
 * 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/errno.h>
#include <linux/irq.h>
#include <linux/init.h>
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/mfd/axp20x.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/slab.h>

#define AXP20X_PEK_STARTUP_MASK		(0xc0)
#define AXP20X_PEK_SHUTDOWN_MASK	(0x03)

struct axp20x_pek {
	struct axp20x_dev *axp20x;
	struct input_dev *input;
	int irq_dbr;
	int irq_dbf;
};

struct axp20x_time {
	unsigned int time;
	unsigned int idx;
};

static const struct axp20x_time startup_time[] = {
	{ .time = 128,  .idx = 0 },
	{ .time = 1000, .idx = 2 },
	{ .time = 3000, .idx = 1 },
	{ .time = 2000, .idx = 3 },
};

static const struct axp20x_time shutdown_time[] = {
	{ .time = 4000,  .idx = 0 },
	{ .time = 6000,  .idx = 1 },
	{ .time = 8000,  .idx = 2 },
	{ .time = 10000, .idx = 3 },
};

struct axp20x_pek_ext_attr {
	const struct axp20x_time *p_time;
	unsigned int mask;
};

static struct axp20x_pek_ext_attr axp20x_pek_startup_ext_attr = {
	.p_time	= startup_time,
	.mask	= AXP20X_PEK_STARTUP_MASK,
};

static struct axp20x_pek_ext_attr axp20x_pek_shutdown_ext_attr = {
	.p_time	= shutdown_time,
	.mask	= AXP20X_PEK_SHUTDOWN_MASK,
};

static struct axp20x_pek_ext_attr *get_axp_ext_attr(struct device_attribute *attr)
{
	return container_of(attr, struct dev_ext_attribute, attr)->var;
}

static ssize_t axp20x_show_ext_attr(struct device *dev,
				    struct device_attribute *attr, char *buf)
{
	struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);
	struct axp20x_pek_ext_attr *axp20x_ea = get_axp_ext_attr(attr);
	unsigned int val;
	int ret, i;

	ret = regmap_read(axp20x_pek->axp20x->regmap, AXP20X_PEK_KEY, &val);
	if (ret != 0)
		return ret;

	val &= axp20x_ea->mask;
	val >>= ffs(axp20x_ea->mask) - 1;

	for (i = 0; i < 4; i++)
		if (val == axp20x_ea->p_time[i].idx)
			val = axp20x_ea->p_time[i].time;

	return sprintf(buf, "%u\n", val);
}

static ssize_t axp20x_store_ext_attr(struct device *dev,
				     struct device_attribute *attr,
				     const char *buf, size_t count)
{
	struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);
	struct axp20x_pek_ext_attr *axp20x_ea = get_axp_ext_attr(attr);
	char val_str[20];
	size_t len;
	int ret, i;
	unsigned int val, idx = 0;
	unsigned int best_err = UINT_MAX;

	val_str[sizeof(val_str) - 1] = '\0';
	strncpy(val_str, buf, sizeof(val_str) - 1);
	len = strlen(val_str);

	if (len && val_str[len - 1] == '\n')
		val_str[len - 1] = '\0';

	ret = kstrtouint(val_str, 10, &val);
	if (ret)
		return ret;

	for (i = 3; i >= 0; i--) {
		unsigned int err;

		err = abs(axp20x_ea->p_time[i].time - val);
		if (err < best_err) {
			best_err = err;
			idx = axp20x_ea->p_time[i].idx;
		}

		if (!err)
			break;
	}

	idx <<= ffs(axp20x_ea->mask) - 1;
	ret = regmap_update_bits(axp20x_pek->axp20x->regmap,
				 AXP20X_PEK_KEY,
				 axp20x_ea->mask, idx);
	if (ret != 0)
		return -EINVAL;

	return count;
}

static struct dev_ext_attribute axp20x_dev_attr_startup = {
	.attr	= __ATTR(startup, 0644, axp20x_show_ext_attr, axp20x_store_ext_attr),
	.var	= &axp20x_pek_startup_ext_attr,
};

static struct dev_ext_attribute axp20x_dev_attr_shutdown = {
	.attr	= __ATTR(shutdown, 0644, axp20x_show_ext_attr, axp20x_store_ext_attr),
	.var	= &axp20x_pek_shutdown_ext_attr,
};

static struct attribute *axp20x_attributes[] = {
	&axp20x_dev_attr_startup.attr.attr,
	&axp20x_dev_attr_shutdown.attr.attr,
	NULL,
};

static const struct attribute_group axp20x_attribute_group = {
	.attrs = axp20x_attributes,
};

static irqreturn_t axp20x_pek_irq(int irq, void *pwr)
{
	struct input_dev *idev = pwr;
	struct axp20x_pek *axp20x_pek = input_get_drvdata(idev);

	/*
	 * The power-button is connected to ground so a falling edge (dbf)
	 * means it is pressed.
	 */
	if (irq == axp20x_pek->irq_dbf)
		input_report_key(idev, KEY_POWER, true);
	else if (irq == axp20x_pek->irq_dbr)
		input_report_key(idev, KEY_POWER, false);

	input_sync(idev);

	return IRQ_HANDLED;
}

static void axp20x_remove_sysfs_group(void *_data)
{
	struct device *dev = _data;

	sysfs_remove_group(&dev->kobj, &axp20x_attribute_group);
}

static int axp20x_pek_probe(struct platform_device *pdev)
{
	struct axp20x_pek *axp20x_pek;
	struct axp20x_dev *axp20x;
	struct input_dev *idev;
	int error;

	axp20x_pek = devm_kzalloc(&pdev->dev, sizeof(struct axp20x_pek),
				  GFP_KERNEL);
	if (!axp20x_pek)
		return -ENOMEM;

	axp20x_pek->axp20x = dev_get_drvdata(pdev->dev.parent);
	axp20x = axp20x_pek->axp20x;

	axp20x_pek->irq_dbr = platform_get_irq_byname(pdev, "PEK_DBR");
	if (axp20x_pek->irq_dbr < 0) {
		dev_err(&pdev->dev, "No IRQ for PEK_DBR, error=%d\n",
				axp20x_pek->irq_dbr);
		return axp20x_pek->irq_dbr;
	}
	axp20x_pek->irq_dbr = regmap_irq_get_virq(axp20x->regmap_irqc,
						  axp20x_pek->irq_dbr);

	axp20x_pek->irq_dbf = platform_get_irq_byname(pdev, "PEK_DBF");
	if (axp20x_pek->irq_dbf < 0) {
		dev_err(&pdev->dev, "No IRQ for PEK_DBF, error=%d\n",
				axp20x_pek->irq_dbf);
		return axp20x_pek->irq_dbf;
	}
	axp20x_pek->irq_dbf = regmap_irq_get_virq(axp20x->regmap_irqc,
						  axp20x_pek->irq_dbf);

	axp20x_pek->input = devm_input_allocate_device(&pdev->dev);
	if (!axp20x_pek->input)
		return -ENOMEM;

	idev = axp20x_pek->input;

	idev->name = "axp20x-pek";
	idev->phys = "m1kbd/input2";
	idev->dev.parent = &pdev->dev;

	input_set_capability(idev, EV_KEY, KEY_POWER);

	input_set_drvdata(idev, axp20x_pek);

	error = devm_request_any_context_irq(&pdev->dev, axp20x_pek->irq_dbr,
					     axp20x_pek_irq, 0,
					     "axp20x-pek-dbr", idev);
	if (error < 0) {
		dev_err(axp20x->dev, "Failed to request dbr IRQ#%d: %d\n",
			axp20x_pek->irq_dbr, error);
		return error;
	}

	error = devm_request_any_context_irq(&pdev->dev, axp20x_pek->irq_dbf,
					  axp20x_pek_irq, 0,
					  "axp20x-pek-dbf", idev);
	if (error < 0) {
		dev_err(axp20x->dev, "Failed to request dbf IRQ#%d: %d\n",
			axp20x_pek->irq_dbf, error);
		return error;
	}

	error = sysfs_create_group(&pdev->dev.kobj, &axp20x_attribute_group);
	if (error) {
		dev_err(axp20x->dev, "Failed to create sysfs attributes: %d\n",
			error);
		return error;
	}

	error = devm_add_action(&pdev->dev,
				axp20x_remove_sysfs_group, &pdev->dev);
	if (error) {
		axp20x_remove_sysfs_group(&pdev->dev);
		dev_err(&pdev->dev, "Failed to add sysfs cleanup action: %d\n",
			error);
		return error;
	}

	error = input_register_device(idev);
	if (error) {
		dev_err(axp20x->dev, "Can't register input device: %d\n",
			error);
		return error;
	}

	platform_set_drvdata(pdev, axp20x_pek);

	return 0;
}

static struct platform_driver axp20x_pek_driver = {
	.probe		= axp20x_pek_probe,
	.driver		= {
		.name		= "axp20x-pek",
	},
};
module_platform_driver(axp20x_pek_driver);

MODULE_DESCRIPTION("axp20x Power Button");
MODULE_AUTHOR("Carlo Caione <carlo@caione.org>");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:axp20x-pek");
Commit	Line	Data
5b6c26a9 CC	1	/*
	2	* axp20x power button driver.
	3	*
	4	* Copyright (C) 2013 Carlo Caione <carlo@caione.org>
	5	*
	6	* This file is subject to the terms and conditions of the GNU General
	7	* Public License. See the file "COPYING" in the main directory of this
	8	* archive for more details.
	9	*
	10	* This program is distributed in the hope that it will be useful,
	11	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	12	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	13	* GNU General Public License for more details.
	14	*/
	15
	16	#include <linux/errno.h>
	17	#include <linux/irq.h>
	18	#include <linux/init.h>
	19	#include <linux/input.h>
	20	#include <linux/interrupt.h>
	21	#include <linux/kernel.h>
	22	#include <linux/mfd/axp20x.h>
	23	#include <linux/module.h>
	24	#include <linux/platform_device.h>
	25	#include <linux/regmap.h>
	26	#include <linux/slab.h>
	27
	28	#define AXP20X_PEK_STARTUP_MASK (0xc0)
	29	#define AXP20X_PEK_SHUTDOWN_MASK (0x03)
	30
	31	struct axp20x_pek {
	32	struct axp20x_dev *axp20x;
	33	struct input_dev *input;
	34	int irq_dbr;
	35	int irq_dbf;
	36	};
	37
	38	struct axp20x_time {
	39	unsigned int time;
	40	unsigned int idx;
	41	};
	42
	43	static const struct axp20x_time startup_time[] = {
	44	{ .time = 128, .idx = 0 },
	45	{ .time = 1000, .idx = 2 },
	46	{ .time = 3000, .idx = 1 },
	47	{ .time = 2000, .idx = 3 },
	48	};
	49
	50	static const struct axp20x_time shutdown_time[] = {
	51	{ .time = 4000, .idx = 0 },
	52	{ .time = 6000, .idx = 1 },
	53	{ .time = 8000, .idx = 2 },
	54	{ .time = 10000, .idx = 3 },
	55	};
	56
	57	struct axp20x_pek_ext_attr {
	58	const struct axp20x_time *p_time;
	59	unsigned int mask;
	60	};
	61
	62	static struct axp20x_pek_ext_attr axp20x_pek_startup_ext_attr = {
	63	.p_time = startup_time,
	64	.mask = AXP20X_PEK_STARTUP_MASK,
65	};
66
67	static struct axp20x_pek_ext_attr axp20x_pek_shutdown_ext_attr = {
68	.p_time = shutdown_time,
69	.mask = AXP20X_PEK_SHUTDOWN_MASK,
70	};
71
72	static struct axp20x_pek_ext_attr get_axp_ext_attr(struct device_attribute attr)
73	{
74	return container_of(attr, struct dev_ext_attribute, attr)->var;
75	}
76
77	static ssize_t axp20x_show_ext_attr(struct device *dev,
78	struct device_attribute attr, char buf)
79	{
80	struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);
81	struct axp20x_pek_ext_attr *axp20x_ea = get_axp_ext_attr(attr);
82	unsigned int val;
83	int ret, i;
84
85	ret = regmap_read(axp20x_pek->axp20x->regmap, AXP20X_PEK_KEY, &val);
86	if (ret != 0)
87	return ret;
88
89	val &= axp20x_ea->mask;
90	val >>= ffs(axp20x_ea->mask) - 1;
91
92	for (i = 0; i < 4; i++)
93	if (val == axp20x_ea->p_time[i].idx)
94	val = axp20x_ea->p_time[i].time;
95
96	return sprintf(buf, "%u\n", val);
97	}
98
99	static ssize_t axp20x_store_ext_attr(struct device *dev,
100	struct device_attribute *attr,
101	const char *buf, size_t count)
102	{
103	struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);
104	struct axp20x_pek_ext_attr *axp20x_ea = get_axp_ext_attr(attr);
105	char val_str[20];
106	size_t len;
107	int ret, i;
108	unsigned int val, idx = 0;
109	unsigned int best_err = UINT_MAX;
110
111	val_str[sizeof(val_str) - 1] = '\0';
112	strncpy(val_str, buf, sizeof(val_str) - 1);
113	len = strlen(val_str);
114
115	if (len && val_str[len - 1] == '\n')
116	val_str[len - 1] = '\0';
117
118	ret = kstrtouint(val_str, 10, &val);
119	if (ret)
120	return ret;
121
122	for (i = 3; i >= 0; i--) {
123	unsigned int err;
124
125	err = abs(axp20x_ea->p_time[i].time - val);
126	if (err < best_err) {
127	best_err = err;
128	idx = axp20x_ea->p_time[i].idx;
129	}
130
131	if (!err)
132	break;
133	}
134
135	idx <<= ffs(axp20x_ea->mask) - 1;
136	ret = regmap_update_bits(axp20x_pek->axp20x->regmap,
137	AXP20X_PEK_KEY,
138	axp20x_ea->mask, idx);
139	if (ret != 0)
140	return -EINVAL;
b388de88	141
5b6c26a9 CC	142	return count;
	143	}
	144
	145	static struct dev_ext_attribute axp20x_dev_attr_startup = {
	146	.attr = __ATTR(startup, 0644, axp20x_show_ext_attr, axp20x_store_ext_attr),
b388de88	147	.var = &axp20x_pek_startup_ext_attr,
5b6c26a9 CC	148	};
	149
	150	static struct dev_ext_attribute axp20x_dev_attr_shutdown = {
	151	.attr = __ATTR(shutdown, 0644, axp20x_show_ext_attr, axp20x_store_ext_attr),
b388de88 DT	152	.var = &axp20x_pek_shutdown_ext_attr,
	153	};
	154
	155	static struct attribute *axp20x_attributes[] = {
	156	&axp20x_dev_attr_startup.attr.attr,
	157	&axp20x_dev_attr_shutdown.attr.attr,
	158	NULL,
	159	};
	160
	161	static const struct attribute_group axp20x_attribute_group = {
	162	.attrs = axp20x_attributes,
5b6c26a9 CC	163	};
	164
	165	static irqreturn_t axp20x_pek_irq(int irq, void *pwr)
	166	{
	167	struct input_dev *idev = pwr;
	168	struct axp20x_pek *axp20x_pek = input_get_drvdata(idev);
	169
eeeee40f HG	170	/*
	171	* The power-button is connected to ground so a falling edge (dbf)
	172	* means it is pressed.
	173	*/
	174	if (irq == axp20x_pek->irq_dbf)
5b6c26a9	175	input_report_key(idev, KEY_POWER, true);
eeeee40f	176	else if (irq == axp20x_pek->irq_dbr)
5b6c26a9 CC	177	input_report_key(idev, KEY_POWER, false);
	178
	179	input_sync(idev);
	180
	181	return IRQ_HANDLED;
	182	}
	183
b388de88 DT	184	static void axp20x_remove_sysfs_group(void *_data)
	185	{
	186	struct device *dev = _data;
	187
	188	sysfs_remove_group(&dev->kobj, &axp20x_attribute_group);
	189	}
	190
5b6c26a9 CC	191	static int axp20x_pek_probe(struct platform_device *pdev)
	192	{
	193	struct axp20x_pek *axp20x_pek;
	194	struct axp20x_dev *axp20x;
	195	struct input_dev *idev;
	196	int error;
	197
	198	axp20x_pek = devm_kzalloc(&pdev->dev, sizeof(struct axp20x_pek),
	199	GFP_KERNEL);
	200	if (!axp20x_pek)
	201	return -ENOMEM;
	202
	203	axp20x_pek->axp20x = dev_get_drvdata(pdev->dev.parent);
	204	axp20x = axp20x_pek->axp20x;
	205
	206	axp20x_pek->irq_dbr = platform_get_irq_byname(pdev, "PEK_DBR");
	207	if (axp20x_pek->irq_dbr < 0) {
	208	dev_err(&pdev->dev, "No IRQ for PEK_DBR, error=%d\n",
	209	axp20x_pek->irq_dbr);
	210	return axp20x_pek->irq_dbr;
	211	}
	212	axp20x_pek->irq_dbr = regmap_irq_get_virq(axp20x->regmap_irqc,
	213	axp20x_pek->irq_dbr);
	214
	215	axp20x_pek->irq_dbf = platform_get_irq_byname(pdev, "PEK_DBF");
	216	if (axp20x_pek->irq_dbf < 0) {
	217	dev_err(&pdev->dev, "No IRQ for PEK_DBF, error=%d\n",
	218	axp20x_pek->irq_dbf);
	219	return axp20x_pek->irq_dbf;
	220	}
	221	axp20x_pek->irq_dbf = regmap_irq_get_virq(axp20x->regmap_irqc,
	222	axp20x_pek->irq_dbf);
	223
	224	axp20x_pek->input = devm_input_allocate_device(&pdev->dev);
	225	if (!axp20x_pek->input)
	226	return -ENOMEM;
	227
	228	idev = axp20x_pek->input;
	229
	230	idev->name = "axp20x-pek";
	231	idev->phys = "m1kbd/input2";
	232	idev->dev.parent = &pdev->dev;
	233
	234	input_set_capability(idev, EV_KEY, KEY_POWER);
	235
	236	input_set_drvdata(idev, axp20x_pek);
	237
	238	error = devm_request_any_context_irq(&pdev->dev, axp20x_pek->irq_dbr,
b388de88 DT	239	axp20x_pek_irq, 0,
b388de88 DT	240	"axp20x-pek-dbr", idev);
5b6c26a9 CC	241	if (error < 0) {
	242	dev_err(axp20x->dev, "Failed to request dbr IRQ#%d: %d\n",
	243	axp20x_pek->irq_dbr, error);
5b6c26a9 CC	244	return error;
	245	}
	246
	247	error = devm_request_any_context_irq(&pdev->dev, axp20x_pek->irq_dbf,
	248	axp20x_pek_irq, 0,
	249	"axp20x-pek-dbf", idev);
	250	if (error < 0) {
	251	dev_err(axp20x->dev, "Failed to request dbf IRQ#%d: %d\n",
	252	axp20x_pek->irq_dbf, error);
	253	return error;
	254	}
	255
b388de88 DT	256	error = sysfs_create_group(&pdev->dev.kobj, &axp20x_attribute_group);
	257	if (error) {
	258	dev_err(axp20x->dev, "Failed to create sysfs attributes: %d\n",
	259	error);
5b6c26a9	260	return error;
b388de88	261	}
5b6c26a9	262
b388de88 DT	263	error = devm_add_action(&pdev->dev,
	264	axp20x_remove_sysfs_group, &pdev->dev);
	265	if (error) {
	266	axp20x_remove_sysfs_group(&pdev->dev);
	267	dev_err(&pdev->dev, "Failed to add sysfs cleanup action: %d\n",
	268	error);
	269	return error;
	270	}
5b6c26a9 CC	271
	272	error = input_register_device(idev);
	273	if (error) {
	274	dev_err(axp20x->dev, "Can't register input device: %d\n",
	275	error);
b388de88	276	return error;
5b6c26a9 CC	277	}
	278
	279	platform_set_drvdata(pdev, axp20x_pek);
	280
5b6c26a9 CC	281	return 0;
	282	}
	283
	284	static struct platform_driver axp20x_pek_driver = {
	285	.probe = axp20x_pek_probe,
5b6c26a9 CC	286	.driver = {
	287	.name = "axp20x-pek",
	288	},
	289	};
	290	module_platform_driver(axp20x_pek_driver);
	291
	292	MODULE_DESCRIPTION("axp20x Power Button");
	293	MODULE_AUTHOR("Carlo Caione <carlo@caione.org>");
	294	MODULE_LICENSE("GPL");
b6e26546	295	MODULE_ALIAS("platform:axp20x-pek");