[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / input / joystick / as5011.c

/*
 * Copyright (c) 2010, 2011 Fabien Marteau <fabien.marteau@armadeus.com>
 * Sponsored by ARMadeus Systems
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * 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.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 *
 * Driver for Austria Microsystems joysticks AS5011
 *
 * TODO:
 *	- Power on the chip when open() and power down when close()
 *	- Manage power mode
 */

#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/input.h>
#include <linux/gpio.h>
#include <linux/delay.h>
#include <linux/input/as5011.h>
#include <linux/slab.h>
#include <linux/module.h>

#define DRIVER_DESC "Driver for Austria Microsystems AS5011 joystick"
#define MODULE_DEVICE_ALIAS "as5011"

MODULE_AUTHOR("Fabien Marteau <fabien.marteau@armadeus.com>");
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");

/* registers */
#define AS5011_CTRL1		0x76
#define AS5011_CTRL2		0x75
#define AS5011_XP		0x43
#define AS5011_XN		0x44
#define AS5011_YP		0x53
#define AS5011_YN		0x54
#define AS5011_X_REG		0x41
#define AS5011_Y_REG		0x42
#define AS5011_X_RES_INT	0x51
#define AS5011_Y_RES_INT	0x52

/* CTRL1 bits */
#define AS5011_CTRL1_LP_PULSED		0x80
#define AS5011_CTRL1_LP_ACTIVE		0x40
#define AS5011_CTRL1_LP_CONTINUE	0x20
#define AS5011_CTRL1_INT_WUP_EN		0x10
#define AS5011_CTRL1_INT_ACT_EN		0x08
#define AS5011_CTRL1_EXT_CLK_EN		0x04
#define AS5011_CTRL1_SOFT_RST		0x02
#define AS5011_CTRL1_DATA_VALID		0x01

/* CTRL2 bits */
#define AS5011_CTRL2_EXT_SAMPLE_EN	0x08
#define AS5011_CTRL2_RC_BIAS_ON		0x04
#define AS5011_CTRL2_INV_SPINNING	0x02

#define AS5011_MAX_AXIS	80
#define AS5011_MIN_AXIS	(-80)
#define AS5011_FUZZ	8
#define AS5011_FLAT	40

struct as5011_device {
	struct input_dev *input_dev;
	struct i2c_client *i2c_client;
	unsigned int button_gpio;
	unsigned int button_irq;
	unsigned int axis_irq;
};

static int as5011_i2c_write(struct i2c_client *client,
			    uint8_t aregaddr,
			    uint8_t avalue)
{
	uint8_t data[2] = { aregaddr, avalue };
	struct i2c_msg msg = {
		client->addr, I2C_M_IGNORE_NAK, 2, (uint8_t *)data
	};
	int error;

	error = i2c_transfer(client->adapter, &msg, 1);
	return error < 0 ? error : 0;
}

static int as5011_i2c_read(struct i2c_client *client,
			   uint8_t aregaddr, signed char *value)
{
	uint8_t data[2] = { aregaddr };
	struct i2c_msg msg_set[2] = {
		{ client->addr, I2C_M_REV_DIR_ADDR, 1, (uint8_t *)data },
		{ client->addr, I2C_M_RD | I2C_M_NOSTART, 1, (uint8_t *)data }
	};
	int error;

	error = i2c_transfer(client->adapter, msg_set, 2);
	if (error < 0)
		return error;

	*value = data[0] & 0x80 ? -1 * (1 + ~data[0]) : data[0];
	return 0;
}

static irqreturn_t as5011_button_interrupt(int irq, void *dev_id)
{
	struct as5011_device *as5011 = dev_id;
	int val = gpio_get_value_cansleep(as5011->button_gpio);

	input_report_key(as5011->input_dev, BTN_JOYSTICK, !val);
	input_sync(as5011->input_dev);

	return IRQ_HANDLED;
}

static irqreturn_t as5011_axis_interrupt(int irq, void *dev_id)
{
	struct as5011_device *as5011 = dev_id;
	int error;
	signed char x, y;

	error = as5011_i2c_read(as5011->i2c_client, AS5011_X_RES_INT, &x);
	if (error < 0)
		goto out;

	error = as5011_i2c_read(as5011->i2c_client, AS5011_Y_RES_INT, &y);
	if (error < 0)
		goto out;

	input_report_abs(as5011->input_dev, ABS_X, x);
	input_report_abs(as5011->input_dev, ABS_Y, y);
	input_sync(as5011->input_dev);

out:
	return IRQ_HANDLED;
}

static int __devinit as5011_configure_chip(struct as5011_device *as5011,
				const struct as5011_platform_data *plat_dat)
{
	struct i2c_client *client = as5011->i2c_client;
	int error;
	signed char value;

	/* chip soft reset */
	error = as5011_i2c_write(client, AS5011_CTRL1,
				 AS5011_CTRL1_SOFT_RST);
	if (error < 0) {
		dev_err(&client->dev, "Soft reset failed\n");
		return error;
	}

	mdelay(10);

	error = as5011_i2c_write(client, AS5011_CTRL1,
				 AS5011_CTRL1_LP_PULSED |
				 AS5011_CTRL1_LP_ACTIVE |
				 AS5011_CTRL1_INT_ACT_EN);
	if (error < 0) {
		dev_err(&client->dev, "Power config failed\n");
		return error;
	}

	error = as5011_i2c_write(client, AS5011_CTRL2,
				 AS5011_CTRL2_INV_SPINNING);
	if (error < 0) {
		dev_err(&client->dev, "Can't invert spinning\n");
		return error;
	}

	/* write threshold */
	error = as5011_i2c_write(client, AS5011_XP, plat_dat->xp);
	if (error < 0) {
		dev_err(&client->dev, "Can't write threshold\n");
		return error;
	}

	error = as5011_i2c_write(client, AS5011_XN, plat_dat->xn);
	if (error < 0) {
		dev_err(&client->dev, "Can't write threshold\n");
		return error;
	}

	error = as5011_i2c_write(client, AS5011_YP, plat_dat->yp);
	if (error < 0) {
		dev_err(&client->dev, "Can't write threshold\n");
		return error;
	}

	error = as5011_i2c_write(client, AS5011_YN, plat_dat->yn);
	if (error < 0) {
		dev_err(&client->dev, "Can't write threshold\n");
		return error;
	}

	/* to free irq gpio in chip */
	error = as5011_i2c_read(client, AS5011_X_RES_INT, &value);
	if (error < 0) {
		dev_err(&client->dev, "Can't read i2c X resolution value\n");
		return error;
	}

	return 0;
}

static int __devinit as5011_probe(struct i2c_client *client,
				const struct i2c_device_id *id)
{
	const struct as5011_platform_data *plat_data;
	struct as5011_device *as5011;
	struct input_dev *input_dev;
	int irq;
	int error;

	plat_data = client->dev.platform_data;
	if (!plat_data)
		return -EINVAL;

	if (!plat_data->axis_irq) {
		dev_err(&client->dev, "No axis IRQ?\n");
		return -EINVAL;
	}

	if (!i2c_check_functionality(client->adapter,
				     I2C_FUNC_NOSTART |
				     I2C_FUNC_PROTOCOL_MANGLING)) {
		dev_err(&client->dev,
			"need i2c bus that supports protocol mangling\n");
		return -ENODEV;
	}

	as5011 = kmalloc(sizeof(struct as5011_device), GFP_KERNEL);
	input_dev = input_allocate_device();
	if (!as5011 || !input_dev) {
		dev_err(&client->dev,
			"Can't allocate memory for device structure\n");
		error = -ENOMEM;
		goto err_free_mem;
	}

	as5011->i2c_client = client;
	as5011->input_dev = input_dev;
	as5011->button_gpio = plat_data->button_gpio;
	as5011->axis_irq = plat_data->axis_irq;

	input_dev->name = "Austria Microsystem as5011 joystick";
	input_dev->id.bustype = BUS_I2C;
	input_dev->dev.parent = &client->dev;

	__set_bit(EV_KEY, input_dev->evbit);
	__set_bit(EV_ABS, input_dev->evbit);
	__set_bit(BTN_JOYSTICK, input_dev->keybit);

	input_set_abs_params(input_dev, ABS_X,
		AS5011_MIN_AXIS, AS5011_MAX_AXIS, AS5011_FUZZ, AS5011_FLAT);
	input_set_abs_params(as5011->input_dev, ABS_Y,
		AS5011_MIN_AXIS, AS5011_MAX_AXIS, AS5011_FUZZ, AS5011_FLAT);

	error = gpio_request(as5011->button_gpio, "AS5011 button");
	if (error < 0) {
		dev_err(&client->dev, "Failed to request button gpio\n");
		goto err_free_mem;
	}

	irq = gpio_to_irq(as5011->button_gpio);
	if (irq < 0) {
		dev_err(&client->dev,
			"Failed to get irq number for button gpio\n");
		goto err_free_button_gpio;
	}

	as5011->button_irq = irq;

	error = request_threaded_irq(as5011->button_irq,
				     NULL, as5011_button_interrupt,
				     IRQF_TRIGGER_RISING |
					IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
				     "as5011_button", as5011);
	if (error < 0) {
		dev_err(&client->dev,
			"Can't allocate button irq %d\n", as5011->button_irq);
		goto err_free_button_gpio;
	}

	error = as5011_configure_chip(as5011, plat_data);
	if (error)
		goto err_free_button_irq;

	error = request_threaded_irq(as5011->axis_irq, NULL,
				     as5011_axis_interrupt,
				     plat_data->axis_irqflags | IRQF_ONESHOT,
				     "as5011_joystick", as5011);
	if (error) {
		dev_err(&client->dev,
			"Can't allocate axis irq %d\n", plat_data->axis_irq);
		goto err_free_button_irq;
	}

	error = input_register_device(as5011->input_dev);
	if (error) {
		dev_err(&client->dev, "Failed to register input device\n");
		goto err_free_axis_irq;
	}

	i2c_set_clientdata(client, as5011);

	return 0;

err_free_axis_irq:
	free_irq(as5011->axis_irq, as5011);
err_free_button_irq:
	free_irq(as5011->button_irq, as5011);
err_free_button_gpio:
	gpio_free(as5011->button_gpio);
err_free_mem:
	input_free_device(input_dev);
	kfree(as5011);

	return error;
}

static int __devexit as5011_remove(struct i2c_client *client)
{
	struct as5011_device *as5011 = i2c_get_clientdata(client);

	free_irq(as5011->axis_irq, as5011);
	free_irq(as5011->button_irq, as5011);
	gpio_free(as5011->button_gpio);

	input_unregister_device(as5011->input_dev);
	kfree(as5011);

	return 0;
}

static const struct i2c_device_id as5011_id[] = {
	{ MODULE_DEVICE_ALIAS, 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, as5011_id);

static struct i2c_driver as5011_driver = {
	.driver = {
		.name = "as5011",
	},
	.probe		= as5011_probe,
	.remove		= __devexit_p(as5011_remove),
	.id_table	= as5011_id,
};

module_i2c_driver(as5011_driver);
Commit	Line	Data
9d084a3d FM	1	/*
	2	* Copyright (c) 2010, 2011 Fabien Marteau <fabien.marteau@armadeus.com>
	3	* Sponsored by ARMadeus Systems
	4	*
	5	* This program is free software; you can redistribute it and/or modify
	6	* it under the terms of the GNU General Public License as published by
	7	* the Free Software Foundation; either version 2 of the License, or
	8	* (at your option) any later version.
	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	* You should have received a copy of the GNU General Public License
	16	* along with this program; if not, write to the Free Software
	17	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	18	*
	19	* Driver for Austria Microsystems joysticks AS5011
	20	*
	21	* TODO:
	22	* - Power on the chip when open() and power down when close()
	23	* - Manage power mode
	24	*/
	25
	26	#include <linux/i2c.h>
	27	#include <linux/interrupt.h>
	28	#include <linux/input.h>
	29	#include <linux/gpio.h>
	30	#include <linux/delay.h>
	31	#include <linux/input/as5011.h>
	32	#include <linux/slab.h>
d2d8442d	33	#include <linux/module.h>
9d084a3d FM	34
	35	#define DRIVER_DESC "Driver for Austria Microsystems AS5011 joystick"
	36	#define MODULE_DEVICE_ALIAS "as5011"
	37
	38	MODULE_AUTHOR("Fabien Marteau <fabien.marteau@armadeus.com>");
	39	MODULE_DESCRIPTION(DRIVER_DESC);
	40	MODULE_LICENSE("GPL");
	41
	42	/* registers */
	43	#define AS5011_CTRL1 0x76
	44	#define AS5011_CTRL2 0x75
	45	#define AS5011_XP 0x43
	46	#define AS5011_XN 0x44
	47	#define AS5011_YP 0x53
	48	#define AS5011_YN 0x54
	49	#define AS5011_X_REG 0x41
	50	#define AS5011_Y_REG 0x42
	51	#define AS5011_X_RES_INT 0x51
	52	#define AS5011_Y_RES_INT 0x52
	53
	54	/* CTRL1 bits */
	55	#define AS5011_CTRL1_LP_PULSED 0x80
	56	#define AS5011_CTRL1_LP_ACTIVE 0x40
	57	#define AS5011_CTRL1_LP_CONTINUE 0x20
	58	#define AS5011_CTRL1_INT_WUP_EN 0x10
	59	#define AS5011_CTRL1_INT_ACT_EN 0x08
	60	#define AS5011_CTRL1_EXT_CLK_EN 0x04
	61	#define AS5011_CTRL1_SOFT_RST 0x02
	62	#define AS5011_CTRL1_DATA_VALID 0x01
	63
	64	/* CTRL2 bits */
	65	#define AS5011_CTRL2_EXT_SAMPLE_EN 0x08
	66	#define AS5011_CTRL2_RC_BIAS_ON 0x04
	67	#define AS5011_CTRL2_INV_SPINNING 0x02
	68
	69	#define AS5011_MAX_AXIS 80
	70	#define AS5011_MIN_AXIS (-80)
	71	#define AS5011_FUZZ 8
	72	#define AS5011_FLAT 40
	73
	74	struct as5011_device {
	75	struct input_dev *input_dev;
	76	struct i2c_client *i2c_client;
	77	unsigned int button_gpio;
	78	unsigned int button_irq;
	79	unsigned int axis_irq;
	80	};
	81
	82	static int as5011_i2c_write(struct i2c_client *client,
	83	uint8_t aregaddr,
	84	uint8_t avalue)
	85	{
	86	uint8_t data[2] = { aregaddr, avalue };
	87	struct i2c_msg msg = {
	88	client->addr, I2C_M_IGNORE_NAK, 2, (uint8_t *)data
	89	};
	90	int error;
	91
	92	error = i2c_transfer(client->adapter, &msg, 1);
	93	return error < 0 ? error : 0;
	94	}
	95
	96	static int as5011_i2c_read(struct i2c_client *client,
	97	uint8_t aregaddr, signed char *value)
98	{
99	uint8_t data[2] = { aregaddr };
100	struct i2c_msg msg_set[2] = {
101	{ client->addr, I2C_M_REV_DIR_ADDR, 1, (uint8_t *)data },
102	{ client->addr, I2C_M_RD \| I2C_M_NOSTART, 1, (uint8_t *)data }
103	};
104	int error;
105
106	error = i2c_transfer(client->adapter, msg_set, 2);
107	if (error < 0)
108	return error;
109
110	value = data[0] & 0x80 ? -1 (1 + ~data[0]) : data[0];
111	return 0;
112	}
113
114	static irqreturn_t as5011_button_interrupt(int irq, void *dev_id)
115	{
116	struct as5011_device *as5011 = dev_id;
117	int val = gpio_get_value_cansleep(as5011->button_gpio);
118
119	input_report_key(as5011->input_dev, BTN_JOYSTICK, !val);
120	input_sync(as5011->input_dev);
121
122	return IRQ_HANDLED;
123	}
124
125	static irqreturn_t as5011_axis_interrupt(int irq, void *dev_id)
126	{
127	struct as5011_device *as5011 = dev_id;
128	int error;
129	signed char x, y;
130
131	error = as5011_i2c_read(as5011->i2c_client, AS5011_X_RES_INT, &x);
132	if (error < 0)
133	goto out;
134
135	error = as5011_i2c_read(as5011->i2c_client, AS5011_Y_RES_INT, &y);
136	if (error < 0)
137	goto out;
138
139	input_report_abs(as5011->input_dev, ABS_X, x);
140	input_report_abs(as5011->input_dev, ABS_Y, y);
141	input_sync(as5011->input_dev);
142
143	out:
144	return IRQ_HANDLED;
145	}
146
147	static int __devinit as5011_configure_chip(struct as5011_device *as5011,
148	const struct as5011_platform_data *plat_dat)
149	{
150	struct i2c_client *client = as5011->i2c_client;
151	int error;
152	signed char value;
153
154	/* chip soft reset */
155	error = as5011_i2c_write(client, AS5011_CTRL1,
156	AS5011_CTRL1_SOFT_RST);
157	if (error < 0) {
158	dev_err(&client->dev, "Soft reset failed\n");
159	return error;
160	}
161
162	mdelay(10);
163
164	error = as5011_i2c_write(client, AS5011_CTRL1,
165	AS5011_CTRL1_LP_PULSED \|
166	AS5011_CTRL1_LP_ACTIVE \|
167	AS5011_CTRL1_INT_ACT_EN);
168	if (error < 0) {
169	dev_err(&client->dev, "Power config failed\n");
170	return error;
171	}
172
173	error = as5011_i2c_write(client, AS5011_CTRL2,
174	AS5011_CTRL2_INV_SPINNING);
175	if (error < 0) {
176	dev_err(&client->dev, "Can't invert spinning\n");
177	return error;
178	}
179
180	/* write threshold */
181	error = as5011_i2c_write(client, AS5011_XP, plat_dat->xp);
182	if (error < 0) {
183	dev_err(&client->dev, "Can't write threshold\n");
184	return error;
185	}
186
187	error = as5011_i2c_write(client, AS5011_XN, plat_dat->xn);
188	if (error < 0) {
189	dev_err(&client->dev, "Can't write threshold\n");
190	return error;
191	}
192
193	error = as5011_i2c_write(client, AS5011_YP, plat_dat->yp);
194	if (error < 0) {
195	dev_err(&client->dev, "Can't write threshold\n");
196	return error;
197	}
198
199	error = as5011_i2c_write(client, AS5011_YN, plat_dat->yn);
200	if (error < 0) {
201	dev_err(&client->dev, "Can't write threshold\n");
202	return error;
203	}
204
205	/* to free irq gpio in chip */
206	error = as5011_i2c_read(client, AS5011_X_RES_INT, &value);
207	if (error < 0) {
208	dev_err(&client->dev, "Can't read i2c X resolution value\n");
209	return error;
210	}
211
212	return 0;
213	}
214
215	static int __devinit as5011_probe(struct i2c_client *client,
216	const struct i2c_device_id *id)
217	{
218	const struct as5011_platform_data *plat_data;
219	struct as5011_device *as5011;
220	struct input_dev *input_dev;
221	int irq;
222	int error;
223
224	plat_data = client->dev.platform_data;
225	if (!plat_data)
226	return -EINVAL;
227
228	if (!plat_data->axis_irq) {
229	dev_err(&client->dev, "No axis IRQ?\n");
230	return -EINVAL;
231	}
232
233	if (!i2c_check_functionality(client->adapter,
14674e70	234	I2C_FUNC_NOSTART \|
9d084a3d FM	235	I2C_FUNC_PROTOCOL_MANGLING)) {
	236	dev_err(&client->dev,
	237	"need i2c bus that supports protocol mangling\n");
	238	return -ENODEV;
	239	}
	240
	241	as5011 = kmalloc(sizeof(struct as5011_device), GFP_KERNEL);
	242	input_dev = input_allocate_device();
	243	if (!as5011 \|\| !input_dev) {
	244	dev_err(&client->dev,
	245	"Can't allocate memory for device structure\n");
	246	error = -ENOMEM;
	247	goto err_free_mem;
	248	}
	249
	250	as5011->i2c_client = client;
	251	as5011->input_dev = input_dev;
	252	as5011->button_gpio = plat_data->button_gpio;
	253	as5011->axis_irq = plat_data->axis_irq;
	254
	255	input_dev->name = "Austria Microsystem as5011 joystick";
	256	input_dev->id.bustype = BUS_I2C;
	257	input_dev->dev.parent = &client->dev;
	258
	259	__set_bit(EV_KEY, input_dev->evbit);
	260	__set_bit(EV_ABS, input_dev->evbit);
	261	__set_bit(BTN_JOYSTICK, input_dev->keybit);
	262
	263	input_set_abs_params(input_dev, ABS_X,
	264	AS5011_MIN_AXIS, AS5011_MAX_AXIS, AS5011_FUZZ, AS5011_FLAT);
	265	input_set_abs_params(as5011->input_dev, ABS_Y,
	266	AS5011_MIN_AXIS, AS5011_MAX_AXIS, AS5011_FUZZ, AS5011_FLAT);
	267
	268	error = gpio_request(as5011->button_gpio, "AS5011 button");
	269	if (error < 0) {
	270	dev_err(&client->dev, "Failed to request button gpio\n");
	271	goto err_free_mem;
	272	}
	273
	274	irq = gpio_to_irq(as5011->button_gpio);
	275	if (irq < 0) {
	276	dev_err(&client->dev,
	277	"Failed to get irq number for button gpio\n");
	278	goto err_free_button_gpio;
	279	}
	280
	281	as5011->button_irq = irq;
	282
	283	error = request_threaded_irq(as5011->button_irq,
	284	NULL, as5011_button_interrupt,
9b7e31bb LPC	285	IRQF_TRIGGER_RISING \|
9b7e31bb LPC	286	IRQF_TRIGGER_FALLING \| IRQF_ONESHOT,
9d084a3d FM	287	"as5011_button", as5011);
	288	if (error < 0) {
	289	dev_err(&client->dev,
	290	"Can't allocate button irq %d\n", as5011->button_irq);
	291	goto err_free_button_gpio;
	292	}
	293
	294	error = as5011_configure_chip(as5011, plat_data);
	295	if (error)
	296	goto err_free_button_irq;
	297
	298	error = request_threaded_irq(as5011->axis_irq, NULL,
	299	as5011_axis_interrupt,
9b7e31bb	300	plat_data->axis_irqflags \| IRQF_ONESHOT,
9d084a3d FM	301	"as5011_joystick", as5011);
	302	if (error) {
	303	dev_err(&client->dev,
	304	"Can't allocate axis irq %d\n", plat_data->axis_irq);
	305	goto err_free_button_irq;
	306	}
	307
	308	error = input_register_device(as5011->input_dev);
	309	if (error) {
	310	dev_err(&client->dev, "Failed to register input device\n");
	311	goto err_free_axis_irq;
	312	}
	313
	314	i2c_set_clientdata(client, as5011);
	315
	316	return 0;
	317
	318	err_free_axis_irq:
	319	free_irq(as5011->axis_irq, as5011);
	320	err_free_button_irq:
	321	free_irq(as5011->button_irq, as5011);
	322	err_free_button_gpio:
	323	gpio_free(as5011->button_gpio);
	324	err_free_mem:
	325	input_free_device(input_dev);
	326	kfree(as5011);
	327
	328	return error;
	329	}
	330
	331	static int __devexit as5011_remove(struct i2c_client *client)
	332	{
	333	struct as5011_device *as5011 = i2c_get_clientdata(client);
	334
	335	free_irq(as5011->axis_irq, as5011);
	336	free_irq(as5011->button_irq, as5011);
	337	gpio_free(as5011->button_gpio);
	338
	339	input_unregister_device(as5011->input_dev);
	340	kfree(as5011);
	341
	342	return 0;
	343	}
	344
	345	static const struct i2c_device_id as5011_id[] = {
	346	{ MODULE_DEVICE_ALIAS, 0 },
	347	{ }
	348	};
	349	MODULE_DEVICE_TABLE(i2c, as5011_id);
	350
	351	static struct i2c_driver as5011_driver = {
	352	.driver = {
	353	.name = "as5011",
	354	},
	355	.probe = as5011_probe,
	356	.remove = __devexit_p(as5011_remove),
	357	.id_table = as5011_id,
	358	};
	359
1b92c1cf	360	module_i2c_driver(as5011_driver);