[linux-2.6-block.git] / drivers / input / misc / kxtj9.c

/*
 * Copyright (C) 2011 Kionix, Inc.
 * Written by Chris Hudson <chudson@kionix.com>
 *
 * 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 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
 */

#include <linux/delay.h>
#include <linux/i2c.h>
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/slab.h>
#include <linux/input/kxtj9.h>
#include <linux/input-polldev.h>

#define NAME			"kxtj9"
#define G_MAX			8000
/* OUTPUT REGISTERS */
#define XOUT_L			0x06
#define WHO_AM_I		0x0F
/* CONTROL REGISTERS */
#define INT_REL			0x1A
#define CTRL_REG1		0x1B
#define INT_CTRL1		0x1E
#define DATA_CTRL		0x21
/* CONTROL REGISTER 1 BITS */
#define PC1_OFF			0x7F
#define PC1_ON			(1 << 7)
/* Data ready funtion enable bit: set during probe if using irq mode */
#define DRDYE			(1 << 5)
/* INTERRUPT CONTROL REGISTER 1 BITS */
/* Set these during probe if using irq mode */
#define KXTJ9_IEL		(1 << 3)
#define KXTJ9_IEA		(1 << 4)
#define KXTJ9_IEN		(1 << 5)
/* INPUT_ABS CONSTANTS */
#define FUZZ			3
#define FLAT			3
/* RESUME STATE INDICES */
#define RES_DATA_CTRL		0
#define RES_CTRL_REG1		1
#define RES_INT_CTRL1		2
#define RESUME_ENTRIES		3

/*
 * The following table lists the maximum appropriate poll interval for each
 * available output data rate.
 */
static const struct {
	unsigned int cutoff;
	u8 mask;
} kxtj9_odr_table[] = {
	{ 3,	ODR800F },
	{ 5,	ODR400F },
	{ 10,	ODR200F },
	{ 20,	ODR100F },
	{ 40,	ODR50F  },
	{ 80,	ODR25F  },
	{ 0,	ODR12_5F},
};

struct kxtj9_data {
	struct i2c_client *client;
	struct kxtj9_platform_data pdata;
	struct input_dev *input_dev;
#ifdef CONFIG_INPUT_KXTJ9_POLLED_MODE
	struct input_polled_dev *poll_dev;
#endif
	unsigned int last_poll_interval;
	u8 shift;
	u8 ctrl_reg1;
	u8 data_ctrl;
	u8 int_ctrl;
};

static int kxtj9_i2c_read(struct kxtj9_data *tj9, u8 addr, u8 *data, int len)
{
	struct i2c_msg msgs[] = {
		{
			.addr = tj9->client->addr,
			.flags = tj9->client->flags,
			.len = 1,
			.buf = &addr,
		},
		{
			.addr = tj9->client->addr,
			.flags = tj9->client->flags | I2C_M_RD,
			.len = len,
			.buf = data,
		},
	};

	return i2c_transfer(tj9->client->adapter, msgs, 2);
}

static void kxtj9_report_acceleration_data(struct kxtj9_data *tj9)
{
	s16 acc_data[3]; /* Data bytes from hardware xL, xH, yL, yH, zL, zH */
	s16 x, y, z;
	int err;

	err = kxtj9_i2c_read(tj9, XOUT_L, (u8 *)acc_data, 6);
	if (err < 0)
		dev_err(&tj9->client->dev, "accelerometer data read failed\n");

	x = le16_to_cpu(acc_data[tj9->pdata.axis_map_x]) >> tj9->shift;
	y = le16_to_cpu(acc_data[tj9->pdata.axis_map_y]) >> tj9->shift;
	z = le16_to_cpu(acc_data[tj9->pdata.axis_map_z]) >> tj9->shift;

	input_report_abs(tj9->input_dev, ABS_X, tj9->pdata.negate_x ? -x : x);
	input_report_abs(tj9->input_dev, ABS_Y, tj9->pdata.negate_y ? -y : y);
	input_report_abs(tj9->input_dev, ABS_Z, tj9->pdata.negate_z ? -z : z);
	input_sync(tj9->input_dev);
}

static irqreturn_t kxtj9_isr(int irq, void *dev)
{
	struct kxtj9_data *tj9 = dev;
	int err;

	/* data ready is the only possible interrupt type */
	kxtj9_report_acceleration_data(tj9);

	err = i2c_smbus_read_byte_data(tj9->client, INT_REL);
	if (err < 0)
		dev_err(&tj9->client->dev,
			"error clearing interrupt status: %d\n", err);

	return IRQ_HANDLED;
}

static int kxtj9_update_g_range(struct kxtj9_data *tj9, u8 new_g_range)
{
	switch (new_g_range) {
	case KXTJ9_G_2G:
		tj9->shift = 4;
		break;
	case KXTJ9_G_4G:
		tj9->shift = 3;
		break;
	case KXTJ9_G_8G:
		tj9->shift = 2;
		break;
	default:
		return -EINVAL;
	}

	tj9->ctrl_reg1 &= 0xe7;
	tj9->ctrl_reg1 |= new_g_range;

	return 0;
}

static int kxtj9_update_odr(struct kxtj9_data *tj9, unsigned int poll_interval)
{
	int err;
	int i;

	/* Use the lowest ODR that can support the requested poll interval */
	for (i = 0; i < ARRAY_SIZE(kxtj9_odr_table); i++) {
		tj9->data_ctrl = kxtj9_odr_table[i].mask;
		if (poll_interval < kxtj9_odr_table[i].cutoff)
			break;
	}

	err = i2c_smbus_write_byte_data(tj9->client, CTRL_REG1, 0);
	if (err < 0)
		return err;

	err = i2c_smbus_write_byte_data(tj9->client, DATA_CTRL, tj9->data_ctrl);
	if (err < 0)
		return err;

	err = i2c_smbus_write_byte_data(tj9->client, CTRL_REG1, tj9->ctrl_reg1);
	if (err < 0)
		return err;

	return 0;
}

static int kxtj9_device_power_on(struct kxtj9_data *tj9)
{
	if (tj9->pdata.power_on)
		return tj9->pdata.power_on();

	return 0;
}

static void kxtj9_device_power_off(struct kxtj9_data *tj9)
{
	int err;

	tj9->ctrl_reg1 &= PC1_OFF;
	err = i2c_smbus_write_byte_data(tj9->client, CTRL_REG1, tj9->ctrl_reg1);
	if (err < 0)
		dev_err(&tj9->client->dev, "soft power off failed\n");

	if (tj9->pdata.power_off)
		tj9->pdata.power_off();
}

static int kxtj9_enable(struct kxtj9_data *tj9)
{
	int err;

	err = kxtj9_device_power_on(tj9);
	if (err < 0)
		return err;

	/* ensure that PC1 is cleared before updating control registers */
	err = i2c_smbus_write_byte_data(tj9->client, CTRL_REG1, 0);
	if (err < 0)
		return err;

	/* only write INT_CTRL_REG1 if in irq mode */
	if (tj9->client->irq) {
		err = i2c_smbus_write_byte_data(tj9->client,
						INT_CTRL1, tj9->int_ctrl);
		if (err < 0)
			return err;
	}

	err = kxtj9_update_g_range(tj9, tj9->pdata.g_range);
	if (err < 0)
		return err;

	/* turn on outputs */
	tj9->ctrl_reg1 |= PC1_ON;
	err = i2c_smbus_write_byte_data(tj9->client, CTRL_REG1, tj9->ctrl_reg1);
	if (err < 0)
		return err;

	err = kxtj9_update_odr(tj9, tj9->last_poll_interval);
	if (err < 0)
		return err;

	/* clear initial interrupt if in irq mode */
	if (tj9->client->irq) {
		err = i2c_smbus_read_byte_data(tj9->client, INT_REL);
		if (err < 0) {
			dev_err(&tj9->client->dev,
				"error clearing interrupt: %d\n", err);
			goto fail;
		}
	}

	return 0;

fail:
	kxtj9_device_power_off(tj9);
	return err;
}

static void kxtj9_disable(struct kxtj9_data *tj9)
{
	kxtj9_device_power_off(tj9);
}

static int kxtj9_input_open(struct input_dev *input)
{
	struct kxtj9_data *tj9 = input_get_drvdata(input);

	return kxtj9_enable(tj9);
}

static void kxtj9_input_close(struct input_dev *dev)
{
	struct kxtj9_data *tj9 = input_get_drvdata(dev);

	kxtj9_disable(tj9);
}

static void __devinit kxtj9_init_input_device(struct kxtj9_data *tj9,
					      struct input_dev *input_dev)
{
	__set_bit(EV_ABS, input_dev->evbit);
	input_set_abs_params(input_dev, ABS_X, -G_MAX, G_MAX, FUZZ, FLAT);
	input_set_abs_params(input_dev, ABS_Y, -G_MAX, G_MAX, FUZZ, FLAT);
	input_set_abs_params(input_dev, ABS_Z, -G_MAX, G_MAX, FUZZ, FLAT);

	input_dev->name = "kxtj9_accel";
	input_dev->id.bustype = BUS_I2C;
	input_dev->dev.parent = &tj9->client->dev;
}

static int __devinit kxtj9_setup_input_device(struct kxtj9_data *tj9)
{
	struct input_dev *input_dev;
	int err;

	input_dev = input_allocate_device();
	if (!tj9->input_dev) {
		dev_err(&tj9->client->dev, "input device allocate failed\n");
		return -ENOMEM;
	}

	tj9->input_dev = input_dev;

	input_dev->open = kxtj9_input_open;
	input_dev->close = kxtj9_input_close;
	input_set_drvdata(input_dev, tj9);

	kxtj9_init_input_device(tj9, input_dev);

	err = input_register_device(tj9->input_dev);
	if (err) {
		dev_err(&tj9->client->dev,
			"unable to register input polled device %s: %d\n",
			tj9->input_dev->name, err);
		input_free_device(tj9->input_dev);
		return err;
	}

	return 0;
}

/*
 * When IRQ mode is selected, we need to provide an interface to allow the user
 * to change the output data rate of the part.  For consistency, we are using
 * the set_poll method, which accepts a poll interval in milliseconds, and then
 * calls update_odr() while passing this value as an argument.  In IRQ mode, the
 * data outputs will not be read AT the requested poll interval, rather, the
 * lowest ODR that can support the requested interval.  The client application
 * will be responsible for retrieving data from the input node at the desired
 * interval.
 */

/* Returns currently selected poll interval (in ms) */
static ssize_t kxtj9_get_poll(struct device *dev,
				struct device_attribute *attr, char *buf)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct kxtj9_data *tj9 = i2c_get_clientdata(client);

	return sprintf(buf, "%d\n", tj9->last_poll_interval);
}

/* Allow users to select a new poll interval (in ms) */
static ssize_t kxtj9_set_poll(struct device *dev, struct device_attribute *attr,
						const char *buf, size_t count)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct kxtj9_data *tj9 = i2c_get_clientdata(client);
	struct input_dev *input_dev = tj9->input_dev;
	unsigned int interval;
	int error;

	error = kstrtouint(buf, 10, &interval);
	if (error < 0)
		return error;

	/* Lock the device to prevent races with open/close (and itself) */
	mutex_unlock(&input_dev->mutex);

	disable_irq(client->irq);

	/*
	 * Set current interval to the greater of the minimum interval or
	 * the requested interval
	 */
	tj9->last_poll_interval = max(interval, tj9->pdata.min_interval);

	kxtj9_update_odr(tj9, tj9->last_poll_interval);

	enable_irq(client->irq);
	mutex_unlock(&input_dev->mutex);

	return count;
}

static DEVICE_ATTR(poll, S_IRUGO|S_IWUSR, kxtj9_get_poll, kxtj9_set_poll);

static struct attribute *kxtj9_attributes[] = {
	&dev_attr_poll.attr,
	NULL
};

static struct attribute_group kxtj9_attribute_group = {
	.attrs = kxtj9_attributes
};


#ifdef CONFIG_INPUT_KXTJ9_POLLED_MODE
static void kxtj9_poll(struct input_polled_dev *dev)
{
	struct kxtj9_data *tj9 = dev->private;
	unsigned int poll_interval = dev->poll_interval;

	kxtj9_report_acceleration_data(tj9);

	if (poll_interval != tj9->last_poll_interval) {
		kxtj9_update_odr(tj9, poll_interval);
		tj9->last_poll_interval = poll_interval;
	}
}

static void kxtj9_polled_input_open(struct input_polled_dev *dev)
{
	struct kxtj9_data *tj9 = dev->private;

	kxtj9_enable(tj9);
}

static void kxtj9_polled_input_close(struct input_polled_dev *dev)
{
	struct kxtj9_data *tj9 = dev->private;

	kxtj9_disable(tj9);
}

static int __devinit kxtj9_setup_polled_device(struct kxtj9_data *tj9)
{
	int err;
	struct input_polled_dev *poll_dev;
	poll_dev = input_allocate_polled_device();

	if (!poll_dev) {
		dev_err(&tj9->client->dev,
			"Failed to allocate polled device\n");
		return -ENOMEM;
	}

	tj9->poll_dev = poll_dev;
	tj9->input_dev = poll_dev->input;

	poll_dev->private = tj9;
	poll_dev->poll = kxtj9_poll;
	poll_dev->open = kxtj9_polled_input_open;
	poll_dev->close = kxtj9_polled_input_close;

	kxtj9_init_input_device(tj9, poll_dev->input);

	err = input_register_polled_device(poll_dev);
	if (err) {
		dev_err(&tj9->client->dev,
			"Unable to register polled device, err=%d\n", err);
		input_free_polled_device(poll_dev);
		return err;
	}

	return 0;
}

static void __devexit kxtj9_teardown_polled_device(struct kxtj9_data *tj9)
{
	input_unregister_polled_device(tj9->poll_dev);
	input_free_polled_device(tj9->poll_dev);
}

#else

static inline int kxtj9_setup_polled_device(struct kxtj9_data *tj9)
{
	return -ENOSYS;
}

static inline void kxtj9_teardown_polled_device(struct kxtj9_data *tj9)
{
}

#endif

static int __devinit kxtj9_verify(struct kxtj9_data *tj9)
{
	int retval;

	retval = kxtj9_device_power_on(tj9);
	if (retval < 0)
		return retval;

	retval = i2c_smbus_read_byte_data(tj9->client, WHO_AM_I);
	if (retval < 0) {
		dev_err(&tj9->client->dev, "read err int source\n");
		goto out;
	}

	retval = retval != 0x06 ? -EIO : 0;

out:
	kxtj9_device_power_off(tj9);
	return retval;
}

static int __devinit kxtj9_probe(struct i2c_client *client,
				 const struct i2c_device_id *id)
{
	const struct kxtj9_platform_data *pdata = client->dev.platform_data;
	struct kxtj9_data *tj9;
	int err;

	if (!i2c_check_functionality(client->adapter,
				I2C_FUNC_I2C | I2C_FUNC_SMBUS_BYTE_DATA)) {
		dev_err(&client->dev, "client is not i2c capable\n");
		return -ENXIO;
	}

	if (!pdata) {
		dev_err(&client->dev, "platform data is NULL; exiting\n");
		return -EINVAL;
	}

	tj9 = kzalloc(sizeof(*tj9), GFP_KERNEL);
	if (!tj9) {
		dev_err(&client->dev,
			"failed to allocate memory for module data\n");
		return -ENOMEM;
	}

	tj9->client = client;
	tj9->pdata = *pdata;

	if (pdata->init) {
		err = pdata->init();
		if (err < 0)
			goto err_free_mem;
	}

	err = kxtj9_verify(tj9);
	if (err < 0) {
		dev_err(&client->dev, "device not recognized\n");
		goto err_pdata_exit;
	}

	i2c_set_clientdata(client, tj9);

	tj9->ctrl_reg1 = tj9->pdata.res_12bit | tj9->pdata.g_range;
	tj9->data_ctrl = tj9->pdata.data_odr_init;

	if (client->irq) {
		/* If in irq mode, populate INT_CTRL_REG1 and enable DRDY. */
		tj9->int_ctrl |= KXTJ9_IEN | KXTJ9_IEA | KXTJ9_IEL;
		tj9->ctrl_reg1 |= DRDYE;

		err = kxtj9_setup_input_device(tj9);
		if (err)
			goto err_pdata_exit;

		err = request_threaded_irq(client->irq, NULL, kxtj9_isr,
					   IRQF_TRIGGER_RISING | IRQF_ONESHOT,
					   "kxtj9-irq", tj9);
		if (err) {
			dev_err(&client->dev, "request irq failed: %d\n", err);
			goto err_destroy_input;
		}

		err = sysfs_create_group(&client->dev.kobj, &kxtj9_attribute_group);
		if (err) {
			dev_err(&client->dev, "sysfs create failed: %d\n", err);
			goto err_free_irq;
		}

	} else {
		err = kxtj9_setup_polled_device(tj9);
		if (err)
			goto err_pdata_exit;
	}

	return 0;

err_free_irq:
	free_irq(client->irq, tj9);
err_destroy_input:
	input_unregister_device(tj9->input_dev);
err_pdata_exit:
	if (tj9->pdata.exit)
		tj9->pdata.exit();
err_free_mem:
	kfree(tj9);
	return err;
}

static int __devexit kxtj9_remove(struct i2c_client *client)
{
	struct kxtj9_data *tj9 = i2c_get_clientdata(client);

	if (client->irq) {
		sysfs_remove_group(&client->dev.kobj, &kxtj9_attribute_group);
		free_irq(client->irq, tj9);
		input_unregister_device(tj9->input_dev);
	} else {
		kxtj9_teardown_polled_device(tj9);
	}

	if (tj9->pdata.exit)
		tj9->pdata.exit();

	kfree(tj9);

	return 0;
}

#ifdef CONFIG_PM_SLEEP
static int kxtj9_suspend(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct kxtj9_data *tj9 = i2c_get_clientdata(client);
	struct input_dev *input_dev = tj9->input_dev;

	mutex_lock(&input_dev->mutex);

	if (input_dev->users)
		kxtj9_disable(tj9);

	mutex_unlock(&input_dev->mutex);
	return 0;
}

static int kxtj9_resume(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct kxtj9_data *tj9 = i2c_get_clientdata(client);
	struct input_dev *input_dev = tj9->input_dev;
	int retval = 0;

	mutex_lock(&input_dev->mutex);

	if (input_dev->users)
		kxtj9_enable(tj9);

	mutex_unlock(&input_dev->mutex);
	return retval;
}
#endif

static SIMPLE_DEV_PM_OPS(kxtj9_pm_ops, kxtj9_suspend, kxtj9_resume);

static const struct i2c_device_id kxtj9_id[] = {
	{ NAME, 0 },
	{ },
};

MODULE_DEVICE_TABLE(i2c, kxtj9_id);

static struct i2c_driver kxtj9_driver = {
	.driver = {
		.name	= NAME,
		.owner	= THIS_MODULE,
		.pm	= &kxtj9_pm_ops,
	},
	.probe		= kxtj9_probe,
	.remove		= __devexit_p(kxtj9_remove),
	.id_table	= kxtj9_id,
};

static int __init kxtj9_init(void)
{
	return i2c_add_driver(&kxtj9_driver);
}
module_init(kxtj9_init);

static void __exit kxtj9_exit(void)
{
	i2c_del_driver(&kxtj9_driver);
}
module_exit(kxtj9_exit);

MODULE_DESCRIPTION("KXTJ9 accelerometer driver");
MODULE_AUTHOR("Chris Hudson <chudson@kionix.com>");
MODULE_LICENSE("GPL");
Commit	Line	Data
e8e70d83 CH	1	/*
	2	* Copyright (C) 2011 Kionix, Inc.
	3	* Written by Chris Hudson <chudson@kionix.com>
	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 version 2 as
	7	* published by the Free Software Foundation.
	8	*
	9	* This program is distributed in the hope that it will be useful,
	10	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	11	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	12	* GNU General Public License for more details.
	13	*
	14	* You should have received a copy of the GNU General Public License
	15	* along with this program; if not, write to the Free Software
	16	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
	17	* 02111-1307, USA
	18	*/
	19
	20	#include <linux/delay.h>
	21	#include <linux/i2c.h>
	22	#include <linux/input.h>
	23	#include <linux/interrupt.h>
	24	#include <linux/slab.h>
	25	#include <linux/input/kxtj9.h>
	26	#include <linux/input-polldev.h>
	27
	28	#define NAME "kxtj9"
	29	#define G_MAX 8000
	30	/* OUTPUT REGISTERS */
	31	#define XOUT_L 0x06
	32	#define WHO_AM_I 0x0F
	33	/* CONTROL REGISTERS */
	34	#define INT_REL 0x1A
	35	#define CTRL_REG1 0x1B
	36	#define INT_CTRL1 0x1E
	37	#define DATA_CTRL 0x21
	38	/* CONTROL REGISTER 1 BITS */
	39	#define PC1_OFF 0x7F
	40	#define PC1_ON (1 << 7)
	41	/* Data ready funtion enable bit: set during probe if using irq mode */
	42	#define DRDYE (1 << 5)
	43	/* INTERRUPT CONTROL REGISTER 1 BITS */
	44	/* Set these during probe if using irq mode */
	45	#define KXTJ9_IEL (1 << 3)
	46	#define KXTJ9_IEA (1 << 4)
	47	#define KXTJ9_IEN (1 << 5)
	48	/* INPUT_ABS CONSTANTS */
	49	#define FUZZ 3
	50	#define FLAT 3
	51	/* RESUME STATE INDICES */
	52	#define RES_DATA_CTRL 0
	53	#define RES_CTRL_REG1 1
	54	#define RES_INT_CTRL1 2
	55	#define RESUME_ENTRIES 3
	56
	57	/*
	58	* The following table lists the maximum appropriate poll interval for each
	59	* available output data rate.
	60	*/
	61	static const struct {
	62	unsigned int cutoff;
	63	u8 mask;
	64	} kxtj9_odr_table[] = {
65	{ 3, ODR800F },
66	{ 5, ODR400F },
67	{ 10, ODR200F },
68	{ 20, ODR100F },
69	{ 40, ODR50F },
70	{ 80, ODR25F },
71	{ 0, ODR12_5F},
72	};
73
74	struct kxtj9_data {
75	struct i2c_client *client;
76	struct kxtj9_platform_data pdata;
77	struct input_dev *input_dev;
78	#ifdef CONFIG_INPUT_KXTJ9_POLLED_MODE
79	struct input_polled_dev *poll_dev;
80	#endif
81	unsigned int last_poll_interval;
82	u8 shift;
83	u8 ctrl_reg1;
84	u8 data_ctrl;
85	u8 int_ctrl;
86	};
87
88	static int kxtj9_i2c_read(struct kxtj9_data tj9, u8 addr, u8 data, int len)
89	{
90	struct i2c_msg msgs[] = {
91	{
92	.addr = tj9->client->addr,
93	.flags = tj9->client->flags,
94	.len = 1,
95	.buf = &addr,
96	},
97	{
98	.addr = tj9->client->addr,
99	.flags = tj9->client->flags \| I2C_M_RD,
100	.len = len,
101	.buf = data,
102	},
103	};
104
105	return i2c_transfer(tj9->client->adapter, msgs, 2);
106	}
107
108	static void kxtj9_report_acceleration_data(struct kxtj9_data *tj9)
109	{
110	s16 acc_data[3]; /* Data bytes from hardware xL, xH, yL, yH, zL, zH */
111	s16 x, y, z;
112	int err;
113
114	err = kxtj9_i2c_read(tj9, XOUT_L, (u8 *)acc_data, 6);
115	if (err < 0)
116	dev_err(&tj9->client->dev, "accelerometer data read failed\n");
117
118	x = le16_to_cpu(acc_data[tj9->pdata.axis_map_x]) >> tj9->shift;
119	y = le16_to_cpu(acc_data[tj9->pdata.axis_map_y]) >> tj9->shift;
120	z = le16_to_cpu(acc_data[tj9->pdata.axis_map_z]) >> tj9->shift;
121
122	input_report_abs(tj9->input_dev, ABS_X, tj9->pdata.negate_x ? -x : x);
123	input_report_abs(tj9->input_dev, ABS_Y, tj9->pdata.negate_y ? -y : y);
124	input_report_abs(tj9->input_dev, ABS_Z, tj9->pdata.negate_z ? -z : z);
125	input_sync(tj9->input_dev);
126	}
127
128	static irqreturn_t kxtj9_isr(int irq, void *dev)
129	{
130	struct kxtj9_data *tj9 = dev;
131	int err;
132
133	/* data ready is the only possible interrupt type */
134	kxtj9_report_acceleration_data(tj9);
135
136	err = i2c_smbus_read_byte_data(tj9->client, INT_REL);
137	if (err < 0)
138	dev_err(&tj9->client->dev,
139	"error clearing interrupt status: %d\n", err);
140
141	return IRQ_HANDLED;
142	}
143
144	static int kxtj9_update_g_range(struct kxtj9_data *tj9, u8 new_g_range)
145	{
146	switch (new_g_range) {
147	case KXTJ9_G_2G:
148	tj9->shift = 4;
149	break;
150	case KXTJ9_G_4G:
151	tj9->shift = 3;
152	break;
153	case KXTJ9_G_8G:
154	tj9->shift = 2;
155	break;
156	default:
157	return -EINVAL;
158	}
159
160	tj9->ctrl_reg1 &= 0xe7;
161	tj9->ctrl_reg1 \|= new_g_range;
162
163	return 0;
164	}
165
166	static int kxtj9_update_odr(struct kxtj9_data *tj9, unsigned int poll_interval)
167	{
168	int err;
169	int i;
170
171	/* Use the lowest ODR that can support the requested poll interval */
172	for (i = 0; i < ARRAY_SIZE(kxtj9_odr_table); i++) {
173	tj9->data_ctrl = kxtj9_odr_table[i].mask;
174	if (poll_interval < kxtj9_odr_table[i].cutoff)
175	break;
176	}
177
178	err = i2c_smbus_write_byte_data(tj9->client, CTRL_REG1, 0);
179	if (err < 0)
180	return err;
181
182	err = i2c_smbus_write_byte_data(tj9->client, DATA_CTRL, tj9->data_ctrl);
183	if (err < 0)
184	return err;
185
186	err = i2c_smbus_write_byte_data(tj9->client, CTRL_REG1, tj9->ctrl_reg1);
187	if (err < 0)
188	return err;
189
190	return 0;
191	}
192
193	static int kxtj9_device_power_on(struct kxtj9_data *tj9)
194	{
195	if (tj9->pdata.power_on)
196	return tj9->pdata.power_on();
197
198	return 0;
199	}
200
201	static void kxtj9_device_power_off(struct kxtj9_data *tj9)
202	{
203	int err;
204
205	tj9->ctrl_reg1 &= PC1_OFF;
206	err = i2c_smbus_write_byte_data(tj9->client, CTRL_REG1, tj9->ctrl_reg1);
207	if (err < 0)
208	dev_err(&tj9->client->dev, "soft power off failed\n");
209
210	if (tj9->pdata.power_off)
211	tj9->pdata.power_off();
212	}
213
214	static int kxtj9_enable(struct kxtj9_data *tj9)
215	{
216	int err;
217
218	err = kxtj9_device_power_on(tj9);
219	if (err < 0)
220	return err;
221
222	/* ensure that PC1 is cleared before updating control registers */
223	err = i2c_smbus_write_byte_data(tj9->client, CTRL_REG1, 0);
224	if (err < 0)
225	return err;
226
227	/* only write INT_CTRL_REG1 if in irq mode */
228	if (tj9->client->irq) {
229	err = i2c_smbus_write_byte_data(tj9->client,
230	INT_CTRL1, tj9->int_ctrl);
231	if (err < 0)
232	return err;
233	}
234
235	err = kxtj9_update_g_range(tj9, tj9->pdata.g_range);
236	if (err < 0)
237	return err;
238
239	/* turn on outputs */
240	tj9->ctrl_reg1 \|= PC1_ON;
241	err = i2c_smbus_write_byte_data(tj9->client, CTRL_REG1, tj9->ctrl_reg1);
242	if (err < 0)
243	return err;
244
245	err = kxtj9_update_odr(tj9, tj9->last_poll_interval);
246	if (err < 0)
247	return err;
248
249	/* clear initial interrupt if in irq mode */
250	if (tj9->client->irq) {
251	err = i2c_smbus_read_byte_data(tj9->client, INT_REL);
252	if (err < 0) {
253	dev_err(&tj9->client->dev,
254	"error clearing interrupt: %d\n", err);
255	goto fail;
256	}
257	}
258
259	return 0;
260
261	fail:
262	kxtj9_device_power_off(tj9);
263	return err;
264	}
265
266	static void kxtj9_disable(struct kxtj9_data *tj9)
267	{
268	kxtj9_device_power_off(tj9);
269	}
270
271	static int kxtj9_input_open(struct input_dev *input)
272	{
273	struct kxtj9_data *tj9 = input_get_drvdata(input);
274
275	return kxtj9_enable(tj9);
276	}
277
278	static void kxtj9_input_close(struct input_dev *dev)
279	{
280	struct kxtj9_data *tj9 = input_get_drvdata(dev);
281
282	kxtj9_disable(tj9);
283	}
284
285	static void __devinit kxtj9_init_input_device(struct kxtj9_data *tj9,
286	struct input_dev *input_dev)
287	{
288	__set_bit(EV_ABS, input_dev->evbit);
289	input_set_abs_params(input_dev, ABS_X, -G_MAX, G_MAX, FUZZ, FLAT);
290	input_set_abs_params(input_dev, ABS_Y, -G_MAX, G_MAX, FUZZ, FLAT);
291	input_set_abs_params(input_dev, ABS_Z, -G_MAX, G_MAX, FUZZ, FLAT);
292
293	input_dev->name = "kxtj9_accel";
294	input_dev->id.bustype = BUS_I2C;
295	input_dev->dev.parent = &tj9->client->dev;
296	}
297
298	static int __devinit kxtj9_setup_input_device(struct kxtj9_data *tj9)
299	{
300	struct input_dev *input_dev;
301	int err;
302
303	input_dev = input_allocate_device();
304	if (!tj9->input_dev) {
305	dev_err(&tj9->client->dev, "input device allocate failed\n");
306	return -ENOMEM;
307	}
308
309	tj9->input_dev = input_dev;
310
311	input_dev->open = kxtj9_input_open;
312	input_dev->close = kxtj9_input_close;
313	input_set_drvdata(input_dev, tj9);
314
315	kxtj9_init_input_device(tj9, input_dev);
316
317	err = input_register_device(tj9->input_dev);
318	if (err) {
319	dev_err(&tj9->client->dev,
320	"unable to register input polled device %s: %d\n",
321	tj9->input_dev->name, err);
322	input_free_device(tj9->input_dev);
323	return err;
324	}
325
326	return 0;
327	}
328
329	/*
330	* When IRQ mode is selected, we need to provide an interface to allow the user
331	* to change the output data rate of the part. For consistency, we are using
332	* the set_poll method, which accepts a poll interval in milliseconds, and then
333	* calls update_odr() while passing this value as an argument. In IRQ mode, the
334	* data outputs will not be read AT the requested poll interval, rather, the
335	* lowest ODR that can support the requested interval. The client application
336	* will be responsible for retrieving data from the input node at the desired
337	* interval.
338	*/
339
340	/* Returns currently selected poll interval (in ms) */
341	static ssize_t kxtj9_get_poll(struct device *dev,
342	struct device_attribute attr, char buf)
343	{
344	struct i2c_client *client = to_i2c_client(dev);
345	struct kxtj9_data *tj9 = i2c_get_clientdata(client);
346
347	return sprintf(buf, "%d\n", tj9->last_poll_interval);
348	}
349
350	/* Allow users to select a new poll interval (in ms) */
351	static ssize_t kxtj9_set_poll(struct device dev, struct device_attribute attr,
352	const char *buf, size_t count)
353	{
354	struct i2c_client *client = to_i2c_client(dev);
355	struct kxtj9_data *tj9 = i2c_get_clientdata(client);
356	struct input_dev *input_dev = tj9->input_dev;
357	unsigned int interval;
358	int error;
359
360	error = kstrtouint(buf, 10, &interval);
361	if (error < 0)
362	return error;
363
364	/* Lock the device to prevent races with open/close (and itself) */
365	mutex_unlock(&input_dev->mutex);
366
367	disable_irq(client->irq);
368
369	/*
370	* Set current interval to the greater of the minimum interval or
371	* the requested interval
372	*/
373	tj9->last_poll_interval = max(interval, tj9->pdata.min_interval);
374
375	kxtj9_update_odr(tj9, tj9->last_poll_interval);
376
377	enable_irq(client->irq);
378	mutex_unlock(&input_dev->mutex);
379
380	return count;
381	}
382
383	static DEVICE_ATTR(poll, S_IRUGO\|S_IWUSR, kxtj9_get_poll, kxtj9_set_poll);
384
385	static struct attribute *kxtj9_attributes[] = {
386	&dev_attr_poll.attr,
387	NULL
388	};
389
390	static struct attribute_group kxtj9_attribute_group = {
391	.attrs = kxtj9_attributes
392	};
393
394
395	#ifdef CONFIG_INPUT_KXTJ9_POLLED_MODE
396	static void kxtj9_poll(struct input_polled_dev *dev)
397	{
398	struct kxtj9_data *tj9 = dev->private;
399	unsigned int poll_interval = dev->poll_interval;
400
401	kxtj9_report_acceleration_data(tj9);
402
403	if (poll_interval != tj9->last_poll_interval) {
404	kxtj9_update_odr(tj9, poll_interval);
405	tj9->last_poll_interval = poll_interval;
406	}
407	}
408
409	static void kxtj9_polled_input_open(struct input_polled_dev *dev)
410	{
411	struct kxtj9_data *tj9 = dev->private;
412
413	kxtj9_enable(tj9);
414	}
415
416	static void kxtj9_polled_input_close(struct input_polled_dev *dev)
417	{
418	struct kxtj9_data *tj9 = dev->private;
419
420	kxtj9_disable(tj9);
421	}
422
423	static int __devinit kxtj9_setup_polled_device(struct kxtj9_data *tj9)
424	{
425	int err;
426	struct input_polled_dev *poll_dev;
427	poll_dev = input_allocate_polled_device();
428
429	if (!poll_dev) {
430	dev_err(&tj9->client->dev,
431	"Failed to allocate polled device\n");
432	return -ENOMEM;
433	}
434
435	tj9->poll_dev = poll_dev;
436	tj9->input_dev = poll_dev->input;
437
438	poll_dev->private = tj9;
439	poll_dev->poll = kxtj9_poll;
440	poll_dev->open = kxtj9_polled_input_open;
441	poll_dev->close = kxtj9_polled_input_close;
442
443	kxtj9_init_input_device(tj9, poll_dev->input);
444
445	err = input_register_polled_device(poll_dev);
446	if (err) {
447	dev_err(&tj9->client->dev,
448	"Unable to register polled device, err=%d\n", err);
449	input_free_polled_device(poll_dev);
450	return err;
451	}
452
453	return 0;
454	}
455
456	static void __devexit kxtj9_teardown_polled_device(struct kxtj9_data *tj9)
457	{
458	input_unregister_polled_device(tj9->poll_dev);
459	input_free_polled_device(tj9->poll_dev);
460	}
461
462	#else
463
464	static inline int kxtj9_setup_polled_device(struct kxtj9_data *tj9)
465	{
466	return -ENOSYS;
467	}
468
469	static inline void kxtj9_teardown_polled_device(struct kxtj9_data *tj9)
470	{
471	}
472
473	#endif
474
475	static int __devinit kxtj9_verify(struct kxtj9_data *tj9)
476	{
477	int retval;
478
479	retval = kxtj9_device_power_on(tj9);
480	if (retval < 0)
481	return retval;
482
483	retval = i2c_smbus_read_byte_data(tj9->client, WHO_AM_I);
484	if (retval < 0) {
485	dev_err(&tj9->client->dev, "read err int source\n");
486	goto out;
487	}
488
489	retval = retval != 0x06 ? -EIO : 0;
490
491	out:
492	kxtj9_device_power_off(tj9);
493	return retval;
494	}
495
496	static int __devinit kxtj9_probe(struct i2c_client *client,
497	const struct i2c_device_id *id)
498	{
499	const struct kxtj9_platform_data *pdata = client->dev.platform_data;
500	struct kxtj9_data *tj9;
501	int err;
502
503	if (!i2c_check_functionality(client->adapter,
504	I2C_FUNC_I2C \| I2C_FUNC_SMBUS_BYTE_DATA)) {
505	dev_err(&client->dev, "client is not i2c capable\n");
506	return -ENXIO;
507	}
508
509	if (!pdata) {
510	dev_err(&client->dev, "platform data is NULL; exiting\n");
511	return -EINVAL;
512	}
513
514	tj9 = kzalloc(sizeof(*tj9), GFP_KERNEL);
515	if (!tj9) {
516	dev_err(&client->dev,
517	"failed to allocate memory for module data\n");
518	return -ENOMEM;
519	}
520
521	tj9->client = client;
522	tj9->pdata = *pdata;
523
524	if (pdata->init) {
525	err = pdata->init();
526	if (err < 0)
527	goto err_free_mem;
528	}
529
530	err = kxtj9_verify(tj9);
531	if (err < 0) {
532	dev_err(&client->dev, "device not recognized\n");
533	goto err_pdata_exit;
534	}
535
536	i2c_set_clientdata(client, tj9);
537
538	tj9->ctrl_reg1 = tj9->pdata.res_12bit \| tj9->pdata.g_range;
539	tj9->data_ctrl = tj9->pdata.data_odr_init;
540
541	if (client->irq) {
542	/* If in irq mode, populate INT_CTRL_REG1 and enable DRDY. */
543	tj9->int_ctrl \|= KXTJ9_IEN \| KXTJ9_IEA \| KXTJ9_IEL;
544	tj9->ctrl_reg1 \|= DRDYE;
545
546	err = kxtj9_setup_input_device(tj9);
547	if (err)
548	goto err_pdata_exit;
549
550	err = request_threaded_irq(client->irq, NULL, kxtj9_isr,
551	IRQF_TRIGGER_RISING \| IRQF_ONESHOT,
552	"kxtj9-irq", tj9);
553	if (err) {
554	dev_err(&client->dev, "request irq failed: %d\n", err);
555	goto err_destroy_input;
556	}
557
558	err = sysfs_create_group(&client->dev.kobj, &kxtj9_attribute_group);
559	if (err) {
560	dev_err(&client->dev, "sysfs create failed: %d\n", err);
561	goto err_free_irq;
562	}
563
564	} else {
565	err = kxtj9_setup_polled_device(tj9);
566	if (err)
567	goto err_pdata_exit;
568	}
569
570	return 0;
571
572	err_free_irq:
573	free_irq(client->irq, tj9);
574	err_destroy_input:
575	input_unregister_device(tj9->input_dev);
576	err_pdata_exit:
577	if (tj9->pdata.exit)
578	tj9->pdata.exit();
579	err_free_mem:
580	kfree(tj9);
581	return err;
582	}
583
584	static int __devexit kxtj9_remove(struct i2c_client *client)
585	{
586	struct kxtj9_data *tj9 = i2c_get_clientdata(client);
587
588	if (client->irq) {
589	sysfs_remove_group(&client->dev.kobj, &kxtj9_attribute_group);
590	free_irq(client->irq, tj9);
591	input_unregister_device(tj9->input_dev);
592	} else {
593	kxtj9_teardown_polled_device(tj9);
594	}
595
596	if (tj9->pdata.exit)
597	tj9->pdata.exit();
598
599	kfree(tj9);
600
601	return 0;
602	}
603
604	#ifdef CONFIG_PM_SLEEP
605	static int kxtj9_suspend(struct device *dev)
606	{
607	struct i2c_client *client = to_i2c_client(dev);
608	struct kxtj9_data *tj9 = i2c_get_clientdata(client);
609	struct input_dev *input_dev = tj9->input_dev;
610
611	mutex_lock(&input_dev->mutex);
612
613	if (input_dev->users)
614	kxtj9_disable(tj9);
615
616	mutex_unlock(&input_dev->mutex);
617	return 0;
618	}
619
620	static int kxtj9_resume(struct device *dev)
621	{
622	struct i2c_client *client = to_i2c_client(dev);
623	struct kxtj9_data *tj9 = i2c_get_clientdata(client);
624	struct input_dev *input_dev = tj9->input_dev;
625	int retval = 0;
626
627	mutex_lock(&input_dev->mutex);
628
629	if (input_dev->users)
630	kxtj9_enable(tj9);
631
632	mutex_unlock(&input_dev->mutex);
633	return retval;
634	}
635	#endif
636
637	static SIMPLE_DEV_PM_OPS(kxtj9_pm_ops, kxtj9_suspend, kxtj9_resume);
638
639	static const struct i2c_device_id kxtj9_id[] = {
640	{ NAME, 0 },
641	{ },
642	};
643
644	MODULE_DEVICE_TABLE(i2c, kxtj9_id);
645
646	static struct i2c_driver kxtj9_driver = {
647	.driver = {
648	.name = NAME,
649	.owner = THIS_MODULE,
650	.pm = &kxtj9_pm_ops,
651	},
652	.probe = kxtj9_probe,
653	.remove = __devexit_p(kxtj9_remove),
654	.id_table = kxtj9_id,
655	};
656
657	static int __init kxtj9_init(void)
658	{
659	return i2c_add_driver(&kxtj9_driver);
660	}
661	module_init(kxtj9_init);
662
663	static void __exit kxtj9_exit(void)
664	{
665	i2c_del_driver(&kxtj9_driver);
666	}
667	module_exit(kxtj9_exit);
668
669	MODULE_DESCRIPTION("KXTJ9 accelerometer driver");
670	MODULE_AUTHOR("Chris Hudson <chudson@kionix.com>");
671	MODULE_LICENSE("GPL");