[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/module.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)
/* DATA CONTROL REGISTER BITS */
#define ODR12_5F		0
#define ODR25F			1
#define ODR50F			2
#define ODR100F		3
#define ODR200F		4
#define ODR400F		5
#define ODR800F		6
/* 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]);
	y = le16_to_cpu(acc_data[tj9->pdata.axis_map_y]);
	z = le16_to_cpu(acc_data[tj9->pdata.axis_map_z]);

	x >>= tj9->shift;
	y >>= tj9->shift;
	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 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 kxtj9_setup_input_device(struct kxtj9_data *tj9)
{
	struct input_dev *input_dev;
	int err;

	input_dev = input_allocate_device();
	if (!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_lock(&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 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 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 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 != 0x07 && retval != 0x08) ? -EIO : 0;

out:
	kxtj9_device_power_off(tj9);
	return retval;
}

static int kxtj9_probe(struct i2c_client *client,
				 const struct i2c_device_id *id)
{
	const struct kxtj9_platform_data *pdata =
			dev_get_platdata(&client->dev);
	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->last_poll_interval = tj9->pdata.init_interval;

	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 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;
}

static int __maybe_unused 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 __maybe_unused 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;

	mutex_lock(&input_dev->mutex);

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

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

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,
		.pm	= &kxtj9_pm_ops,
	},
	.probe		= kxtj9_probe,
	.remove		= kxtj9_remove,
	.id_table	= kxtj9_id,
};

module_i2c_driver(kxtj9_driver);

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>
2501ec97	24	#include <linux/module.h>
e8e70d83 CH	25	#include <linux/slab.h>
	26	#include <linux/input/kxtj9.h>
	27	#include <linux/input-polldev.h>
	28
	29	#define NAME "kxtj9"
	30	#define G_MAX 8000
	31	/* OUTPUT REGISTERS */
	32	#define XOUT_L 0x06
	33	#define WHO_AM_I 0x0F
	34	/* CONTROL REGISTERS */
	35	#define INT_REL 0x1A
	36	#define CTRL_REG1 0x1B
	37	#define INT_CTRL1 0x1E
	38	#define DATA_CTRL 0x21
	39	/* CONTROL REGISTER 1 BITS */
	40	#define PC1_OFF 0x7F
	41	#define PC1_ON (1 << 7)
	42	/* Data ready funtion enable bit: set during probe if using irq mode */
	43	#define DRDYE (1 << 5)
04391660 CH	44	/* DATA CONTROL REGISTER BITS */
	45	#define ODR12_5F 0
	46	#define ODR25F 1
	47	#define ODR50F 2
	48	#define ODR100F 3
	49	#define ODR200F 4
	50	#define ODR400F 5
	51	#define ODR800F 6
e8e70d83 CH	52	/* INTERRUPT CONTROL REGISTER 1 BITS */
	53	/* Set these during probe if using irq mode */
	54	#define KXTJ9_IEL (1 << 3)
	55	#define KXTJ9_IEA (1 << 4)
	56	#define KXTJ9_IEN (1 << 5)
	57	/* INPUT_ABS CONSTANTS */
	58	#define FUZZ 3
	59	#define FLAT 3
	60	/* RESUME STATE INDICES */
	61	#define RES_DATA_CTRL 0
	62	#define RES_CTRL_REG1 1
	63	#define RES_INT_CTRL1 2
	64	#define RESUME_ENTRIES 3
	65
	66	/*
	67	* The following table lists the maximum appropriate poll interval for each
	68	* available output data rate.
	69	*/
	70	static const struct {
	71	unsigned int cutoff;
	72	u8 mask;
	73	} kxtj9_odr_table[] = {
	74	{ 3, ODR800F },
	75	{ 5, ODR400F },
	76	{ 10, ODR200F },
	77	{ 20, ODR100F },
	78	{ 40, ODR50F },
	79	{ 80, ODR25F },
	80	{ 0, ODR12_5F},
	81	};
	82
	83	struct kxtj9_data {
	84	struct i2c_client *client;
	85	struct kxtj9_platform_data pdata;
	86	struct input_dev *input_dev;
	87	#ifdef CONFIG_INPUT_KXTJ9_POLLED_MODE
	88	struct input_polled_dev *poll_dev;
	89	#endif
	90	unsigned int last_poll_interval;
	91	u8 shift;
	92	u8 ctrl_reg1;
	93	u8 data_ctrl;
	94	u8 int_ctrl;
	95	};
	96
	97	static int kxtj9_i2c_read(struct kxtj9_data tj9, u8 addr, u8 data, int len)
	98	{
	99	struct i2c_msg msgs[] = {
	100	{
	101	.addr = tj9->client->addr,
	102	.flags = tj9->client->flags,
	103	.len = 1,
	104	.buf = &addr,
	105	},
	106	{
	107	.addr = tj9->client->addr,
	108	.flags = tj9->client->flags \| I2C_M_RD,
	109	.len = len,
	110	.buf = data,
	111	},
	112	};
	113
	114	return i2c_transfer(tj9->client->adapter, msgs, 2);
	115	}
116
117	static void kxtj9_report_acceleration_data(struct kxtj9_data *tj9)
118	{
119	s16 acc_data[3]; /* Data bytes from hardware xL, xH, yL, yH, zL, zH */
120	s16 x, y, z;
121	int err;
122
123	err = kxtj9_i2c_read(tj9, XOUT_L, (u8 *)acc_data, 6);
124	if (err < 0)
125	dev_err(&tj9->client->dev, "accelerometer data read failed\n");
126
04391660 CH	127	x = le16_to_cpu(acc_data[tj9->pdata.axis_map_x]);
	128	y = le16_to_cpu(acc_data[tj9->pdata.axis_map_y]);
	129	z = le16_to_cpu(acc_data[tj9->pdata.axis_map_z]);
	130
	131	x >>= tj9->shift;
	132	y >>= tj9->shift;
	133	z >>= tj9->shift;
e8e70d83 CH	134
	135	input_report_abs(tj9->input_dev, ABS_X, tj9->pdata.negate_x ? -x : x);
	136	input_report_abs(tj9->input_dev, ABS_Y, tj9->pdata.negate_y ? -y : y);
	137	input_report_abs(tj9->input_dev, ABS_Z, tj9->pdata.negate_z ? -z : z);
	138	input_sync(tj9->input_dev);
	139	}
	140
	141	static irqreturn_t kxtj9_isr(int irq, void *dev)
	142	{
	143	struct kxtj9_data *tj9 = dev;
	144	int err;
	145
	146	/* data ready is the only possible interrupt type */
	147	kxtj9_report_acceleration_data(tj9);
	148
	149	err = i2c_smbus_read_byte_data(tj9->client, INT_REL);
	150	if (err < 0)
	151	dev_err(&tj9->client->dev,
	152	"error clearing interrupt status: %d\n", err);
	153
	154	return IRQ_HANDLED;
	155	}
	156
	157	static int kxtj9_update_g_range(struct kxtj9_data *tj9, u8 new_g_range)
	158	{
	159	switch (new_g_range) {
	160	case KXTJ9_G_2G:
	161	tj9->shift = 4;
	162	break;
	163	case KXTJ9_G_4G:
	164	tj9->shift = 3;
	165	break;
	166	case KXTJ9_G_8G:
	167	tj9->shift = 2;
	168	break;
	169	default:
	170	return -EINVAL;
	171	}
	172
	173	tj9->ctrl_reg1 &= 0xe7;
	174	tj9->ctrl_reg1 \|= new_g_range;
	175
	176	return 0;
	177	}
	178
	179	static int kxtj9_update_odr(struct kxtj9_data *tj9, unsigned int poll_interval)
	180	{
	181	int err;
	182	int i;
	183
	184	/* Use the lowest ODR that can support the requested poll interval */
	185	for (i = 0; i < ARRAY_SIZE(kxtj9_odr_table); i++) {
	186	tj9->data_ctrl = kxtj9_odr_table[i].mask;
	187	if (poll_interval < kxtj9_odr_table[i].cutoff)
	188	break;
	189	}
	190
	191	err = i2c_smbus_write_byte_data(tj9->client, CTRL_REG1, 0);
	192	if (err < 0)
	193	return err;
	194
	195	err = i2c_smbus_write_byte_data(tj9->client, DATA_CTRL, tj9->data_ctrl);
	196	if (err < 0)
	197	return err;
198
199	err = i2c_smbus_write_byte_data(tj9->client, CTRL_REG1, tj9->ctrl_reg1);
200	if (err < 0)
201	return err;
202
203	return 0;
204	}
205
206	static int kxtj9_device_power_on(struct kxtj9_data *tj9)
207	{
208	if (tj9->pdata.power_on)
209	return tj9->pdata.power_on();
210
211	return 0;
212	}
213
214	static void kxtj9_device_power_off(struct kxtj9_data *tj9)
215	{
216	int err;
217
218	tj9->ctrl_reg1 &= PC1_OFF;
219	err = i2c_smbus_write_byte_data(tj9->client, CTRL_REG1, tj9->ctrl_reg1);
220	if (err < 0)
221	dev_err(&tj9->client->dev, "soft power off failed\n");
222
223	if (tj9->pdata.power_off)
224	tj9->pdata.power_off();
225	}
226
227	static int kxtj9_enable(struct kxtj9_data *tj9)
228	{
229	int err;
230
231	err = kxtj9_device_power_on(tj9);
232	if (err < 0)
233	return err;
234
235	/* ensure that PC1 is cleared before updating control registers */
236	err = i2c_smbus_write_byte_data(tj9->client, CTRL_REG1, 0);
237	if (err < 0)
238	return err;
239
240	/* only write INT_CTRL_REG1 if in irq mode */
241	if (tj9->client->irq) {
242	err = i2c_smbus_write_byte_data(tj9->client,
243	INT_CTRL1, tj9->int_ctrl);
244	if (err < 0)
245	return err;
246	}
247
248	err = kxtj9_update_g_range(tj9, tj9->pdata.g_range);
249	if (err < 0)
250	return err;
251
252	/* turn on outputs */
253	tj9->ctrl_reg1 \|= PC1_ON;
254	err = i2c_smbus_write_byte_data(tj9->client, CTRL_REG1, tj9->ctrl_reg1);
255	if (err < 0)
256	return err;
257
258	err = kxtj9_update_odr(tj9, tj9->last_poll_interval);
259	if (err < 0)
260	return err;
261
262	/* clear initial interrupt if in irq mode */
263	if (tj9->client->irq) {
264	err = i2c_smbus_read_byte_data(tj9->client, INT_REL);
265	if (err < 0) {
266	dev_err(&tj9->client->dev,
267	"error clearing interrupt: %d\n", err);
268	goto fail;
269	}
270	}
271
272	return 0;
273
274	fail:
275	kxtj9_device_power_off(tj9);
276	return err;
277	}
278
279	static void kxtj9_disable(struct kxtj9_data *tj9)
280	{
281	kxtj9_device_power_off(tj9);
282	}
283
284	static int kxtj9_input_open(struct input_dev *input)
285	{
286	struct kxtj9_data *tj9 = input_get_drvdata(input);
287
288	return kxtj9_enable(tj9);
289	}
290
291	static void kxtj9_input_close(struct input_dev *dev)
292	{
293	struct kxtj9_data *tj9 = input_get_drvdata(dev);
294
295	kxtj9_disable(tj9);
296	}
297
5298cc4c	298	static void kxtj9_init_input_device(struct kxtj9_data *tj9,
e8e70d83 CH	299	struct input_dev *input_dev)
	300	{
	301	__set_bit(EV_ABS, input_dev->evbit);
	302	input_set_abs_params(input_dev, ABS_X, -G_MAX, G_MAX, FUZZ, FLAT);
	303	input_set_abs_params(input_dev, ABS_Y, -G_MAX, G_MAX, FUZZ, FLAT);
	304	input_set_abs_params(input_dev, ABS_Z, -G_MAX, G_MAX, FUZZ, FLAT);
	305
	306	input_dev->name = "kxtj9_accel";
	307	input_dev->id.bustype = BUS_I2C;
	308	input_dev->dev.parent = &tj9->client->dev;
	309	}
	310
5298cc4c	311	static int kxtj9_setup_input_device(struct kxtj9_data *tj9)
e8e70d83 CH	312	{
	313	struct input_dev *input_dev;
	314	int err;
	315
	316	input_dev = input_allocate_device();
4fd9fcf7	317	if (!input_dev) {
e8e70d83 CH	318	dev_err(&tj9->client->dev, "input device allocate failed\n");
	319	return -ENOMEM;
	320	}
	321
	322	tj9->input_dev = input_dev;
	323
	324	input_dev->open = kxtj9_input_open;
	325	input_dev->close = kxtj9_input_close;
	326	input_set_drvdata(input_dev, tj9);
	327
	328	kxtj9_init_input_device(tj9, input_dev);
	329
	330	err = input_register_device(tj9->input_dev);
	331	if (err) {
	332	dev_err(&tj9->client->dev,
	333	"unable to register input polled device %s: %d\n",
	334	tj9->input_dev->name, err);
	335	input_free_device(tj9->input_dev);
	336	return err;
	337	}
	338
	339	return 0;
	340	}
	341
	342	/*
	343	* When IRQ mode is selected, we need to provide an interface to allow the user
	344	* to change the output data rate of the part. For consistency, we are using
	345	* the set_poll method, which accepts a poll interval in milliseconds, and then
	346	* calls update_odr() while passing this value as an argument. In IRQ mode, the
	347	* data outputs will not be read AT the requested poll interval, rather, the
	348	* lowest ODR that can support the requested interval. The client application
	349	* will be responsible for retrieving data from the input node at the desired
	350	* interval.
	351	*/
	352
	353	/* Returns currently selected poll interval (in ms) */
	354	static ssize_t kxtj9_get_poll(struct device *dev,
	355	struct device_attribute attr, char buf)
	356	{
	357	struct i2c_client *client = to_i2c_client(dev);
	358	struct kxtj9_data *tj9 = i2c_get_clientdata(client);
	359
	360	return sprintf(buf, "%d\n", tj9->last_poll_interval);
	361	}
	362
	363	/* Allow users to select a new poll interval (in ms) */
	364	static ssize_t kxtj9_set_poll(struct device dev, struct device_attribute attr,
	365	const char *buf, size_t count)
	366	{
	367	struct i2c_client *client = to_i2c_client(dev);
	368	struct kxtj9_data *tj9 = i2c_get_clientdata(client);
	369	struct input_dev *input_dev = tj9->input_dev;
	370	unsigned int interval;
	371	int error;
	372
	373	error = kstrtouint(buf, 10, &interval);
	374	if (error < 0)
	375	return error;
	376
	377	/* Lock the device to prevent races with open/close (and itself) */
6eab7ce6	378	mutex_lock(&input_dev->mutex);
e8e70d83 CH	379
	380	disable_irq(client->irq);
	381
	382	/*
	383	* Set current interval to the greater of the minimum interval or
	384	* the requested interval
	385	*/
	386	tj9->last_poll_interval = max(interval, tj9->pdata.min_interval);
	387
	388	kxtj9_update_odr(tj9, tj9->last_poll_interval);
	389
	390	enable_irq(client->irq);
	391	mutex_unlock(&input_dev->mutex);
	392
	393	return count;
	394	}
	395
	396	static DEVICE_ATTR(poll, S_IRUGO\|S_IWUSR, kxtj9_get_poll, kxtj9_set_poll);
	397
	398	static struct attribute *kxtj9_attributes[] = {
	399	&dev_attr_poll.attr,
	400	NULL
	401	};
	402
	403	static struct attribute_group kxtj9_attribute_group = {
	404	.attrs = kxtj9_attributes
	405	};
	406
	407
	408	#ifdef CONFIG_INPUT_KXTJ9_POLLED_MODE
	409	static void kxtj9_poll(struct input_polled_dev *dev)
	410	{
	411	struct kxtj9_data *tj9 = dev->private;
	412	unsigned int poll_interval = dev->poll_interval;
	413
	414	kxtj9_report_acceleration_data(tj9);
	415
	416	if (poll_interval != tj9->last_poll_interval) {
	417	kxtj9_update_odr(tj9, poll_interval);
	418	tj9->last_poll_interval = poll_interval;
	419	}
	420	}
	421
	422	static void kxtj9_polled_input_open(struct input_polled_dev *dev)
	423	{
	424	struct kxtj9_data *tj9 = dev->private;
	425
	426	kxtj9_enable(tj9);
	427	}
	428
	429	static void kxtj9_polled_input_close(struct input_polled_dev *dev)
	430	{
	431	struct kxtj9_data *tj9 = dev->private;
	432
	433	kxtj9_disable(tj9);
	434	}
	435
5298cc4c	436	static int kxtj9_setup_polled_device(struct kxtj9_data *tj9)
e8e70d83 CH	437	{
	438	int err;
	439	struct input_polled_dev *poll_dev;
	440	poll_dev = input_allocate_polled_device();
	441
	442	if (!poll_dev) {
	443	dev_err(&tj9->client->dev,
	444	"Failed to allocate polled device\n");
	445	return -ENOMEM;
	446	}
	447
	448	tj9->poll_dev = poll_dev;
	449	tj9->input_dev = poll_dev->input;
	450
	451	poll_dev->private = tj9;
	452	poll_dev->poll = kxtj9_poll;
	453	poll_dev->open = kxtj9_polled_input_open;
	454	poll_dev->close = kxtj9_polled_input_close;
	455
	456	kxtj9_init_input_device(tj9, poll_dev->input);
	457
	458	err = input_register_polled_device(poll_dev);
	459	if (err) {
	460	dev_err(&tj9->client->dev,
	461	"Unable to register polled device, err=%d\n", err);
	462	input_free_polled_device(poll_dev);
	463	return err;
	464	}
	465
	466	return 0;
	467	}
	468
e2619cf7	469	static void kxtj9_teardown_polled_device(struct kxtj9_data *tj9)
e8e70d83 CH	470	{
	471	input_unregister_polled_device(tj9->poll_dev);
	472	input_free_polled_device(tj9->poll_dev);
	473	}
	474
	475	#else
	476
	477	static inline int kxtj9_setup_polled_device(struct kxtj9_data *tj9)
	478	{
	479	return -ENOSYS;
	480	}
	481
	482	static inline void kxtj9_teardown_polled_device(struct kxtj9_data *tj9)
	483	{
	484	}
	485
	486	#endif
	487
5298cc4c	488	static int kxtj9_verify(struct kxtj9_data *tj9)
e8e70d83 CH	489	{
	490	int retval;
	491
	492	retval = kxtj9_device_power_on(tj9);
	493	if (retval < 0)
	494	return retval;
	495
	496	retval = i2c_smbus_read_byte_data(tj9->client, WHO_AM_I);
	497	if (retval < 0) {
	498	dev_err(&tj9->client->dev, "read err int source\n");
	499	goto out;
	500	}
	501
04391660	502	retval = (retval != 0x07 && retval != 0x08) ? -EIO : 0;
e8e70d83 CH	503
	504	out:
	505	kxtj9_device_power_off(tj9);
	506	return retval;
	507	}
	508
5298cc4c	509	static int kxtj9_probe(struct i2c_client *client,
e8e70d83 CH	510	const struct i2c_device_id *id)
e8e70d83 CH	511	{
c838cb3d JH	512	const struct kxtj9_platform_data *pdata =
c838cb3d JH	513	dev_get_platdata(&client->dev);
e8e70d83 CH	514	struct kxtj9_data *tj9;
	515	int err;
	516
	517	if (!i2c_check_functionality(client->adapter,
	518	I2C_FUNC_I2C \| I2C_FUNC_SMBUS_BYTE_DATA)) {
	519	dev_err(&client->dev, "client is not i2c capable\n");
	520	return -ENXIO;
	521	}
	522
	523	if (!pdata) {
	524	dev_err(&client->dev, "platform data is NULL; exiting\n");
	525	return -EINVAL;
	526	}
	527
	528	tj9 = kzalloc(sizeof(*tj9), GFP_KERNEL);
	529	if (!tj9) {
	530	dev_err(&client->dev,
	531	"failed to allocate memory for module data\n");
	532	return -ENOMEM;
	533	}
	534
	535	tj9->client = client;
	536	tj9->pdata = *pdata;
	537
	538	if (pdata->init) {
	539	err = pdata->init();
	540	if (err < 0)
	541	goto err_free_mem;
	542	}
	543
	544	err = kxtj9_verify(tj9);
	545	if (err < 0) {
	546	dev_err(&client->dev, "device not recognized\n");
	547	goto err_pdata_exit;
	548	}
	549
	550	i2c_set_clientdata(client, tj9);
	551
	552	tj9->ctrl_reg1 = tj9->pdata.res_12bit \| tj9->pdata.g_range;
04391660	553	tj9->last_poll_interval = tj9->pdata.init_interval;
e8e70d83 CH	554
	555	if (client->irq) {
	556	/* If in irq mode, populate INT_CTRL_REG1 and enable DRDY. */
	557	tj9->int_ctrl \|= KXTJ9_IEN \| KXTJ9_IEA \| KXTJ9_IEL;
	558	tj9->ctrl_reg1 \|= DRDYE;
	559
	560	err = kxtj9_setup_input_device(tj9);
	561	if (err)
	562	goto err_pdata_exit;
	563
	564	err = request_threaded_irq(client->irq, NULL, kxtj9_isr,
	565	IRQF_TRIGGER_RISING \| IRQF_ONESHOT,
	566	"kxtj9-irq", tj9);
	567	if (err) {
	568	dev_err(&client->dev, "request irq failed: %d\n", err);
	569	goto err_destroy_input;
	570	}
	571
	572	err = sysfs_create_group(&client->dev.kobj, &kxtj9_attribute_group);
	573	if (err) {
	574	dev_err(&client->dev, "sysfs create failed: %d\n", err);
	575	goto err_free_irq;
	576	}
	577
	578	} else {
	579	err = kxtj9_setup_polled_device(tj9);
	580	if (err)
	581	goto err_pdata_exit;
	582	}
	583
	584	return 0;
	585
	586	err_free_irq:
	587	free_irq(client->irq, tj9);
	588	err_destroy_input:
	589	input_unregister_device(tj9->input_dev);
	590	err_pdata_exit:
	591	if (tj9->pdata.exit)
	592	tj9->pdata.exit();
	593	err_free_mem:
	594	kfree(tj9);
	595	return err;
	596	}
	597
e2619cf7	598	static int kxtj9_remove(struct i2c_client *client)
e8e70d83 CH	599	{
	600	struct kxtj9_data *tj9 = i2c_get_clientdata(client);
	601
	602	if (client->irq) {
	603	sysfs_remove_group(&client->dev.kobj, &kxtj9_attribute_group);
	604	free_irq(client->irq, tj9);
	605	input_unregister_device(tj9->input_dev);
	606	} else {
	607	kxtj9_teardown_polled_device(tj9);
	608	}
	609
	610	if (tj9->pdata.exit)
	611	tj9->pdata.exit();
	612
	613	kfree(tj9);
	614
	615	return 0;
	616	}
	617
97a652a8	618	static int __maybe_unused kxtj9_suspend(struct device *dev)
e8e70d83 CH	619	{
	620	struct i2c_client *client = to_i2c_client(dev);
	621	struct kxtj9_data *tj9 = i2c_get_clientdata(client);
	622	struct input_dev *input_dev = tj9->input_dev;
	623
	624	mutex_lock(&input_dev->mutex);
	625
	626	if (input_dev->users)
	627	kxtj9_disable(tj9);
	628
	629	mutex_unlock(&input_dev->mutex);
	630	return 0;
	631	}
	632
97a652a8	633	static int __maybe_unused kxtj9_resume(struct device *dev)
e8e70d83 CH	634	{
	635	struct i2c_client *client = to_i2c_client(dev);
	636	struct kxtj9_data *tj9 = i2c_get_clientdata(client);
	637	struct input_dev *input_dev = tj9->input_dev;
e8e70d83 CH	638
	639	mutex_lock(&input_dev->mutex);
	640
	641	if (input_dev->users)
	642	kxtj9_enable(tj9);
	643
	644	mutex_unlock(&input_dev->mutex);
5ccd9abd	645	return 0;
e8e70d83	646	}
e8e70d83 CH	647
	648	static SIMPLE_DEV_PM_OPS(kxtj9_pm_ops, kxtj9_suspend, kxtj9_resume);
	649
	650	static const struct i2c_device_id kxtj9_id[] = {
	651	{ NAME, 0 },
	652	{ },
	653	};
	654
	655	MODULE_DEVICE_TABLE(i2c, kxtj9_id);
	656
	657	static struct i2c_driver kxtj9_driver = {
	658	.driver = {
	659	.name = NAME,
e8e70d83 CH	660	.pm = &kxtj9_pm_ops,
	661	},
	662	.probe = kxtj9_probe,
1cb0aa88	663	.remove = kxtj9_remove,
e8e70d83 CH	664	.id_table = kxtj9_id,
	665	};
	666
1b92c1cf	667	module_i2c_driver(kxtj9_driver);
e8e70d83 CH	668
	669	MODULE_DESCRIPTION("KXTJ9 accelerometer driver");
	670	MODULE_AUTHOR("Chris Hudson <chudson@kionix.com>");
	671	MODULE_LICENSE("GPL");