[mirror_ubuntu-zesty-kernel.git] / drivers / iio / accel / da280.c

/**
 * IIO driver for the MiraMEMS DA280 3-axis accelerometer and
 * IIO driver for the MiraMEMS DA226 2-axis accelerometer
 *
 * Copyright (c) 2016 Hans de Goede <hdegoede@redhat.com>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 */

#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
#include <linux/byteorder/generic.h>

#define DA280_REG_CHIP_ID		0x01
#define DA280_REG_ACC_X_LSB		0x02
#define DA280_REG_ACC_Y_LSB		0x04
#define DA280_REG_ACC_Z_LSB		0x06
#define DA280_REG_MODE_BW		0x11

#define DA280_CHIP_ID			0x13
#define DA280_MODE_ENABLE		0x1e
#define DA280_MODE_DISABLE		0x9e

enum { da226, da280 };

/*
 * a value of + or -4096 corresponds to + or - 1G
 * scale = 9.81 / 4096 = 0.002395019
 */

static const int da280_nscale = 2395019;

#define DA280_CHANNEL(reg, axis) {	\
	.type = IIO_ACCEL,	\
	.address = reg,	\
	.modified = 1,	\
	.channel2 = IIO_MOD_##axis,	\
	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),	\
	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),	\
}

static const struct iio_chan_spec da280_channels[] = {
	DA280_CHANNEL(DA280_REG_ACC_X_LSB, X),
	DA280_CHANNEL(DA280_REG_ACC_Y_LSB, Y),
	DA280_CHANNEL(DA280_REG_ACC_Z_LSB, Z),
};

struct da280_data {
	struct i2c_client *client;
};

static int da280_enable(struct i2c_client *client, bool enable)
{
	u8 data = enable ? DA280_MODE_ENABLE : DA280_MODE_DISABLE;

	return i2c_smbus_write_byte_data(client, DA280_REG_MODE_BW, data);
}

static int da280_read_raw(struct iio_dev *indio_dev,
				struct iio_chan_spec const *chan,
				int *val, int *val2, long mask)
{
	struct da280_data *data = iio_priv(indio_dev);
	int ret;

	switch (mask) {
	case IIO_CHAN_INFO_RAW:
		ret = i2c_smbus_read_word_data(data->client, chan->address);
		if (ret < 0)
			return ret;
		/*
		 * Values are 14 bits, stored as 16 bits with the 2
		 * least significant bits always 0.
		 */
		*val = (short)ret >> 2;
		return IIO_VAL_INT;
	case IIO_CHAN_INFO_SCALE:
		*val = 0;
		*val2 = da280_nscale;
		return IIO_VAL_INT_PLUS_NANO;
	default:
		return -EINVAL;
	}
}

static const struct iio_info da280_info = {
	.driver_module	= THIS_MODULE,
	.read_raw	= da280_read_raw,
};

static int da280_probe(struct i2c_client *client,
			const struct i2c_device_id *id)
{
	int ret;
	struct iio_dev *indio_dev;
	struct da280_data *data;

	ret = i2c_smbus_read_byte_data(client, DA280_REG_CHIP_ID);
	if (ret != DA280_CHIP_ID)
		return (ret < 0) ? ret : -ENODEV;

	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
	if (!indio_dev)
		return -ENOMEM;

	data = iio_priv(indio_dev);
	data->client = client;
	i2c_set_clientdata(client, indio_dev);

	indio_dev->dev.parent = &client->dev;
	indio_dev->info = &da280_info;
	indio_dev->modes = INDIO_DIRECT_MODE;
	indio_dev->channels = da280_channels;
	if (id->driver_data == da226) {
		indio_dev->name = "da226";
		indio_dev->num_channels = 2;
	} else {
		indio_dev->name = "da280";
		indio_dev->num_channels = 3;
	}

	ret = da280_enable(client, true);
	if (ret < 0)
		return ret;

	ret = iio_device_register(indio_dev);
	if (ret < 0) {
		dev_err(&client->dev, "device_register failed\n");
		da280_enable(client, false);
	}

	return ret;
}

static int da280_remove(struct i2c_client *client)
{
	struct iio_dev *indio_dev = i2c_get_clientdata(client);

	iio_device_unregister(indio_dev);

	return da280_enable(client, false);
}

#ifdef CONFIG_PM_SLEEP
static int da280_suspend(struct device *dev)
{
	return da280_enable(to_i2c_client(dev), false);
}

static int da280_resume(struct device *dev)
{
	return da280_enable(to_i2c_client(dev), true);
}
#endif

static SIMPLE_DEV_PM_OPS(da280_pm_ops, da280_suspend, da280_resume);

static const struct i2c_device_id da280_i2c_id[] = {
	{ "da226", da226 },
	{ "da280", da280 },
	{}
};
MODULE_DEVICE_TABLE(i2c, da280_i2c_id);

static struct i2c_driver da280_driver = {
	.driver = {
		.name = "da280",
		.pm = &da280_pm_ops,
	},
	.probe		= da280_probe,
	.remove		= da280_remove,
	.id_table	= da280_i2c_id,
};

module_i2c_driver(da280_driver);

MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
MODULE_DESCRIPTION("MiraMEMS DA280 3-Axis Accelerometer driver");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
f225951d HG	1	/**
	2	* IIO driver for the MiraMEMS DA280 3-axis accelerometer and
	3	* IIO driver for the MiraMEMS DA226 2-axis accelerometer
	4	*
	5	* Copyright (c) 2016 Hans de Goede <hdegoede@redhat.com>
	6	*
	7	* This program is free software; you can redistribute it and/or modify it
	8	* under the terms and conditions of the GNU General Public License,
	9	* version 2, as published by the Free Software Foundation.
	10	*/
	11
	12	#include <linux/module.h>
	13	#include <linux/i2c.h>
	14	#include <linux/iio/iio.h>
	15	#include <linux/iio/sysfs.h>
	16	#include <linux/byteorder/generic.h>
	17
	18	#define DA280_REG_CHIP_ID 0x01
	19	#define DA280_REG_ACC_X_LSB 0x02
	20	#define DA280_REG_ACC_Y_LSB 0x04
	21	#define DA280_REG_ACC_Z_LSB 0x06
	22	#define DA280_REG_MODE_BW 0x11
	23
	24	#define DA280_CHIP_ID 0x13
	25	#define DA280_MODE_ENABLE 0x1e
	26	#define DA280_MODE_DISABLE 0x9e
	27
	28	enum { da226, da280 };
	29
	30	/*
	31	* a value of + or -4096 corresponds to + or - 1G
	32	* scale = 9.81 / 4096 = 0.002395019
	33	*/
	34
	35	static const int da280_nscale = 2395019;
	36
	37	#define DA280_CHANNEL(reg, axis) { \
	38	.type = IIO_ACCEL, \
	39	.address = reg, \
	40	.modified = 1, \
	41	.channel2 = IIO_MOD_##axis, \
	42	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
	43	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
	44	}
	45
	46	static const struct iio_chan_spec da280_channels[] = {
	47	DA280_CHANNEL(DA280_REG_ACC_X_LSB, X),
	48	DA280_CHANNEL(DA280_REG_ACC_Y_LSB, Y),
	49	DA280_CHANNEL(DA280_REG_ACC_Z_LSB, Z),
	50	};
	51
	52	struct da280_data {
	53	struct i2c_client *client;
	54	};
	55
	56	static int da280_enable(struct i2c_client *client, bool enable)
	57	{
	58	u8 data = enable ? DA280_MODE_ENABLE : DA280_MODE_DISABLE;
	59
	60	return i2c_smbus_write_byte_data(client, DA280_REG_MODE_BW, data);
	61	}
	62
	63	static int da280_read_raw(struct iio_dev *indio_dev,
	64	struct iio_chan_spec const *chan,
65	int val, int val2, long mask)
66	{
67	struct da280_data *data = iio_priv(indio_dev);
68	int ret;
69
70	switch (mask) {
71	case IIO_CHAN_INFO_RAW:
72	ret = i2c_smbus_read_word_data(data->client, chan->address);
73	if (ret < 0)
74	return ret;
75	/*
76	* Values are 14 bits, stored as 16 bits with the 2
77	* least significant bits always 0.
78	*/
79	*val = (short)ret >> 2;
80	return IIO_VAL_INT;
81	case IIO_CHAN_INFO_SCALE:
82	*val = 0;
83	*val2 = da280_nscale;
84	return IIO_VAL_INT_PLUS_NANO;
85	default:
86	return -EINVAL;
87	}
88	}
89
90	static const struct iio_info da280_info = {
91	.driver_module = THIS_MODULE,
92	.read_raw = da280_read_raw,
93	};
94
95	static int da280_probe(struct i2c_client *client,
96	const struct i2c_device_id *id)
97	{
98	int ret;
99	struct iio_dev *indio_dev;
100	struct da280_data *data;
101
102	ret = i2c_smbus_read_byte_data(client, DA280_REG_CHIP_ID);
103	if (ret != DA280_CHIP_ID)
104	return (ret < 0) ? ret : -ENODEV;
105
106	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
107	if (!indio_dev)
108	return -ENOMEM;
109
110	data = iio_priv(indio_dev);
111	data->client = client;
112	i2c_set_clientdata(client, indio_dev);
113
114	indio_dev->dev.parent = &client->dev;
115	indio_dev->info = &da280_info;
116	indio_dev->modes = INDIO_DIRECT_MODE;
117	indio_dev->channels = da280_channels;
118	if (id->driver_data == da226) {
119	indio_dev->name = "da226";
120	indio_dev->num_channels = 2;
121	} else {
122	indio_dev->name = "da280";
123	indio_dev->num_channels = 3;
124	}
125
126	ret = da280_enable(client, true);
127	if (ret < 0)
128	return ret;
129
130	ret = iio_device_register(indio_dev);
131	if (ret < 0) {
132	dev_err(&client->dev, "device_register failed\n");
133	da280_enable(client, false);
134	}
135
136	return ret;
137	}
138
139	static int da280_remove(struct i2c_client *client)
140	{
141	struct iio_dev *indio_dev = i2c_get_clientdata(client);
142
143	iio_device_unregister(indio_dev);
144
145	return da280_enable(client, false);
146	}
147
148	#ifdef CONFIG_PM_SLEEP
149	static int da280_suspend(struct device *dev)
150	{
151	return da280_enable(to_i2c_client(dev), false);
152	}
153
154	static int da280_resume(struct device *dev)
155	{
156	return da280_enable(to_i2c_client(dev), true);
157	}
158	#endif
159
160	static SIMPLE_DEV_PM_OPS(da280_pm_ops, da280_suspend, da280_resume);
161
162	static const struct i2c_device_id da280_i2c_id[] = {
163	{ "da226", da226 },
164	{ "da280", da280 },
165	{}
166	};
167	MODULE_DEVICE_TABLE(i2c, da280_i2c_id);
168
169	static struct i2c_driver da280_driver = {
170	.driver = {
171	.name = "da280",
172	.pm = &da280_pm_ops,
173	},
174	.probe = da280_probe,
175	.remove = da280_remove,
176	.id_table = da280_i2c_id,
177	};
178
179	module_i2c_driver(da280_driver);
180
181	MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
182	MODULE_DESCRIPTION("MiraMEMS DA280 3-Axis Accelerometer driver");
183	MODULE_LICENSE("GPL v2");