[deliverable/linux.git] / drivers / iio / temperature / tsys02d.c

/*
 * tsys02d.c - Support for Measurement-Specialties tsys02d temperature sensor
 *
 * Copyright (c) 2015 Measurement-Specialties
 *
 * Licensed under the GPL-2.
 *
 * (7-bit I2C slave address 0x40)
 *
 * Datasheet:
 *  http://www.meas-spec.com/downloads/Digital_Sensor_TSYS02D.pdf
 */

#include <linux/init.h>
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/stat.h>
#include <linux/module.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>

#include "../common/ms_sensors/ms_sensors_i2c.h"

#define TSYS02D_RESET				0xFE

static const int tsys02d_samp_freq[4] = { 20, 40, 70, 140 };
/* String copy of the above const for readability purpose */
static const char tsys02d_show_samp_freq[] = "20 40 70 140";

static int tsys02d_read_raw(struct iio_dev *indio_dev,
			    struct iio_chan_spec const *channel, int *val,
			    int *val2, long mask)
{
	int ret;
	s32 temperature;
	struct ms_ht_dev *dev_data = iio_priv(indio_dev);

	switch (mask) {
	case IIO_CHAN_INFO_PROCESSED:
		switch (channel->type) {
		case IIO_TEMP:	/* in milli °C */
			ret = ms_sensors_ht_read_temperature(dev_data,
							     &temperature);
			if (ret)
				return ret;
			*val = temperature;

			return IIO_VAL_INT;
		default:
			return -EINVAL;
		}
	case IIO_CHAN_INFO_SAMP_FREQ:
		*val = tsys02d_samp_freq[dev_data->res_index];

		return IIO_VAL_INT;
	default:
		return -EINVAL;
	}
}

static int tsys02d_write_raw(struct iio_dev *indio_dev,
			     struct iio_chan_spec const *chan,
			     int val, int val2, long mask)
{
	struct ms_ht_dev *dev_data = iio_priv(indio_dev);
	int i, ret;

	switch (mask) {
	case IIO_CHAN_INFO_SAMP_FREQ:
		i = ARRAY_SIZE(tsys02d_samp_freq);
		while (i-- > 0)
			if (val == tsys02d_samp_freq[i])
				break;
		if (i < 0)
			return -EINVAL;
		mutex_lock(&dev_data->lock);
		dev_data->res_index = i;
		ret = ms_sensors_write_resolution(dev_data, i);
		mutex_unlock(&dev_data->lock);

		return ret;
	default:
		return -EINVAL;
	}
}

static const struct iio_chan_spec tsys02d_channels[] = {
	{
		.type = IIO_TEMP,
		.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_PROCESSED),
		.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
	}
};

static ssize_t tsys02_read_battery_low(struct device *dev,
				       struct device_attribute *attr,
				       char *buf)
{
	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
	struct ms_ht_dev *dev_data = iio_priv(indio_dev);

	return ms_sensors_show_battery_low(dev_data, buf);
}

static IIO_CONST_ATTR_SAMP_FREQ_AVAIL(tsys02d_show_samp_freq);
static IIO_DEVICE_ATTR(battery_low, S_IRUGO,
		       tsys02_read_battery_low, NULL, 0);

static struct attribute *tsys02d_attributes[] = {
	&iio_const_attr_sampling_frequency_available.dev_attr.attr,
	&iio_dev_attr_battery_low.dev_attr.attr,
	NULL,
};

static const struct attribute_group tsys02d_attribute_group = {
	.attrs = tsys02d_attributes,
};

static const struct iio_info tsys02d_info = {
	.read_raw = tsys02d_read_raw,
	.write_raw = tsys02d_write_raw,
	.attrs = &tsys02d_attribute_group,
	.driver_module = THIS_MODULE,
};

static int tsys02d_probe(struct i2c_client *client,
			 const struct i2c_device_id *id)
{
	struct ms_ht_dev *dev_data;
	struct iio_dev *indio_dev;
	int ret;
	u64 serial_number;

	if (!i2c_check_functionality(client->adapter,
				     I2C_FUNC_SMBUS_WRITE_BYTE_DATA |
				     I2C_FUNC_SMBUS_WRITE_BYTE |
				     I2C_FUNC_SMBUS_READ_I2C_BLOCK)) {
		dev_err(&client->dev,
			"Adapter does not support some i2c transaction\n");
		return -ENODEV;
	}

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

	dev_data = iio_priv(indio_dev);
	dev_data->client = client;
	dev_data->res_index = 0;
	mutex_init(&dev_data->lock);

	indio_dev->info = &tsys02d_info;
	indio_dev->name = id->name;
	indio_dev->dev.parent = &client->dev;
	indio_dev->modes = INDIO_DIRECT_MODE;
	indio_dev->channels = tsys02d_channels;
	indio_dev->num_channels = ARRAY_SIZE(tsys02d_channels);

	i2c_set_clientdata(client, indio_dev);

	ret = ms_sensors_reset(client, TSYS02D_RESET, 15000);
	if (ret)
		return ret;

	ret = ms_sensors_read_serial(client, &serial_number);
	if (ret)
		return ret;
	dev_info(&client->dev, "Serial number : %llx", serial_number);

	return devm_iio_device_register(&client->dev, indio_dev);
}

static const struct i2c_device_id tsys02d_id[] = {
	{"tsys02d", 0},
	{}
};

static struct i2c_driver tsys02d_driver = {
	.probe = tsys02d_probe,
	.id_table = tsys02d_id,
	.driver = {
		   .name = "tsys02d",
		   },
};

module_i2c_driver(tsys02d_driver);

MODULE_DESCRIPTION("Measurement-Specialties tsys02d temperature driver");
MODULE_AUTHOR("William Markezana <william.markezana@meas-spec.com>");
MODULE_AUTHOR("Ludovic Tancerel <ludovic.tancerel@maplehightech.com>");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
53bf4d06 LT	1	/*
	2	* tsys02d.c - Support for Measurement-Specialties tsys02d temperature sensor
	3	*
	4	* Copyright (c) 2015 Measurement-Specialties
	5	*
	6	* Licensed under the GPL-2.
	7	*
	8	* (7-bit I2C slave address 0x40)
	9	*
	10	* Datasheet:
	11	* http://www.meas-spec.com/downloads/Digital_Sensor_TSYS02D.pdf
	12	*/
	13
	14	#include <linux/init.h>
	15	#include <linux/device.h>
	16	#include <linux/kernel.h>
	17	#include <linux/stat.h>
	18	#include <linux/module.h>
	19	#include <linux/iio/iio.h>
	20	#include <linux/iio/sysfs.h>
	21
	22	#include "../common/ms_sensors/ms_sensors_i2c.h"
	23
	24	#define TSYS02D_RESET 0xFE
	25
	26	static const int tsys02d_samp_freq[4] = { 20, 40, 70, 140 };
	27	/* String copy of the above const for readability purpose */
	28	static const char tsys02d_show_samp_freq[] = "20 40 70 140";
	29
	30	static int tsys02d_read_raw(struct iio_dev *indio_dev,
	31	struct iio_chan_spec const channel, int val,
	32	int *val2, long mask)
	33	{
	34	int ret;
	35	s32 temperature;
	36	struct ms_ht_dev *dev_data = iio_priv(indio_dev);
	37
	38	switch (mask) {
	39	case IIO_CHAN_INFO_PROCESSED:
	40	switch (channel->type) {
	41	case IIO_TEMP: /* in milli °C */
	42	ret = ms_sensors_ht_read_temperature(dev_data,
	43	&temperature);
	44	if (ret)
	45	return ret;
	46	*val = temperature;
	47
	48	return IIO_VAL_INT;
	49	default:
	50	return -EINVAL;
	51	}
	52	case IIO_CHAN_INFO_SAMP_FREQ:
	53	*val = tsys02d_samp_freq[dev_data->res_index];
	54
	55	return IIO_VAL_INT;
	56	default:
	57	return -EINVAL;
	58	}
	59	}
	60
	61	static int tsys02d_write_raw(struct iio_dev *indio_dev,
	62	struct iio_chan_spec const *chan,
	63	int val, int val2, long mask)
	64	{
65	struct ms_ht_dev *dev_data = iio_priv(indio_dev);
66	int i, ret;
67
68	switch (mask) {
69	case IIO_CHAN_INFO_SAMP_FREQ:
70	i = ARRAY_SIZE(tsys02d_samp_freq);
71	while (i-- > 0)
72	if (val == tsys02d_samp_freq[i])
73	break;
74	if (i < 0)
75	return -EINVAL;
76	mutex_lock(&dev_data->lock);
77	dev_data->res_index = i;
78	ret = ms_sensors_write_resolution(dev_data, i);
79	mutex_unlock(&dev_data->lock);
80
81	return ret;
82	default:
83	return -EINVAL;
84	}
85	}
86
87	static const struct iio_chan_spec tsys02d_channels[] = {
88	{
89	.type = IIO_TEMP,
90	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_PROCESSED),
91	.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
92	}
93	};
94
95	static ssize_t tsys02_read_battery_low(struct device *dev,
96	struct device_attribute *attr,
97	char *buf)
98	{
99	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
100	struct ms_ht_dev *dev_data = iio_priv(indio_dev);
101
102	return ms_sensors_show_battery_low(dev_data, buf);
103	}
104
105	static IIO_CONST_ATTR_SAMP_FREQ_AVAIL(tsys02d_show_samp_freq);
106	static IIO_DEVICE_ATTR(battery_low, S_IRUGO,
107	tsys02_read_battery_low, NULL, 0);
108
109	static struct attribute *tsys02d_attributes[] = {
110	&iio_const_attr_sampling_frequency_available.dev_attr.attr,
111	&iio_dev_attr_battery_low.dev_attr.attr,
112	NULL,
113	};
114
115	static const struct attribute_group tsys02d_attribute_group = {
116	.attrs = tsys02d_attributes,
117	};
118
119	static const struct iio_info tsys02d_info = {
120	.read_raw = tsys02d_read_raw,
121	.write_raw = tsys02d_write_raw,
122	.attrs = &tsys02d_attribute_group,
123	.driver_module = THIS_MODULE,
124	};
125
126	static int tsys02d_probe(struct i2c_client *client,
127	const struct i2c_device_id *id)
128	{
129	struct ms_ht_dev *dev_data;
130	struct iio_dev *indio_dev;
131	int ret;
132	u64 serial_number;
133
134	if (!i2c_check_functionality(client->adapter,
135	I2C_FUNC_SMBUS_WRITE_BYTE_DATA \|
136	I2C_FUNC_SMBUS_WRITE_BYTE \|
137	I2C_FUNC_SMBUS_READ_I2C_BLOCK)) {
138	dev_err(&client->dev,
139	"Adapter does not support some i2c transaction\n");
140	return -ENODEV;
141	}
142
143	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*dev_data));
144	if (!indio_dev)
145	return -ENOMEM;
146
147	dev_data = iio_priv(indio_dev);
148	dev_data->client = client;
149	dev_data->res_index = 0;
150	mutex_init(&dev_data->lock);
151
152	indio_dev->info = &tsys02d_info;
153	indio_dev->name = id->name;
154	indio_dev->dev.parent = &client->dev;
155	indio_dev->modes = INDIO_DIRECT_MODE;
156	indio_dev->channels = tsys02d_channels;
157	indio_dev->num_channels = ARRAY_SIZE(tsys02d_channels);
158
159	i2c_set_clientdata(client, indio_dev);
160
161	ret = ms_sensors_reset(client, TSYS02D_RESET, 15000);
162	if (ret)
163	return ret;
164
165	ret = ms_sensors_read_serial(client, &serial_number);
166	if (ret)
167	return ret;
168	dev_info(&client->dev, "Serial number : %llx", serial_number);
169
170	return devm_iio_device_register(&client->dev, indio_dev);
171	}
172
173	static const struct i2c_device_id tsys02d_id[] = {
174	{"tsys02d", 0},
175	{}
176	};
177
178	static struct i2c_driver tsys02d_driver = {
179	.probe = tsys02d_probe,
180	.id_table = tsys02d_id,
181	.driver = {
182	.name = "tsys02d",
183	},
184	};
185
186	module_i2c_driver(tsys02d_driver);
187
188	MODULE_DESCRIPTION("Measurement-Specialties tsys02d temperature driver");
189	MODULE_AUTHOR("William Markezana <william.markezana@meas-spec.com>");
190	MODULE_AUTHOR("Ludovic Tancerel <ludovic.tancerel@maplehightech.com>");
191	MODULE_LICENSE("GPL v2");