summaryrefslogtreecommitdiff
path: root/drivers/iio/light/cros_ec_light_prox.c
blob: 721722376fd09835cb995142a0b381507afae3e5 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
/*
 * cros_ec_light_prox - Driver for light and prox sensors behing CrosEC.
 *
 * Copyright (C) 2017 Google, Inc
 *
 * This software is licensed under the terms of the GNU General Public
 * License version 2, as published by the Free Software Foundation, and
 * may be copied, distributed, and modified under those terms.
 *
 * 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.
 */

#include <linux/delay.h>
#include <linux/device.h>
#include <linux/iio/buffer.h>
#include <linux/iio/iio.h>
#include <linux/iio/kfifo_buf.h>
#include <linux/iio/trigger.h>
#include <linux/iio/triggered_buffer.h>
#include <linux/iio/trigger_consumer.h>
#include <linux/kernel.h>
#include <linux/mfd/cros_ec.h>
#include <linux/mfd/cros_ec_commands.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/sysfs.h>

#include "../common/cros_ec_sensors/cros_ec_sensors_core.h"

/*
 * We only represent one entry for light or proximity. EC is merging different
 * light sensors to return the what the eye would see. For proximity, we
 * currently support only one light source.
 */
#define CROS_EC_LIGHT_PROX_MAX_CHANNELS (1 + 1)

/* State data for ec_sensors iio driver. */
struct cros_ec_light_prox_state {
	/* Shared by all sensors */
	struct cros_ec_sensors_core_state core;

	struct iio_chan_spec channels[CROS_EC_LIGHT_PROX_MAX_CHANNELS];
};

static int cros_ec_light_prox_read(struct iio_dev *indio_dev,
				   struct iio_chan_spec const *chan,
				   int *val, int *val2, long mask)
{
	struct cros_ec_light_prox_state *st = iio_priv(indio_dev);
	u16 data = 0;
	s64 val64;
	int ret = IIO_VAL_INT;
	int idx = chan->scan_index;

	mutex_lock(&st->core.cmd_lock);

	switch (mask) {
	case IIO_CHAN_INFO_RAW:
		if (chan->type == IIO_PROXIMITY) {
			if (cros_ec_sensors_read_cmd(indio_dev, 1 << idx,
						     (s16 *)&data) < 0) {
				ret = -EIO;
				break;
			}
			*val = data;
		} else {
			ret = -EINVAL;
		}
		break;
	case IIO_CHAN_INFO_PROCESSED:
		if (chan->type == IIO_LIGHT) {
			if (cros_ec_sensors_read_cmd(indio_dev, 1 << idx,
						     (s16 *)&data) < 0) {
				ret = -EIO;
				break;
			}
			/*
			 * The data coming from the light sensor is
			 * pre-processed and represents the ambient light
			 * illuminance reading expressed in lux.
			 */
			*val = data;
			ret = IIO_VAL_INT;
		} else {
			ret = -EINVAL;
		}
		break;
	case IIO_CHAN_INFO_CALIBBIAS:
		st->core.param.cmd = MOTIONSENSE_CMD_SENSOR_OFFSET;
		st->core.param.sensor_offset.flags = 0;

		if (cros_ec_motion_send_host_cmd(&st->core, 0)) {
			ret = -EIO;
			break;
		}

		/* Save values */
		st->core.calib[0] = st->core.resp->sensor_offset.offset[0];

		*val = st->core.calib[idx];
		break;
	case IIO_CHAN_INFO_CALIBSCALE:
		/*
		 * RANGE is used for calibration
		 * scale is a number x.y, where x is coded on 16 bits,
		 * y coded on 16 bits, between 0 and 9999.
		 */
		st->core.param.cmd = MOTIONSENSE_CMD_SENSOR_RANGE;
		st->core.param.sensor_range.data = EC_MOTION_SENSE_NO_VALUE;

		if (cros_ec_motion_send_host_cmd(&st->core, 0)) {
			ret = -EIO;
			break;
		}

		val64 = st->core.resp->sensor_range.ret;
		*val = val64 >> 16;
		*val2 = (val64 & 0xffff) * 100;
		ret = IIO_VAL_INT_PLUS_MICRO;
		break;
	default:
		ret = cros_ec_sensors_core_read(&st->core, chan, val, val2,
						mask);
		break;
	}

	mutex_unlock(&st->core.cmd_lock);

	return ret;
}

static int cros_ec_light_prox_write(struct iio_dev *indio_dev,
			       struct iio_chan_spec const *chan,
			       int val, int val2, long mask)
{
	struct cros_ec_light_prox_state *st = iio_priv(indio_dev);
	int ret = 0;
	int idx = chan->scan_index;

	mutex_lock(&st->core.cmd_lock);

	switch (mask) {
	case IIO_CHAN_INFO_CALIBBIAS:
		st->core.calib[idx] = val;
		/* Send to EC for each axis, even if not complete */
		st->core.param.cmd = MOTIONSENSE_CMD_SENSOR_OFFSET;
		st->core.param.sensor_offset.flags = MOTION_SENSE_SET_OFFSET;
		st->core.param.sensor_offset.offset[0] = st->core.calib[0];
		st->core.param.sensor_offset.temp =
					EC_MOTION_SENSE_INVALID_CALIB_TEMP;
		if (cros_ec_motion_send_host_cmd(&st->core, 0))
			ret = -EIO;
		break;
	case IIO_CHAN_INFO_CALIBSCALE:
		st->core.param.cmd = MOTIONSENSE_CMD_SENSOR_RANGE;
		st->core.param.sensor_range.data = (val << 16) | (val2 / 100);
		if (cros_ec_motion_send_host_cmd(&st->core, 0))
			ret = -EIO;
		break;
	default:
		ret = cros_ec_sensors_core_write(&st->core, chan, val, val2,
						 mask);
		break;
	}

	mutex_unlock(&st->core.cmd_lock);

	return ret;
}

static const struct iio_info cros_ec_light_prox_info = {
	.read_raw = &cros_ec_light_prox_read,
	.write_raw = &cros_ec_light_prox_write,
	.driver_module = THIS_MODULE,
};

static int cros_ec_light_prox_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct cros_ec_dev *ec_dev = dev_get_drvdata(dev->parent);
	struct cros_ec_device *ec_device;
	struct iio_dev *indio_dev;
	struct cros_ec_light_prox_state *state;
	struct iio_chan_spec *channel;
	int ret;

	if (!ec_dev || !ec_dev->ec_dev) {
		dev_warn(dev, "No CROS EC device found.\n");
		return -EINVAL;
	}
	ec_device = ec_dev->ec_dev;

	indio_dev = devm_iio_device_alloc(dev, sizeof(*state));
	if (!indio_dev)
		return -ENOMEM;

	ret = cros_ec_sensors_core_init(pdev, indio_dev, true);
	if (ret)
		return ret;

	indio_dev->info = &cros_ec_light_prox_info;
	state = iio_priv(indio_dev);
	state->core.type = state->core.resp->info.type;
	state->core.loc = state->core.resp->info.location;
	channel = state->channels;

	/* Common part */
	channel->info_mask_shared_by_all =
		BIT(IIO_CHAN_INFO_SAMP_FREQ) |
		BIT(IIO_CHAN_INFO_FREQUENCY);
	channel->scan_type.realbits = CROS_EC_SENSOR_BITS;
	channel->scan_type.storagebits = CROS_EC_SENSOR_BITS;
	channel->scan_type.shift = 0;
	channel->scan_index = 0;
	channel->ext_info = cros_ec_sensors_ext_info;
	channel->scan_type.sign = 'u';

	state->core.calib[0] = 0;

	/* Sensor specific */
	switch (state->core.type) {
	case MOTIONSENSE_TYPE_LIGHT:
		channel->type = IIO_LIGHT;
		channel->info_mask_separate =
			BIT(IIO_CHAN_INFO_PROCESSED) |
			BIT(IIO_CHAN_INFO_CALIBBIAS) |
			BIT(IIO_CHAN_INFO_CALIBSCALE);
		break;
	case MOTIONSENSE_TYPE_PROX:
		channel->type = IIO_PROXIMITY;
		channel->info_mask_separate =
			BIT(IIO_CHAN_INFO_RAW) |
			BIT(IIO_CHAN_INFO_CALIBBIAS) |
			BIT(IIO_CHAN_INFO_CALIBSCALE);
		break;
	default:
		dev_warn(dev, "Unknown motion sensor\n");
		return -EINVAL;
	}

	/* Timestamp */
	channel++;
	channel->type = IIO_TIMESTAMP;
	channel->channel = -1;
	channel->scan_index = 1;
	channel->scan_type.sign = 's';
	channel->scan_type.realbits = 64;
	channel->scan_type.storagebits = 64;

	indio_dev->channels = state->channels;

	indio_dev->num_channels = CROS_EC_LIGHT_PROX_MAX_CHANNELS;

	state->core.read_ec_sensors_data = cros_ec_sensors_read_cmd;

	ret = devm_iio_triggered_buffer_setup(dev, indio_dev, NULL,
					      cros_ec_sensors_capture, NULL);
	if (ret)
		return ret;

	return devm_iio_device_register(dev, indio_dev);
}

static const struct platform_device_id cros_ec_light_prox_ids[] = {
	{
		.name = "cros-ec-prox",
	},
	{
		.name = "cros-ec-light",
	},
	{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(platform, cros_ec_light_prox_ids);

static struct platform_driver cros_ec_light_prox_platform_driver = {
	.driver = {
		.name	= "cros-ec-light-prox",
	},
	.probe		= cros_ec_light_prox_probe,
	.id_table	= cros_ec_light_prox_ids,
};
module_platform_driver(cros_ec_light_prox_platform_driver);

MODULE_DESCRIPTION("ChromeOS EC light/proximity sensors driver");
MODULE_LICENSE("GPL v2");