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11#include <linux/device.h>
12#include <linux/iio/buffer.h>
13#include <linux/iio/common/cros_ec_sensors_core.h>
14#include <linux/iio/iio.h>
15#include <linux/iio/kfifo_buf.h>
16#include <linux/iio/trigger_consumer.h>
17#include <linux/iio/triggered_buffer.h>
18#include <linux/kernel.h>
19#include <linux/mfd/cros_ec.h>
20#include <linux/mfd/cros_ec_commands.h>
21#include <linux/module.h>
22#include <linux/platform_device.h>
23#include <linux/slab.h>
24
25#define CROS_EC_SENSORS_MAX_CHANNELS 4
26
27
28struct cros_ec_sensors_state {
29
30 struct cros_ec_sensors_core_state core;
31
32 struct iio_chan_spec channels[CROS_EC_SENSORS_MAX_CHANNELS];
33};
34
35static int cros_ec_sensors_read(struct iio_dev *indio_dev,
36 struct iio_chan_spec const *chan,
37 int *val, int *val2, long mask)
38{
39 struct cros_ec_sensors_state *st = iio_priv(indio_dev);
40 s16 data = 0;
41 s64 val64;
42 int i;
43 int ret;
44 int idx = chan->scan_index;
45
46 mutex_lock(&st->core.cmd_lock);
47
48 switch (mask) {
49 case IIO_CHAN_INFO_RAW:
50 ret = st->core.read_ec_sensors_data(indio_dev, 1 << idx, &data);
51 if (ret < 0)
52 break;
53 ret = IIO_VAL_INT;
54 *val = data;
55 break;
56 case IIO_CHAN_INFO_CALIBBIAS:
57 st->core.param.cmd = MOTIONSENSE_CMD_SENSOR_OFFSET;
58 st->core.param.sensor_offset.flags = 0;
59
60 ret = cros_ec_motion_send_host_cmd(&st->core, 0);
61 if (ret < 0)
62 break;
63
64
65 for (i = CROS_EC_SENSOR_X; i < CROS_EC_SENSOR_MAX_AXIS; i++)
66 st->core.calib[i] =
67 st->core.resp->sensor_offset.offset[i];
68 ret = IIO_VAL_INT;
69 *val = st->core.calib[idx];
70 break;
71 case IIO_CHAN_INFO_SCALE:
72 st->core.param.cmd = MOTIONSENSE_CMD_SENSOR_RANGE;
73 st->core.param.sensor_range.data = EC_MOTION_SENSE_NO_VALUE;
74
75 ret = cros_ec_motion_send_host_cmd(&st->core, 0);
76 if (ret < 0)
77 break;
78
79 val64 = st->core.resp->sensor_range.ret;
80 switch (st->core.type) {
81 case MOTIONSENSE_TYPE_ACCEL:
82
83
84
85
86 *val = div_s64(val64 * 980665, 10);
87 *val2 = 10000 << (CROS_EC_SENSOR_BITS - 1);
88 ret = IIO_VAL_FRACTIONAL;
89 break;
90 case MOTIONSENSE_TYPE_GYRO:
91
92
93
94
95
96 *val = 0;
97 *val2 = div_s64(val64 * 3141592653ULL,
98 180 << (CROS_EC_SENSOR_BITS - 1));
99 ret = IIO_VAL_INT_PLUS_NANO;
100 break;
101 case MOTIONSENSE_TYPE_MAG:
102
103
104
105
106 *val = val64;
107 *val2 = 100 << (CROS_EC_SENSOR_BITS - 1);
108 ret = IIO_VAL_FRACTIONAL;
109 break;
110 default:
111 ret = -EINVAL;
112 }
113 break;
114 default:
115 ret = cros_ec_sensors_core_read(&st->core, chan, val, val2,
116 mask);
117 break;
118 }
119 mutex_unlock(&st->core.cmd_lock);
120
121 return ret;
122}
123
124static int cros_ec_sensors_write(struct iio_dev *indio_dev,
125 struct iio_chan_spec const *chan,
126 int val, int val2, long mask)
127{
128 struct cros_ec_sensors_state *st = iio_priv(indio_dev);
129 int i;
130 int ret;
131 int idx = chan->scan_index;
132
133 mutex_lock(&st->core.cmd_lock);
134
135 switch (mask) {
136 case IIO_CHAN_INFO_CALIBBIAS:
137 st->core.calib[idx] = val;
138
139
140 st->core.param.cmd = MOTIONSENSE_CMD_SENSOR_OFFSET;
141 st->core.param.sensor_offset.flags =
142 MOTION_SENSE_SET_OFFSET;
143 for (i = CROS_EC_SENSOR_X; i < CROS_EC_SENSOR_MAX_AXIS; i++)
144 st->core.param.sensor_offset.offset[i] =
145 st->core.calib[i];
146 st->core.param.sensor_offset.temp =
147 EC_MOTION_SENSE_INVALID_CALIB_TEMP;
148
149 ret = cros_ec_motion_send_host_cmd(&st->core, 0);
150 break;
151 case IIO_CHAN_INFO_SCALE:
152 if (st->core.type == MOTIONSENSE_TYPE_MAG) {
153 ret = -EINVAL;
154 break;
155 }
156 st->core.param.cmd = MOTIONSENSE_CMD_SENSOR_RANGE;
157 st->core.param.sensor_range.data = val;
158
159
160 st->core.param.sensor_range.roundup = 1;
161
162 ret = cros_ec_motion_send_host_cmd(&st->core, 0);
163 break;
164 default:
165 ret = cros_ec_sensors_core_write(
166 &st->core, chan, val, val2, mask);
167 break;
168 }
169
170 mutex_unlock(&st->core.cmd_lock);
171
172 return ret;
173}
174
175static const struct iio_info ec_sensors_info = {
176 .read_raw = &cros_ec_sensors_read,
177 .write_raw = &cros_ec_sensors_write,
178};
179
180static int cros_ec_sensors_probe(struct platform_device *pdev)
181{
182 struct device *dev = &pdev->dev;
183 struct cros_ec_dev *ec_dev = dev_get_drvdata(dev->parent);
184 struct iio_dev *indio_dev;
185 struct cros_ec_sensors_state *state;
186 struct iio_chan_spec *channel;
187 int ret, i;
188
189 if (!ec_dev || !ec_dev->ec_dev) {
190 dev_warn(&pdev->dev, "No CROS EC device found.\n");
191 return -EINVAL;
192 }
193
194 indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*state));
195 if (!indio_dev)
196 return -ENOMEM;
197
198 ret = cros_ec_sensors_core_init(pdev, indio_dev, true);
199 if (ret)
200 return ret;
201
202 indio_dev->info = &ec_sensors_info;
203 state = iio_priv(indio_dev);
204 for (channel = state->channels, i = CROS_EC_SENSOR_X;
205 i < CROS_EC_SENSOR_MAX_AXIS; i++, channel++) {
206
207 channel->info_mask_separate =
208 BIT(IIO_CHAN_INFO_RAW) |
209 BIT(IIO_CHAN_INFO_CALIBBIAS);
210 channel->info_mask_shared_by_all =
211 BIT(IIO_CHAN_INFO_SCALE) |
212 BIT(IIO_CHAN_INFO_FREQUENCY) |
213 BIT(IIO_CHAN_INFO_SAMP_FREQ);
214 channel->scan_type.realbits = CROS_EC_SENSOR_BITS;
215 channel->scan_type.storagebits = CROS_EC_SENSOR_BITS;
216 channel->scan_index = i;
217 channel->ext_info = cros_ec_sensors_ext_info;
218 channel->modified = 1;
219 channel->channel2 = IIO_MOD_X + i;
220 channel->scan_type.sign = 's';
221
222
223 switch (state->core.type) {
224 case MOTIONSENSE_TYPE_ACCEL:
225 channel->type = IIO_ACCEL;
226 break;
227 case MOTIONSENSE_TYPE_GYRO:
228 channel->type = IIO_ANGL_VEL;
229 break;
230 case MOTIONSENSE_TYPE_MAG:
231 channel->type = IIO_MAGN;
232 break;
233 default:
234 dev_err(&pdev->dev, "Unknown motion sensor\n");
235 return -EINVAL;
236 }
237 }
238
239
240 channel->type = IIO_TIMESTAMP;
241 channel->channel = -1;
242 channel->scan_index = CROS_EC_SENSOR_MAX_AXIS;
243 channel->scan_type.sign = 's';
244 channel->scan_type.realbits = 64;
245 channel->scan_type.storagebits = 64;
246
247 indio_dev->channels = state->channels;
248 indio_dev->num_channels = CROS_EC_SENSORS_MAX_CHANNELS;
249
250
251 if ((state->core.ec->cmd_readmem != NULL) &&
252 (state->core.type != MOTIONSENSE_TYPE_MAG))
253 state->core.read_ec_sensors_data = cros_ec_sensors_read_lpc;
254 else
255 state->core.read_ec_sensors_data = cros_ec_sensors_read_cmd;
256
257 ret = devm_iio_triggered_buffer_setup(dev, indio_dev, NULL,
258 cros_ec_sensors_capture, NULL);
259 if (ret)
260 return ret;
261
262 return devm_iio_device_register(dev, indio_dev);
263}
264
265static const struct platform_device_id cros_ec_sensors_ids[] = {
266 {
267 .name = "cros-ec-accel",
268 },
269 {
270 .name = "cros-ec-gyro",
271 },
272 {
273 .name = "cros-ec-mag",
274 },
275 { }
276};
277MODULE_DEVICE_TABLE(platform, cros_ec_sensors_ids);
278
279static struct platform_driver cros_ec_sensors_platform_driver = {
280 .driver = {
281 .name = "cros-ec-sensors",
282 .pm = &cros_ec_sensors_pm_ops,
283 },
284 .probe = cros_ec_sensors_probe,
285 .id_table = cros_ec_sensors_ids,
286};
287module_platform_driver(cros_ec_sensors_platform_driver);
288
289MODULE_DESCRIPTION("ChromeOS EC 3-axis sensors driver");
290MODULE_LICENSE("GPL v2");
291
