This source file includes following definitions.
- cros_ec_baro_read
- cros_ec_baro_write
- cros_ec_baro_probe
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8 #include <linux/device.h>
9 #include <linux/iio/buffer.h>
10 #include <linux/iio/common/cros_ec_sensors_core.h>
11 #include <linux/iio/iio.h>
12 #include <linux/iio/kfifo_buf.h>
13 #include <linux/iio/trigger.h>
14 #include <linux/iio/triggered_buffer.h>
15 #include <linux/iio/trigger_consumer.h>
16 #include <linux/kernel.h>
17 #include <linux/mfd/cros_ec.h>
18 #include <linux/module.h>
19 #include <linux/slab.h>
20 #include <linux/platform_data/cros_ec_commands.h>
21 #include <linux/platform_data/cros_ec_proto.h>
22 #include <linux/platform_device.h>
23
24
25
26
27 #define CROS_EC_BARO_MAX_CHANNELS (1 + 1)
28
29
30 struct cros_ec_baro_state {
31
32 struct cros_ec_sensors_core_state core;
33
34 struct iio_chan_spec channels[CROS_EC_BARO_MAX_CHANNELS];
35 };
36
37 static int cros_ec_baro_read(struct iio_dev *indio_dev,
38 struct iio_chan_spec const *chan,
39 int *val, int *val2, long mask)
40 {
41 struct cros_ec_baro_state *st = iio_priv(indio_dev);
42 u16 data = 0;
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 = cros_ec_sensors_read_cmd(indio_dev, 1 << idx,
51 (s16 *)&data);
52 if (ret)
53 break;
54
55 *val = data;
56 ret = IIO_VAL_INT;
57 break;
58 case IIO_CHAN_INFO_SCALE:
59 st->core.param.cmd = MOTIONSENSE_CMD_SENSOR_RANGE;
60 st->core.param.sensor_range.data = EC_MOTION_SENSE_NO_VALUE;
61
62 ret = cros_ec_motion_send_host_cmd(&st->core, 0);
63 if (ret)
64 break;
65
66 *val = st->core.resp->sensor_range.ret;
67
68
69 *val2 = 10 << CROS_EC_SENSOR_BITS;
70 ret = IIO_VAL_FRACTIONAL;
71 break;
72 default:
73 ret = cros_ec_sensors_core_read(&st->core, chan, val, val2,
74 mask);
75 break;
76 }
77
78 mutex_unlock(&st->core.cmd_lock);
79
80 return ret;
81 }
82
83 static int cros_ec_baro_write(struct iio_dev *indio_dev,
84 struct iio_chan_spec const *chan,
85 int val, int val2, long mask)
86 {
87 struct cros_ec_baro_state *st = iio_priv(indio_dev);
88 int ret = 0;
89
90 mutex_lock(&st->core.cmd_lock);
91
92 switch (mask) {
93 case IIO_CHAN_INFO_SCALE:
94 st->core.param.cmd = MOTIONSENSE_CMD_SENSOR_RANGE;
95 st->core.param.sensor_range.data = val;
96
97
98 st->core.param.sensor_range.roundup = 1;
99
100 if (cros_ec_motion_send_host_cmd(&st->core, 0))
101 ret = -EIO;
102 break;
103 default:
104 ret = cros_ec_sensors_core_write(&st->core, chan, val, val2,
105 mask);
106 break;
107 }
108
109 mutex_unlock(&st->core.cmd_lock);
110
111 return ret;
112 }
113
114 static const struct iio_info cros_ec_baro_info = {
115 .read_raw = &cros_ec_baro_read,
116 .write_raw = &cros_ec_baro_write,
117 .read_avail = &cros_ec_sensors_core_read_avail,
118 };
119
120 static int cros_ec_baro_probe(struct platform_device *pdev)
121 {
122 struct device *dev = &pdev->dev;
123 struct cros_ec_dev *ec_dev = dev_get_drvdata(dev->parent);
124 struct iio_dev *indio_dev;
125 struct cros_ec_baro_state *state;
126 struct iio_chan_spec *channel;
127 int ret;
128
129 if (!ec_dev || !ec_dev->ec_dev) {
130 dev_warn(dev, "No CROS EC device found.\n");
131 return -EINVAL;
132 }
133
134 indio_dev = devm_iio_device_alloc(dev, sizeof(*state));
135 if (!indio_dev)
136 return -ENOMEM;
137
138 ret = cros_ec_sensors_core_init(pdev, indio_dev, true);
139 if (ret)
140 return ret;
141
142 indio_dev->info = &cros_ec_baro_info;
143 state = iio_priv(indio_dev);
144 state->core.type = state->core.resp->info.type;
145 state->core.loc = state->core.resp->info.location;
146 channel = state->channels;
147
148 channel->info_mask_separate = BIT(IIO_CHAN_INFO_RAW);
149 channel->info_mask_shared_by_all =
150 BIT(IIO_CHAN_INFO_SCALE) |
151 BIT(IIO_CHAN_INFO_SAMP_FREQ) |
152 BIT(IIO_CHAN_INFO_FREQUENCY);
153 channel->info_mask_shared_by_all_available =
154 BIT(IIO_CHAN_INFO_SAMP_FREQ);
155 channel->scan_type.realbits = CROS_EC_SENSOR_BITS;
156 channel->scan_type.storagebits = CROS_EC_SENSOR_BITS;
157 channel->scan_type.shift = 0;
158 channel->scan_index = 0;
159 channel->ext_info = cros_ec_sensors_ext_info;
160 channel->scan_type.sign = 'u';
161
162
163 switch (state->core.type) {
164 case MOTIONSENSE_TYPE_BARO:
165 channel->type = IIO_PRESSURE;
166 break;
167 default:
168 dev_warn(dev, "Unknown motion sensor\n");
169 return -EINVAL;
170 }
171
172
173 channel++;
174 channel->type = IIO_TIMESTAMP;
175 channel->channel = -1;
176 channel->scan_index = 1;
177 channel->scan_type.sign = 's';
178 channel->scan_type.realbits = 64;
179 channel->scan_type.storagebits = 64;
180
181 indio_dev->channels = state->channels;
182 indio_dev->num_channels = CROS_EC_BARO_MAX_CHANNELS;
183
184 state->core.read_ec_sensors_data = cros_ec_sensors_read_cmd;
185
186 ret = devm_iio_triggered_buffer_setup(dev, indio_dev, NULL,
187 cros_ec_sensors_capture, NULL);
188 if (ret)
189 return ret;
190
191 return devm_iio_device_register(dev, indio_dev);
192 }
193
194 static const struct platform_device_id cros_ec_baro_ids[] = {
195 {
196 .name = "cros-ec-baro",
197 },
198 { }
199 };
200 MODULE_DEVICE_TABLE(platform, cros_ec_baro_ids);
201
202 static struct platform_driver cros_ec_baro_platform_driver = {
203 .driver = {
204 .name = "cros-ec-baro",
205 },
206 .probe = cros_ec_baro_probe,
207 .id_table = cros_ec_baro_ids,
208 };
209 module_platform_driver(cros_ec_baro_platform_driver);
210
211 MODULE_DESCRIPTION("ChromeOS EC barometer sensor driver");
212 MODULE_LICENSE("GPL v2");