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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/mfd/cros_ec_commands.h>
19#include <linux/module.h>
20#include <linux/slab.h>
21#include <linux/platform_device.h>
22
23
24
25
26#define CROS_EC_BARO_MAX_CHANNELS (1 + 1)
27
28
29struct cros_ec_baro_state {
30
31 struct cros_ec_sensors_core_state core;
32
33 struct iio_chan_spec channels[CROS_EC_BARO_MAX_CHANNELS];
34};
35
36static int cros_ec_baro_read(struct iio_dev *indio_dev,
37 struct iio_chan_spec const *chan,
38 int *val, int *val2, long mask)
39{
40 struct cros_ec_baro_state *st = iio_priv(indio_dev);
41 u16 data = 0;
42 int ret = IIO_VAL_INT;
43 int idx = chan->scan_index;
44
45 mutex_lock(&st->core.cmd_lock);
46
47 switch (mask) {
48 case IIO_CHAN_INFO_RAW:
49 if (cros_ec_sensors_read_cmd(indio_dev, 1 << idx,
50 (s16 *)&data) < 0)
51 ret = -EIO;
52 *val = data;
53 break;
54 case IIO_CHAN_INFO_SCALE:
55 st->core.param.cmd = MOTIONSENSE_CMD_SENSOR_RANGE;
56 st->core.param.sensor_range.data = EC_MOTION_SENSE_NO_VALUE;
57
58 if (cros_ec_motion_send_host_cmd(&st->core, 0)) {
59 ret = -EIO;
60 break;
61 }
62 *val = st->core.resp->sensor_range.ret;
63
64
65 *val2 = 10 << CROS_EC_SENSOR_BITS;
66 ret = IIO_VAL_FRACTIONAL;
67 break;
68 default:
69 ret = cros_ec_sensors_core_read(&st->core, chan, val, val2,
70 mask);
71 break;
72 }
73
74 mutex_unlock(&st->core.cmd_lock);
75
76 return ret;
77}
78
79static int cros_ec_baro_write(struct iio_dev *indio_dev,
80 struct iio_chan_spec const *chan,
81 int val, int val2, long mask)
82{
83 struct cros_ec_baro_state *st = iio_priv(indio_dev);
84 int ret = 0;
85
86 mutex_lock(&st->core.cmd_lock);
87
88 switch (mask) {
89 case IIO_CHAN_INFO_SCALE:
90 st->core.param.cmd = MOTIONSENSE_CMD_SENSOR_RANGE;
91 st->core.param.sensor_range.data = val;
92
93
94 st->core.param.sensor_range.roundup = 1;
95
96 if (cros_ec_motion_send_host_cmd(&st->core, 0))
97 ret = -EIO;
98 break;
99 default:
100 ret = cros_ec_sensors_core_write(&st->core, chan, val, val2,
101 mask);
102 break;
103 }
104
105 mutex_unlock(&st->core.cmd_lock);
106
107 return ret;
108}
109
110static const struct iio_info cros_ec_baro_info = {
111 .read_raw = &cros_ec_baro_read,
112 .write_raw = &cros_ec_baro_write,
113};
114
115static int cros_ec_baro_probe(struct platform_device *pdev)
116{
117 struct device *dev = &pdev->dev;
118 struct cros_ec_dev *ec_dev = dev_get_drvdata(dev->parent);
119 struct iio_dev *indio_dev;
120 struct cros_ec_baro_state *state;
121 struct iio_chan_spec *channel;
122 int ret;
123
124 if (!ec_dev || !ec_dev->ec_dev) {
125 dev_warn(dev, "No CROS EC device found.\n");
126 return -EINVAL;
127 }
128
129 indio_dev = devm_iio_device_alloc(dev, sizeof(*state));
130 if (!indio_dev)
131 return -ENOMEM;
132
133 ret = cros_ec_sensors_core_init(pdev, indio_dev, true);
134 if (ret)
135 return ret;
136
137 indio_dev->info = &cros_ec_baro_info;
138 state = iio_priv(indio_dev);
139 state->core.type = state->core.resp->info.type;
140 state->core.loc = state->core.resp->info.location;
141 channel = state->channels;
142
143 channel->info_mask_separate = BIT(IIO_CHAN_INFO_RAW);
144 channel->info_mask_shared_by_all =
145 BIT(IIO_CHAN_INFO_SCALE) |
146 BIT(IIO_CHAN_INFO_SAMP_FREQ) |
147 BIT(IIO_CHAN_INFO_FREQUENCY);
148 channel->scan_type.realbits = CROS_EC_SENSOR_BITS;
149 channel->scan_type.storagebits = CROS_EC_SENSOR_BITS;
150 channel->scan_type.shift = 0;
151 channel->scan_index = 0;
152 channel->ext_info = cros_ec_sensors_ext_info;
153 channel->scan_type.sign = 'u';
154
155 state->core.calib[0] = 0;
156
157
158 switch (state->core.type) {
159 case MOTIONSENSE_TYPE_BARO:
160 channel->type = IIO_PRESSURE;
161 break;
162 default:
163 dev_warn(dev, "Unknown motion sensor\n");
164 return -EINVAL;
165 }
166
167
168 channel++;
169 channel->type = IIO_TIMESTAMP;
170 channel->channel = -1;
171 channel->scan_index = 1;
172 channel->scan_type.sign = 's';
173 channel->scan_type.realbits = 64;
174 channel->scan_type.storagebits = 64;
175
176 indio_dev->channels = state->channels;
177 indio_dev->num_channels = CROS_EC_BARO_MAX_CHANNELS;
178
179 state->core.read_ec_sensors_data = cros_ec_sensors_read_cmd;
180
181 ret = devm_iio_triggered_buffer_setup(dev, indio_dev, NULL,
182 cros_ec_sensors_capture, NULL);
183 if (ret)
184 return ret;
185
186 return devm_iio_device_register(dev, indio_dev);
187}
188
189static const struct platform_device_id cros_ec_baro_ids[] = {
190 {
191 .name = "cros-ec-baro",
192 },
193 { }
194};
195MODULE_DEVICE_TABLE(platform, cros_ec_baro_ids);
196
197static struct platform_driver cros_ec_baro_platform_driver = {
198 .driver = {
199 .name = "cros-ec-baro",
200 },
201 .probe = cros_ec_baro_probe,
202 .id_table = cros_ec_baro_ids,
203};
204module_platform_driver(cros_ec_baro_platform_driver);
205
206MODULE_DESCRIPTION("ChromeOS EC barometer sensor driver");
207MODULE_LICENSE("GPL v2");
208