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a9afcaa6 KW |
1 | /* |
2 | * Copyright (C) 2014, Samsung Electronics Co. Ltd. All Rights Reserved. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License as published by | |
6 | * the Free Software Foundation; either version 2 of the License, or | |
7 | * (at your option) any later version. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | * | |
14 | */ | |
15 | ||
16 | #include <linux/iio/common/ssp_sensors.h> | |
17 | #include <linux/iio/iio.h> | |
18 | #include <linux/iio/kfifo_buf.h> | |
19 | #include <linux/module.h> | |
20 | #include <linux/platform_device.h> | |
21 | #include <linux/slab.h> | |
22 | #include "../common/ssp_sensors/ssp_iio_sensor.h" | |
23 | ||
24 | #define SSP_CHANNEL_COUNT 3 | |
25 | ||
26 | #define SSP_GYROSCOPE_NAME "ssp-gyroscope" | |
27 | static const char ssp_gyro_name[] = SSP_GYROSCOPE_NAME; | |
28 | ||
29 | enum ssp_gyro_3d_channel { | |
30 | SSP_CHANNEL_SCAN_INDEX_X, | |
31 | SSP_CHANNEL_SCAN_INDEX_Y, | |
32 | SSP_CHANNEL_SCAN_INDEX_Z, | |
33 | SSP_CHANNEL_SCAN_INDEX_TIME, | |
34 | }; | |
35 | ||
36 | static int ssp_gyro_read_raw(struct iio_dev *indio_dev, | |
37 | struct iio_chan_spec const *chan, int *val, | |
38 | int *val2, long mask) | |
39 | { | |
40 | u32 t; | |
41 | struct ssp_data *data = dev_get_drvdata(indio_dev->dev.parent->parent); | |
42 | ||
43 | switch (mask) { | |
44 | case IIO_CHAN_INFO_SAMP_FREQ: | |
45 | t = ssp_get_sensor_delay(data, SSP_GYROSCOPE_SENSOR); | |
46 | ssp_convert_to_freq(t, val, val2); | |
47 | return IIO_VAL_INT_PLUS_MICRO; | |
48 | default: | |
49 | break; | |
50 | } | |
51 | ||
52 | return -EINVAL; | |
53 | } | |
54 | ||
55 | static int ssp_gyro_write_raw(struct iio_dev *indio_dev, | |
56 | struct iio_chan_spec const *chan, int val, | |
57 | int val2, long mask) | |
58 | { | |
59 | int ret; | |
60 | struct ssp_data *data = dev_get_drvdata(indio_dev->dev.parent->parent); | |
61 | ||
62 | switch (mask) { | |
63 | case IIO_CHAN_INFO_SAMP_FREQ: | |
64 | ret = ssp_convert_to_time(val, val2); | |
65 | ret = ssp_change_delay(data, SSP_GYROSCOPE_SENSOR, ret); | |
66 | if (ret < 0) | |
67 | dev_err(&indio_dev->dev, "gyro sensor enable fail\n"); | |
68 | ||
69 | return ret; | |
70 | default: | |
71 | break; | |
72 | } | |
73 | ||
74 | return -EINVAL; | |
75 | } | |
76 | ||
77 | static struct iio_info ssp_gyro_iio_info = { | |
78 | .read_raw = &ssp_gyro_read_raw, | |
79 | .write_raw = &ssp_gyro_write_raw, | |
80 | }; | |
81 | ||
82 | static const unsigned long ssp_gyro_scan_mask[] = { 0x07, 0, }; | |
83 | ||
84 | static const struct iio_chan_spec ssp_gyro_channels[] = { | |
85 | SSP_CHANNEL_AG(IIO_ANGL_VEL, IIO_MOD_X, SSP_CHANNEL_SCAN_INDEX_X), | |
86 | SSP_CHANNEL_AG(IIO_ANGL_VEL, IIO_MOD_Y, SSP_CHANNEL_SCAN_INDEX_Y), | |
87 | SSP_CHANNEL_AG(IIO_ANGL_VEL, IIO_MOD_Z, SSP_CHANNEL_SCAN_INDEX_Z), | |
88 | SSP_CHAN_TIMESTAMP(SSP_CHANNEL_SCAN_INDEX_TIME), | |
89 | }; | |
90 | ||
91 | static int ssp_process_gyro_data(struct iio_dev *indio_dev, void *buf, | |
92 | int64_t timestamp) | |
93 | { | |
94 | return ssp_common_process_data(indio_dev, buf, SSP_GYROSCOPE_SIZE, | |
95 | timestamp); | |
96 | } | |
97 | ||
98 | static const struct iio_buffer_setup_ops ssp_gyro_buffer_ops = { | |
99 | .postenable = &ssp_common_buffer_postenable, | |
100 | .postdisable = &ssp_common_buffer_postdisable, | |
101 | }; | |
102 | ||
103 | static int ssp_gyro_probe(struct platform_device *pdev) | |
104 | { | |
105 | int ret; | |
106 | struct iio_dev *indio_dev; | |
107 | struct ssp_sensor_data *spd; | |
108 | struct iio_buffer *buffer; | |
109 | ||
110 | indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*spd)); | |
111 | if (!indio_dev) | |
112 | return -ENOMEM; | |
113 | ||
114 | spd = iio_priv(indio_dev); | |
115 | ||
116 | spd->process_data = ssp_process_gyro_data; | |
117 | spd->type = SSP_GYROSCOPE_SENSOR; | |
118 | ||
119 | indio_dev->name = ssp_gyro_name; | |
120 | indio_dev->dev.parent = &pdev->dev; | |
121 | indio_dev->info = &ssp_gyro_iio_info; | |
122 | indio_dev->modes = INDIO_BUFFER_SOFTWARE; | |
123 | indio_dev->channels = ssp_gyro_channels; | |
124 | indio_dev->num_channels = ARRAY_SIZE(ssp_gyro_channels); | |
125 | indio_dev->available_scan_masks = ssp_gyro_scan_mask; | |
126 | ||
127 | buffer = devm_iio_kfifo_allocate(&pdev->dev); | |
128 | if (!buffer) | |
129 | return -ENOMEM; | |
130 | ||
131 | iio_device_attach_buffer(indio_dev, buffer); | |
132 | ||
133 | indio_dev->setup_ops = &ssp_gyro_buffer_ops; | |
134 | ||
135 | platform_set_drvdata(pdev, indio_dev); | |
136 | ||
137 | ret = iio_device_register(indio_dev); | |
138 | if (ret < 0) | |
139 | return ret; | |
140 | ||
141 | /* ssp registering should be done after all iio setup */ | |
142 | ssp_register_consumer(indio_dev, SSP_GYROSCOPE_SENSOR); | |
143 | ||
144 | return 0; | |
145 | } | |
146 | ||
147 | static int ssp_gyro_remove(struct platform_device *pdev) | |
148 | { | |
149 | struct iio_dev *indio_dev = platform_get_drvdata(pdev); | |
150 | ||
151 | iio_device_unregister(indio_dev); | |
152 | ||
153 | return 0; | |
154 | } | |
155 | ||
156 | static struct platform_driver ssp_gyro_driver = { | |
157 | .driver = { | |
158 | .name = SSP_GYROSCOPE_NAME, | |
159 | }, | |
160 | .probe = ssp_gyro_probe, | |
161 | .remove = ssp_gyro_remove, | |
162 | }; | |
163 | ||
164 | module_platform_driver(ssp_gyro_driver); | |
165 | ||
166 | MODULE_AUTHOR("Karol Wrona <k.wrona@samsung.com>"); | |
167 | MODULE_DESCRIPTION("Samsung sensorhub gyroscopes driver"); | |
168 | MODULE_LICENSE("GPL"); |