1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  *  Copyright (C) 2014, Samsung Electronics Co. Ltd. All Rights Reserved.
4  */
5 
6 #include <linux/iio/common/ssp_sensors.h>
7 #include <linux/iio/iio.h>
8 #include <linux/iio/buffer.h>
9 #include <linux/iio/kfifo_buf.h>
10 #include <linux/module.h>
11 #include <linux/platform_device.h>
12 #include <linux/slab.h>
13 #include "../common/ssp_sensors/ssp_iio_sensor.h"
14 
15 #define SSP_CHANNEL_COUNT 3
16 
17 #define SSP_ACCEL_NAME "ssp-accelerometer"
18 static const char ssp_accel_device_name[] = SSP_ACCEL_NAME;
19 
20 enum ssp_accel_3d_channel {
21 	SSP_CHANNEL_SCAN_INDEX_X,
22 	SSP_CHANNEL_SCAN_INDEX_Y,
23 	SSP_CHANNEL_SCAN_INDEX_Z,
24 	SSP_CHANNEL_SCAN_INDEX_TIME,
25 };
26 
27 static int ssp_accel_read_raw(struct iio_dev *indio_dev,
28 			      struct iio_chan_spec const *chan,  int *val,
29 			      int *val2, long mask)
30 {
31 	u32 t;
32 	struct ssp_data *data = dev_get_drvdata(indio_dev->dev.parent->parent);
33 
34 	switch (mask) {
35 	case IIO_CHAN_INFO_SAMP_FREQ:
36 		t = ssp_get_sensor_delay(data, SSP_ACCELEROMETER_SENSOR);
37 		ssp_convert_to_freq(t, val, val2);
38 		return IIO_VAL_INT_PLUS_MICRO;
39 	default:
40 		break;
41 	}
42 
43 	return -EINVAL;
44 }
45 
46 static int ssp_accel_write_raw(struct iio_dev *indio_dev,
47 			       struct iio_chan_spec const *chan, int val,
48 			       int val2, long mask)
49 {
50 	int ret;
51 	struct ssp_data *data = dev_get_drvdata(indio_dev->dev.parent->parent);
52 
53 	switch (mask) {
54 	case IIO_CHAN_INFO_SAMP_FREQ:
55 		ret = ssp_convert_to_time(val, val2);
56 		ret = ssp_change_delay(data, SSP_ACCELEROMETER_SENSOR, ret);
57 		if (ret < 0)
58 			dev_err(&indio_dev->dev, "accel sensor enable fail\n");
59 
60 		return ret;
61 	default:
62 		break;
63 	}
64 
65 	return -EINVAL;
66 }
67 
68 static const struct iio_info ssp_accel_iio_info = {
69 	.read_raw = &ssp_accel_read_raw,
70 	.write_raw = &ssp_accel_write_raw,
71 };
72 
73 static const unsigned long ssp_accel_scan_mask[] = { 0x7, 0, };
74 
75 static const struct iio_chan_spec ssp_acc_channels[] = {
76 	SSP_CHANNEL_AG(IIO_ACCEL, IIO_MOD_X, SSP_CHANNEL_SCAN_INDEX_X),
77 	SSP_CHANNEL_AG(IIO_ACCEL, IIO_MOD_Y, SSP_CHANNEL_SCAN_INDEX_Y),
78 	SSP_CHANNEL_AG(IIO_ACCEL, IIO_MOD_Z, SSP_CHANNEL_SCAN_INDEX_Z),
79 	SSP_CHAN_TIMESTAMP(SSP_CHANNEL_SCAN_INDEX_TIME),
80 };
81 
82 static int ssp_process_accel_data(struct iio_dev *indio_dev, void *buf,
83 				  int64_t timestamp)
84 {
85 	return ssp_common_process_data(indio_dev, buf, SSP_ACCELEROMETER_SIZE,
86 				       timestamp);
87 }
88 
89 static const struct iio_buffer_setup_ops ssp_accel_buffer_ops = {
90 	.postenable = &ssp_common_buffer_postenable,
91 	.postdisable = &ssp_common_buffer_postdisable,
92 };
93 
94 static int ssp_accel_probe(struct platform_device *pdev)
95 {
96 	int ret;
97 	struct iio_dev *indio_dev;
98 	struct ssp_sensor_data *spd;
99 
100 	indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*spd));
101 	if (!indio_dev)
102 		return -ENOMEM;
103 
104 	spd = iio_priv(indio_dev);
105 
106 	spd->process_data = ssp_process_accel_data;
107 	spd->type = SSP_ACCELEROMETER_SENSOR;
108 
109 	indio_dev->name = ssp_accel_device_name;
110 	indio_dev->info = &ssp_accel_iio_info;
111 	indio_dev->channels = ssp_acc_channels;
112 	indio_dev->num_channels = ARRAY_SIZE(ssp_acc_channels);
113 	indio_dev->available_scan_masks = ssp_accel_scan_mask;
114 
115 	ret = devm_iio_kfifo_buffer_setup(&pdev->dev, indio_dev,
116 					  &ssp_accel_buffer_ops);
117 	if (ret)
118 		return ret;
119 
120 	platform_set_drvdata(pdev, indio_dev);
121 
122 	ret = devm_iio_device_register(&pdev->dev, indio_dev);
123 	if (ret < 0)
124 		return ret;
125 
126 	/* ssp registering should be done after all iio setup */
127 	ssp_register_consumer(indio_dev, SSP_ACCELEROMETER_SENSOR);
128 
129 	return 0;
130 }
131 
132 static struct platform_driver ssp_accel_driver = {
133 	.driver = {
134 		.name = SSP_ACCEL_NAME,
135 	},
136 	.probe = ssp_accel_probe,
137 };
138 
139 module_platform_driver(ssp_accel_driver);
140 
141 MODULE_AUTHOR("Karol Wrona <k.wrona@samsung.com>");
142 MODULE_DESCRIPTION("Samsung sensorhub accelerometers driver");
143 MODULE_LICENSE("GPL");
144 MODULE_IMPORT_NS(IIO_SSP_SENSORS);
145