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/buffer.h> 19 #include <linux/iio/kfifo_buf.h> 20 #include <linux/module.h> 21 #include <linux/platform_device.h> 22 #include <linux/slab.h> 23 #include "../common/ssp_sensors/ssp_iio_sensor.h" 24 25 #define SSP_CHANNEL_COUNT 3 26 27 #define SSP_GYROSCOPE_NAME "ssp-gyroscope" 28 static const char ssp_gyro_name[] = SSP_GYROSCOPE_NAME; 29 30 enum ssp_gyro_3d_channel { 31 SSP_CHANNEL_SCAN_INDEX_X, 32 SSP_CHANNEL_SCAN_INDEX_Y, 33 SSP_CHANNEL_SCAN_INDEX_Z, 34 SSP_CHANNEL_SCAN_INDEX_TIME, 35 }; 36 37 static int ssp_gyro_read_raw(struct iio_dev *indio_dev, 38 struct iio_chan_spec const *chan, int *val, 39 int *val2, long mask) 40 { 41 u32 t; 42 struct ssp_data *data = dev_get_drvdata(indio_dev->dev.parent->parent); 43 44 switch (mask) { 45 case IIO_CHAN_INFO_SAMP_FREQ: 46 t = ssp_get_sensor_delay(data, SSP_GYROSCOPE_SENSOR); 47 ssp_convert_to_freq(t, val, val2); 48 return IIO_VAL_INT_PLUS_MICRO; 49 default: 50 break; 51 } 52 53 return -EINVAL; 54 } 55 56 static int ssp_gyro_write_raw(struct iio_dev *indio_dev, 57 struct iio_chan_spec const *chan, int val, 58 int val2, long mask) 59 { 60 int ret; 61 struct ssp_data *data = dev_get_drvdata(indio_dev->dev.parent->parent); 62 63 switch (mask) { 64 case IIO_CHAN_INFO_SAMP_FREQ: 65 ret = ssp_convert_to_time(val, val2); 66 ret = ssp_change_delay(data, SSP_GYROSCOPE_SENSOR, ret); 67 if (ret < 0) 68 dev_err(&indio_dev->dev, "gyro sensor enable fail\n"); 69 70 return ret; 71 default: 72 break; 73 } 74 75 return -EINVAL; 76 } 77 78 static const struct iio_info ssp_gyro_iio_info = { 79 .read_raw = &ssp_gyro_read_raw, 80 .write_raw = &ssp_gyro_write_raw, 81 }; 82 83 static const unsigned long ssp_gyro_scan_mask[] = { 0x07, 0, }; 84 85 static const struct iio_chan_spec ssp_gyro_channels[] = { 86 SSP_CHANNEL_AG(IIO_ANGL_VEL, IIO_MOD_X, SSP_CHANNEL_SCAN_INDEX_X), 87 SSP_CHANNEL_AG(IIO_ANGL_VEL, IIO_MOD_Y, SSP_CHANNEL_SCAN_INDEX_Y), 88 SSP_CHANNEL_AG(IIO_ANGL_VEL, IIO_MOD_Z, SSP_CHANNEL_SCAN_INDEX_Z), 89 SSP_CHAN_TIMESTAMP(SSP_CHANNEL_SCAN_INDEX_TIME), 90 }; 91 92 static int ssp_process_gyro_data(struct iio_dev *indio_dev, void *buf, 93 int64_t timestamp) 94 { 95 return ssp_common_process_data(indio_dev, buf, SSP_GYROSCOPE_SIZE, 96 timestamp); 97 } 98 99 static const struct iio_buffer_setup_ops ssp_gyro_buffer_ops = { 100 .postenable = &ssp_common_buffer_postenable, 101 .postdisable = &ssp_common_buffer_postdisable, 102 }; 103 104 static int ssp_gyro_probe(struct platform_device *pdev) 105 { 106 int ret; 107 struct iio_dev *indio_dev; 108 struct ssp_sensor_data *spd; 109 struct iio_buffer *buffer; 110 111 indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*spd)); 112 if (!indio_dev) 113 return -ENOMEM; 114 115 spd = iio_priv(indio_dev); 116 117 spd->process_data = ssp_process_gyro_data; 118 spd->type = SSP_GYROSCOPE_SENSOR; 119 120 indio_dev->name = ssp_gyro_name; 121 indio_dev->dev.parent = &pdev->dev; 122 indio_dev->info = &ssp_gyro_iio_info; 123 indio_dev->modes = INDIO_BUFFER_SOFTWARE; 124 indio_dev->channels = ssp_gyro_channels; 125 indio_dev->num_channels = ARRAY_SIZE(ssp_gyro_channels); 126 indio_dev->available_scan_masks = ssp_gyro_scan_mask; 127 128 buffer = devm_iio_kfifo_allocate(&pdev->dev); 129 if (!buffer) 130 return -ENOMEM; 131 132 iio_device_attach_buffer(indio_dev, buffer); 133 134 indio_dev->setup_ops = &ssp_gyro_buffer_ops; 135 136 platform_set_drvdata(pdev, indio_dev); 137 138 ret = devm_iio_device_register(&pdev->dev, indio_dev); 139 if (ret < 0) 140 return ret; 141 142 /* ssp registering should be done after all iio setup */ 143 ssp_register_consumer(indio_dev, SSP_GYROSCOPE_SENSOR); 144 145 return 0; 146 } 147 148 static struct platform_driver ssp_gyro_driver = { 149 .driver = { 150 .name = SSP_GYROSCOPE_NAME, 151 }, 152 .probe = ssp_gyro_probe, 153 }; 154 155 module_platform_driver(ssp_gyro_driver); 156 157 MODULE_AUTHOR("Karol Wrona <k.wrona@samsung.com>"); 158 MODULE_DESCRIPTION("Samsung sensorhub gyroscopes driver"); 159 MODULE_LICENSE("GPL"); 160