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"); 169