1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * cros_ec_light_prox - Driver for light and prox sensors behing CrosEC. 4 * 5 * Copyright (C) 2017 Google, Inc 6 */ 7 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/module.h> 18 #include <linux/platform_data/cros_ec_commands.h> 19 #include <linux/platform_data/cros_ec_proto.h> 20 #include <linux/platform_device.h> 21 #include <linux/slab.h> 22 23 /* 24 * We only represent one entry for light or proximity. EC is merging different 25 * light sensors to return the what the eye would see. For proximity, we 26 * currently support only one light source. 27 */ 28 #define CROS_EC_LIGHT_PROX_MAX_CHANNELS (1 + 1) 29 30 /* State data for ec_sensors iio driver. */ 31 struct cros_ec_light_prox_state { 32 /* Shared by all sensors */ 33 struct cros_ec_sensors_core_state core; 34 35 struct iio_chan_spec channels[CROS_EC_LIGHT_PROX_MAX_CHANNELS]; 36 }; 37 38 static int cros_ec_light_prox_read(struct iio_dev *indio_dev, 39 struct iio_chan_spec const *chan, 40 int *val, int *val2, long mask) 41 { 42 struct cros_ec_light_prox_state *st = iio_priv(indio_dev); 43 u16 data = 0; 44 s64 val64; 45 int ret; 46 int idx = chan->scan_index; 47 48 mutex_lock(&st->core.cmd_lock); 49 50 switch (mask) { 51 case IIO_CHAN_INFO_RAW: 52 if (chan->type == IIO_PROXIMITY) { 53 ret = cros_ec_sensors_read_cmd(indio_dev, 1 << idx, 54 (s16 *)&data); 55 if (ret) 56 break; 57 *val = data; 58 ret = IIO_VAL_INT; 59 } else { 60 ret = -EINVAL; 61 } 62 break; 63 case IIO_CHAN_INFO_PROCESSED: 64 if (chan->type == IIO_LIGHT) { 65 ret = cros_ec_sensors_read_cmd(indio_dev, 1 << idx, 66 (s16 *)&data); 67 if (ret) 68 break; 69 /* 70 * The data coming from the light sensor is 71 * pre-processed and represents the ambient light 72 * illuminance reading expressed in lux. 73 */ 74 *val = data; 75 ret = IIO_VAL_INT; 76 } else { 77 ret = -EINVAL; 78 } 79 break; 80 case IIO_CHAN_INFO_CALIBBIAS: 81 st->core.param.cmd = MOTIONSENSE_CMD_SENSOR_OFFSET; 82 st->core.param.sensor_offset.flags = 0; 83 84 ret = cros_ec_motion_send_host_cmd(&st->core, 0); 85 if (ret) 86 break; 87 88 /* Save values */ 89 st->core.calib[0].offset = 90 st->core.resp->sensor_offset.offset[0]; 91 92 *val = st->core.calib[idx].offset; 93 ret = IIO_VAL_INT; 94 break; 95 case IIO_CHAN_INFO_CALIBSCALE: 96 /* 97 * RANGE is used for calibration 98 * scale is a number x.y, where x is coded on 16 bits, 99 * y coded on 16 bits, between 0 and 9999. 100 */ 101 st->core.param.cmd = MOTIONSENSE_CMD_SENSOR_RANGE; 102 st->core.param.sensor_range.data = EC_MOTION_SENSE_NO_VALUE; 103 104 ret = cros_ec_motion_send_host_cmd(&st->core, 0); 105 if (ret) 106 break; 107 108 val64 = st->core.resp->sensor_range.ret; 109 *val = val64 >> 16; 110 *val2 = (val64 & 0xffff) * 100; 111 ret = IIO_VAL_INT_PLUS_MICRO; 112 break; 113 default: 114 ret = cros_ec_sensors_core_read(&st->core, chan, val, val2, 115 mask); 116 break; 117 } 118 119 mutex_unlock(&st->core.cmd_lock); 120 121 return ret; 122 } 123 124 static int cros_ec_light_prox_write(struct iio_dev *indio_dev, 125 struct iio_chan_spec const *chan, 126 int val, int val2, long mask) 127 { 128 struct cros_ec_light_prox_state *st = iio_priv(indio_dev); 129 int ret; 130 int idx = chan->scan_index; 131 132 mutex_lock(&st->core.cmd_lock); 133 134 switch (mask) { 135 case IIO_CHAN_INFO_CALIBBIAS: 136 st->core.calib[idx].offset = val; 137 /* Send to EC for each axis, even if not complete */ 138 st->core.param.cmd = MOTIONSENSE_CMD_SENSOR_OFFSET; 139 st->core.param.sensor_offset.flags = MOTION_SENSE_SET_OFFSET; 140 st->core.param.sensor_offset.offset[0] = 141 st->core.calib[0].offset; 142 st->core.param.sensor_offset.temp = 143 EC_MOTION_SENSE_INVALID_CALIB_TEMP; 144 ret = cros_ec_motion_send_host_cmd(&st->core, 0); 145 break; 146 case IIO_CHAN_INFO_CALIBSCALE: 147 st->core.param.cmd = MOTIONSENSE_CMD_SENSOR_RANGE; 148 st->core.param.sensor_range.data = (val << 16) | (val2 / 100); 149 ret = cros_ec_motion_send_host_cmd(&st->core, 0); 150 break; 151 default: 152 ret = cros_ec_sensors_core_write(&st->core, chan, val, val2, 153 mask); 154 break; 155 } 156 157 mutex_unlock(&st->core.cmd_lock); 158 159 return ret; 160 } 161 162 static const struct iio_info cros_ec_light_prox_info = { 163 .read_raw = &cros_ec_light_prox_read, 164 .write_raw = &cros_ec_light_prox_write, 165 .read_avail = &cros_ec_sensors_core_read_avail, 166 }; 167 168 static int cros_ec_light_prox_probe(struct platform_device *pdev) 169 { 170 struct device *dev = &pdev->dev; 171 struct iio_dev *indio_dev; 172 struct cros_ec_light_prox_state *state; 173 struct iio_chan_spec *channel; 174 int ret; 175 176 indio_dev = devm_iio_device_alloc(dev, sizeof(*state)); 177 if (!indio_dev) 178 return -ENOMEM; 179 180 ret = cros_ec_sensors_core_init(pdev, indio_dev, true); 181 if (ret) 182 return ret; 183 184 indio_dev->info = &cros_ec_light_prox_info; 185 state = iio_priv(indio_dev); 186 state->core.type = state->core.resp->info.type; 187 state->core.loc = state->core.resp->info.location; 188 channel = state->channels; 189 190 /* Common part */ 191 channel->info_mask_shared_by_all = 192 BIT(IIO_CHAN_INFO_SAMP_FREQ) | 193 BIT(IIO_CHAN_INFO_FREQUENCY); 194 channel->info_mask_shared_by_all_available = 195 BIT(IIO_CHAN_INFO_SAMP_FREQ); 196 channel->scan_type.realbits = CROS_EC_SENSOR_BITS; 197 channel->scan_type.storagebits = CROS_EC_SENSOR_BITS; 198 channel->scan_type.shift = 0; 199 channel->scan_index = 0; 200 channel->ext_info = cros_ec_sensors_ext_info; 201 channel->scan_type.sign = 'u'; 202 203 /* Sensor specific */ 204 switch (state->core.type) { 205 case MOTIONSENSE_TYPE_LIGHT: 206 channel->type = IIO_LIGHT; 207 channel->info_mask_separate = 208 BIT(IIO_CHAN_INFO_PROCESSED) | 209 BIT(IIO_CHAN_INFO_CALIBBIAS) | 210 BIT(IIO_CHAN_INFO_CALIBSCALE); 211 break; 212 case MOTIONSENSE_TYPE_PROX: 213 channel->type = IIO_PROXIMITY; 214 channel->info_mask_separate = 215 BIT(IIO_CHAN_INFO_RAW) | 216 BIT(IIO_CHAN_INFO_CALIBBIAS) | 217 BIT(IIO_CHAN_INFO_CALIBSCALE); 218 break; 219 default: 220 dev_warn(dev, "Unknown motion sensor\n"); 221 return -EINVAL; 222 } 223 224 /* Timestamp */ 225 channel++; 226 channel->type = IIO_TIMESTAMP; 227 channel->channel = -1; 228 channel->scan_index = 1; 229 channel->scan_type.sign = 's'; 230 channel->scan_type.realbits = 64; 231 channel->scan_type.storagebits = 64; 232 233 indio_dev->channels = state->channels; 234 235 indio_dev->num_channels = CROS_EC_LIGHT_PROX_MAX_CHANNELS; 236 237 state->core.read_ec_sensors_data = cros_ec_sensors_read_cmd; 238 239 ret = devm_iio_triggered_buffer_setup(dev, indio_dev, NULL, 240 cros_ec_sensors_capture, NULL); 241 if (ret) 242 return ret; 243 244 return devm_iio_device_register(dev, indio_dev); 245 } 246 247 static const struct platform_device_id cros_ec_light_prox_ids[] = { 248 { 249 .name = "cros-ec-prox", 250 }, 251 { 252 .name = "cros-ec-light", 253 }, 254 { /* sentinel */ } 255 }; 256 MODULE_DEVICE_TABLE(platform, cros_ec_light_prox_ids); 257 258 static struct platform_driver cros_ec_light_prox_platform_driver = { 259 .driver = { 260 .name = "cros-ec-light-prox", 261 .pm = &cros_ec_sensors_pm_ops, 262 }, 263 .probe = cros_ec_light_prox_probe, 264 .id_table = cros_ec_light_prox_ids, 265 }; 266 module_platform_driver(cros_ec_light_prox_platform_driver); 267 268 MODULE_DESCRIPTION("ChromeOS EC light/proximity sensors driver"); 269 MODULE_LICENSE("GPL v2"); 270