1 /* 2 * cros_ec_light_prox - Driver for light and prox sensors behing CrosEC. 3 * 4 * Copyright (C) 2017 Google, Inc 5 * 6 * This software is licensed under the terms of the GNU General Public 7 * License version 2, as published by the Free Software Foundation, and 8 * may be copied, distributed, and modified under those terms. 9 * 10 * This program is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 * GNU General Public License for more details. 14 */ 15 16 #include <linux/delay.h> 17 #include <linux/device.h> 18 #include <linux/iio/buffer.h> 19 #include <linux/iio/common/cros_ec_sensors_core.h> 20 #include <linux/iio/iio.h> 21 #include <linux/iio/kfifo_buf.h> 22 #include <linux/iio/trigger.h> 23 #include <linux/iio/triggered_buffer.h> 24 #include <linux/iio/trigger_consumer.h> 25 #include <linux/kernel.h> 26 #include <linux/mfd/cros_ec.h> 27 #include <linux/mfd/cros_ec_commands.h> 28 #include <linux/module.h> 29 #include <linux/platform_device.h> 30 #include <linux/slab.h> 31 #include <linux/sysfs.h> 32 33 /* 34 * We only represent one entry for light or proximity. EC is merging different 35 * light sensors to return the what the eye would see. For proximity, we 36 * currently support only one light source. 37 */ 38 #define CROS_EC_LIGHT_PROX_MAX_CHANNELS (1 + 1) 39 40 /* State data for ec_sensors iio driver. */ 41 struct cros_ec_light_prox_state { 42 /* Shared by all sensors */ 43 struct cros_ec_sensors_core_state core; 44 45 struct iio_chan_spec channels[CROS_EC_LIGHT_PROX_MAX_CHANNELS]; 46 }; 47 48 static int cros_ec_light_prox_read(struct iio_dev *indio_dev, 49 struct iio_chan_spec const *chan, 50 int *val, int *val2, long mask) 51 { 52 struct cros_ec_light_prox_state *st = iio_priv(indio_dev); 53 u16 data = 0; 54 s64 val64; 55 int ret = IIO_VAL_INT; 56 int idx = chan->scan_index; 57 58 mutex_lock(&st->core.cmd_lock); 59 60 switch (mask) { 61 case IIO_CHAN_INFO_RAW: 62 if (chan->type == IIO_PROXIMITY) { 63 if (cros_ec_sensors_read_cmd(indio_dev, 1 << idx, 64 (s16 *)&data) < 0) { 65 ret = -EIO; 66 break; 67 } 68 *val = data; 69 } else { 70 ret = -EINVAL; 71 } 72 break; 73 case IIO_CHAN_INFO_PROCESSED: 74 if (chan->type == IIO_LIGHT) { 75 if (cros_ec_sensors_read_cmd(indio_dev, 1 << idx, 76 (s16 *)&data) < 0) { 77 ret = -EIO; 78 break; 79 } 80 /* 81 * The data coming from the light sensor is 82 * pre-processed and represents the ambient light 83 * illuminance reading expressed in lux. 84 */ 85 *val = data; 86 ret = IIO_VAL_INT; 87 } else { 88 ret = -EINVAL; 89 } 90 break; 91 case IIO_CHAN_INFO_CALIBBIAS: 92 st->core.param.cmd = MOTIONSENSE_CMD_SENSOR_OFFSET; 93 st->core.param.sensor_offset.flags = 0; 94 95 if (cros_ec_motion_send_host_cmd(&st->core, 0)) { 96 ret = -EIO; 97 break; 98 } 99 100 /* Save values */ 101 st->core.calib[0] = st->core.resp->sensor_offset.offset[0]; 102 103 *val = st->core.calib[idx]; 104 break; 105 case IIO_CHAN_INFO_CALIBSCALE: 106 /* 107 * RANGE is used for calibration 108 * scale is a number x.y, where x is coded on 16 bits, 109 * y coded on 16 bits, between 0 and 9999. 110 */ 111 st->core.param.cmd = MOTIONSENSE_CMD_SENSOR_RANGE; 112 st->core.param.sensor_range.data = EC_MOTION_SENSE_NO_VALUE; 113 114 if (cros_ec_motion_send_host_cmd(&st->core, 0)) { 115 ret = -EIO; 116 break; 117 } 118 119 val64 = st->core.resp->sensor_range.ret; 120 *val = val64 >> 16; 121 *val2 = (val64 & 0xffff) * 100; 122 ret = IIO_VAL_INT_PLUS_MICRO; 123 break; 124 default: 125 ret = cros_ec_sensors_core_read(&st->core, chan, val, val2, 126 mask); 127 break; 128 } 129 130 mutex_unlock(&st->core.cmd_lock); 131 132 return ret; 133 } 134 135 static int cros_ec_light_prox_write(struct iio_dev *indio_dev, 136 struct iio_chan_spec const *chan, 137 int val, int val2, long mask) 138 { 139 struct cros_ec_light_prox_state *st = iio_priv(indio_dev); 140 int ret = 0; 141 int idx = chan->scan_index; 142 143 mutex_lock(&st->core.cmd_lock); 144 145 switch (mask) { 146 case IIO_CHAN_INFO_CALIBBIAS: 147 st->core.calib[idx] = val; 148 /* Send to EC for each axis, even if not complete */ 149 st->core.param.cmd = MOTIONSENSE_CMD_SENSOR_OFFSET; 150 st->core.param.sensor_offset.flags = MOTION_SENSE_SET_OFFSET; 151 st->core.param.sensor_offset.offset[0] = st->core.calib[0]; 152 st->core.param.sensor_offset.temp = 153 EC_MOTION_SENSE_INVALID_CALIB_TEMP; 154 if (cros_ec_motion_send_host_cmd(&st->core, 0)) 155 ret = -EIO; 156 break; 157 case IIO_CHAN_INFO_CALIBSCALE: 158 st->core.param.cmd = MOTIONSENSE_CMD_SENSOR_RANGE; 159 st->core.param.sensor_range.data = (val << 16) | (val2 / 100); 160 if (cros_ec_motion_send_host_cmd(&st->core, 0)) 161 ret = -EIO; 162 break; 163 default: 164 ret = cros_ec_sensors_core_write(&st->core, chan, val, val2, 165 mask); 166 break; 167 } 168 169 mutex_unlock(&st->core.cmd_lock); 170 171 return ret; 172 } 173 174 static const struct iio_info cros_ec_light_prox_info = { 175 .read_raw = &cros_ec_light_prox_read, 176 .write_raw = &cros_ec_light_prox_write, 177 }; 178 179 static int cros_ec_light_prox_probe(struct platform_device *pdev) 180 { 181 struct device *dev = &pdev->dev; 182 struct cros_ec_dev *ec_dev = dev_get_drvdata(dev->parent); 183 struct iio_dev *indio_dev; 184 struct cros_ec_light_prox_state *state; 185 struct iio_chan_spec *channel; 186 int ret; 187 188 if (!ec_dev || !ec_dev->ec_dev) { 189 dev_warn(dev, "No CROS EC device found.\n"); 190 return -EINVAL; 191 } 192 193 indio_dev = devm_iio_device_alloc(dev, sizeof(*state)); 194 if (!indio_dev) 195 return -ENOMEM; 196 197 ret = cros_ec_sensors_core_init(pdev, indio_dev, true); 198 if (ret) 199 return ret; 200 201 indio_dev->info = &cros_ec_light_prox_info; 202 state = iio_priv(indio_dev); 203 state->core.type = state->core.resp->info.type; 204 state->core.loc = state->core.resp->info.location; 205 channel = state->channels; 206 207 /* Common part */ 208 channel->info_mask_shared_by_all = 209 BIT(IIO_CHAN_INFO_SAMP_FREQ) | 210 BIT(IIO_CHAN_INFO_FREQUENCY); 211 channel->scan_type.realbits = CROS_EC_SENSOR_BITS; 212 channel->scan_type.storagebits = CROS_EC_SENSOR_BITS; 213 channel->scan_type.shift = 0; 214 channel->scan_index = 0; 215 channel->ext_info = cros_ec_sensors_ext_info; 216 channel->scan_type.sign = 'u'; 217 218 state->core.calib[0] = 0; 219 220 /* Sensor specific */ 221 switch (state->core.type) { 222 case MOTIONSENSE_TYPE_LIGHT: 223 channel->type = IIO_LIGHT; 224 channel->info_mask_separate = 225 BIT(IIO_CHAN_INFO_PROCESSED) | 226 BIT(IIO_CHAN_INFO_CALIBBIAS) | 227 BIT(IIO_CHAN_INFO_CALIBSCALE); 228 break; 229 case MOTIONSENSE_TYPE_PROX: 230 channel->type = IIO_PROXIMITY; 231 channel->info_mask_separate = 232 BIT(IIO_CHAN_INFO_RAW) | 233 BIT(IIO_CHAN_INFO_CALIBBIAS) | 234 BIT(IIO_CHAN_INFO_CALIBSCALE); 235 break; 236 default: 237 dev_warn(dev, "Unknown motion sensor\n"); 238 return -EINVAL; 239 } 240 241 /* Timestamp */ 242 channel++; 243 channel->type = IIO_TIMESTAMP; 244 channel->channel = -1; 245 channel->scan_index = 1; 246 channel->scan_type.sign = 's'; 247 channel->scan_type.realbits = 64; 248 channel->scan_type.storagebits = 64; 249 250 indio_dev->channels = state->channels; 251 252 indio_dev->num_channels = CROS_EC_LIGHT_PROX_MAX_CHANNELS; 253 254 state->core.read_ec_sensors_data = cros_ec_sensors_read_cmd; 255 256 ret = devm_iio_triggered_buffer_setup(dev, indio_dev, NULL, 257 cros_ec_sensors_capture, NULL); 258 if (ret) 259 return ret; 260 261 return devm_iio_device_register(dev, indio_dev); 262 } 263 264 static const struct platform_device_id cros_ec_light_prox_ids[] = { 265 { 266 .name = "cros-ec-prox", 267 }, 268 { 269 .name = "cros-ec-light", 270 }, 271 { /* sentinel */ } 272 }; 273 MODULE_DEVICE_TABLE(platform, cros_ec_light_prox_ids); 274 275 static struct platform_driver cros_ec_light_prox_platform_driver = { 276 .driver = { 277 .name = "cros-ec-light-prox", 278 .pm = &cros_ec_sensors_pm_ops, 279 }, 280 .probe = cros_ec_light_prox_probe, 281 .id_table = cros_ec_light_prox_ids, 282 }; 283 module_platform_driver(cros_ec_light_prox_platform_driver); 284 285 MODULE_DESCRIPTION("ChromeOS EC light/proximity sensors driver"); 286 MODULE_LICENSE("GPL v2"); 287