Tiberiu Breana | 90bad33 | 2015-05-12 18:48:42 +0300 | [diff] [blame] | 1 | /** |
| 2 | * Sensortek STK8312 3-Axis Accelerometer |
| 3 | * |
| 4 | * Copyright (c) 2015, Intel Corporation. |
| 5 | * |
| 6 | * This file is subject to the terms and conditions of version 2 of |
| 7 | * the GNU General Public License. See the file COPYING in the main |
| 8 | * directory of this archive for more details. |
| 9 | * |
| 10 | * IIO driver for STK8312; 7-bit I2C address: 0x3D. |
| 11 | */ |
| 12 | |
| 13 | #include <linux/acpi.h> |
Tiberiu Breana | 95c12bb | 2015-06-24 17:01:48 +0300 | [diff] [blame] | 14 | #include <linux/gpio/consumer.h> |
Tiberiu Breana | 90bad33 | 2015-05-12 18:48:42 +0300 | [diff] [blame] | 15 | #include <linux/i2c.h> |
Tiberiu Breana | 95c12bb | 2015-06-24 17:01:48 +0300 | [diff] [blame] | 16 | #include <linux/interrupt.h> |
Tiberiu Breana | 90bad33 | 2015-05-12 18:48:42 +0300 | [diff] [blame] | 17 | #include <linux/kernel.h> |
| 18 | #include <linux/module.h> |
| 19 | #include <linux/delay.h> |
Tiberiu Breana | 95c12bb | 2015-06-24 17:01:48 +0300 | [diff] [blame] | 20 | #include <linux/iio/buffer.h> |
Tiberiu Breana | 90bad33 | 2015-05-12 18:48:42 +0300 | [diff] [blame] | 21 | #include <linux/iio/iio.h> |
| 22 | #include <linux/iio/sysfs.h> |
Tiberiu Breana | 95c12bb | 2015-06-24 17:01:48 +0300 | [diff] [blame] | 23 | #include <linux/iio/trigger.h> |
| 24 | #include <linux/iio/triggered_buffer.h> |
| 25 | #include <linux/iio/trigger_consumer.h> |
Tiberiu Breana | 90bad33 | 2015-05-12 18:48:42 +0300 | [diff] [blame] | 26 | |
| 27 | #define STK8312_REG_XOUT 0x00 |
| 28 | #define STK8312_REG_YOUT 0x01 |
| 29 | #define STK8312_REG_ZOUT 0x02 |
Tiberiu Breana | 95c12bb | 2015-06-24 17:01:48 +0300 | [diff] [blame] | 30 | #define STK8312_REG_INTSU 0x06 |
Tiberiu Breana | 90bad33 | 2015-05-12 18:48:42 +0300 | [diff] [blame] | 31 | #define STK8312_REG_MODE 0x07 |
Tiberiu Breana | 5e913d2 | 2015-06-24 17:01:49 +0300 | [diff] [blame^] | 32 | #define STK8312_REG_SR 0x08 |
Tiberiu Breana | 90bad33 | 2015-05-12 18:48:42 +0300 | [diff] [blame] | 33 | #define STK8312_REG_STH 0x13 |
| 34 | #define STK8312_REG_RESET 0x20 |
| 35 | #define STK8312_REG_AFECTRL 0x24 |
| 36 | #define STK8312_REG_OTPADDR 0x3D |
| 37 | #define STK8312_REG_OTPDATA 0x3E |
| 38 | #define STK8312_REG_OTPCTRL 0x3F |
| 39 | |
Tiberiu Breana | 95c12bb | 2015-06-24 17:01:48 +0300 | [diff] [blame] | 40 | #define STK8312_MODE_ACTIVE 0x01 |
| 41 | #define STK8312_MODE_STANDBY 0x00 |
| 42 | #define STK8312_DREADY_BIT 0x10 |
| 43 | #define STK8312_INT_MODE 0xC0 |
Tiberiu Breana | 90bad33 | 2015-05-12 18:48:42 +0300 | [diff] [blame] | 44 | #define STK8312_RNG_MASK 0xC0 |
Tiberiu Breana | 5e913d2 | 2015-06-24 17:01:49 +0300 | [diff] [blame^] | 45 | #define STK8312_SR_MASK 0x07 |
| 46 | #define STK8312_SR_400HZ_IDX 0 |
Tiberiu Breana | 90bad33 | 2015-05-12 18:48:42 +0300 | [diff] [blame] | 47 | #define STK8312_RNG_SHIFT 6 |
| 48 | #define STK8312_READ_RETRIES 16 |
Tiberiu Breana | 95c12bb | 2015-06-24 17:01:48 +0300 | [diff] [blame] | 49 | #define STK8312_ALL_CHANNEL_MASK 7 |
| 50 | #define STK8312_ALL_CHANNEL_SIZE 3 |
Tiberiu Breana | 90bad33 | 2015-05-12 18:48:42 +0300 | [diff] [blame] | 51 | |
| 52 | #define STK8312_DRIVER_NAME "stk8312" |
Tiberiu Breana | 95c12bb | 2015-06-24 17:01:48 +0300 | [diff] [blame] | 53 | #define STK8312_GPIO "stk8312_gpio" |
| 54 | #define STK8312_IRQ_NAME "stk8312_event" |
Tiberiu Breana | 90bad33 | 2015-05-12 18:48:42 +0300 | [diff] [blame] | 55 | |
| 56 | /* |
| 57 | * The accelerometer has two measurement ranges: |
| 58 | * |
| 59 | * -6g - +6g (8-bit, signed) |
| 60 | * -16g - +16g (8-bit, signed) |
| 61 | * |
| 62 | * scale1 = (6 + 6) * 9.81 / (2^8 - 1) = 0.4616 |
| 63 | * scale2 = (16 + 16) * 9.81 / (2^8 - 1) = 1.2311 |
| 64 | */ |
| 65 | #define STK8312_SCALE_AVAIL "0.4616 1.2311" |
| 66 | |
| 67 | static const int stk8312_scale_table[][2] = { |
| 68 | {0, 461600}, {1, 231100} |
| 69 | }; |
| 70 | |
Tiberiu Breana | 5e913d2 | 2015-06-24 17:01:49 +0300 | [diff] [blame^] | 71 | static const struct { |
| 72 | u16 val; |
| 73 | u32 val2; |
| 74 | } stk8312_samp_freq_table[] = { |
| 75 | {400, 0}, {200, 0}, {100, 0}, {50, 0}, {25, 0}, |
| 76 | {12, 500000}, {6, 250000}, {3, 125000} |
| 77 | }; |
| 78 | |
| 79 | #define STK8312_ACCEL_CHANNEL(index, reg, axis) { \ |
| 80 | .type = IIO_ACCEL, \ |
| 81 | .address = reg, \ |
| 82 | .modified = 1, \ |
| 83 | .channel2 = IIO_MOD_##axis, \ |
| 84 | .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ |
| 85 | .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) | \ |
| 86 | BIT(IIO_CHAN_INFO_SAMP_FREQ), \ |
| 87 | .scan_index = index, \ |
| 88 | .scan_type = { \ |
| 89 | .sign = 's', \ |
| 90 | .realbits = 8, \ |
| 91 | .storagebits = 8, \ |
| 92 | .endianness = IIO_CPU, \ |
| 93 | }, \ |
Tiberiu Breana | 90bad33 | 2015-05-12 18:48:42 +0300 | [diff] [blame] | 94 | } |
| 95 | |
| 96 | static const struct iio_chan_spec stk8312_channels[] = { |
Tiberiu Breana | 95c12bb | 2015-06-24 17:01:48 +0300 | [diff] [blame] | 97 | STK8312_ACCEL_CHANNEL(0, STK8312_REG_XOUT, X), |
| 98 | STK8312_ACCEL_CHANNEL(1, STK8312_REG_YOUT, Y), |
| 99 | STK8312_ACCEL_CHANNEL(2, STK8312_REG_ZOUT, Z), |
| 100 | IIO_CHAN_SOFT_TIMESTAMP(3), |
Tiberiu Breana | 90bad33 | 2015-05-12 18:48:42 +0300 | [diff] [blame] | 101 | }; |
| 102 | |
| 103 | struct stk8312_data { |
| 104 | struct i2c_client *client; |
| 105 | struct mutex lock; |
| 106 | int range; |
Tiberiu Breana | 5e913d2 | 2015-06-24 17:01:49 +0300 | [diff] [blame^] | 107 | u8 sample_rate_idx; |
Tiberiu Breana | 90bad33 | 2015-05-12 18:48:42 +0300 | [diff] [blame] | 108 | u8 mode; |
Tiberiu Breana | 95c12bb | 2015-06-24 17:01:48 +0300 | [diff] [blame] | 109 | struct iio_trigger *dready_trig; |
| 110 | bool dready_trigger_on; |
| 111 | s8 buffer[16]; /* 3x8-bit channels + 5x8 padding + 64-bit timestamp */ |
Tiberiu Breana | 90bad33 | 2015-05-12 18:48:42 +0300 | [diff] [blame] | 112 | }; |
| 113 | |
| 114 | static IIO_CONST_ATTR(in_accel_scale_available, STK8312_SCALE_AVAIL); |
| 115 | |
Tiberiu Breana | 5e913d2 | 2015-06-24 17:01:49 +0300 | [diff] [blame^] | 116 | static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("3.125 6.25 12.5 25 50 100 200 400"); |
| 117 | |
Tiberiu Breana | 90bad33 | 2015-05-12 18:48:42 +0300 | [diff] [blame] | 118 | static struct attribute *stk8312_attributes[] = { |
| 119 | &iio_const_attr_in_accel_scale_available.dev_attr.attr, |
Tiberiu Breana | 5e913d2 | 2015-06-24 17:01:49 +0300 | [diff] [blame^] | 120 | &iio_const_attr_sampling_frequency_available.dev_attr.attr, |
Tiberiu Breana | 90bad33 | 2015-05-12 18:48:42 +0300 | [diff] [blame] | 121 | NULL, |
| 122 | }; |
| 123 | |
| 124 | static const struct attribute_group stk8312_attribute_group = { |
| 125 | .attrs = stk8312_attributes |
| 126 | }; |
| 127 | |
| 128 | static int stk8312_otp_init(struct stk8312_data *data) |
| 129 | { |
| 130 | int ret; |
| 131 | int count = 10; |
| 132 | struct i2c_client *client = data->client; |
| 133 | |
| 134 | ret = i2c_smbus_write_byte_data(client, STK8312_REG_OTPADDR, 0x70); |
| 135 | if (ret < 0) |
| 136 | goto exit_err; |
| 137 | ret = i2c_smbus_write_byte_data(client, STK8312_REG_OTPCTRL, 0x02); |
| 138 | if (ret < 0) |
| 139 | goto exit_err; |
| 140 | |
| 141 | do { |
| 142 | usleep_range(1000, 5000); |
| 143 | ret = i2c_smbus_read_byte_data(client, STK8312_REG_OTPCTRL); |
| 144 | if (ret < 0) |
| 145 | goto exit_err; |
| 146 | count--; |
| 147 | } while (!(ret & 0x80) && count > 0); |
| 148 | |
| 149 | if (count == 0) |
| 150 | goto exit_err; |
| 151 | |
| 152 | ret = i2c_smbus_read_byte_data(client, STK8312_REG_OTPDATA); |
| 153 | if (ret < 0) |
| 154 | goto exit_err; |
| 155 | |
| 156 | ret = i2c_smbus_write_byte_data(data->client, |
| 157 | STK8312_REG_AFECTRL, ret); |
| 158 | if (ret < 0) |
| 159 | goto exit_err; |
| 160 | msleep(150); |
| 161 | |
| 162 | return ret; |
| 163 | |
| 164 | exit_err: |
| 165 | dev_err(&client->dev, "failed to initialize sensor\n"); |
| 166 | return ret; |
| 167 | } |
| 168 | |
| 169 | static int stk8312_set_mode(struct stk8312_data *data, u8 mode) |
| 170 | { |
| 171 | int ret; |
Tiberiu Breana | 90bad33 | 2015-05-12 18:48:42 +0300 | [diff] [blame] | 172 | struct i2c_client *client = data->client; |
| 173 | |
Tiberiu Breana | 95c12bb | 2015-06-24 17:01:48 +0300 | [diff] [blame] | 174 | if (mode == data->mode) |
Tiberiu Breana | 90bad33 | 2015-05-12 18:48:42 +0300 | [diff] [blame] | 175 | return 0; |
| 176 | |
Tiberiu Breana | 95c12bb | 2015-06-24 17:01:48 +0300 | [diff] [blame] | 177 | ret = i2c_smbus_write_byte_data(client, STK8312_REG_MODE, mode); |
Tiberiu Breana | 90bad33 | 2015-05-12 18:48:42 +0300 | [diff] [blame] | 178 | if (ret < 0) { |
| 179 | dev_err(&client->dev, "failed to change sensor mode\n"); |
| 180 | return ret; |
| 181 | } |
| 182 | |
| 183 | data->mode = mode; |
Tiberiu Breana | 95c12bb | 2015-06-24 17:01:48 +0300 | [diff] [blame] | 184 | if (mode & STK8312_MODE_ACTIVE) { |
Tiberiu Breana | 90bad33 | 2015-05-12 18:48:42 +0300 | [diff] [blame] | 185 | /* Need to run OTP sequence before entering active mode */ |
| 186 | usleep_range(1000, 5000); |
| 187 | ret = stk8312_otp_init(data); |
| 188 | } |
| 189 | |
| 190 | return ret; |
| 191 | } |
| 192 | |
Tiberiu Breana | 95c12bb | 2015-06-24 17:01:48 +0300 | [diff] [blame] | 193 | static int stk8312_set_interrupts(struct stk8312_data *data, u8 int_mask) |
| 194 | { |
| 195 | int ret; |
| 196 | u8 mode; |
| 197 | struct i2c_client *client = data->client; |
| 198 | |
| 199 | mode = data->mode; |
| 200 | /* We need to go in standby mode to modify registers */ |
| 201 | ret = stk8312_set_mode(data, STK8312_MODE_STANDBY); |
| 202 | if (ret < 0) |
| 203 | return ret; |
| 204 | |
| 205 | ret = i2c_smbus_write_byte_data(client, STK8312_REG_INTSU, int_mask); |
| 206 | if (ret < 0) |
| 207 | dev_err(&client->dev, "failed to set interrupts\n"); |
| 208 | |
| 209 | return stk8312_set_mode(data, mode); |
| 210 | } |
| 211 | |
| 212 | static int stk8312_data_rdy_trigger_set_state(struct iio_trigger *trig, |
| 213 | bool state) |
| 214 | { |
| 215 | struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig); |
| 216 | struct stk8312_data *data = iio_priv(indio_dev); |
| 217 | int ret; |
| 218 | |
| 219 | if (state) |
| 220 | ret = stk8312_set_interrupts(data, STK8312_DREADY_BIT); |
| 221 | else |
| 222 | ret = stk8312_set_interrupts(data, 0x00); |
| 223 | |
| 224 | if (ret < 0) { |
| 225 | dev_err(&data->client->dev, "failed to set trigger state\n"); |
| 226 | return ret; |
| 227 | } |
| 228 | |
| 229 | data->dready_trigger_on = state; |
| 230 | |
| 231 | return ret; |
| 232 | } |
| 233 | |
| 234 | static const struct iio_trigger_ops stk8312_trigger_ops = { |
| 235 | .set_trigger_state = stk8312_data_rdy_trigger_set_state, |
| 236 | .owner = THIS_MODULE, |
| 237 | }; |
| 238 | |
Tiberiu Breana | 5e913d2 | 2015-06-24 17:01:49 +0300 | [diff] [blame^] | 239 | static int stk8312_set_sample_rate(struct stk8312_data *data, int rate) |
| 240 | { |
| 241 | int ret; |
| 242 | u8 masked_reg; |
| 243 | u8 mode; |
| 244 | struct i2c_client *client = data->client; |
| 245 | |
| 246 | if (rate == data->sample_rate_idx) |
| 247 | return 0; |
| 248 | |
| 249 | mode = data->mode; |
| 250 | /* We need to go in standby mode to modify registers */ |
| 251 | ret = stk8312_set_mode(data, STK8312_MODE_STANDBY); |
| 252 | if (ret < 0) |
| 253 | return ret; |
| 254 | |
| 255 | ret = i2c_smbus_read_byte_data(client, STK8312_REG_SR); |
| 256 | if (ret < 0) { |
| 257 | dev_err(&client->dev, "failed to set sampling rate\n"); |
| 258 | return ret; |
| 259 | } |
| 260 | |
| 261 | masked_reg = (ret & (~STK8312_SR_MASK)) | rate; |
| 262 | |
| 263 | ret = i2c_smbus_write_byte_data(client, STK8312_REG_SR, masked_reg); |
| 264 | if (ret < 0) |
| 265 | dev_err(&client->dev, "failed to set sampling rate\n"); |
| 266 | else |
| 267 | data->sample_rate_idx = rate; |
| 268 | |
| 269 | return stk8312_set_mode(data, mode); |
| 270 | } |
| 271 | |
Tiberiu Breana | 90bad33 | 2015-05-12 18:48:42 +0300 | [diff] [blame] | 272 | static int stk8312_set_range(struct stk8312_data *data, u8 range) |
| 273 | { |
| 274 | int ret; |
| 275 | u8 masked_reg; |
| 276 | u8 mode; |
| 277 | struct i2c_client *client = data->client; |
| 278 | |
| 279 | if (range != 1 && range != 2) |
| 280 | return -EINVAL; |
| 281 | else if (range == data->range) |
| 282 | return 0; |
| 283 | |
| 284 | mode = data->mode; |
| 285 | /* We need to go in standby mode to modify registers */ |
| 286 | ret = stk8312_set_mode(data, STK8312_MODE_STANDBY); |
| 287 | if (ret < 0) |
| 288 | return ret; |
| 289 | |
| 290 | ret = i2c_smbus_read_byte_data(client, STK8312_REG_STH); |
| 291 | if (ret < 0) { |
| 292 | dev_err(&client->dev, "failed to change sensor range\n"); |
| 293 | return ret; |
| 294 | } |
| 295 | |
| 296 | masked_reg = ret & (~STK8312_RNG_MASK); |
| 297 | masked_reg |= range << STK8312_RNG_SHIFT; |
| 298 | |
| 299 | ret = i2c_smbus_write_byte_data(client, STK8312_REG_STH, masked_reg); |
| 300 | if (ret < 0) |
| 301 | dev_err(&client->dev, "failed to change sensor range\n"); |
| 302 | else |
| 303 | data->range = range; |
| 304 | |
| 305 | return stk8312_set_mode(data, mode); |
| 306 | } |
| 307 | |
| 308 | static int stk8312_read_accel(struct stk8312_data *data, u8 address) |
| 309 | { |
| 310 | int ret; |
| 311 | struct i2c_client *client = data->client; |
| 312 | |
| 313 | if (address > 2) |
| 314 | return -EINVAL; |
| 315 | |
| 316 | ret = i2c_smbus_read_byte_data(client, address); |
Tiberiu Breana | 95c12bb | 2015-06-24 17:01:48 +0300 | [diff] [blame] | 317 | if (ret < 0) |
Tiberiu Breana | 90bad33 | 2015-05-12 18:48:42 +0300 | [diff] [blame] | 318 | dev_err(&client->dev, "register read failed\n"); |
Tiberiu Breana | 90bad33 | 2015-05-12 18:48:42 +0300 | [diff] [blame] | 319 | |
Tiberiu Breana | 95c12bb | 2015-06-24 17:01:48 +0300 | [diff] [blame] | 320 | return ret; |
Tiberiu Breana | 90bad33 | 2015-05-12 18:48:42 +0300 | [diff] [blame] | 321 | } |
| 322 | |
| 323 | static int stk8312_read_raw(struct iio_dev *indio_dev, |
| 324 | struct iio_chan_spec const *chan, |
| 325 | int *val, int *val2, long mask) |
| 326 | { |
| 327 | struct stk8312_data *data = iio_priv(indio_dev); |
Tiberiu Breana | 95c12bb | 2015-06-24 17:01:48 +0300 | [diff] [blame] | 328 | int ret; |
Tiberiu Breana | 90bad33 | 2015-05-12 18:48:42 +0300 | [diff] [blame] | 329 | |
| 330 | switch (mask) { |
| 331 | case IIO_CHAN_INFO_RAW: |
Tiberiu Breana | 95c12bb | 2015-06-24 17:01:48 +0300 | [diff] [blame] | 332 | if (iio_buffer_enabled(indio_dev)) |
| 333 | return -EBUSY; |
Tiberiu Breana | 90bad33 | 2015-05-12 18:48:42 +0300 | [diff] [blame] | 334 | mutex_lock(&data->lock); |
Tiberiu Breana | 95c12bb | 2015-06-24 17:01:48 +0300 | [diff] [blame] | 335 | ret = stk8312_set_mode(data, data->mode | STK8312_MODE_ACTIVE); |
| 336 | if (ret < 0) { |
| 337 | mutex_unlock(&data->lock); |
| 338 | return -EINVAL; |
| 339 | } |
| 340 | ret = stk8312_read_accel(data, chan->address); |
| 341 | if (ret < 0) { |
| 342 | stk8312_set_mode(data, |
| 343 | data->mode & (~STK8312_MODE_ACTIVE)); |
| 344 | mutex_unlock(&data->lock); |
| 345 | return -EINVAL; |
| 346 | } |
| 347 | *val = sign_extend32(ret, 7); |
| 348 | stk8312_set_mode(data, data->mode & (~STK8312_MODE_ACTIVE)); |
Tiberiu Breana | 90bad33 | 2015-05-12 18:48:42 +0300 | [diff] [blame] | 349 | mutex_unlock(&data->lock); |
| 350 | return IIO_VAL_INT; |
| 351 | case IIO_CHAN_INFO_SCALE: |
| 352 | *val = stk8312_scale_table[data->range - 1][0]; |
| 353 | *val2 = stk8312_scale_table[data->range - 1][1]; |
| 354 | return IIO_VAL_INT_PLUS_MICRO; |
Tiberiu Breana | 5e913d2 | 2015-06-24 17:01:49 +0300 | [diff] [blame^] | 355 | case IIO_CHAN_INFO_SAMP_FREQ: |
| 356 | *val = stk8312_samp_freq_table[data->sample_rate_idx].val; |
| 357 | *val2 = stk8312_samp_freq_table[data->sample_rate_idx].val2; |
| 358 | return IIO_VAL_INT_PLUS_MICRO; |
Tiberiu Breana | 90bad33 | 2015-05-12 18:48:42 +0300 | [diff] [blame] | 359 | } |
| 360 | |
| 361 | return -EINVAL; |
| 362 | } |
| 363 | |
| 364 | static int stk8312_write_raw(struct iio_dev *indio_dev, |
| 365 | struct iio_chan_spec const *chan, |
| 366 | int val, int val2, long mask) |
| 367 | { |
| 368 | int i; |
| 369 | int index = -1; |
| 370 | int ret; |
| 371 | struct stk8312_data *data = iio_priv(indio_dev); |
| 372 | |
| 373 | switch (mask) { |
| 374 | case IIO_CHAN_INFO_SCALE: |
| 375 | for (i = 0; i < ARRAY_SIZE(stk8312_scale_table); i++) |
| 376 | if (val == stk8312_scale_table[i][0] && |
| 377 | val2 == stk8312_scale_table[i][1]) { |
| 378 | index = i + 1; |
| 379 | break; |
| 380 | } |
| 381 | if (index < 0) |
| 382 | return -EINVAL; |
| 383 | |
| 384 | mutex_lock(&data->lock); |
| 385 | ret = stk8312_set_range(data, index); |
| 386 | mutex_unlock(&data->lock); |
| 387 | |
| 388 | return ret; |
Tiberiu Breana | 5e913d2 | 2015-06-24 17:01:49 +0300 | [diff] [blame^] | 389 | case IIO_CHAN_INFO_SAMP_FREQ: |
| 390 | for (i = 0; i < ARRAY_SIZE(stk8312_samp_freq_table); i++) |
| 391 | if (val == stk8312_samp_freq_table[i].val && |
| 392 | val2 == stk8312_samp_freq_table[i].val2) { |
| 393 | index = i; |
| 394 | break; |
| 395 | } |
| 396 | if (index < 0) |
| 397 | return -EINVAL; |
| 398 | mutex_lock(&data->lock); |
| 399 | ret = stk8312_set_sample_rate(data, index); |
| 400 | mutex_unlock(&data->lock); |
| 401 | |
| 402 | return ret; |
Tiberiu Breana | 90bad33 | 2015-05-12 18:48:42 +0300 | [diff] [blame] | 403 | } |
| 404 | |
| 405 | return -EINVAL; |
| 406 | } |
| 407 | |
| 408 | static const struct iio_info stk8312_info = { |
| 409 | .driver_module = THIS_MODULE, |
| 410 | .read_raw = stk8312_read_raw, |
| 411 | .write_raw = stk8312_write_raw, |
| 412 | .attrs = &stk8312_attribute_group, |
| 413 | }; |
| 414 | |
Tiberiu Breana | 95c12bb | 2015-06-24 17:01:48 +0300 | [diff] [blame] | 415 | static irqreturn_t stk8312_trigger_handler(int irq, void *p) |
| 416 | { |
| 417 | struct iio_poll_func *pf = p; |
| 418 | struct iio_dev *indio_dev = pf->indio_dev; |
| 419 | struct stk8312_data *data = iio_priv(indio_dev); |
| 420 | int bit, ret, i = 0; |
| 421 | u8 buffer[STK8312_ALL_CHANNEL_SIZE]; |
| 422 | |
| 423 | mutex_lock(&data->lock); |
| 424 | /* |
| 425 | * Do a bulk read if all channels are requested, |
| 426 | * from 0x00 (XOUT) to 0x02 (ZOUT) |
| 427 | */ |
| 428 | if (*(indio_dev->active_scan_mask) == STK8312_ALL_CHANNEL_MASK) { |
| 429 | ret = i2c_smbus_read_i2c_block_data(data->client, |
| 430 | STK8312_REG_XOUT, |
| 431 | STK8312_ALL_CHANNEL_SIZE, |
| 432 | buffer); |
| 433 | if (ret < STK8312_ALL_CHANNEL_SIZE) { |
| 434 | dev_err(&data->client->dev, "register read failed\n"); |
| 435 | mutex_unlock(&data->lock); |
| 436 | goto err; |
| 437 | } |
| 438 | data->buffer[0] = buffer[0]; |
| 439 | data->buffer[1] = buffer[1]; |
| 440 | data->buffer[2] = buffer[2]; |
| 441 | } else { |
| 442 | for_each_set_bit(bit, indio_dev->active_scan_mask, |
| 443 | indio_dev->masklength) { |
| 444 | ret = stk8312_read_accel(data, bit); |
| 445 | if (ret < 0) { |
| 446 | mutex_unlock(&data->lock); |
| 447 | goto err; |
| 448 | } |
| 449 | data->buffer[i++] = ret; |
| 450 | } |
| 451 | } |
| 452 | mutex_unlock(&data->lock); |
| 453 | |
| 454 | iio_push_to_buffers_with_timestamp(indio_dev, data->buffer, |
| 455 | pf->timestamp); |
| 456 | err: |
| 457 | iio_trigger_notify_done(indio_dev->trig); |
| 458 | |
| 459 | return IRQ_HANDLED; |
| 460 | } |
| 461 | |
| 462 | static irqreturn_t stk8312_data_rdy_trig_poll(int irq, void *private) |
| 463 | { |
| 464 | struct iio_dev *indio_dev = private; |
| 465 | struct stk8312_data *data = iio_priv(indio_dev); |
| 466 | |
| 467 | if (data->dready_trigger_on) |
| 468 | iio_trigger_poll(data->dready_trig); |
| 469 | |
| 470 | return IRQ_HANDLED; |
| 471 | } |
| 472 | |
| 473 | static int stk8312_buffer_preenable(struct iio_dev *indio_dev) |
| 474 | { |
| 475 | struct stk8312_data *data = iio_priv(indio_dev); |
| 476 | |
| 477 | return stk8312_set_mode(data, data->mode | STK8312_MODE_ACTIVE); |
| 478 | } |
| 479 | |
| 480 | static int stk8312_buffer_postdisable(struct iio_dev *indio_dev) |
| 481 | { |
| 482 | struct stk8312_data *data = iio_priv(indio_dev); |
| 483 | |
| 484 | return stk8312_set_mode(data, data->mode & (~STK8312_MODE_ACTIVE)); |
| 485 | } |
| 486 | |
| 487 | static const struct iio_buffer_setup_ops stk8312_buffer_setup_ops = { |
| 488 | .preenable = stk8312_buffer_preenable, |
| 489 | .postenable = iio_triggered_buffer_postenable, |
| 490 | .predisable = iio_triggered_buffer_predisable, |
| 491 | .postdisable = stk8312_buffer_postdisable, |
| 492 | }; |
| 493 | |
| 494 | static int stk8312_gpio_probe(struct i2c_client *client) |
| 495 | { |
| 496 | struct device *dev; |
| 497 | struct gpio_desc *gpio; |
| 498 | int ret; |
| 499 | |
| 500 | if (!client) |
| 501 | return -EINVAL; |
| 502 | |
| 503 | dev = &client->dev; |
| 504 | |
| 505 | /* data ready gpio interrupt pin */ |
| 506 | gpio = devm_gpiod_get_index(dev, STK8312_GPIO, 0, GPIOD_IN); |
| 507 | if (IS_ERR(gpio)) { |
| 508 | dev_err(dev, "acpi gpio get index failed\n"); |
| 509 | return PTR_ERR(gpio); |
| 510 | } |
| 511 | |
| 512 | ret = gpiod_to_irq(gpio); |
| 513 | dev_dbg(dev, "GPIO resource, no:%d irq:%d\n", desc_to_gpio(gpio), ret); |
| 514 | |
| 515 | return ret; |
| 516 | } |
| 517 | |
Tiberiu Breana | 90bad33 | 2015-05-12 18:48:42 +0300 | [diff] [blame] | 518 | static int stk8312_probe(struct i2c_client *client, |
| 519 | const struct i2c_device_id *id) |
| 520 | { |
| 521 | int ret; |
| 522 | struct iio_dev *indio_dev; |
| 523 | struct stk8312_data *data; |
| 524 | |
| 525 | indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data)); |
| 526 | if (!indio_dev) { |
| 527 | dev_err(&client->dev, "iio allocation failed!\n"); |
| 528 | return -ENOMEM; |
| 529 | } |
| 530 | |
| 531 | data = iio_priv(indio_dev); |
| 532 | data->client = client; |
| 533 | i2c_set_clientdata(client, indio_dev); |
| 534 | mutex_init(&data->lock); |
| 535 | |
| 536 | indio_dev->dev.parent = &client->dev; |
| 537 | indio_dev->info = &stk8312_info; |
| 538 | indio_dev->name = STK8312_DRIVER_NAME; |
| 539 | indio_dev->modes = INDIO_DIRECT_MODE; |
| 540 | indio_dev->channels = stk8312_channels; |
| 541 | indio_dev->num_channels = ARRAY_SIZE(stk8312_channels); |
| 542 | |
| 543 | /* A software reset is recommended at power-on */ |
| 544 | ret = i2c_smbus_write_byte_data(data->client, STK8312_REG_RESET, 0x00); |
| 545 | if (ret < 0) { |
| 546 | dev_err(&client->dev, "failed to reset sensor\n"); |
| 547 | return ret; |
| 548 | } |
Tiberiu Breana | 5e913d2 | 2015-06-24 17:01:49 +0300 | [diff] [blame^] | 549 | data->sample_rate_idx = STK8312_SR_400HZ_IDX; |
Tiberiu Breana | 90bad33 | 2015-05-12 18:48:42 +0300 | [diff] [blame] | 550 | ret = stk8312_set_range(data, 1); |
| 551 | if (ret < 0) |
| 552 | return ret; |
| 553 | |
Tiberiu Breana | 95c12bb | 2015-06-24 17:01:48 +0300 | [diff] [blame] | 554 | ret = stk8312_set_mode(data, STK8312_INT_MODE | STK8312_MODE_ACTIVE); |
Tiberiu Breana | 90bad33 | 2015-05-12 18:48:42 +0300 | [diff] [blame] | 555 | if (ret < 0) |
| 556 | return ret; |
| 557 | |
Tiberiu Breana | 95c12bb | 2015-06-24 17:01:48 +0300 | [diff] [blame] | 558 | if (client->irq < 0) |
| 559 | client->irq = stk8312_gpio_probe(client); |
| 560 | |
| 561 | if (client->irq >= 0) { |
| 562 | ret = devm_request_threaded_irq(&client->dev, client->irq, |
| 563 | stk8312_data_rdy_trig_poll, |
| 564 | NULL, |
| 565 | IRQF_TRIGGER_RISING | |
| 566 | IRQF_ONESHOT, |
| 567 | STK8312_IRQ_NAME, |
| 568 | indio_dev); |
| 569 | if (ret < 0) { |
| 570 | dev_err(&client->dev, "request irq %d failed\n", |
| 571 | client->irq); |
| 572 | goto err_power_off; |
| 573 | } |
| 574 | |
| 575 | data->dready_trig = devm_iio_trigger_alloc(&client->dev, |
| 576 | "%s-dev%d", |
| 577 | indio_dev->name, |
| 578 | indio_dev->id); |
| 579 | if (!data->dready_trig) { |
| 580 | ret = -ENOMEM; |
| 581 | goto err_power_off; |
| 582 | } |
| 583 | |
| 584 | data->dready_trig->dev.parent = &client->dev; |
| 585 | data->dready_trig->ops = &stk8312_trigger_ops; |
| 586 | iio_trigger_set_drvdata(data->dready_trig, indio_dev); |
| 587 | ret = iio_trigger_register(data->dready_trig); |
| 588 | if (ret) { |
| 589 | dev_err(&client->dev, "iio trigger register failed\n"); |
| 590 | goto err_power_off; |
| 591 | } |
| 592 | } |
| 593 | |
| 594 | ret = iio_triggered_buffer_setup(indio_dev, |
| 595 | iio_pollfunc_store_time, |
| 596 | stk8312_trigger_handler, |
| 597 | &stk8312_buffer_setup_ops); |
| 598 | if (ret < 0) { |
| 599 | dev_err(&client->dev, "iio triggered buffer setup failed\n"); |
| 600 | goto err_trigger_unregister; |
| 601 | } |
| 602 | |
Tiberiu Breana | 90bad33 | 2015-05-12 18:48:42 +0300 | [diff] [blame] | 603 | ret = iio_device_register(indio_dev); |
| 604 | if (ret < 0) { |
| 605 | dev_err(&client->dev, "device_register failed\n"); |
Tiberiu Breana | 95c12bb | 2015-06-24 17:01:48 +0300 | [diff] [blame] | 606 | goto err_buffer_cleanup; |
Tiberiu Breana | 90bad33 | 2015-05-12 18:48:42 +0300 | [diff] [blame] | 607 | } |
| 608 | |
| 609 | return ret; |
Tiberiu Breana | 95c12bb | 2015-06-24 17:01:48 +0300 | [diff] [blame] | 610 | |
| 611 | err_buffer_cleanup: |
| 612 | iio_triggered_buffer_cleanup(indio_dev); |
| 613 | err_trigger_unregister: |
| 614 | if (data->dready_trig) |
| 615 | iio_trigger_unregister(data->dready_trig); |
| 616 | err_power_off: |
| 617 | stk8312_set_mode(data, STK8312_MODE_STANDBY); |
| 618 | return ret; |
Tiberiu Breana | 90bad33 | 2015-05-12 18:48:42 +0300 | [diff] [blame] | 619 | } |
| 620 | |
| 621 | static int stk8312_remove(struct i2c_client *client) |
| 622 | { |
| 623 | struct iio_dev *indio_dev = i2c_get_clientdata(client); |
Tiberiu Breana | 95c12bb | 2015-06-24 17:01:48 +0300 | [diff] [blame] | 624 | struct stk8312_data *data = iio_priv(indio_dev); |
Tiberiu Breana | 90bad33 | 2015-05-12 18:48:42 +0300 | [diff] [blame] | 625 | |
| 626 | iio_device_unregister(indio_dev); |
Tiberiu Breana | 95c12bb | 2015-06-24 17:01:48 +0300 | [diff] [blame] | 627 | iio_triggered_buffer_cleanup(indio_dev); |
Tiberiu Breana | 90bad33 | 2015-05-12 18:48:42 +0300 | [diff] [blame] | 628 | |
Tiberiu Breana | 95c12bb | 2015-06-24 17:01:48 +0300 | [diff] [blame] | 629 | if (data->dready_trig) |
| 630 | iio_trigger_unregister(data->dready_trig); |
| 631 | |
| 632 | return stk8312_set_mode(data, STK8312_MODE_STANDBY); |
Tiberiu Breana | 90bad33 | 2015-05-12 18:48:42 +0300 | [diff] [blame] | 633 | } |
| 634 | |
| 635 | #ifdef CONFIG_PM_SLEEP |
| 636 | static int stk8312_suspend(struct device *dev) |
| 637 | { |
| 638 | struct stk8312_data *data; |
| 639 | |
| 640 | data = iio_priv(i2c_get_clientdata(to_i2c_client(dev))); |
| 641 | |
Tiberiu Breana | 95c12bb | 2015-06-24 17:01:48 +0300 | [diff] [blame] | 642 | return stk8312_set_mode(data, data->mode & (~STK8312_MODE_ACTIVE)); |
Tiberiu Breana | 90bad33 | 2015-05-12 18:48:42 +0300 | [diff] [blame] | 643 | } |
| 644 | |
| 645 | static int stk8312_resume(struct device *dev) |
| 646 | { |
| 647 | struct stk8312_data *data; |
| 648 | |
| 649 | data = iio_priv(i2c_get_clientdata(to_i2c_client(dev))); |
| 650 | |
Tiberiu Breana | 95c12bb | 2015-06-24 17:01:48 +0300 | [diff] [blame] | 651 | return stk8312_set_mode(data, data->mode | STK8312_MODE_ACTIVE); |
Tiberiu Breana | 90bad33 | 2015-05-12 18:48:42 +0300 | [diff] [blame] | 652 | } |
| 653 | |
| 654 | static SIMPLE_DEV_PM_OPS(stk8312_pm_ops, stk8312_suspend, stk8312_resume); |
| 655 | |
| 656 | #define STK8312_PM_OPS (&stk8312_pm_ops) |
| 657 | #else |
| 658 | #define STK8312_PM_OPS NULL |
| 659 | #endif |
| 660 | |
| 661 | static const struct i2c_device_id stk8312_i2c_id[] = { |
| 662 | {"STK8312", 0}, |
| 663 | {} |
| 664 | }; |
| 665 | |
| 666 | static const struct acpi_device_id stk8312_acpi_id[] = { |
| 667 | {"STK8312", 0}, |
| 668 | {} |
| 669 | }; |
| 670 | |
| 671 | MODULE_DEVICE_TABLE(acpi, stk8312_acpi_id); |
| 672 | |
| 673 | static struct i2c_driver stk8312_driver = { |
| 674 | .driver = { |
| 675 | .name = "stk8312", |
| 676 | .pm = STK8312_PM_OPS, |
| 677 | .acpi_match_table = ACPI_PTR(stk8312_acpi_id), |
| 678 | }, |
| 679 | .probe = stk8312_probe, |
| 680 | .remove = stk8312_remove, |
| 681 | .id_table = stk8312_i2c_id, |
| 682 | }; |
| 683 | |
| 684 | module_i2c_driver(stk8312_driver); |
| 685 | |
| 686 | MODULE_AUTHOR("Tiberiu Breana <tiberiu.a.breana@intel.com>"); |
| 687 | MODULE_DESCRIPTION("STK8312 3-Axis Accelerometer driver"); |
| 688 | MODULE_LICENSE("GPL v2"); |