Vlad Dogaru | c78b917 | 2014-11-24 11:43:15 +0200 | [diff] [blame] | 1 | /* |
| 2 | * Freescale MMA9551L Intelligent Motion-Sensing Platform driver |
| 3 | * Copyright (c) 2014, Intel Corporation. |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify it |
| 6 | * under the terms and conditions of the GNU General Public License, |
| 7 | * version 2, as published by the Free Software Foundation. |
| 8 | * |
| 9 | * This program is distributed in the hope it will be useful, but WITHOUT |
| 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| 12 | * more details. |
| 13 | */ |
| 14 | |
| 15 | #include <linux/module.h> |
| 16 | #include <linux/i2c.h> |
| 17 | #include <linux/interrupt.h> |
| 18 | #include <linux/slab.h> |
| 19 | #include <linux/acpi.h> |
| 20 | #include <linux/delay.h> |
| 21 | #include <linux/gpio/consumer.h> |
| 22 | #include <linux/iio/iio.h> |
| 23 | #include <linux/iio/sysfs.h> |
| 24 | #include <linux/iio/events.h> |
| 25 | |
| 26 | #define MMA9551_DRV_NAME "mma9551" |
| 27 | #define MMA9551_IRQ_NAME "mma9551_event" |
| 28 | #define MMA9551_GPIO_NAME "mma9551_int" |
| 29 | #define MMA9551_GPIO_COUNT 4 |
| 30 | |
| 31 | /* Applications IDs */ |
| 32 | #define MMA9551_APPID_VERSION 0x00 |
| 33 | #define MMA9551_APPID_GPIO 0x03 |
| 34 | #define MMA9551_APPID_AFE 0x06 |
| 35 | #define MMA9551_APPID_TILT 0x0B |
| 36 | #define MMA9551_APPID_SLEEP_WAKE 0x12 |
| 37 | #define MMA9551_APPID_RESET 0x17 |
| 38 | #define MMA9551_APPID_NONE 0xff |
| 39 | |
| 40 | /* Command masks for mailbox write command */ |
| 41 | #define MMA9551_CMD_READ_VERSION_INFO 0x00 |
| 42 | #define MMA9551_CMD_READ_CONFIG 0x10 |
| 43 | #define MMA9551_CMD_WRITE_CONFIG 0x20 |
| 44 | #define MMA9551_CMD_READ_STATUS 0x30 |
| 45 | |
| 46 | enum mma9551_gpio_pin { |
| 47 | mma9551_gpio6 = 0, |
| 48 | mma9551_gpio7, |
| 49 | mma9551_gpio8, |
| 50 | mma9551_gpio9, |
| 51 | mma9551_gpio_max = mma9551_gpio9, |
| 52 | }; |
| 53 | |
| 54 | /* Mailbox read command */ |
| 55 | #define MMA9551_RESPONSE_COCO BIT(7) |
| 56 | |
| 57 | /* Error-Status codes returned in mailbox read command */ |
| 58 | #define MMA9551_MCI_ERROR_NONE 0x00 |
| 59 | #define MMA9551_MCI_ERROR_PARAM 0x04 |
| 60 | #define MMA9551_MCI_INVALID_COUNT 0x19 |
| 61 | #define MMA9551_MCI_ERROR_COMMAND 0x1C |
| 62 | #define MMA9551_MCI_ERROR_INVALID_LENGTH 0x21 |
| 63 | #define MMA9551_MCI_ERROR_FIFO_BUSY 0x22 |
| 64 | #define MMA9551_MCI_ERROR_FIFO_ALLOCATED 0x23 |
| 65 | #define MMA9551_MCI_ERROR_FIFO_OVERSIZE 0x24 |
| 66 | |
| 67 | /* GPIO Application */ |
| 68 | #define MMA9551_GPIO_POL_MSB 0x08 |
| 69 | #define MMA9551_GPIO_POL_LSB 0x09 |
| 70 | |
| 71 | /* Sleep/Wake application */ |
| 72 | #define MMA9551_SLEEP_CFG 0x06 |
| 73 | #define MMA9551_SLEEP_CFG_SNCEN BIT(0) |
| 74 | #define MMA9551_SLEEP_CFG_SCHEN BIT(2) |
| 75 | |
| 76 | /* AFE application */ |
| 77 | #define MMA9551_AFE_X_ACCEL_REG 0x00 |
| 78 | #define MMA9551_AFE_Y_ACCEL_REG 0x02 |
| 79 | #define MMA9551_AFE_Z_ACCEL_REG 0x04 |
| 80 | |
| 81 | /* Tilt application (inclination in IIO terms). */ |
| 82 | #define MMA9551_TILT_XZ_ANG_REG 0x00 |
| 83 | #define MMA9551_TILT_YZ_ANG_REG 0x01 |
| 84 | #define MMA9551_TILT_XY_ANG_REG 0x02 |
| 85 | #define MMA9551_TILT_ANGFLG BIT(7) |
| 86 | #define MMA9551_TILT_QUAD_REG 0x03 |
| 87 | #define MMA9551_TILT_XY_QUAD_SHIFT 0 |
| 88 | #define MMA9551_TILT_YZ_QUAD_SHIFT 2 |
| 89 | #define MMA9551_TILT_XZ_QUAD_SHIFT 4 |
| 90 | #define MMA9551_TILT_CFG_REG 0x01 |
| 91 | #define MMA9551_TILT_ANG_THRESH_MASK GENMASK(3, 0) |
| 92 | |
| 93 | /* Tilt events are mapped to the first three GPIO pins. */ |
| 94 | enum mma9551_tilt_axis { |
| 95 | mma9551_x = 0, |
| 96 | mma9551_y, |
| 97 | mma9551_z, |
| 98 | }; |
| 99 | |
| 100 | /* |
| 101 | * A response is composed of: |
| 102 | * - control registers: MB0-3 |
| 103 | * - data registers: MB4-31 |
| 104 | * |
| 105 | * A request is composed of: |
| 106 | * - mbox to write to (always 0) |
| 107 | * - control registers: MB1-4 |
| 108 | * - data registers: MB5-31 |
| 109 | */ |
| 110 | #define MMA9551_MAILBOX_CTRL_REGS 4 |
| 111 | #define MMA9551_MAX_MAILBOX_DATA_REGS 28 |
| 112 | #define MMA9551_MAILBOX_REGS 32 |
| 113 | |
| 114 | #define MMA9551_I2C_READ_RETRIES 5 |
| 115 | #define MMA9551_I2C_READ_DELAY 50 /* us */ |
| 116 | |
| 117 | struct mma9551_mbox_request { |
| 118 | u8 start_mbox; /* Always 0. */ |
| 119 | u8 app_id; |
| 120 | /* |
| 121 | * See Section 5.3.1 of the MMA955xL Software Reference Manual. |
| 122 | * |
| 123 | * Bit 7: reserved, always 0 |
| 124 | * Bits 6-4: command |
| 125 | * Bits 3-0: upper bits of register offset |
| 126 | */ |
| 127 | u8 cmd_off; |
| 128 | u8 lower_off; |
| 129 | u8 nbytes; |
| 130 | u8 buf[MMA9551_MAX_MAILBOX_DATA_REGS - 1]; |
| 131 | } __packed; |
| 132 | |
| 133 | struct mma9551_mbox_response { |
| 134 | u8 app_id; |
| 135 | /* |
| 136 | * See Section 5.3.3 of the MMA955xL Software Reference Manual. |
| 137 | * |
| 138 | * Bit 7: COCO |
| 139 | * Bits 6-0: Error code. |
| 140 | */ |
| 141 | u8 coco_err; |
| 142 | u8 nbytes; |
| 143 | u8 req_bytes; |
| 144 | u8 buf[MMA9551_MAX_MAILBOX_DATA_REGS]; |
| 145 | } __packed; |
| 146 | |
| 147 | struct mma9551_version_info { |
| 148 | __be32 device_id; |
| 149 | u8 rom_version[2]; |
| 150 | u8 fw_version[2]; |
| 151 | u8 hw_version[2]; |
| 152 | u8 fw_build[2]; |
| 153 | }; |
| 154 | |
| 155 | struct mma9551_data { |
| 156 | struct i2c_client *client; |
| 157 | struct mutex mutex; |
| 158 | int event_enabled[3]; |
| 159 | int irqs[MMA9551_GPIO_COUNT]; |
| 160 | }; |
| 161 | |
| 162 | static int mma9551_transfer(struct i2c_client *client, |
| 163 | u8 app_id, u8 command, u16 offset, |
| 164 | u8 *inbytes, int num_inbytes, |
| 165 | u8 *outbytes, int num_outbytes) |
| 166 | { |
| 167 | struct mma9551_mbox_request req; |
| 168 | struct mma9551_mbox_response rsp; |
| 169 | struct i2c_msg in, out; |
| 170 | u8 req_len, err_code; |
| 171 | int ret, retries; |
| 172 | |
| 173 | if (offset >= 1 << 12) { |
| 174 | dev_err(&client->dev, "register offset too large\n"); |
| 175 | return -EINVAL; |
| 176 | } |
| 177 | |
| 178 | req_len = 1 + MMA9551_MAILBOX_CTRL_REGS + num_inbytes; |
| 179 | req.start_mbox = 0; |
| 180 | req.app_id = app_id; |
| 181 | req.cmd_off = command | (offset >> 8); |
| 182 | req.lower_off = offset; |
| 183 | |
| 184 | if (command == MMA9551_CMD_WRITE_CONFIG) |
| 185 | req.nbytes = num_inbytes; |
| 186 | else |
| 187 | req.nbytes = num_outbytes; |
| 188 | if (num_inbytes) |
| 189 | memcpy(req.buf, inbytes, num_inbytes); |
| 190 | |
| 191 | out.addr = client->addr; |
| 192 | out.flags = 0; |
| 193 | out.len = req_len; |
| 194 | out.buf = (u8 *)&req; |
| 195 | |
| 196 | ret = i2c_transfer(client->adapter, &out, 1); |
| 197 | if (ret < 0) { |
| 198 | dev_err(&client->dev, "i2c write failed\n"); |
| 199 | return ret; |
| 200 | } |
| 201 | |
| 202 | retries = MMA9551_I2C_READ_RETRIES; |
| 203 | do { |
| 204 | udelay(MMA9551_I2C_READ_DELAY); |
| 205 | |
| 206 | in.addr = client->addr; |
| 207 | in.flags = I2C_M_RD; |
| 208 | in.len = sizeof(rsp); |
| 209 | in.buf = (u8 *)&rsp; |
| 210 | |
| 211 | ret = i2c_transfer(client->adapter, &in, 1); |
| 212 | if (ret < 0) { |
| 213 | dev_err(&client->dev, "i2c read failed\n"); |
| 214 | return ret; |
| 215 | } |
| 216 | |
| 217 | if (rsp.coco_err & MMA9551_RESPONSE_COCO) |
| 218 | break; |
| 219 | } while (--retries > 0); |
| 220 | |
| 221 | if (retries == 0) { |
| 222 | dev_err(&client->dev, |
| 223 | "timed out while waiting for command response\n"); |
| 224 | return -ETIMEDOUT; |
| 225 | } |
| 226 | |
| 227 | if (rsp.app_id != app_id) { |
| 228 | dev_err(&client->dev, |
| 229 | "app_id mismatch in response got %02x expected %02x\n", |
| 230 | rsp.app_id, app_id); |
| 231 | return -EINVAL; |
| 232 | } |
| 233 | |
| 234 | err_code = rsp.coco_err & ~MMA9551_RESPONSE_COCO; |
| 235 | if (err_code != MMA9551_MCI_ERROR_NONE) { |
| 236 | dev_err(&client->dev, "read returned error %x\n", err_code); |
| 237 | return -EINVAL; |
| 238 | } |
| 239 | |
| 240 | if (rsp.nbytes != rsp.req_bytes) { |
| 241 | dev_err(&client->dev, |
| 242 | "output length mismatch got %d expected %d\n", |
| 243 | rsp.nbytes, rsp.req_bytes); |
| 244 | return -EINVAL; |
| 245 | } |
| 246 | |
| 247 | if (num_outbytes) |
| 248 | memcpy(outbytes, rsp.buf, num_outbytes); |
| 249 | |
| 250 | return 0; |
| 251 | } |
| 252 | |
| 253 | static int mma9551_read_config_byte(struct i2c_client *client, u8 app_id, |
| 254 | u16 reg, u8 *val) |
| 255 | { |
| 256 | return mma9551_transfer(client, app_id, MMA9551_CMD_READ_CONFIG, |
| 257 | reg, NULL, 0, val, 1); |
| 258 | } |
| 259 | |
| 260 | static int mma9551_write_config_byte(struct i2c_client *client, u8 app_id, |
| 261 | u16 reg, u8 val) |
| 262 | { |
| 263 | return mma9551_transfer(client, app_id, MMA9551_CMD_WRITE_CONFIG, reg, |
| 264 | &val, 1, NULL, 0); |
| 265 | } |
| 266 | |
| 267 | static int mma9551_read_status_byte(struct i2c_client *client, u8 app_id, |
| 268 | u16 reg, u8 *val) |
| 269 | { |
| 270 | return mma9551_transfer(client, app_id, MMA9551_CMD_READ_STATUS, |
| 271 | reg, NULL, 0, val, 1); |
| 272 | } |
| 273 | |
| 274 | static int mma9551_read_status_word(struct i2c_client *client, u8 app_id, |
| 275 | u16 reg, u16 *val) |
| 276 | { |
| 277 | int ret; |
| 278 | __be16 v; |
| 279 | |
| 280 | ret = mma9551_transfer(client, app_id, MMA9551_CMD_READ_STATUS, |
| 281 | reg, NULL, 0, (u8 *)&v, 2); |
| 282 | *val = be16_to_cpu(v); |
| 283 | |
| 284 | return ret; |
| 285 | } |
| 286 | |
| 287 | static int mma9551_update_config_bits(struct i2c_client *client, u8 app_id, |
| 288 | u16 reg, u8 mask, u8 val) |
| 289 | { |
| 290 | int ret; |
| 291 | u8 tmp, orig; |
| 292 | |
| 293 | ret = mma9551_read_config_byte(client, app_id, reg, &orig); |
| 294 | if (ret < 0) |
| 295 | return ret; |
| 296 | |
| 297 | tmp = orig & ~mask; |
| 298 | tmp |= val & mask; |
| 299 | |
| 300 | if (tmp == orig) |
| 301 | return 0; |
| 302 | |
| 303 | return mma9551_write_config_byte(client, app_id, reg, tmp); |
| 304 | } |
| 305 | |
| 306 | /* |
| 307 | * The polarity parameter is described in section 6.2.2, page 66, of the |
| 308 | * Software Reference Manual. Basically, polarity=0 means the interrupt |
| 309 | * line has the same value as the selected bit, while polarity=1 means |
| 310 | * the line is inverted. |
| 311 | */ |
| 312 | static int mma9551_gpio_config(struct i2c_client *client, |
| 313 | enum mma9551_gpio_pin pin, |
| 314 | u8 app_id, u8 bitnum, int polarity) |
| 315 | { |
| 316 | u8 reg, pol_mask, pol_val; |
| 317 | int ret; |
| 318 | |
| 319 | if (pin > mma9551_gpio_max) { |
| 320 | dev_err(&client->dev, "bad GPIO pin\n"); |
| 321 | return -EINVAL; |
| 322 | } |
| 323 | |
| 324 | /* |
| 325 | * Pin 6 is configured by regs 0x00 and 0x01, pin 7 by 0x02 and |
| 326 | * 0x03, and so on. |
| 327 | */ |
| 328 | reg = pin * 2; |
| 329 | |
| 330 | ret = mma9551_write_config_byte(client, MMA9551_APPID_GPIO, |
| 331 | reg, app_id); |
| 332 | if (ret < 0) { |
| 333 | dev_err(&client->dev, "error setting GPIO app_id\n"); |
| 334 | return ret; |
| 335 | } |
| 336 | |
| 337 | ret = mma9551_write_config_byte(client, MMA9551_APPID_GPIO, |
| 338 | reg + 1, bitnum); |
| 339 | if (ret < 0) { |
| 340 | dev_err(&client->dev, "error setting GPIO bit number\n"); |
| 341 | return ret; |
| 342 | } |
| 343 | |
| 344 | switch (pin) { |
| 345 | case mma9551_gpio6: |
| 346 | reg = MMA9551_GPIO_POL_LSB; |
| 347 | pol_mask = 1 << 6; |
| 348 | break; |
| 349 | case mma9551_gpio7: |
| 350 | reg = MMA9551_GPIO_POL_LSB; |
| 351 | pol_mask = 1 << 7; |
| 352 | break; |
| 353 | case mma9551_gpio8: |
| 354 | reg = MMA9551_GPIO_POL_MSB; |
| 355 | pol_mask = 1 << 0; |
| 356 | break; |
| 357 | case mma9551_gpio9: |
| 358 | reg = MMA9551_GPIO_POL_MSB; |
| 359 | pol_mask = 1 << 1; |
| 360 | break; |
| 361 | } |
| 362 | pol_val = polarity ? pol_mask : 0; |
| 363 | |
| 364 | ret = mma9551_update_config_bits(client, MMA9551_APPID_GPIO, reg, |
| 365 | pol_mask, pol_val); |
| 366 | if (ret < 0) |
| 367 | dev_err(&client->dev, "error setting GPIO polarity\n"); |
| 368 | |
| 369 | return ret; |
| 370 | } |
| 371 | |
| 372 | static int mma9551_read_version(struct i2c_client *client) |
| 373 | { |
| 374 | struct mma9551_version_info info; |
| 375 | int ret; |
| 376 | |
| 377 | ret = mma9551_transfer(client, MMA9551_APPID_VERSION, 0x00, 0x00, |
| 378 | NULL, 0, (u8 *)&info, sizeof(info)); |
| 379 | if (ret < 0) |
| 380 | return ret; |
| 381 | |
| 382 | dev_info(&client->dev, "Device ID 0x%x, firmware version %02x.%02x\n", |
| 383 | be32_to_cpu(info.device_id), info.fw_version[0], |
| 384 | info.fw_version[1]); |
| 385 | |
| 386 | return 0; |
| 387 | } |
| 388 | |
| 389 | /* |
| 390 | * Use 'false' as the second parameter to cause the device to enter |
| 391 | * sleep. |
| 392 | */ |
| 393 | static int mma9551_set_device_state(struct i2c_client *client, |
| 394 | bool enable) |
| 395 | { |
| 396 | return mma9551_update_config_bits(client, MMA9551_APPID_SLEEP_WAKE, |
| 397 | MMA9551_SLEEP_CFG, |
| 398 | MMA9551_SLEEP_CFG_SNCEN, |
| 399 | enable ? 0 : MMA9551_SLEEP_CFG_SNCEN); |
| 400 | } |
| 401 | |
| 402 | static int mma9551_read_incli_chan(struct i2c_client *client, |
| 403 | const struct iio_chan_spec *chan, |
| 404 | int *val) |
| 405 | { |
| 406 | u8 quad_shift, angle, quadrant; |
| 407 | u16 reg_addr; |
| 408 | int ret; |
| 409 | |
| 410 | switch (chan->channel2) { |
| 411 | case IIO_MOD_X: |
| 412 | reg_addr = MMA9551_TILT_YZ_ANG_REG; |
| 413 | quad_shift = MMA9551_TILT_YZ_QUAD_SHIFT; |
| 414 | break; |
| 415 | case IIO_MOD_Y: |
| 416 | reg_addr = MMA9551_TILT_XZ_ANG_REG; |
| 417 | quad_shift = MMA9551_TILT_XZ_QUAD_SHIFT; |
| 418 | break; |
| 419 | case IIO_MOD_Z: |
| 420 | reg_addr = MMA9551_TILT_XY_ANG_REG; |
| 421 | quad_shift = MMA9551_TILT_XY_QUAD_SHIFT; |
| 422 | break; |
| 423 | default: |
| 424 | return -EINVAL; |
| 425 | } |
| 426 | |
| 427 | ret = mma9551_read_status_byte(client, MMA9551_APPID_TILT, |
| 428 | reg_addr, &angle); |
| 429 | if (ret < 0) |
| 430 | return ret; |
| 431 | |
| 432 | ret = mma9551_read_status_byte(client, MMA9551_APPID_TILT, |
| 433 | MMA9551_TILT_QUAD_REG, &quadrant); |
| 434 | if (ret < 0) |
| 435 | return ret; |
| 436 | |
| 437 | angle &= ~MMA9551_TILT_ANGFLG; |
| 438 | quadrant = (quadrant >> quad_shift) & 0x03; |
| 439 | |
| 440 | if (quadrant == 1 || quadrant == 3) |
| 441 | *val = 90 * (quadrant + 1) - angle; |
| 442 | else |
| 443 | *val = angle + 90 * quadrant; |
| 444 | |
| 445 | return IIO_VAL_INT; |
| 446 | } |
| 447 | |
| 448 | static int mma9551_read_accel_chan(struct i2c_client *client, |
| 449 | const struct iio_chan_spec *chan, |
| 450 | int *val, int *val2) |
| 451 | { |
| 452 | u16 reg_addr; |
| 453 | s16 raw_accel; |
| 454 | int ret; |
| 455 | |
| 456 | switch (chan->channel2) { |
| 457 | case IIO_MOD_X: |
| 458 | reg_addr = MMA9551_AFE_X_ACCEL_REG; |
| 459 | break; |
| 460 | case IIO_MOD_Y: |
| 461 | reg_addr = MMA9551_AFE_Y_ACCEL_REG; |
| 462 | break; |
| 463 | case IIO_MOD_Z: |
| 464 | reg_addr = MMA9551_AFE_Z_ACCEL_REG; |
| 465 | break; |
| 466 | default: |
| 467 | return -EINVAL; |
| 468 | } |
| 469 | |
| 470 | ret = mma9551_read_status_word(client, MMA9551_APPID_AFE, |
| 471 | reg_addr, &raw_accel); |
| 472 | if (ret < 0) |
| 473 | return ret; |
| 474 | |
| 475 | *val = raw_accel; |
| 476 | |
| 477 | return IIO_VAL_INT; |
| 478 | } |
| 479 | |
| 480 | static int mma9551_read_raw(struct iio_dev *indio_dev, |
| 481 | struct iio_chan_spec const *chan, |
| 482 | int *val, int *val2, long mask) |
| 483 | { |
| 484 | struct mma9551_data *data = iio_priv(indio_dev); |
| 485 | int ret; |
| 486 | |
| 487 | switch (mask) { |
| 488 | case IIO_CHAN_INFO_PROCESSED: |
| 489 | switch (chan->type) { |
| 490 | case IIO_INCLI: |
| 491 | mutex_lock(&data->mutex); |
| 492 | ret = mma9551_read_incli_chan(data->client, chan, val); |
| 493 | mutex_unlock(&data->mutex); |
| 494 | return ret; |
| 495 | default: |
| 496 | return -EINVAL; |
| 497 | } |
| 498 | case IIO_CHAN_INFO_RAW: |
| 499 | switch (chan->type) { |
| 500 | case IIO_ACCEL: |
| 501 | mutex_lock(&data->mutex); |
| 502 | ret = mma9551_read_accel_chan(data->client, |
| 503 | chan, val, val2); |
| 504 | mutex_unlock(&data->mutex); |
| 505 | return ret; |
| 506 | default: |
| 507 | return -EINVAL; |
| 508 | } |
| 509 | case IIO_CHAN_INFO_SCALE: |
| 510 | switch (chan->type) { |
| 511 | case IIO_ACCEL: |
| 512 | *val = 0; |
| 513 | *val2 = 2440; |
| 514 | return IIO_VAL_INT_PLUS_MICRO; |
| 515 | default: |
| 516 | return -EINVAL; |
| 517 | } |
| 518 | default: |
| 519 | return -EINVAL; |
| 520 | } |
| 521 | } |
| 522 | |
| 523 | static int mma9551_read_event_config(struct iio_dev *indio_dev, |
| 524 | const struct iio_chan_spec *chan, |
| 525 | enum iio_event_type type, |
| 526 | enum iio_event_direction dir) |
| 527 | { |
| 528 | struct mma9551_data *data = iio_priv(indio_dev); |
| 529 | |
| 530 | switch (chan->type) { |
| 531 | case IIO_INCLI: |
| 532 | /* IIO counts axes from 1, because IIO_NO_MOD is 0. */ |
| 533 | return data->event_enabled[chan->channel2 - 1]; |
| 534 | default: |
| 535 | return -EINVAL; |
| 536 | } |
| 537 | } |
| 538 | |
| 539 | static int mma9551_config_incli_event(struct iio_dev *indio_dev, |
| 540 | enum iio_modifier axis, |
| 541 | int state) |
| 542 | { |
| 543 | struct mma9551_data *data = iio_priv(indio_dev); |
| 544 | enum mma9551_tilt_axis mma_axis; |
| 545 | int ret; |
| 546 | |
| 547 | /* IIO counts axes from 1, because IIO_NO_MOD is 0. */ |
| 548 | mma_axis = axis - 1; |
| 549 | |
| 550 | if (data->event_enabled[mma_axis] == state) |
| 551 | return 0; |
| 552 | |
| 553 | if (state == 0) { |
Vlad Dogaru | 60347e7 | 2014-12-15 17:16:51 +0200 | [diff] [blame^] | 554 | ret = mma9551_gpio_config(data->client, |
| 555 | (enum mma9551_gpio_pin)mma_axis, |
Vlad Dogaru | c78b917 | 2014-11-24 11:43:15 +0200 | [diff] [blame] | 556 | MMA9551_APPID_NONE, 0, 0); |
| 557 | if (ret < 0) |
| 558 | return ret; |
| 559 | } else { |
| 560 | int bitnum; |
| 561 | |
| 562 | /* Bit 7 of each angle register holds the angle flag. */ |
| 563 | switch (axis) { |
| 564 | case IIO_MOD_X: |
| 565 | bitnum = 7 + 8 * MMA9551_TILT_YZ_ANG_REG; |
| 566 | break; |
| 567 | case IIO_MOD_Y: |
| 568 | bitnum = 7 + 8 * MMA9551_TILT_XZ_ANG_REG; |
| 569 | break; |
| 570 | case IIO_MOD_Z: |
| 571 | bitnum = 7 + 8 * MMA9551_TILT_XY_ANG_REG; |
| 572 | break; |
| 573 | default: |
| 574 | return -EINVAL; |
| 575 | } |
| 576 | |
Vlad Dogaru | 60347e7 | 2014-12-15 17:16:51 +0200 | [diff] [blame^] | 577 | ret = mma9551_gpio_config(data->client, |
| 578 | (enum mma9551_gpio_pin)mma_axis, |
Vlad Dogaru | c78b917 | 2014-11-24 11:43:15 +0200 | [diff] [blame] | 579 | MMA9551_APPID_TILT, bitnum, 0); |
| 580 | if (ret < 0) |
| 581 | return ret; |
| 582 | } |
| 583 | |
| 584 | data->event_enabled[mma_axis] = state; |
| 585 | |
| 586 | return ret; |
| 587 | } |
| 588 | |
| 589 | static int mma9551_write_event_config(struct iio_dev *indio_dev, |
| 590 | const struct iio_chan_spec *chan, |
| 591 | enum iio_event_type type, |
| 592 | enum iio_event_direction dir, |
| 593 | int state) |
| 594 | { |
| 595 | struct mma9551_data *data = iio_priv(indio_dev); |
| 596 | int ret; |
| 597 | |
| 598 | switch (chan->type) { |
| 599 | case IIO_INCLI: |
| 600 | mutex_lock(&data->mutex); |
| 601 | ret = mma9551_config_incli_event(indio_dev, |
| 602 | chan->channel2, state); |
| 603 | mutex_unlock(&data->mutex); |
| 604 | return ret; |
| 605 | default: |
| 606 | return -EINVAL; |
| 607 | } |
| 608 | } |
| 609 | |
| 610 | static int mma9551_write_event_value(struct iio_dev *indio_dev, |
| 611 | const struct iio_chan_spec *chan, |
| 612 | enum iio_event_type type, |
| 613 | enum iio_event_direction dir, |
| 614 | enum iio_event_info info, |
| 615 | int val, int val2) |
| 616 | { |
| 617 | struct mma9551_data *data = iio_priv(indio_dev); |
| 618 | int ret; |
| 619 | |
| 620 | switch (chan->type) { |
| 621 | case IIO_INCLI: |
| 622 | if (val2 != 0 || val < 1 || val > 10) |
| 623 | return -EINVAL; |
| 624 | mutex_lock(&data->mutex); |
| 625 | ret = mma9551_update_config_bits(data->client, |
| 626 | MMA9551_APPID_TILT, |
| 627 | MMA9551_TILT_CFG_REG, |
| 628 | MMA9551_TILT_ANG_THRESH_MASK, |
| 629 | val); |
| 630 | mutex_unlock(&data->mutex); |
| 631 | return ret; |
| 632 | default: |
| 633 | return -EINVAL; |
| 634 | } |
| 635 | } |
| 636 | |
| 637 | static int mma9551_read_event_value(struct iio_dev *indio_dev, |
| 638 | const struct iio_chan_spec *chan, |
| 639 | enum iio_event_type type, |
| 640 | enum iio_event_direction dir, |
| 641 | enum iio_event_info info, |
| 642 | int *val, int *val2) |
| 643 | { |
| 644 | struct mma9551_data *data = iio_priv(indio_dev); |
| 645 | int ret; |
| 646 | u8 tmp; |
| 647 | |
| 648 | switch (chan->type) { |
| 649 | case IIO_INCLI: |
| 650 | mutex_lock(&data->mutex); |
| 651 | ret = mma9551_read_config_byte(data->client, |
| 652 | MMA9551_APPID_TILT, |
| 653 | MMA9551_TILT_CFG_REG, &tmp); |
| 654 | mutex_unlock(&data->mutex); |
| 655 | if (ret < 0) |
| 656 | return ret; |
| 657 | *val = tmp & MMA9551_TILT_ANG_THRESH_MASK; |
| 658 | *val2 = 0; |
| 659 | return IIO_VAL_INT; |
| 660 | default: |
| 661 | return -EINVAL; |
| 662 | } |
| 663 | } |
| 664 | |
| 665 | static const struct iio_event_spec mma9551_incli_event = { |
| 666 | .type = IIO_EV_TYPE_ROC, |
| 667 | .dir = IIO_EV_DIR_RISING, |
| 668 | .mask_separate = BIT(IIO_EV_INFO_ENABLE), |
| 669 | .mask_shared_by_type = BIT(IIO_EV_INFO_VALUE), |
| 670 | }; |
| 671 | |
| 672 | #define MMA9551_ACCEL_CHANNEL(axis) { \ |
| 673 | .type = IIO_ACCEL, \ |
| 674 | .modified = 1, \ |
| 675 | .channel2 = axis, \ |
| 676 | .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ |
| 677 | .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \ |
| 678 | } |
| 679 | |
| 680 | #define MMA9551_INCLI_CHANNEL(axis) { \ |
| 681 | .type = IIO_INCLI, \ |
| 682 | .modified = 1, \ |
| 683 | .channel2 = axis, \ |
| 684 | .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED), \ |
| 685 | .event_spec = &mma9551_incli_event, \ |
| 686 | .num_event_specs = 1, \ |
| 687 | } |
| 688 | |
| 689 | static const struct iio_chan_spec mma9551_channels[] = { |
| 690 | MMA9551_ACCEL_CHANNEL(IIO_MOD_X), |
| 691 | MMA9551_ACCEL_CHANNEL(IIO_MOD_Y), |
| 692 | MMA9551_ACCEL_CHANNEL(IIO_MOD_Z), |
| 693 | |
| 694 | MMA9551_INCLI_CHANNEL(IIO_MOD_X), |
| 695 | MMA9551_INCLI_CHANNEL(IIO_MOD_Y), |
| 696 | MMA9551_INCLI_CHANNEL(IIO_MOD_Z), |
| 697 | }; |
| 698 | |
| 699 | static const struct iio_info mma9551_info = { |
| 700 | .driver_module = THIS_MODULE, |
| 701 | .read_raw = mma9551_read_raw, |
| 702 | .read_event_config = mma9551_read_event_config, |
| 703 | .write_event_config = mma9551_write_event_config, |
| 704 | .read_event_value = mma9551_read_event_value, |
| 705 | .write_event_value = mma9551_write_event_value, |
| 706 | }; |
| 707 | |
| 708 | static irqreturn_t mma9551_event_handler(int irq, void *private) |
| 709 | { |
| 710 | struct iio_dev *indio_dev = private; |
| 711 | struct mma9551_data *data = iio_priv(indio_dev); |
| 712 | int i, ret, mma_axis = -1; |
| 713 | u16 reg; |
| 714 | u8 val; |
| 715 | |
| 716 | mutex_lock(&data->mutex); |
| 717 | |
| 718 | for (i = 0; i < 3; i++) |
| 719 | if (irq == data->irqs[i]) { |
| 720 | mma_axis = i; |
| 721 | break; |
| 722 | } |
| 723 | |
| 724 | if (mma_axis == -1) { |
| 725 | /* IRQ was triggered on 4th line, which we don't use. */ |
| 726 | dev_warn(&data->client->dev, |
| 727 | "irq triggered on unused line %d\n", data->irqs[3]); |
| 728 | goto out; |
| 729 | } |
| 730 | |
| 731 | switch (mma_axis) { |
| 732 | case mma9551_x: |
| 733 | reg = MMA9551_TILT_YZ_ANG_REG; |
| 734 | break; |
| 735 | case mma9551_y: |
| 736 | reg = MMA9551_TILT_XZ_ANG_REG; |
| 737 | break; |
| 738 | case mma9551_z: |
| 739 | reg = MMA9551_TILT_XY_ANG_REG; |
| 740 | break; |
| 741 | } |
| 742 | |
| 743 | /* |
| 744 | * Read the angle even though we don't use it, otherwise we |
| 745 | * won't get any further interrupts. |
| 746 | */ |
| 747 | ret = mma9551_read_status_byte(data->client, MMA9551_APPID_TILT, |
| 748 | reg, &val); |
| 749 | if (ret < 0) { |
| 750 | dev_err(&data->client->dev, |
| 751 | "error %d reading tilt register in IRQ\n", ret); |
| 752 | goto out; |
| 753 | } |
| 754 | |
| 755 | iio_push_event(indio_dev, |
| 756 | IIO_MOD_EVENT_CODE(IIO_INCLI, 0, (mma_axis + 1), |
| 757 | IIO_EV_TYPE_ROC, IIO_EV_DIR_RISING), |
| 758 | iio_get_time_ns()); |
| 759 | |
| 760 | out: |
| 761 | mutex_unlock(&data->mutex); |
| 762 | |
| 763 | return IRQ_HANDLED; |
| 764 | } |
| 765 | |
| 766 | static int mma9551_init(struct mma9551_data *data) |
| 767 | { |
| 768 | int ret; |
| 769 | |
| 770 | ret = mma9551_read_version(data->client); |
| 771 | if (ret) |
| 772 | return ret; |
| 773 | |
| 774 | /* Power on chip and enable doze mode. */ |
| 775 | return mma9551_update_config_bits(data->client, |
| 776 | MMA9551_APPID_SLEEP_WAKE, |
| 777 | MMA9551_SLEEP_CFG, |
| 778 | MMA9551_SLEEP_CFG_SCHEN | MMA9551_SLEEP_CFG_SNCEN, |
| 779 | MMA9551_SLEEP_CFG_SCHEN); |
| 780 | } |
| 781 | |
| 782 | static int mma9551_gpio_probe(struct iio_dev *indio_dev) |
| 783 | { |
| 784 | struct gpio_desc *gpio; |
| 785 | int i, ret; |
| 786 | struct mma9551_data *data = iio_priv(indio_dev); |
| 787 | struct device *dev = &data->client->dev; |
| 788 | |
| 789 | for (i = 0; i < MMA9551_GPIO_COUNT; i++) { |
| 790 | gpio = devm_gpiod_get_index(dev, MMA9551_GPIO_NAME, i); |
| 791 | if (IS_ERR(gpio)) { |
| 792 | dev_err(dev, "acpi gpio get index failed\n"); |
| 793 | return PTR_ERR(gpio); |
| 794 | } |
| 795 | |
| 796 | ret = gpiod_direction_input(gpio); |
| 797 | if (ret) |
| 798 | return ret; |
| 799 | |
| 800 | data->irqs[i] = gpiod_to_irq(gpio); |
| 801 | ret = devm_request_threaded_irq(dev, data->irqs[i], |
| 802 | NULL, mma9551_event_handler, |
| 803 | IRQF_TRIGGER_RISING | IRQF_ONESHOT, |
| 804 | MMA9551_IRQ_NAME, indio_dev); |
| 805 | if (ret < 0) { |
| 806 | dev_err(dev, "request irq %d failed\n", data->irqs[i]); |
| 807 | return ret; |
| 808 | } |
| 809 | |
| 810 | dev_dbg(dev, "gpio resource, no:%d irq:%d\n", |
| 811 | desc_to_gpio(gpio), data->irqs[i]); |
| 812 | } |
| 813 | |
| 814 | return 0; |
| 815 | } |
| 816 | |
| 817 | static const char *mma9551_match_acpi_device(struct device *dev) |
| 818 | { |
| 819 | const struct acpi_device_id *id; |
| 820 | |
| 821 | id = acpi_match_device(dev->driver->acpi_match_table, dev); |
| 822 | if (!id) |
| 823 | return NULL; |
| 824 | |
| 825 | return dev_name(dev); |
| 826 | } |
| 827 | |
| 828 | static int mma9551_probe(struct i2c_client *client, |
| 829 | const struct i2c_device_id *id) |
| 830 | { |
| 831 | struct mma9551_data *data; |
| 832 | struct iio_dev *indio_dev; |
| 833 | const char *name = NULL; |
| 834 | int ret; |
| 835 | |
| 836 | indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data)); |
| 837 | if (!indio_dev) |
| 838 | return -ENOMEM; |
| 839 | |
| 840 | data = iio_priv(indio_dev); |
| 841 | i2c_set_clientdata(client, indio_dev); |
| 842 | data->client = client; |
| 843 | |
| 844 | if (id) |
| 845 | name = id->name; |
| 846 | else if (ACPI_HANDLE(&client->dev)) |
| 847 | name = mma9551_match_acpi_device(&client->dev); |
| 848 | |
| 849 | ret = mma9551_init(data); |
| 850 | if (ret < 0) |
| 851 | return ret; |
| 852 | |
| 853 | mutex_init(&data->mutex); |
| 854 | |
| 855 | indio_dev->dev.parent = &client->dev; |
| 856 | indio_dev->channels = mma9551_channels; |
| 857 | indio_dev->num_channels = ARRAY_SIZE(mma9551_channels); |
| 858 | indio_dev->name = name; |
| 859 | indio_dev->modes = INDIO_DIRECT_MODE; |
| 860 | indio_dev->info = &mma9551_info; |
| 861 | |
| 862 | ret = mma9551_gpio_probe(indio_dev); |
| 863 | if (ret < 0) |
| 864 | goto out_poweroff; |
| 865 | |
| 866 | ret = iio_device_register(indio_dev); |
| 867 | if (ret < 0) { |
| 868 | dev_err(&client->dev, "unable to register iio device\n"); |
| 869 | goto out_poweroff; |
| 870 | } |
| 871 | |
| 872 | return 0; |
| 873 | |
| 874 | out_poweroff: |
| 875 | mma9551_set_device_state(client, false); |
| 876 | |
| 877 | return ret; |
| 878 | } |
| 879 | |
| 880 | static int mma9551_remove(struct i2c_client *client) |
| 881 | { |
| 882 | struct iio_dev *indio_dev = i2c_get_clientdata(client); |
| 883 | struct mma9551_data *data = iio_priv(indio_dev); |
| 884 | |
| 885 | iio_device_unregister(indio_dev); |
| 886 | mutex_lock(&data->mutex); |
| 887 | mma9551_set_device_state(data->client, false); |
| 888 | mutex_unlock(&data->mutex); |
| 889 | |
| 890 | return 0; |
| 891 | } |
| 892 | |
| 893 | #ifdef CONFIG_PM_SLEEP |
| 894 | static int mma9551_suspend(struct device *dev) |
| 895 | { |
| 896 | struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); |
| 897 | struct mma9551_data *data = iio_priv(indio_dev); |
| 898 | |
| 899 | mutex_lock(&data->mutex); |
| 900 | mma9551_set_device_state(data->client, false); |
| 901 | mutex_unlock(&data->mutex); |
| 902 | |
| 903 | return 0; |
| 904 | } |
| 905 | |
| 906 | static int mma9551_resume(struct device *dev) |
| 907 | { |
| 908 | struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); |
| 909 | struct mma9551_data *data = iio_priv(indio_dev); |
| 910 | |
| 911 | mutex_lock(&data->mutex); |
| 912 | mma9551_set_device_state(data->client, true); |
| 913 | mutex_unlock(&data->mutex); |
| 914 | |
| 915 | return 0; |
| 916 | } |
| 917 | #else |
| 918 | #define mma9551_suspend NULL |
| 919 | #define mma9551_resume NULL |
| 920 | #endif |
| 921 | |
| 922 | static const struct dev_pm_ops mma9551_pm_ops = { |
| 923 | SET_SYSTEM_SLEEP_PM_OPS(mma9551_suspend, mma9551_resume) |
| 924 | }; |
| 925 | |
| 926 | static const struct acpi_device_id mma9551_acpi_match[] = { |
| 927 | {"MMA9551", 0}, |
| 928 | {}, |
| 929 | }; |
| 930 | |
| 931 | MODULE_DEVICE_TABLE(acpi, mma9551_acpi_match); |
| 932 | |
| 933 | static const struct i2c_device_id mma9551_id[] = { |
| 934 | {"mma9551", 0}, |
| 935 | {} |
| 936 | }; |
| 937 | |
| 938 | MODULE_DEVICE_TABLE(i2c, mma9551_id); |
| 939 | |
| 940 | static struct i2c_driver mma9551_driver = { |
| 941 | .driver = { |
| 942 | .name = MMA9551_DRV_NAME, |
| 943 | .acpi_match_table = ACPI_PTR(mma9551_acpi_match), |
| 944 | .pm = &mma9551_pm_ops, |
| 945 | }, |
| 946 | .probe = mma9551_probe, |
| 947 | .remove = mma9551_remove, |
| 948 | .id_table = mma9551_id, |
| 949 | }; |
| 950 | |
| 951 | module_i2c_driver(mma9551_driver); |
| 952 | |
| 953 | MODULE_AUTHOR("Irina Tirdea <irina.tirdea@intel.com>"); |
| 954 | MODULE_AUTHOR("Vlad Dogaru <vlad.dogaru@intel.com>"); |
| 955 | MODULE_LICENSE("GPL v2"); |
| 956 | MODULE_DESCRIPTION("MMA9551L motion-sensing platform driver"); |