David Barksdale | e932d81 | 2014-02-04 12:42:48 -0600 | [diff] [blame] | 1 | /* |
| 2 | * hid-cp2112.c - Silicon Labs HID USB to SMBus master bridge |
| 3 | * Copyright (c) 2013,2014 Uplogix, Inc. |
| 4 | * David Barksdale <dbarksdale@uplogix.com> |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify it |
| 7 | * under the terms and conditions of the GNU General Public License, |
| 8 | * version 2, as published by the Free Software Foundation. |
| 9 | * |
| 10 | * This program is distributed in the hope it will be useful, but WITHOUT |
| 11 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 12 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| 13 | * more details. |
| 14 | */ |
| 15 | |
| 16 | /* |
| 17 | * The Silicon Labs CP2112 chip is a USB HID device which provides an |
| 18 | * SMBus controller for talking to slave devices and 8 GPIO pins. The |
| 19 | * host communicates with the CP2112 via raw HID reports. |
| 20 | * |
| 21 | * Data Sheet: |
| 22 | * http://www.silabs.com/Support%20Documents/TechnicalDocs/CP2112.pdf |
| 23 | * Programming Interface Specification: |
| 24 | * http://www.silabs.com/Support%20Documents/TechnicalDocs/AN495.pdf |
| 25 | */ |
| 26 | |
| 27 | #include <linux/gpio.h> |
| 28 | #include <linux/hid.h> |
| 29 | #include <linux/i2c.h> |
| 30 | #include <linux/module.h> |
| 31 | #include <linux/nls.h> |
| 32 | #include <linux/usb/ch9.h> |
| 33 | #include "hid-ids.h" |
| 34 | |
| 35 | enum { |
| 36 | CP2112_GPIO_CONFIG = 0x02, |
| 37 | CP2112_GPIO_GET = 0x03, |
| 38 | CP2112_GPIO_SET = 0x04, |
| 39 | CP2112_GET_VERSION_INFO = 0x05, |
| 40 | CP2112_SMBUS_CONFIG = 0x06, |
| 41 | CP2112_DATA_READ_REQUEST = 0x10, |
| 42 | CP2112_DATA_WRITE_READ_REQUEST = 0x11, |
| 43 | CP2112_DATA_READ_FORCE_SEND = 0x12, |
| 44 | CP2112_DATA_READ_RESPONSE = 0x13, |
| 45 | CP2112_DATA_WRITE_REQUEST = 0x14, |
| 46 | CP2112_TRANSFER_STATUS_REQUEST = 0x15, |
| 47 | CP2112_TRANSFER_STATUS_RESPONSE = 0x16, |
| 48 | CP2112_CANCEL_TRANSFER = 0x17, |
| 49 | CP2112_LOCK_BYTE = 0x20, |
| 50 | CP2112_USB_CONFIG = 0x21, |
| 51 | CP2112_MANUFACTURER_STRING = 0x22, |
| 52 | CP2112_PRODUCT_STRING = 0x23, |
| 53 | CP2112_SERIAL_STRING = 0x24, |
| 54 | }; |
| 55 | |
| 56 | enum { |
| 57 | STATUS0_IDLE = 0x00, |
| 58 | STATUS0_BUSY = 0x01, |
| 59 | STATUS0_COMPLETE = 0x02, |
| 60 | STATUS0_ERROR = 0x03, |
| 61 | }; |
| 62 | |
| 63 | enum { |
| 64 | STATUS1_TIMEOUT_NACK = 0x00, |
| 65 | STATUS1_TIMEOUT_BUS = 0x01, |
| 66 | STATUS1_ARBITRATION_LOST = 0x02, |
| 67 | STATUS1_READ_INCOMPLETE = 0x03, |
| 68 | STATUS1_WRITE_INCOMPLETE = 0x04, |
| 69 | STATUS1_SUCCESS = 0x05, |
| 70 | }; |
| 71 | |
| 72 | struct cp2112_smbus_config_report { |
| 73 | u8 report; /* CP2112_SMBUS_CONFIG */ |
| 74 | __be32 clock_speed; /* Hz */ |
| 75 | u8 device_address; /* Stored in the upper 7 bits */ |
| 76 | u8 auto_send_read; /* 1 = enabled, 0 = disabled */ |
| 77 | __be16 write_timeout; /* ms, 0 = no timeout */ |
| 78 | __be16 read_timeout; /* ms, 0 = no timeout */ |
| 79 | u8 scl_low_timeout; /* 1 = enabled, 0 = disabled */ |
| 80 | __be16 retry_time; /* # of retries, 0 = no limit */ |
| 81 | } __packed; |
| 82 | |
| 83 | struct cp2112_usb_config_report { |
| 84 | u8 report; /* CP2112_USB_CONFIG */ |
| 85 | __le16 vid; /* Vendor ID */ |
| 86 | __le16 pid; /* Product ID */ |
| 87 | u8 max_power; /* Power requested in 2mA units */ |
| 88 | u8 power_mode; /* 0x00 = bus powered |
| 89 | 0x01 = self powered & regulator off |
| 90 | 0x02 = self powered & regulator on */ |
| 91 | u8 release_major; |
| 92 | u8 release_minor; |
| 93 | u8 mask; /* What fields to program */ |
| 94 | } __packed; |
| 95 | |
| 96 | struct cp2112_read_req_report { |
| 97 | u8 report; /* CP2112_DATA_READ_REQUEST */ |
| 98 | u8 slave_address; |
| 99 | __be16 length; |
| 100 | } __packed; |
| 101 | |
| 102 | struct cp2112_write_read_req_report { |
| 103 | u8 report; /* CP2112_DATA_WRITE_READ_REQUEST */ |
| 104 | u8 slave_address; |
| 105 | __be16 length; |
| 106 | u8 target_address_length; |
| 107 | u8 target_address[16]; |
| 108 | } __packed; |
| 109 | |
| 110 | struct cp2112_write_req_report { |
| 111 | u8 report; /* CP2112_DATA_WRITE_REQUEST */ |
| 112 | u8 slave_address; |
| 113 | u8 length; |
| 114 | u8 data[61]; |
| 115 | } __packed; |
| 116 | |
| 117 | struct cp2112_force_read_report { |
| 118 | u8 report; /* CP2112_DATA_READ_FORCE_SEND */ |
| 119 | __be16 length; |
| 120 | } __packed; |
| 121 | |
| 122 | struct cp2112_xfer_status_report { |
| 123 | u8 report; /* CP2112_TRANSFER_STATUS_RESPONSE */ |
| 124 | u8 status0; /* STATUS0_* */ |
| 125 | u8 status1; /* STATUS1_* */ |
| 126 | __be16 retries; |
| 127 | __be16 length; |
| 128 | } __packed; |
| 129 | |
| 130 | struct cp2112_string_report { |
| 131 | u8 dummy; /* force .string to be aligned */ |
| 132 | u8 report; /* CP2112_*_STRING */ |
| 133 | u8 length; /* length in bytes of everyting after .report */ |
| 134 | u8 type; /* USB_DT_STRING */ |
| 135 | wchar_t string[30]; /* UTF16_LITTLE_ENDIAN string */ |
| 136 | } __packed; |
| 137 | |
| 138 | /* Number of times to request transfer status before giving up waiting for a |
| 139 | transfer to complete. This may need to be changed if SMBUS clock, retries, |
| 140 | or read/write/scl_low timeout settings are changed. */ |
| 141 | static const int XFER_STATUS_RETRIES = 10; |
| 142 | |
| 143 | /* Time in ms to wait for a CP2112_DATA_READ_RESPONSE or |
| 144 | CP2112_TRANSFER_STATUS_RESPONSE. */ |
| 145 | static const int RESPONSE_TIMEOUT = 50; |
| 146 | |
| 147 | static const struct hid_device_id cp2112_devices[] = { |
| 148 | { HID_USB_DEVICE(USB_VENDOR_ID_CYGNAL, USB_DEVICE_ID_CYGNAL_CP2112) }, |
| 149 | { } |
| 150 | }; |
| 151 | MODULE_DEVICE_TABLE(hid, cp2112_devices); |
| 152 | |
| 153 | struct cp2112_device { |
| 154 | struct i2c_adapter adap; |
| 155 | struct hid_device *hdev; |
| 156 | wait_queue_head_t wait; |
| 157 | u8 read_data[61]; |
| 158 | u8 read_length; |
| 159 | int xfer_status; |
| 160 | atomic_t read_avail; |
| 161 | atomic_t xfer_avail; |
| 162 | struct gpio_chip gc; |
| 163 | }; |
| 164 | |
| 165 | static int gpio_push_pull = 0xFF; |
| 166 | module_param(gpio_push_pull, int, S_IRUGO | S_IWUSR); |
| 167 | MODULE_PARM_DESC(gpio_push_pull, "GPIO push-pull configuration bitmask"); |
| 168 | |
| 169 | static int cp2112_gpio_direction_input(struct gpio_chip *chip, unsigned offset) |
| 170 | { |
| 171 | struct cp2112_device *dev = container_of(chip, struct cp2112_device, |
| 172 | gc); |
| 173 | struct hid_device *hdev = dev->hdev; |
| 174 | u8 buf[5]; |
| 175 | int ret; |
| 176 | |
Jiri Kosina | 490051a | 2014-02-18 00:39:39 +0100 | [diff] [blame] | 177 | ret = hid_hw_raw_request(hdev, CP2112_GPIO_CONFIG, buf, |
| 178 | sizeof(buf), HID_FEATURE_REPORT, |
| 179 | HID_REQ_GET_REPORT); |
David Barksdale | e932d81 | 2014-02-04 12:42:48 -0600 | [diff] [blame] | 180 | if (ret != sizeof(buf)) { |
| 181 | hid_err(hdev, "error requesting GPIO config: %d\n", ret); |
| 182 | return ret; |
| 183 | } |
| 184 | |
| 185 | buf[1] &= ~(1 << offset); |
| 186 | buf[2] = gpio_push_pull; |
| 187 | |
Benjamin Tissoires | 293e483 | 2014-03-08 22:52:40 -0500 | [diff] [blame] | 188 | ret = hid_hw_raw_request(hdev, CP2112_GPIO_CONFIG, buf, sizeof(buf), |
| 189 | HID_FEATURE_REPORT, HID_REQ_SET_REPORT); |
David Barksdale | e932d81 | 2014-02-04 12:42:48 -0600 | [diff] [blame] | 190 | if (ret < 0) { |
| 191 | hid_err(hdev, "error setting GPIO config: %d\n", ret); |
| 192 | return ret; |
| 193 | } |
| 194 | |
| 195 | return 0; |
| 196 | } |
| 197 | |
| 198 | static void cp2112_gpio_set(struct gpio_chip *chip, unsigned offset, int value) |
| 199 | { |
| 200 | struct cp2112_device *dev = container_of(chip, struct cp2112_device, |
| 201 | gc); |
| 202 | struct hid_device *hdev = dev->hdev; |
| 203 | u8 buf[3]; |
| 204 | int ret; |
| 205 | |
| 206 | buf[0] = CP2112_GPIO_SET; |
| 207 | buf[1] = value ? 0xff : 0; |
| 208 | buf[2] = 1 << offset; |
| 209 | |
Benjamin Tissoires | 293e483 | 2014-03-08 22:52:40 -0500 | [diff] [blame] | 210 | ret = hid_hw_raw_request(hdev, CP2112_GPIO_SET, buf, sizeof(buf), |
| 211 | HID_FEATURE_REPORT, HID_REQ_SET_REPORT); |
David Barksdale | e932d81 | 2014-02-04 12:42:48 -0600 | [diff] [blame] | 212 | if (ret < 0) |
| 213 | hid_err(hdev, "error setting GPIO values: %d\n", ret); |
| 214 | } |
| 215 | |
| 216 | static int cp2112_gpio_get(struct gpio_chip *chip, unsigned offset) |
| 217 | { |
| 218 | struct cp2112_device *dev = container_of(chip, struct cp2112_device, |
| 219 | gc); |
| 220 | struct hid_device *hdev = dev->hdev; |
| 221 | u8 buf[2]; |
| 222 | int ret; |
| 223 | |
Jiri Kosina | 490051a | 2014-02-18 00:39:39 +0100 | [diff] [blame] | 224 | ret = hid_hw_raw_request(hdev, CP2112_GPIO_GET, buf, sizeof(buf), |
| 225 | HID_FEATURE_REPORT, HID_REQ_GET_REPORT); |
David Barksdale | e932d81 | 2014-02-04 12:42:48 -0600 | [diff] [blame] | 226 | if (ret != sizeof(buf)) { |
| 227 | hid_err(hdev, "error requesting GPIO values: %d\n", ret); |
| 228 | return ret; |
| 229 | } |
| 230 | |
| 231 | return (buf[1] >> offset) & 1; |
| 232 | } |
| 233 | |
| 234 | static int cp2112_gpio_direction_output(struct gpio_chip *chip, |
| 235 | unsigned offset, int value) |
| 236 | { |
| 237 | struct cp2112_device *dev = container_of(chip, struct cp2112_device, |
| 238 | gc); |
| 239 | struct hid_device *hdev = dev->hdev; |
| 240 | u8 buf[5]; |
| 241 | int ret; |
| 242 | |
| 243 | cp2112_gpio_set(chip, offset, value); |
| 244 | |
Jiri Kosina | 490051a | 2014-02-18 00:39:39 +0100 | [diff] [blame] | 245 | ret = hid_hw_raw_request(hdev, CP2112_GPIO_CONFIG, buf, |
| 246 | sizeof(buf), HID_FEATURE_REPORT, |
| 247 | HID_REQ_GET_REPORT); |
David Barksdale | e932d81 | 2014-02-04 12:42:48 -0600 | [diff] [blame] | 248 | if (ret != sizeof(buf)) { |
| 249 | hid_err(hdev, "error requesting GPIO config: %d\n", ret); |
| 250 | return ret; |
| 251 | } |
| 252 | |
| 253 | buf[1] |= 1 << offset; |
| 254 | buf[2] = gpio_push_pull; |
| 255 | |
Benjamin Tissoires | 293e483 | 2014-03-08 22:52:40 -0500 | [diff] [blame] | 256 | ret = hid_hw_raw_request(hdev, CP2112_GPIO_CONFIG, buf, sizeof(buf), |
| 257 | HID_FEATURE_REPORT, HID_REQ_SET_REPORT); |
David Barksdale | e932d81 | 2014-02-04 12:42:48 -0600 | [diff] [blame] | 258 | if (ret < 0) { |
| 259 | hid_err(hdev, "error setting GPIO config: %d\n", ret); |
| 260 | return ret; |
| 261 | } |
| 262 | |
| 263 | return 0; |
| 264 | } |
| 265 | |
| 266 | static int cp2112_hid_get(struct hid_device *hdev, unsigned char report_number, |
| 267 | u8 *data, size_t count, unsigned char report_type) |
| 268 | { |
| 269 | u8 *buf; |
| 270 | int ret; |
| 271 | |
| 272 | buf = kmalloc(count, GFP_KERNEL); |
| 273 | if (!buf) |
| 274 | return -ENOMEM; |
| 275 | |
Jiri Kosina | 490051a | 2014-02-18 00:39:39 +0100 | [diff] [blame] | 276 | ret = hid_hw_raw_request(hdev, report_number, buf, count, |
| 277 | report_type, HID_REQ_GET_REPORT); |
David Barksdale | e932d81 | 2014-02-04 12:42:48 -0600 | [diff] [blame] | 278 | memcpy(data, buf, count); |
| 279 | kfree(buf); |
| 280 | return ret; |
| 281 | } |
| 282 | |
| 283 | static int cp2112_hid_output(struct hid_device *hdev, u8 *data, size_t count, |
| 284 | unsigned char report_type) |
| 285 | { |
| 286 | u8 *buf; |
| 287 | int ret; |
| 288 | |
| 289 | buf = kmemdup(data, count, GFP_KERNEL); |
| 290 | if (!buf) |
| 291 | return -ENOMEM; |
| 292 | |
Benjamin Tissoires | 866e479 | 2014-03-08 22:52:41 -0500 | [diff] [blame] | 293 | if (report_type == HID_OUTPUT_REPORT) |
| 294 | ret = hid_hw_output_report(hdev, buf, count); |
| 295 | else |
| 296 | ret = hid_hw_raw_request(hdev, buf[0], buf, count, report_type, |
| 297 | HID_REQ_SET_REPORT); |
| 298 | |
David Barksdale | e932d81 | 2014-02-04 12:42:48 -0600 | [diff] [blame] | 299 | kfree(buf); |
| 300 | return ret; |
| 301 | } |
| 302 | |
| 303 | static int cp2112_wait(struct cp2112_device *dev, atomic_t *avail) |
| 304 | { |
| 305 | int ret = 0; |
| 306 | |
| 307 | /* We have sent either a CP2112_TRANSFER_STATUS_REQUEST or a |
| 308 | * CP2112_DATA_READ_FORCE_SEND and we are waiting for the response to |
| 309 | * come in cp2112_raw_event or timeout. There will only be one of these |
| 310 | * in flight at any one time. The timeout is extremely large and is a |
| 311 | * last resort if the CP2112 has died. If we do timeout we don't expect |
| 312 | * to receive the response which would cause data races, it's not like |
| 313 | * we can do anything about it anyway. |
| 314 | */ |
| 315 | ret = wait_event_interruptible_timeout(dev->wait, |
| 316 | atomic_read(avail), msecs_to_jiffies(RESPONSE_TIMEOUT)); |
| 317 | if (-ERESTARTSYS == ret) |
| 318 | return ret; |
| 319 | if (!ret) |
| 320 | return -ETIMEDOUT; |
| 321 | |
| 322 | atomic_set(avail, 0); |
| 323 | return 0; |
| 324 | } |
| 325 | |
| 326 | static int cp2112_xfer_status(struct cp2112_device *dev) |
| 327 | { |
| 328 | struct hid_device *hdev = dev->hdev; |
| 329 | u8 buf[2]; |
| 330 | int ret; |
| 331 | |
| 332 | buf[0] = CP2112_TRANSFER_STATUS_REQUEST; |
| 333 | buf[1] = 0x01; |
| 334 | atomic_set(&dev->xfer_avail, 0); |
| 335 | |
| 336 | ret = cp2112_hid_output(hdev, buf, 2, HID_OUTPUT_REPORT); |
| 337 | if (ret < 0) { |
| 338 | hid_warn(hdev, "Error requesting status: %d\n", ret); |
| 339 | return ret; |
| 340 | } |
| 341 | |
| 342 | ret = cp2112_wait(dev, &dev->xfer_avail); |
| 343 | if (ret) |
| 344 | return ret; |
| 345 | |
| 346 | return dev->xfer_status; |
| 347 | } |
| 348 | |
| 349 | static int cp2112_read(struct cp2112_device *dev, u8 *data, size_t size) |
| 350 | { |
| 351 | struct hid_device *hdev = dev->hdev; |
| 352 | struct cp2112_force_read_report report; |
| 353 | int ret; |
| 354 | |
| 355 | report.report = CP2112_DATA_READ_FORCE_SEND; |
| 356 | report.length = cpu_to_be16(size); |
| 357 | |
| 358 | atomic_set(&dev->read_avail, 0); |
| 359 | |
| 360 | ret = cp2112_hid_output(hdev, &report.report, sizeof(report), |
| 361 | HID_OUTPUT_REPORT); |
| 362 | if (ret < 0) { |
| 363 | hid_warn(hdev, "Error requesting data: %d\n", ret); |
| 364 | return ret; |
| 365 | } |
| 366 | |
| 367 | ret = cp2112_wait(dev, &dev->read_avail); |
| 368 | if (ret) |
| 369 | return ret; |
| 370 | |
Jiri Kosina | 5a673fc | 2014-02-17 23:44:54 +0100 | [diff] [blame] | 371 | hid_dbg(hdev, "read %d of %zd bytes requested\n", |
David Barksdale | e932d81 | 2014-02-04 12:42:48 -0600 | [diff] [blame] | 372 | dev->read_length, size); |
| 373 | |
| 374 | if (size > dev->read_length) |
| 375 | size = dev->read_length; |
| 376 | |
| 377 | memcpy(data, dev->read_data, size); |
| 378 | return dev->read_length; |
| 379 | } |
| 380 | |
| 381 | static int cp2112_read_req(void *buf, u8 slave_address, u16 length) |
| 382 | { |
| 383 | struct cp2112_read_req_report *report = buf; |
| 384 | |
| 385 | if (length < 1 || length > 512) |
| 386 | return -EINVAL; |
| 387 | |
| 388 | report->report = CP2112_DATA_READ_REQUEST; |
| 389 | report->slave_address = slave_address << 1; |
| 390 | report->length = cpu_to_be16(length); |
| 391 | return sizeof(*report); |
| 392 | } |
| 393 | |
| 394 | static int cp2112_write_read_req(void *buf, u8 slave_address, u16 length, |
| 395 | u8 command, u8 *data, u8 data_length) |
| 396 | { |
| 397 | struct cp2112_write_read_req_report *report = buf; |
| 398 | |
| 399 | if (length < 1 || length > 512 |
| 400 | || data_length > sizeof(report->target_address) - 1) |
| 401 | return -EINVAL; |
| 402 | |
| 403 | report->report = CP2112_DATA_WRITE_READ_REQUEST; |
| 404 | report->slave_address = slave_address << 1; |
| 405 | report->length = cpu_to_be16(length); |
| 406 | report->target_address_length = data_length + 1; |
| 407 | report->target_address[0] = command; |
| 408 | memcpy(&report->target_address[1], data, data_length); |
| 409 | return data_length + 6; |
| 410 | } |
| 411 | |
| 412 | static int cp2112_write_req(void *buf, u8 slave_address, u8 command, u8 *data, |
| 413 | u8 data_length) |
| 414 | { |
| 415 | struct cp2112_write_req_report *report = buf; |
| 416 | |
| 417 | if (data_length > sizeof(report->data) - 1) |
| 418 | return -EINVAL; |
| 419 | |
| 420 | report->report = CP2112_DATA_WRITE_REQUEST; |
| 421 | report->slave_address = slave_address << 1; |
| 422 | report->length = data_length + 1; |
| 423 | report->data[0] = command; |
| 424 | memcpy(&report->data[1], data, data_length); |
| 425 | return data_length + 4; |
| 426 | } |
| 427 | |
| 428 | static int cp2112_xfer(struct i2c_adapter *adap, u16 addr, |
| 429 | unsigned short flags, char read_write, u8 command, |
| 430 | int size, union i2c_smbus_data *data) |
| 431 | { |
| 432 | struct cp2112_device *dev = (struct cp2112_device *)adap->algo_data; |
| 433 | struct hid_device *hdev = dev->hdev; |
| 434 | u8 buf[64]; |
| 435 | __be16 word; |
Jiri Kosina | 0438ee7 | 2014-02-18 09:43:53 +0100 | [diff] [blame] | 436 | ssize_t count; |
David Barksdale | e932d81 | 2014-02-04 12:42:48 -0600 | [diff] [blame] | 437 | size_t read_length = 0; |
| 438 | unsigned int retries; |
| 439 | int ret; |
| 440 | |
| 441 | hid_dbg(hdev, "%s addr 0x%x flags 0x%x cmd 0x%x size %d\n", |
| 442 | read_write == I2C_SMBUS_WRITE ? "write" : "read", |
| 443 | addr, flags, command, size); |
| 444 | |
| 445 | switch (size) { |
| 446 | case I2C_SMBUS_BYTE: |
| 447 | read_length = 1; |
| 448 | |
| 449 | if (I2C_SMBUS_READ == read_write) |
| 450 | count = cp2112_read_req(buf, addr, read_length); |
| 451 | else |
| 452 | count = cp2112_write_req(buf, addr, data->byte, NULL, |
| 453 | 0); |
| 454 | break; |
| 455 | case I2C_SMBUS_BYTE_DATA: |
| 456 | read_length = 1; |
| 457 | |
| 458 | if (I2C_SMBUS_READ == read_write) |
| 459 | count = cp2112_write_read_req(buf, addr, read_length, |
| 460 | command, NULL, 0); |
| 461 | else |
| 462 | count = cp2112_write_req(buf, addr, command, |
| 463 | &data->byte, 1); |
| 464 | break; |
| 465 | case I2C_SMBUS_WORD_DATA: |
| 466 | read_length = 2; |
| 467 | word = cpu_to_be16(data->word); |
| 468 | |
| 469 | if (I2C_SMBUS_READ == read_write) |
| 470 | count = cp2112_write_read_req(buf, addr, read_length, |
| 471 | command, NULL, 0); |
| 472 | else |
| 473 | count = cp2112_write_req(buf, addr, command, |
| 474 | (u8 *)&word, 2); |
| 475 | break; |
| 476 | case I2C_SMBUS_PROC_CALL: |
| 477 | size = I2C_SMBUS_WORD_DATA; |
| 478 | read_write = I2C_SMBUS_READ; |
| 479 | read_length = 2; |
| 480 | word = cpu_to_be16(data->word); |
| 481 | |
| 482 | count = cp2112_write_read_req(buf, addr, read_length, command, |
| 483 | (u8 *)&word, 2); |
| 484 | break; |
| 485 | case I2C_SMBUS_I2C_BLOCK_DATA: |
| 486 | size = I2C_SMBUS_BLOCK_DATA; |
| 487 | /* fallthrough */ |
| 488 | case I2C_SMBUS_BLOCK_DATA: |
| 489 | if (I2C_SMBUS_READ == read_write) { |
| 490 | count = cp2112_write_read_req(buf, addr, |
| 491 | I2C_SMBUS_BLOCK_MAX, |
| 492 | command, NULL, 0); |
| 493 | } else { |
| 494 | count = cp2112_write_req(buf, addr, command, |
| 495 | data->block, |
| 496 | data->block[0] + 1); |
| 497 | } |
| 498 | break; |
| 499 | case I2C_SMBUS_BLOCK_PROC_CALL: |
| 500 | size = I2C_SMBUS_BLOCK_DATA; |
| 501 | read_write = I2C_SMBUS_READ; |
| 502 | |
| 503 | count = cp2112_write_read_req(buf, addr, I2C_SMBUS_BLOCK_MAX, |
| 504 | command, data->block, |
| 505 | data->block[0] + 1); |
| 506 | break; |
| 507 | default: |
| 508 | hid_warn(hdev, "Unsupported transaction %d\n", size); |
| 509 | return -EOPNOTSUPP; |
| 510 | } |
| 511 | |
| 512 | if (count < 0) |
| 513 | return count; |
| 514 | |
| 515 | ret = hid_hw_power(hdev, PM_HINT_FULLON); |
| 516 | if (ret < 0) { |
| 517 | hid_err(hdev, "power management error: %d\n", ret); |
| 518 | return ret; |
| 519 | } |
| 520 | |
| 521 | ret = cp2112_hid_output(hdev, buf, count, HID_OUTPUT_REPORT); |
| 522 | if (ret < 0) { |
| 523 | hid_warn(hdev, "Error starting transaction: %d\n", ret); |
| 524 | goto power_normal; |
| 525 | } |
| 526 | |
| 527 | for (retries = 0; retries < XFER_STATUS_RETRIES; ++retries) { |
| 528 | ret = cp2112_xfer_status(dev); |
| 529 | if (-EBUSY == ret) |
| 530 | continue; |
| 531 | if (ret < 0) |
| 532 | goto power_normal; |
| 533 | break; |
| 534 | } |
| 535 | |
| 536 | if (XFER_STATUS_RETRIES <= retries) { |
| 537 | hid_warn(hdev, "Transfer timed out, cancelling.\n"); |
| 538 | buf[0] = CP2112_CANCEL_TRANSFER; |
| 539 | buf[1] = 0x01; |
| 540 | |
| 541 | ret = cp2112_hid_output(hdev, buf, 2, HID_OUTPUT_REPORT); |
| 542 | if (ret < 0) |
| 543 | hid_warn(hdev, "Error cancelling transaction: %d\n", |
| 544 | ret); |
| 545 | |
| 546 | ret = -ETIMEDOUT; |
| 547 | goto power_normal; |
| 548 | } |
| 549 | |
| 550 | if (I2C_SMBUS_WRITE == read_write) { |
| 551 | ret = 0; |
| 552 | goto power_normal; |
| 553 | } |
| 554 | |
| 555 | if (I2C_SMBUS_BLOCK_DATA == size) |
| 556 | read_length = ret; |
| 557 | |
| 558 | ret = cp2112_read(dev, buf, read_length); |
| 559 | if (ret < 0) |
| 560 | goto power_normal; |
| 561 | if (ret != read_length) { |
Jiri Kosina | 5a673fc | 2014-02-17 23:44:54 +0100 | [diff] [blame] | 562 | hid_warn(hdev, "short read: %d < %zd\n", ret, read_length); |
David Barksdale | e932d81 | 2014-02-04 12:42:48 -0600 | [diff] [blame] | 563 | ret = -EIO; |
| 564 | goto power_normal; |
| 565 | } |
| 566 | |
| 567 | switch (size) { |
| 568 | case I2C_SMBUS_BYTE: |
| 569 | case I2C_SMBUS_BYTE_DATA: |
| 570 | data->byte = buf[0]; |
| 571 | break; |
| 572 | case I2C_SMBUS_WORD_DATA: |
| 573 | data->word = be16_to_cpup((__be16 *)buf); |
| 574 | break; |
| 575 | case I2C_SMBUS_BLOCK_DATA: |
| 576 | if (read_length > I2C_SMBUS_BLOCK_MAX) { |
| 577 | ret = -EPROTO; |
| 578 | goto power_normal; |
| 579 | } |
| 580 | |
| 581 | memcpy(data->block, buf, read_length); |
| 582 | break; |
| 583 | } |
| 584 | |
| 585 | ret = 0; |
| 586 | power_normal: |
| 587 | hid_hw_power(hdev, PM_HINT_NORMAL); |
| 588 | hid_dbg(hdev, "transfer finished: %d\n", ret); |
| 589 | return ret; |
| 590 | } |
| 591 | |
| 592 | static u32 cp2112_functionality(struct i2c_adapter *adap) |
| 593 | { |
| 594 | return I2C_FUNC_SMBUS_BYTE | |
| 595 | I2C_FUNC_SMBUS_BYTE_DATA | |
| 596 | I2C_FUNC_SMBUS_WORD_DATA | |
| 597 | I2C_FUNC_SMBUS_BLOCK_DATA | |
| 598 | I2C_FUNC_SMBUS_I2C_BLOCK | |
| 599 | I2C_FUNC_SMBUS_PROC_CALL | |
| 600 | I2C_FUNC_SMBUS_BLOCK_PROC_CALL; |
| 601 | } |
| 602 | |
| 603 | static const struct i2c_algorithm smbus_algorithm = { |
| 604 | .smbus_xfer = cp2112_xfer, |
| 605 | .functionality = cp2112_functionality, |
| 606 | }; |
| 607 | |
| 608 | static int cp2112_get_usb_config(struct hid_device *hdev, |
| 609 | struct cp2112_usb_config_report *cfg) |
| 610 | { |
| 611 | int ret; |
| 612 | |
| 613 | ret = cp2112_hid_get(hdev, CP2112_USB_CONFIG, (u8 *)cfg, sizeof(*cfg), |
| 614 | HID_FEATURE_REPORT); |
| 615 | if (ret != sizeof(*cfg)) { |
| 616 | hid_err(hdev, "error reading usb config: %d\n", ret); |
| 617 | if (ret < 0) |
| 618 | return ret; |
| 619 | return -EIO; |
| 620 | } |
| 621 | |
| 622 | return 0; |
| 623 | } |
| 624 | |
| 625 | static int cp2112_set_usb_config(struct hid_device *hdev, |
| 626 | struct cp2112_usb_config_report *cfg) |
| 627 | { |
| 628 | int ret; |
| 629 | |
| 630 | BUG_ON(cfg->report != CP2112_USB_CONFIG); |
| 631 | |
| 632 | ret = cp2112_hid_output(hdev, (u8 *)cfg, sizeof(*cfg), |
| 633 | HID_FEATURE_REPORT); |
| 634 | if (ret != sizeof(*cfg)) { |
| 635 | hid_err(hdev, "error writing usb config: %d\n", ret); |
| 636 | if (ret < 0) |
| 637 | return ret; |
| 638 | return -EIO; |
| 639 | } |
| 640 | |
| 641 | return 0; |
| 642 | } |
| 643 | |
| 644 | static void chmod_sysfs_attrs(struct hid_device *hdev); |
| 645 | |
| 646 | #define CP2112_CONFIG_ATTR(name, store, format, ...) \ |
| 647 | static ssize_t name##_store(struct device *kdev, \ |
| 648 | struct device_attribute *attr, const char *buf, \ |
| 649 | size_t count) \ |
| 650 | { \ |
| 651 | struct hid_device *hdev = container_of(kdev, struct hid_device, dev); \ |
| 652 | struct cp2112_usb_config_report cfg; \ |
| 653 | int ret = cp2112_get_usb_config(hdev, &cfg); \ |
| 654 | if (ret) \ |
| 655 | return ret; \ |
| 656 | store; \ |
| 657 | ret = cp2112_set_usb_config(hdev, &cfg); \ |
| 658 | if (ret) \ |
| 659 | return ret; \ |
| 660 | chmod_sysfs_attrs(hdev); \ |
| 661 | return count; \ |
| 662 | } \ |
| 663 | static ssize_t name##_show(struct device *kdev, \ |
| 664 | struct device_attribute *attr, char *buf) \ |
| 665 | { \ |
| 666 | struct hid_device *hdev = container_of(kdev, struct hid_device, dev); \ |
| 667 | struct cp2112_usb_config_report cfg; \ |
| 668 | int ret = cp2112_get_usb_config(hdev, &cfg); \ |
| 669 | if (ret) \ |
| 670 | return ret; \ |
| 671 | return scnprintf(buf, PAGE_SIZE, format, ##__VA_ARGS__); \ |
| 672 | } \ |
Jiri Kosina | c3c041b | 2014-02-17 23:40:20 +0100 | [diff] [blame] | 673 | static DEVICE_ATTR_RW(name); |
David Barksdale | e932d81 | 2014-02-04 12:42:48 -0600 | [diff] [blame] | 674 | |
| 675 | CP2112_CONFIG_ATTR(vendor_id, ({ |
| 676 | u16 vid; |
| 677 | |
| 678 | if (sscanf(buf, "%hi", &vid) != 1) |
| 679 | return -EINVAL; |
| 680 | |
| 681 | cfg.vid = cpu_to_le16(vid); |
| 682 | cfg.mask = 0x01; |
| 683 | }), "0x%04x\n", le16_to_cpu(cfg.vid)); |
| 684 | |
| 685 | CP2112_CONFIG_ATTR(product_id, ({ |
| 686 | u16 pid; |
| 687 | |
| 688 | if (sscanf(buf, "%hi", &pid) != 1) |
| 689 | return -EINVAL; |
| 690 | |
| 691 | cfg.pid = cpu_to_le16(pid); |
| 692 | cfg.mask = 0x02; |
| 693 | }), "0x%04x\n", le16_to_cpu(cfg.pid)); |
| 694 | |
| 695 | CP2112_CONFIG_ATTR(max_power, ({ |
| 696 | int mA; |
| 697 | |
| 698 | if (sscanf(buf, "%i", &mA) != 1) |
| 699 | return -EINVAL; |
| 700 | |
| 701 | cfg.max_power = (mA + 1) / 2; |
| 702 | cfg.mask = 0x04; |
| 703 | }), "%u mA\n", cfg.max_power * 2); |
| 704 | |
| 705 | CP2112_CONFIG_ATTR(power_mode, ({ |
| 706 | if (sscanf(buf, "%hhi", &cfg.power_mode) != 1) |
| 707 | return -EINVAL; |
| 708 | |
| 709 | cfg.mask = 0x08; |
| 710 | }), "%u\n", cfg.power_mode); |
| 711 | |
| 712 | CP2112_CONFIG_ATTR(release_version, ({ |
| 713 | if (sscanf(buf, "%hhi.%hhi", &cfg.release_major, &cfg.release_minor) |
| 714 | != 2) |
| 715 | return -EINVAL; |
| 716 | |
| 717 | cfg.mask = 0x10; |
| 718 | }), "%u.%u\n", cfg.release_major, cfg.release_minor); |
| 719 | |
| 720 | #undef CP2112_CONFIG_ATTR |
| 721 | |
| 722 | struct cp2112_pstring_attribute { |
| 723 | struct device_attribute attr; |
| 724 | unsigned char report; |
| 725 | }; |
| 726 | |
| 727 | static ssize_t pstr_store(struct device *kdev, |
| 728 | struct device_attribute *kattr, const char *buf, |
| 729 | size_t count) |
| 730 | { |
| 731 | struct hid_device *hdev = container_of(kdev, struct hid_device, dev); |
| 732 | struct cp2112_pstring_attribute *attr = |
| 733 | container_of(kattr, struct cp2112_pstring_attribute, attr); |
| 734 | struct cp2112_string_report report; |
| 735 | int ret; |
| 736 | |
| 737 | memset(&report, 0, sizeof(report)); |
| 738 | |
| 739 | ret = utf8s_to_utf16s(buf, count, UTF16_LITTLE_ENDIAN, |
| 740 | report.string, ARRAY_SIZE(report.string)); |
| 741 | report.report = attr->report; |
| 742 | report.length = ret * sizeof(report.string[0]) + 2; |
| 743 | report.type = USB_DT_STRING; |
| 744 | |
| 745 | ret = cp2112_hid_output(hdev, &report.report, report.length + 1, |
| 746 | HID_FEATURE_REPORT); |
| 747 | if (ret != report.length + 1) { |
| 748 | hid_err(hdev, "error writing %s string: %d\n", kattr->attr.name, |
| 749 | ret); |
| 750 | if (ret < 0) |
| 751 | return ret; |
| 752 | return -EIO; |
| 753 | } |
| 754 | |
| 755 | chmod_sysfs_attrs(hdev); |
| 756 | return count; |
| 757 | } |
| 758 | |
| 759 | static ssize_t pstr_show(struct device *kdev, |
| 760 | struct device_attribute *kattr, char *buf) |
| 761 | { |
| 762 | struct hid_device *hdev = container_of(kdev, struct hid_device, dev); |
| 763 | struct cp2112_pstring_attribute *attr = |
| 764 | container_of(kattr, struct cp2112_pstring_attribute, attr); |
| 765 | struct cp2112_string_report report; |
| 766 | u8 length; |
| 767 | int ret; |
| 768 | |
| 769 | ret = cp2112_hid_get(hdev, attr->report, &report.report, |
| 770 | sizeof(report) - 1, HID_FEATURE_REPORT); |
| 771 | if (ret < 3) { |
| 772 | hid_err(hdev, "error reading %s string: %d\n", kattr->attr.name, |
| 773 | ret); |
| 774 | if (ret < 0) |
| 775 | return ret; |
| 776 | return -EIO; |
| 777 | } |
| 778 | |
| 779 | if (report.length < 2) { |
| 780 | hid_err(hdev, "invalid %s string length: %d\n", |
| 781 | kattr->attr.name, report.length); |
| 782 | return -EIO; |
| 783 | } |
| 784 | |
| 785 | length = report.length > ret - 1 ? ret - 1 : report.length; |
| 786 | length = (length - 2) / sizeof(report.string[0]); |
| 787 | ret = utf16s_to_utf8s(report.string, length, UTF16_LITTLE_ENDIAN, buf, |
| 788 | PAGE_SIZE - 1); |
| 789 | buf[ret++] = '\n'; |
| 790 | return ret; |
| 791 | } |
| 792 | |
| 793 | #define CP2112_PSTR_ATTR(name, _report) \ |
Jiri Kosina | c3c041b | 2014-02-17 23:40:20 +0100 | [diff] [blame] | 794 | static struct cp2112_pstring_attribute dev_attr_##name = { \ |
David Barksdale | e932d81 | 2014-02-04 12:42:48 -0600 | [diff] [blame] | 795 | .attr = __ATTR(name, (S_IWUSR | S_IRUGO), pstr_show, pstr_store), \ |
| 796 | .report = _report, \ |
| 797 | }; |
| 798 | |
| 799 | CP2112_PSTR_ATTR(manufacturer, CP2112_MANUFACTURER_STRING); |
| 800 | CP2112_PSTR_ATTR(product, CP2112_PRODUCT_STRING); |
| 801 | CP2112_PSTR_ATTR(serial, CP2112_SERIAL_STRING); |
| 802 | |
| 803 | #undef CP2112_PSTR_ATTR |
| 804 | |
| 805 | static const struct attribute_group cp2112_attr_group = { |
| 806 | .attrs = (struct attribute *[]){ |
| 807 | &dev_attr_vendor_id.attr, |
| 808 | &dev_attr_product_id.attr, |
| 809 | &dev_attr_max_power.attr, |
| 810 | &dev_attr_power_mode.attr, |
| 811 | &dev_attr_release_version.attr, |
| 812 | &dev_attr_manufacturer.attr.attr, |
| 813 | &dev_attr_product.attr.attr, |
| 814 | &dev_attr_serial.attr.attr, |
| 815 | NULL |
| 816 | } |
| 817 | }; |
| 818 | |
| 819 | /* Chmoding our sysfs attributes is simply a way to expose which fields in the |
| 820 | * PROM have already been programmed. We do not depend on this preventing |
| 821 | * writing to these attributes since the CP2112 will simply ignore writes to |
| 822 | * already-programmed fields. This is why there is no sense in fixing this |
| 823 | * racy behaviour. |
| 824 | */ |
| 825 | static void chmod_sysfs_attrs(struct hid_device *hdev) |
| 826 | { |
| 827 | struct attribute **attr; |
| 828 | u8 buf[2]; |
| 829 | int ret; |
| 830 | |
| 831 | ret = cp2112_hid_get(hdev, CP2112_LOCK_BYTE, buf, sizeof(buf), |
| 832 | HID_FEATURE_REPORT); |
| 833 | if (ret != sizeof(buf)) { |
| 834 | hid_err(hdev, "error reading lock byte: %d\n", ret); |
| 835 | return; |
| 836 | } |
| 837 | |
| 838 | for (attr = cp2112_attr_group.attrs; *attr; ++attr) { |
| 839 | umode_t mode = (buf[1] & 1) ? S_IWUSR | S_IRUGO : S_IRUGO; |
| 840 | ret = sysfs_chmod_file(&hdev->dev.kobj, *attr, mode); |
| 841 | if (ret < 0) |
| 842 | hid_err(hdev, "error chmoding sysfs file %s\n", |
| 843 | (*attr)->name); |
| 844 | buf[1] >>= 1; |
| 845 | } |
| 846 | } |
| 847 | |
| 848 | static int cp2112_probe(struct hid_device *hdev, const struct hid_device_id *id) |
| 849 | { |
| 850 | struct cp2112_device *dev; |
| 851 | u8 buf[3]; |
| 852 | struct cp2112_smbus_config_report config; |
| 853 | int ret; |
| 854 | |
| 855 | ret = hid_parse(hdev); |
| 856 | if (ret) { |
| 857 | hid_err(hdev, "parse failed\n"); |
| 858 | return ret; |
| 859 | } |
| 860 | |
| 861 | ret = hid_hw_start(hdev, HID_CONNECT_HIDRAW); |
| 862 | if (ret) { |
| 863 | hid_err(hdev, "hw start failed\n"); |
| 864 | return ret; |
| 865 | } |
| 866 | |
| 867 | ret = hid_hw_open(hdev); |
| 868 | if (ret) { |
| 869 | hid_err(hdev, "hw open failed\n"); |
| 870 | goto err_hid_stop; |
| 871 | } |
| 872 | |
| 873 | ret = hid_hw_power(hdev, PM_HINT_FULLON); |
| 874 | if (ret < 0) { |
| 875 | hid_err(hdev, "power management error: %d\n", ret); |
| 876 | goto err_hid_close; |
| 877 | } |
| 878 | |
| 879 | ret = cp2112_hid_get(hdev, CP2112_GET_VERSION_INFO, buf, sizeof(buf), |
| 880 | HID_FEATURE_REPORT); |
| 881 | if (ret != sizeof(buf)) { |
| 882 | hid_err(hdev, "error requesting version\n"); |
| 883 | if (ret >= 0) |
| 884 | ret = -EIO; |
| 885 | goto err_power_normal; |
| 886 | } |
| 887 | |
| 888 | hid_info(hdev, "Part Number: 0x%02X Device Version: 0x%02X\n", |
| 889 | buf[1], buf[2]); |
| 890 | |
| 891 | ret = cp2112_hid_get(hdev, CP2112_SMBUS_CONFIG, (u8 *)&config, |
| 892 | sizeof(config), HID_FEATURE_REPORT); |
| 893 | if (ret != sizeof(config)) { |
| 894 | hid_err(hdev, "error requesting SMBus config\n"); |
| 895 | if (ret >= 0) |
| 896 | ret = -EIO; |
| 897 | goto err_power_normal; |
| 898 | } |
| 899 | |
| 900 | config.retry_time = cpu_to_be16(1); |
| 901 | |
| 902 | ret = cp2112_hid_output(hdev, (u8 *)&config, sizeof(config), |
| 903 | HID_FEATURE_REPORT); |
| 904 | if (ret != sizeof(config)) { |
| 905 | hid_err(hdev, "error setting SMBus config\n"); |
| 906 | if (ret >= 0) |
| 907 | ret = -EIO; |
| 908 | goto err_power_normal; |
| 909 | } |
| 910 | |
| 911 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); |
| 912 | if (!dev) { |
| 913 | ret = -ENOMEM; |
| 914 | goto err_power_normal; |
| 915 | } |
| 916 | |
| 917 | hid_set_drvdata(hdev, (void *)dev); |
| 918 | dev->hdev = hdev; |
| 919 | dev->adap.owner = THIS_MODULE; |
| 920 | dev->adap.class = I2C_CLASS_HWMON; |
| 921 | dev->adap.algo = &smbus_algorithm; |
| 922 | dev->adap.algo_data = dev; |
| 923 | dev->adap.dev.parent = &hdev->dev; |
| 924 | snprintf(dev->adap.name, sizeof(dev->adap.name), |
| 925 | "CP2112 SMBus Bridge on hiddev%d", hdev->minor); |
| 926 | init_waitqueue_head(&dev->wait); |
| 927 | |
| 928 | hid_device_io_start(hdev); |
| 929 | ret = i2c_add_adapter(&dev->adap); |
| 930 | hid_device_io_stop(hdev); |
| 931 | |
| 932 | if (ret) { |
| 933 | hid_err(hdev, "error registering i2c adapter\n"); |
| 934 | goto err_free_dev; |
| 935 | } |
| 936 | |
| 937 | hid_dbg(hdev, "adapter registered\n"); |
| 938 | |
| 939 | dev->gc.label = "cp2112_gpio"; |
| 940 | dev->gc.direction_input = cp2112_gpio_direction_input; |
| 941 | dev->gc.direction_output = cp2112_gpio_direction_output; |
| 942 | dev->gc.set = cp2112_gpio_set; |
| 943 | dev->gc.get = cp2112_gpio_get; |
| 944 | dev->gc.base = -1; |
| 945 | dev->gc.ngpio = 8; |
| 946 | dev->gc.can_sleep = 1; |
| 947 | dev->gc.dev = &hdev->dev; |
| 948 | |
| 949 | ret = gpiochip_add(&dev->gc); |
| 950 | if (ret < 0) { |
| 951 | hid_err(hdev, "error registering gpio chip\n"); |
| 952 | goto err_free_i2c; |
| 953 | } |
| 954 | |
| 955 | ret = sysfs_create_group(&hdev->dev.kobj, &cp2112_attr_group); |
| 956 | if (ret < 0) { |
| 957 | hid_err(hdev, "error creating sysfs attrs\n"); |
| 958 | goto err_gpiochip_remove; |
| 959 | } |
| 960 | |
| 961 | chmod_sysfs_attrs(hdev); |
| 962 | hid_hw_power(hdev, PM_HINT_NORMAL); |
| 963 | |
| 964 | return ret; |
| 965 | |
| 966 | err_gpiochip_remove: |
| 967 | if (gpiochip_remove(&dev->gc) < 0) |
| 968 | hid_err(hdev, "error removing gpio chip\n"); |
| 969 | err_free_i2c: |
| 970 | i2c_del_adapter(&dev->adap); |
| 971 | err_free_dev: |
| 972 | kfree(dev); |
| 973 | err_power_normal: |
| 974 | hid_hw_power(hdev, PM_HINT_NORMAL); |
| 975 | err_hid_close: |
| 976 | hid_hw_close(hdev); |
| 977 | err_hid_stop: |
| 978 | hid_hw_stop(hdev); |
| 979 | return ret; |
| 980 | } |
| 981 | |
| 982 | static void cp2112_remove(struct hid_device *hdev) |
| 983 | { |
| 984 | struct cp2112_device *dev = hid_get_drvdata(hdev); |
| 985 | |
| 986 | sysfs_remove_group(&hdev->dev.kobj, &cp2112_attr_group); |
| 987 | if (gpiochip_remove(&dev->gc)) |
| 988 | hid_err(hdev, "unable to remove gpio chip\n"); |
| 989 | i2c_del_adapter(&dev->adap); |
| 990 | /* i2c_del_adapter has finished removing all i2c devices from our |
| 991 | * adapter. Well behaved devices should no longer call our cp2112_xfer |
| 992 | * and should have waited for any pending calls to finish. It has also |
| 993 | * waited for device_unregister(&adap->dev) to complete. Therefore we |
| 994 | * can safely free our struct cp2112_device. |
| 995 | */ |
| 996 | hid_hw_close(hdev); |
| 997 | hid_hw_stop(hdev); |
| 998 | kfree(dev); |
| 999 | } |
| 1000 | |
| 1001 | static int cp2112_raw_event(struct hid_device *hdev, struct hid_report *report, |
| 1002 | u8 *data, int size) |
| 1003 | { |
| 1004 | struct cp2112_device *dev = hid_get_drvdata(hdev); |
| 1005 | struct cp2112_xfer_status_report *xfer = (void *)data; |
| 1006 | |
| 1007 | switch (data[0]) { |
| 1008 | case CP2112_TRANSFER_STATUS_RESPONSE: |
| 1009 | hid_dbg(hdev, "xfer status: %02x %02x %04x %04x\n", |
| 1010 | xfer->status0, xfer->status1, |
| 1011 | be16_to_cpu(xfer->retries), be16_to_cpu(xfer->length)); |
| 1012 | |
| 1013 | switch (xfer->status0) { |
| 1014 | case STATUS0_IDLE: |
| 1015 | dev->xfer_status = -EAGAIN; |
| 1016 | break; |
| 1017 | case STATUS0_BUSY: |
| 1018 | dev->xfer_status = -EBUSY; |
| 1019 | break; |
| 1020 | case STATUS0_COMPLETE: |
| 1021 | dev->xfer_status = be16_to_cpu(xfer->length); |
| 1022 | break; |
| 1023 | case STATUS0_ERROR: |
| 1024 | switch (xfer->status1) { |
| 1025 | case STATUS1_TIMEOUT_NACK: |
| 1026 | case STATUS1_TIMEOUT_BUS: |
| 1027 | dev->xfer_status = -ETIMEDOUT; |
| 1028 | break; |
| 1029 | default: |
| 1030 | dev->xfer_status = -EIO; |
| 1031 | break; |
| 1032 | } |
| 1033 | break; |
| 1034 | default: |
| 1035 | dev->xfer_status = -EINVAL; |
| 1036 | break; |
| 1037 | } |
| 1038 | |
| 1039 | atomic_set(&dev->xfer_avail, 1); |
| 1040 | break; |
| 1041 | case CP2112_DATA_READ_RESPONSE: |
| 1042 | hid_dbg(hdev, "read response: %02x %02x\n", data[1], data[2]); |
| 1043 | |
| 1044 | dev->read_length = data[2]; |
| 1045 | if (dev->read_length > sizeof(dev->read_data)) |
| 1046 | dev->read_length = sizeof(dev->read_data); |
| 1047 | |
| 1048 | memcpy(dev->read_data, &data[3], dev->read_length); |
| 1049 | atomic_set(&dev->read_avail, 1); |
| 1050 | break; |
| 1051 | default: |
| 1052 | hid_err(hdev, "unknown report\n"); |
| 1053 | |
| 1054 | return 0; |
| 1055 | } |
| 1056 | |
| 1057 | wake_up_interruptible(&dev->wait); |
| 1058 | return 1; |
| 1059 | } |
| 1060 | |
| 1061 | static struct hid_driver cp2112_driver = { |
| 1062 | .name = "cp2112", |
| 1063 | .id_table = cp2112_devices, |
| 1064 | .probe = cp2112_probe, |
| 1065 | .remove = cp2112_remove, |
| 1066 | .raw_event = cp2112_raw_event, |
| 1067 | }; |
| 1068 | |
| 1069 | module_hid_driver(cp2112_driver); |
| 1070 | MODULE_DESCRIPTION("Silicon Labs HID USB to SMBus master bridge"); |
| 1071 | MODULE_AUTHOR("David Barksdale <dbarksdale@uplogix.com>"); |
| 1072 | MODULE_LICENSE("GPL"); |
| 1073 | |