Benjamin Tissoires | 4a200c3 | 2012-11-12 15:42:59 +0100 | [diff] [blame] | 1 | /* |
| 2 | * HID over I2C protocol implementation |
| 3 | * |
| 4 | * Copyright (c) 2012 Benjamin Tissoires <benjamin.tissoires@gmail.com> |
| 5 | * Copyright (c) 2012 Ecole Nationale de l'Aviation Civile, France |
| 6 | * Copyright (c) 2012 Red Hat, Inc |
| 7 | * |
| 8 | * This code is partly based on "USB HID support for Linux": |
| 9 | * |
| 10 | * Copyright (c) 1999 Andreas Gal |
| 11 | * Copyright (c) 2000-2005 Vojtech Pavlik <vojtech@suse.cz> |
| 12 | * Copyright (c) 2005 Michael Haboustak <mike-@cinci.rr.com> for Concept2, Inc |
| 13 | * Copyright (c) 2007-2008 Oliver Neukum |
| 14 | * Copyright (c) 2006-2010 Jiri Kosina |
| 15 | * |
| 16 | * This file is subject to the terms and conditions of the GNU General Public |
| 17 | * License. See the file COPYING in the main directory of this archive for |
| 18 | * more details. |
| 19 | */ |
| 20 | |
| 21 | #include <linux/module.h> |
| 22 | #include <linux/i2c.h> |
| 23 | #include <linux/interrupt.h> |
| 24 | #include <linux/input.h> |
| 25 | #include <linux/delay.h> |
| 26 | #include <linux/slab.h> |
| 27 | #include <linux/pm.h> |
| 28 | #include <linux/device.h> |
| 29 | #include <linux/wait.h> |
| 30 | #include <linux/err.h> |
| 31 | #include <linux/string.h> |
| 32 | #include <linux/list.h> |
| 33 | #include <linux/jiffies.h> |
| 34 | #include <linux/kernel.h> |
Benjamin Tissoires | 4a200c3 | 2012-11-12 15:42:59 +0100 | [diff] [blame] | 35 | #include <linux/hid.h> |
| 36 | |
| 37 | #include <linux/i2c/i2c-hid.h> |
| 38 | |
| 39 | /* flags */ |
| 40 | #define I2C_HID_STARTED (1 << 0) |
| 41 | #define I2C_HID_RESET_PENDING (1 << 1) |
| 42 | #define I2C_HID_READ_PENDING (1 << 2) |
| 43 | |
| 44 | #define I2C_HID_PWR_ON 0x00 |
| 45 | #define I2C_HID_PWR_SLEEP 0x01 |
| 46 | |
| 47 | /* debug option */ |
Benjamin Tissoires | ee8e880 | 2012-12-04 16:27:45 +0100 | [diff] [blame] | 48 | static bool debug; |
Benjamin Tissoires | 4a200c3 | 2012-11-12 15:42:59 +0100 | [diff] [blame] | 49 | module_param(debug, bool, 0444); |
| 50 | MODULE_PARM_DESC(debug, "print a lot of debug information"); |
| 51 | |
Benjamin Tissoires | fa73864 | 2012-12-04 16:27:46 +0100 | [diff] [blame] | 52 | #define i2c_hid_dbg(ihid, fmt, arg...) \ |
| 53 | do { \ |
| 54 | if (debug) \ |
| 55 | dev_printk(KERN_DEBUG, &(ihid)->client->dev, fmt, ##arg); \ |
| 56 | } while (0) |
Benjamin Tissoires | 4a200c3 | 2012-11-12 15:42:59 +0100 | [diff] [blame] | 57 | |
| 58 | struct i2c_hid_desc { |
| 59 | __le16 wHIDDescLength; |
| 60 | __le16 bcdVersion; |
| 61 | __le16 wReportDescLength; |
| 62 | __le16 wReportDescRegister; |
| 63 | __le16 wInputRegister; |
| 64 | __le16 wMaxInputLength; |
| 65 | __le16 wOutputRegister; |
| 66 | __le16 wMaxOutputLength; |
| 67 | __le16 wCommandRegister; |
| 68 | __le16 wDataRegister; |
| 69 | __le16 wVendorID; |
| 70 | __le16 wProductID; |
| 71 | __le16 wVersionID; |
Benjamin Tissoires | 27174cf | 2012-12-05 15:02:53 +0100 | [diff] [blame] | 72 | __le32 reserved; |
Benjamin Tissoires | 4a200c3 | 2012-11-12 15:42:59 +0100 | [diff] [blame] | 73 | } __packed; |
| 74 | |
| 75 | struct i2c_hid_cmd { |
| 76 | unsigned int registerIndex; |
| 77 | __u8 opcode; |
| 78 | unsigned int length; |
| 79 | bool wait; |
| 80 | }; |
| 81 | |
| 82 | union command { |
| 83 | u8 data[0]; |
| 84 | struct cmd { |
| 85 | __le16 reg; |
| 86 | __u8 reportTypeID; |
| 87 | __u8 opcode; |
| 88 | } __packed c; |
| 89 | }; |
| 90 | |
| 91 | #define I2C_HID_CMD(opcode_) \ |
| 92 | .opcode = opcode_, .length = 4, \ |
| 93 | .registerIndex = offsetof(struct i2c_hid_desc, wCommandRegister) |
| 94 | |
| 95 | /* fetch HID descriptor */ |
| 96 | static const struct i2c_hid_cmd hid_descr_cmd = { .length = 2 }; |
| 97 | /* fetch report descriptors */ |
| 98 | static const struct i2c_hid_cmd hid_report_descr_cmd = { |
| 99 | .registerIndex = offsetof(struct i2c_hid_desc, |
| 100 | wReportDescRegister), |
| 101 | .opcode = 0x00, |
| 102 | .length = 2 }; |
| 103 | /* commands */ |
| 104 | static const struct i2c_hid_cmd hid_reset_cmd = { I2C_HID_CMD(0x01), |
| 105 | .wait = true }; |
| 106 | static const struct i2c_hid_cmd hid_get_report_cmd = { I2C_HID_CMD(0x02) }; |
| 107 | static const struct i2c_hid_cmd hid_set_report_cmd = { I2C_HID_CMD(0x03) }; |
Benjamin Tissoires | 4a200c3 | 2012-11-12 15:42:59 +0100 | [diff] [blame] | 108 | static const struct i2c_hid_cmd hid_set_power_cmd = { I2C_HID_CMD(0x08) }; |
Benjamin Tissoires | 6bf6c8b | 2012-12-04 16:27:47 +0100 | [diff] [blame] | 109 | |
| 110 | /* |
| 111 | * These definitions are not used here, but are defined by the spec. |
| 112 | * Keeping them here for documentation purposes. |
| 113 | * |
| 114 | * static const struct i2c_hid_cmd hid_get_idle_cmd = { I2C_HID_CMD(0x04) }; |
| 115 | * static const struct i2c_hid_cmd hid_set_idle_cmd = { I2C_HID_CMD(0x05) }; |
| 116 | * static const struct i2c_hid_cmd hid_get_protocol_cmd = { I2C_HID_CMD(0x06) }; |
| 117 | * static const struct i2c_hid_cmd hid_set_protocol_cmd = { I2C_HID_CMD(0x07) }; |
| 118 | */ |
Benjamin Tissoires | 4a200c3 | 2012-11-12 15:42:59 +0100 | [diff] [blame] | 119 | |
| 120 | /* The main device structure */ |
| 121 | struct i2c_hid { |
| 122 | struct i2c_client *client; /* i2c client */ |
| 123 | struct hid_device *hid; /* pointer to corresponding HID dev */ |
| 124 | union { |
| 125 | __u8 hdesc_buffer[sizeof(struct i2c_hid_desc)]; |
| 126 | struct i2c_hid_desc hdesc; /* the HID Descriptor */ |
| 127 | }; |
| 128 | __le16 wHIDDescRegister; /* location of the i2c |
| 129 | * register of the HID |
| 130 | * descriptor. */ |
| 131 | unsigned int bufsize; /* i2c buffer size */ |
| 132 | char *inbuf; /* Input buffer */ |
| 133 | char *cmdbuf; /* Command buffer */ |
| 134 | char *argsbuf; /* Command arguments buffer */ |
| 135 | |
| 136 | unsigned long flags; /* device flags */ |
| 137 | |
| 138 | int irq; /* the interrupt line irq */ |
| 139 | |
| 140 | wait_queue_head_t wait; /* For waiting the interrupt */ |
| 141 | }; |
| 142 | |
| 143 | static int __i2c_hid_command(struct i2c_client *client, |
| 144 | const struct i2c_hid_cmd *command, u8 reportID, |
| 145 | u8 reportType, u8 *args, int args_len, |
| 146 | unsigned char *buf_recv, int data_len) |
| 147 | { |
| 148 | struct i2c_hid *ihid = i2c_get_clientdata(client); |
| 149 | union command *cmd = (union command *)ihid->cmdbuf; |
| 150 | int ret; |
| 151 | struct i2c_msg msg[2]; |
| 152 | int msg_num = 1; |
| 153 | |
| 154 | int length = command->length; |
| 155 | bool wait = command->wait; |
| 156 | unsigned int registerIndex = command->registerIndex; |
| 157 | |
| 158 | /* special case for hid_descr_cmd */ |
| 159 | if (command == &hid_descr_cmd) { |
| 160 | cmd->c.reg = ihid->wHIDDescRegister; |
| 161 | } else { |
| 162 | cmd->data[0] = ihid->hdesc_buffer[registerIndex]; |
| 163 | cmd->data[1] = ihid->hdesc_buffer[registerIndex + 1]; |
| 164 | } |
| 165 | |
| 166 | if (length > 2) { |
| 167 | cmd->c.opcode = command->opcode; |
| 168 | cmd->c.reportTypeID = reportID | reportType << 4; |
| 169 | } |
| 170 | |
| 171 | memcpy(cmd->data + length, args, args_len); |
| 172 | length += args_len; |
| 173 | |
| 174 | i2c_hid_dbg(ihid, "%s: cmd=%*ph\n", __func__, length, cmd->data); |
| 175 | |
| 176 | msg[0].addr = client->addr; |
| 177 | msg[0].flags = client->flags & I2C_M_TEN; |
| 178 | msg[0].len = length; |
| 179 | msg[0].buf = cmd->data; |
| 180 | if (data_len > 0) { |
| 181 | msg[1].addr = client->addr; |
| 182 | msg[1].flags = client->flags & I2C_M_TEN; |
| 183 | msg[1].flags |= I2C_M_RD; |
| 184 | msg[1].len = data_len; |
| 185 | msg[1].buf = buf_recv; |
| 186 | msg_num = 2; |
| 187 | set_bit(I2C_HID_READ_PENDING, &ihid->flags); |
| 188 | } |
| 189 | |
| 190 | if (wait) |
| 191 | set_bit(I2C_HID_RESET_PENDING, &ihid->flags); |
| 192 | |
| 193 | ret = i2c_transfer(client->adapter, msg, msg_num); |
| 194 | |
| 195 | if (data_len > 0) |
| 196 | clear_bit(I2C_HID_READ_PENDING, &ihid->flags); |
| 197 | |
| 198 | if (ret != msg_num) |
| 199 | return ret < 0 ? ret : -EIO; |
| 200 | |
| 201 | ret = 0; |
| 202 | |
| 203 | if (wait) { |
| 204 | i2c_hid_dbg(ihid, "%s: waiting...\n", __func__); |
| 205 | if (!wait_event_timeout(ihid->wait, |
| 206 | !test_bit(I2C_HID_RESET_PENDING, &ihid->flags), |
| 207 | msecs_to_jiffies(5000))) |
| 208 | ret = -ENODATA; |
| 209 | i2c_hid_dbg(ihid, "%s: finished.\n", __func__); |
| 210 | } |
| 211 | |
| 212 | return ret; |
| 213 | } |
| 214 | |
| 215 | static int i2c_hid_command(struct i2c_client *client, |
| 216 | const struct i2c_hid_cmd *command, |
| 217 | unsigned char *buf_recv, int data_len) |
| 218 | { |
| 219 | return __i2c_hid_command(client, command, 0, 0, NULL, 0, |
| 220 | buf_recv, data_len); |
| 221 | } |
| 222 | |
| 223 | static int i2c_hid_get_report(struct i2c_client *client, u8 reportType, |
| 224 | u8 reportID, unsigned char *buf_recv, int data_len) |
| 225 | { |
| 226 | struct i2c_hid *ihid = i2c_get_clientdata(client); |
| 227 | u8 args[3]; |
| 228 | int ret; |
| 229 | int args_len = 0; |
| 230 | u16 readRegister = le16_to_cpu(ihid->hdesc.wDataRegister); |
| 231 | |
| 232 | i2c_hid_dbg(ihid, "%s\n", __func__); |
| 233 | |
| 234 | if (reportID >= 0x0F) { |
| 235 | args[args_len++] = reportID; |
| 236 | reportID = 0x0F; |
| 237 | } |
| 238 | |
| 239 | args[args_len++] = readRegister & 0xFF; |
| 240 | args[args_len++] = readRegister >> 8; |
| 241 | |
| 242 | ret = __i2c_hid_command(client, &hid_get_report_cmd, reportID, |
| 243 | reportType, args, args_len, buf_recv, data_len); |
| 244 | if (ret) { |
| 245 | dev_err(&client->dev, |
| 246 | "failed to retrieve report from device.\n"); |
Benjamin Tissoires | 317b204 | 2012-12-04 16:27:48 +0100 | [diff] [blame] | 247 | return ret; |
Benjamin Tissoires | 4a200c3 | 2012-11-12 15:42:59 +0100 | [diff] [blame] | 248 | } |
| 249 | |
| 250 | return 0; |
| 251 | } |
| 252 | |
| 253 | static int i2c_hid_set_report(struct i2c_client *client, u8 reportType, |
| 254 | u8 reportID, unsigned char *buf, size_t data_len) |
| 255 | { |
| 256 | struct i2c_hid *ihid = i2c_get_clientdata(client); |
| 257 | u8 *args = ihid->argsbuf; |
| 258 | int ret; |
| 259 | u16 dataRegister = le16_to_cpu(ihid->hdesc.wDataRegister); |
| 260 | |
| 261 | /* hidraw already checked that data_len < HID_MAX_BUFFER_SIZE */ |
| 262 | u16 size = 2 /* size */ + |
| 263 | (reportID ? 1 : 0) /* reportID */ + |
| 264 | data_len /* buf */; |
| 265 | int args_len = (reportID >= 0x0F ? 1 : 0) /* optional third byte */ + |
| 266 | 2 /* dataRegister */ + |
| 267 | size /* args */; |
| 268 | int index = 0; |
| 269 | |
| 270 | i2c_hid_dbg(ihid, "%s\n", __func__); |
| 271 | |
| 272 | if (reportID >= 0x0F) { |
| 273 | args[index++] = reportID; |
| 274 | reportID = 0x0F; |
| 275 | } |
| 276 | |
| 277 | args[index++] = dataRegister & 0xFF; |
| 278 | args[index++] = dataRegister >> 8; |
| 279 | |
| 280 | args[index++] = size & 0xFF; |
| 281 | args[index++] = size >> 8; |
| 282 | |
| 283 | if (reportID) |
| 284 | args[index++] = reportID; |
| 285 | |
| 286 | memcpy(&args[index], buf, data_len); |
| 287 | |
| 288 | ret = __i2c_hid_command(client, &hid_set_report_cmd, reportID, |
| 289 | reportType, args, args_len, NULL, 0); |
| 290 | if (ret) { |
| 291 | dev_err(&client->dev, "failed to set a report to device.\n"); |
Benjamin Tissoires | 317b204 | 2012-12-04 16:27:48 +0100 | [diff] [blame] | 292 | return ret; |
Benjamin Tissoires | 4a200c3 | 2012-11-12 15:42:59 +0100 | [diff] [blame] | 293 | } |
| 294 | |
| 295 | return data_len; |
| 296 | } |
| 297 | |
| 298 | static int i2c_hid_set_power(struct i2c_client *client, int power_state) |
| 299 | { |
| 300 | struct i2c_hid *ihid = i2c_get_clientdata(client); |
| 301 | int ret; |
| 302 | |
| 303 | i2c_hid_dbg(ihid, "%s\n", __func__); |
| 304 | |
| 305 | ret = __i2c_hid_command(client, &hid_set_power_cmd, power_state, |
| 306 | 0, NULL, 0, NULL, 0); |
| 307 | if (ret) |
| 308 | dev_err(&client->dev, "failed to change power setting.\n"); |
| 309 | |
| 310 | return ret; |
| 311 | } |
| 312 | |
| 313 | static int i2c_hid_hwreset(struct i2c_client *client) |
| 314 | { |
| 315 | struct i2c_hid *ihid = i2c_get_clientdata(client); |
| 316 | int ret; |
| 317 | |
| 318 | i2c_hid_dbg(ihid, "%s\n", __func__); |
| 319 | |
| 320 | ret = i2c_hid_set_power(client, I2C_HID_PWR_ON); |
| 321 | if (ret) |
| 322 | return ret; |
| 323 | |
| 324 | i2c_hid_dbg(ihid, "resetting...\n"); |
| 325 | |
| 326 | ret = i2c_hid_command(client, &hid_reset_cmd, NULL, 0); |
| 327 | if (ret) { |
| 328 | dev_err(&client->dev, "failed to reset device.\n"); |
| 329 | i2c_hid_set_power(client, I2C_HID_PWR_SLEEP); |
| 330 | return ret; |
| 331 | } |
| 332 | |
| 333 | return 0; |
| 334 | } |
| 335 | |
Benjamin Tissoires | 317b204 | 2012-12-04 16:27:48 +0100 | [diff] [blame] | 336 | static void i2c_hid_get_input(struct i2c_hid *ihid) |
Benjamin Tissoires | 4a200c3 | 2012-11-12 15:42:59 +0100 | [diff] [blame] | 337 | { |
| 338 | int ret, ret_size; |
| 339 | int size = le16_to_cpu(ihid->hdesc.wMaxInputLength); |
| 340 | |
| 341 | ret = i2c_master_recv(ihid->client, ihid->inbuf, size); |
| 342 | if (ret != size) { |
| 343 | if (ret < 0) |
Benjamin Tissoires | 317b204 | 2012-12-04 16:27:48 +0100 | [diff] [blame] | 344 | return; |
Benjamin Tissoires | 4a200c3 | 2012-11-12 15:42:59 +0100 | [diff] [blame] | 345 | |
| 346 | dev_err(&ihid->client->dev, "%s: got %d data instead of %d\n", |
| 347 | __func__, ret, size); |
Benjamin Tissoires | 317b204 | 2012-12-04 16:27:48 +0100 | [diff] [blame] | 348 | return; |
Benjamin Tissoires | 4a200c3 | 2012-11-12 15:42:59 +0100 | [diff] [blame] | 349 | } |
| 350 | |
| 351 | ret_size = ihid->inbuf[0] | ihid->inbuf[1] << 8; |
| 352 | |
| 353 | if (!ret_size) { |
| 354 | /* host or device initiated RESET completed */ |
| 355 | if (test_and_clear_bit(I2C_HID_RESET_PENDING, &ihid->flags)) |
| 356 | wake_up(&ihid->wait); |
Benjamin Tissoires | 317b204 | 2012-12-04 16:27:48 +0100 | [diff] [blame] | 357 | return; |
Benjamin Tissoires | 4a200c3 | 2012-11-12 15:42:59 +0100 | [diff] [blame] | 358 | } |
| 359 | |
| 360 | if (ret_size > size) { |
| 361 | dev_err(&ihid->client->dev, "%s: incomplete report (%d/%d)\n", |
| 362 | __func__, size, ret_size); |
Benjamin Tissoires | 317b204 | 2012-12-04 16:27:48 +0100 | [diff] [blame] | 363 | return; |
Benjamin Tissoires | 4a200c3 | 2012-11-12 15:42:59 +0100 | [diff] [blame] | 364 | } |
| 365 | |
| 366 | i2c_hid_dbg(ihid, "input: %*ph\n", ret_size, ihid->inbuf); |
| 367 | |
| 368 | if (test_bit(I2C_HID_STARTED, &ihid->flags)) |
| 369 | hid_input_report(ihid->hid, HID_INPUT_REPORT, ihid->inbuf + 2, |
| 370 | ret_size - 2, 1); |
| 371 | |
Benjamin Tissoires | 317b204 | 2012-12-04 16:27:48 +0100 | [diff] [blame] | 372 | return; |
Benjamin Tissoires | 4a200c3 | 2012-11-12 15:42:59 +0100 | [diff] [blame] | 373 | } |
| 374 | |
| 375 | static irqreturn_t i2c_hid_irq(int irq, void *dev_id) |
| 376 | { |
| 377 | struct i2c_hid *ihid = dev_id; |
| 378 | |
| 379 | if (test_bit(I2C_HID_READ_PENDING, &ihid->flags)) |
| 380 | return IRQ_HANDLED; |
| 381 | |
| 382 | i2c_hid_get_input(ihid); |
| 383 | |
| 384 | return IRQ_HANDLED; |
| 385 | } |
| 386 | |
| 387 | static int i2c_hid_get_report_length(struct hid_report *report) |
| 388 | { |
| 389 | return ((report->size - 1) >> 3) + 1 + |
| 390 | report->device->report_enum[report->type].numbered + 2; |
| 391 | } |
| 392 | |
| 393 | static void i2c_hid_init_report(struct hid_report *report, u8 *buffer, |
| 394 | size_t bufsize) |
| 395 | { |
| 396 | struct hid_device *hid = report->device; |
| 397 | struct i2c_client *client = hid->driver_data; |
| 398 | struct i2c_hid *ihid = i2c_get_clientdata(client); |
| 399 | unsigned int size, ret_size; |
| 400 | |
| 401 | size = i2c_hid_get_report_length(report); |
Benjamin Tissoires | c737bcf | 2012-12-04 16:27:50 +0100 | [diff] [blame] | 402 | if (i2c_hid_get_report(client, |
Benjamin Tissoires | 4a200c3 | 2012-11-12 15:42:59 +0100 | [diff] [blame] | 403 | report->type == HID_FEATURE_REPORT ? 0x03 : 0x01, |
Benjamin Tissoires | c737bcf | 2012-12-04 16:27:50 +0100 | [diff] [blame] | 404 | report->id, buffer, size)) |
| 405 | return; |
Benjamin Tissoires | 4a200c3 | 2012-11-12 15:42:59 +0100 | [diff] [blame] | 406 | |
| 407 | i2c_hid_dbg(ihid, "report (len=%d): %*ph\n", size, size, ihid->inbuf); |
| 408 | |
| 409 | ret_size = buffer[0] | (buffer[1] << 8); |
| 410 | |
| 411 | if (ret_size != size) { |
| 412 | dev_err(&client->dev, "error in %s size:%d / ret_size:%d\n", |
| 413 | __func__, size, ret_size); |
| 414 | return; |
| 415 | } |
| 416 | |
| 417 | /* hid->driver_lock is held as we are in probe function, |
| 418 | * we just need to setup the input fields, so using |
| 419 | * hid_report_raw_event is safe. */ |
| 420 | hid_report_raw_event(hid, report->type, buffer + 2, size - 2, 1); |
| 421 | } |
| 422 | |
| 423 | /* |
| 424 | * Initialize all reports |
| 425 | */ |
| 426 | static void i2c_hid_init_reports(struct hid_device *hid) |
| 427 | { |
| 428 | struct hid_report *report; |
| 429 | struct i2c_client *client = hid->driver_data; |
| 430 | struct i2c_hid *ihid = i2c_get_clientdata(client); |
| 431 | u8 *inbuf = kzalloc(ihid->bufsize, GFP_KERNEL); |
| 432 | |
Benjamin Tissoires | 317b204 | 2012-12-04 16:27:48 +0100 | [diff] [blame] | 433 | if (!inbuf) { |
| 434 | dev_err(&client->dev, "can not retrieve initial reports\n"); |
Benjamin Tissoires | 4a200c3 | 2012-11-12 15:42:59 +0100 | [diff] [blame] | 435 | return; |
Benjamin Tissoires | 317b204 | 2012-12-04 16:27:48 +0100 | [diff] [blame] | 436 | } |
Benjamin Tissoires | 4a200c3 | 2012-11-12 15:42:59 +0100 | [diff] [blame] | 437 | |
| 438 | list_for_each_entry(report, |
| 439 | &hid->report_enum[HID_INPUT_REPORT].report_list, list) |
| 440 | i2c_hid_init_report(report, inbuf, ihid->bufsize); |
| 441 | |
| 442 | list_for_each_entry(report, |
| 443 | &hid->report_enum[HID_FEATURE_REPORT].report_list, list) |
| 444 | i2c_hid_init_report(report, inbuf, ihid->bufsize); |
| 445 | |
| 446 | kfree(inbuf); |
| 447 | } |
| 448 | |
| 449 | /* |
| 450 | * Traverse the supplied list of reports and find the longest |
| 451 | */ |
| 452 | static void i2c_hid_find_max_report(struct hid_device *hid, unsigned int type, |
| 453 | unsigned int *max) |
| 454 | { |
| 455 | struct hid_report *report; |
| 456 | unsigned int size; |
| 457 | |
| 458 | /* We should not rely on wMaxInputLength, as some devices may set it to |
| 459 | * a wrong length. */ |
| 460 | list_for_each_entry(report, &hid->report_enum[type].report_list, list) { |
| 461 | size = i2c_hid_get_report_length(report); |
| 462 | if (*max < size) |
| 463 | *max = size; |
| 464 | } |
| 465 | } |
| 466 | |
Benjamin Tissoires | 4a200c3 | 2012-11-12 15:42:59 +0100 | [diff] [blame] | 467 | static void i2c_hid_free_buffers(struct i2c_hid *ihid) |
| 468 | { |
| 469 | kfree(ihid->inbuf); |
| 470 | kfree(ihid->argsbuf); |
| 471 | kfree(ihid->cmdbuf); |
| 472 | ihid->inbuf = NULL; |
| 473 | ihid->cmdbuf = NULL; |
| 474 | ihid->argsbuf = NULL; |
Benjamin Tissoires | 29b4578 | 2012-12-05 15:02:54 +0100 | [diff] [blame^] | 475 | ihid->bufsize = 0; |
| 476 | } |
| 477 | |
| 478 | static int i2c_hid_alloc_buffers(struct i2c_hid *ihid, size_t report_size) |
| 479 | { |
| 480 | /* the worst case is computed from the set_report command with a |
| 481 | * reportID > 15 and the maximum report length */ |
| 482 | int args_len = sizeof(__u8) + /* optional ReportID byte */ |
| 483 | sizeof(__u16) + /* data register */ |
| 484 | sizeof(__u16) + /* size of the report */ |
| 485 | report_size; /* report */ |
| 486 | |
| 487 | ihid->inbuf = kzalloc(report_size, GFP_KERNEL); |
| 488 | ihid->argsbuf = kzalloc(args_len, GFP_KERNEL); |
| 489 | ihid->cmdbuf = kzalloc(sizeof(union command) + args_len, GFP_KERNEL); |
| 490 | |
| 491 | if (!ihid->inbuf || !ihid->argsbuf || !ihid->cmdbuf) { |
| 492 | i2c_hid_free_buffers(ihid); |
| 493 | return -ENOMEM; |
| 494 | } |
| 495 | |
| 496 | ihid->bufsize = report_size; |
| 497 | |
| 498 | return 0; |
Benjamin Tissoires | 4a200c3 | 2012-11-12 15:42:59 +0100 | [diff] [blame] | 499 | } |
| 500 | |
| 501 | static int i2c_hid_get_raw_report(struct hid_device *hid, |
| 502 | unsigned char report_number, __u8 *buf, size_t count, |
| 503 | unsigned char report_type) |
| 504 | { |
| 505 | struct i2c_client *client = hid->driver_data; |
| 506 | struct i2c_hid *ihid = i2c_get_clientdata(client); |
| 507 | int ret; |
| 508 | |
| 509 | if (report_type == HID_OUTPUT_REPORT) |
| 510 | return -EINVAL; |
| 511 | |
| 512 | if (count > ihid->bufsize) |
| 513 | count = ihid->bufsize; |
| 514 | |
| 515 | ret = i2c_hid_get_report(client, |
| 516 | report_type == HID_FEATURE_REPORT ? 0x03 : 0x01, |
| 517 | report_number, ihid->inbuf, count); |
| 518 | |
| 519 | if (ret < 0) |
| 520 | return ret; |
| 521 | |
| 522 | count = ihid->inbuf[0] | (ihid->inbuf[1] << 8); |
| 523 | |
| 524 | memcpy(buf, ihid->inbuf + 2, count); |
| 525 | |
| 526 | return count; |
| 527 | } |
| 528 | |
| 529 | static int i2c_hid_output_raw_report(struct hid_device *hid, __u8 *buf, |
| 530 | size_t count, unsigned char report_type) |
| 531 | { |
| 532 | struct i2c_client *client = hid->driver_data; |
| 533 | int report_id = buf[0]; |
| 534 | |
| 535 | if (report_type == HID_INPUT_REPORT) |
| 536 | return -EINVAL; |
| 537 | |
| 538 | return i2c_hid_set_report(client, |
| 539 | report_type == HID_FEATURE_REPORT ? 0x03 : 0x02, |
| 540 | report_id, buf, count); |
| 541 | } |
| 542 | |
| 543 | static int i2c_hid_parse(struct hid_device *hid) |
| 544 | { |
| 545 | struct i2c_client *client = hid->driver_data; |
| 546 | struct i2c_hid *ihid = i2c_get_clientdata(client); |
| 547 | struct i2c_hid_desc *hdesc = &ihid->hdesc; |
| 548 | unsigned int rsize; |
| 549 | char *rdesc; |
| 550 | int ret; |
| 551 | int tries = 3; |
| 552 | |
| 553 | i2c_hid_dbg(ihid, "entering %s\n", __func__); |
| 554 | |
| 555 | rsize = le16_to_cpu(hdesc->wReportDescLength); |
| 556 | if (!rsize || rsize > HID_MAX_DESCRIPTOR_SIZE) { |
| 557 | dbg_hid("weird size of report descriptor (%u)\n", rsize); |
| 558 | return -EINVAL; |
| 559 | } |
| 560 | |
| 561 | do { |
| 562 | ret = i2c_hid_hwreset(client); |
| 563 | if (ret) |
| 564 | msleep(1000); |
| 565 | } while (tries-- > 0 && ret); |
| 566 | |
| 567 | if (ret) |
| 568 | return ret; |
| 569 | |
| 570 | rdesc = kzalloc(rsize, GFP_KERNEL); |
| 571 | |
| 572 | if (!rdesc) { |
| 573 | dbg_hid("couldn't allocate rdesc memory\n"); |
| 574 | return -ENOMEM; |
| 575 | } |
| 576 | |
| 577 | i2c_hid_dbg(ihid, "asking HID report descriptor\n"); |
| 578 | |
| 579 | ret = i2c_hid_command(client, &hid_report_descr_cmd, rdesc, rsize); |
| 580 | if (ret) { |
| 581 | hid_err(hid, "reading report descriptor failed\n"); |
| 582 | kfree(rdesc); |
| 583 | return -EIO; |
| 584 | } |
| 585 | |
| 586 | i2c_hid_dbg(ihid, "Report Descriptor: %*ph\n", rsize, rdesc); |
| 587 | |
| 588 | ret = hid_parse_report(hid, rdesc, rsize); |
| 589 | kfree(rdesc); |
| 590 | if (ret) { |
| 591 | dbg_hid("parsing report descriptor failed\n"); |
| 592 | return ret; |
| 593 | } |
| 594 | |
| 595 | return 0; |
| 596 | } |
| 597 | |
| 598 | static int i2c_hid_start(struct hid_device *hid) |
| 599 | { |
| 600 | struct i2c_client *client = hid->driver_data; |
| 601 | struct i2c_hid *ihid = i2c_get_clientdata(client); |
| 602 | int ret; |
Benjamin Tissoires | 29b4578 | 2012-12-05 15:02:54 +0100 | [diff] [blame^] | 603 | unsigned int bufsize = HID_MIN_BUFFER_SIZE; |
Benjamin Tissoires | 4a200c3 | 2012-11-12 15:42:59 +0100 | [diff] [blame] | 604 | |
Benjamin Tissoires | 29b4578 | 2012-12-05 15:02:54 +0100 | [diff] [blame^] | 605 | i2c_hid_find_max_report(hid, HID_INPUT_REPORT, &bufsize); |
| 606 | i2c_hid_find_max_report(hid, HID_OUTPUT_REPORT, &bufsize); |
| 607 | i2c_hid_find_max_report(hid, HID_FEATURE_REPORT, &bufsize); |
Benjamin Tissoires | 4a200c3 | 2012-11-12 15:42:59 +0100 | [diff] [blame] | 608 | |
Benjamin Tissoires | 29b4578 | 2012-12-05 15:02:54 +0100 | [diff] [blame^] | 609 | if (bufsize > ihid->bufsize) { |
Benjamin Tissoires | 4a200c3 | 2012-11-12 15:42:59 +0100 | [diff] [blame] | 610 | i2c_hid_free_buffers(ihid); |
| 611 | |
Benjamin Tissoires | 29b4578 | 2012-12-05 15:02:54 +0100 | [diff] [blame^] | 612 | ret = i2c_hid_alloc_buffers(ihid, bufsize); |
Benjamin Tissoires | 4a200c3 | 2012-11-12 15:42:59 +0100 | [diff] [blame] | 613 | |
Benjamin Tissoires | 29b4578 | 2012-12-05 15:02:54 +0100 | [diff] [blame^] | 614 | if (ret) |
Benjamin Tissoires | 4a200c3 | 2012-11-12 15:42:59 +0100 | [diff] [blame] | 615 | return ret; |
Benjamin Tissoires | 4a200c3 | 2012-11-12 15:42:59 +0100 | [diff] [blame] | 616 | } |
| 617 | |
| 618 | if (!(hid->quirks & HID_QUIRK_NO_INIT_REPORTS)) |
| 619 | i2c_hid_init_reports(hid); |
| 620 | |
| 621 | return 0; |
| 622 | } |
| 623 | |
| 624 | static void i2c_hid_stop(struct hid_device *hid) |
| 625 | { |
| 626 | struct i2c_client *client = hid->driver_data; |
| 627 | struct i2c_hid *ihid = i2c_get_clientdata(client); |
| 628 | |
| 629 | hid->claimed = 0; |
| 630 | |
| 631 | i2c_hid_free_buffers(ihid); |
| 632 | } |
| 633 | |
| 634 | static int i2c_hid_open(struct hid_device *hid) |
| 635 | { |
| 636 | struct i2c_client *client = hid->driver_data; |
| 637 | struct i2c_hid *ihid = i2c_get_clientdata(client); |
| 638 | int ret; |
| 639 | |
| 640 | if (!hid->open++) { |
| 641 | ret = i2c_hid_set_power(client, I2C_HID_PWR_ON); |
| 642 | if (ret) { |
| 643 | hid->open--; |
| 644 | return -EIO; |
| 645 | } |
| 646 | set_bit(I2C_HID_STARTED, &ihid->flags); |
| 647 | } |
| 648 | return 0; |
| 649 | } |
| 650 | |
| 651 | static void i2c_hid_close(struct hid_device *hid) |
| 652 | { |
| 653 | struct i2c_client *client = hid->driver_data; |
| 654 | struct i2c_hid *ihid = i2c_get_clientdata(client); |
| 655 | |
| 656 | /* protecting hid->open to make sure we don't restart |
| 657 | * data acquistion due to a resumption we no longer |
| 658 | * care about |
| 659 | */ |
| 660 | if (!--hid->open) { |
| 661 | clear_bit(I2C_HID_STARTED, &ihid->flags); |
| 662 | |
| 663 | /* Save some power */ |
| 664 | i2c_hid_set_power(client, I2C_HID_PWR_SLEEP); |
| 665 | } |
| 666 | } |
| 667 | |
| 668 | static int i2c_hid_power(struct hid_device *hid, int lvl) |
| 669 | { |
| 670 | struct i2c_client *client = hid->driver_data; |
| 671 | struct i2c_hid *ihid = i2c_get_clientdata(client); |
| 672 | int ret = 0; |
| 673 | |
| 674 | i2c_hid_dbg(ihid, "%s lvl:%d\n", __func__, lvl); |
| 675 | |
| 676 | switch (lvl) { |
| 677 | case PM_HINT_FULLON: |
| 678 | ret = i2c_hid_set_power(client, I2C_HID_PWR_ON); |
| 679 | break; |
| 680 | case PM_HINT_NORMAL: |
| 681 | ret = i2c_hid_set_power(client, I2C_HID_PWR_SLEEP); |
| 682 | break; |
| 683 | } |
| 684 | return ret; |
| 685 | } |
| 686 | |
| 687 | static int i2c_hid_hidinput_input_event(struct input_dev *dev, |
| 688 | unsigned int type, unsigned int code, int value) |
| 689 | { |
| 690 | struct hid_device *hid = input_get_drvdata(dev); |
| 691 | struct hid_field *field; |
| 692 | int offset; |
| 693 | |
| 694 | if (type == EV_FF) |
| 695 | return input_ff_event(dev, type, code, value); |
| 696 | |
| 697 | if (type != EV_LED) |
| 698 | return -1; |
| 699 | |
| 700 | offset = hidinput_find_field(hid, type, code, &field); |
| 701 | |
| 702 | if (offset == -1) { |
| 703 | hid_warn(dev, "event field not found\n"); |
| 704 | return -1; |
| 705 | } |
| 706 | |
Benjamin Tissoires | 317b204 | 2012-12-04 16:27:48 +0100 | [diff] [blame] | 707 | return hid_set_field(field, offset, value); |
Benjamin Tissoires | 4a200c3 | 2012-11-12 15:42:59 +0100 | [diff] [blame] | 708 | } |
| 709 | |
| 710 | static struct hid_ll_driver i2c_hid_ll_driver = { |
| 711 | .parse = i2c_hid_parse, |
| 712 | .start = i2c_hid_start, |
| 713 | .stop = i2c_hid_stop, |
| 714 | .open = i2c_hid_open, |
| 715 | .close = i2c_hid_close, |
| 716 | .power = i2c_hid_power, |
| 717 | .hidinput_input_event = i2c_hid_hidinput_input_event, |
| 718 | }; |
| 719 | |
| 720 | static int __devinit i2c_hid_init_irq(struct i2c_client *client) |
| 721 | { |
| 722 | struct i2c_hid *ihid = i2c_get_clientdata(client); |
| 723 | int ret; |
| 724 | |
| 725 | dev_dbg(&client->dev, "Requesting IRQ: %d\n", client->irq); |
| 726 | |
| 727 | ret = request_threaded_irq(client->irq, NULL, i2c_hid_irq, |
| 728 | IRQF_TRIGGER_FALLING | IRQF_ONESHOT, |
| 729 | client->name, ihid); |
| 730 | if (ret < 0) { |
Benjamin Tissoires | 9972dcc | 2012-12-04 16:27:49 +0100 | [diff] [blame] | 731 | dev_warn(&client->dev, |
Benjamin Tissoires | 4a200c3 | 2012-11-12 15:42:59 +0100 | [diff] [blame] | 732 | "Could not register for %s interrupt, irq = %d," |
| 733 | " ret = %d\n", |
Benjamin Tissoires | 9972dcc | 2012-12-04 16:27:49 +0100 | [diff] [blame] | 734 | client->name, client->irq, ret); |
Benjamin Tissoires | 4a200c3 | 2012-11-12 15:42:59 +0100 | [diff] [blame] | 735 | |
| 736 | return ret; |
| 737 | } |
| 738 | |
| 739 | ihid->irq = client->irq; |
| 740 | |
| 741 | return 0; |
| 742 | } |
| 743 | |
| 744 | static int __devinit i2c_hid_fetch_hid_descriptor(struct i2c_hid *ihid) |
| 745 | { |
| 746 | struct i2c_client *client = ihid->client; |
| 747 | struct i2c_hid_desc *hdesc = &ihid->hdesc; |
| 748 | unsigned int dsize; |
| 749 | int ret; |
| 750 | |
| 751 | /* Fetch the length of HID description, retrieve the 4 first bytes: |
| 752 | * bytes 0-1 -> length |
| 753 | * bytes 2-3 -> bcdVersion (has to be 1.00) */ |
| 754 | ret = i2c_hid_command(client, &hid_descr_cmd, ihid->hdesc_buffer, 4); |
| 755 | |
| 756 | i2c_hid_dbg(ihid, "%s, ihid->hdesc_buffer: %*ph\n", |
| 757 | __func__, 4, ihid->hdesc_buffer); |
| 758 | |
| 759 | if (ret) { |
Benjamin Tissoires | 9972dcc | 2012-12-04 16:27:49 +0100 | [diff] [blame] | 760 | dev_err(&client->dev, |
| 761 | "unable to fetch the size of HID descriptor (ret=%d)\n", |
Benjamin Tissoires | 4a200c3 | 2012-11-12 15:42:59 +0100 | [diff] [blame] | 762 | ret); |
| 763 | return -ENODEV; |
| 764 | } |
| 765 | |
| 766 | dsize = le16_to_cpu(hdesc->wHIDDescLength); |
Benjamin Tissoires | 27174cf | 2012-12-05 15:02:53 +0100 | [diff] [blame] | 767 | /* |
| 768 | * the size of the HID descriptor should at least contain |
| 769 | * its size and the bcdVersion (4 bytes), and should not be greater |
| 770 | * than sizeof(struct i2c_hid_desc) as we directly fill this struct |
| 771 | * through i2c_hid_command. |
| 772 | */ |
| 773 | if (dsize < 4 || dsize > sizeof(struct i2c_hid_desc)) { |
Benjamin Tissoires | 4a200c3 | 2012-11-12 15:42:59 +0100 | [diff] [blame] | 774 | dev_err(&client->dev, "weird size of HID descriptor (%u)\n", |
| 775 | dsize); |
| 776 | return -ENODEV; |
| 777 | } |
| 778 | |
| 779 | /* check bcdVersion == 1.0 */ |
| 780 | if (le16_to_cpu(hdesc->bcdVersion) != 0x0100) { |
| 781 | dev_err(&client->dev, |
Benjamin Tissoires | 9972dcc | 2012-12-04 16:27:49 +0100 | [diff] [blame] | 782 | "unexpected HID descriptor bcdVersion (0x%04hx)\n", |
Benjamin Tissoires | 4a200c3 | 2012-11-12 15:42:59 +0100 | [diff] [blame] | 783 | le16_to_cpu(hdesc->bcdVersion)); |
| 784 | return -ENODEV; |
| 785 | } |
| 786 | |
| 787 | i2c_hid_dbg(ihid, "Fetching the HID descriptor\n"); |
| 788 | |
| 789 | ret = i2c_hid_command(client, &hid_descr_cmd, ihid->hdesc_buffer, |
| 790 | dsize); |
| 791 | if (ret) { |
| 792 | dev_err(&client->dev, "hid_descr_cmd Fail\n"); |
| 793 | return -ENODEV; |
| 794 | } |
| 795 | |
| 796 | i2c_hid_dbg(ihid, "HID Descriptor: %*ph\n", dsize, ihid->hdesc_buffer); |
| 797 | |
| 798 | return 0; |
| 799 | } |
| 800 | |
| 801 | static int __devinit i2c_hid_probe(struct i2c_client *client, |
| 802 | const struct i2c_device_id *dev_id) |
| 803 | { |
| 804 | int ret; |
| 805 | struct i2c_hid *ihid; |
| 806 | struct hid_device *hid; |
| 807 | __u16 hidRegister; |
| 808 | struct i2c_hid_platform_data *platform_data = client->dev.platform_data; |
| 809 | |
| 810 | dbg_hid("HID probe called for i2c 0x%02x\n", client->addr); |
| 811 | |
| 812 | if (!platform_data) { |
| 813 | dev_err(&client->dev, "HID register address not provided\n"); |
| 814 | return -EINVAL; |
| 815 | } |
| 816 | |
| 817 | if (!client->irq) { |
| 818 | dev_err(&client->dev, |
| 819 | "HID over i2c has not been provided an Int IRQ\n"); |
| 820 | return -EINVAL; |
| 821 | } |
| 822 | |
| 823 | ihid = kzalloc(sizeof(struct i2c_hid), GFP_KERNEL); |
| 824 | if (!ihid) |
| 825 | return -ENOMEM; |
| 826 | |
| 827 | i2c_set_clientdata(client, ihid); |
| 828 | |
| 829 | ihid->client = client; |
| 830 | |
| 831 | hidRegister = platform_data->hid_descriptor_address; |
| 832 | ihid->wHIDDescRegister = cpu_to_le16(hidRegister); |
| 833 | |
| 834 | init_waitqueue_head(&ihid->wait); |
| 835 | |
| 836 | /* we need to allocate the command buffer without knowing the maximum |
| 837 | * size of the reports. Let's use HID_MIN_BUFFER_SIZE, then we do the |
| 838 | * real computation later. */ |
Benjamin Tissoires | 29b4578 | 2012-12-05 15:02:54 +0100 | [diff] [blame^] | 839 | ret = i2c_hid_alloc_buffers(ihid, HID_MIN_BUFFER_SIZE); |
| 840 | if (ret < 0) |
| 841 | goto err; |
Benjamin Tissoires | 4a200c3 | 2012-11-12 15:42:59 +0100 | [diff] [blame] | 842 | |
| 843 | ret = i2c_hid_fetch_hid_descriptor(ihid); |
| 844 | if (ret < 0) |
| 845 | goto err; |
| 846 | |
| 847 | ret = i2c_hid_init_irq(client); |
| 848 | if (ret < 0) |
| 849 | goto err; |
| 850 | |
| 851 | hid = hid_allocate_device(); |
| 852 | if (IS_ERR(hid)) { |
| 853 | ret = PTR_ERR(hid); |
| 854 | goto err; |
| 855 | } |
| 856 | |
| 857 | ihid->hid = hid; |
| 858 | |
| 859 | hid->driver_data = client; |
| 860 | hid->ll_driver = &i2c_hid_ll_driver; |
| 861 | hid->hid_get_raw_report = i2c_hid_get_raw_report; |
| 862 | hid->hid_output_raw_report = i2c_hid_output_raw_report; |
| 863 | hid->dev.parent = &client->dev; |
| 864 | hid->bus = BUS_I2C; |
| 865 | hid->version = le16_to_cpu(ihid->hdesc.bcdVersion); |
| 866 | hid->vendor = le16_to_cpu(ihid->hdesc.wVendorID); |
| 867 | hid->product = le16_to_cpu(ihid->hdesc.wProductID); |
| 868 | |
Benjamin Tissoires | 9972dcc | 2012-12-04 16:27:49 +0100 | [diff] [blame] | 869 | snprintf(hid->name, sizeof(hid->name), "%s %04hX:%04hX", |
Benjamin Tissoires | 4a200c3 | 2012-11-12 15:42:59 +0100 | [diff] [blame] | 870 | client->name, hid->vendor, hid->product); |
| 871 | |
| 872 | ret = hid_add_device(hid); |
| 873 | if (ret) { |
| 874 | if (ret != -ENODEV) |
| 875 | hid_err(client, "can't add hid device: %d\n", ret); |
| 876 | goto err_mem_free; |
| 877 | } |
| 878 | |
| 879 | return 0; |
| 880 | |
| 881 | err_mem_free: |
| 882 | hid_destroy_device(hid); |
| 883 | |
| 884 | err: |
| 885 | if (ihid->irq) |
| 886 | free_irq(ihid->irq, ihid); |
| 887 | |
Jiri Kosina | 3c62602 | 2012-11-20 17:09:40 +0100 | [diff] [blame] | 888 | i2c_hid_free_buffers(ihid); |
Benjamin Tissoires | 4a200c3 | 2012-11-12 15:42:59 +0100 | [diff] [blame] | 889 | kfree(ihid); |
| 890 | return ret; |
| 891 | } |
| 892 | |
| 893 | static int __devexit i2c_hid_remove(struct i2c_client *client) |
| 894 | { |
| 895 | struct i2c_hid *ihid = i2c_get_clientdata(client); |
| 896 | struct hid_device *hid; |
| 897 | |
Benjamin Tissoires | 4a200c3 | 2012-11-12 15:42:59 +0100 | [diff] [blame] | 898 | hid = ihid->hid; |
| 899 | hid_destroy_device(hid); |
| 900 | |
| 901 | free_irq(client->irq, ihid); |
| 902 | |
Benjamin Tissoires | 134ebfd | 2012-12-04 16:27:54 +0100 | [diff] [blame] | 903 | if (ihid->bufsize) |
| 904 | i2c_hid_free_buffers(ihid); |
| 905 | |
Benjamin Tissoires | 4a200c3 | 2012-11-12 15:42:59 +0100 | [diff] [blame] | 906 | kfree(ihid); |
| 907 | |
| 908 | return 0; |
| 909 | } |
| 910 | |
| 911 | #ifdef CONFIG_PM_SLEEP |
| 912 | static int i2c_hid_suspend(struct device *dev) |
| 913 | { |
| 914 | struct i2c_client *client = to_i2c_client(dev); |
| 915 | struct i2c_hid *ihid = i2c_get_clientdata(client); |
| 916 | |
| 917 | if (device_may_wakeup(&client->dev)) |
| 918 | enable_irq_wake(ihid->irq); |
| 919 | |
| 920 | /* Save some power */ |
| 921 | i2c_hid_set_power(client, I2C_HID_PWR_SLEEP); |
| 922 | |
| 923 | return 0; |
| 924 | } |
| 925 | |
| 926 | static int i2c_hid_resume(struct device *dev) |
| 927 | { |
| 928 | int ret; |
| 929 | struct i2c_client *client = to_i2c_client(dev); |
| 930 | |
| 931 | ret = i2c_hid_hwreset(client); |
| 932 | if (ret) |
| 933 | return ret; |
| 934 | |
| 935 | if (device_may_wakeup(&client->dev)) |
| 936 | disable_irq_wake(client->irq); |
| 937 | |
| 938 | return 0; |
| 939 | } |
| 940 | #endif |
| 941 | |
| 942 | static SIMPLE_DEV_PM_OPS(i2c_hid_pm, i2c_hid_suspend, i2c_hid_resume); |
| 943 | |
| 944 | static const struct i2c_device_id i2c_hid_id_table[] = { |
Benjamin Tissoires | 24ebb37 | 2012-12-04 16:27:42 +0100 | [diff] [blame] | 945 | { "hid", 0 }, |
Benjamin Tissoires | 4a200c3 | 2012-11-12 15:42:59 +0100 | [diff] [blame] | 946 | { }, |
| 947 | }; |
| 948 | MODULE_DEVICE_TABLE(i2c, i2c_hid_id_table); |
| 949 | |
| 950 | |
| 951 | static struct i2c_driver i2c_hid_driver = { |
| 952 | .driver = { |
| 953 | .name = "i2c_hid", |
| 954 | .owner = THIS_MODULE, |
| 955 | .pm = &i2c_hid_pm, |
| 956 | }, |
| 957 | |
| 958 | .probe = i2c_hid_probe, |
| 959 | .remove = __devexit_p(i2c_hid_remove), |
| 960 | |
| 961 | .id_table = i2c_hid_id_table, |
| 962 | }; |
| 963 | |
| 964 | module_i2c_driver(i2c_hid_driver); |
| 965 | |
| 966 | MODULE_DESCRIPTION("HID over I2C core driver"); |
| 967 | MODULE_AUTHOR("Benjamin Tissoires <benjamin.tissoires@gmail.com>"); |
| 968 | MODULE_LICENSE("GPL"); |