1 /* 2 * Copyright (c) 2003-2015 Broadcom Corporation 3 * 4 * This file is licensed under the terms of the GNU General Public 5 * License version 2. This program is licensed "as is" without any 6 * warranty of any kind, whether express or implied. 7 */ 8 9 #include <linux/acpi.h> 10 #include <linux/clk.h> 11 #include <linux/completion.h> 12 #include <linux/i2c.h> 13 #include <linux/i2c-smbus.h> 14 #include <linux/init.h> 15 #include <linux/interrupt.h> 16 #include <linux/io.h> 17 #include <linux/kernel.h> 18 #include <linux/module.h> 19 #include <linux/platform_device.h> 20 #include <linux/delay.h> 21 22 #define XLP9XX_I2C_DIV 0x0 23 #define XLP9XX_I2C_CTRL 0x1 24 #define XLP9XX_I2C_CMD 0x2 25 #define XLP9XX_I2C_STATUS 0x3 26 #define XLP9XX_I2C_MTXFIFO 0x4 27 #define XLP9XX_I2C_MRXFIFO 0x5 28 #define XLP9XX_I2C_MFIFOCTRL 0x6 29 #define XLP9XX_I2C_STXFIFO 0x7 30 #define XLP9XX_I2C_SRXFIFO 0x8 31 #define XLP9XX_I2C_SFIFOCTRL 0x9 32 #define XLP9XX_I2C_SLAVEADDR 0xA 33 #define XLP9XX_I2C_OWNADDR 0xB 34 #define XLP9XX_I2C_FIFOWCNT 0xC 35 #define XLP9XX_I2C_INTEN 0xD 36 #define XLP9XX_I2C_INTST 0xE 37 #define XLP9XX_I2C_WAITCNT 0xF 38 #define XLP9XX_I2C_TIMEOUT 0X10 39 #define XLP9XX_I2C_GENCALLADDR 0x11 40 41 #define XLP9XX_I2C_STATUS_BUSY BIT(0) 42 43 #define XLP9XX_I2C_CMD_START BIT(7) 44 #define XLP9XX_I2C_CMD_STOP BIT(6) 45 #define XLP9XX_I2C_CMD_READ BIT(5) 46 #define XLP9XX_I2C_CMD_WRITE BIT(4) 47 #define XLP9XX_I2C_CMD_ACK BIT(3) 48 49 #define XLP9XX_I2C_CTRL_MCTLEN_SHIFT 16 50 #define XLP9XX_I2C_CTRL_MCTLEN_MASK 0xffff0000 51 #define XLP9XX_I2C_CTRL_RST BIT(8) 52 #define XLP9XX_I2C_CTRL_EN BIT(6) 53 #define XLP9XX_I2C_CTRL_MASTER BIT(4) 54 #define XLP9XX_I2C_CTRL_FIFORD BIT(1) 55 #define XLP9XX_I2C_CTRL_ADDMODE BIT(0) 56 57 #define XLP9XX_I2C_INTEN_NACKADDR BIT(25) 58 #define XLP9XX_I2C_INTEN_SADDR BIT(13) 59 #define XLP9XX_I2C_INTEN_DATADONE BIT(12) 60 #define XLP9XX_I2C_INTEN_ARLOST BIT(11) 61 #define XLP9XX_I2C_INTEN_MFIFOFULL BIT(4) 62 #define XLP9XX_I2C_INTEN_MFIFOEMTY BIT(3) 63 #define XLP9XX_I2C_INTEN_MFIFOHI BIT(2) 64 #define XLP9XX_I2C_INTEN_BUSERR BIT(0) 65 66 #define XLP9XX_I2C_MFIFOCTRL_HITH_SHIFT 8 67 #define XLP9XX_I2C_MFIFOCTRL_LOTH_SHIFT 0 68 #define XLP9XX_I2C_MFIFOCTRL_RST BIT(16) 69 70 #define XLP9XX_I2C_SLAVEADDR_RW BIT(0) 71 #define XLP9XX_I2C_SLAVEADDR_ADDR_SHIFT 1 72 73 #define XLP9XX_I2C_IP_CLK_FREQ 133000000UL 74 #define XLP9XX_I2C_FIFO_SIZE 0x80U 75 #define XLP9XX_I2C_TIMEOUT_MS 1000 76 #define XLP9XX_I2C_BUSY_TIMEOUT 50 77 78 #define XLP9XX_I2C_FIFO_WCNT_MASK 0xff 79 #define XLP9XX_I2C_STATUS_ERRMASK (XLP9XX_I2C_INTEN_ARLOST | \ 80 XLP9XX_I2C_INTEN_NACKADDR | XLP9XX_I2C_INTEN_BUSERR) 81 82 struct xlp9xx_i2c_dev { 83 struct device *dev; 84 struct i2c_adapter adapter; 85 struct completion msg_complete; 86 struct i2c_smbus_alert_setup alert_data; 87 struct i2c_client *ara; 88 int irq; 89 bool msg_read; 90 bool len_recv; 91 bool client_pec; 92 u32 __iomem *base; 93 u32 msg_buf_remaining; 94 u32 msg_len; 95 u32 ip_clk_hz; 96 u32 clk_hz; 97 u32 msg_err; 98 u8 *msg_buf; 99 }; 100 101 static inline void xlp9xx_write_i2c_reg(struct xlp9xx_i2c_dev *priv, 102 unsigned long reg, u32 val) 103 { 104 writel(val, priv->base + reg); 105 } 106 107 static inline u32 xlp9xx_read_i2c_reg(struct xlp9xx_i2c_dev *priv, 108 unsigned long reg) 109 { 110 return readl(priv->base + reg); 111 } 112 113 static void xlp9xx_i2c_mask_irq(struct xlp9xx_i2c_dev *priv, u32 mask) 114 { 115 u32 inten; 116 117 inten = xlp9xx_read_i2c_reg(priv, XLP9XX_I2C_INTEN) & ~mask; 118 xlp9xx_write_i2c_reg(priv, XLP9XX_I2C_INTEN, inten); 119 } 120 121 static void xlp9xx_i2c_unmask_irq(struct xlp9xx_i2c_dev *priv, u32 mask) 122 { 123 u32 inten; 124 125 inten = xlp9xx_read_i2c_reg(priv, XLP9XX_I2C_INTEN) | mask; 126 xlp9xx_write_i2c_reg(priv, XLP9XX_I2C_INTEN, inten); 127 } 128 129 static void xlp9xx_i2c_update_rx_fifo_thres(struct xlp9xx_i2c_dev *priv) 130 { 131 u32 thres; 132 133 if (priv->len_recv) 134 /* interrupt after the first read to examine 135 * the length byte before proceeding further 136 */ 137 thres = 1; 138 else if (priv->msg_buf_remaining > XLP9XX_I2C_FIFO_SIZE) 139 thres = XLP9XX_I2C_FIFO_SIZE; 140 else 141 thres = priv->msg_buf_remaining; 142 143 xlp9xx_write_i2c_reg(priv, XLP9XX_I2C_MFIFOCTRL, 144 thres << XLP9XX_I2C_MFIFOCTRL_HITH_SHIFT); 145 } 146 147 static void xlp9xx_i2c_fill_tx_fifo(struct xlp9xx_i2c_dev *priv) 148 { 149 u32 len, i; 150 u8 *buf = priv->msg_buf; 151 152 len = min(priv->msg_buf_remaining, XLP9XX_I2C_FIFO_SIZE); 153 for (i = 0; i < len; i++) 154 xlp9xx_write_i2c_reg(priv, XLP9XX_I2C_MTXFIFO, buf[i]); 155 priv->msg_buf_remaining -= len; 156 priv->msg_buf += len; 157 } 158 159 static void xlp9xx_i2c_update_rlen(struct xlp9xx_i2c_dev *priv) 160 { 161 u32 val, len; 162 163 /* 164 * Update receive length. Re-read len to get the latest value, 165 * and then add 4 to have a minimum value that can be safely 166 * written. This is to account for the byte read above, the 167 * transfer in progress and any delays in the register I/O 168 */ 169 val = xlp9xx_read_i2c_reg(priv, XLP9XX_I2C_CTRL); 170 len = xlp9xx_read_i2c_reg(priv, XLP9XX_I2C_FIFOWCNT) & 171 XLP9XX_I2C_FIFO_WCNT_MASK; 172 len = max_t(u32, priv->msg_len, len + 4); 173 if (len >= I2C_SMBUS_BLOCK_MAX + 2) 174 return; 175 val = (val & ~XLP9XX_I2C_CTRL_MCTLEN_MASK) | 176 (len << XLP9XX_I2C_CTRL_MCTLEN_SHIFT); 177 xlp9xx_write_i2c_reg(priv, XLP9XX_I2C_CTRL, val); 178 } 179 180 static void xlp9xx_i2c_drain_rx_fifo(struct xlp9xx_i2c_dev *priv) 181 { 182 u32 len, i; 183 u8 rlen, *buf = priv->msg_buf; 184 185 len = xlp9xx_read_i2c_reg(priv, XLP9XX_I2C_FIFOWCNT) & 186 XLP9XX_I2C_FIFO_WCNT_MASK; 187 if (!len) 188 return; 189 if (priv->len_recv) { 190 /* read length byte */ 191 rlen = xlp9xx_read_i2c_reg(priv, XLP9XX_I2C_MRXFIFO); 192 193 /* 194 * We expect at least 2 interrupts for I2C_M_RECV_LEN 195 * transactions. The length is updated during the first 196 * interrupt, and the buffer contents are only copied 197 * during subsequent interrupts. If in case the interrupts 198 * get merged we would complete the transaction without 199 * copying out the bytes from RX fifo. To avoid this now we 200 * drain the fifo as and when data is available. 201 * We drained the rlen byte already, decrement total length 202 * by one. 203 */ 204 205 len--; 206 if (rlen > I2C_SMBUS_BLOCK_MAX || rlen == 0) { 207 rlen = 0; /*abort transfer */ 208 priv->msg_buf_remaining = 0; 209 priv->msg_len = 0; 210 xlp9xx_i2c_update_rlen(priv); 211 return; 212 } 213 214 *buf++ = rlen; 215 if (priv->client_pec) 216 ++rlen; /* account for error check byte */ 217 /* update remaining bytes and message length */ 218 priv->msg_buf_remaining = rlen; 219 priv->msg_len = rlen + 1; 220 xlp9xx_i2c_update_rlen(priv); 221 priv->len_recv = false; 222 } 223 224 len = min(priv->msg_buf_remaining, len); 225 for (i = 0; i < len; i++, buf++) 226 *buf = xlp9xx_read_i2c_reg(priv, XLP9XX_I2C_MRXFIFO); 227 228 priv->msg_buf_remaining -= len; 229 priv->msg_buf = buf; 230 231 if (priv->msg_buf_remaining) 232 xlp9xx_i2c_update_rx_fifo_thres(priv); 233 } 234 235 static irqreturn_t xlp9xx_i2c_isr(int irq, void *dev_id) 236 { 237 struct xlp9xx_i2c_dev *priv = dev_id; 238 u32 status; 239 240 status = xlp9xx_read_i2c_reg(priv, XLP9XX_I2C_INTST); 241 if (status == 0) 242 return IRQ_NONE; 243 244 xlp9xx_write_i2c_reg(priv, XLP9XX_I2C_INTST, status); 245 if (status & XLP9XX_I2C_STATUS_ERRMASK) { 246 priv->msg_err = status; 247 goto xfer_done; 248 } 249 250 /* SADDR ACK for SMBUS_QUICK */ 251 if ((status & XLP9XX_I2C_INTEN_SADDR) && (priv->msg_len == 0)) 252 goto xfer_done; 253 254 if (!priv->msg_read) { 255 if (status & XLP9XX_I2C_INTEN_MFIFOEMTY) { 256 /* TX FIFO got empty, fill it up again */ 257 if (priv->msg_buf_remaining) 258 xlp9xx_i2c_fill_tx_fifo(priv); 259 else 260 xlp9xx_i2c_mask_irq(priv, 261 XLP9XX_I2C_INTEN_MFIFOEMTY); 262 } 263 } else { 264 if (status & (XLP9XX_I2C_INTEN_DATADONE | 265 XLP9XX_I2C_INTEN_MFIFOHI)) { 266 /* data is in FIFO, read it */ 267 if (priv->msg_buf_remaining) 268 xlp9xx_i2c_drain_rx_fifo(priv); 269 } 270 } 271 272 /* Transfer complete */ 273 if (status & XLP9XX_I2C_INTEN_DATADONE) 274 goto xfer_done; 275 276 return IRQ_HANDLED; 277 278 xfer_done: 279 xlp9xx_write_i2c_reg(priv, XLP9XX_I2C_INTEN, 0); 280 complete(&priv->msg_complete); 281 return IRQ_HANDLED; 282 } 283 284 static int xlp9xx_i2c_check_bus_status(struct xlp9xx_i2c_dev *priv) 285 { 286 u32 status; 287 u32 busy_timeout = XLP9XX_I2C_BUSY_TIMEOUT; 288 289 while (busy_timeout) { 290 status = xlp9xx_read_i2c_reg(priv, XLP9XX_I2C_STATUS); 291 if ((status & XLP9XX_I2C_STATUS_BUSY) == 0) 292 break; 293 294 busy_timeout--; 295 usleep_range(1000, 1100); 296 } 297 298 if (!busy_timeout) 299 return -EIO; 300 301 return 0; 302 } 303 304 static int xlp9xx_i2c_init(struct xlp9xx_i2c_dev *priv) 305 { 306 u32 prescale; 307 308 /* 309 * The controller uses 5 * SCL clock internally. 310 * So prescale value should be divided by 5. 311 */ 312 prescale = DIV_ROUND_UP(priv->ip_clk_hz, priv->clk_hz); 313 prescale = ((prescale - 8) / 5) - 1; 314 xlp9xx_write_i2c_reg(priv, XLP9XX_I2C_CTRL, XLP9XX_I2C_CTRL_RST); 315 xlp9xx_write_i2c_reg(priv, XLP9XX_I2C_CTRL, XLP9XX_I2C_CTRL_EN | 316 XLP9XX_I2C_CTRL_MASTER); 317 xlp9xx_write_i2c_reg(priv, XLP9XX_I2C_DIV, prescale); 318 xlp9xx_write_i2c_reg(priv, XLP9XX_I2C_INTEN, 0); 319 320 return 0; 321 } 322 323 static int xlp9xx_i2c_xfer_msg(struct xlp9xx_i2c_dev *priv, struct i2c_msg *msg, 324 int last_msg) 325 { 326 unsigned long timeleft; 327 u32 intr_mask, cmd, val, len; 328 329 priv->msg_buf = msg->buf; 330 priv->msg_buf_remaining = priv->msg_len = msg->len; 331 priv->msg_err = 0; 332 priv->msg_read = (msg->flags & I2C_M_RD); 333 reinit_completion(&priv->msg_complete); 334 335 /* Reset FIFO */ 336 xlp9xx_write_i2c_reg(priv, XLP9XX_I2C_MFIFOCTRL, 337 XLP9XX_I2C_MFIFOCTRL_RST); 338 339 /* set slave addr */ 340 xlp9xx_write_i2c_reg(priv, XLP9XX_I2C_SLAVEADDR, 341 (msg->addr << XLP9XX_I2C_SLAVEADDR_ADDR_SHIFT) | 342 (priv->msg_read ? XLP9XX_I2C_SLAVEADDR_RW : 0)); 343 344 /* Build control word for transfer */ 345 val = xlp9xx_read_i2c_reg(priv, XLP9XX_I2C_CTRL); 346 if (!priv->msg_read) 347 val &= ~XLP9XX_I2C_CTRL_FIFORD; 348 else 349 val |= XLP9XX_I2C_CTRL_FIFORD; /* read */ 350 351 if (msg->flags & I2C_M_TEN) 352 val |= XLP9XX_I2C_CTRL_ADDMODE; /* 10-bit address mode*/ 353 else 354 val &= ~XLP9XX_I2C_CTRL_ADDMODE; 355 356 priv->len_recv = msg->flags & I2C_M_RECV_LEN; 357 len = priv->len_recv ? I2C_SMBUS_BLOCK_MAX + 2 : msg->len; 358 priv->client_pec = msg->flags & I2C_CLIENT_PEC; 359 360 /* set FIFO threshold if reading */ 361 if (priv->msg_read) 362 xlp9xx_i2c_update_rx_fifo_thres(priv); 363 364 /* set data length to be transferred */ 365 val = (val & ~XLP9XX_I2C_CTRL_MCTLEN_MASK) | 366 (len << XLP9XX_I2C_CTRL_MCTLEN_SHIFT); 367 xlp9xx_write_i2c_reg(priv, XLP9XX_I2C_CTRL, val); 368 369 /* fill fifo during tx */ 370 if (!priv->msg_read) 371 xlp9xx_i2c_fill_tx_fifo(priv); 372 373 /* set interrupt mask */ 374 intr_mask = (XLP9XX_I2C_INTEN_ARLOST | XLP9XX_I2C_INTEN_BUSERR | 375 XLP9XX_I2C_INTEN_NACKADDR | XLP9XX_I2C_INTEN_DATADONE); 376 377 if (priv->msg_read) { 378 intr_mask |= XLP9XX_I2C_INTEN_MFIFOHI; 379 if (msg->len == 0) 380 intr_mask |= XLP9XX_I2C_INTEN_SADDR; 381 } else { 382 if (msg->len == 0) 383 intr_mask |= XLP9XX_I2C_INTEN_SADDR; 384 else 385 intr_mask |= XLP9XX_I2C_INTEN_MFIFOEMTY; 386 } 387 xlp9xx_i2c_unmask_irq(priv, intr_mask); 388 389 /* set cmd reg */ 390 cmd = XLP9XX_I2C_CMD_START; 391 if (msg->len) 392 cmd |= (priv->msg_read ? 393 XLP9XX_I2C_CMD_READ : XLP9XX_I2C_CMD_WRITE); 394 if (last_msg) 395 cmd |= XLP9XX_I2C_CMD_STOP; 396 397 xlp9xx_write_i2c_reg(priv, XLP9XX_I2C_CMD, cmd); 398 399 timeleft = msecs_to_jiffies(XLP9XX_I2C_TIMEOUT_MS); 400 timeleft = wait_for_completion_timeout(&priv->msg_complete, timeleft); 401 402 if (priv->msg_err & XLP9XX_I2C_INTEN_BUSERR) { 403 dev_dbg(priv->dev, "transfer error %x!\n", priv->msg_err); 404 xlp9xx_write_i2c_reg(priv, XLP9XX_I2C_CMD, XLP9XX_I2C_CMD_STOP); 405 return -EIO; 406 } else if (priv->msg_err & XLP9XX_I2C_INTEN_NACKADDR) { 407 return -ENXIO; 408 } 409 410 if (timeleft == 0) { 411 dev_dbg(priv->dev, "i2c transfer timed out!\n"); 412 xlp9xx_i2c_init(priv); 413 return -ETIMEDOUT; 414 } 415 416 /* update msg->len with actual received length */ 417 if (msg->flags & I2C_M_RECV_LEN) { 418 if (!priv->msg_len) 419 return -EPROTO; 420 msg->len = priv->msg_len; 421 } 422 return 0; 423 } 424 425 static int xlp9xx_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, 426 int num) 427 { 428 int i, ret; 429 struct xlp9xx_i2c_dev *priv = i2c_get_adapdata(adap); 430 431 ret = xlp9xx_i2c_check_bus_status(priv); 432 if (ret) { 433 xlp9xx_i2c_init(priv); 434 ret = xlp9xx_i2c_check_bus_status(priv); 435 if (ret) 436 return ret; 437 } 438 439 for (i = 0; i < num; i++) { 440 ret = xlp9xx_i2c_xfer_msg(priv, &msgs[i], i == num - 1); 441 if (ret != 0) 442 return ret; 443 } 444 445 return num; 446 } 447 448 static u32 xlp9xx_i2c_functionality(struct i2c_adapter *adapter) 449 { 450 return I2C_FUNC_SMBUS_EMUL | I2C_FUNC_SMBUS_READ_BLOCK_DATA | 451 I2C_FUNC_I2C | I2C_FUNC_10BIT_ADDR; 452 } 453 454 static const struct i2c_algorithm xlp9xx_i2c_algo = { 455 .master_xfer = xlp9xx_i2c_xfer, 456 .functionality = xlp9xx_i2c_functionality, 457 }; 458 459 static int xlp9xx_i2c_get_frequency(struct platform_device *pdev, 460 struct xlp9xx_i2c_dev *priv) 461 { 462 struct clk *clk; 463 u32 freq; 464 int err; 465 466 clk = devm_clk_get(&pdev->dev, NULL); 467 if (IS_ERR(clk)) { 468 priv->ip_clk_hz = XLP9XX_I2C_IP_CLK_FREQ; 469 dev_dbg(&pdev->dev, "using default input frequency %u\n", 470 priv->ip_clk_hz); 471 } else { 472 priv->ip_clk_hz = clk_get_rate(clk); 473 } 474 475 err = device_property_read_u32(&pdev->dev, "clock-frequency", &freq); 476 if (err) { 477 freq = I2C_MAX_STANDARD_MODE_FREQ; 478 dev_dbg(&pdev->dev, "using default frequency %u\n", freq); 479 } else if (freq == 0 || freq > I2C_MAX_FAST_MODE_FREQ) { 480 dev_warn(&pdev->dev, "invalid frequency %u, using default\n", 481 freq); 482 freq = I2C_MAX_STANDARD_MODE_FREQ; 483 } 484 priv->clk_hz = freq; 485 486 return 0; 487 } 488 489 static int xlp9xx_i2c_smbus_setup(struct xlp9xx_i2c_dev *priv, 490 struct platform_device *pdev) 491 { 492 struct i2c_client *ara; 493 494 if (!priv->alert_data.irq) 495 return -EINVAL; 496 497 ara = i2c_new_smbus_alert_device(&priv->adapter, &priv->alert_data); 498 if (IS_ERR(ara)) 499 return PTR_ERR(ara); 500 501 priv->ara = ara; 502 503 return 0; 504 } 505 506 static int xlp9xx_i2c_probe(struct platform_device *pdev) 507 { 508 struct xlp9xx_i2c_dev *priv; 509 int err = 0; 510 511 priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); 512 if (!priv) 513 return -ENOMEM; 514 515 priv->base = devm_platform_ioremap_resource(pdev, 0); 516 if (IS_ERR(priv->base)) 517 return PTR_ERR(priv->base); 518 519 priv->irq = platform_get_irq(pdev, 0); 520 if (priv->irq < 0) 521 return priv->irq; 522 /* SMBAlert irq */ 523 priv->alert_data.irq = platform_get_irq(pdev, 1); 524 if (priv->alert_data.irq <= 0) 525 priv->alert_data.irq = 0; 526 527 xlp9xx_i2c_get_frequency(pdev, priv); 528 xlp9xx_i2c_init(priv); 529 530 err = devm_request_irq(&pdev->dev, priv->irq, xlp9xx_i2c_isr, 0, 531 pdev->name, priv); 532 if (err) 533 return dev_err_probe(&pdev->dev, err, "IRQ request failed!\n"); 534 535 init_completion(&priv->msg_complete); 536 priv->adapter.dev.parent = &pdev->dev; 537 priv->adapter.algo = &xlp9xx_i2c_algo; 538 priv->adapter.class = I2C_CLASS_HWMON; 539 ACPI_COMPANION_SET(&priv->adapter.dev, ACPI_COMPANION(&pdev->dev)); 540 priv->adapter.dev.of_node = pdev->dev.of_node; 541 priv->dev = &pdev->dev; 542 543 snprintf(priv->adapter.name, sizeof(priv->adapter.name), "xlp9xx-i2c"); 544 i2c_set_adapdata(&priv->adapter, priv); 545 546 err = i2c_add_adapter(&priv->adapter); 547 if (err) 548 return err; 549 550 err = xlp9xx_i2c_smbus_setup(priv, pdev); 551 if (err) 552 dev_dbg(&pdev->dev, "No active SMBus alert %d\n", err); 553 554 platform_set_drvdata(pdev, priv); 555 dev_dbg(&pdev->dev, "I2C bus:%d added\n", priv->adapter.nr); 556 557 return 0; 558 } 559 560 static void xlp9xx_i2c_remove(struct platform_device *pdev) 561 { 562 struct xlp9xx_i2c_dev *priv; 563 564 priv = platform_get_drvdata(pdev); 565 xlp9xx_write_i2c_reg(priv, XLP9XX_I2C_INTEN, 0); 566 synchronize_irq(priv->irq); 567 i2c_del_adapter(&priv->adapter); 568 xlp9xx_write_i2c_reg(priv, XLP9XX_I2C_CTRL, 0); 569 } 570 571 #ifdef CONFIG_ACPI 572 static const struct acpi_device_id xlp9xx_i2c_acpi_ids[] = { 573 {"BRCM9007", 0}, 574 {"CAV9007", 0}, 575 {} 576 }; 577 MODULE_DEVICE_TABLE(acpi, xlp9xx_i2c_acpi_ids); 578 #endif 579 580 static struct platform_driver xlp9xx_i2c_driver = { 581 .probe = xlp9xx_i2c_probe, 582 .remove_new = xlp9xx_i2c_remove, 583 .driver = { 584 .name = "xlp9xx-i2c", 585 .acpi_match_table = ACPI_PTR(xlp9xx_i2c_acpi_ids), 586 }, 587 }; 588 589 module_platform_driver(xlp9xx_i2c_driver); 590 591 MODULE_AUTHOR("Subhendu Sekhar Behera <sbehera@broadcom.com>"); 592 MODULE_DESCRIPTION("XLP9XX/5XX I2C Bus Controller Driver"); 593 MODULE_LICENSE("GPL v2"); 594