drivers/i2c/busses/i2c-xlp9xx.c

   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                 dev_err(&pdev->dev, "IRQ request failed!\n");
 534                 return err;
 535         }
 536
 537         init_completion(&priv->msg_complete);
 538         priv->adapter.dev.parent = &pdev->dev;
 539         priv->adapter.algo = &xlp9xx_i2c_algo;
 540         priv->adapter.class = I2C_CLASS_HWMON;
 541         ACPI_COMPANION_SET(&priv->adapter.dev, ACPI_COMPANION(&pdev->dev));
 542         priv->adapter.dev.of_node = pdev->dev.of_node;
 543         priv->dev = &pdev->dev;
 544
 545         snprintf(priv->adapter.name, sizeof(priv->adapter.name), "xlp9xx-i2c");
 546         i2c_set_adapdata(&priv->adapter, priv);
 547
 548         err = i2c_add_adapter(&priv->adapter);
 549         if (err)
 550                 return err;
 551
 552         err = xlp9xx_i2c_smbus_setup(priv, pdev);
 553         if (err)
 554                 dev_dbg(&pdev->dev, "No active SMBus alert %d\n", err);
 555
 556         platform_set_drvdata(pdev, priv);
 557         dev_dbg(&pdev->dev, "I2C bus:%d added\n", priv->adapter.nr);
 558
 559         return 0;
 560 }
 561
 562 static int xlp9xx_i2c_remove(struct platform_device *pdev)
 563 {
 564         struct xlp9xx_i2c_dev *priv;
 565
 566         priv = platform_get_drvdata(pdev);
 567         xlp9xx_write_i2c_reg(priv, XLP9XX_I2C_INTEN, 0);
 568         synchronize_irq(priv->irq);
 569         i2c_del_adapter(&priv->adapter);
 570         xlp9xx_write_i2c_reg(priv, XLP9XX_I2C_CTRL, 0);
 571
 572         return 0;
 573 }
 574
 575 static const struct of_device_id xlp9xx_i2c_of_match[] = {
 576         { .compatible = "netlogic,xlp980-i2c", },
 577         { /* sentinel */ },
 578 };
 579 MODULE_DEVICE_TABLE(of, xlp9xx_i2c_of_match);
 580
 581 #ifdef CONFIG_ACPI
 582 static const struct acpi_device_id xlp9xx_i2c_acpi_ids[] = {
 583         {"BRCM9007", 0},
 584         {"CAV9007",  0},
 585         {}
 586 };
 587 MODULE_DEVICE_TABLE(acpi, xlp9xx_i2c_acpi_ids);
 588 #endif
 589
 590 static struct platform_driver xlp9xx_i2c_driver = {
 591         .probe = xlp9xx_i2c_probe,
 592         .remove = xlp9xx_i2c_remove,
 593         .driver = {
 594                 .name = "xlp9xx-i2c",
 595                 .of_match_table = xlp9xx_i2c_of_match,
 596                 .acpi_match_table = ACPI_PTR(xlp9xx_i2c_acpi_ids),
 597         },
 598 };
 599
 600 module_platform_driver(xlp9xx_i2c_driver);
 601
 602 MODULE_AUTHOR("Subhendu Sekhar Behera <[email protected]>");
 603 MODULE_DESCRIPTION("XLP9XX/5XX I2C Bus Controller Driver");
 604 MODULE_LICENSE("GPL v2");