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_DEFAULT_FREQ         100000
  75 #define XLP9XX_I2C_HIGH_FREQ            400000
  76 #define XLP9XX_I2C_FIFO_SIZE            0x80U
  77 #define XLP9XX_I2C_TIMEOUT_MS           1000
  78 #define XLP9XX_I2C_BUSY_TIMEOUT         50
  79
  80 #define XLP9XX_I2C_FIFO_WCNT_MASK       0xff
  81 #define XLP9XX_I2C_STATUS_ERRMASK       (XLP9XX_I2C_INTEN_ARLOST | \
  82                         XLP9XX_I2C_INTEN_NACKADDR | XLP9XX_I2C_INTEN_BUSERR)
  83
  84 struct xlp9xx_i2c_dev {
  85         struct device *dev;
  86         struct i2c_adapter adapter;
  87         struct completion msg_complete;
  88         struct i2c_smbus_alert_setup alert_data;
  89         struct i2c_client *ara;
  90         int irq;
  91         bool msg_read;
  92         bool len_recv;
  93         bool client_pec;
  94         u32 __iomem *base;
  95         u32 msg_buf_remaining;
  96         u32 msg_len;
  97         u32 ip_clk_hz;
  98         u32 clk_hz;
  99         u32 msg_err;
 100         u8 *msg_buf;
 101 };
 102
 103 static inline void xlp9xx_write_i2c_reg(struct xlp9xx_i2c_dev *priv,
 104                                         unsigned long reg, u32 val)
 105 {
 106         writel(val, priv->base + reg);
 107 }
 108
 109 static inline u32 xlp9xx_read_i2c_reg(struct xlp9xx_i2c_dev *priv,
 110                                       unsigned long reg)
 111 {
 112         return readl(priv->base + reg);
 113 }
 114
 115 static void xlp9xx_i2c_mask_irq(struct xlp9xx_i2c_dev *priv, u32 mask)
 116 {
 117         u32 inten;
 118
 119         inten = xlp9xx_read_i2c_reg(priv, XLP9XX_I2C_INTEN) & ~mask;
 120         xlp9xx_write_i2c_reg(priv, XLP9XX_I2C_INTEN, inten);
 121 }
 122
 123 static void xlp9xx_i2c_unmask_irq(struct xlp9xx_i2c_dev *priv, u32 mask)
 124 {
 125         u32 inten;
 126
 127         inten = xlp9xx_read_i2c_reg(priv, XLP9XX_I2C_INTEN) | mask;
 128         xlp9xx_write_i2c_reg(priv, XLP9XX_I2C_INTEN, inten);
 129 }
 130
 131 static void xlp9xx_i2c_update_rx_fifo_thres(struct xlp9xx_i2c_dev *priv)
 132 {
 133         u32 thres;
 134
 135         if (priv->len_recv)
 136                 /* interrupt after the first read to examine
 137                  * the length byte before proceeding further
 138                  */
 139                 thres = 1;
 140         else if (priv->msg_buf_remaining > XLP9XX_I2C_FIFO_SIZE)
 141                 thres = XLP9XX_I2C_FIFO_SIZE;
 142         else
 143                 thres = priv->msg_buf_remaining;
 144
 145         xlp9xx_write_i2c_reg(priv, XLP9XX_I2C_MFIFOCTRL,
 146                              thres << XLP9XX_I2C_MFIFOCTRL_HITH_SHIFT);
 147 }
 148
 149 static void xlp9xx_i2c_fill_tx_fifo(struct xlp9xx_i2c_dev *priv)
 150 {
 151         u32 len, i;
 152         u8 *buf = priv->msg_buf;
 153
 154         len = min(priv->msg_buf_remaining, XLP9XX_I2C_FIFO_SIZE);
 155         for (i = 0; i < len; i++)
 156                 xlp9xx_write_i2c_reg(priv, XLP9XX_I2C_MTXFIFO, buf[i]);
 157         priv->msg_buf_remaining -= len;
 158         priv->msg_buf += len;
 159 }
 160
 161 static void xlp9xx_i2c_update_rlen(struct xlp9xx_i2c_dev *priv)
 162 {
 163         u32 val, len;
 164
 165         /*
 166          * Update receive length. Re-read len to get the latest value,
 167          * and then add 4 to have a minimum value that can be safely
 168          * written. This is to account for the byte read above, the
 169          * transfer in progress and any delays in the register I/O
 170          */
 171         val = xlp9xx_read_i2c_reg(priv, XLP9XX_I2C_CTRL);
 172         len = xlp9xx_read_i2c_reg(priv, XLP9XX_I2C_FIFOWCNT) &
 173                                   XLP9XX_I2C_FIFO_WCNT_MASK;
 174         len = max_t(u32, priv->msg_len, len + 4);
 175         if (len >= I2C_SMBUS_BLOCK_MAX + 2)
 176                 return;
 177         val = (val & ~XLP9XX_I2C_CTRL_MCTLEN_MASK) |
 178                         (len << XLP9XX_I2C_CTRL_MCTLEN_SHIFT);
 179         xlp9xx_write_i2c_reg(priv, XLP9XX_I2C_CTRL, val);
 180 }
 181
 182 static void xlp9xx_i2c_drain_rx_fifo(struct xlp9xx_i2c_dev *priv)
 183 {
 184         u32 len, i;
 185         u8 rlen, *buf = priv->msg_buf;
 186
 187         len = xlp9xx_read_i2c_reg(priv, XLP9XX_I2C_FIFOWCNT) &
 188                                   XLP9XX_I2C_FIFO_WCNT_MASK;
 189         if (!len)
 190                 return;
 191         if (priv->len_recv) {
 192                 /* read length byte */
 193                 rlen = xlp9xx_read_i2c_reg(priv, XLP9XX_I2C_MRXFIFO);
 194                 if (rlen > I2C_SMBUS_BLOCK_MAX || rlen == 0) {
 195                         rlen = 0;       /*abort transfer */
 196                         priv->msg_buf_remaining = 0;
 197                         priv->msg_len = 0;
 198                 } else {
 199                         *buf++ = rlen;
 200                         if (priv->client_pec)
 201                                 ++rlen; /* account for error check byte */
 202                         /* update remaining bytes and message length */
 203                         priv->msg_buf_remaining = rlen;
 204                         priv->msg_len = rlen + 1;
 205                 }
 206                 xlp9xx_i2c_update_rlen(priv);
 207                 priv->len_recv = false;
 208         } else {
 209                 len = min(priv->msg_buf_remaining, len);
 210                 for (i = 0; i < len; i++, buf++)
 211                         *buf = xlp9xx_read_i2c_reg(priv, XLP9XX_I2C_MRXFIFO);
 212
 213                 priv->msg_buf_remaining -= len;
 214         }
 215
 216         priv->msg_buf = buf;
 217
 218         if (priv->msg_buf_remaining)
 219                 xlp9xx_i2c_update_rx_fifo_thres(priv);
 220 }
 221
 222 static irqreturn_t xlp9xx_i2c_isr(int irq, void *dev_id)
 223 {
 224         struct xlp9xx_i2c_dev *priv = dev_id;
 225         u32 status;
 226
 227         status = xlp9xx_read_i2c_reg(priv, XLP9XX_I2C_INTST);
 228         if (status == 0)
 229                 return IRQ_NONE;
 230
 231         xlp9xx_write_i2c_reg(priv, XLP9XX_I2C_INTST, status);
 232         if (status & XLP9XX_I2C_STATUS_ERRMASK) {
 233                 priv->msg_err = status;
 234                 goto xfer_done;
 235         }
 236
 237         /* SADDR ACK for SMBUS_QUICK */
 238         if ((status & XLP9XX_I2C_INTEN_SADDR) && (priv->msg_len == 0))
 239                 goto xfer_done;
 240
 241         if (!priv->msg_read) {
 242                 if (status & XLP9XX_I2C_INTEN_MFIFOEMTY) {
 243                         /* TX FIFO got empty, fill it up again */
 244                         if (priv->msg_buf_remaining)
 245                                 xlp9xx_i2c_fill_tx_fifo(priv);
 246                         else
 247                                 xlp9xx_i2c_mask_irq(priv,
 248                                                     XLP9XX_I2C_INTEN_MFIFOEMTY);
 249                 }
 250         } else {
 251                 if (status & (XLP9XX_I2C_INTEN_DATADONE |
 252                               XLP9XX_I2C_INTEN_MFIFOHI)) {
 253                         /* data is in FIFO, read it */
 254                         if (priv->msg_buf_remaining)
 255                                 xlp9xx_i2c_drain_rx_fifo(priv);
 256                 }
 257         }
 258
 259         /* Transfer complete */
 260         if (status & XLP9XX_I2C_INTEN_DATADONE)
 261                 goto xfer_done;
 262
 263         return IRQ_HANDLED;
 264
 265 xfer_done:
 266         xlp9xx_write_i2c_reg(priv, XLP9XX_I2C_INTEN, 0);
 267         complete(&priv->msg_complete);
 268         return IRQ_HANDLED;
 269 }
 270
 271 static int xlp9xx_i2c_check_bus_status(struct xlp9xx_i2c_dev *priv)
 272 {
 273         u32 status;
 274         u32 busy_timeout = XLP9XX_I2C_BUSY_TIMEOUT;
 275
 276         while (busy_timeout) {
 277                 status = xlp9xx_read_i2c_reg(priv, XLP9XX_I2C_STATUS);
 278                 if ((status & XLP9XX_I2C_STATUS_BUSY) == 0)
 279                         break;
 280
 281                 busy_timeout--;
 282                 usleep_range(1000, 1100);
 283         }
 284
 285         if (!busy_timeout)
 286                 return -EIO;
 287
 288         return 0;
 289 }
 290
 291 static int xlp9xx_i2c_init(struct xlp9xx_i2c_dev *priv)
 292 {
 293         u32 prescale;
 294
 295         /*
 296          * The controller uses 5 * SCL clock internally.
 297          * So prescale value should be divided by 5.
 298          */
 299         prescale = DIV_ROUND_UP(priv->ip_clk_hz, priv->clk_hz);
 300         prescale = ((prescale - 8) / 5) - 1;
 301         xlp9xx_write_i2c_reg(priv, XLP9XX_I2C_CTRL, XLP9XX_I2C_CTRL_RST);
 302         xlp9xx_write_i2c_reg(priv, XLP9XX_I2C_CTRL, XLP9XX_I2C_CTRL_EN |
 303                              XLP9XX_I2C_CTRL_MASTER);
 304         xlp9xx_write_i2c_reg(priv, XLP9XX_I2C_DIV, prescale);
 305         xlp9xx_write_i2c_reg(priv, XLP9XX_I2C_INTEN, 0);
 306
 307         return 0;
 308 }
 309
 310 static int xlp9xx_i2c_xfer_msg(struct xlp9xx_i2c_dev *priv, struct i2c_msg *msg,
 311                                int last_msg)
 312 {
 313         unsigned long timeleft;
 314         u32 intr_mask, cmd, val, len;
 315
 316         priv->msg_buf = msg->buf;
 317         priv->msg_buf_remaining = priv->msg_len = msg->len;
 318         priv->msg_err = 0;
 319         priv->msg_read = (msg->flags & I2C_M_RD);
 320         reinit_completion(&priv->msg_complete);
 321
 322         /* Reset FIFO */
 323         xlp9xx_write_i2c_reg(priv, XLP9XX_I2C_MFIFOCTRL,
 324                              XLP9XX_I2C_MFIFOCTRL_RST);
 325
 326         /* set slave addr */
 327         xlp9xx_write_i2c_reg(priv, XLP9XX_I2C_SLAVEADDR,
 328                              (msg->addr << XLP9XX_I2C_SLAVEADDR_ADDR_SHIFT) |
 329                              (priv->msg_read ? XLP9XX_I2C_SLAVEADDR_RW : 0));
 330
 331         /* Build control word for transfer */
 332         val = xlp9xx_read_i2c_reg(priv, XLP9XX_I2C_CTRL);
 333         if (!priv->msg_read)
 334                 val &= ~XLP9XX_I2C_CTRL_FIFORD;
 335         else
 336                 val |= XLP9XX_I2C_CTRL_FIFORD;  /* read */
 337
 338         if (msg->flags & I2C_M_TEN)
 339                 val |= XLP9XX_I2C_CTRL_ADDMODE; /* 10-bit address mode*/
 340         else
 341                 val &= ~XLP9XX_I2C_CTRL_ADDMODE;
 342
 343         priv->len_recv = msg->flags & I2C_M_RECV_LEN;
 344         len = priv->len_recv ? I2C_SMBUS_BLOCK_MAX + 2 : msg->len;
 345         priv->client_pec = msg->flags & I2C_CLIENT_PEC;
 346
 347         /* set FIFO threshold if reading */
 348         if (priv->msg_read)
 349                 xlp9xx_i2c_update_rx_fifo_thres(priv);
 350
 351         /* set data length to be transferred */
 352         val = (val & ~XLP9XX_I2C_CTRL_MCTLEN_MASK) |
 353               (len << XLP9XX_I2C_CTRL_MCTLEN_SHIFT);
 354         xlp9xx_write_i2c_reg(priv, XLP9XX_I2C_CTRL, val);
 355
 356         /* fill fifo during tx */
 357         if (!priv->msg_read)
 358                 xlp9xx_i2c_fill_tx_fifo(priv);
 359
 360         /* set interrupt mask */
 361         intr_mask = (XLP9XX_I2C_INTEN_ARLOST | XLP9XX_I2C_INTEN_BUSERR |
 362                      XLP9XX_I2C_INTEN_NACKADDR | XLP9XX_I2C_INTEN_DATADONE);
 363
 364         if (priv->msg_read) {
 365                 intr_mask |= XLP9XX_I2C_INTEN_MFIFOHI;
 366                 if (msg->len == 0)
 367                         intr_mask |= XLP9XX_I2C_INTEN_SADDR;
 368         } else {
 369                 if (msg->len == 0)
 370                         intr_mask |= XLP9XX_I2C_INTEN_SADDR;
 371                 else
 372                         intr_mask |= XLP9XX_I2C_INTEN_MFIFOEMTY;
 373         }
 374         xlp9xx_i2c_unmask_irq(priv, intr_mask);
 375
 376         /* set cmd reg */
 377         cmd = XLP9XX_I2C_CMD_START;
 378         if (msg->len)
 379                 cmd |= (priv->msg_read ?
 380                         XLP9XX_I2C_CMD_READ : XLP9XX_I2C_CMD_WRITE);
 381         if (last_msg)
 382                 cmd |= XLP9XX_I2C_CMD_STOP;
 383
 384         xlp9xx_write_i2c_reg(priv, XLP9XX_I2C_CMD, cmd);
 385
 386         timeleft = msecs_to_jiffies(XLP9XX_I2C_TIMEOUT_MS);
 387         timeleft = wait_for_completion_timeout(&priv->msg_complete, timeleft);
 388
 389         if (priv->msg_err & XLP9XX_I2C_INTEN_BUSERR) {
 390                 dev_dbg(priv->dev, "transfer error %x!\n", priv->msg_err);
 391                 xlp9xx_write_i2c_reg(priv, XLP9XX_I2C_CMD, XLP9XX_I2C_CMD_STOP);
 392                 return -EIO;
 393         } else if (priv->msg_err & XLP9XX_I2C_INTEN_NACKADDR) {
 394                 return -ENXIO;
 395         }
 396
 397         if (timeleft == 0) {
 398                 dev_dbg(priv->dev, "i2c transfer timed out!\n");
 399                 xlp9xx_i2c_init(priv);
 400                 return -ETIMEDOUT;
 401         }
 402
 403         /* update msg->len with actual received length */
 404         if (msg->flags & I2C_M_RECV_LEN) {
 405                 if (!priv->msg_len)
 406                         return -EPROTO;
 407                 msg->len = priv->msg_len;
 408         }
 409         return 0;
 410 }
 411
 412 static int xlp9xx_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs,
 413                            int num)
 414 {
 415         int i, ret;
 416         struct xlp9xx_i2c_dev *priv = i2c_get_adapdata(adap);
 417
 418         ret = xlp9xx_i2c_check_bus_status(priv);
 419         if (ret) {
 420                 xlp9xx_i2c_init(priv);
 421                 ret = xlp9xx_i2c_check_bus_status(priv);
 422                 if (ret)
 423                         return ret;
 424         }
 425
 426         for (i = 0; i < num; i++) {
 427                 ret = xlp9xx_i2c_xfer_msg(priv, &msgs[i], i == num - 1);
 428                 if (ret != 0)
 429                         return ret;
 430         }
 431
 432         return num;
 433 }
 434
 435 static u32 xlp9xx_i2c_functionality(struct i2c_adapter *adapter)
 436 {
 437         return I2C_FUNC_SMBUS_EMUL | I2C_FUNC_SMBUS_READ_BLOCK_DATA |
 438                         I2C_FUNC_I2C | I2C_FUNC_10BIT_ADDR;
 439 }
 440
 441 static const struct i2c_algorithm xlp9xx_i2c_algo = {
 442         .master_xfer = xlp9xx_i2c_xfer,
 443         .functionality = xlp9xx_i2c_functionality,
 444 };
 445
 446 static int xlp9xx_i2c_get_frequency(struct platform_device *pdev,
 447                                     struct xlp9xx_i2c_dev *priv)
 448 {
 449         struct clk *clk;
 450         u32 freq;
 451         int err;
 452
 453         clk = devm_clk_get(&pdev->dev, NULL);
 454         if (IS_ERR(clk)) {
 455                 priv->ip_clk_hz = XLP9XX_I2C_IP_CLK_FREQ;
 456                 dev_dbg(&pdev->dev, "using default input frequency %u\n",
 457                         priv->ip_clk_hz);
 458         } else {
 459                 priv->ip_clk_hz = clk_get_rate(clk);
 460         }
 461
 462         err = device_property_read_u32(&pdev->dev, "clock-frequency", &freq);
 463         if (err) {
 464                 freq = XLP9XX_I2C_DEFAULT_FREQ;
 465                 dev_dbg(&pdev->dev, "using default frequency %u\n", freq);
 466         } else if (freq == 0 || freq > XLP9XX_I2C_HIGH_FREQ) {
 467                 dev_warn(&pdev->dev, "invalid frequency %u, using default\n",
 468                          freq);
 469                 freq = XLP9XX_I2C_DEFAULT_FREQ;
 470         }
 471         priv->clk_hz = freq;
 472
 473         return 0;
 474 }
 475
 476 static int xlp9xx_i2c_smbus_setup(struct xlp9xx_i2c_dev *priv,
 477                                   struct platform_device *pdev)
 478 {
 479         if (!priv->alert_data.irq)
 480                 return -EINVAL;
 481
 482         priv->ara = i2c_setup_smbus_alert(&priv->adapter, &priv->alert_data);
 483         if (!priv->ara)
 484                 return -ENODEV;
 485
 486         return 0;
 487 }
 488
 489 static int xlp9xx_i2c_probe(struct platform_device *pdev)
 490 {
 491         struct xlp9xx_i2c_dev *priv;
 492         struct resource *res;
 493         int err = 0;
 494
 495         priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
 496         if (!priv)
 497                 return -ENOMEM;
 498
 499         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 500         priv->base = devm_ioremap_resource(&pdev->dev, res);
 501         if (IS_ERR(priv->base))
 502                 return PTR_ERR(priv->base);
 503
 504         priv->irq = platform_get_irq(pdev, 0);
 505         if (priv->irq <= 0) {
 506                 dev_err(&pdev->dev, "invalid irq!\n");
 507                 return priv->irq;
 508         }
 509         /* SMBAlert irq */
 510         priv->alert_data.irq = platform_get_irq(pdev, 1);
 511         if (priv->alert_data.irq <= 0)
 512                 priv->alert_data.irq = 0;
 513
 514         xlp9xx_i2c_get_frequency(pdev, priv);
 515         xlp9xx_i2c_init(priv);
 516
 517         err = devm_request_irq(&pdev->dev, priv->irq, xlp9xx_i2c_isr, 0,
 518                                pdev->name, priv);
 519         if (err) {
 520                 dev_err(&pdev->dev, "IRQ request failed!\n");
 521                 return err;
 522         }
 523
 524         init_completion(&priv->msg_complete);
 525         priv->adapter.dev.parent = &pdev->dev;
 526         priv->adapter.algo = &xlp9xx_i2c_algo;
 527         priv->adapter.class = I2C_CLASS_HWMON;
 528         ACPI_COMPANION_SET(&priv->adapter.dev, ACPI_COMPANION(&pdev->dev));
 529         priv->adapter.dev.of_node = pdev->dev.of_node;
 530         priv->dev = &pdev->dev;
 531
 532         snprintf(priv->adapter.name, sizeof(priv->adapter.name), "xlp9xx-i2c");
 533         i2c_set_adapdata(&priv->adapter, priv);
 534
 535         err = i2c_add_adapter(&priv->adapter);
 536         if (err)
 537                 return err;
 538
 539         err = xlp9xx_i2c_smbus_setup(priv, pdev);
 540         if (err)
 541                 dev_dbg(&pdev->dev, "No active SMBus alert %d\n", err);
 542
 543         platform_set_drvdata(pdev, priv);
 544         dev_dbg(&pdev->dev, "I2C bus:%d added\n", priv->adapter.nr);
 545
 546         return 0;
 547 }
 548
 549 static int xlp9xx_i2c_remove(struct platform_device *pdev)
 550 {
 551         struct xlp9xx_i2c_dev *priv;
 552
 553         priv = platform_get_drvdata(pdev);
 554         xlp9xx_write_i2c_reg(priv, XLP9XX_I2C_INTEN, 0);
 555         synchronize_irq(priv->irq);
 556         i2c_del_adapter(&priv->adapter);
 557         xlp9xx_write_i2c_reg(priv, XLP9XX_I2C_CTRL, 0);
 558
 559         return 0;
 560 }
 561
 562 static const struct of_device_id xlp9xx_i2c_of_match[] = {
 563         { .compatible = "netlogic,xlp980-i2c", },
 564         { /* sentinel */ },
 565 };
 566 MODULE_DEVICE_TABLE(of, xlp9xx_i2c_of_match);
 567
 568 #ifdef CONFIG_ACPI
 569 static const struct acpi_device_id xlp9xx_i2c_acpi_ids[] = {
 570         {"BRCM9007", 0},
 571         {"CAV9007",  0},
 572         {}
 573 };
 574 MODULE_DEVICE_TABLE(acpi, xlp9xx_i2c_acpi_ids);
 575 #endif
 576
 577 static struct platform_driver xlp9xx_i2c_driver = {
 578         .probe = xlp9xx_i2c_probe,
 579         .remove = xlp9xx_i2c_remove,
 580         .driver = {
 581                 .name = "xlp9xx-i2c",
 582                 .of_match_table = xlp9xx_i2c_of_match,
 583                 .acpi_match_table = ACPI_PTR(xlp9xx_i2c_acpi_ids),
 584         },
 585 };
 586
 587 module_platform_driver(xlp9xx_i2c_driver);
 588
 589 MODULE_AUTHOR("Subhendu Sekhar Behera <sbehera@broadcom.com>");
 590 MODULE_DESCRIPTION("XLP9XX/5XX I2C Bus Controller Driver");
 591 MODULE_LICENSE("GPL v2");