LXR linux/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
  82struct 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
 101static 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
 107static inline u32 xlp9xx_read_i2c_reg(struct xlp9xx_i2c_dev *priv,
 108                                      unsigned long reg)
 109{
 110        return readl(priv->base + reg);
 111}
 112
 113static 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
 121static 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
 129static 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
 147static 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
 159static 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
 180static 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
 235static 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
 278xfer_done:
 279        xlp9xx_write_i2c_reg(priv, XLP9XX_I2C_INTEN, 0);
 280        complete(&priv->msg_complete);
 281        return IRQ_HANDLED;
 282}
 283
 284static 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
 304static 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
 323static 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
 425static 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
 448static 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
 454static const struct i2c_algorithm xlp9xx_i2c_algo = {
 455        .master_xfer = xlp9xx_i2c_xfer,
 456        .functionality = xlp9xx_i2c_functionality,
 457};
 458
 459static 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
 489static 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
 506static 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
 562static 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
 575static const struct of_device_id xlp9xx_i2c_of_match[] = {
 576        { .compatible = "netlogic,xlp980-i2c", },
 577        { /* sentinel */ },
 578};
 579MODULE_DEVICE_TABLE(of, xlp9xx_i2c_of_match);
 580
 581#ifdef CONFIG_ACPI
 582static const struct acpi_device_id xlp9xx_i2c_acpi_ids[] = {
 583        {"BRCM9007", 0},
 584        {"CAV9007",  0},
 585        {}
 586};
 587MODULE_DEVICE_TABLE(acpi, xlp9xx_i2c_acpi_ids);
 588#endif
 589
 590static 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
 600module_platform_driver(xlp9xx_i2c_driver);
 601
 602MODULE_AUTHOR("Subhendu Sekhar Behera <sbehera@broadcom.com>");
 603MODULE_DESCRIPTION("XLP9XX/5XX I2C Bus Controller Driver");
 604MODULE_LICENSE("GPL v2");
 605