1 /* 2 * Copyright (C) 2014 Broadcom Corporation 3 * 4 * This program is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU General Public License as 6 * published by the Free Software Foundation version 2. 7 * 8 * This program is distributed "as is" WITHOUT ANY WARRANTY of any 9 * kind, whether express or implied; without even the implied warranty 10 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 11 * GNU General Public License for more details. 12 */ 13 14 #include <linux/clk.h> 15 #include <linux/delay.h> 16 #include <linux/device.h> 17 #include <linux/i2c.h> 18 #include <linux/interrupt.h> 19 #include <linux/io.h> 20 #include <linux/kernel.h> 21 #include <linux/module.h> 22 #include <linux/platform_device.h> 23 #include <linux/sched.h> 24 #include <linux/slab.h> 25 #include <linux/version.h> 26 27 #define N_DATA_REGS 8 28 #define N_DATA_BYTES (N_DATA_REGS * 4) 29 30 /* BSC count register field definitions */ 31 #define BSC_CNT_REG1_MASK 0x0000003f 32 #define BSC_CNT_REG1_SHIFT 0 33 #define BSC_CNT_REG2_MASK 0x00000fc0 34 #define BSC_CNT_REG2_SHIFT 6 35 36 /* BSC CTL register field definitions */ 37 #define BSC_CTL_REG_DTF_MASK 0x00000003 38 #define BSC_CTL_REG_SCL_SEL_MASK 0x00000030 39 #define BSC_CTL_REG_SCL_SEL_SHIFT 4 40 #define BSC_CTL_REG_INT_EN_MASK 0x00000040 41 #define BSC_CTL_REG_INT_EN_SHIFT 6 42 #define BSC_CTL_REG_DIV_CLK_MASK 0x00000080 43 44 /* BSC_IIC_ENABLE r/w enable and interrupt field defintions */ 45 #define BSC_IIC_EN_RESTART_MASK 0x00000040 46 #define BSC_IIC_EN_NOSTART_MASK 0x00000020 47 #define BSC_IIC_EN_NOSTOP_MASK 0x00000010 48 #define BSC_IIC_EN_NOACK_MASK 0x00000004 49 #define BSC_IIC_EN_INTRP_MASK 0x00000002 50 #define BSC_IIC_EN_ENABLE_MASK 0x00000001 51 52 /* BSC_CTLHI control register field definitions */ 53 #define BSC_CTLHI_REG_INPUT_SWITCHING_LEVEL_MASK 0x00000080 54 #define BSC_CTLHI_REG_DATAREG_SIZE_MASK 0x00000040 55 #define BSC_CTLHI_REG_IGNORE_ACK_MASK 0x00000002 56 #define BSC_CTLHI_REG_WAIT_DIS_MASK 0x00000001 57 58 #define I2C_TIMEOUT 100 /* msecs */ 59 60 /* Condition mask used for non combined transfer */ 61 #define COND_RESTART BSC_IIC_EN_RESTART_MASK 62 #define COND_NOSTART BSC_IIC_EN_NOSTART_MASK 63 #define COND_NOSTOP BSC_IIC_EN_NOSTOP_MASK 64 #define COND_START_STOP (COND_RESTART | COND_NOSTART | COND_NOSTOP) 65 66 /* BSC data transfer direction */ 67 #define DTF_WR_MASK 0x00000000 68 #define DTF_RD_MASK 0x00000001 69 /* BSC data transfer direction combined format */ 70 #define DTF_RD_WR_MASK 0x00000002 71 #define DTF_WR_RD_MASK 0x00000003 72 73 #define INT_ENABLE true 74 #define INT_DISABLE false 75 76 /* BSC block register map structure to cache fields to be written */ 77 struct bsc_regs { 78 u32 chip_address; /* slave address */ 79 u32 data_in[N_DATA_REGS]; /* tx data buffer*/ 80 u32 cnt_reg; /* rx/tx data length */ 81 u32 ctl_reg; /* control register */ 82 u32 iic_enable; /* xfer enable and status */ 83 u32 data_out[N_DATA_REGS]; /* rx data buffer */ 84 u32 ctlhi_reg; /* more control fields */ 85 u32 scl_param; /* reserved */ 86 }; 87 88 struct bsc_clk_param { 89 u32 hz; 90 u32 scl_mask; 91 u32 div_mask; 92 }; 93 94 enum bsc_xfer_cmd { 95 CMD_WR, 96 CMD_RD, 97 CMD_WR_NOACK, 98 CMD_RD_NOACK, 99 }; 100 101 static char const *cmd_string[] = { 102 [CMD_WR] = "WR", 103 [CMD_RD] = "RD", 104 [CMD_WR_NOACK] = "WR NOACK", 105 [CMD_RD_NOACK] = "RD NOACK", 106 }; 107 108 enum bus_speeds { 109 SPD_375K, 110 SPD_390K, 111 SPD_187K, 112 SPD_200K, 113 SPD_93K, 114 SPD_97K, 115 SPD_46K, 116 SPD_50K 117 }; 118 119 static const struct bsc_clk_param bsc_clk[] = { 120 [SPD_375K] = { 121 .hz = 375000, 122 .scl_mask = SPD_375K << BSC_CTL_REG_SCL_SEL_SHIFT, 123 .div_mask = 0 124 }, 125 [SPD_390K] = { 126 .hz = 390000, 127 .scl_mask = SPD_390K << BSC_CTL_REG_SCL_SEL_SHIFT, 128 .div_mask = 0 129 }, 130 [SPD_187K] = { 131 .hz = 187500, 132 .scl_mask = SPD_187K << BSC_CTL_REG_SCL_SEL_SHIFT, 133 .div_mask = 0 134 }, 135 [SPD_200K] = { 136 .hz = 200000, 137 .scl_mask = SPD_200K << BSC_CTL_REG_SCL_SEL_SHIFT, 138 .div_mask = 0 139 }, 140 [SPD_93K] = { 141 .hz = 93750, 142 .scl_mask = SPD_375K << BSC_CTL_REG_SCL_SEL_SHIFT, 143 .div_mask = BSC_CTL_REG_DIV_CLK_MASK 144 }, 145 [SPD_97K] = { 146 .hz = 97500, 147 .scl_mask = SPD_390K << BSC_CTL_REG_SCL_SEL_SHIFT, 148 .div_mask = BSC_CTL_REG_DIV_CLK_MASK 149 }, 150 [SPD_46K] = { 151 .hz = 46875, 152 .scl_mask = SPD_187K << BSC_CTL_REG_SCL_SEL_SHIFT, 153 .div_mask = BSC_CTL_REG_DIV_CLK_MASK 154 }, 155 [SPD_50K] = { 156 .hz = 50000, 157 .scl_mask = SPD_200K << BSC_CTL_REG_SCL_SEL_SHIFT, 158 .div_mask = BSC_CTL_REG_DIV_CLK_MASK 159 } 160 }; 161 162 struct brcmstb_i2c_dev { 163 struct device *device; 164 void __iomem *base; 165 void __iomem *irq_base; 166 int irq; 167 struct bsc_regs *bsc_regmap; 168 struct i2c_adapter adapter; 169 struct completion done; 170 bool is_suspended; 171 u32 clk_freq_hz; 172 }; 173 174 /* register accessors for both be and le cpu arch */ 175 #ifdef CONFIG_CPU_BIG_ENDIAN 176 #define __bsc_readl(_reg) ioread32be(_reg) 177 #define __bsc_writel(_val, _reg) iowrite32be(_val, _reg) 178 #else 179 #define __bsc_readl(_reg) ioread32(_reg) 180 #define __bsc_writel(_val, _reg) iowrite32(_val, _reg) 181 #endif 182 183 #define bsc_readl(_dev, _reg) \ 184 __bsc_readl(_dev->base + offsetof(struct bsc_regs, _reg)) 185 186 #define bsc_writel(_dev, _val, _reg) \ 187 __bsc_writel(_val, _dev->base + offsetof(struct bsc_regs, _reg)) 188 189 static void brcmstb_i2c_enable_disable_irq(struct brcmstb_i2c_dev *dev, 190 bool int_en) 191 { 192 193 if (int_en) 194 /* Enable BSC CTL interrupt line */ 195 dev->bsc_regmap->ctl_reg |= BSC_CTL_REG_INT_EN_MASK; 196 else 197 /* Disable BSC CTL interrupt line */ 198 dev->bsc_regmap->ctl_reg &= ~BSC_CTL_REG_INT_EN_MASK; 199 200 barrier(); 201 bsc_writel(dev, dev->bsc_regmap->ctl_reg, ctl_reg); 202 } 203 204 static irqreturn_t brcmstb_i2c_isr(int irq, void *devid) 205 { 206 struct brcmstb_i2c_dev *dev = devid; 207 u32 status_bsc_ctl = bsc_readl(dev, ctl_reg); 208 u32 status_iic_intrp = bsc_readl(dev, iic_enable); 209 210 dev_dbg(dev->device, "isr CTL_REG %x IIC_EN %x\n", 211 status_bsc_ctl, status_iic_intrp); 212 213 if (!(status_bsc_ctl & BSC_CTL_REG_INT_EN_MASK)) 214 return IRQ_NONE; 215 216 brcmstb_i2c_enable_disable_irq(dev, INT_DISABLE); 217 complete_all(&dev->done); 218 219 dev_dbg(dev->device, "isr handled"); 220 return IRQ_HANDLED; 221 } 222 223 /* Wait for device to be ready */ 224 static int brcmstb_i2c_wait_if_busy(struct brcmstb_i2c_dev *dev) 225 { 226 unsigned long timeout = jiffies + msecs_to_jiffies(I2C_TIMEOUT); 227 228 while ((bsc_readl(dev, iic_enable) & BSC_IIC_EN_INTRP_MASK)) { 229 if (time_after(jiffies, timeout)) 230 return -ETIMEDOUT; 231 cpu_relax(); 232 } 233 return 0; 234 } 235 236 /* i2c xfer completion function, handles both irq and polling mode */ 237 static int brcmstb_i2c_wait_for_completion(struct brcmstb_i2c_dev *dev) 238 { 239 int ret = 0; 240 unsigned long timeout = msecs_to_jiffies(I2C_TIMEOUT); 241 242 if (dev->irq >= 0) { 243 if (!wait_for_completion_timeout(&dev->done, timeout)) 244 ret = -ETIMEDOUT; 245 } else { 246 /* we are in polling mode */ 247 u32 bsc_intrp; 248 unsigned long time_left = jiffies + timeout; 249 250 do { 251 bsc_intrp = bsc_readl(dev, iic_enable) & 252 BSC_IIC_EN_INTRP_MASK; 253 if (time_after(jiffies, time_left)) { 254 ret = -ETIMEDOUT; 255 break; 256 } 257 cpu_relax(); 258 } while (!bsc_intrp); 259 } 260 261 if (dev->irq < 0 || ret == -ETIMEDOUT) 262 brcmstb_i2c_enable_disable_irq(dev, INT_DISABLE); 263 264 return ret; 265 } 266 267 /* Set xfer START/STOP conditions for subsequent transfer */ 268 static void brcmstb_set_i2c_start_stop(struct brcmstb_i2c_dev *dev, 269 u32 cond_flag) 270 { 271 u32 regval = dev->bsc_regmap->iic_enable; 272 273 dev->bsc_regmap->iic_enable = (regval & ~COND_START_STOP) | cond_flag; 274 } 275 276 /* Send I2C request check completion */ 277 static int brcmstb_send_i2c_cmd(struct brcmstb_i2c_dev *dev, 278 enum bsc_xfer_cmd cmd) 279 { 280 int rc = 0; 281 struct bsc_regs *pi2creg = dev->bsc_regmap; 282 283 /* Make sure the hardware is ready */ 284 rc = brcmstb_i2c_wait_if_busy(dev); 285 if (rc < 0) 286 return rc; 287 288 /* only if we are in interrupt mode */ 289 if (dev->irq >= 0) 290 reinit_completion(&dev->done); 291 292 /* enable BSC CTL interrupt line */ 293 brcmstb_i2c_enable_disable_irq(dev, INT_ENABLE); 294 295 /* initiate transfer by setting iic_enable */ 296 pi2creg->iic_enable |= BSC_IIC_EN_ENABLE_MASK; 297 bsc_writel(dev, pi2creg->iic_enable, iic_enable); 298 299 /* Wait for transaction to finish or timeout */ 300 rc = brcmstb_i2c_wait_for_completion(dev); 301 if (rc) { 302 dev_dbg(dev->device, "intr timeout for cmd %s\n", 303 cmd_string[cmd]); 304 goto cmd_out; 305 } 306 307 if ((CMD_RD || CMD_WR) && 308 bsc_readl(dev, iic_enable) & BSC_IIC_EN_NOACK_MASK) { 309 rc = -EREMOTEIO; 310 dev_dbg(dev->device, "controller received NOACK intr for %s\n", 311 cmd_string[cmd]); 312 } 313 314 cmd_out: 315 bsc_writel(dev, 0, cnt_reg); 316 bsc_writel(dev, 0, iic_enable); 317 318 return rc; 319 } 320 321 /* Actual data transfer through the BSC master */ 322 static int brcmstb_i2c_xfer_bsc_data(struct brcmstb_i2c_dev *dev, 323 u8 *buf, unsigned int len, 324 struct i2c_msg *pmsg) 325 { 326 int cnt, byte, rc; 327 enum bsc_xfer_cmd cmd; 328 u32 ctl_reg; 329 struct bsc_regs *pi2creg = dev->bsc_regmap; 330 int no_ack = pmsg->flags & I2C_M_IGNORE_NAK; 331 332 /* see if the transaction needs to check NACK conditions */ 333 if (no_ack || len <= N_DATA_BYTES) { 334 cmd = (pmsg->flags & I2C_M_RD) ? CMD_RD_NOACK 335 : CMD_WR_NOACK; 336 pi2creg->ctlhi_reg |= BSC_CTLHI_REG_IGNORE_ACK_MASK; 337 } else { 338 cmd = (pmsg->flags & I2C_M_RD) ? CMD_RD : CMD_WR; 339 pi2creg->ctlhi_reg &= ~BSC_CTLHI_REG_IGNORE_ACK_MASK; 340 } 341 bsc_writel(dev, pi2creg->ctlhi_reg, ctlhi_reg); 342 343 /* set data transfer direction */ 344 ctl_reg = pi2creg->ctl_reg & ~BSC_CTL_REG_DTF_MASK; 345 if (cmd == CMD_WR || cmd == CMD_WR_NOACK) 346 pi2creg->ctl_reg = ctl_reg | DTF_WR_MASK; 347 else 348 pi2creg->ctl_reg = ctl_reg | DTF_RD_MASK; 349 350 /* set the read/write length */ 351 bsc_writel(dev, BSC_CNT_REG1_MASK & (len << BSC_CNT_REG1_SHIFT), 352 cnt_reg); 353 354 /* Write data into data_in register */ 355 if (cmd == CMD_WR || cmd == CMD_WR_NOACK) { 356 for (cnt = 0; cnt < len; cnt += 4) { 357 u32 word = 0; 358 359 for (byte = 0; byte < 4; byte++) { 360 word >>= 8; 361 if ((cnt + byte) < len) 362 word |= buf[cnt + byte] << 24; 363 } 364 bsc_writel(dev, word, data_in[cnt >> 2]); 365 } 366 } 367 368 /* Initiate xfer, the function will return on completion */ 369 rc = brcmstb_send_i2c_cmd(dev, cmd); 370 371 if (rc != 0) { 372 dev_dbg(dev->device, "%s failure", cmd_string[cmd]); 373 return rc; 374 } 375 376 if (cmd == CMD_RD || cmd == CMD_RD_NOACK) { 377 for (cnt = 0; cnt < len; cnt += 4) { 378 u32 data = bsc_readl(dev, data_out[cnt >> 2]); 379 380 for (byte = 0; byte < 4 && 381 (byte + cnt) < len; byte++) { 382 buf[cnt + byte] = data & 0xff; 383 data >>= 8; 384 } 385 } 386 } 387 388 return 0; 389 } 390 391 /* Write a single byte of data to the i2c bus */ 392 static int brcmstb_i2c_write_data_byte(struct brcmstb_i2c_dev *dev, 393 u8 *buf, unsigned int nak_expected) 394 { 395 enum bsc_xfer_cmd cmd = nak_expected ? CMD_WR : CMD_WR_NOACK; 396 397 bsc_writel(dev, 1, cnt_reg); 398 bsc_writel(dev, *buf, data_in); 399 400 return brcmstb_send_i2c_cmd(dev, cmd); 401 } 402 403 /* Send i2c address */ 404 static int brcmstb_i2c_do_addr(struct brcmstb_i2c_dev *dev, 405 struct i2c_msg *msg) 406 { 407 unsigned char addr; 408 409 if (msg->flags & I2C_M_TEN) { 410 /* First byte is 11110XX0 where XX is upper 2 bits */ 411 addr = 0xF0 | ((msg->addr & 0x300) >> 7); 412 bsc_writel(dev, addr, chip_address); 413 414 /* Second byte is the remaining 8 bits */ 415 addr = msg->addr & 0xFF; 416 if (brcmstb_i2c_write_data_byte(dev, &addr, 0) < 0) 417 return -EREMOTEIO; 418 419 if (msg->flags & I2C_M_RD) { 420 /* For read, send restart without stop condition */ 421 brcmstb_set_i2c_start_stop(dev, COND_RESTART 422 | COND_NOSTOP); 423 /* Then re-send the first byte with the read bit set */ 424 addr = 0xF0 | ((msg->addr & 0x300) >> 7) | 0x01; 425 if (brcmstb_i2c_write_data_byte(dev, &addr, 0) < 0) 426 return -EREMOTEIO; 427 428 } 429 } else { 430 addr = msg->addr << 1; 431 if (msg->flags & I2C_M_RD) 432 addr |= 1; 433 434 bsc_writel(dev, addr, chip_address); 435 } 436 437 return 0; 438 } 439 440 /* Master transfer function */ 441 static int brcmstb_i2c_xfer(struct i2c_adapter *adapter, 442 struct i2c_msg msgs[], int num) 443 { 444 struct brcmstb_i2c_dev *dev = i2c_get_adapdata(adapter); 445 struct i2c_msg *pmsg; 446 int rc = 0; 447 int i; 448 int bytes_to_xfer; 449 u8 *tmp_buf; 450 int len = 0; 451 452 if (dev->is_suspended) 453 return -EBUSY; 454 455 /* Loop through all messages */ 456 for (i = 0; i < num; i++) { 457 pmsg = &msgs[i]; 458 len = pmsg->len; 459 tmp_buf = pmsg->buf; 460 461 dev_dbg(dev->device, 462 "msg# %d/%d flg %x buf %x len %d\n", i, 463 num - 1, pmsg->flags, 464 pmsg->buf ? pmsg->buf[0] : '0', pmsg->len); 465 466 if (i < (num - 1) && (msgs[i + 1].flags & I2C_M_NOSTART)) 467 brcmstb_set_i2c_start_stop(dev, ~(COND_START_STOP)); 468 else 469 brcmstb_set_i2c_start_stop(dev, 470 COND_RESTART | COND_NOSTOP); 471 472 /* Send slave address */ 473 if (!(pmsg->flags & I2C_M_NOSTART)) { 474 rc = brcmstb_i2c_do_addr(dev, pmsg); 475 if (rc < 0) { 476 dev_dbg(dev->device, 477 "NACK for addr %2.2x msg#%d rc = %d\n", 478 pmsg->addr, i, rc); 479 goto out; 480 } 481 } 482 483 /* Perform data transfer */ 484 while (len) { 485 bytes_to_xfer = min(len, N_DATA_BYTES); 486 487 if (len <= N_DATA_BYTES && i == (num - 1)) 488 brcmstb_set_i2c_start_stop(dev, 489 ~(COND_START_STOP)); 490 491 rc = brcmstb_i2c_xfer_bsc_data(dev, tmp_buf, 492 bytes_to_xfer, pmsg); 493 if (rc < 0) 494 goto out; 495 496 len -= bytes_to_xfer; 497 tmp_buf += bytes_to_xfer; 498 } 499 } 500 501 rc = num; 502 out: 503 return rc; 504 505 } 506 507 static u32 brcmstb_i2c_functionality(struct i2c_adapter *adap) 508 { 509 return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL | I2C_FUNC_10BIT_ADDR 510 | I2C_FUNC_NOSTART | I2C_FUNC_PROTOCOL_MANGLING; 511 } 512 513 static const struct i2c_algorithm brcmstb_i2c_algo = { 514 .master_xfer = brcmstb_i2c_xfer, 515 .functionality = brcmstb_i2c_functionality, 516 }; 517 518 static void brcmstb_i2c_set_bus_speed(struct brcmstb_i2c_dev *dev) 519 { 520 int i = 0, num_speeds = ARRAY_SIZE(bsc_clk); 521 u32 clk_freq_hz = dev->clk_freq_hz; 522 523 for (i = 0; i < num_speeds; i++) { 524 if (bsc_clk[i].hz == clk_freq_hz) { 525 dev->bsc_regmap->ctl_reg &= ~(BSC_CTL_REG_SCL_SEL_MASK 526 | BSC_CTL_REG_DIV_CLK_MASK); 527 dev->bsc_regmap->ctl_reg |= (bsc_clk[i].scl_mask | 528 bsc_clk[i].div_mask); 529 bsc_writel(dev, dev->bsc_regmap->ctl_reg, ctl_reg); 530 break; 531 } 532 } 533 534 /* in case we did not get find a valid speed */ 535 if (i == num_speeds) { 536 i = (bsc_readl(dev, ctl_reg) & BSC_CTL_REG_SCL_SEL_MASK) >> 537 BSC_CTL_REG_SCL_SEL_SHIFT; 538 dev_warn(dev->device, "leaving current clock-frequency @ %dHz\n", 539 bsc_clk[i].hz); 540 } 541 } 542 543 static void brcmstb_i2c_set_bsc_reg_defaults(struct brcmstb_i2c_dev *dev) 544 { 545 /* 4 byte data register */ 546 dev->bsc_regmap->ctlhi_reg = BSC_CTLHI_REG_DATAREG_SIZE_MASK; 547 bsc_writel(dev, dev->bsc_regmap->ctlhi_reg, ctlhi_reg); 548 /* set bus speed */ 549 brcmstb_i2c_set_bus_speed(dev); 550 } 551 552 static int brcmstb_i2c_probe(struct platform_device *pdev) 553 { 554 int rc = 0; 555 struct brcmstb_i2c_dev *dev; 556 struct i2c_adapter *adap; 557 struct resource *iomem; 558 const char *int_name; 559 560 /* Allocate memory for private data structure */ 561 dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL); 562 if (!dev) 563 return -ENOMEM; 564 565 dev->bsc_regmap = devm_kzalloc(&pdev->dev, sizeof(struct bsc_regs *), 566 GFP_KERNEL); 567 if (!dev->bsc_regmap) 568 return -ENOMEM; 569 570 platform_set_drvdata(pdev, dev); 571 dev->device = &pdev->dev; 572 init_completion(&dev->done); 573 574 /* Map hardware registers */ 575 iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0); 576 dev->base = devm_ioremap_resource(dev->device, iomem); 577 if (IS_ERR(dev->base)) { 578 rc = -ENOMEM; 579 goto probe_errorout; 580 } 581 582 rc = of_property_read_string(dev->device->of_node, "interrupt-names", 583 &int_name); 584 if (rc < 0) 585 int_name = NULL; 586 587 /* Get the interrupt number */ 588 dev->irq = platform_get_irq(pdev, 0); 589 590 /* disable the bsc interrupt line */ 591 brcmstb_i2c_enable_disable_irq(dev, INT_DISABLE); 592 593 /* register the ISR handler */ 594 rc = devm_request_irq(&pdev->dev, dev->irq, brcmstb_i2c_isr, 595 IRQF_SHARED, 596 int_name ? int_name : pdev->name, 597 dev); 598 599 if (rc) { 600 dev_dbg(dev->device, "falling back to polling mode"); 601 dev->irq = -1; 602 } 603 604 if (of_property_read_u32(dev->device->of_node, 605 "clock-frequency", &dev->clk_freq_hz)) { 606 dev_warn(dev->device, "setting clock-frequency@%dHz\n", 607 bsc_clk[0].hz); 608 dev->clk_freq_hz = bsc_clk[0].hz; 609 } 610 611 brcmstb_i2c_set_bsc_reg_defaults(dev); 612 613 /* Add the i2c adapter */ 614 adap = &dev->adapter; 615 i2c_set_adapdata(adap, dev); 616 adap->owner = THIS_MODULE; 617 strlcpy(adap->name, "Broadcom STB : ", sizeof(adap->name)); 618 if (int_name) 619 strlcat(adap->name, int_name, sizeof(adap->name)); 620 adap->algo = &brcmstb_i2c_algo; 621 adap->dev.parent = &pdev->dev; 622 adap->dev.of_node = pdev->dev.of_node; 623 rc = i2c_add_adapter(adap); 624 if (rc) { 625 dev_err(dev->device, "failed to add adapter\n"); 626 goto probe_errorout; 627 } 628 629 dev_info(dev->device, "%s@%dhz registered in %s mode\n", 630 int_name ? int_name : " ", dev->clk_freq_hz, 631 (dev->irq >= 0) ? "interrupt" : "polling"); 632 633 return 0; 634 635 probe_errorout: 636 return rc; 637 } 638 639 static int brcmstb_i2c_remove(struct platform_device *pdev) 640 { 641 struct brcmstb_i2c_dev *dev = platform_get_drvdata(pdev); 642 643 i2c_del_adapter(&dev->adapter); 644 return 0; 645 } 646 647 #ifdef CONFIG_PM_SLEEP 648 static int brcmstb_i2c_suspend(struct device *dev) 649 { 650 struct brcmstb_i2c_dev *i2c_dev = dev_get_drvdata(dev); 651 652 i2c_lock_adapter(&i2c_dev->adapter); 653 i2c_dev->is_suspended = true; 654 i2c_unlock_adapter(&i2c_dev->adapter); 655 656 return 0; 657 } 658 659 static int brcmstb_i2c_resume(struct device *dev) 660 { 661 struct brcmstb_i2c_dev *i2c_dev = dev_get_drvdata(dev); 662 663 i2c_lock_adapter(&i2c_dev->adapter); 664 brcmstb_i2c_set_bsc_reg_defaults(i2c_dev); 665 i2c_dev->is_suspended = false; 666 i2c_unlock_adapter(&i2c_dev->adapter); 667 668 return 0; 669 } 670 #endif 671 672 static SIMPLE_DEV_PM_OPS(brcmstb_i2c_pm, brcmstb_i2c_suspend, 673 brcmstb_i2c_resume); 674 675 static const struct of_device_id brcmstb_i2c_of_match[] = { 676 {.compatible = "brcm,brcmstb-i2c"}, 677 {}, 678 }; 679 MODULE_DEVICE_TABLE(of, brcmstb_i2c_of_match); 680 681 static struct platform_driver brcmstb_i2c_driver = { 682 .driver = { 683 .name = "brcmstb-i2c", 684 .of_match_table = brcmstb_i2c_of_match, 685 .pm = &brcmstb_i2c_pm, 686 }, 687 .probe = brcmstb_i2c_probe, 688 .remove = brcmstb_i2c_remove, 689 }; 690 module_platform_driver(brcmstb_i2c_driver); 691 692 MODULE_AUTHOR("Kamal Dasu <kdasu@broadcom.com>"); 693 MODULE_DESCRIPTION("Broadcom Settop I2C Driver"); 694 MODULE_LICENSE("GPL v2"); 695