drivers/media/platform/marvell-ccic/cafe-driver.c

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This source file includes following definitions.
to_cam
cafe_smbus_write_done
cafe_smbus_write_data
cafe_smbus_read_done
cafe_smbus_read_data
cafe_smbus_xfer
cafe_smbus_enable_irq
cafe_smbus_func
cafe_smbus_setup
cafe_smbus_shutdown
cafe_ctlr_init
cafe_ctlr_power_up
cafe_ctlr_power_down
cafe_irq
cafe_pci_probe
cafe_shutdown
cafe_pci_remove
cafe_pci_suspend
cafe_pci_resume
cafe_init
cafe_exit
   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * A driver for the CMOS camera controller in the Marvell 88ALP01 "cafe"
   4  * multifunction chip.  Currently works with the Omnivision OV7670
   5  * sensor.
   6  *
   7  * The data sheet for this device can be found at:
   8  *    http://wiki.laptop.org/images/5/5c/88ALP01_Datasheet_July_2007.pdf
   9  *
  10  * Copyright 2006-11 One Laptop Per Child Association, Inc.
  11  * Copyright 2006-11 Jonathan Corbet <corbet@lwn.net>
  12  * Copyright 2018 Lubomir Rintel <lkundrak@v3.sk>
  13  *
  14  * Written by Jonathan Corbet, corbet@lwn.net.
  15  *
  16  * v4l2_device/v4l2_subdev conversion by:
  17  * Copyright (C) 2009 Hans Verkuil <hverkuil@xs4all.nl>
  18  */
  19 #include <linux/kernel.h>
  20 #include <linux/module.h>
  21 #include <linux/init.h>
  22 #include <linux/pci.h>
  23 #include <linux/i2c.h>
  24 #include <linux/interrupt.h>
  25 #include <linux/spinlock.h>
  26 #include <linux/slab.h>
  27 #include <linux/videodev2.h>
  28 #include <media/v4l2-device.h>
  29 #include <media/i2c/ov7670.h>
  30 #include <linux/device.h>
  31 #include <linux/wait.h>
  32 #include <linux/delay.h>
  33 #include <linux/io.h>
  34 #include <linux/clkdev.h>
  35 
  36 #include "mcam-core.h"
  37 
  38 #define CAFE_VERSION 0x000002
  39 
  40 
  41 /*
  42  * Parameters.
  43  */
  44 MODULE_AUTHOR("Jonathan Corbet <corbet@lwn.net>");
  45 MODULE_DESCRIPTION("Marvell 88ALP01 CMOS Camera Controller driver");
  46 MODULE_LICENSE("GPL");
  47 MODULE_SUPPORTED_DEVICE("Video");
  48 
  49 
  50 
  51 
  52 struct cafe_camera {
  53         int registered;                 /* Fully initialized? */
  54         struct mcam_camera mcam;
  55         struct pci_dev *pdev;
  56         struct i2c_adapter *i2c_adapter;
  57         wait_queue_head_t smbus_wait;   /* Waiting on i2c events */
  58 };
  59 
  60 /*
  61  * Most of the camera controller registers are defined in mcam-core.h,
  62  * but the Cafe platform has some additional registers of its own;
  63  * they are described here.
  64  */
  65 
  66 /*
  67  * "General purpose register" has a couple of GPIOs used for sensor
  68  * power and reset on OLPC XO 1.0 systems.
  69  */
  70 #define REG_GPR         0xb4
  71 #define   GPR_C1EN        0x00000020    /* Pad 1 (power down) enable */
  72 #define   GPR_C0EN        0x00000010    /* Pad 0 (reset) enable */
  73 #define   GPR_C1          0x00000002    /* Control 1 value */
  74 /*
  75  * Control 0 is wired to reset on OLPC machines.  For ov7x sensors,
  76  * it is active low.
  77  */
  78 #define   GPR_C0          0x00000001    /* Control 0 value */
  79 
  80 /*
  81  * These registers control the SMBUS module for communicating
  82  * with the sensor.
  83  */
  84 #define REG_TWSIC0      0xb8    /* TWSI (smbus) control 0 */
  85 #define   TWSIC0_EN       0x00000001    /* TWSI enable */
  86 #define   TWSIC0_MODE     0x00000002    /* 1 = 16-bit, 0 = 8-bit */
  87 #define   TWSIC0_SID      0x000003fc    /* Slave ID */
  88 /*
  89  * Subtle trickery: the slave ID field starts with bit 2.  But the
  90  * Linux i2c stack wants to treat the bottommost bit as a separate
  91  * read/write bit, which is why slave ID's are usually presented
  92  * >>1.  For consistency with that behavior, we shift over three
  93  * bits instead of two.
  94  */
  95 #define   TWSIC0_SID_SHIFT 3
  96 #define   TWSIC0_CLKDIV   0x0007fc00    /* Clock divider */
  97 #define   TWSIC0_MASKACK  0x00400000    /* Mask ack from sensor */
  98 #define   TWSIC0_OVMAGIC  0x00800000    /* Make it work on OV sensors */
  99 
 100 #define REG_TWSIC1      0xbc    /* TWSI control 1 */
 101 #define   TWSIC1_DATA     0x0000ffff    /* Data to/from camchip */
 102 #define   TWSIC1_ADDR     0x00ff0000    /* Address (register) */
 103 #define   TWSIC1_ADDR_SHIFT 16
 104 #define   TWSIC1_READ     0x01000000    /* Set for read op */
 105 #define   TWSIC1_WSTAT    0x02000000    /* Write status */
 106 #define   TWSIC1_RVALID   0x04000000    /* Read data valid */
 107 #define   TWSIC1_ERROR    0x08000000    /* Something screwed up */
 108 
 109 /*
 110  * Here's the weird global control registers
 111  */
 112 #define REG_GL_CSR     0x3004  /* Control/status register */
 113 #define   GCSR_SRS       0x00000001     /* SW Reset set */
 114 #define   GCSR_SRC       0x00000002     /* SW Reset clear */
 115 #define   GCSR_MRS       0x00000004     /* Master reset set */
 116 #define   GCSR_MRC       0x00000008     /* HW Reset clear */
 117 #define   GCSR_CCIC_EN   0x00004000    /* CCIC Clock enable */
 118 #define REG_GL_IMASK   0x300c  /* Interrupt mask register */
 119 #define   GIMSK_CCIC_EN          0x00000004    /* CCIC Interrupt enable */
 120 
 121 #define REG_GL_FCR      0x3038  /* GPIO functional control register */
 122 #define   GFCR_GPIO_ON    0x08          /* Camera GPIO enabled */
 123 #define REG_GL_GPIOR    0x315c  /* GPIO register */
 124 #define   GGPIO_OUT             0x80000 /* GPIO output */
 125 #define   GGPIO_VAL             0x00008 /* Output pin value */
 126 
 127 #define REG_LEN                (REG_GL_IMASK + 4)
 128 
 129 
 130 /*
 131  * Debugging and related.
 132  */
 133 #define cam_err(cam, fmt, arg...) \
 134         dev_err(&(cam)->pdev->dev, fmt, ##arg);
 135 #define cam_warn(cam, fmt, arg...) \
 136         dev_warn(&(cam)->pdev->dev, fmt, ##arg);
 137 
 138 /* -------------------------------------------------------------------- */
 139 /*
 140  * The I2C/SMBUS interface to the camera itself starts here.  The
 141  * controller handles SMBUS itself, presenting a relatively simple register
 142  * interface; all we have to do is to tell it where to route the data.
 143  */
 144 #define CAFE_SMBUS_TIMEOUT (HZ)  /* generous */
 145 
 146 static inline struct cafe_camera *to_cam(struct v4l2_device *dev)
 147 {
 148         struct mcam_camera *m = container_of(dev, struct mcam_camera, v4l2_dev);
 149         return container_of(m, struct cafe_camera, mcam);
 150 }
 151 
 152 
 153 static int cafe_smbus_write_done(struct mcam_camera *mcam)
 154 {
 155         unsigned long flags;
 156         int c1;
 157 
 158         /*
 159          * We must delay after the interrupt, or the controller gets confused
 160          * and never does give us good status.  Fortunately, we don't do this
 161          * often.
 162          */
 163         udelay(20);
 164         spin_lock_irqsave(&mcam->dev_lock, flags);
 165         c1 = mcam_reg_read(mcam, REG_TWSIC1);
 166         spin_unlock_irqrestore(&mcam->dev_lock, flags);
 167         return (c1 & (TWSIC1_WSTAT|TWSIC1_ERROR)) != TWSIC1_WSTAT;
 168 }
 169 
 170 static int cafe_smbus_write_data(struct cafe_camera *cam,
 171                 u16 addr, u8 command, u8 value)
 172 {
 173         unsigned int rval;
 174         unsigned long flags;
 175         struct mcam_camera *mcam = &cam->mcam;
 176 
 177         spin_lock_irqsave(&mcam->dev_lock, flags);
 178         rval = TWSIC0_EN | ((addr << TWSIC0_SID_SHIFT) & TWSIC0_SID);
 179         rval |= TWSIC0_OVMAGIC;  /* Make OV sensors work */
 180         /*
 181          * Marvell sez set clkdiv to all 1's for now.
 182          */
 183         rval |= TWSIC0_CLKDIV;
 184         mcam_reg_write(mcam, REG_TWSIC0, rval);
 185         (void) mcam_reg_read(mcam, REG_TWSIC1); /* force write */
 186         rval = value | ((command << TWSIC1_ADDR_SHIFT) & TWSIC1_ADDR);
 187         mcam_reg_write(mcam, REG_TWSIC1, rval);
 188         spin_unlock_irqrestore(&mcam->dev_lock, flags);
 189 
 190         /* Unfortunately, reading TWSIC1 too soon after sending a command
 191          * causes the device to die.
 192          * Use a busy-wait because we often send a large quantity of small
 193          * commands at-once; using msleep() would cause a lot of context
 194          * switches which take longer than 2ms, resulting in a noticeable
 195          * boot-time and capture-start delays.
 196          */
 197         mdelay(2);
 198 
 199         /*
 200          * Another sad fact is that sometimes, commands silently complete but
 201          * cafe_smbus_write_done() never becomes aware of this.
 202          * This happens at random and appears to possible occur with any
 203          * command.
 204          * We don't understand why this is. We work around this issue
 205          * with the timeout in the wait below, assuming that all commands
 206          * complete within the timeout.
 207          */
 208         wait_event_timeout(cam->smbus_wait, cafe_smbus_write_done(mcam),
 209                         CAFE_SMBUS_TIMEOUT);
 210 
 211         spin_lock_irqsave(&mcam->dev_lock, flags);
 212         rval = mcam_reg_read(mcam, REG_TWSIC1);
 213         spin_unlock_irqrestore(&mcam->dev_lock, flags);
 214 
 215         if (rval & TWSIC1_WSTAT) {
 216                 cam_err(cam, "SMBUS write (%02x/%02x/%02x) timed out\n", addr,
 217                                 command, value);
 218                 return -EIO;
 219         }
 220         if (rval & TWSIC1_ERROR) {
 221                 cam_err(cam, "SMBUS write (%02x/%02x/%02x) error\n", addr,
 222                                 command, value);
 223                 return -EIO;
 224         }
 225         return 0;
 226 }
 227 
 228 
 229 
 230 static int cafe_smbus_read_done(struct mcam_camera *mcam)
 231 {
 232         unsigned long flags;
 233         int c1;
 234 
 235         /*
 236          * We must delay after the interrupt, or the controller gets confused
 237          * and never does give us good status.  Fortunately, we don't do this
 238          * often.
 239          */
 240         udelay(20);
 241         spin_lock_irqsave(&mcam->dev_lock, flags);
 242         c1 = mcam_reg_read(mcam, REG_TWSIC1);
 243         spin_unlock_irqrestore(&mcam->dev_lock, flags);
 244         return c1 & (TWSIC1_RVALID|TWSIC1_ERROR);
 245 }
 246 
 247 
 248 
 249 static int cafe_smbus_read_data(struct cafe_camera *cam,
 250                 u16 addr, u8 command, u8 *value)
 251 {
 252         unsigned int rval;
 253         unsigned long flags;
 254         struct mcam_camera *mcam = &cam->mcam;
 255 
 256         spin_lock_irqsave(&mcam->dev_lock, flags);
 257         rval = TWSIC0_EN | ((addr << TWSIC0_SID_SHIFT) & TWSIC0_SID);
 258         rval |= TWSIC0_OVMAGIC; /* Make OV sensors work */
 259         /*
 260          * Marvel sez set clkdiv to all 1's for now.
 261          */
 262         rval |= TWSIC0_CLKDIV;
 263         mcam_reg_write(mcam, REG_TWSIC0, rval);
 264         (void) mcam_reg_read(mcam, REG_TWSIC1); /* force write */
 265         rval = TWSIC1_READ | ((command << TWSIC1_ADDR_SHIFT) & TWSIC1_ADDR);
 266         mcam_reg_write(mcam, REG_TWSIC1, rval);
 267         spin_unlock_irqrestore(&mcam->dev_lock, flags);
 268 
 269         wait_event_timeout(cam->smbus_wait,
 270                         cafe_smbus_read_done(mcam), CAFE_SMBUS_TIMEOUT);
 271         spin_lock_irqsave(&mcam->dev_lock, flags);
 272         rval = mcam_reg_read(mcam, REG_TWSIC1);
 273         spin_unlock_irqrestore(&mcam->dev_lock, flags);
 274 
 275         if (rval & TWSIC1_ERROR) {
 276                 cam_err(cam, "SMBUS read (%02x/%02x) error\n", addr, command);
 277                 return -EIO;
 278         }
 279         if (!(rval & TWSIC1_RVALID)) {
 280                 cam_err(cam, "SMBUS read (%02x/%02x) timed out\n", addr,
 281                                 command);
 282                 return -EIO;
 283         }
 284         *value = rval & 0xff;
 285         return 0;
 286 }
 287 
 288 /*
 289  * Perform a transfer over SMBUS.  This thing is called under
 290  * the i2c bus lock, so we shouldn't race with ourselves...
 291  */
 292 static int cafe_smbus_xfer(struct i2c_adapter *adapter, u16 addr,
 293                 unsigned short flags, char rw, u8 command,
 294                 int size, union i2c_smbus_data *data)
 295 {
 296         struct cafe_camera *cam = i2c_get_adapdata(adapter);
 297         int ret = -EINVAL;
 298 
 299         /*
 300          * This interface would appear to only do byte data ops.  OK
 301          * it can do word too, but the cam chip has no use for that.
 302          */
 303         if (size != I2C_SMBUS_BYTE_DATA) {
 304                 cam_err(cam, "funky xfer size %d\n", size);
 305                 return -EINVAL;
 306         }
 307 
 308         if (rw == I2C_SMBUS_WRITE)
 309                 ret = cafe_smbus_write_data(cam, addr, command, data->byte);
 310         else if (rw == I2C_SMBUS_READ)
 311                 ret = cafe_smbus_read_data(cam, addr, command, &data->byte);
 312         return ret;
 313 }
 314 
 315 
 316 static void cafe_smbus_enable_irq(struct cafe_camera *cam)
 317 {
 318         unsigned long flags;
 319 
 320         spin_lock_irqsave(&cam->mcam.dev_lock, flags);
 321         mcam_reg_set_bit(&cam->mcam, REG_IRQMASK, TWSIIRQS);
 322         spin_unlock_irqrestore(&cam->mcam.dev_lock, flags);
 323 }
 324 
 325 static u32 cafe_smbus_func(struct i2c_adapter *adapter)
 326 {
 327         return I2C_FUNC_SMBUS_READ_BYTE_DATA  |
 328                I2C_FUNC_SMBUS_WRITE_BYTE_DATA;
 329 }
 330 
 331 static const struct i2c_algorithm cafe_smbus_algo = {
 332         .smbus_xfer = cafe_smbus_xfer,
 333         .functionality = cafe_smbus_func
 334 };
 335 
 336 static int cafe_smbus_setup(struct cafe_camera *cam)
 337 {
 338         struct i2c_adapter *adap;
 339         int ret;
 340 
 341         adap = kzalloc(sizeof(*adap), GFP_KERNEL);
 342         if (adap == NULL)
 343                 return -ENOMEM;
 344         adap->owner = THIS_MODULE;
 345         adap->algo = &cafe_smbus_algo;
 346         strscpy(adap->name, "cafe_ccic", sizeof(adap->name));
 347         adap->dev.parent = &cam->pdev->dev;
 348         i2c_set_adapdata(adap, cam);
 349         ret = i2c_add_adapter(adap);
 350         if (ret) {
 351                 printk(KERN_ERR "Unable to register cafe i2c adapter\n");
 352                 kfree(adap);
 353                 return ret;
 354         }
 355 
 356         cam->i2c_adapter = adap;
 357         cafe_smbus_enable_irq(cam);
 358         return 0;
 359 }
 360 
 361 static void cafe_smbus_shutdown(struct cafe_camera *cam)
 362 {
 363         i2c_del_adapter(cam->i2c_adapter);
 364         kfree(cam->i2c_adapter);
 365 }
 366 
 367 
 368 /*
 369  * Controller-level stuff
 370  */
 371 
 372 static void cafe_ctlr_init(struct mcam_camera *mcam)
 373 {
 374         unsigned long flags;
 375 
 376         spin_lock_irqsave(&mcam->dev_lock, flags);
 377         /*
 378          * Added magic to bring up the hardware on the B-Test board
 379          */
 380         mcam_reg_write(mcam, 0x3038, 0x8);
 381         mcam_reg_write(mcam, 0x315c, 0x80008);
 382         /*
 383          * Go through the dance needed to wake the device up.
 384          * Note that these registers are global and shared
 385          * with the NAND and SD devices.  Interaction between the
 386          * three still needs to be examined.
 387          */
 388         mcam_reg_write(mcam, REG_GL_CSR, GCSR_SRS|GCSR_MRS); /* Needed? */
 389         mcam_reg_write(mcam, REG_GL_CSR, GCSR_SRC|GCSR_MRC);
 390         mcam_reg_write(mcam, REG_GL_CSR, GCSR_SRC|GCSR_MRS);
 391         /*
 392          * Here we must wait a bit for the controller to come around.
 393          */
 394         spin_unlock_irqrestore(&mcam->dev_lock, flags);
 395         msleep(5);
 396         spin_lock_irqsave(&mcam->dev_lock, flags);
 397 
 398         mcam_reg_write(mcam, REG_GL_CSR, GCSR_CCIC_EN|GCSR_SRC|GCSR_MRC);
 399         mcam_reg_set_bit(mcam, REG_GL_IMASK, GIMSK_CCIC_EN);
 400         /*
 401          * Mask all interrupts.
 402          */
 403         mcam_reg_write(mcam, REG_IRQMASK, 0);
 404         spin_unlock_irqrestore(&mcam->dev_lock, flags);
 405 }
 406 
 407 
 408 static int cafe_ctlr_power_up(struct mcam_camera *mcam)
 409 {
 410         /*
 411          * Part one of the sensor dance: turn the global
 412          * GPIO signal on.
 413          */
 414         mcam_reg_write(mcam, REG_GL_FCR, GFCR_GPIO_ON);
 415         mcam_reg_write(mcam, REG_GL_GPIOR, GGPIO_OUT|GGPIO_VAL);
 416         /*
 417          * Put the sensor into operational mode (assumes OLPC-style
 418          * wiring).  Control 0 is reset - set to 1 to operate.
 419          * Control 1 is power down, set to 0 to operate.
 420          */
 421         mcam_reg_write(mcam, REG_GPR, GPR_C1EN|GPR_C0EN); /* pwr up, reset */
 422         mcam_reg_write(mcam, REG_GPR, GPR_C1EN|GPR_C0EN|GPR_C0);
 423 
 424         return 0;
 425 }
 426 
 427 static void cafe_ctlr_power_down(struct mcam_camera *mcam)
 428 {
 429         mcam_reg_write(mcam, REG_GPR, GPR_C1EN|GPR_C0EN|GPR_C1);
 430         mcam_reg_write(mcam, REG_GL_FCR, GFCR_GPIO_ON);
 431         mcam_reg_write(mcam, REG_GL_GPIOR, GGPIO_OUT);
 432 }
 433 
 434 
 435 
 436 /*
 437  * The platform interrupt handler.
 438  */
 439 static irqreturn_t cafe_irq(int irq, void *data)
 440 {
 441         struct cafe_camera *cam = data;
 442         struct mcam_camera *mcam = &cam->mcam;
 443         unsigned int irqs, handled;
 444 
 445         spin_lock(&mcam->dev_lock);
 446         irqs = mcam_reg_read(mcam, REG_IRQSTAT);
 447         handled = cam->registered && mccic_irq(mcam, irqs);
 448         if (irqs & TWSIIRQS) {
 449                 mcam_reg_write(mcam, REG_IRQSTAT, TWSIIRQS);
 450                 wake_up(&cam->smbus_wait);
 451                 handled = 1;
 452         }
 453         spin_unlock(&mcam->dev_lock);
 454         return IRQ_RETVAL(handled);
 455 }
 456 
 457 /* -------------------------------------------------------------------------- */
 458 
 459 static struct ov7670_config sensor_cfg = {
 460         /*
 461          * Exclude QCIF mode, because it only captures a tiny portion
 462          * of the sensor FOV
 463          */
 464         .min_width = 320,
 465         .min_height = 240,
 466 
 467         /*
 468          * Set the clock speed for the XO 1; I don't believe this
 469          * driver has ever run anywhere else.
 470          */
 471         .clock_speed = 45,
 472         .use_smbus = 1,
 473 };
 474 
 475 static struct i2c_board_info ov7670_info = {
 476         .type = "ov7670",
 477         .addr = 0x42 >> 1,
 478         .platform_data = &sensor_cfg,
 479 };
 480 
 481 /* -------------------------------------------------------------------------- */
 482 /*
 483  * PCI interface stuff.
 484  */
 485 
 486 static int cafe_pci_probe(struct pci_dev *pdev,
 487                 const struct pci_device_id *id)
 488 {
 489         int ret;
 490         struct cafe_camera *cam;
 491         struct mcam_camera *mcam;
 492 
 493         /*
 494          * Start putting together one of our big camera structures.
 495          */
 496         ret = -ENOMEM;
 497         cam = kzalloc(sizeof(struct cafe_camera), GFP_KERNEL);
 498         if (cam == NULL)
 499                 goto out;
 500         cam->pdev = pdev;
 501         mcam = &cam->mcam;
 502         mcam->chip_id = MCAM_CAFE;
 503         spin_lock_init(&mcam->dev_lock);
 504         init_waitqueue_head(&cam->smbus_wait);
 505         mcam->plat_power_up = cafe_ctlr_power_up;
 506         mcam->plat_power_down = cafe_ctlr_power_down;
 507         mcam->dev = &pdev->dev;
 508         snprintf(mcam->bus_info, sizeof(mcam->bus_info), "PCI:%s", pci_name(pdev));
 509         /*
 510          * Vmalloc mode for buffers is traditional with this driver.
 511          * We *might* be able to run DMA_contig, especially on a system
 512          * with CMA in it.
 513          */
 514         mcam->buffer_mode = B_vmalloc;
 515         /*
 516          * Get set up on the PCI bus.
 517          */
 518         ret = pci_enable_device(pdev);
 519         if (ret)
 520                 goto out_free;
 521         pci_set_master(pdev);
 522 
 523         ret = -EIO;
 524         mcam->regs = pci_iomap(pdev, 0, 0);
 525         if (!mcam->regs) {
 526                 printk(KERN_ERR "Unable to ioremap cafe-ccic regs\n");
 527                 goto out_disable;
 528         }
 529         mcam->regs_size = pci_resource_len(pdev, 0);
 530         ret = request_irq(pdev->irq, cafe_irq, IRQF_SHARED, "cafe-ccic", cam);
 531         if (ret)
 532                 goto out_iounmap;
 533 
 534         /*
 535          * Initialize the controller.
 536          */
 537         cafe_ctlr_init(mcam);
 538 
 539         /*
 540          * Set up I2C/SMBUS communications.  We have to drop the mutex here
 541          * because the sensor could attach in this call chain, leading to
 542          * unsightly deadlocks.
 543          */
 544         ret = cafe_smbus_setup(cam);
 545         if (ret)
 546                 goto out_pdown;
 547 
 548         mcam->asd.match_type = V4L2_ASYNC_MATCH_I2C;
 549         mcam->asd.match.i2c.adapter_id = i2c_adapter_id(cam->i2c_adapter);
 550         mcam->asd.match.i2c.address = ov7670_info.addr;
 551 
 552         ret = mccic_register(mcam);
 553         if (ret)
 554                 goto out_smbus_shutdown;
 555 
 556         clkdev_create(mcam->mclk, "xclk", "%d-%04x",
 557                 i2c_adapter_id(cam->i2c_adapter), ov7670_info.addr);
 558 
 559         if (i2c_new_device(cam->i2c_adapter, &ov7670_info)) {
 560                 cam->registered = 1;
 561                 return 0;
 562         }
 563 
 564         mccic_shutdown(mcam);
 565 out_smbus_shutdown:
 566         cafe_smbus_shutdown(cam);
 567 out_pdown:
 568         cafe_ctlr_power_down(mcam);
 569         free_irq(pdev->irq, cam);
 570 out_iounmap:
 571         pci_iounmap(pdev, mcam->regs);
 572 out_disable:
 573         pci_disable_device(pdev);
 574 out_free:
 575         kfree(cam);
 576 out:
 577         return ret;
 578 }
 579 
 580 
 581 /*
 582  * Shut down an initialized device
 583  */
 584 static void cafe_shutdown(struct cafe_camera *cam)
 585 {
 586         mccic_shutdown(&cam->mcam);
 587         cafe_smbus_shutdown(cam);
 588         free_irq(cam->pdev->irq, cam);
 589         pci_iounmap(cam->pdev, cam->mcam.regs);
 590 }
 591 
 592 
 593 static void cafe_pci_remove(struct pci_dev *pdev)
 594 {
 595         struct v4l2_device *v4l2_dev = dev_get_drvdata(&pdev->dev);
 596         struct cafe_camera *cam = to_cam(v4l2_dev);
 597 
 598         if (cam == NULL) {
 599                 printk(KERN_WARNING "pci_remove on unknown pdev %p\n", pdev);
 600                 return;
 601         }
 602         cafe_shutdown(cam);
 603         kfree(cam);
 604 }
 605 
 606 
 607 #ifdef CONFIG_PM
 608 /*
 609  * Basic power management.
 610  */
 611 static int cafe_pci_suspend(struct pci_dev *pdev, pm_message_t state)
 612 {
 613         struct v4l2_device *v4l2_dev = dev_get_drvdata(&pdev->dev);
 614         struct cafe_camera *cam = to_cam(v4l2_dev);
 615         int ret;
 616 
 617         ret = pci_save_state(pdev);
 618         if (ret)
 619                 return ret;
 620         mccic_suspend(&cam->mcam);
 621         pci_disable_device(pdev);
 622         return 0;
 623 }
 624 
 625 
 626 static int cafe_pci_resume(struct pci_dev *pdev)
 627 {
 628         struct v4l2_device *v4l2_dev = dev_get_drvdata(&pdev->dev);
 629         struct cafe_camera *cam = to_cam(v4l2_dev);
 630         int ret = 0;
 631 
 632         pci_restore_state(pdev);
 633         ret = pci_enable_device(pdev);
 634 
 635         if (ret) {
 636                 cam_warn(cam, "Unable to re-enable device on resume!\n");
 637                 return ret;
 638         }
 639         cafe_ctlr_init(&cam->mcam);
 640         return mccic_resume(&cam->mcam);
 641 }
 642 
 643 #endif  /* CONFIG_PM */
 644 
 645 static const struct pci_device_id cafe_ids[] = {
 646         { PCI_DEVICE(PCI_VENDOR_ID_MARVELL,
 647                      PCI_DEVICE_ID_MARVELL_88ALP01_CCIC) },
 648         { 0, }
 649 };
 650 
 651 MODULE_DEVICE_TABLE(pci, cafe_ids);
 652 
 653 static struct pci_driver cafe_pci_driver = {
 654         .name = "cafe1000-ccic",
 655         .id_table = cafe_ids,
 656         .probe = cafe_pci_probe,
 657         .remove = cafe_pci_remove,
 658 #ifdef CONFIG_PM
 659         .suspend = cafe_pci_suspend,
 660         .resume = cafe_pci_resume,
 661 #endif
 662 };
 663 
 664 
 665 
 666 
 667 static int __init cafe_init(void)
 668 {
 669         int ret;
 670 
 671         printk(KERN_NOTICE "Marvell M88ALP01 'CAFE' Camera Controller version %d\n",
 672                         CAFE_VERSION);
 673         ret = pci_register_driver(&cafe_pci_driver);
 674         if (ret) {
 675                 printk(KERN_ERR "Unable to register cafe_ccic driver\n");
 676                 goto out;
 677         }
 678         ret = 0;
 679 
 680 out:
 681         return ret;
 682 }
 683 
 684 
 685 static void __exit cafe_exit(void)
 686 {
 687         pci_unregister_driver(&cafe_pci_driver);
 688 }
 689 
 690 module_init(cafe_init);
 691 module_exit(cafe_exit);
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/media/platform/marvell-ccic/cafe-driver.c

DEFINITIONS
