Version:  2.0.40 2.2.26 2.4.37 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 4.10

Linux/drivers/media/platform/via-camera.c

  1 /*
  2  * Driver for the VIA Chrome integrated camera controller.
  3  *
  4  * Copyright 2009,2010 Jonathan Corbet <corbet@lwn.net>
  5  * Distributable under the terms of the GNU General Public License, version 2
  6  *
  7  * This work was supported by the One Laptop Per Child project
  8  */
  9 #include <linux/kernel.h>
 10 #include <linux/module.h>
 11 #include <linux/device.h>
 12 #include <linux/list.h>
 13 #include <linux/pci.h>
 14 #include <linux/gpio.h>
 15 #include <linux/interrupt.h>
 16 #include <linux/platform_device.h>
 17 #include <linux/videodev2.h>
 18 #include <media/v4l2-device.h>
 19 #include <media/v4l2-ioctl.h>
 20 #include <media/v4l2-ctrls.h>
 21 #include <media/v4l2-image-sizes.h>
 22 #include <media/i2c/ov7670.h>
 23 #include <media/videobuf-dma-sg.h>
 24 #include <linux/delay.h>
 25 #include <linux/dma-mapping.h>
 26 #include <linux/pm_qos.h>
 27 #include <linux/via-core.h>
 28 #include <linux/via-gpio.h>
 29 #include <linux/via_i2c.h>
 30 #include <asm/olpc.h>
 31 
 32 #include "via-camera.h"
 33 
 34 MODULE_ALIAS("platform:viafb-camera");
 35 MODULE_AUTHOR("Jonathan Corbet <corbet@lwn.net>");
 36 MODULE_DESCRIPTION("VIA framebuffer-based camera controller driver");
 37 MODULE_LICENSE("GPL");
 38 
 39 static bool flip_image;
 40 module_param(flip_image, bool, 0444);
 41 MODULE_PARM_DESC(flip_image,
 42                 "If set, the sensor will be instructed to flip the image vertically.");
 43 
 44 static bool override_serial;
 45 module_param(override_serial, bool, 0444);
 46 MODULE_PARM_DESC(override_serial,
 47                 "The camera driver will normally refuse to load if the XO 1.5 serial port is enabled.  Set this option to force-enable the camera.");
 48 
 49 /*
 50  * The structure describing our camera.
 51  */
 52 enum viacam_opstate { S_IDLE = 0, S_RUNNING = 1 };
 53 
 54 struct via_camera {
 55         struct v4l2_device v4l2_dev;
 56         struct v4l2_ctrl_handler ctrl_handler;
 57         struct video_device vdev;
 58         struct v4l2_subdev *sensor;
 59         struct platform_device *platdev;
 60         struct viafb_dev *viadev;
 61         struct mutex lock;
 62         enum viacam_opstate opstate;
 63         unsigned long flags;
 64         struct pm_qos_request qos_request;
 65         /*
 66          * GPIO info for power/reset management
 67          */
 68         int power_gpio;
 69         int reset_gpio;
 70         /*
 71          * I/O memory stuff.
 72          */
 73         void __iomem *mmio;     /* Where the registers live */
 74         void __iomem *fbmem;    /* Frame buffer memory */
 75         u32 fb_offset;          /* Reserved memory offset (FB) */
 76         /*
 77          * Capture buffers and related.  The controller supports
 78          * up to three, so that's what we have here.  These buffers
 79          * live in frame buffer memory, so we don't call them "DMA".
 80          */
 81         unsigned int cb_offsets[3];     /* offsets into fb mem */
 82         u8 __iomem *cb_addrs[3];                /* Kernel-space addresses */
 83         int n_cap_bufs;                 /* How many are we using? */
 84         int next_buf;
 85         struct videobuf_queue vb_queue;
 86         struct list_head buffer_queue;  /* prot. by reg_lock */
 87         /*
 88          * User tracking.
 89          */
 90         int users;
 91         struct file *owner;
 92         /*
 93          * Video format information.  sensor_format is kept in a form
 94          * that we can use to pass to the sensor.  We always run the
 95          * sensor in VGA resolution, though, and let the controller
 96          * downscale things if need be.  So we keep the "real*
 97          * dimensions separately.
 98          */
 99         struct v4l2_pix_format sensor_format;
100         struct v4l2_pix_format user_format;
101         u32 mbus_code;
102 };
103 
104 /*
105  * Yes, this is a hack, but there's only going to be one of these
106  * on any system we know of.
107  */
108 static struct via_camera *via_cam_info;
109 
110 /*
111  * Flag values, manipulated with bitops
112  */
113 #define CF_DMA_ACTIVE    0      /* A frame is incoming */
114 #define CF_CONFIG_NEEDED 1      /* Must configure hardware */
115 
116 
117 /*
118  * Nasty ugly v4l2 boilerplate.
119  */
120 #define sensor_call(cam, optype, func, args...) \
121         v4l2_subdev_call(cam->sensor, optype, func, ##args)
122 
123 /*
124  * Debugging and related.
125  */
126 #define cam_err(cam, fmt, arg...) \
127         dev_err(&(cam)->platdev->dev, fmt, ##arg);
128 #define cam_warn(cam, fmt, arg...) \
129         dev_warn(&(cam)->platdev->dev, fmt, ##arg);
130 #define cam_dbg(cam, fmt, arg...) \
131         dev_dbg(&(cam)->platdev->dev, fmt, ##arg);
132 
133 /*
134  * Format handling.  This is ripped almost directly from Hans's changes
135  * to cafe_ccic.c.  It's a little unfortunate; until this change, we
136  * didn't need to know anything about the format except its byte depth;
137  * now this information must be managed at this level too.
138  */
139 static struct via_format {
140         __u8 *desc;
141         __u32 pixelformat;
142         int bpp;   /* Bytes per pixel */
143         u32 mbus_code;
144 } via_formats[] = {
145         {
146                 .desc           = "YUYV 4:2:2",
147                 .pixelformat    = V4L2_PIX_FMT_YUYV,
148                 .mbus_code      = MEDIA_BUS_FMT_YUYV8_2X8,
149                 .bpp            = 2,
150         },
151         /* RGB444 and Bayer should be doable, but have never been
152            tested with this driver. RGB565 seems to work at the default
153            resolution, but results in color corruption when being scaled by
154            viacam_set_scaled(), and is disabled as a result. */
155 };
156 #define N_VIA_FMTS ARRAY_SIZE(via_formats)
157 
158 static struct via_format *via_find_format(u32 pixelformat)
159 {
160         unsigned i;
161 
162         for (i = 0; i < N_VIA_FMTS; i++)
163                 if (via_formats[i].pixelformat == pixelformat)
164                         return via_formats + i;
165         /* Not found? Then return the first format. */
166         return via_formats;
167 }
168 
169 
170 /*--------------------------------------------------------------------------*/
171 /*
172  * Sensor power/reset management.  This piece is OLPC-specific for
173  * sure; other configurations will have things connected differently.
174  */
175 static int via_sensor_power_setup(struct via_camera *cam)
176 {
177         int ret;
178 
179         cam->power_gpio = viafb_gpio_lookup("VGPIO3");
180         cam->reset_gpio = viafb_gpio_lookup("VGPIO2");
181         if (cam->power_gpio < 0 || cam->reset_gpio < 0) {
182                 dev_err(&cam->platdev->dev, "Unable to find GPIO lines\n");
183                 return -EINVAL;
184         }
185         ret = gpio_request(cam->power_gpio, "viafb-camera");
186         if (ret) {
187                 dev_err(&cam->platdev->dev, "Unable to request power GPIO\n");
188                 return ret;
189         }
190         ret = gpio_request(cam->reset_gpio, "viafb-camera");
191         if (ret) {
192                 dev_err(&cam->platdev->dev, "Unable to request reset GPIO\n");
193                 gpio_free(cam->power_gpio);
194                 return ret;
195         }
196         gpio_direction_output(cam->power_gpio, 0);
197         gpio_direction_output(cam->reset_gpio, 0);
198         return 0;
199 }
200 
201 /*
202  * Power up the sensor and perform the reset dance.
203  */
204 static void via_sensor_power_up(struct via_camera *cam)
205 {
206         gpio_set_value(cam->power_gpio, 1);
207         gpio_set_value(cam->reset_gpio, 0);
208         msleep(20);  /* Probably excessive */
209         gpio_set_value(cam->reset_gpio, 1);
210         msleep(20);
211 }
212 
213 static void via_sensor_power_down(struct via_camera *cam)
214 {
215         gpio_set_value(cam->power_gpio, 0);
216         gpio_set_value(cam->reset_gpio, 0);
217 }
218 
219 
220 static void via_sensor_power_release(struct via_camera *cam)
221 {
222         via_sensor_power_down(cam);
223         gpio_free(cam->power_gpio);
224         gpio_free(cam->reset_gpio);
225 }
226 
227 /* --------------------------------------------------------------------------*/
228 /* Sensor ops */
229 
230 /*
231  * Manage the ov7670 "flip" bit, which needs special help.
232  */
233 static int viacam_set_flip(struct via_camera *cam)
234 {
235         struct v4l2_control ctrl;
236 
237         memset(&ctrl, 0, sizeof(ctrl));
238         ctrl.id = V4L2_CID_VFLIP;
239         ctrl.value = flip_image;
240         return v4l2_s_ctrl(NULL, cam->sensor->ctrl_handler, &ctrl);
241 }
242 
243 /*
244  * Configure the sensor.  It's up to the caller to ensure
245  * that the camera is in the correct operating state.
246  */
247 static int viacam_configure_sensor(struct via_camera *cam)
248 {
249         struct v4l2_subdev_format format = {
250                 .which = V4L2_SUBDEV_FORMAT_ACTIVE,
251         };
252         int ret;
253 
254         v4l2_fill_mbus_format(&format.format, &cam->sensor_format, cam->mbus_code);
255         ret = sensor_call(cam, core, init, 0);
256         if (ret == 0)
257                 ret = sensor_call(cam, pad, set_fmt, NULL, &format);
258         /*
259          * OV7670 does weird things if flip is set *before* format...
260          */
261         if (ret == 0)
262                 ret = viacam_set_flip(cam);
263         return ret;
264 }
265 
266 
267 
268 /* --------------------------------------------------------------------------*/
269 /*
270  * Some simple register accessors; they assume that the lock is held.
271  *
272  * Should we want to support the second capture engine, we could
273  * hide the register difference by adding 0x1000 to registers in the
274  * 0x300-350 range.
275  */
276 static inline void viacam_write_reg(struct via_camera *cam,
277                 int reg, int value)
278 {
279         iowrite32(value, cam->mmio + reg);
280 }
281 
282 static inline int viacam_read_reg(struct via_camera *cam, int reg)
283 {
284         return ioread32(cam->mmio + reg);
285 }
286 
287 static inline void viacam_write_reg_mask(struct via_camera *cam,
288                 int reg, int value, int mask)
289 {
290         int tmp = viacam_read_reg(cam, reg);
291 
292         tmp = (tmp & ~mask) | (value & mask);
293         viacam_write_reg(cam, reg, tmp);
294 }
295 
296 
297 /* --------------------------------------------------------------------------*/
298 /* Interrupt management and handling */
299 
300 static irqreturn_t viacam_quick_irq(int irq, void *data)
301 {
302         struct via_camera *cam = data;
303         irqreturn_t ret = IRQ_NONE;
304         int icv;
305 
306         /*
307          * All we do here is to clear the interrupts and tell
308          * the handler thread to wake up.
309          */
310         spin_lock(&cam->viadev->reg_lock);
311         icv = viacam_read_reg(cam, VCR_INTCTRL);
312         if (icv & VCR_IC_EAV) {
313                 icv |= VCR_IC_EAV|VCR_IC_EVBI|VCR_IC_FFULL;
314                 viacam_write_reg(cam, VCR_INTCTRL, icv);
315                 ret = IRQ_WAKE_THREAD;
316         }
317         spin_unlock(&cam->viadev->reg_lock);
318         return ret;
319 }
320 
321 /*
322  * Find the next videobuf buffer which has somebody waiting on it.
323  */
324 static struct videobuf_buffer *viacam_next_buffer(struct via_camera *cam)
325 {
326         unsigned long flags;
327         struct videobuf_buffer *buf = NULL;
328 
329         spin_lock_irqsave(&cam->viadev->reg_lock, flags);
330         if (cam->opstate != S_RUNNING)
331                 goto out;
332         if (list_empty(&cam->buffer_queue))
333                 goto out;
334         buf = list_entry(cam->buffer_queue.next, struct videobuf_buffer, queue);
335         if (!waitqueue_active(&buf->done)) {/* Nobody waiting */
336                 buf = NULL;
337                 goto out;
338         }
339         list_del(&buf->queue);
340         buf->state = VIDEOBUF_ACTIVE;
341 out:
342         spin_unlock_irqrestore(&cam->viadev->reg_lock, flags);
343         return buf;
344 }
345 
346 /*
347  * The threaded IRQ handler.
348  */
349 static irqreturn_t viacam_irq(int irq, void *data)
350 {
351         int bufn;
352         struct videobuf_buffer *vb;
353         struct via_camera *cam = data;
354         struct videobuf_dmabuf *vdma;
355 
356         /*
357          * If there is no place to put the data frame, don't bother
358          * with anything else.
359          */
360         vb = viacam_next_buffer(cam);
361         if (vb == NULL)
362                 goto done;
363         /*
364          * Figure out which buffer we just completed.
365          */
366         bufn = (viacam_read_reg(cam, VCR_INTCTRL) & VCR_IC_ACTBUF) >> 3;
367         bufn -= 1;
368         if (bufn < 0)
369                 bufn = cam->n_cap_bufs - 1;
370         /*
371          * Copy over the data and let any waiters know.
372          */
373         vdma = videobuf_to_dma(vb);
374         viafb_dma_copy_out_sg(cam->cb_offsets[bufn], vdma->sglist, vdma->sglen);
375         vb->state = VIDEOBUF_DONE;
376         vb->size = cam->user_format.sizeimage;
377         wake_up(&vb->done);
378 done:
379         return IRQ_HANDLED;
380 }
381 
382 
383 /*
384  * These functions must mess around with the general interrupt
385  * control register, which is relevant to much more than just the
386  * camera.  Nothing else uses interrupts, though, as of this writing.
387  * Should that situation change, we'll have to improve support at
388  * the via-core level.
389  */
390 static void viacam_int_enable(struct via_camera *cam)
391 {
392         viacam_write_reg(cam, VCR_INTCTRL,
393                         VCR_IC_INTEN|VCR_IC_EAV|VCR_IC_EVBI|VCR_IC_FFULL);
394         viafb_irq_enable(VDE_I_C0AVEN);
395 }
396 
397 static void viacam_int_disable(struct via_camera *cam)
398 {
399         viafb_irq_disable(VDE_I_C0AVEN);
400         viacam_write_reg(cam, VCR_INTCTRL, 0);
401 }
402 
403 
404 
405 /* --------------------------------------------------------------------------*/
406 /* Controller operations */
407 
408 /*
409  * Set up our capture buffers in framebuffer memory.
410  */
411 static int viacam_ctlr_cbufs(struct via_camera *cam)
412 {
413         int nbuf = cam->viadev->camera_fbmem_size/cam->sensor_format.sizeimage;
414         int i;
415         unsigned int offset;
416 
417         /*
418          * See how many buffers we can work with.
419          */
420         if (nbuf >= 3) {
421                 cam->n_cap_bufs = 3;
422                 viacam_write_reg_mask(cam, VCR_CAPINTC, VCR_CI_3BUFS,
423                                 VCR_CI_3BUFS);
424         } else if (nbuf == 2) {
425                 cam->n_cap_bufs = 2;
426                 viacam_write_reg_mask(cam, VCR_CAPINTC, 0, VCR_CI_3BUFS);
427         } else {
428                 cam_warn(cam, "Insufficient frame buffer memory\n");
429                 return -ENOMEM;
430         }
431         /*
432          * Set them up.
433          */
434         offset = cam->fb_offset;
435         for (i = 0; i < cam->n_cap_bufs; i++) {
436                 cam->cb_offsets[i] = offset;
437                 cam->cb_addrs[i] = cam->fbmem + offset;
438                 viacam_write_reg(cam, VCR_VBUF1 + i*4, offset & VCR_VBUF_MASK);
439                 offset += cam->sensor_format.sizeimage;
440         }
441         return 0;
442 }
443 
444 /*
445  * Set the scaling register for downscaling the image.
446  *
447  * This register works like this...  Vertical scaling is enabled
448  * by bit 26; if that bit is set, downscaling is controlled by the
449  * value in bits 16:25.  Those bits are divided by 1024 to get
450  * the scaling factor; setting just bit 25 thus cuts the height
451  * in half.
452  *
453  * Horizontal scaling works about the same, but it's enabled by
454  * bit 11, with bits 0:10 giving the numerator of a fraction
455  * (over 2048) for the scaling value.
456  *
457  * This function is naive in that, if the user departs from
458  * the 3x4 VGA scaling factor, the image will distort.  We
459  * could work around that if it really seemed important.
460  */
461 static void viacam_set_scale(struct via_camera *cam)
462 {
463         unsigned int avscale;
464         int sf;
465 
466         if (cam->user_format.width == VGA_WIDTH)
467                 avscale = 0;
468         else {
469                 sf = (cam->user_format.width*2048)/VGA_WIDTH;
470                 avscale = VCR_AVS_HEN | sf;
471         }
472         if (cam->user_format.height < VGA_HEIGHT) {
473                 sf = (1024*cam->user_format.height)/VGA_HEIGHT;
474                 avscale |= VCR_AVS_VEN | (sf << 16);
475         }
476         viacam_write_reg(cam, VCR_AVSCALE, avscale);
477 }
478 
479 
480 /*
481  * Configure image-related information into the capture engine.
482  */
483 static void viacam_ctlr_image(struct via_camera *cam)
484 {
485         int cicreg;
486 
487         /*
488          * Disable clock before messing with stuff - from the via
489          * sample driver.
490          */
491         viacam_write_reg(cam, VCR_CAPINTC, ~(VCR_CI_ENABLE|VCR_CI_CLKEN));
492         /*
493          * Set up the controller for VGA resolution, modulo magic
494          * offsets from the via sample driver.
495          */
496         viacam_write_reg(cam, VCR_HORRANGE, 0x06200120);
497         viacam_write_reg(cam, VCR_VERTRANGE, 0x01de0000);
498         viacam_set_scale(cam);
499         /*
500          * Image size info.
501          */
502         viacam_write_reg(cam, VCR_MAXDATA,
503                         (cam->sensor_format.height << 16) |
504                         (cam->sensor_format.bytesperline >> 3));
505         viacam_write_reg(cam, VCR_MAXVBI, 0);
506         viacam_write_reg(cam, VCR_VSTRIDE,
507                         cam->user_format.bytesperline & VCR_VS_STRIDE);
508         /*
509          * Set up the capture interface control register,
510          * everything but the "go" bit.
511          *
512          * The FIFO threshold is a bit of a magic number; 8 is what
513          * VIA's sample code uses.
514          */
515         cicreg = VCR_CI_CLKEN |
516                 0x08000000 |            /* FIFO threshold */
517                 VCR_CI_FLDINV |         /* OLPC-specific? */
518                 VCR_CI_VREFINV |        /* OLPC-specific? */
519                 VCR_CI_DIBOTH |         /* Capture both fields */
520                 VCR_CI_CCIR601_8;
521         if (cam->n_cap_bufs == 3)
522                 cicreg |= VCR_CI_3BUFS;
523         /*
524          * YUV formats need different byte swapping than RGB.
525          */
526         if (cam->user_format.pixelformat == V4L2_PIX_FMT_YUYV)
527                 cicreg |= VCR_CI_YUYV;
528         else
529                 cicreg |= VCR_CI_UYVY;
530         viacam_write_reg(cam, VCR_CAPINTC, cicreg);
531 }
532 
533 
534 static int viacam_config_controller(struct via_camera *cam)
535 {
536         int ret;
537         unsigned long flags;
538 
539         spin_lock_irqsave(&cam->viadev->reg_lock, flags);
540         ret = viacam_ctlr_cbufs(cam);
541         if (!ret)
542                 viacam_ctlr_image(cam);
543         spin_unlock_irqrestore(&cam->viadev->reg_lock, flags);
544         clear_bit(CF_CONFIG_NEEDED, &cam->flags);
545         return ret;
546 }
547 
548 /*
549  * Make it start grabbing data.
550  */
551 static void viacam_start_engine(struct via_camera *cam)
552 {
553         spin_lock_irq(&cam->viadev->reg_lock);
554         cam->next_buf = 0;
555         viacam_write_reg_mask(cam, VCR_CAPINTC, VCR_CI_ENABLE, VCR_CI_ENABLE);
556         viacam_int_enable(cam);
557         (void) viacam_read_reg(cam, VCR_CAPINTC); /* Force post */
558         cam->opstate = S_RUNNING;
559         spin_unlock_irq(&cam->viadev->reg_lock);
560 }
561 
562 
563 static void viacam_stop_engine(struct via_camera *cam)
564 {
565         spin_lock_irq(&cam->viadev->reg_lock);
566         viacam_int_disable(cam);
567         viacam_write_reg_mask(cam, VCR_CAPINTC, 0, VCR_CI_ENABLE);
568         (void) viacam_read_reg(cam, VCR_CAPINTC); /* Force post */
569         cam->opstate = S_IDLE;
570         spin_unlock_irq(&cam->viadev->reg_lock);
571 }
572 
573 
574 /* --------------------------------------------------------------------------*/
575 /* Videobuf callback ops */
576 
577 /*
578  * buffer_setup.  The purpose of this one would appear to be to tell
579  * videobuf how big a single image is.  It's also evidently up to us
580  * to put some sort of limit on the maximum number of buffers allowed.
581  */
582 static int viacam_vb_buf_setup(struct videobuf_queue *q,
583                 unsigned int *count, unsigned int *size)
584 {
585         struct via_camera *cam = q->priv_data;
586 
587         *size = cam->user_format.sizeimage;
588         if (*count == 0 || *count > 6)  /* Arbitrary number */
589                 *count = 6;
590         return 0;
591 }
592 
593 /*
594  * Prepare a buffer.
595  */
596 static int viacam_vb_buf_prepare(struct videobuf_queue *q,
597                 struct videobuf_buffer *vb, enum v4l2_field field)
598 {
599         struct via_camera *cam = q->priv_data;
600 
601         vb->size = cam->user_format.sizeimage;
602         vb->width = cam->user_format.width; /* bytesperline???? */
603         vb->height = cam->user_format.height;
604         vb->field = field;
605         if (vb->state == VIDEOBUF_NEEDS_INIT) {
606                 int ret = videobuf_iolock(q, vb, NULL);
607                 if (ret)
608                         return ret;
609         }
610         vb->state = VIDEOBUF_PREPARED;
611         return 0;
612 }
613 
614 /*
615  * We've got a buffer to put data into.
616  *
617  * FIXME: check for a running engine and valid buffers?
618  */
619 static void viacam_vb_buf_queue(struct videobuf_queue *q,
620                 struct videobuf_buffer *vb)
621 {
622         struct via_camera *cam = q->priv_data;
623 
624         /*
625          * Note that videobuf holds the lock when it calls
626          * us, so we need not (indeed, cannot) take it here.
627          */
628         vb->state = VIDEOBUF_QUEUED;
629         list_add_tail(&vb->queue, &cam->buffer_queue);
630 }
631 
632 /*
633  * Free a buffer.
634  */
635 static void viacam_vb_buf_release(struct videobuf_queue *q,
636                 struct videobuf_buffer *vb)
637 {
638         struct via_camera *cam = q->priv_data;
639 
640         videobuf_dma_unmap(&cam->platdev->dev, videobuf_to_dma(vb));
641         videobuf_dma_free(videobuf_to_dma(vb));
642         vb->state = VIDEOBUF_NEEDS_INIT;
643 }
644 
645 static const struct videobuf_queue_ops viacam_vb_ops = {
646         .buf_setup      = viacam_vb_buf_setup,
647         .buf_prepare    = viacam_vb_buf_prepare,
648         .buf_queue      = viacam_vb_buf_queue,
649         .buf_release    = viacam_vb_buf_release,
650 };
651 
652 /* --------------------------------------------------------------------------*/
653 /* File operations */
654 
655 static int viacam_open(struct file *filp)
656 {
657         struct via_camera *cam = video_drvdata(filp);
658 
659         filp->private_data = cam;
660         /*
661          * Note the new user.  If this is the first one, we'll also
662          * need to power up the sensor.
663          */
664         mutex_lock(&cam->lock);
665         if (cam->users == 0) {
666                 int ret = viafb_request_dma();
667 
668                 if (ret) {
669                         mutex_unlock(&cam->lock);
670                         return ret;
671                 }
672                 via_sensor_power_up(cam);
673                 set_bit(CF_CONFIG_NEEDED, &cam->flags);
674                 /*
675                  * Hook into videobuf.  Evidently this cannot fail.
676                  */
677                 videobuf_queue_sg_init(&cam->vb_queue, &viacam_vb_ops,
678                                 &cam->platdev->dev, &cam->viadev->reg_lock,
679                                 V4L2_BUF_TYPE_VIDEO_CAPTURE, V4L2_FIELD_NONE,
680                                 sizeof(struct videobuf_buffer), cam, NULL);
681         }
682         (cam->users)++;
683         mutex_unlock(&cam->lock);
684         return 0;
685 }
686 
687 static int viacam_release(struct file *filp)
688 {
689         struct via_camera *cam = video_drvdata(filp);
690 
691         mutex_lock(&cam->lock);
692         (cam->users)--;
693         /*
694          * If the "owner" is closing, shut down any ongoing
695          * operations.
696          */
697         if (filp == cam->owner) {
698                 videobuf_stop(&cam->vb_queue);
699                 /*
700                  * We don't hold the spinlock here, but, if release()
701                  * is being called by the owner, nobody else will
702                  * be changing the state.  And an extra stop would
703                  * not hurt anyway.
704                  */
705                 if (cam->opstate != S_IDLE)
706                         viacam_stop_engine(cam);
707                 cam->owner = NULL;
708         }
709         /*
710          * Last one out needs to turn out the lights.
711          */
712         if (cam->users == 0) {
713                 videobuf_mmap_free(&cam->vb_queue);
714                 via_sensor_power_down(cam);
715                 viafb_release_dma();
716         }
717         mutex_unlock(&cam->lock);
718         return 0;
719 }
720 
721 /*
722  * Read a frame from the device.
723  */
724 static ssize_t viacam_read(struct file *filp, char __user *buffer,
725                 size_t len, loff_t *pos)
726 {
727         struct via_camera *cam = video_drvdata(filp);
728         int ret;
729 
730         mutex_lock(&cam->lock);
731         /*
732          * Enforce the V4l2 "only one owner gets to read data" rule.
733          */
734         if (cam->owner && cam->owner != filp) {
735                 ret = -EBUSY;
736                 goto out_unlock;
737         }
738         cam->owner = filp;
739         /*
740          * Do we need to configure the hardware?
741          */
742         if (test_bit(CF_CONFIG_NEEDED, &cam->flags)) {
743                 ret = viacam_configure_sensor(cam);
744                 if (!ret)
745                         ret = viacam_config_controller(cam);
746                 if (ret)
747                         goto out_unlock;
748         }
749         /*
750          * Fire up the capture engine, then have videobuf do
751          * the heavy lifting.  Someday it would be good to avoid
752          * stopping and restarting the engine each time.
753          */
754         INIT_LIST_HEAD(&cam->buffer_queue);
755         viacam_start_engine(cam);
756         ret = videobuf_read_stream(&cam->vb_queue, buffer, len, pos, 0,
757                         filp->f_flags & O_NONBLOCK);
758         viacam_stop_engine(cam);
759         /* videobuf_stop() ?? */
760 
761 out_unlock:
762         mutex_unlock(&cam->lock);
763         return ret;
764 }
765 
766 
767 static unsigned int viacam_poll(struct file *filp, struct poll_table_struct *pt)
768 {
769         struct via_camera *cam = video_drvdata(filp);
770 
771         return videobuf_poll_stream(filp, &cam->vb_queue, pt);
772 }
773 
774 
775 static int viacam_mmap(struct file *filp, struct vm_area_struct *vma)
776 {
777         struct via_camera *cam = video_drvdata(filp);
778 
779         return videobuf_mmap_mapper(&cam->vb_queue, vma);
780 }
781 
782 
783 
784 static const struct v4l2_file_operations viacam_fops = {
785         .owner          = THIS_MODULE,
786         .open           = viacam_open,
787         .release        = viacam_release,
788         .read           = viacam_read,
789         .poll           = viacam_poll,
790         .mmap           = viacam_mmap,
791         .unlocked_ioctl = video_ioctl2,
792 };
793 
794 /*----------------------------------------------------------------------------*/
795 /*
796  * The long list of v4l2 ioctl ops
797  */
798 
799 /*
800  * Only one input.
801  */
802 static int viacam_enum_input(struct file *filp, void *priv,
803                 struct v4l2_input *input)
804 {
805         if (input->index != 0)
806                 return -EINVAL;
807 
808         input->type = V4L2_INPUT_TYPE_CAMERA;
809         input->std = V4L2_STD_ALL; /* Not sure what should go here */
810         strcpy(input->name, "Camera");
811         return 0;
812 }
813 
814 static int viacam_g_input(struct file *filp, void *priv, unsigned int *i)
815 {
816         *i = 0;
817         return 0;
818 }
819 
820 static int viacam_s_input(struct file *filp, void *priv, unsigned int i)
821 {
822         if (i != 0)
823                 return -EINVAL;
824         return 0;
825 }
826 
827 static int viacam_s_std(struct file *filp, void *priv, v4l2_std_id std)
828 {
829         return 0;
830 }
831 
832 static int viacam_g_std(struct file *filp, void *priv, v4l2_std_id *std)
833 {
834         *std = V4L2_STD_NTSC_M;
835         return 0;
836 }
837 
838 /*
839  * Video format stuff.  Here is our default format until
840  * user space messes with things.
841  */
842 static const struct v4l2_pix_format viacam_def_pix_format = {
843         .width          = VGA_WIDTH,
844         .height         = VGA_HEIGHT,
845         .pixelformat    = V4L2_PIX_FMT_YUYV,
846         .field          = V4L2_FIELD_NONE,
847         .bytesperline   = VGA_WIDTH * 2,
848         .sizeimage      = VGA_WIDTH * VGA_HEIGHT * 2,
849 };
850 
851 static const u32 via_def_mbus_code = MEDIA_BUS_FMT_YUYV8_2X8;
852 
853 static int viacam_enum_fmt_vid_cap(struct file *filp, void *priv,
854                 struct v4l2_fmtdesc *fmt)
855 {
856         if (fmt->index >= N_VIA_FMTS)
857                 return -EINVAL;
858         strlcpy(fmt->description, via_formats[fmt->index].desc,
859                         sizeof(fmt->description));
860         fmt->pixelformat = via_formats[fmt->index].pixelformat;
861         return 0;
862 }
863 
864 /*
865  * Figure out proper image dimensions, but always force the
866  * sensor to VGA.
867  */
868 static void viacam_fmt_pre(struct v4l2_pix_format *userfmt,
869                 struct v4l2_pix_format *sensorfmt)
870 {
871         *sensorfmt = *userfmt;
872         if (userfmt->width < QCIF_WIDTH || userfmt->height < QCIF_HEIGHT) {
873                 userfmt->width = QCIF_WIDTH;
874                 userfmt->height = QCIF_HEIGHT;
875         }
876         if (userfmt->width > VGA_WIDTH || userfmt->height > VGA_HEIGHT) {
877                 userfmt->width = VGA_WIDTH;
878                 userfmt->height = VGA_HEIGHT;
879         }
880         sensorfmt->width = VGA_WIDTH;
881         sensorfmt->height = VGA_HEIGHT;
882 }
883 
884 static void viacam_fmt_post(struct v4l2_pix_format *userfmt,
885                 struct v4l2_pix_format *sensorfmt)
886 {
887         struct via_format *f = via_find_format(userfmt->pixelformat);
888 
889         sensorfmt->bytesperline = sensorfmt->width * f->bpp;
890         sensorfmt->sizeimage = sensorfmt->height * sensorfmt->bytesperline;
891         userfmt->pixelformat = sensorfmt->pixelformat;
892         userfmt->field = sensorfmt->field;
893         userfmt->bytesperline = 2 * userfmt->width;
894         userfmt->sizeimage = userfmt->bytesperline * userfmt->height;
895 }
896 
897 
898 /*
899  * The real work of figuring out a workable format.
900  */
901 static int viacam_do_try_fmt(struct via_camera *cam,
902                 struct v4l2_pix_format *upix, struct v4l2_pix_format *spix)
903 {
904         int ret;
905         struct v4l2_subdev_pad_config pad_cfg;
906         struct v4l2_subdev_format format = {
907                 .which = V4L2_SUBDEV_FORMAT_TRY,
908         };
909         struct via_format *f = via_find_format(upix->pixelformat);
910 
911         upix->pixelformat = f->pixelformat;
912         viacam_fmt_pre(upix, spix);
913         v4l2_fill_mbus_format(&format.format, spix, f->mbus_code);
914         ret = sensor_call(cam, pad, set_fmt, &pad_cfg, &format);
915         v4l2_fill_pix_format(spix, &format.format);
916         viacam_fmt_post(upix, spix);
917         return ret;
918 }
919 
920 
921 
922 static int viacam_try_fmt_vid_cap(struct file *filp, void *priv,
923                 struct v4l2_format *fmt)
924 {
925         struct via_camera *cam = priv;
926         struct v4l2_format sfmt;
927         int ret;
928 
929         mutex_lock(&cam->lock);
930         ret = viacam_do_try_fmt(cam, &fmt->fmt.pix, &sfmt.fmt.pix);
931         mutex_unlock(&cam->lock);
932         return ret;
933 }
934 
935 
936 static int viacam_g_fmt_vid_cap(struct file *filp, void *priv,
937                 struct v4l2_format *fmt)
938 {
939         struct via_camera *cam = priv;
940 
941         mutex_lock(&cam->lock);
942         fmt->fmt.pix = cam->user_format;
943         mutex_unlock(&cam->lock);
944         return 0;
945 }
946 
947 static int viacam_s_fmt_vid_cap(struct file *filp, void *priv,
948                 struct v4l2_format *fmt)
949 {
950         struct via_camera *cam = priv;
951         int ret;
952         struct v4l2_format sfmt;
953         struct via_format *f = via_find_format(fmt->fmt.pix.pixelformat);
954 
955         /*
956          * Camera must be idle or we can't mess with the
957          * video setup.
958          */
959         mutex_lock(&cam->lock);
960         if (cam->opstate != S_IDLE) {
961                 ret = -EBUSY;
962                 goto out;
963         }
964         /*
965          * Let the sensor code look over and tweak the
966          * requested formatting.
967          */
968         ret = viacam_do_try_fmt(cam, &fmt->fmt.pix, &sfmt.fmt.pix);
969         if (ret)
970                 goto out;
971         /*
972          * OK, let's commit to the new format.
973          */
974         cam->user_format = fmt->fmt.pix;
975         cam->sensor_format = sfmt.fmt.pix;
976         cam->mbus_code = f->mbus_code;
977         ret = viacam_configure_sensor(cam);
978         if (!ret)
979                 ret = viacam_config_controller(cam);
980 out:
981         mutex_unlock(&cam->lock);
982         return ret;
983 }
984 
985 static int viacam_querycap(struct file *filp, void *priv,
986                 struct v4l2_capability *cap)
987 {
988         strcpy(cap->driver, "via-camera");
989         strcpy(cap->card, "via-camera");
990         cap->device_caps = V4L2_CAP_VIDEO_CAPTURE |
991                 V4L2_CAP_READWRITE | V4L2_CAP_STREAMING;
992         cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
993         return 0;
994 }
995 
996 /*
997  * Streaming operations - pure videobuf stuff.
998  */
999 static int viacam_reqbufs(struct file *filp, void *priv,
1000                 struct v4l2_requestbuffers *rb)
1001 {
1002         struct via_camera *cam = priv;
1003 
1004         return videobuf_reqbufs(&cam->vb_queue, rb);
1005 }
1006 
1007 static int viacam_querybuf(struct file *filp, void *priv,
1008                 struct v4l2_buffer *buf)
1009 {
1010         struct via_camera *cam = priv;
1011 
1012         return videobuf_querybuf(&cam->vb_queue, buf);
1013 }
1014 
1015 static int viacam_qbuf(struct file *filp, void *priv, struct v4l2_buffer *buf)
1016 {
1017         struct via_camera *cam = priv;
1018 
1019         return videobuf_qbuf(&cam->vb_queue, buf);
1020 }
1021 
1022 static int viacam_dqbuf(struct file *filp, void *priv, struct v4l2_buffer *buf)
1023 {
1024         struct via_camera *cam = priv;
1025 
1026         return videobuf_dqbuf(&cam->vb_queue, buf, filp->f_flags & O_NONBLOCK);
1027 }
1028 
1029 static int viacam_streamon(struct file *filp, void *priv, enum v4l2_buf_type t)
1030 {
1031         struct via_camera *cam = priv;
1032         int ret = 0;
1033 
1034         if (t != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1035                 return -EINVAL;
1036 
1037         mutex_lock(&cam->lock);
1038         if (cam->opstate != S_IDLE) {
1039                 ret = -EBUSY;
1040                 goto out;
1041         }
1042         /*
1043          * Enforce the V4l2 "only one owner gets to read data" rule.
1044          */
1045         if (cam->owner && cam->owner != filp) {
1046                 ret = -EBUSY;
1047                 goto out;
1048         }
1049         cam->owner = filp;
1050         /*
1051          * Configure things if need be.
1052          */
1053         if (test_bit(CF_CONFIG_NEEDED, &cam->flags)) {
1054                 ret = viacam_configure_sensor(cam);
1055                 if (ret)
1056                         goto out;
1057                 ret = viacam_config_controller(cam);
1058                 if (ret)
1059                         goto out;
1060         }
1061         /*
1062          * If the CPU goes into C3, the DMA transfer gets corrupted and
1063          * users start filing unsightly bug reports.  Put in a "latency"
1064          * requirement which will keep the CPU out of the deeper sleep
1065          * states.
1066          */
1067         pm_qos_add_request(&cam->qos_request, PM_QOS_CPU_DMA_LATENCY, 50);
1068         /*
1069          * Fire things up.
1070          */
1071         INIT_LIST_HEAD(&cam->buffer_queue);
1072         ret = videobuf_streamon(&cam->vb_queue);
1073         if (!ret)
1074                 viacam_start_engine(cam);
1075 out:
1076         mutex_unlock(&cam->lock);
1077         return ret;
1078 }
1079 
1080 static int viacam_streamoff(struct file *filp, void *priv, enum v4l2_buf_type t)
1081 {
1082         struct via_camera *cam = priv;
1083         int ret;
1084 
1085         if (t != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1086                 return -EINVAL;
1087         mutex_lock(&cam->lock);
1088         if (cam->opstate != S_RUNNING) {
1089                 ret = -EINVAL;
1090                 goto out;
1091         }
1092         pm_qos_remove_request(&cam->qos_request);
1093         viacam_stop_engine(cam);
1094         /*
1095          * Videobuf will recycle all of the outstanding buffers, but
1096          * we should be sure we don't retain any references to
1097          * any of them.
1098          */
1099         ret = videobuf_streamoff(&cam->vb_queue);
1100         INIT_LIST_HEAD(&cam->buffer_queue);
1101 out:
1102         mutex_unlock(&cam->lock);
1103         return ret;
1104 }
1105 
1106 /* G/S_PARM */
1107 
1108 static int viacam_g_parm(struct file *filp, void *priv,
1109                 struct v4l2_streamparm *parm)
1110 {
1111         struct via_camera *cam = priv;
1112         int ret;
1113 
1114         mutex_lock(&cam->lock);
1115         ret = sensor_call(cam, video, g_parm, parm);
1116         mutex_unlock(&cam->lock);
1117         parm->parm.capture.readbuffers = cam->n_cap_bufs;
1118         return ret;
1119 }
1120 
1121 static int viacam_s_parm(struct file *filp, void *priv,
1122                 struct v4l2_streamparm *parm)
1123 {
1124         struct via_camera *cam = priv;
1125         int ret;
1126 
1127         mutex_lock(&cam->lock);
1128         ret = sensor_call(cam, video, s_parm, parm);
1129         mutex_unlock(&cam->lock);
1130         parm->parm.capture.readbuffers = cam->n_cap_bufs;
1131         return ret;
1132 }
1133 
1134 static int viacam_enum_framesizes(struct file *filp, void *priv,
1135                 struct v4l2_frmsizeenum *sizes)
1136 {
1137         if (sizes->index != 0)
1138                 return -EINVAL;
1139         sizes->type = V4L2_FRMSIZE_TYPE_CONTINUOUS;
1140         sizes->stepwise.min_width = QCIF_WIDTH;
1141         sizes->stepwise.min_height = QCIF_HEIGHT;
1142         sizes->stepwise.max_width = VGA_WIDTH;
1143         sizes->stepwise.max_height = VGA_HEIGHT;
1144         sizes->stepwise.step_width = sizes->stepwise.step_height = 1;
1145         return 0;
1146 }
1147 
1148 static int viacam_enum_frameintervals(struct file *filp, void *priv,
1149                 struct v4l2_frmivalenum *interval)
1150 {
1151         struct via_camera *cam = priv;
1152         struct v4l2_subdev_frame_interval_enum fie = {
1153                 .index = interval->index,
1154                 .code = cam->mbus_code,
1155                 .width = cam->sensor_format.width,
1156                 .height = cam->sensor_format.height,
1157                 .which = V4L2_SUBDEV_FORMAT_ACTIVE,
1158         };
1159         int ret;
1160 
1161         mutex_lock(&cam->lock);
1162         ret = sensor_call(cam, pad, enum_frame_interval, NULL, &fie);
1163         mutex_unlock(&cam->lock);
1164         if (ret)
1165                 return ret;
1166         interval->type = V4L2_FRMIVAL_TYPE_DISCRETE;
1167         interval->discrete = fie.interval;
1168         return 0;
1169 }
1170 
1171 
1172 
1173 static const struct v4l2_ioctl_ops viacam_ioctl_ops = {
1174         .vidioc_enum_input      = viacam_enum_input,
1175         .vidioc_g_input         = viacam_g_input,
1176         .vidioc_s_input         = viacam_s_input,
1177         .vidioc_s_std           = viacam_s_std,
1178         .vidioc_g_std           = viacam_g_std,
1179         .vidioc_enum_fmt_vid_cap = viacam_enum_fmt_vid_cap,
1180         .vidioc_try_fmt_vid_cap = viacam_try_fmt_vid_cap,
1181         .vidioc_g_fmt_vid_cap   = viacam_g_fmt_vid_cap,
1182         .vidioc_s_fmt_vid_cap   = viacam_s_fmt_vid_cap,
1183         .vidioc_querycap        = viacam_querycap,
1184         .vidioc_reqbufs         = viacam_reqbufs,
1185         .vidioc_querybuf        = viacam_querybuf,
1186         .vidioc_qbuf            = viacam_qbuf,
1187         .vidioc_dqbuf           = viacam_dqbuf,
1188         .vidioc_streamon        = viacam_streamon,
1189         .vidioc_streamoff       = viacam_streamoff,
1190         .vidioc_g_parm          = viacam_g_parm,
1191         .vidioc_s_parm          = viacam_s_parm,
1192         .vidioc_enum_framesizes = viacam_enum_framesizes,
1193         .vidioc_enum_frameintervals = viacam_enum_frameintervals,
1194 };
1195 
1196 /*----------------------------------------------------------------------------*/
1197 
1198 /*
1199  * Power management.
1200  */
1201 #ifdef CONFIG_PM
1202 
1203 static int viacam_suspend(void *priv)
1204 {
1205         struct via_camera *cam = priv;
1206         enum viacam_opstate state = cam->opstate;
1207 
1208         if (cam->opstate != S_IDLE) {
1209                 viacam_stop_engine(cam);
1210                 cam->opstate = state; /* So resume restarts */
1211         }
1212 
1213         return 0;
1214 }
1215 
1216 static int viacam_resume(void *priv)
1217 {
1218         struct via_camera *cam = priv;
1219         int ret = 0;
1220 
1221         /*
1222          * Get back to a reasonable operating state.
1223          */
1224         via_write_reg_mask(VIASR, 0x78, 0, 0x80);
1225         via_write_reg_mask(VIASR, 0x1e, 0xc0, 0xc0);
1226         viacam_int_disable(cam);
1227         set_bit(CF_CONFIG_NEEDED, &cam->flags);
1228         /*
1229          * Make sure the sensor's power state is correct
1230          */
1231         if (cam->users > 0)
1232                 via_sensor_power_up(cam);
1233         else
1234                 via_sensor_power_down(cam);
1235         /*
1236          * If it was operating, try to restart it.
1237          */
1238         if (cam->opstate != S_IDLE) {
1239                 mutex_lock(&cam->lock);
1240                 ret = viacam_configure_sensor(cam);
1241                 if (!ret)
1242                         ret = viacam_config_controller(cam);
1243                 mutex_unlock(&cam->lock);
1244                 if (!ret)
1245                         viacam_start_engine(cam);
1246         }
1247 
1248         return ret;
1249 }
1250 
1251 static struct viafb_pm_hooks viacam_pm_hooks = {
1252         .suspend = viacam_suspend,
1253         .resume = viacam_resume
1254 };
1255 
1256 #endif /* CONFIG_PM */
1257 
1258 /*
1259  * Setup stuff.
1260  */
1261 
1262 static struct video_device viacam_v4l_template = {
1263         .name           = "via-camera",
1264         .minor          = -1,
1265         .tvnorms        = V4L2_STD_NTSC_M,
1266         .fops           = &viacam_fops,
1267         .ioctl_ops      = &viacam_ioctl_ops,
1268         .release        = video_device_release_empty, /* Check this */
1269 };
1270 
1271 /*
1272  * The OLPC folks put the serial port on the same pin as
1273  * the camera.  They also get grumpy if we break the
1274  * serial port and keep them from using it.  So we have
1275  * to check the serial enable bit and not step on it.
1276  */
1277 #define VIACAM_SERIAL_DEVFN 0x88
1278 #define VIACAM_SERIAL_CREG 0x46
1279 #define VIACAM_SERIAL_BIT 0x40
1280 
1281 static bool viacam_serial_is_enabled(void)
1282 {
1283         struct pci_bus *pbus = pci_find_bus(0, 0);
1284         u8 cbyte;
1285 
1286         if (!pbus)
1287                 return false;
1288         pci_bus_read_config_byte(pbus, VIACAM_SERIAL_DEVFN,
1289                         VIACAM_SERIAL_CREG, &cbyte);
1290         if ((cbyte & VIACAM_SERIAL_BIT) == 0)
1291                 return false; /* Not enabled */
1292         if (!override_serial) {
1293                 printk(KERN_NOTICE "Via camera: serial port is enabled, " \
1294                                 "refusing to load.\n");
1295                 printk(KERN_NOTICE "Specify override_serial=1 to force " \
1296                                 "module loading.\n");
1297                 return true;
1298         }
1299         printk(KERN_NOTICE "Via camera: overriding serial port\n");
1300         pci_bus_write_config_byte(pbus, VIACAM_SERIAL_DEVFN,
1301                         VIACAM_SERIAL_CREG, cbyte & ~VIACAM_SERIAL_BIT);
1302         return false;
1303 }
1304 
1305 static struct ov7670_config sensor_cfg = {
1306         /* The XO-1.5 (only known user) clocks the camera at 90MHz. */
1307         .clock_speed = 90,
1308 };
1309 
1310 static int viacam_probe(struct platform_device *pdev)
1311 {
1312         int ret;
1313         struct i2c_adapter *sensor_adapter;
1314         struct viafb_dev *viadev = pdev->dev.platform_data;
1315         struct i2c_board_info ov7670_info = {
1316                 .type = "ov7670",
1317                 .addr = 0x42 >> 1,
1318                 .platform_data = &sensor_cfg,
1319         };
1320 
1321         /*
1322          * Note that there are actually two capture channels on
1323          * the device.  We only deal with one for now.  That
1324          * is encoded here; nothing else assumes it's dealing with
1325          * a unique capture device.
1326          */
1327         struct via_camera *cam;
1328 
1329         /*
1330          * Ensure that frame buffer memory has been set aside for
1331          * this purpose.  As an arbitrary limit, refuse to work
1332          * with less than two frames of VGA 16-bit data.
1333          *
1334          * If we ever support the second port, we'll need to set
1335          * aside more memory.
1336          */
1337         if (viadev->camera_fbmem_size < (VGA_HEIGHT*VGA_WIDTH*4)) {
1338                 printk(KERN_ERR "viacam: insufficient FB memory reserved\n");
1339                 return -ENOMEM;
1340         }
1341         if (viadev->engine_mmio == NULL) {
1342                 printk(KERN_ERR "viacam: No I/O memory, so no pictures\n");
1343                 return -ENOMEM;
1344         }
1345 
1346         if (machine_is_olpc() && viacam_serial_is_enabled())
1347                 return -EBUSY;
1348 
1349         /*
1350          * Basic structure initialization.
1351          */
1352         cam = kzalloc (sizeof(struct via_camera), GFP_KERNEL);
1353         if (cam == NULL)
1354                 return -ENOMEM;
1355         via_cam_info = cam;
1356         cam->platdev = pdev;
1357         cam->viadev = viadev;
1358         cam->users = 0;
1359         cam->owner = NULL;
1360         cam->opstate = S_IDLE;
1361         cam->user_format = cam->sensor_format = viacam_def_pix_format;
1362         mutex_init(&cam->lock);
1363         INIT_LIST_HEAD(&cam->buffer_queue);
1364         cam->mmio = viadev->engine_mmio;
1365         cam->fbmem = viadev->fbmem;
1366         cam->fb_offset = viadev->camera_fbmem_offset;
1367         cam->flags = 1 << CF_CONFIG_NEEDED;
1368         cam->mbus_code = via_def_mbus_code;
1369         /*
1370          * Tell V4L that we exist.
1371          */
1372         ret = v4l2_device_register(&pdev->dev, &cam->v4l2_dev);
1373         if (ret) {
1374                 dev_err(&pdev->dev, "Unable to register v4l2 device\n");
1375                 goto out_free;
1376         }
1377         ret = v4l2_ctrl_handler_init(&cam->ctrl_handler, 10);
1378         if (ret)
1379                 goto out_unregister;
1380         cam->v4l2_dev.ctrl_handler = &cam->ctrl_handler;
1381         /*
1382          * Convince the system that we can do DMA.
1383          */
1384         pdev->dev.dma_mask = &viadev->pdev->dma_mask;
1385         dma_set_mask(&pdev->dev, 0xffffffff);
1386         /*
1387          * Fire up the capture port.  The write to 0x78 looks purely
1388          * OLPCish; any system will need to tweak 0x1e.
1389          */
1390         via_write_reg_mask(VIASR, 0x78, 0, 0x80);
1391         via_write_reg_mask(VIASR, 0x1e, 0xc0, 0xc0);
1392         /*
1393          * Get the sensor powered up.
1394          */
1395         ret = via_sensor_power_setup(cam);
1396         if (ret)
1397                 goto out_ctrl_hdl_free;
1398         via_sensor_power_up(cam);
1399 
1400         /*
1401          * See if we can't find it on the bus.  The VIA_PORT_31 assumption
1402          * is OLPC-specific.  0x42 assumption is ov7670-specific.
1403          */
1404         sensor_adapter = viafb_find_i2c_adapter(VIA_PORT_31);
1405         cam->sensor = v4l2_i2c_new_subdev_board(&cam->v4l2_dev, sensor_adapter,
1406                         &ov7670_info, NULL);
1407         if (cam->sensor == NULL) {
1408                 dev_err(&pdev->dev, "Unable to find the sensor!\n");
1409                 ret = -ENODEV;
1410                 goto out_power_down;
1411         }
1412         /*
1413          * Get the IRQ.
1414          */
1415         viacam_int_disable(cam);
1416         ret = request_threaded_irq(viadev->pdev->irq, viacam_quick_irq,
1417                         viacam_irq, IRQF_SHARED, "via-camera", cam);
1418         if (ret)
1419                 goto out_power_down;
1420         /*
1421          * Tell V4l2 that we exist.
1422          */
1423         cam->vdev = viacam_v4l_template;
1424         cam->vdev.v4l2_dev = &cam->v4l2_dev;
1425         ret = video_register_device(&cam->vdev, VFL_TYPE_GRABBER, -1);
1426         if (ret)
1427                 goto out_irq;
1428         video_set_drvdata(&cam->vdev, cam);
1429 
1430 #ifdef CONFIG_PM
1431         /*
1432          * Hook into PM events
1433          */
1434         viacam_pm_hooks.private = cam;
1435         viafb_pm_register(&viacam_pm_hooks);
1436 #endif
1437 
1438         /* Power the sensor down until somebody opens the device */
1439         via_sensor_power_down(cam);
1440         return 0;
1441 
1442 out_irq:
1443         free_irq(viadev->pdev->irq, cam);
1444 out_power_down:
1445         via_sensor_power_release(cam);
1446 out_ctrl_hdl_free:
1447         v4l2_ctrl_handler_free(&cam->ctrl_handler);
1448 out_unregister:
1449         v4l2_device_unregister(&cam->v4l2_dev);
1450 out_free:
1451         kfree(cam);
1452         return ret;
1453 }
1454 
1455 static int viacam_remove(struct platform_device *pdev)
1456 {
1457         struct via_camera *cam = via_cam_info;
1458         struct viafb_dev *viadev = pdev->dev.platform_data;
1459 
1460         video_unregister_device(&cam->vdev);
1461         v4l2_device_unregister(&cam->v4l2_dev);
1462         free_irq(viadev->pdev->irq, cam);
1463         via_sensor_power_release(cam);
1464         v4l2_ctrl_handler_free(&cam->ctrl_handler);
1465         kfree(cam);
1466         via_cam_info = NULL;
1467         return 0;
1468 }
1469 
1470 static struct platform_driver viacam_driver = {
1471         .driver = {
1472                 .name = "viafb-camera",
1473         },
1474         .probe = viacam_probe,
1475         .remove = viacam_remove,
1476 };
1477 
1478 module_platform_driver(viacam_driver);
1479 

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