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
31#ifdef CONFIG_X86
32#include <asm/olpc.h>
33#else
34#define machine_is_olpc(x) 0
35#endif
36
37#include "via-camera.h"
38
39MODULE_ALIAS("platform:viafb-camera");
40MODULE_AUTHOR("Jonathan Corbet <corbet@lwn.net>");
41MODULE_DESCRIPTION("VIA framebuffer-based camera controller driver");
42MODULE_LICENSE("GPL");
43
44static bool flip_image;
45module_param(flip_image, bool, 0444);
46MODULE_PARM_DESC(flip_image,
47 "If set, the sensor will be instructed to flip the image vertically.");
48
49static bool override_serial;
50module_param(override_serial, bool, 0444);
51MODULE_PARM_DESC(override_serial,
52 "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.");
53
54/*
55 * The structure describing our camera.
56 */
57enum viacam_opstate { S_IDLE = 0, S_RUNNING = 1 };
58
59struct via_camera {
60 struct v4l2_device v4l2_dev;
61 struct v4l2_ctrl_handler ctrl_handler;
62 struct video_device vdev;
63 struct v4l2_subdev *sensor;
64 struct platform_device *platdev;
65 struct viafb_dev *viadev;
66 struct mutex lock;
67 enum viacam_opstate opstate;
68 unsigned long flags;
69 struct pm_qos_request qos_request;
70 /*
71 * GPIO info for power/reset management
72 */
73 int power_gpio;
74 int reset_gpio;
75 /*
76 * I/O memory stuff.
77 */
78 void __iomem *mmio; /* Where the registers live */
79 void __iomem *fbmem; /* Frame buffer memory */
80 u32 fb_offset; /* Reserved memory offset (FB) */
81 /*
82 * Capture buffers and related. The controller supports
83 * up to three, so that's what we have here. These buffers
84 * live in frame buffer memory, so we don't call them "DMA".
85 */
86 unsigned int cb_offsets[3]; /* offsets into fb mem */
87 u8 __iomem *cb_addrs[3]; /* Kernel-space addresses */
88 int n_cap_bufs; /* How many are we using? */
89 int next_buf;
90 struct videobuf_queue vb_queue;
91 struct list_head buffer_queue; /* prot. by reg_lock */
92 /*
93 * User tracking.
94 */
95 int users;
96 struct file *owner;
97 /*
98 * Video format information. sensor_format is kept in a form
99 * that we can use to pass to the sensor. We always run the
100 * sensor in VGA resolution, though, and let the controller
101 * downscale things if need be. So we keep the "real*
102 * dimensions separately.
103 */
104 struct v4l2_pix_format sensor_format;
105 struct v4l2_pix_format user_format;
106 u32 mbus_code;
107};
108
109/*
110 * Yes, this is a hack, but there's only going to be one of these
111 * on any system we know of.
112 */
113static struct via_camera *via_cam_info;
114
115/*
116 * Flag values, manipulated with bitops
117 */
118#define CF_DMA_ACTIVE 0 /* A frame is incoming */
119#define CF_CONFIG_NEEDED 1 /* Must configure hardware */
120
121
122/*
123 * Nasty ugly v4l2 boilerplate.
124 */
125#define sensor_call(cam, optype, func, args...) \
126 v4l2_subdev_call(cam->sensor, optype, func, ##args)
127
128/*
129 * Debugging and related.
130 */
131#define cam_err(cam, fmt, arg...) \
132 dev_err(&(cam)->platdev->dev, fmt, ##arg);
133#define cam_warn(cam, fmt, arg...) \
134 dev_warn(&(cam)->platdev->dev, fmt, ##arg);
135#define cam_dbg(cam, fmt, arg...) \
136 dev_dbg(&(cam)->platdev->dev, fmt, ##arg);
137
138/*
139 * Format handling. This is ripped almost directly from Hans's changes
140 * to cafe_ccic.c. It's a little unfortunate; until this change, we
141 * didn't need to know anything about the format except its byte depth;
142 * now this information must be managed at this level too.
143 */
144static struct via_format {
145 __u8 *desc;
146 __u32 pixelformat;
147 int bpp; /* Bytes per pixel */
148 u32 mbus_code;
149} via_formats[] = {
150 {
151 .desc = "YUYV 4:2:2",
152 .pixelformat = V4L2_PIX_FMT_YUYV,
153 .mbus_code = MEDIA_BUS_FMT_YUYV8_2X8,
154 .bpp = 2,
155 },
156 /* RGB444 and Bayer should be doable, but have never been
157 tested with this driver. RGB565 seems to work at the default
158 resolution, but results in color corruption when being scaled by
159 viacam_set_scaled(), and is disabled as a result. */
160};
161#define N_VIA_FMTS ARRAY_SIZE(via_formats)
162
163static struct via_format *via_find_format(u32 pixelformat)
164{
165 unsigned i;
166
167 for (i = 0; i < N_VIA_FMTS; i++)
168 if (via_formats[i].pixelformat == pixelformat)
169 return via_formats + i;
170 /* Not found? Then return the first format. */
171 return via_formats;
172}
173
174
175/*--------------------------------------------------------------------------*/
176/*
177 * Sensor power/reset management. This piece is OLPC-specific for
178 * sure; other configurations will have things connected differently.
179 */
180static int via_sensor_power_setup(struct via_camera *cam)
181{
182 int ret;
183
184 cam->power_gpio = viafb_gpio_lookup("VGPIO3");
185 cam->reset_gpio = viafb_gpio_lookup("VGPIO2");
186 if (!gpio_is_valid(cam->power_gpio) || !gpio_is_valid(cam->reset_gpio)) {
187 dev_err(&cam->platdev->dev, "Unable to find GPIO lines\n");
188 return -EINVAL;
189 }
190 ret = gpio_request(cam->power_gpio, "viafb-camera");
191 if (ret) {
192 dev_err(&cam->platdev->dev, "Unable to request power GPIO\n");
193 return ret;
194 }
195 ret = gpio_request(cam->reset_gpio, "viafb-camera");
196 if (ret) {
197 dev_err(&cam->platdev->dev, "Unable to request reset GPIO\n");
198 gpio_free(cam->power_gpio);
199 return ret;
200 }
201 gpio_direction_output(cam->power_gpio, 0);
202 gpio_direction_output(cam->reset_gpio, 0);
203 return 0;
204}
205
206/*
207 * Power up the sensor and perform the reset dance.
208 */
209static void via_sensor_power_up(struct via_camera *cam)
210{
211 gpio_set_value(cam->power_gpio, 1);
212 gpio_set_value(cam->reset_gpio, 0);
213 msleep(20); /* Probably excessive */
214 gpio_set_value(cam->reset_gpio, 1);
215 msleep(20);
216}
217
218static void via_sensor_power_down(struct via_camera *cam)
219{
220 gpio_set_value(cam->power_gpio, 0);
221 gpio_set_value(cam->reset_gpio, 0);
222}
223
224
225static void via_sensor_power_release(struct via_camera *cam)
226{
227 via_sensor_power_down(cam);
228 gpio_free(cam->power_gpio);
229 gpio_free(cam->reset_gpio);
230}
231
232/* --------------------------------------------------------------------------*/
233/* Sensor ops */
234
235/*
236 * Manage the ov7670 "flip" bit, which needs special help.
237 */
238static int viacam_set_flip(struct via_camera *cam)
239{
240 struct v4l2_control ctrl;
241
242 memset(&ctrl, 0, sizeof(ctrl));
243 ctrl.id = V4L2_CID_VFLIP;
244 ctrl.value = flip_image;
245 return v4l2_s_ctrl(NULL, cam->sensor->ctrl_handler, &ctrl);
246}
247
248/*
249 * Configure the sensor. It's up to the caller to ensure
250 * that the camera is in the correct operating state.
251 */
252static int viacam_configure_sensor(struct via_camera *cam)
253{
254 struct v4l2_subdev_format format = {
255 .which = V4L2_SUBDEV_FORMAT_ACTIVE,
256 };
257 int ret;
258
259 v4l2_fill_mbus_format(&format.format, &cam->sensor_format, cam->mbus_code);
260 ret = sensor_call(cam, core, init, 0);
261 if (ret == 0)
262 ret = sensor_call(cam, pad, set_fmt, NULL, &format);
263 /*
264 * OV7670 does weird things if flip is set *before* format...
265 */
266 if (ret == 0)
267 ret = viacam_set_flip(cam);
268 return ret;
269}
270
271
272
273/* --------------------------------------------------------------------------*/
274/*
275 * Some simple register accessors; they assume that the lock is held.
276 *
277 * Should we want to support the second capture engine, we could
278 * hide the register difference by adding 0x1000 to registers in the
279 * 0x300-350 range.
280 */
281static inline void viacam_write_reg(struct via_camera *cam,
282 int reg, int value)
283{
284 iowrite32(value, cam->mmio + reg);
285}
286
287static inline int viacam_read_reg(struct via_camera *cam, int reg)
288{
289 return ioread32(cam->mmio + reg);
290}
291
292static inline void viacam_write_reg_mask(struct via_camera *cam,
293 int reg, int value, int mask)
294{
295 int tmp = viacam_read_reg(cam, reg);
296
297 tmp = (tmp & ~mask) | (value & mask);
298 viacam_write_reg(cam, reg, tmp);
299}
300
301
302/* --------------------------------------------------------------------------*/
303/* Interrupt management and handling */
304
305static irqreturn_t viacam_quick_irq(int irq, void *data)
306{
307 struct via_camera *cam = data;
308 irqreturn_t ret = IRQ_NONE;
309 int icv;
310
311 /*
312 * All we do here is to clear the interrupts and tell
313 * the handler thread to wake up.
314 */
315 spin_lock(&cam->viadev->reg_lock);
316 icv = viacam_read_reg(cam, VCR_INTCTRL);
317 if (icv & VCR_IC_EAV) {
318 icv |= VCR_IC_EAV|VCR_IC_EVBI|VCR_IC_FFULL;
319 viacam_write_reg(cam, VCR_INTCTRL, icv);
320 ret = IRQ_WAKE_THREAD;
321 }
322 spin_unlock(&cam->viadev->reg_lock);
323 return ret;
324}
325
326/*
327 * Find the next videobuf buffer which has somebody waiting on it.
328 */
329static struct videobuf_buffer *viacam_next_buffer(struct via_camera *cam)
330{
331 unsigned long flags;
332 struct videobuf_buffer *buf = NULL;
333
334 spin_lock_irqsave(&cam->viadev->reg_lock, flags);
335 if (cam->opstate != S_RUNNING)
336 goto out;
337 if (list_empty(&cam->buffer_queue))
338 goto out;
339 buf = list_entry(cam->buffer_queue.next, struct videobuf_buffer, queue);
340 if (!waitqueue_active(&buf->done)) {/* Nobody waiting */
341 buf = NULL;
342 goto out;
343 }
344 list_del(&buf->queue);
345 buf->state = VIDEOBUF_ACTIVE;
346out:
347 spin_unlock_irqrestore(&cam->viadev->reg_lock, flags);
348 return buf;
349}
350
351/*
352 * The threaded IRQ handler.
353 */
354static irqreturn_t viacam_irq(int irq, void *data)
355{
356 int bufn;
357 struct videobuf_buffer *vb;
358 struct via_camera *cam = data;
359 struct videobuf_dmabuf *vdma;
360
361 /*
362 * If there is no place to put the data frame, don't bother
363 * with anything else.
364 */
365 vb = viacam_next_buffer(cam);
366 if (vb == NULL)
367 goto done;
368 /*
369 * Figure out which buffer we just completed.
370 */
371 bufn = (viacam_read_reg(cam, VCR_INTCTRL) & VCR_IC_ACTBUF) >> 3;
372 bufn -= 1;
373 if (bufn < 0)
374 bufn = cam->n_cap_bufs - 1;
375 /*
376 * Copy over the data and let any waiters know.
377 */
378 vdma = videobuf_to_dma(vb);
379 viafb_dma_copy_out_sg(cam->cb_offsets[bufn], vdma->sglist, vdma->sglen);
380 vb->state = VIDEOBUF_DONE;
381 vb->size = cam->user_format.sizeimage;
382 wake_up(&vb->done);
383done:
384 return IRQ_HANDLED;
385}
386
387
388/*
389 * These functions must mess around with the general interrupt
390 * control register, which is relevant to much more than just the
391 * camera. Nothing else uses interrupts, though, as of this writing.
392 * Should that situation change, we'll have to improve support at
393 * the via-core level.
394 */
395static void viacam_int_enable(struct via_camera *cam)
396{
397 viacam_write_reg(cam, VCR_INTCTRL,
398 VCR_IC_INTEN|VCR_IC_EAV|VCR_IC_EVBI|VCR_IC_FFULL);
399 viafb_irq_enable(VDE_I_C0AVEN);
400}
401
402static void viacam_int_disable(struct via_camera *cam)
403{
404 viafb_irq_disable(VDE_I_C0AVEN);
405 viacam_write_reg(cam, VCR_INTCTRL, 0);
406}
407
408
409
410/* --------------------------------------------------------------------------*/
411/* Controller operations */
412
413/*
414 * Set up our capture buffers in framebuffer memory.
415 */
416static int viacam_ctlr_cbufs(struct via_camera *cam)
417{
418 int nbuf = cam->viadev->camera_fbmem_size/cam->sensor_format.sizeimage;
419 int i;
420 unsigned int offset;
421
422 /*
423 * See how many buffers we can work with.
424 */
425 if (nbuf >= 3) {
426 cam->n_cap_bufs = 3;
427 viacam_write_reg_mask(cam, VCR_CAPINTC, VCR_CI_3BUFS,
428 VCR_CI_3BUFS);
429 } else if (nbuf == 2) {
430 cam->n_cap_bufs = 2;
431 viacam_write_reg_mask(cam, VCR_CAPINTC, 0, VCR_CI_3BUFS);
432 } else {
433 cam_warn(cam, "Insufficient frame buffer memory\n");
434 return -ENOMEM;
435 }
436 /*
437 * Set them up.
438 */
439 offset = cam->fb_offset;
440 for (i = 0; i < cam->n_cap_bufs; i++) {
441 cam->cb_offsets[i] = offset;
442 cam->cb_addrs[i] = cam->fbmem + offset;
443 viacam_write_reg(cam, VCR_VBUF1 + i*4, offset & VCR_VBUF_MASK);
444 offset += cam->sensor_format.sizeimage;
445 }
446 return 0;
447}
448
449/*
450 * Set the scaling register for downscaling the image.
451 *
452 * This register works like this... Vertical scaling is enabled
453 * by bit 26; if that bit is set, downscaling is controlled by the
454 * value in bits 16:25. Those bits are divided by 1024 to get
455 * the scaling factor; setting just bit 25 thus cuts the height
456 * in half.
457 *
458 * Horizontal scaling works about the same, but it's enabled by
459 * bit 11, with bits 0:10 giving the numerator of a fraction
460 * (over 2048) for the scaling value.
461 *
462 * This function is naive in that, if the user departs from
463 * the 3x4 VGA scaling factor, the image will distort. We
464 * could work around that if it really seemed important.
465 */
466static void viacam_set_scale(struct via_camera *cam)
467{
468 unsigned int avscale;
469 int sf;
470
471 if (cam->user_format.width == VGA_WIDTH)
472 avscale = 0;
473 else {
474 sf = (cam->user_format.width*2048)/VGA_WIDTH;
475 avscale = VCR_AVS_HEN | sf;
476 }
477 if (cam->user_format.height < VGA_HEIGHT) {
478 sf = (1024*cam->user_format.height)/VGA_HEIGHT;
479 avscale |= VCR_AVS_VEN | (sf << 16);
480 }
481 viacam_write_reg(cam, VCR_AVSCALE, avscale);
482}
483
484
485/*
486 * Configure image-related information into the capture engine.
487 */
488static void viacam_ctlr_image(struct via_camera *cam)
489{
490 int cicreg;
491
492 /*
493 * Disable clock before messing with stuff - from the via
494 * sample driver.
495 */
496 viacam_write_reg(cam, VCR_CAPINTC, ~(VCR_CI_ENABLE|VCR_CI_CLKEN));
497 /*
498 * Set up the controller for VGA resolution, modulo magic
499 * offsets from the via sample driver.
500 */
501 viacam_write_reg(cam, VCR_HORRANGE, 0x06200120);
502 viacam_write_reg(cam, VCR_VERTRANGE, 0x01de0000);
503 viacam_set_scale(cam);
504 /*
505 * Image size info.
506 */
507 viacam_write_reg(cam, VCR_MAXDATA,
508 (cam->sensor_format.height << 16) |
509 (cam->sensor_format.bytesperline >> 3));
510 viacam_write_reg(cam, VCR_MAXVBI, 0);
511 viacam_write_reg(cam, VCR_VSTRIDE,
512 cam->user_format.bytesperline & VCR_VS_STRIDE);
513 /*
514 * Set up the capture interface control register,
515 * everything but the "go" bit.
516 *
517 * The FIFO threshold is a bit of a magic number; 8 is what
518 * VIA's sample code uses.
519 */
520 cicreg = VCR_CI_CLKEN |
521 0x08000000 | /* FIFO threshold */
522 VCR_CI_FLDINV | /* OLPC-specific? */
523 VCR_CI_VREFINV | /* OLPC-specific? */
524 VCR_CI_DIBOTH | /* Capture both fields */
525 VCR_CI_CCIR601_8;
526 if (cam->n_cap_bufs == 3)
527 cicreg |= VCR_CI_3BUFS;
528 /*
529 * YUV formats need different byte swapping than RGB.
530 */
531 if (cam->user_format.pixelformat == V4L2_PIX_FMT_YUYV)
532 cicreg |= VCR_CI_YUYV;
533 else
534 cicreg |= VCR_CI_UYVY;
535 viacam_write_reg(cam, VCR_CAPINTC, cicreg);
536}
537
538
539static int viacam_config_controller(struct via_camera *cam)
540{
541 int ret;
542 unsigned long flags;
543
544 spin_lock_irqsave(&cam->viadev->reg_lock, flags);
545 ret = viacam_ctlr_cbufs(cam);
546 if (!ret)
547 viacam_ctlr_image(cam);
548 spin_unlock_irqrestore(&cam->viadev->reg_lock, flags);
549 clear_bit(CF_CONFIG_NEEDED, &cam->flags);
550 return ret;
551}
552
553/*
554 * Make it start grabbing data.
555 */
556static void viacam_start_engine(struct via_camera *cam)
557{
558 spin_lock_irq(&cam->viadev->reg_lock);
559 cam->next_buf = 0;
560 viacam_write_reg_mask(cam, VCR_CAPINTC, VCR_CI_ENABLE, VCR_CI_ENABLE);
561 viacam_int_enable(cam);
562 (void) viacam_read_reg(cam, VCR_CAPINTC); /* Force post */
563 cam->opstate = S_RUNNING;
564 spin_unlock_irq(&cam->viadev->reg_lock);
565}
566
567
568static void viacam_stop_engine(struct via_camera *cam)
569{
570 spin_lock_irq(&cam->viadev->reg_lock);
571 viacam_int_disable(cam);
572 viacam_write_reg_mask(cam, VCR_CAPINTC, 0, VCR_CI_ENABLE);
573 (void) viacam_read_reg(cam, VCR_CAPINTC); /* Force post */
574 cam->opstate = S_IDLE;
575 spin_unlock_irq(&cam->viadev->reg_lock);
576}
577
578
579/* --------------------------------------------------------------------------*/
580/* Videobuf callback ops */
581
582/*
583 * buffer_setup. The purpose of this one would appear to be to tell
584 * videobuf how big a single image is. It's also evidently up to us
585 * to put some sort of limit on the maximum number of buffers allowed.
586 */
587static int viacam_vb_buf_setup(struct videobuf_queue *q,
588 unsigned int *count, unsigned int *size)
589{
590 struct via_camera *cam = q->priv_data;
591
592 *size = cam->user_format.sizeimage;
593 if (*count == 0 || *count > 6) /* Arbitrary number */
594 *count = 6;
595 return 0;
596}
597
598/*
599 * Prepare a buffer.
600 */
601static int viacam_vb_buf_prepare(struct videobuf_queue *q,
602 struct videobuf_buffer *vb, enum v4l2_field field)
603{
604 struct via_camera *cam = q->priv_data;
605
606 vb->size = cam->user_format.sizeimage;
607 vb->width = cam->user_format.width; /* bytesperline???? */
608 vb->height = cam->user_format.height;
609 vb->field = field;
610 if (vb->state == VIDEOBUF_NEEDS_INIT) {
611 int ret = videobuf_iolock(q, vb, NULL);
612 if (ret)
613 return ret;
614 }
615 vb->state = VIDEOBUF_PREPARED;
616 return 0;
617}
618
619/*
620 * We've got a buffer to put data into.
621 *
622 * FIXME: check for a running engine and valid buffers?
623 */
624static void viacam_vb_buf_queue(struct videobuf_queue *q,
625 struct videobuf_buffer *vb)
626{
627 struct via_camera *cam = q->priv_data;
628
629 /*
630 * Note that videobuf holds the lock when it calls
631 * us, so we need not (indeed, cannot) take it here.
632 */
633 vb->state = VIDEOBUF_QUEUED;
634 list_add_tail(&vb->queue, &cam->buffer_queue);
635}
636
637/*
638 * Free a buffer.
639 */
640static void viacam_vb_buf_release(struct videobuf_queue *q,
641 struct videobuf_buffer *vb)
642{
643 struct via_camera *cam = q->priv_data;
644
645 videobuf_dma_unmap(&cam->platdev->dev, videobuf_to_dma(vb));
646 videobuf_dma_free(videobuf_to_dma(vb));
647 vb->state = VIDEOBUF_NEEDS_INIT;
648}
649
650static const struct videobuf_queue_ops viacam_vb_ops = {
651 .buf_setup = viacam_vb_buf_setup,
652 .buf_prepare = viacam_vb_buf_prepare,
653 .buf_queue = viacam_vb_buf_queue,
654 .buf_release = viacam_vb_buf_release,
655};
656
657/* --------------------------------------------------------------------------*/
658/* File operations */
659
660static int viacam_open(struct file *filp)
661{
662 struct via_camera *cam = video_drvdata(filp);
663
664 filp->private_data = cam;
665 /*
666 * Note the new user. If this is the first one, we'll also
667 * need to power up the sensor.
668 */
669 mutex_lock(&cam->lock);
670 if (cam->users == 0) {
671 int ret = viafb_request_dma();
672
673 if (ret) {
674 mutex_unlock(&cam->lock);
675 return ret;
676 }
677 via_sensor_power_up(cam);
678 set_bit(CF_CONFIG_NEEDED, &cam->flags);
679 /*
680 * Hook into videobuf. Evidently this cannot fail.
681 */
682 videobuf_queue_sg_init(&cam->vb_queue, &viacam_vb_ops,
683 &cam->platdev->dev, &cam->viadev->reg_lock,
684 V4L2_BUF_TYPE_VIDEO_CAPTURE, V4L2_FIELD_NONE,
685 sizeof(struct videobuf_buffer), cam, NULL);
686 }
687 (cam->users)++;
688 mutex_unlock(&cam->lock);
689 return 0;
690}
691
692static int viacam_release(struct file *filp)
693{
694 struct via_camera *cam = video_drvdata(filp);
695
696 mutex_lock(&cam->lock);
697 (cam->users)--;
698 /*
699 * If the "owner" is closing, shut down any ongoing
700 * operations.
701 */
702 if (filp == cam->owner) {
703 videobuf_stop(&cam->vb_queue);
704 /*
705 * We don't hold the spinlock here, but, if release()
706 * is being called by the owner, nobody else will
707 * be changing the state. And an extra stop would
708 * not hurt anyway.
709 */
710 if (cam->opstate != S_IDLE)
711 viacam_stop_engine(cam);
712 cam->owner = NULL;
713 }
714 /*
715 * Last one out needs to turn out the lights.
716 */
717 if (cam->users == 0) {
718 videobuf_mmap_free(&cam->vb_queue);
719 via_sensor_power_down(cam);
720 viafb_release_dma();
721 }
722 mutex_unlock(&cam->lock);
723 return 0;
724}
725
726/*
727 * Read a frame from the device.
728 */
729static ssize_t viacam_read(struct file *filp, char __user *buffer,
730 size_t len, loff_t *pos)
731{
732 struct via_camera *cam = video_drvdata(filp);
733 int ret;
734
735 mutex_lock(&cam->lock);
736 /*
737 * Enforce the V4l2 "only one owner gets to read data" rule.
738 */
739 if (cam->owner && cam->owner != filp) {
740 ret = -EBUSY;
741 goto out_unlock;
742 }
743 cam->owner = filp;
744 /*
745 * Do we need to configure the hardware?
746 */
747 if (test_bit(CF_CONFIG_NEEDED, &cam->flags)) {
748 ret = viacam_configure_sensor(cam);
749 if (!ret)
750 ret = viacam_config_controller(cam);
751 if (ret)
752 goto out_unlock;
753 }
754 /*
755 * Fire up the capture engine, then have videobuf do
756 * the heavy lifting. Someday it would be good to avoid
757 * stopping and restarting the engine each time.
758 */
759 INIT_LIST_HEAD(&cam->buffer_queue);
760 viacam_start_engine(cam);
761 ret = videobuf_read_stream(&cam->vb_queue, buffer, len, pos, 0,
762 filp->f_flags & O_NONBLOCK);
763 viacam_stop_engine(cam);
764 /* videobuf_stop() ?? */
765
766out_unlock:
767 mutex_unlock(&cam->lock);
768 return ret;
769}
770
771
772static __poll_t viacam_poll(struct file *filp, struct poll_table_struct *pt)
773{
774 struct via_camera *cam = video_drvdata(filp);
775
776 return videobuf_poll_stream(filp, &cam->vb_queue, pt);
777}
778
779
780static int viacam_mmap(struct file *filp, struct vm_area_struct *vma)
781{
782 struct via_camera *cam = video_drvdata(filp);
783
784 return videobuf_mmap_mapper(&cam->vb_queue, vma);
785}
786
787
788
789static const struct v4l2_file_operations viacam_fops = {
790 .owner = THIS_MODULE,
791 .open = viacam_open,
792 .release = viacam_release,
793 .read = viacam_read,
794 .poll = viacam_poll,
795 .mmap = viacam_mmap,
796 .unlocked_ioctl = video_ioctl2,
797};
798
799/*----------------------------------------------------------------------------*/
800/*
801 * The long list of v4l2 ioctl ops
802 */
803
804/*
805 * Only one input.
806 */
807static int viacam_enum_input(struct file *filp, void *priv,
808 struct v4l2_input *input)
809{
810 if (input->index != 0)
811 return -EINVAL;
812
813 input->type = V4L2_INPUT_TYPE_CAMERA;
814 input->std = V4L2_STD_ALL; /* Not sure what should go here */
815 strscpy(input->name, "Camera", sizeof(input->name));
816 return 0;
817}
818
819static int viacam_g_input(struct file *filp, void *priv, unsigned int *i)
820{
821 *i = 0;
822 return 0;
823}
824
825static int viacam_s_input(struct file *filp, void *priv, unsigned int i)
826{
827 if (i != 0)
828 return -EINVAL;
829 return 0;
830}
831
832static int viacam_s_std(struct file *filp, void *priv, v4l2_std_id std)
833{
834 return 0;
835}
836
837static int viacam_g_std(struct file *filp, void *priv, v4l2_std_id *std)
838{
839 *std = V4L2_STD_NTSC_M;
840 return 0;
841}
842
843/*
844 * Video format stuff. Here is our default format until
845 * user space messes with things.
846 */
847static const struct v4l2_pix_format viacam_def_pix_format = {
848 .width = VGA_WIDTH,
849 .height = VGA_HEIGHT,
850 .pixelformat = V4L2_PIX_FMT_YUYV,
851 .field = V4L2_FIELD_NONE,
852 .bytesperline = VGA_WIDTH * 2,
853 .sizeimage = VGA_WIDTH * VGA_HEIGHT * 2,
854};
855
856static const u32 via_def_mbus_code = MEDIA_BUS_FMT_YUYV8_2X8;
857
858static int viacam_enum_fmt_vid_cap(struct file *filp, void *priv,
859 struct v4l2_fmtdesc *fmt)
860{
861 if (fmt->index >= N_VIA_FMTS)
862 return -EINVAL;
863 strscpy(fmt->description, via_formats[fmt->index].desc,
864 sizeof(fmt->description));
865 fmt->pixelformat = via_formats[fmt->index].pixelformat;
866 return 0;
867}
868
869/*
870 * Figure out proper image dimensions, but always force the
871 * sensor to VGA.
872 */
873static void viacam_fmt_pre(struct v4l2_pix_format *userfmt,
874 struct v4l2_pix_format *sensorfmt)
875{
876 *sensorfmt = *userfmt;
877 if (userfmt->width < QCIF_WIDTH || userfmt->height < QCIF_HEIGHT) {
878 userfmt->width = QCIF_WIDTH;
879 userfmt->height = QCIF_HEIGHT;
880 }
881 if (userfmt->width > VGA_WIDTH || userfmt->height > VGA_HEIGHT) {
882 userfmt->width = VGA_WIDTH;
883 userfmt->height = VGA_HEIGHT;
884 }
885 sensorfmt->width = VGA_WIDTH;
886 sensorfmt->height = VGA_HEIGHT;
887}
888
889static void viacam_fmt_post(struct v4l2_pix_format *userfmt,
890 struct v4l2_pix_format *sensorfmt)
891{
892 struct via_format *f = via_find_format(userfmt->pixelformat);
893
894 sensorfmt->bytesperline = sensorfmt->width * f->bpp;
895 sensorfmt->sizeimage = sensorfmt->height * sensorfmt->bytesperline;
896 userfmt->pixelformat = sensorfmt->pixelformat;
897 userfmt->field = sensorfmt->field;
898 userfmt->bytesperline = 2 * userfmt->width;
899 userfmt->sizeimage = userfmt->bytesperline * userfmt->height;
900}
901
902
903/*
904 * The real work of figuring out a workable format.
905 */
906static int viacam_do_try_fmt(struct via_camera *cam,
907 struct v4l2_pix_format *upix, struct v4l2_pix_format *spix)
908{
909 int ret;
910 struct v4l2_subdev_pad_config pad_cfg;
911 struct v4l2_subdev_format format = {
912 .which = V4L2_SUBDEV_FORMAT_TRY,
913 };
914 struct via_format *f = via_find_format(upix->pixelformat);
915
916 upix->pixelformat = f->pixelformat;
917 viacam_fmt_pre(upix, spix);
918 v4l2_fill_mbus_format(&format.format, spix, f->mbus_code);
919 ret = sensor_call(cam, pad, set_fmt, &pad_cfg, &format);
920 v4l2_fill_pix_format(spix, &format.format);
921 viacam_fmt_post(upix, spix);
922 return ret;
923}
924
925
926
927static int viacam_try_fmt_vid_cap(struct file *filp, void *priv,
928 struct v4l2_format *fmt)
929{
930 struct via_camera *cam = priv;
931 struct v4l2_format sfmt;
932 int ret;
933
934 mutex_lock(&cam->lock);
935 ret = viacam_do_try_fmt(cam, &fmt->fmt.pix, &sfmt.fmt.pix);
936 mutex_unlock(&cam->lock);
937 return ret;
938}
939
940
941static int viacam_g_fmt_vid_cap(struct file *filp, void *priv,
942 struct v4l2_format *fmt)
943{
944 struct via_camera *cam = priv;
945
946 mutex_lock(&cam->lock);
947 fmt->fmt.pix = cam->user_format;
948 mutex_unlock(&cam->lock);
949 return 0;
950}
951
952static int viacam_s_fmt_vid_cap(struct file *filp, void *priv,
953 struct v4l2_format *fmt)
954{
955 struct via_camera *cam = priv;
956 int ret;
957 struct v4l2_format sfmt;
958 struct via_format *f = via_find_format(fmt->fmt.pix.pixelformat);
959
960 /*
961 * Camera must be idle or we can't mess with the
962 * video setup.
963 */
964 mutex_lock(&cam->lock);
965 if (cam->opstate != S_IDLE) {
966 ret = -EBUSY;
967 goto out;
968 }
969 /*
970 * Let the sensor code look over and tweak the
971 * requested formatting.
972 */
973 ret = viacam_do_try_fmt(cam, &fmt->fmt.pix, &sfmt.fmt.pix);
974 if (ret)
975 goto out;
976 /*
977 * OK, let's commit to the new format.
978 */
979 cam->user_format = fmt->fmt.pix;
980 cam->sensor_format = sfmt.fmt.pix;
981 cam->mbus_code = f->mbus_code;
982 ret = viacam_configure_sensor(cam);
983 if (!ret)
984 ret = viacam_config_controller(cam);
985out:
986 mutex_unlock(&cam->lock);
987 return ret;
988}
989
990static int viacam_querycap(struct file *filp, void *priv,
991 struct v4l2_capability *cap)
992{
993 strscpy(cap->driver, "via-camera", sizeof(cap->driver));
994 strscpy(cap->card, "via-camera", sizeof(cap->card));
995 cap->device_caps = V4L2_CAP_VIDEO_CAPTURE |
996 V4L2_CAP_READWRITE | V4L2_CAP_STREAMING;
997 cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
998 return 0;
999}
1000
1001/*
1002 * Streaming operations - pure videobuf stuff.
1003 */
1004static int viacam_reqbufs(struct file *filp, void *priv,
1005 struct v4l2_requestbuffers *rb)
1006{
1007 struct via_camera *cam = priv;
1008
1009 return videobuf_reqbufs(&cam->vb_queue, rb);
1010}
1011
1012static int viacam_querybuf(struct file *filp, void *priv,
1013 struct v4l2_buffer *buf)
1014{
1015 struct via_camera *cam = priv;
1016
1017 return videobuf_querybuf(&cam->vb_queue, buf);
1018}
1019
1020static int viacam_qbuf(struct file *filp, void *priv, struct v4l2_buffer *buf)
1021{
1022 struct via_camera *cam = priv;
1023
1024 return videobuf_qbuf(&cam->vb_queue, buf);
1025}
1026
1027static int viacam_dqbuf(struct file *filp, void *priv, struct v4l2_buffer *buf)
1028{
1029 struct via_camera *cam = priv;
1030
1031 return videobuf_dqbuf(&cam->vb_queue, buf, filp->f_flags & O_NONBLOCK);
1032}
1033
1034static int viacam_streamon(struct file *filp, void *priv, enum v4l2_buf_type t)
1035{
1036 struct via_camera *cam = priv;
1037 int ret = 0;
1038
1039 if (t != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1040 return -EINVAL;
1041
1042 mutex_lock(&cam->lock);
1043 if (cam->opstate != S_IDLE) {
1044 ret = -EBUSY;
1045 goto out;
1046 }
1047 /*
1048 * Enforce the V4l2 "only one owner gets to read data" rule.
1049 */
1050 if (cam->owner && cam->owner != filp) {
1051 ret = -EBUSY;
1052 goto out;
1053 }
1054 cam->owner = filp;
1055 /*
1056 * Configure things if need be.
1057 */
1058 if (test_bit(CF_CONFIG_NEEDED, &cam->flags)) {
1059 ret = viacam_configure_sensor(cam);
1060 if (ret)
1061 goto out;
1062 ret = viacam_config_controller(cam);
1063 if (ret)
1064 goto out;
1065 }
1066 /*
1067 * If the CPU goes into C3, the DMA transfer gets corrupted and
1068 * users start filing unsightly bug reports. Put in a "latency"
1069 * requirement which will keep the CPU out of the deeper sleep
1070 * states.
1071 */
1072 pm_qos_add_request(&cam->qos_request, PM_QOS_CPU_DMA_LATENCY, 50);
1073 /*
1074 * Fire things up.
1075 */
1076 INIT_LIST_HEAD(&cam->buffer_queue);
1077 ret = videobuf_streamon(&cam->vb_queue);
1078 if (!ret)
1079 viacam_start_engine(cam);
1080out:
1081 mutex_unlock(&cam->lock);
1082 return ret;
1083}
1084
1085static int viacam_streamoff(struct file *filp, void *priv, enum v4l2_buf_type t)
1086{
1087 struct via_camera *cam = priv;
1088 int ret;
1089
1090 if (t != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1091 return -EINVAL;
1092 mutex_lock(&cam->lock);
1093 if (cam->opstate != S_RUNNING) {
1094 ret = -EINVAL;
1095 goto out;
1096 }
1097 pm_qos_remove_request(&cam->qos_request);
1098 viacam_stop_engine(cam);
1099 /*
1100 * Videobuf will recycle all of the outstanding buffers, but
1101 * we should be sure we don't retain any references to
1102 * any of them.
1103 */
1104 ret = videobuf_streamoff(&cam->vb_queue);
1105 INIT_LIST_HEAD(&cam->buffer_queue);
1106out:
1107 mutex_unlock(&cam->lock);
1108 return ret;
1109}
1110
1111/* G/S_PARM */
1112
1113static int viacam_g_parm(struct file *filp, void *priv,
1114 struct v4l2_streamparm *parm)
1115{
1116 struct via_camera *cam = priv;
1117 int ret;
1118
1119 mutex_lock(&cam->lock);
1120 ret = v4l2_g_parm_cap(video_devdata(filp), cam->sensor, parm);
1121 mutex_unlock(&cam->lock);
1122 parm->parm.capture.readbuffers = cam->n_cap_bufs;
1123 return ret;
1124}
1125
1126static int viacam_s_parm(struct file *filp, void *priv,
1127 struct v4l2_streamparm *parm)
1128{
1129 struct via_camera *cam = priv;
1130 int ret;
1131
1132 mutex_lock(&cam->lock);
1133 ret = v4l2_s_parm_cap(video_devdata(filp), cam->sensor, parm);
1134 mutex_unlock(&cam->lock);
1135 parm->parm.capture.readbuffers = cam->n_cap_bufs;
1136 return ret;
1137}
1138
1139static int viacam_enum_framesizes(struct file *filp, void *priv,
1140 struct v4l2_frmsizeenum *sizes)
1141{
1142 if (sizes->index != 0)
1143 return -EINVAL;
1144 sizes->type = V4L2_FRMSIZE_TYPE_CONTINUOUS;
1145 sizes->stepwise.min_width = QCIF_WIDTH;
1146 sizes->stepwise.min_height = QCIF_HEIGHT;
1147 sizes->stepwise.max_width = VGA_WIDTH;
1148 sizes->stepwise.max_height = VGA_HEIGHT;
1149 sizes->stepwise.step_width = sizes->stepwise.step_height = 1;
1150 return 0;
1151}
1152
1153static int viacam_enum_frameintervals(struct file *filp, void *priv,
1154 struct v4l2_frmivalenum *interval)
1155{
1156 struct via_camera *cam = priv;
1157 struct v4l2_subdev_frame_interval_enum fie = {
1158 .index = interval->index,
1159 .code = cam->mbus_code,
1160 .width = cam->sensor_format.width,
1161 .height = cam->sensor_format.height,
1162 .which = V4L2_SUBDEV_FORMAT_ACTIVE,
1163 };
1164 int ret;
1165
1166 mutex_lock(&cam->lock);
1167 ret = sensor_call(cam, pad, enum_frame_interval, NULL, &fie);
1168 mutex_unlock(&cam->lock);
1169 if (ret)
1170 return ret;
1171 interval->type = V4L2_FRMIVAL_TYPE_DISCRETE;
1172 interval->discrete = fie.interval;
1173 return 0;
1174}
1175
1176
1177
1178static const struct v4l2_ioctl_ops viacam_ioctl_ops = {
1179 .vidioc_enum_input = viacam_enum_input,
1180 .vidioc_g_input = viacam_g_input,
1181 .vidioc_s_input = viacam_s_input,
1182 .vidioc_s_std = viacam_s_std,
1183 .vidioc_g_std = viacam_g_std,
1184 .vidioc_enum_fmt_vid_cap = viacam_enum_fmt_vid_cap,
1185 .vidioc_try_fmt_vid_cap = viacam_try_fmt_vid_cap,
1186 .vidioc_g_fmt_vid_cap = viacam_g_fmt_vid_cap,
1187 .vidioc_s_fmt_vid_cap = viacam_s_fmt_vid_cap,
1188 .vidioc_querycap = viacam_querycap,
1189 .vidioc_reqbufs = viacam_reqbufs,
1190 .vidioc_querybuf = viacam_querybuf,
1191 .vidioc_qbuf = viacam_qbuf,
1192 .vidioc_dqbuf = viacam_dqbuf,
1193 .vidioc_streamon = viacam_streamon,
1194 .vidioc_streamoff = viacam_streamoff,
1195 .vidioc_g_parm = viacam_g_parm,
1196 .vidioc_s_parm = viacam_s_parm,
1197 .vidioc_enum_framesizes = viacam_enum_framesizes,
1198 .vidioc_enum_frameintervals = viacam_enum_frameintervals,
1199};
1200
1201/*----------------------------------------------------------------------------*/
1202
1203/*
1204 * Power management.
1205 */
1206#ifdef CONFIG_PM
1207
1208static int viacam_suspend(void *priv)
1209{
1210 struct via_camera *cam = priv;
1211 enum viacam_opstate state = cam->opstate;
1212
1213 if (cam->opstate != S_IDLE) {
1214 viacam_stop_engine(cam);
1215 cam->opstate = state; /* So resume restarts */
1216 }
1217
1218 return 0;
1219}
1220
1221static int viacam_resume(void *priv)
1222{
1223 struct via_camera *cam = priv;
1224 int ret = 0;
1225
1226 /*
1227 * Get back to a reasonable operating state.
1228 */
1229 via_write_reg_mask(VIASR, 0x78, 0, 0x80);
1230 via_write_reg_mask(VIASR, 0x1e, 0xc0, 0xc0);
1231 viacam_int_disable(cam);
1232 set_bit(CF_CONFIG_NEEDED, &cam->flags);
1233 /*
1234 * Make sure the sensor's power state is correct
1235 */
1236 if (cam->users > 0)
1237 via_sensor_power_up(cam);
1238 else
1239 via_sensor_power_down(cam);
1240 /*
1241 * If it was operating, try to restart it.
1242 */
1243 if (cam->opstate != S_IDLE) {
1244 mutex_lock(&cam->lock);
1245 ret = viacam_configure_sensor(cam);
1246 if (!ret)
1247 ret = viacam_config_controller(cam);
1248 mutex_unlock(&cam->lock);
1249 if (!ret)
1250 viacam_start_engine(cam);
1251 }
1252
1253 return ret;
1254}
1255
1256static struct viafb_pm_hooks viacam_pm_hooks = {
1257 .suspend = viacam_suspend,
1258 .resume = viacam_resume
1259};
1260
1261#endif /* CONFIG_PM */
1262
1263/*
1264 * Setup stuff.
1265 */
1266
1267static const struct video_device viacam_v4l_template = {
1268 .name = "via-camera",
1269 .minor = -1,
1270 .tvnorms = V4L2_STD_NTSC_M,
1271 .fops = &viacam_fops,
1272 .ioctl_ops = &viacam_ioctl_ops,
1273 .release = video_device_release_empty, /* Check this */
1274};
1275
1276/*
1277 * The OLPC folks put the serial port on the same pin as
1278 * the camera. They also get grumpy if we break the
1279 * serial port and keep them from using it. So we have
1280 * to check the serial enable bit and not step on it.
1281 */
1282#define VIACAM_SERIAL_DEVFN 0x88
1283#define VIACAM_SERIAL_CREG 0x46
1284#define VIACAM_SERIAL_BIT 0x40
1285
1286static bool viacam_serial_is_enabled(void)
1287{
1288 struct pci_bus *pbus = pci_find_bus(0, 0);
1289 u8 cbyte;
1290
1291 if (!pbus)
1292 return false;
1293 pci_bus_read_config_byte(pbus, VIACAM_SERIAL_DEVFN,
1294 VIACAM_SERIAL_CREG, &cbyte);
1295 if ((cbyte & VIACAM_SERIAL_BIT) == 0)
1296 return false; /* Not enabled */
1297 if (!override_serial) {
1298 printk(KERN_NOTICE "Via camera: serial port is enabled, " \
1299 "refusing to load.\n");
1300 printk(KERN_NOTICE "Specify override_serial=1 to force " \
1301 "module loading.\n");
1302 return true;
1303 }
1304 printk(KERN_NOTICE "Via camera: overriding serial port\n");
1305 pci_bus_write_config_byte(pbus, VIACAM_SERIAL_DEVFN,
1306 VIACAM_SERIAL_CREG, cbyte & ~VIACAM_SERIAL_BIT);
1307 return false;
1308}
1309
1310static struct ov7670_config sensor_cfg = {
1311 /* The XO-1.5 (only known user) clocks the camera at 90MHz. */
1312 .clock_speed = 90,
1313};
1314
1315static int viacam_probe(struct platform_device *pdev)
1316{
1317 int ret;
1318 struct i2c_adapter *sensor_adapter;
1319 struct viafb_dev *viadev = pdev->dev.platform_data;
1320 struct i2c_board_info ov7670_info = {
1321 .type = "ov7670",
1322 .addr = 0x42 >> 1,
1323 .platform_data = &sensor_cfg,
1324 };
1325
1326 /*
1327 * Note that there are actually two capture channels on
1328 * the device. We only deal with one for now. That
1329 * is encoded here; nothing else assumes it's dealing with
1330 * a unique capture device.
1331 */
1332 struct via_camera *cam;
1333
1334 /*
1335 * Ensure that frame buffer memory has been set aside for
1336 * this purpose. As an arbitrary limit, refuse to work
1337 * with less than two frames of VGA 16-bit data.
1338 *
1339 * If we ever support the second port, we'll need to set
1340 * aside more memory.
1341 */
1342 if (viadev->camera_fbmem_size < (VGA_HEIGHT*VGA_WIDTH*4)) {
1343 printk(KERN_ERR "viacam: insufficient FB memory reserved\n");
1344 return -ENOMEM;
1345 }
1346 if (viadev->engine_mmio == NULL) {
1347 printk(KERN_ERR "viacam: No I/O memory, so no pictures\n");
1348 return -ENOMEM;
1349 }
1350
1351 if (machine_is_olpc() && viacam_serial_is_enabled())
1352 return -EBUSY;
1353
1354 /*
1355 * Basic structure initialization.
1356 */
1357 cam = kzalloc (sizeof(struct via_camera), GFP_KERNEL);
1358 if (cam == NULL)
1359 return -ENOMEM;
1360 via_cam_info = cam;
1361 cam->platdev = pdev;
1362 cam->viadev = viadev;
1363 cam->users = 0;
1364 cam->owner = NULL;
1365 cam->opstate = S_IDLE;
1366 cam->user_format = cam->sensor_format = viacam_def_pix_format;
1367 mutex_init(&cam->lock);
1368 INIT_LIST_HEAD(&cam->buffer_queue);
1369 cam->mmio = viadev->engine_mmio;
1370 cam->fbmem = viadev->fbmem;
1371 cam->fb_offset = viadev->camera_fbmem_offset;
1372 cam->flags = 1 << CF_CONFIG_NEEDED;
1373 cam->mbus_code = via_def_mbus_code;
1374 /*
1375 * Tell V4L that we exist.
1376 */
1377 ret = v4l2_device_register(&pdev->dev, &cam->v4l2_dev);
1378 if (ret) {
1379 dev_err(&pdev->dev, "Unable to register v4l2 device\n");
1380 goto out_free;
1381 }
1382 ret = v4l2_ctrl_handler_init(&cam->ctrl_handler, 10);
1383 if (ret)
1384 goto out_unregister;
1385 cam->v4l2_dev.ctrl_handler = &cam->ctrl_handler;
1386 /*
1387 * Convince the system that we can do DMA.
1388 */
1389 pdev->dev.dma_mask = &viadev->pdev->dma_mask;
1390 dma_set_mask(&pdev->dev, 0xffffffff);
1391 /*
1392 * Fire up the capture port. The write to 0x78 looks purely
1393 * OLPCish; any system will need to tweak 0x1e.
1394 */
1395 via_write_reg_mask(VIASR, 0x78, 0, 0x80);
1396 via_write_reg_mask(VIASR, 0x1e, 0xc0, 0xc0);
1397 /*
1398 * Get the sensor powered up.
1399 */
1400 ret = via_sensor_power_setup(cam);
1401 if (ret)
1402 goto out_ctrl_hdl_free;
1403 via_sensor_power_up(cam);
1404
1405 /*
1406 * See if we can't find it on the bus. The VIA_PORT_31 assumption
1407 * is OLPC-specific. 0x42 assumption is ov7670-specific.
1408 */
1409 sensor_adapter = viafb_find_i2c_adapter(VIA_PORT_31);
1410 cam->sensor = v4l2_i2c_new_subdev_board(&cam->v4l2_dev, sensor_adapter,
1411 &ov7670_info, NULL);
1412 if (cam->sensor == NULL) {
1413 dev_err(&pdev->dev, "Unable to find the sensor!\n");
1414 ret = -ENODEV;
1415 goto out_power_down;
1416 }
1417 /*
1418 * Get the IRQ.
1419 */
1420 viacam_int_disable(cam);
1421 ret = request_threaded_irq(viadev->pdev->irq, viacam_quick_irq,
1422 viacam_irq, IRQF_SHARED, "via-camera", cam);
1423 if (ret)
1424 goto out_power_down;
1425 /*
1426 * Tell V4l2 that we exist.
1427 */
1428 cam->vdev = viacam_v4l_template;
1429 cam->vdev.v4l2_dev = &cam->v4l2_dev;
1430 ret = video_register_device(&cam->vdev, VFL_TYPE_GRABBER, -1);
1431 if (ret)
1432 goto out_irq;
1433 video_set_drvdata(&cam->vdev, cam);
1434
1435#ifdef CONFIG_PM
1436 /*
1437 * Hook into PM events
1438 */
1439 viacam_pm_hooks.private = cam;
1440 viafb_pm_register(&viacam_pm_hooks);
1441#endif
1442
1443 /* Power the sensor down until somebody opens the device */
1444 via_sensor_power_down(cam);
1445 return 0;
1446
1447out_irq:
1448 free_irq(viadev->pdev->irq, cam);
1449out_power_down:
1450 via_sensor_power_release(cam);
1451out_ctrl_hdl_free:
1452 v4l2_ctrl_handler_free(&cam->ctrl_handler);
1453out_unregister:
1454 v4l2_device_unregister(&cam->v4l2_dev);
1455out_free:
1456 kfree(cam);
1457 return ret;
1458}
1459
1460static int viacam_remove(struct platform_device *pdev)
1461{
1462 struct via_camera *cam = via_cam_info;
1463 struct viafb_dev *viadev = pdev->dev.platform_data;
1464
1465 video_unregister_device(&cam->vdev);
1466 v4l2_device_unregister(&cam->v4l2_dev);
1467 free_irq(viadev->pdev->irq, cam);
1468 via_sensor_power_release(cam);
1469 v4l2_ctrl_handler_free(&cam->ctrl_handler);
1470 kfree(cam);
1471 via_cam_info = NULL;
1472 return 0;
1473}
1474
1475static struct platform_driver viacam_driver = {
1476 .driver = {
1477 .name = "viafb-camera",
1478 },
1479 .probe = viacam_probe,
1480 .remove = viacam_remove,
1481};
1482
1483module_platform_driver(viacam_driver);
1484