]>
Commit | Line | Data |
---|---|---|
024fafba JC |
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> | |
024fafba JC |
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-chip-ident.h> | |
21 | #include <media/videobuf-dma-sg.h> | |
024fafba JC |
22 | #include <linux/delay.h> |
23 | #include <linux/dma-mapping.h> | |
24 | #include <linux/pm_qos_params.h> | |
25 | #include <linux/via-core.h> | |
26 | #include <linux/via-gpio.h> | |
27 | #include <linux/via_i2c.h> | |
c6384c88 | 28 | #include <asm/olpc.h> |
024fafba JC |
29 | |
30 | #include "via-camera.h" | |
31 | ||
32 | MODULE_AUTHOR("Jonathan Corbet <corbet@lwn.net>"); | |
33 | MODULE_DESCRIPTION("VIA framebuffer-based camera controller driver"); | |
34 | MODULE_LICENSE("GPL"); | |
35 | ||
36 | static int flip_image; | |
37 | module_param(flip_image, bool, 0444); | |
38 | MODULE_PARM_DESC(flip_image, | |
39 | "If set, the sensor will be instructed to flip the image " | |
40 | "vertically."); | |
41 | ||
024fafba JC |
42 | static int override_serial; |
43 | module_param(override_serial, bool, 0444); | |
44 | MODULE_PARM_DESC(override_serial, | |
45 | "The camera driver will normally refuse to load if " | |
46 | "the XO 1.5 serial port is enabled. Set this option " | |
c6384c88 | 47 | "to force-enable the camera."); |
024fafba JC |
48 | |
49 | /* | |
50 | * Basic window sizes. | |
51 | */ | |
52 | #define VGA_WIDTH 640 | |
53 | #define VGA_HEIGHT 480 | |
54 | #define QCIF_WIDTH 176 | |
55 | #define QCIF_HEIGHT 144 | |
56 | ||
57 | /* | |
58 | * The structure describing our camera. | |
59 | */ | |
60 | enum viacam_opstate { S_IDLE = 0, S_RUNNING = 1 }; | |
61 | ||
62 | struct via_camera { | |
63 | struct v4l2_device v4l2_dev; | |
64 | struct video_device vdev; | |
65 | struct v4l2_subdev *sensor; | |
66 | struct platform_device *platdev; | |
67 | struct viafb_dev *viadev; | |
68 | struct mutex lock; | |
69 | enum viacam_opstate opstate; | |
70 | unsigned long flags; | |
71 | struct pm_qos_request_list qos_request; | |
72 | /* | |
73 | * GPIO info for power/reset management | |
74 | */ | |
75 | int power_gpio; | |
76 | int reset_gpio; | |
77 | /* | |
78 | * I/O memory stuff. | |
79 | */ | |
80 | void __iomem *mmio; /* Where the registers live */ | |
81 | void __iomem *fbmem; /* Frame buffer memory */ | |
82 | u32 fb_offset; /* Reserved memory offset (FB) */ | |
83 | /* | |
84 | * Capture buffers and related. The controller supports | |
85 | * up to three, so that's what we have here. These buffers | |
86 | * live in frame buffer memory, so we don't call them "DMA". | |
87 | */ | |
88 | unsigned int cb_offsets[3]; /* offsets into fb mem */ | |
89 | u8 *cb_addrs[3]; /* Kernel-space addresses */ | |
90 | int n_cap_bufs; /* How many are we using? */ | |
91 | int next_buf; | |
92 | struct videobuf_queue vb_queue; | |
93 | struct list_head buffer_queue; /* prot. by reg_lock */ | |
94 | /* | |
95 | * User tracking. | |
96 | */ | |
97 | int users; | |
98 | struct file *owner; | |
99 | /* | |
100 | * Video format information. sensor_format is kept in a form | |
101 | * that we can use to pass to the sensor. We always run the | |
102 | * sensor in VGA resolution, though, and let the controller | |
103 | * downscale things if need be. So we keep the "real* | |
104 | * dimensions separately. | |
105 | */ | |
106 | struct v4l2_pix_format sensor_format; | |
107 | struct v4l2_pix_format user_format; | |
108 | enum v4l2_mbus_pixelcode mbus_code; | |
109 | }; | |
110 | ||
111 | /* | |
112 | * Yes, this is a hack, but there's only going to be one of these | |
113 | * on any system we know of. | |
114 | */ | |
115 | static struct via_camera *via_cam_info; | |
116 | ||
117 | /* | |
118 | * Flag values, manipulated with bitops | |
119 | */ | |
120 | #define CF_DMA_ACTIVE 0 /* A frame is incoming */ | |
121 | #define CF_CONFIG_NEEDED 1 /* Must configure hardware */ | |
122 | ||
123 | ||
124 | /* | |
125 | * Nasty ugly v4l2 boilerplate. | |
126 | */ | |
127 | #define sensor_call(cam, optype, func, args...) \ | |
128 | v4l2_subdev_call(cam->sensor, optype, func, ##args) | |
129 | ||
130 | /* | |
131 | * Debugging and related. | |
132 | */ | |
133 | #define cam_err(cam, fmt, arg...) \ | |
134 | dev_err(&(cam)->platdev->dev, fmt, ##arg); | |
135 | #define cam_warn(cam, fmt, arg...) \ | |
136 | dev_warn(&(cam)->platdev->dev, fmt, ##arg); | |
137 | #define cam_dbg(cam, fmt, arg...) \ | |
138 | dev_dbg(&(cam)->platdev->dev, fmt, ##arg); | |
139 | ||
140 | /* | |
141 | * Format handling. This is ripped almost directly from Hans's changes | |
142 | * to cafe_ccic.c. It's a little unfortunate; until this change, we | |
143 | * didn't need to know anything about the format except its byte depth; | |
144 | * now this information must be managed at this level too. | |
145 | */ | |
146 | static struct via_format { | |
147 | __u8 *desc; | |
148 | __u32 pixelformat; | |
149 | int bpp; /* Bytes per pixel */ | |
150 | enum v4l2_mbus_pixelcode mbus_code; | |
151 | } via_formats[] = { | |
152 | { | |
153 | .desc = "YUYV 4:2:2", | |
154 | .pixelformat = V4L2_PIX_FMT_YUYV, | |
155 | .mbus_code = V4L2_MBUS_FMT_YUYV8_2X8, | |
156 | .bpp = 2, | |
157 | }, | |
158 | { | |
159 | .desc = "RGB 565", | |
160 | .pixelformat = V4L2_PIX_FMT_RGB565, | |
161 | .mbus_code = V4L2_MBUS_FMT_RGB565_2X8_LE, | |
162 | .bpp = 2, | |
163 | }, | |
164 | /* RGB444 and Bayer should be doable, but have never been | |
165 | tested with this driver. */ | |
166 | }; | |
167 | #define N_VIA_FMTS ARRAY_SIZE(via_formats) | |
168 | ||
169 | static struct via_format *via_find_format(u32 pixelformat) | |
170 | { | |
171 | unsigned i; | |
172 | ||
173 | for (i = 0; i < N_VIA_FMTS; i++) | |
174 | if (via_formats[i].pixelformat == pixelformat) | |
175 | return via_formats + i; | |
176 | /* Not found? Then return the first format. */ | |
177 | return via_formats; | |
178 | } | |
179 | ||
180 | ||
181 | /*--------------------------------------------------------------------------*/ | |
182 | /* | |
183 | * Sensor power/reset management. This piece is OLPC-specific for | |
184 | * sure; other configurations will have things connected differently. | |
185 | */ | |
186 | static int via_sensor_power_setup(struct via_camera *cam) | |
187 | { | |
188 | int ret; | |
189 | ||
190 | cam->power_gpio = viafb_gpio_lookup("VGPIO3"); | |
191 | cam->reset_gpio = viafb_gpio_lookup("VGPIO2"); | |
192 | if (cam->power_gpio < 0 || cam->reset_gpio < 0) { | |
193 | dev_err(&cam->platdev->dev, "Unable to find GPIO lines\n"); | |
194 | return -EINVAL; | |
195 | } | |
196 | ret = gpio_request(cam->power_gpio, "viafb-camera"); | |
197 | if (ret) { | |
198 | dev_err(&cam->platdev->dev, "Unable to request power GPIO\n"); | |
199 | return ret; | |
200 | } | |
201 | ret = gpio_request(cam->reset_gpio, "viafb-camera"); | |
202 | if (ret) { | |
203 | dev_err(&cam->platdev->dev, "Unable to request reset GPIO\n"); | |
204 | gpio_free(cam->power_gpio); | |
205 | return ret; | |
206 | } | |
207 | gpio_direction_output(cam->power_gpio, 0); | |
208 | gpio_direction_output(cam->reset_gpio, 0); | |
209 | return 0; | |
210 | } | |
211 | ||
212 | /* | |
213 | * Power up the sensor and perform the reset dance. | |
214 | */ | |
215 | static void via_sensor_power_up(struct via_camera *cam) | |
216 | { | |
217 | gpio_set_value(cam->power_gpio, 1); | |
218 | gpio_set_value(cam->reset_gpio, 0); | |
219 | msleep(20); /* Probably excessive */ | |
220 | gpio_set_value(cam->reset_gpio, 1); | |
221 | msleep(20); | |
222 | } | |
223 | ||
224 | static void via_sensor_power_down(struct via_camera *cam) | |
225 | { | |
226 | gpio_set_value(cam->power_gpio, 0); | |
227 | gpio_set_value(cam->reset_gpio, 0); | |
228 | } | |
229 | ||
230 | ||
231 | static void via_sensor_power_release(struct via_camera *cam) | |
232 | { | |
233 | via_sensor_power_down(cam); | |
234 | gpio_free(cam->power_gpio); | |
235 | gpio_free(cam->reset_gpio); | |
236 | } | |
237 | ||
238 | /* --------------------------------------------------------------------------*/ | |
239 | /* Sensor ops */ | |
240 | ||
241 | /* | |
242 | * Manage the ov7670 "flip" bit, which needs special help. | |
243 | */ | |
244 | static int viacam_set_flip(struct via_camera *cam) | |
245 | { | |
246 | struct v4l2_control ctrl; | |
247 | ||
248 | memset(&ctrl, 0, sizeof(ctrl)); | |
249 | ctrl.id = V4L2_CID_VFLIP; | |
250 | ctrl.value = flip_image; | |
251 | return sensor_call(cam, core, s_ctrl, &ctrl); | |
252 | } | |
253 | ||
254 | /* | |
255 | * Configure the sensor. It's up to the caller to ensure | |
256 | * that the camera is in the correct operating state. | |
257 | */ | |
258 | static int viacam_configure_sensor(struct via_camera *cam) | |
259 | { | |
260 | struct v4l2_mbus_framefmt mbus_fmt; | |
261 | int ret; | |
262 | ||
263 | v4l2_fill_mbus_format(&mbus_fmt, &cam->sensor_format, cam->mbus_code); | |
264 | ret = sensor_call(cam, core, init, 0); | |
265 | if (ret == 0) | |
266 | ret = sensor_call(cam, video, s_mbus_fmt, &mbus_fmt); | |
267 | /* | |
268 | * OV7670 does weird things if flip is set *before* format... | |
269 | */ | |
270 | if (ret == 0) | |
271 | ret = viacam_set_flip(cam); | |
272 | return ret; | |
273 | } | |
274 | ||
275 | ||
276 | ||
277 | /* --------------------------------------------------------------------------*/ | |
278 | /* | |
279 | * Some simple register accessors; they assume that the lock is held. | |
280 | * | |
281 | * Should we want to support the second capture engine, we could | |
282 | * hide the register difference by adding 0x1000 to registers in the | |
283 | * 0x300-350 range. | |
284 | */ | |
285 | static inline void viacam_write_reg(struct via_camera *cam, | |
286 | int reg, int value) | |
287 | { | |
288 | iowrite32(value, cam->mmio + reg); | |
289 | } | |
290 | ||
291 | static inline int viacam_read_reg(struct via_camera *cam, int reg) | |
292 | { | |
293 | return ioread32(cam->mmio + reg); | |
294 | } | |
295 | ||
296 | static inline void viacam_write_reg_mask(struct via_camera *cam, | |
297 | int reg, int value, int mask) | |
298 | { | |
299 | int tmp = viacam_read_reg(cam, reg); | |
300 | ||
301 | tmp = (tmp & ~mask) | (value & mask); | |
302 | viacam_write_reg(cam, reg, tmp); | |
303 | } | |
304 | ||
305 | ||
306 | /* --------------------------------------------------------------------------*/ | |
307 | /* Interrupt management and handling */ | |
308 | ||
309 | static irqreturn_t viacam_quick_irq(int irq, void *data) | |
310 | { | |
311 | struct via_camera *cam = data; | |
312 | irqreturn_t ret = IRQ_NONE; | |
313 | int icv; | |
314 | ||
315 | /* | |
316 | * All we do here is to clear the interrupts and tell | |
317 | * the handler thread to wake up. | |
318 | */ | |
319 | spin_lock(&cam->viadev->reg_lock); | |
320 | icv = viacam_read_reg(cam, VCR_INTCTRL); | |
321 | if (icv & VCR_IC_EAV) { | |
322 | icv |= VCR_IC_EAV|VCR_IC_EVBI|VCR_IC_FFULL; | |
323 | viacam_write_reg(cam, VCR_INTCTRL, icv); | |
324 | ret = IRQ_WAKE_THREAD; | |
325 | } | |
326 | spin_unlock(&cam->viadev->reg_lock); | |
327 | return ret; | |
328 | } | |
329 | ||
330 | /* | |
331 | * Find the next videobuf buffer which has somebody waiting on it. | |
332 | */ | |
333 | static struct videobuf_buffer *viacam_next_buffer(struct via_camera *cam) | |
334 | { | |
335 | unsigned long flags; | |
336 | struct videobuf_buffer *buf = NULL; | |
337 | ||
338 | spin_lock_irqsave(&cam->viadev->reg_lock, flags); | |
339 | if (cam->opstate != S_RUNNING) | |
340 | goto out; | |
341 | if (list_empty(&cam->buffer_queue)) | |
342 | goto out; | |
343 | buf = list_entry(cam->buffer_queue.next, struct videobuf_buffer, queue); | |
344 | if (!waitqueue_active(&buf->done)) {/* Nobody waiting */ | |
345 | buf = NULL; | |
346 | goto out; | |
347 | } | |
348 | list_del(&buf->queue); | |
349 | buf->state = VIDEOBUF_ACTIVE; | |
350 | out: | |
351 | spin_unlock_irqrestore(&cam->viadev->reg_lock, flags); | |
352 | return buf; | |
353 | } | |
354 | ||
355 | /* | |
356 | * The threaded IRQ handler. | |
357 | */ | |
358 | static irqreturn_t viacam_irq(int irq, void *data) | |
359 | { | |
360 | int bufn; | |
361 | struct videobuf_buffer *vb; | |
362 | struct via_camera *cam = data; | |
363 | struct videobuf_dmabuf *vdma; | |
364 | ||
365 | /* | |
366 | * If there is no place to put the data frame, don't bother | |
367 | * with anything else. | |
368 | */ | |
369 | vb = viacam_next_buffer(cam); | |
370 | if (vb == NULL) | |
371 | goto done; | |
372 | /* | |
373 | * Figure out which buffer we just completed. | |
374 | */ | |
375 | bufn = (viacam_read_reg(cam, VCR_INTCTRL) & VCR_IC_ACTBUF) >> 3; | |
376 | bufn -= 1; | |
377 | if (bufn < 0) | |
378 | bufn = cam->n_cap_bufs - 1; | |
379 | /* | |
380 | * Copy over the data and let any waiters know. | |
381 | */ | |
382 | vdma = videobuf_to_dma(vb); | |
383 | viafb_dma_copy_out_sg(cam->cb_offsets[bufn], vdma->sglist, vdma->sglen); | |
384 | vb->state = VIDEOBUF_DONE; | |
385 | vb->size = cam->user_format.sizeimage; | |
386 | wake_up(&vb->done); | |
387 | done: | |
388 | return IRQ_HANDLED; | |
389 | } | |
390 | ||
391 | ||
392 | /* | |
393 | * These functions must mess around with the general interrupt | |
394 | * control register, which is relevant to much more than just the | |
395 | * camera. Nothing else uses interrupts, though, as of this writing. | |
396 | * Should that situation change, we'll have to improve support at | |
397 | * the via-core level. | |
398 | */ | |
399 | static void viacam_int_enable(struct via_camera *cam) | |
400 | { | |
401 | viacam_write_reg(cam, VCR_INTCTRL, | |
402 | VCR_IC_INTEN|VCR_IC_EAV|VCR_IC_EVBI|VCR_IC_FFULL); | |
403 | viafb_irq_enable(VDE_I_C0AVEN); | |
404 | } | |
405 | ||
406 | static void viacam_int_disable(struct via_camera *cam) | |
407 | { | |
408 | viafb_irq_disable(VDE_I_C0AVEN); | |
409 | viacam_write_reg(cam, VCR_INTCTRL, 0); | |
410 | } | |
411 | ||
412 | ||
413 | ||
414 | /* --------------------------------------------------------------------------*/ | |
415 | /* Controller operations */ | |
416 | ||
417 | /* | |
418 | * Set up our capture buffers in framebuffer memory. | |
419 | */ | |
420 | static int viacam_ctlr_cbufs(struct via_camera *cam) | |
421 | { | |
422 | int nbuf = cam->viadev->camera_fbmem_size/cam->sensor_format.sizeimage; | |
423 | int i; | |
424 | unsigned int offset; | |
425 | ||
426 | /* | |
427 | * See how many buffers we can work with. | |
428 | */ | |
429 | if (nbuf >= 3) { | |
430 | cam->n_cap_bufs = 3; | |
431 | viacam_write_reg_mask(cam, VCR_CAPINTC, VCR_CI_3BUFS, | |
432 | VCR_CI_3BUFS); | |
433 | } else if (nbuf == 2) { | |
434 | cam->n_cap_bufs = 2; | |
435 | viacam_write_reg_mask(cam, VCR_CAPINTC, 0, VCR_CI_3BUFS); | |
436 | } else { | |
437 | cam_warn(cam, "Insufficient frame buffer memory\n"); | |
438 | return -ENOMEM; | |
439 | } | |
440 | /* | |
441 | * Set them up. | |
442 | */ | |
443 | offset = cam->fb_offset; | |
444 | for (i = 0; i < cam->n_cap_bufs; i++) { | |
445 | cam->cb_offsets[i] = offset; | |
446 | cam->cb_addrs[i] = cam->fbmem + offset; | |
447 | viacam_write_reg(cam, VCR_VBUF1 + i*4, offset & VCR_VBUF_MASK); | |
448 | offset += cam->sensor_format.sizeimage; | |
449 | } | |
450 | return 0; | |
451 | } | |
452 | ||
453 | /* | |
454 | * Set the scaling register for downscaling the image. | |
455 | * | |
456 | * This register works like this... Vertical scaling is enabled | |
457 | * by bit 26; if that bit is set, downscaling is controlled by the | |
458 | * value in bits 16:25. Those bits are divided by 1024 to get | |
459 | * the scaling factor; setting just bit 25 thus cuts the height | |
460 | * in half. | |
461 | * | |
462 | * Horizontal scaling works about the same, but it's enabled by | |
463 | * bit 11, with bits 0:10 giving the numerator of a fraction | |
464 | * (over 2048) for the scaling value. | |
465 | * | |
466 | * This function is naive in that, if the user departs from | |
467 | * the 3x4 VGA scaling factor, the image will distort. We | |
468 | * could work around that if it really seemed important. | |
469 | */ | |
470 | static void viacam_set_scale(struct via_camera *cam) | |
471 | { | |
472 | unsigned int avscale; | |
473 | int sf; | |
474 | ||
475 | if (cam->user_format.width == VGA_WIDTH) | |
476 | avscale = 0; | |
477 | else { | |
478 | sf = (cam->user_format.width*2048)/VGA_WIDTH; | |
479 | avscale = VCR_AVS_HEN | sf; | |
480 | } | |
481 | if (cam->user_format.height < VGA_HEIGHT) { | |
482 | sf = (1024*cam->user_format.height)/VGA_HEIGHT; | |
483 | avscale |= VCR_AVS_VEN | (sf << 16); | |
484 | } | |
485 | viacam_write_reg(cam, VCR_AVSCALE, avscale); | |
486 | } | |
487 | ||
488 | ||
489 | /* | |
490 | * Configure image-related information into the capture engine. | |
491 | */ | |
492 | static void viacam_ctlr_image(struct via_camera *cam) | |
493 | { | |
494 | int cicreg; | |
495 | ||
496 | /* | |
497 | * Disable clock before messing with stuff - from the via | |
498 | * sample driver. | |
499 | */ | |
500 | viacam_write_reg(cam, VCR_CAPINTC, ~(VCR_CI_ENABLE|VCR_CI_CLKEN)); | |
501 | /* | |
502 | * Set up the controller for VGA resolution, modulo magic | |
503 | * offsets from the via sample driver. | |
504 | */ | |
505 | viacam_write_reg(cam, VCR_HORRANGE, 0x06200120); | |
506 | viacam_write_reg(cam, VCR_VERTRANGE, 0x01de0000); | |
507 | viacam_set_scale(cam); | |
508 | /* | |
509 | * Image size info. | |
510 | */ | |
511 | viacam_write_reg(cam, VCR_MAXDATA, | |
512 | (cam->sensor_format.height << 16) | | |
513 | (cam->sensor_format.bytesperline >> 3)); | |
514 | viacam_write_reg(cam, VCR_MAXVBI, 0); | |
515 | viacam_write_reg(cam, VCR_VSTRIDE, | |
516 | cam->user_format.bytesperline & VCR_VS_STRIDE); | |
517 | /* | |
518 | * Set up the capture interface control register, | |
519 | * everything but the "go" bit. | |
520 | * | |
521 | * The FIFO threshold is a bit of a magic number; 8 is what | |
522 | * VIA's sample code uses. | |
523 | */ | |
524 | cicreg = VCR_CI_CLKEN | | |
525 | 0x08000000 | /* FIFO threshold */ | |
526 | VCR_CI_FLDINV | /* OLPC-specific? */ | |
527 | VCR_CI_VREFINV | /* OLPC-specific? */ | |
528 | VCR_CI_DIBOTH | /* Capture both fields */ | |
529 | VCR_CI_CCIR601_8; | |
530 | if (cam->n_cap_bufs == 3) | |
531 | cicreg |= VCR_CI_3BUFS; | |
532 | /* | |
533 | * YUV formats need different byte swapping than RGB. | |
534 | */ | |
535 | if (cam->user_format.pixelformat == V4L2_PIX_FMT_YUYV) | |
536 | cicreg |= VCR_CI_YUYV; | |
537 | else | |
538 | cicreg |= VCR_CI_UYVY; | |
539 | viacam_write_reg(cam, VCR_CAPINTC, cicreg); | |
540 | } | |
541 | ||
542 | ||
543 | static int viacam_config_controller(struct via_camera *cam) | |
544 | { | |
545 | int ret; | |
546 | unsigned long flags; | |
547 | ||
548 | spin_lock_irqsave(&cam->viadev->reg_lock, flags); | |
549 | ret = viacam_ctlr_cbufs(cam); | |
550 | if (!ret) | |
551 | viacam_ctlr_image(cam); | |
552 | spin_unlock_irqrestore(&cam->viadev->reg_lock, flags); | |
553 | clear_bit(CF_CONFIG_NEEDED, &cam->flags); | |
554 | return ret; | |
555 | } | |
556 | ||
557 | /* | |
558 | * Make it start grabbing data. | |
559 | */ | |
560 | static void viacam_start_engine(struct via_camera *cam) | |
561 | { | |
562 | spin_lock_irq(&cam->viadev->reg_lock); | |
563 | cam->next_buf = 0; | |
564 | viacam_write_reg_mask(cam, VCR_CAPINTC, VCR_CI_ENABLE, VCR_CI_ENABLE); | |
565 | viacam_int_enable(cam); | |
566 | (void) viacam_read_reg(cam, VCR_CAPINTC); /* Force post */ | |
567 | cam->opstate = S_RUNNING; | |
568 | spin_unlock_irq(&cam->viadev->reg_lock); | |
569 | } | |
570 | ||
571 | ||
572 | static void viacam_stop_engine(struct via_camera *cam) | |
573 | { | |
574 | spin_lock_irq(&cam->viadev->reg_lock); | |
575 | viacam_int_disable(cam); | |
576 | viacam_write_reg_mask(cam, VCR_CAPINTC, 0, VCR_CI_ENABLE); | |
577 | (void) viacam_read_reg(cam, VCR_CAPINTC); /* Force post */ | |
578 | cam->opstate = S_IDLE; | |
579 | spin_unlock_irq(&cam->viadev->reg_lock); | |
580 | } | |
581 | ||
582 | ||
583 | /* --------------------------------------------------------------------------*/ | |
584 | /* Videobuf callback ops */ | |
585 | ||
586 | /* | |
587 | * buffer_setup. The purpose of this one would appear to be to tell | |
588 | * videobuf how big a single image is. It's also evidently up to us | |
589 | * to put some sort of limit on the maximum number of buffers allowed. | |
590 | */ | |
591 | static int viacam_vb_buf_setup(struct videobuf_queue *q, | |
592 | unsigned int *count, unsigned int *size) | |
593 | { | |
594 | struct via_camera *cam = q->priv_data; | |
595 | ||
596 | *size = cam->user_format.sizeimage; | |
597 | if (*count == 0 || *count > 6) /* Arbitrary number */ | |
598 | *count = 6; | |
599 | return 0; | |
600 | } | |
601 | ||
602 | /* | |
603 | * Prepare a buffer. | |
604 | */ | |
605 | static int viacam_vb_buf_prepare(struct videobuf_queue *q, | |
606 | struct videobuf_buffer *vb, enum v4l2_field field) | |
607 | { | |
608 | struct via_camera *cam = q->priv_data; | |
609 | ||
610 | vb->size = cam->user_format.sizeimage; | |
611 | vb->width = cam->user_format.width; /* bytesperline???? */ | |
612 | vb->height = cam->user_format.height; | |
613 | vb->field = field; | |
614 | if (vb->state == VIDEOBUF_NEEDS_INIT) { | |
615 | int ret = videobuf_iolock(q, vb, NULL); | |
616 | if (ret) | |
617 | return ret; | |
618 | } | |
619 | vb->state = VIDEOBUF_PREPARED; | |
620 | return 0; | |
621 | } | |
622 | ||
623 | /* | |
624 | * We've got a buffer to put data into. | |
625 | * | |
626 | * FIXME: check for a running engine and valid buffers? | |
627 | */ | |
628 | static void viacam_vb_buf_queue(struct videobuf_queue *q, | |
629 | struct videobuf_buffer *vb) | |
630 | { | |
631 | struct via_camera *cam = q->priv_data; | |
632 | ||
633 | /* | |
634 | * Note that videobuf holds the lock when it calls | |
635 | * us, so we need not (indeed, cannot) take it here. | |
636 | */ | |
637 | vb->state = VIDEOBUF_QUEUED; | |
638 | list_add_tail(&vb->queue, &cam->buffer_queue); | |
639 | } | |
640 | ||
641 | /* | |
642 | * Free a buffer. | |
643 | */ | |
644 | static void viacam_vb_buf_release(struct videobuf_queue *q, | |
645 | struct videobuf_buffer *vb) | |
646 | { | |
647 | struct via_camera *cam = q->priv_data; | |
648 | ||
649 | videobuf_dma_unmap(&cam->platdev->dev, videobuf_to_dma(vb)); | |
650 | videobuf_dma_free(videobuf_to_dma(vb)); | |
651 | vb->state = VIDEOBUF_NEEDS_INIT; | |
652 | } | |
653 | ||
654 | static const struct videobuf_queue_ops viacam_vb_ops = { | |
655 | .buf_setup = viacam_vb_buf_setup, | |
656 | .buf_prepare = viacam_vb_buf_prepare, | |
657 | .buf_queue = viacam_vb_buf_queue, | |
658 | .buf_release = viacam_vb_buf_release, | |
659 | }; | |
660 | ||
661 | /* --------------------------------------------------------------------------*/ | |
662 | /* File operations */ | |
663 | ||
664 | static int viacam_open(struct file *filp) | |
665 | { | |
666 | struct via_camera *cam = video_drvdata(filp); | |
667 | ||
668 | filp->private_data = cam; | |
669 | /* | |
670 | * Note the new user. If this is the first one, we'll also | |
671 | * need to power up the sensor. | |
672 | */ | |
673 | mutex_lock(&cam->lock); | |
674 | if (cam->users == 0) { | |
675 | int ret = viafb_request_dma(); | |
676 | ||
677 | if (ret) { | |
678 | mutex_unlock(&cam->lock); | |
679 | return ret; | |
680 | } | |
681 | via_sensor_power_up(cam); | |
682 | set_bit(CF_CONFIG_NEEDED, &cam->flags); | |
683 | /* | |
684 | * Hook into videobuf. Evidently this cannot fail. | |
685 | */ | |
686 | videobuf_queue_sg_init(&cam->vb_queue, &viacam_vb_ops, | |
687 | &cam->platdev->dev, &cam->viadev->reg_lock, | |
688 | V4L2_BUF_TYPE_VIDEO_CAPTURE, V4L2_FIELD_NONE, | |
689 | sizeof(struct videobuf_buffer), cam, NULL); | |
690 | } | |
691 | (cam->users)++; | |
692 | mutex_unlock(&cam->lock); | |
693 | return 0; | |
694 | } | |
695 | ||
696 | static int viacam_release(struct file *filp) | |
697 | { | |
698 | struct via_camera *cam = video_drvdata(filp); | |
699 | ||
700 | mutex_lock(&cam->lock); | |
701 | (cam->users)--; | |
702 | /* | |
703 | * If the "owner" is closing, shut down any ongoing | |
704 | * operations. | |
705 | */ | |
706 | if (filp == cam->owner) { | |
707 | videobuf_stop(&cam->vb_queue); | |
708 | /* | |
709 | * We don't hold the spinlock here, but, if release() | |
710 | * is being called by the owner, nobody else will | |
711 | * be changing the state. And an extra stop would | |
712 | * not hurt anyway. | |
713 | */ | |
714 | if (cam->opstate != S_IDLE) | |
715 | viacam_stop_engine(cam); | |
716 | cam->owner = NULL; | |
717 | } | |
718 | /* | |
719 | * Last one out needs to turn out the lights. | |
720 | */ | |
721 | if (cam->users == 0) { | |
722 | videobuf_mmap_free(&cam->vb_queue); | |
723 | via_sensor_power_down(cam); | |
724 | viafb_release_dma(); | |
725 | } | |
726 | mutex_unlock(&cam->lock); | |
727 | return 0; | |
728 | } | |
729 | ||
730 | /* | |
731 | * Read a frame from the device. | |
732 | */ | |
733 | static ssize_t viacam_read(struct file *filp, char __user *buffer, | |
734 | size_t len, loff_t *pos) | |
735 | { | |
736 | struct via_camera *cam = video_drvdata(filp); | |
737 | int ret; | |
738 | ||
739 | mutex_lock(&cam->lock); | |
740 | /* | |
741 | * Enforce the V4l2 "only one owner gets to read data" rule. | |
742 | */ | |
743 | if (cam->owner && cam->owner != filp) { | |
744 | ret = -EBUSY; | |
745 | goto out_unlock; | |
746 | } | |
747 | cam->owner = filp; | |
748 | /* | |
749 | * Do we need to configure the hardware? | |
750 | */ | |
751 | if (test_bit(CF_CONFIG_NEEDED, &cam->flags)) { | |
752 | ret = viacam_configure_sensor(cam); | |
753 | if (!ret) | |
754 | ret = viacam_config_controller(cam); | |
755 | if (ret) | |
756 | goto out_unlock; | |
757 | } | |
758 | /* | |
759 | * Fire up the capture engine, then have videobuf do | |
760 | * the heavy lifting. Someday it would be good to avoid | |
761 | * stopping and restarting the engine each time. | |
762 | */ | |
763 | INIT_LIST_HEAD(&cam->buffer_queue); | |
764 | viacam_start_engine(cam); | |
765 | ret = videobuf_read_stream(&cam->vb_queue, buffer, len, pos, 0, | |
766 | filp->f_flags & O_NONBLOCK); | |
767 | viacam_stop_engine(cam); | |
768 | /* videobuf_stop() ?? */ | |
769 | ||
770 | out_unlock: | |
771 | mutex_unlock(&cam->lock); | |
772 | return ret; | |
773 | } | |
774 | ||
775 | ||
776 | static unsigned int viacam_poll(struct file *filp, struct poll_table_struct *pt) | |
777 | { | |
778 | struct via_camera *cam = video_drvdata(filp); | |
779 | ||
780 | return videobuf_poll_stream(filp, &cam->vb_queue, pt); | |
781 | } | |
782 | ||
783 | ||
784 | static int viacam_mmap(struct file *filp, struct vm_area_struct *vma) | |
785 | { | |
786 | struct via_camera *cam = video_drvdata(filp); | |
787 | ||
788 | return videobuf_mmap_mapper(&cam->vb_queue, vma); | |
789 | } | |
790 | ||
791 | ||
792 | ||
793 | static const struct v4l2_file_operations viacam_fops = { | |
794 | .owner = THIS_MODULE, | |
795 | .open = viacam_open, | |
796 | .release = viacam_release, | |
797 | .read = viacam_read, | |
798 | .poll = viacam_poll, | |
799 | .mmap = viacam_mmap, | |
800 | .unlocked_ioctl = video_ioctl2, | |
801 | }; | |
802 | ||
803 | /*----------------------------------------------------------------------------*/ | |
804 | /* | |
805 | * The long list of v4l2 ioctl ops | |
806 | */ | |
807 | ||
808 | static int viacam_g_chip_ident(struct file *file, void *priv, | |
809 | struct v4l2_dbg_chip_ident *ident) | |
810 | { | |
811 | struct via_camera *cam = priv; | |
812 | ||
813 | ident->ident = V4L2_IDENT_NONE; | |
814 | ident->revision = 0; | |
815 | if (v4l2_chip_match_host(&ident->match)) { | |
816 | ident->ident = V4L2_IDENT_VIA_VX855; | |
817 | return 0; | |
818 | } | |
819 | return sensor_call(cam, core, g_chip_ident, ident); | |
820 | } | |
821 | ||
822 | /* | |
823 | * Control ops are passed through to the sensor. | |
824 | */ | |
825 | static int viacam_queryctrl(struct file *filp, void *priv, | |
826 | struct v4l2_queryctrl *qc) | |
827 | { | |
828 | struct via_camera *cam = priv; | |
829 | int ret; | |
830 | ||
831 | mutex_lock(&cam->lock); | |
832 | ret = sensor_call(cam, core, queryctrl, qc); | |
833 | mutex_unlock(&cam->lock); | |
834 | return ret; | |
835 | } | |
836 | ||
837 | ||
838 | static int viacam_g_ctrl(struct file *filp, void *priv, | |
839 | struct v4l2_control *ctrl) | |
840 | { | |
841 | struct via_camera *cam = priv; | |
842 | int ret; | |
843 | ||
844 | mutex_lock(&cam->lock); | |
845 | ret = sensor_call(cam, core, g_ctrl, ctrl); | |
846 | mutex_unlock(&cam->lock); | |
847 | return ret; | |
848 | } | |
849 | ||
850 | ||
851 | static int viacam_s_ctrl(struct file *filp, void *priv, | |
852 | struct v4l2_control *ctrl) | |
853 | { | |
854 | struct via_camera *cam = priv; | |
855 | int ret; | |
856 | ||
857 | mutex_lock(&cam->lock); | |
858 | ret = sensor_call(cam, core, s_ctrl, ctrl); | |
859 | mutex_unlock(&cam->lock); | |
860 | return ret; | |
861 | } | |
862 | ||
863 | /* | |
864 | * Only one input. | |
865 | */ | |
866 | static int viacam_enum_input(struct file *filp, void *priv, | |
867 | struct v4l2_input *input) | |
868 | { | |
869 | if (input->index != 0) | |
870 | return -EINVAL; | |
871 | ||
872 | input->type = V4L2_INPUT_TYPE_CAMERA; | |
873 | input->std = V4L2_STD_ALL; /* Not sure what should go here */ | |
874 | strcpy(input->name, "Camera"); | |
875 | return 0; | |
876 | } | |
877 | ||
878 | static int viacam_g_input(struct file *filp, void *priv, unsigned int *i) | |
879 | { | |
880 | *i = 0; | |
881 | return 0; | |
882 | } | |
883 | ||
884 | static int viacam_s_input(struct file *filp, void *priv, unsigned int i) | |
885 | { | |
886 | if (i != 0) | |
887 | return -EINVAL; | |
888 | return 0; | |
889 | } | |
890 | ||
891 | static int viacam_s_std(struct file *filp, void *priv, v4l2_std_id *std) | |
892 | { | |
893 | return 0; | |
894 | } | |
895 | ||
896 | /* | |
897 | * Video format stuff. Here is our default format until | |
898 | * user space messes with things. | |
899 | */ | |
900 | static const struct v4l2_pix_format viacam_def_pix_format = { | |
901 | .width = VGA_WIDTH, | |
902 | .height = VGA_HEIGHT, | |
903 | .pixelformat = V4L2_PIX_FMT_YUYV, | |
904 | .field = V4L2_FIELD_NONE, | |
905 | .bytesperline = VGA_WIDTH * 2, | |
906 | .sizeimage = VGA_WIDTH * VGA_HEIGHT * 2, | |
907 | }; | |
908 | ||
909 | static const enum v4l2_mbus_pixelcode via_def_mbus_code = V4L2_MBUS_FMT_YUYV8_2X8; | |
910 | ||
911 | static int viacam_enum_fmt_vid_cap(struct file *filp, void *priv, | |
912 | struct v4l2_fmtdesc *fmt) | |
913 | { | |
914 | if (fmt->index >= N_VIA_FMTS) | |
915 | return -EINVAL; | |
916 | strlcpy(fmt->description, via_formats[fmt->index].desc, | |
917 | sizeof(fmt->description)); | |
918 | fmt->pixelformat = via_formats[fmt->index].pixelformat; | |
919 | return 0; | |
920 | } | |
921 | ||
922 | /* | |
923 | * Figure out proper image dimensions, but always force the | |
924 | * sensor to VGA. | |
925 | */ | |
926 | static void viacam_fmt_pre(struct v4l2_pix_format *userfmt, | |
927 | struct v4l2_pix_format *sensorfmt) | |
928 | { | |
929 | *sensorfmt = *userfmt; | |
930 | if (userfmt->width < QCIF_WIDTH || userfmt->height < QCIF_HEIGHT) { | |
931 | userfmt->width = QCIF_WIDTH; | |
932 | userfmt->height = QCIF_HEIGHT; | |
933 | } | |
934 | if (userfmt->width > VGA_WIDTH || userfmt->height > VGA_HEIGHT) { | |
935 | userfmt->width = VGA_WIDTH; | |
936 | userfmt->height = VGA_HEIGHT; | |
937 | } | |
938 | sensorfmt->width = VGA_WIDTH; | |
939 | sensorfmt->height = VGA_HEIGHT; | |
940 | } | |
941 | ||
942 | static void viacam_fmt_post(struct v4l2_pix_format *userfmt, | |
943 | struct v4l2_pix_format *sensorfmt) | |
944 | { | |
945 | struct via_format *f = via_find_format(userfmt->pixelformat); | |
946 | ||
947 | sensorfmt->bytesperline = sensorfmt->width * f->bpp; | |
948 | sensorfmt->sizeimage = sensorfmt->height * sensorfmt->bytesperline; | |
949 | userfmt->pixelformat = sensorfmt->pixelformat; | |
950 | userfmt->field = sensorfmt->field; | |
951 | userfmt->bytesperline = 2 * userfmt->width; | |
952 | userfmt->sizeimage = userfmt->bytesperline * userfmt->height; | |
953 | } | |
954 | ||
955 | ||
956 | /* | |
957 | * The real work of figuring out a workable format. | |
958 | */ | |
959 | static int viacam_do_try_fmt(struct via_camera *cam, | |
960 | struct v4l2_pix_format *upix, struct v4l2_pix_format *spix) | |
961 | { | |
962 | int ret; | |
963 | struct v4l2_mbus_framefmt mbus_fmt; | |
964 | struct via_format *f = via_find_format(upix->pixelformat); | |
965 | ||
966 | upix->pixelformat = f->pixelformat; | |
967 | viacam_fmt_pre(upix, spix); | |
968 | v4l2_fill_mbus_format(&mbus_fmt, upix, f->mbus_code); | |
969 | ret = sensor_call(cam, video, try_mbus_fmt, &mbus_fmt); | |
970 | v4l2_fill_pix_format(spix, &mbus_fmt); | |
971 | viacam_fmt_post(upix, spix); | |
972 | return ret; | |
973 | } | |
974 | ||
975 | ||
976 | ||
977 | static int viacam_try_fmt_vid_cap(struct file *filp, void *priv, | |
978 | struct v4l2_format *fmt) | |
979 | { | |
980 | struct via_camera *cam = priv; | |
981 | struct v4l2_format sfmt; | |
982 | int ret; | |
983 | ||
984 | mutex_lock(&cam->lock); | |
985 | ret = viacam_do_try_fmt(cam, &fmt->fmt.pix, &sfmt.fmt.pix); | |
986 | mutex_unlock(&cam->lock); | |
987 | return ret; | |
988 | } | |
989 | ||
990 | ||
991 | static int viacam_g_fmt_vid_cap(struct file *filp, void *priv, | |
992 | struct v4l2_format *fmt) | |
993 | { | |
994 | struct via_camera *cam = priv; | |
995 | ||
996 | mutex_lock(&cam->lock); | |
997 | fmt->fmt.pix = cam->user_format; | |
998 | mutex_unlock(&cam->lock); | |
999 | return 0; | |
1000 | } | |
1001 | ||
1002 | static int viacam_s_fmt_vid_cap(struct file *filp, void *priv, | |
1003 | struct v4l2_format *fmt) | |
1004 | { | |
1005 | struct via_camera *cam = priv; | |
1006 | int ret; | |
1007 | struct v4l2_format sfmt; | |
1008 | struct via_format *f = via_find_format(fmt->fmt.pix.pixelformat); | |
1009 | ||
1010 | /* | |
1011 | * Camera must be idle or we can't mess with the | |
1012 | * video setup. | |
1013 | */ | |
1014 | mutex_lock(&cam->lock); | |
1015 | if (cam->opstate != S_IDLE) { | |
1016 | ret = -EBUSY; | |
1017 | goto out; | |
1018 | } | |
1019 | /* | |
1020 | * Let the sensor code look over and tweak the | |
1021 | * requested formatting. | |
1022 | */ | |
1023 | ret = viacam_do_try_fmt(cam, &fmt->fmt.pix, &sfmt.fmt.pix); | |
1024 | if (ret) | |
1025 | goto out; | |
1026 | /* | |
1027 | * OK, let's commit to the new format. | |
1028 | */ | |
1029 | cam->user_format = fmt->fmt.pix; | |
1030 | cam->sensor_format = sfmt.fmt.pix; | |
1031 | cam->mbus_code = f->mbus_code; | |
1032 | ret = viacam_configure_sensor(cam); | |
1033 | if (!ret) | |
1034 | ret = viacam_config_controller(cam); | |
1035 | out: | |
1036 | mutex_unlock(&cam->lock); | |
1037 | return ret; | |
1038 | } | |
1039 | ||
1040 | static int viacam_querycap(struct file *filp, void *priv, | |
1041 | struct v4l2_capability *cap) | |
1042 | { | |
1043 | strcpy(cap->driver, "via-camera"); | |
1044 | strcpy(cap->card, "via-camera"); | |
1045 | cap->version = 1; | |
1046 | cap->capabilities = V4L2_CAP_VIDEO_CAPTURE | | |
1047 | V4L2_CAP_READWRITE | V4L2_CAP_STREAMING; | |
1048 | return 0; | |
1049 | } | |
1050 | ||
1051 | /* | |
1052 | * Streaming operations - pure videobuf stuff. | |
1053 | */ | |
1054 | static int viacam_reqbufs(struct file *filp, void *priv, | |
1055 | struct v4l2_requestbuffers *rb) | |
1056 | { | |
1057 | struct via_camera *cam = priv; | |
1058 | ||
1059 | return videobuf_reqbufs(&cam->vb_queue, rb); | |
1060 | } | |
1061 | ||
1062 | static int viacam_querybuf(struct file *filp, void *priv, | |
1063 | struct v4l2_buffer *buf) | |
1064 | { | |
1065 | struct via_camera *cam = priv; | |
1066 | ||
1067 | return videobuf_querybuf(&cam->vb_queue, buf); | |
1068 | } | |
1069 | ||
1070 | static int viacam_qbuf(struct file *filp, void *priv, struct v4l2_buffer *buf) | |
1071 | { | |
1072 | struct via_camera *cam = priv; | |
1073 | ||
1074 | return videobuf_qbuf(&cam->vb_queue, buf); | |
1075 | } | |
1076 | ||
1077 | static int viacam_dqbuf(struct file *filp, void *priv, struct v4l2_buffer *buf) | |
1078 | { | |
1079 | struct via_camera *cam = priv; | |
1080 | ||
1081 | return videobuf_dqbuf(&cam->vb_queue, buf, filp->f_flags & O_NONBLOCK); | |
1082 | } | |
1083 | ||
1084 | static int viacam_streamon(struct file *filp, void *priv, enum v4l2_buf_type t) | |
1085 | { | |
1086 | struct via_camera *cam = priv; | |
1087 | int ret = 0; | |
1088 | ||
1089 | if (t != V4L2_BUF_TYPE_VIDEO_CAPTURE) | |
1090 | return -EINVAL; | |
1091 | ||
1092 | mutex_lock(&cam->lock); | |
1093 | if (cam->opstate != S_IDLE) { | |
1094 | ret = -EBUSY; | |
1095 | goto out; | |
1096 | } | |
1097 | /* | |
1098 | * Enforce the V4l2 "only one owner gets to read data" rule. | |
1099 | */ | |
1100 | if (cam->owner && cam->owner != filp) { | |
1101 | ret = -EBUSY; | |
1102 | goto out; | |
1103 | } | |
1104 | cam->owner = filp; | |
1105 | /* | |
1106 | * Configure things if need be. | |
1107 | */ | |
1108 | if (test_bit(CF_CONFIG_NEEDED, &cam->flags)) { | |
1109 | ret = viacam_configure_sensor(cam); | |
1110 | if (ret) | |
1111 | goto out; | |
1112 | ret = viacam_config_controller(cam); | |
1113 | if (ret) | |
1114 | goto out; | |
1115 | } | |
1116 | /* | |
1117 | * If the CPU goes into C3, the DMA transfer gets corrupted and | |
1118 | * users start filing unsightly bug reports. Put in a "latency" | |
1119 | * requirement which will keep the CPU out of the deeper sleep | |
1120 | * states. | |
1121 | */ | |
1122 | pm_qos_add_request(&cam->qos_request, PM_QOS_CPU_DMA_LATENCY, 50); | |
1123 | /* | |
1124 | * Fire things up. | |
1125 | */ | |
1126 | INIT_LIST_HEAD(&cam->buffer_queue); | |
1127 | ret = videobuf_streamon(&cam->vb_queue); | |
1128 | if (!ret) | |
1129 | viacam_start_engine(cam); | |
1130 | out: | |
1131 | mutex_unlock(&cam->lock); | |
1132 | return ret; | |
1133 | } | |
1134 | ||
1135 | static int viacam_streamoff(struct file *filp, void *priv, enum v4l2_buf_type t) | |
1136 | { | |
1137 | struct via_camera *cam = priv; | |
1138 | int ret; | |
1139 | ||
1140 | if (t != V4L2_BUF_TYPE_VIDEO_CAPTURE) | |
1141 | return -EINVAL; | |
1142 | mutex_lock(&cam->lock); | |
1143 | if (cam->opstate != S_RUNNING) { | |
1144 | ret = -EINVAL; | |
1145 | goto out; | |
1146 | } | |
1147 | pm_qos_remove_request(&cam->qos_request); | |
1148 | viacam_stop_engine(cam); | |
1149 | /* | |
1150 | * Videobuf will recycle all of the outstanding buffers, but | |
1151 | * we should be sure we don't retain any references to | |
1152 | * any of them. | |
1153 | */ | |
1154 | ret = videobuf_streamoff(&cam->vb_queue); | |
1155 | INIT_LIST_HEAD(&cam->buffer_queue); | |
1156 | out: | |
1157 | mutex_unlock(&cam->lock); | |
1158 | return ret; | |
1159 | } | |
1160 | ||
024fafba JC |
1161 | /* G/S_PARM */ |
1162 | ||
1163 | static int viacam_g_parm(struct file *filp, void *priv, | |
1164 | struct v4l2_streamparm *parm) | |
1165 | { | |
1166 | struct via_camera *cam = priv; | |
1167 | int ret; | |
1168 | ||
1169 | mutex_lock(&cam->lock); | |
1170 | ret = sensor_call(cam, video, g_parm, parm); | |
1171 | mutex_unlock(&cam->lock); | |
1172 | parm->parm.capture.readbuffers = cam->n_cap_bufs; | |
1173 | return ret; | |
1174 | } | |
1175 | ||
1176 | static int viacam_s_parm(struct file *filp, void *priv, | |
1177 | struct v4l2_streamparm *parm) | |
1178 | { | |
1179 | struct via_camera *cam = priv; | |
1180 | int ret; | |
1181 | ||
1182 | mutex_lock(&cam->lock); | |
1183 | ret = sensor_call(cam, video, s_parm, parm); | |
1184 | mutex_unlock(&cam->lock); | |
1185 | parm->parm.capture.readbuffers = cam->n_cap_bufs; | |
1186 | return ret; | |
1187 | } | |
1188 | ||
1189 | static int viacam_enum_framesizes(struct file *filp, void *priv, | |
1190 | struct v4l2_frmsizeenum *sizes) | |
1191 | { | |
1192 | if (sizes->index != 0) | |
1193 | return -EINVAL; | |
1194 | sizes->type = V4L2_FRMSIZE_TYPE_CONTINUOUS; | |
1195 | sizes->stepwise.min_width = QCIF_WIDTH; | |
1196 | sizes->stepwise.min_height = QCIF_HEIGHT; | |
1197 | sizes->stepwise.max_width = VGA_WIDTH; | |
1198 | sizes->stepwise.max_height = VGA_HEIGHT; | |
1199 | sizes->stepwise.step_width = sizes->stepwise.step_height = 1; | |
1200 | return 0; | |
1201 | } | |
1202 | ||
1203 | static int viacam_enum_frameintervals(struct file *filp, void *priv, | |
1204 | struct v4l2_frmivalenum *interval) | |
1205 | { | |
1206 | struct via_camera *cam = priv; | |
1207 | int ret; | |
1208 | ||
1209 | mutex_lock(&cam->lock); | |
1210 | ret = sensor_call(cam, video, enum_frameintervals, interval); | |
1211 | mutex_unlock(&cam->lock); | |
1212 | return ret; | |
1213 | } | |
1214 | ||
1215 | ||
1216 | ||
1217 | static const struct v4l2_ioctl_ops viacam_ioctl_ops = { | |
1218 | .vidioc_g_chip_ident = viacam_g_chip_ident, | |
1219 | .vidioc_queryctrl = viacam_queryctrl, | |
1220 | .vidioc_g_ctrl = viacam_g_ctrl, | |
1221 | .vidioc_s_ctrl = viacam_s_ctrl, | |
1222 | .vidioc_enum_input = viacam_enum_input, | |
1223 | .vidioc_g_input = viacam_g_input, | |
1224 | .vidioc_s_input = viacam_s_input, | |
1225 | .vidioc_s_std = viacam_s_std, | |
1226 | .vidioc_enum_fmt_vid_cap = viacam_enum_fmt_vid_cap, | |
1227 | .vidioc_try_fmt_vid_cap = viacam_try_fmt_vid_cap, | |
1228 | .vidioc_g_fmt_vid_cap = viacam_g_fmt_vid_cap, | |
1229 | .vidioc_s_fmt_vid_cap = viacam_s_fmt_vid_cap, | |
1230 | .vidioc_querycap = viacam_querycap, | |
1231 | .vidioc_reqbufs = viacam_reqbufs, | |
1232 | .vidioc_querybuf = viacam_querybuf, | |
1233 | .vidioc_qbuf = viacam_qbuf, | |
1234 | .vidioc_dqbuf = viacam_dqbuf, | |
1235 | .vidioc_streamon = viacam_streamon, | |
1236 | .vidioc_streamoff = viacam_streamoff, | |
1237 | .vidioc_g_parm = viacam_g_parm, | |
1238 | .vidioc_s_parm = viacam_s_parm, | |
1239 | .vidioc_enum_framesizes = viacam_enum_framesizes, | |
1240 | .vidioc_enum_frameintervals = viacam_enum_frameintervals, | |
024fafba JC |
1241 | }; |
1242 | ||
1243 | /*----------------------------------------------------------------------------*/ | |
1244 | ||
1245 | /* | |
1246 | * Power management. | |
1247 | */ | |
0522921c DD |
1248 | #ifdef CONFIG_PM |
1249 | ||
1250 | static int viacam_suspend(void *priv) | |
1251 | { | |
1252 | struct via_camera *cam = priv; | |
1253 | enum viacam_opstate state = cam->opstate; | |
1254 | ||
1255 | if (cam->opstate != S_IDLE) { | |
1256 | viacam_stop_engine(cam); | |
1257 | cam->opstate = state; /* So resume restarts */ | |
1258 | } | |
1259 | ||
1260 | return 0; | |
1261 | } | |
1262 | ||
1263 | static int viacam_resume(void *priv) | |
1264 | { | |
1265 | struct via_camera *cam = priv; | |
1266 | int ret = 0; | |
1267 | ||
1268 | /* | |
1269 | * Get back to a reasonable operating state. | |
1270 | */ | |
1271 | via_write_reg_mask(VIASR, 0x78, 0, 0x80); | |
1272 | via_write_reg_mask(VIASR, 0x1e, 0xc0, 0xc0); | |
1273 | viacam_int_disable(cam); | |
1274 | set_bit(CF_CONFIG_NEEDED, &cam->flags); | |
1275 | /* | |
1276 | * Make sure the sensor's power state is correct | |
1277 | */ | |
1278 | if (cam->users > 0) | |
1279 | via_sensor_power_up(cam); | |
1280 | else | |
1281 | via_sensor_power_down(cam); | |
1282 | /* | |
1283 | * If it was operating, try to restart it. | |
1284 | */ | |
1285 | if (cam->opstate != S_IDLE) { | |
1286 | mutex_lock(&cam->lock); | |
1287 | ret = viacam_configure_sensor(cam); | |
1288 | if (!ret) | |
1289 | ret = viacam_config_controller(cam); | |
1290 | mutex_unlock(&cam->lock); | |
1291 | if (!ret) | |
1292 | viacam_start_engine(cam); | |
1293 | } | |
1294 | ||
1295 | return ret; | |
1296 | } | |
1297 | ||
1298 | static struct viafb_pm_hooks viacam_pm_hooks = { | |
1299 | .suspend = viacam_suspend, | |
1300 | .resume = viacam_resume | |
1301 | }; | |
1302 | ||
1303 | #endif /* CONFIG_PM */ | |
024fafba JC |
1304 | |
1305 | /* | |
1306 | * Setup stuff. | |
1307 | */ | |
1308 | ||
1309 | static struct video_device viacam_v4l_template = { | |
1310 | .name = "via-camera", | |
1311 | .minor = -1, | |
1312 | .tvnorms = V4L2_STD_NTSC_M, | |
1313 | .current_norm = V4L2_STD_NTSC_M, | |
1314 | .fops = &viacam_fops, | |
1315 | .ioctl_ops = &viacam_ioctl_ops, | |
1316 | .release = video_device_release_empty, /* Check this */ | |
1317 | }; | |
1318 | ||
c6384c88 DD |
1319 | /* |
1320 | * The OLPC folks put the serial port on the same pin as | |
1321 | * the camera. They also get grumpy if we break the | |
1322 | * serial port and keep them from using it. So we have | |
1323 | * to check the serial enable bit and not step on it. | |
1324 | */ | |
1325 | #define VIACAM_SERIAL_DEVFN 0x88 | |
1326 | #define VIACAM_SERIAL_CREG 0x46 | |
1327 | #define VIACAM_SERIAL_BIT 0x40 | |
1328 | ||
1329 | static __devinit bool viacam_serial_is_enabled(void) | |
1330 | { | |
1331 | struct pci_bus *pbus = pci_find_bus(0, 0); | |
1332 | u8 cbyte; | |
1333 | ||
1334 | pci_bus_read_config_byte(pbus, VIACAM_SERIAL_DEVFN, | |
1335 | VIACAM_SERIAL_CREG, &cbyte); | |
1336 | if ((cbyte & VIACAM_SERIAL_BIT) == 0) | |
1337 | return false; /* Not enabled */ | |
1338 | if (override_serial == 0) { | |
1339 | printk(KERN_NOTICE "Via camera: serial port is enabled, " \ | |
1340 | "refusing to load.\n"); | |
1341 | printk(KERN_NOTICE "Specify override_serial=1 to force " \ | |
1342 | "module loading.\n"); | |
1343 | return true; | |
1344 | } | |
1345 | printk(KERN_NOTICE "Via camera: overriding serial port\n"); | |
1346 | pci_bus_write_config_byte(pbus, VIACAM_SERIAL_DEVFN, | |
1347 | VIACAM_SERIAL_CREG, cbyte & ~VIACAM_SERIAL_BIT); | |
1348 | return false; | |
1349 | } | |
024fafba JC |
1350 | |
1351 | static __devinit int viacam_probe(struct platform_device *pdev) | |
1352 | { | |
1353 | int ret; | |
1354 | struct i2c_adapter *sensor_adapter; | |
1355 | struct viafb_dev *viadev = pdev->dev.platform_data; | |
1356 | ||
1357 | /* | |
1358 | * Note that there are actually two capture channels on | |
1359 | * the device. We only deal with one for now. That | |
1360 | * is encoded here; nothing else assumes it's dealing with | |
1361 | * a unique capture device. | |
1362 | */ | |
1363 | struct via_camera *cam; | |
1364 | ||
1365 | /* | |
1366 | * Ensure that frame buffer memory has been set aside for | |
1367 | * this purpose. As an arbitrary limit, refuse to work | |
1368 | * with less than two frames of VGA 16-bit data. | |
1369 | * | |
1370 | * If we ever support the second port, we'll need to set | |
1371 | * aside more memory. | |
1372 | */ | |
1373 | if (viadev->camera_fbmem_size < (VGA_HEIGHT*VGA_WIDTH*4)) { | |
1374 | printk(KERN_ERR "viacam: insufficient FB memory reserved\n"); | |
1375 | return -ENOMEM; | |
1376 | } | |
1377 | if (viadev->engine_mmio == NULL) { | |
1378 | printk(KERN_ERR "viacam: No I/O memory, so no pictures\n"); | |
1379 | return -ENOMEM; | |
1380 | } | |
c6384c88 DD |
1381 | |
1382 | if (machine_is_olpc() && viacam_serial_is_enabled()) | |
1383 | return -EBUSY; | |
1384 | ||
024fafba JC |
1385 | /* |
1386 | * Basic structure initialization. | |
1387 | */ | |
1388 | cam = kzalloc (sizeof(struct via_camera), GFP_KERNEL); | |
1389 | if (cam == NULL) | |
1390 | return -ENOMEM; | |
1391 | via_cam_info = cam; | |
1392 | cam->platdev = pdev; | |
1393 | cam->viadev = viadev; | |
1394 | cam->users = 0; | |
1395 | cam->owner = NULL; | |
1396 | cam->opstate = S_IDLE; | |
1397 | cam->user_format = cam->sensor_format = viacam_def_pix_format; | |
1398 | mutex_init(&cam->lock); | |
1399 | INIT_LIST_HEAD(&cam->buffer_queue); | |
1400 | cam->mmio = viadev->engine_mmio; | |
1401 | cam->fbmem = viadev->fbmem; | |
1402 | cam->fb_offset = viadev->camera_fbmem_offset; | |
1403 | cam->flags = 1 << CF_CONFIG_NEEDED; | |
1404 | cam->mbus_code = via_def_mbus_code; | |
1405 | /* | |
1406 | * Tell V4L that we exist. | |
1407 | */ | |
1408 | ret = v4l2_device_register(&pdev->dev, &cam->v4l2_dev); | |
1409 | if (ret) { | |
1410 | dev_err(&pdev->dev, "Unable to register v4l2 device\n"); | |
1411 | return ret; | |
1412 | } | |
1413 | /* | |
1414 | * Convince the system that we can do DMA. | |
1415 | */ | |
1416 | pdev->dev.dma_mask = &viadev->pdev->dma_mask; | |
1417 | dma_set_mask(&pdev->dev, 0xffffffff); | |
1418 | /* | |
1419 | * Fire up the capture port. The write to 0x78 looks purely | |
1420 | * OLPCish; any system will need to tweak 0x1e. | |
1421 | */ | |
1422 | via_write_reg_mask(VIASR, 0x78, 0, 0x80); | |
1423 | via_write_reg_mask(VIASR, 0x1e, 0xc0, 0xc0); | |
1424 | /* | |
1425 | * Get the sensor powered up. | |
1426 | */ | |
1427 | ret = via_sensor_power_setup(cam); | |
1428 | if (ret) | |
1429 | goto out_unregister; | |
1430 | via_sensor_power_up(cam); | |
1431 | ||
1432 | /* | |
1433 | * See if we can't find it on the bus. The VIA_PORT_31 assumption | |
1434 | * is OLPC-specific. 0x42 assumption is ov7670-specific. | |
1435 | */ | |
1436 | sensor_adapter = viafb_find_i2c_adapter(VIA_PORT_31); | |
1437 | cam->sensor = v4l2_i2c_new_subdev(&cam->v4l2_dev, sensor_adapter, | |
9a1f8b34 | 1438 | "ov7670", 0x42 >> 1, NULL); |
024fafba JC |
1439 | if (cam->sensor == NULL) { |
1440 | dev_err(&pdev->dev, "Unable to find the sensor!\n"); | |
1441 | ret = -ENODEV; | |
1442 | goto out_power_down; | |
1443 | } | |
1444 | /* | |
1445 | * Get the IRQ. | |
1446 | */ | |
1447 | viacam_int_disable(cam); | |
1448 | ret = request_threaded_irq(viadev->pdev->irq, viacam_quick_irq, | |
1449 | viacam_irq, IRQF_SHARED, "via-camera", cam); | |
1450 | if (ret) | |
1451 | goto out_power_down; | |
1452 | /* | |
1453 | * Tell V4l2 that we exist. | |
1454 | */ | |
1455 | cam->vdev = viacam_v4l_template; | |
1456 | cam->vdev.v4l2_dev = &cam->v4l2_dev; | |
1457 | ret = video_register_device(&cam->vdev, VFL_TYPE_GRABBER, -1); | |
1458 | if (ret) | |
1459 | goto out_irq; | |
1460 | video_set_drvdata(&cam->vdev, cam); | |
1461 | ||
0522921c DD |
1462 | #ifdef CONFIG_PM |
1463 | /* | |
1464 | * Hook into PM events | |
1465 | */ | |
1466 | viacam_pm_hooks.private = cam; | |
1467 | viafb_pm_register(&viacam_pm_hooks); | |
1468 | #endif | |
1469 | ||
024fafba JC |
1470 | /* Power the sensor down until somebody opens the device */ |
1471 | via_sensor_power_down(cam); | |
1472 | return 0; | |
1473 | ||
1474 | out_irq: | |
1475 | free_irq(viadev->pdev->irq, cam); | |
1476 | out_power_down: | |
1477 | via_sensor_power_release(cam); | |
1478 | out_unregister: | |
1479 | v4l2_device_unregister(&cam->v4l2_dev); | |
1480 | return ret; | |
1481 | } | |
1482 | ||
1483 | static __devexit int viacam_remove(struct platform_device *pdev) | |
1484 | { | |
1485 | struct via_camera *cam = via_cam_info; | |
1486 | struct viafb_dev *viadev = pdev->dev.platform_data; | |
1487 | ||
1488 | video_unregister_device(&cam->vdev); | |
1489 | v4l2_device_unregister(&cam->v4l2_dev); | |
1490 | free_irq(viadev->pdev->irq, cam); | |
1491 | via_sensor_power_release(cam); | |
1492 | via_cam_info = NULL; | |
1493 | return 0; | |
1494 | } | |
1495 | ||
024fafba JC |
1496 | static struct platform_driver viacam_driver = { |
1497 | .driver = { | |
1498 | .name = "viafb-camera", | |
1499 | }, | |
1500 | .probe = viacam_probe, | |
1501 | .remove = viacam_remove, | |
1502 | }; | |
1503 | ||
024fafba JC |
1504 | static int viacam_init(void) |
1505 | { | |
024fafba JC |
1506 | return platform_driver_register(&viacam_driver); |
1507 | } | |
1508 | module_init(viacam_init); | |
1509 | ||
1510 | static void viacam_exit(void) | |
1511 | { | |
1512 | platform_driver_unregister(&viacam_driver); | |
1513 | } | |
1514 | module_exit(viacam_exit); |