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> | |
dbf8f4e5 | 20 | #include <media/v4l2-ctrls.h> |
a39fbb1d | 21 | #include <media/ov7670.h> |
024fafba | 22 | #include <media/videobuf-dma-sg.h> |
024fafba JC |
23 | #include <linux/delay.h> |
24 | #include <linux/dma-mapping.h> | |
e8db0be1 | 25 | #include <linux/pm_qos.h> |
024fafba JC |
26 | #include <linux/via-core.h> |
27 | #include <linux/via-gpio.h> | |
28 | #include <linux/via_i2c.h> | |
c6384c88 | 29 | #include <asm/olpc.h> |
024fafba JC |
30 | |
31 | #include "via-camera.h" | |
32 | ||
027e99ab | 33 | MODULE_ALIAS("platform:viafb-camera"); |
024fafba JC |
34 | MODULE_AUTHOR("Jonathan Corbet <corbet@lwn.net>"); |
35 | MODULE_DESCRIPTION("VIA framebuffer-based camera controller driver"); | |
36 | MODULE_LICENSE("GPL"); | |
37 | ||
90ab5ee9 | 38 | static bool flip_image; |
024fafba JC |
39 | module_param(flip_image, bool, 0444); |
40 | MODULE_PARM_DESC(flip_image, | |
41 | "If set, the sensor will be instructed to flip the image " | |
42 | "vertically."); | |
43 | ||
90ab5ee9 | 44 | static bool override_serial; |
024fafba JC |
45 | module_param(override_serial, bool, 0444); |
46 | MODULE_PARM_DESC(override_serial, | |
47 | "The camera driver will normally refuse to load if " | |
48 | "the XO 1.5 serial port is enabled. Set this option " | |
c6384c88 | 49 | "to force-enable the camera."); |
024fafba JC |
50 | |
51 | /* | |
52 | * Basic window sizes. | |
53 | */ | |
54 | #define VGA_WIDTH 640 | |
55 | #define VGA_HEIGHT 480 | |
56 | #define QCIF_WIDTH 176 | |
57 | #define QCIF_HEIGHT 144 | |
58 | ||
59 | /* | |
60 | * The structure describing our camera. | |
61 | */ | |
62 | enum viacam_opstate { S_IDLE = 0, S_RUNNING = 1 }; | |
63 | ||
64 | struct via_camera { | |
65 | struct v4l2_device v4l2_dev; | |
dbf8f4e5 | 66 | struct v4l2_ctrl_handler ctrl_handler; |
024fafba JC |
67 | struct video_device vdev; |
68 | struct v4l2_subdev *sensor; | |
69 | struct platform_device *platdev; | |
70 | struct viafb_dev *viadev; | |
71 | struct mutex lock; | |
72 | enum viacam_opstate opstate; | |
73 | unsigned long flags; | |
cc749986 | 74 | struct pm_qos_request qos_request; |
024fafba JC |
75 | /* |
76 | * GPIO info for power/reset management | |
77 | */ | |
78 | int power_gpio; | |
79 | int reset_gpio; | |
80 | /* | |
81 | * I/O memory stuff. | |
82 | */ | |
83 | void __iomem *mmio; /* Where the registers live */ | |
84 | void __iomem *fbmem; /* Frame buffer memory */ | |
85 | u32 fb_offset; /* Reserved memory offset (FB) */ | |
86 | /* | |
87 | * Capture buffers and related. The controller supports | |
88 | * up to three, so that's what we have here. These buffers | |
89 | * live in frame buffer memory, so we don't call them "DMA". | |
90 | */ | |
91 | unsigned int cb_offsets[3]; /* offsets into fb mem */ | |
92 | u8 *cb_addrs[3]; /* Kernel-space addresses */ | |
93 | int n_cap_bufs; /* How many are we using? */ | |
94 | int next_buf; | |
95 | struct videobuf_queue vb_queue; | |
96 | struct list_head buffer_queue; /* prot. by reg_lock */ | |
97 | /* | |
98 | * User tracking. | |
99 | */ | |
100 | int users; | |
101 | struct file *owner; | |
102 | /* | |
103 | * Video format information. sensor_format is kept in a form | |
104 | * that we can use to pass to the sensor. We always run the | |
105 | * sensor in VGA resolution, though, and let the controller | |
106 | * downscale things if need be. So we keep the "real* | |
107 | * dimensions separately. | |
108 | */ | |
109 | struct v4l2_pix_format sensor_format; | |
110 | struct v4l2_pix_format user_format; | |
111 | enum v4l2_mbus_pixelcode mbus_code; | |
112 | }; | |
113 | ||
114 | /* | |
115 | * Yes, this is a hack, but there's only going to be one of these | |
116 | * on any system we know of. | |
117 | */ | |
118 | static struct via_camera *via_cam_info; | |
119 | ||
120 | /* | |
121 | * Flag values, manipulated with bitops | |
122 | */ | |
123 | #define CF_DMA_ACTIVE 0 /* A frame is incoming */ | |
124 | #define CF_CONFIG_NEEDED 1 /* Must configure hardware */ | |
125 | ||
126 | ||
127 | /* | |
128 | * Nasty ugly v4l2 boilerplate. | |
129 | */ | |
130 | #define sensor_call(cam, optype, func, args...) \ | |
131 | v4l2_subdev_call(cam->sensor, optype, func, ##args) | |
132 | ||
133 | /* | |
134 | * Debugging and related. | |
135 | */ | |
136 | #define cam_err(cam, fmt, arg...) \ | |
137 | dev_err(&(cam)->platdev->dev, fmt, ##arg); | |
138 | #define cam_warn(cam, fmt, arg...) \ | |
139 | dev_warn(&(cam)->platdev->dev, fmt, ##arg); | |
140 | #define cam_dbg(cam, fmt, arg...) \ | |
141 | dev_dbg(&(cam)->platdev->dev, fmt, ##arg); | |
142 | ||
143 | /* | |
144 | * Format handling. This is ripped almost directly from Hans's changes | |
145 | * to cafe_ccic.c. It's a little unfortunate; until this change, we | |
146 | * didn't need to know anything about the format except its byte depth; | |
147 | * now this information must be managed at this level too. | |
148 | */ | |
149 | static struct via_format { | |
150 | __u8 *desc; | |
151 | __u32 pixelformat; | |
152 | int bpp; /* Bytes per pixel */ | |
153 | enum v4l2_mbus_pixelcode mbus_code; | |
154 | } via_formats[] = { | |
155 | { | |
156 | .desc = "YUYV 4:2:2", | |
157 | .pixelformat = V4L2_PIX_FMT_YUYV, | |
158 | .mbus_code = V4L2_MBUS_FMT_YUYV8_2X8, | |
159 | .bpp = 2, | |
160 | }, | |
024fafba | 161 | /* RGB444 and Bayer should be doable, but have never been |
9c900f02 DD |
162 | tested with this driver. RGB565 seems to work at the default |
163 | resolution, but results in color corruption when being scaled by | |
164 | viacam_set_scaled(), and is disabled as a result. */ | |
024fafba JC |
165 | }; |
166 | #define N_VIA_FMTS ARRAY_SIZE(via_formats) | |
167 | ||
168 | static struct via_format *via_find_format(u32 pixelformat) | |
169 | { | |
170 | unsigned i; | |
171 | ||
172 | for (i = 0; i < N_VIA_FMTS; i++) | |
173 | if (via_formats[i].pixelformat == pixelformat) | |
174 | return via_formats + i; | |
175 | /* Not found? Then return the first format. */ | |
176 | return via_formats; | |
177 | } | |
178 | ||
179 | ||
180 | /*--------------------------------------------------------------------------*/ | |
181 | /* | |
182 | * Sensor power/reset management. This piece is OLPC-specific for | |
183 | * sure; other configurations will have things connected differently. | |
184 | */ | |
185 | static int via_sensor_power_setup(struct via_camera *cam) | |
186 | { | |
187 | int ret; | |
188 | ||
189 | cam->power_gpio = viafb_gpio_lookup("VGPIO3"); | |
190 | cam->reset_gpio = viafb_gpio_lookup("VGPIO2"); | |
191 | if (cam->power_gpio < 0 || cam->reset_gpio < 0) { | |
192 | dev_err(&cam->platdev->dev, "Unable to find GPIO lines\n"); | |
193 | return -EINVAL; | |
194 | } | |
195 | ret = gpio_request(cam->power_gpio, "viafb-camera"); | |
196 | if (ret) { | |
197 | dev_err(&cam->platdev->dev, "Unable to request power GPIO\n"); | |
198 | return ret; | |
199 | } | |
200 | ret = gpio_request(cam->reset_gpio, "viafb-camera"); | |
201 | if (ret) { | |
202 | dev_err(&cam->platdev->dev, "Unable to request reset GPIO\n"); | |
203 | gpio_free(cam->power_gpio); | |
204 | return ret; | |
205 | } | |
206 | gpio_direction_output(cam->power_gpio, 0); | |
207 | gpio_direction_output(cam->reset_gpio, 0); | |
208 | return 0; | |
209 | } | |
210 | ||
211 | /* | |
212 | * Power up the sensor and perform the reset dance. | |
213 | */ | |
214 | static void via_sensor_power_up(struct via_camera *cam) | |
215 | { | |
216 | gpio_set_value(cam->power_gpio, 1); | |
217 | gpio_set_value(cam->reset_gpio, 0); | |
218 | msleep(20); /* Probably excessive */ | |
219 | gpio_set_value(cam->reset_gpio, 1); | |
220 | msleep(20); | |
221 | } | |
222 | ||
223 | static void via_sensor_power_down(struct via_camera *cam) | |
224 | { | |
225 | gpio_set_value(cam->power_gpio, 0); | |
226 | gpio_set_value(cam->reset_gpio, 0); | |
227 | } | |
228 | ||
229 | ||
230 | static void via_sensor_power_release(struct via_camera *cam) | |
231 | { | |
232 | via_sensor_power_down(cam); | |
233 | gpio_free(cam->power_gpio); | |
234 | gpio_free(cam->reset_gpio); | |
235 | } | |
236 | ||
237 | /* --------------------------------------------------------------------------*/ | |
238 | /* Sensor ops */ | |
239 | ||
240 | /* | |
241 | * Manage the ov7670 "flip" bit, which needs special help. | |
242 | */ | |
243 | static int viacam_set_flip(struct via_camera *cam) | |
244 | { | |
245 | struct v4l2_control ctrl; | |
246 | ||
247 | memset(&ctrl, 0, sizeof(ctrl)); | |
248 | ctrl.id = V4L2_CID_VFLIP; | |
249 | ctrl.value = flip_image; | |
250 | return sensor_call(cam, core, s_ctrl, &ctrl); | |
251 | } | |
252 | ||
253 | /* | |
254 | * Configure the sensor. It's up to the caller to ensure | |
255 | * that the camera is in the correct operating state. | |
256 | */ | |
257 | static int viacam_configure_sensor(struct via_camera *cam) | |
258 | { | |
259 | struct v4l2_mbus_framefmt mbus_fmt; | |
260 | int ret; | |
261 | ||
262 | v4l2_fill_mbus_format(&mbus_fmt, &cam->sensor_format, cam->mbus_code); | |
263 | ret = sensor_call(cam, core, init, 0); | |
264 | if (ret == 0) | |
265 | ret = sensor_call(cam, video, s_mbus_fmt, &mbus_fmt); | |
266 | /* | |
267 | * OV7670 does weird things if flip is set *before* format... | |
268 | */ | |
269 | if (ret == 0) | |
270 | ret = viacam_set_flip(cam); | |
271 | return ret; | |
272 | } | |
273 | ||
274 | ||
275 | ||
276 | /* --------------------------------------------------------------------------*/ | |
277 | /* | |
278 | * Some simple register accessors; they assume that the lock is held. | |
279 | * | |
280 | * Should we want to support the second capture engine, we could | |
281 | * hide the register difference by adding 0x1000 to registers in the | |
282 | * 0x300-350 range. | |
283 | */ | |
284 | static inline void viacam_write_reg(struct via_camera *cam, | |
285 | int reg, int value) | |
286 | { | |
287 | iowrite32(value, cam->mmio + reg); | |
288 | } | |
289 | ||
290 | static inline int viacam_read_reg(struct via_camera *cam, int reg) | |
291 | { | |
292 | return ioread32(cam->mmio + reg); | |
293 | } | |
294 | ||
295 | static inline void viacam_write_reg_mask(struct via_camera *cam, | |
296 | int reg, int value, int mask) | |
297 | { | |
298 | int tmp = viacam_read_reg(cam, reg); | |
299 | ||
300 | tmp = (tmp & ~mask) | (value & mask); | |
301 | viacam_write_reg(cam, reg, tmp); | |
302 | } | |
303 | ||
304 | ||
305 | /* --------------------------------------------------------------------------*/ | |
306 | /* Interrupt management and handling */ | |
307 | ||
308 | static irqreturn_t viacam_quick_irq(int irq, void *data) | |
309 | { | |
310 | struct via_camera *cam = data; | |
311 | irqreturn_t ret = IRQ_NONE; | |
312 | int icv; | |
313 | ||
314 | /* | |
315 | * All we do here is to clear the interrupts and tell | |
316 | * the handler thread to wake up. | |
317 | */ | |
318 | spin_lock(&cam->viadev->reg_lock); | |
319 | icv = viacam_read_reg(cam, VCR_INTCTRL); | |
320 | if (icv & VCR_IC_EAV) { | |
321 | icv |= VCR_IC_EAV|VCR_IC_EVBI|VCR_IC_FFULL; | |
322 | viacam_write_reg(cam, VCR_INTCTRL, icv); | |
323 | ret = IRQ_WAKE_THREAD; | |
324 | } | |
325 | spin_unlock(&cam->viadev->reg_lock); | |
326 | return ret; | |
327 | } | |
328 | ||
329 | /* | |
330 | * Find the next videobuf buffer which has somebody waiting on it. | |
331 | */ | |
332 | static struct videobuf_buffer *viacam_next_buffer(struct via_camera *cam) | |
333 | { | |
334 | unsigned long flags; | |
335 | struct videobuf_buffer *buf = NULL; | |
336 | ||
337 | spin_lock_irqsave(&cam->viadev->reg_lock, flags); | |
338 | if (cam->opstate != S_RUNNING) | |
339 | goto out; | |
340 | if (list_empty(&cam->buffer_queue)) | |
341 | goto out; | |
342 | buf = list_entry(cam->buffer_queue.next, struct videobuf_buffer, queue); | |
343 | if (!waitqueue_active(&buf->done)) {/* Nobody waiting */ | |
344 | buf = NULL; | |
345 | goto out; | |
346 | } | |
347 | list_del(&buf->queue); | |
348 | buf->state = VIDEOBUF_ACTIVE; | |
349 | out: | |
350 | spin_unlock_irqrestore(&cam->viadev->reg_lock, flags); | |
351 | return buf; | |
352 | } | |
353 | ||
354 | /* | |
355 | * The threaded IRQ handler. | |
356 | */ | |
357 | static irqreturn_t viacam_irq(int irq, void *data) | |
358 | { | |
359 | int bufn; | |
360 | struct videobuf_buffer *vb; | |
361 | struct via_camera *cam = data; | |
362 | struct videobuf_dmabuf *vdma; | |
363 | ||
364 | /* | |
365 | * If there is no place to put the data frame, don't bother | |
366 | * with anything else. | |
367 | */ | |
368 | vb = viacam_next_buffer(cam); | |
369 | if (vb == NULL) | |
370 | goto done; | |
371 | /* | |
372 | * Figure out which buffer we just completed. | |
373 | */ | |
374 | bufn = (viacam_read_reg(cam, VCR_INTCTRL) & VCR_IC_ACTBUF) >> 3; | |
375 | bufn -= 1; | |
376 | if (bufn < 0) | |
377 | bufn = cam->n_cap_bufs - 1; | |
378 | /* | |
379 | * Copy over the data and let any waiters know. | |
380 | */ | |
381 | vdma = videobuf_to_dma(vb); | |
382 | viafb_dma_copy_out_sg(cam->cb_offsets[bufn], vdma->sglist, vdma->sglen); | |
383 | vb->state = VIDEOBUF_DONE; | |
384 | vb->size = cam->user_format.sizeimage; | |
385 | wake_up(&vb->done); | |
386 | done: | |
387 | return IRQ_HANDLED; | |
388 | } | |
389 | ||
390 | ||
391 | /* | |
392 | * These functions must mess around with the general interrupt | |
393 | * control register, which is relevant to much more than just the | |
394 | * camera. Nothing else uses interrupts, though, as of this writing. | |
395 | * Should that situation change, we'll have to improve support at | |
396 | * the via-core level. | |
397 | */ | |
398 | static void viacam_int_enable(struct via_camera *cam) | |
399 | { | |
400 | viacam_write_reg(cam, VCR_INTCTRL, | |
401 | VCR_IC_INTEN|VCR_IC_EAV|VCR_IC_EVBI|VCR_IC_FFULL); | |
402 | viafb_irq_enable(VDE_I_C0AVEN); | |
403 | } | |
404 | ||
405 | static void viacam_int_disable(struct via_camera *cam) | |
406 | { | |
407 | viafb_irq_disable(VDE_I_C0AVEN); | |
408 | viacam_write_reg(cam, VCR_INTCTRL, 0); | |
409 | } | |
410 | ||
411 | ||
412 | ||
413 | /* --------------------------------------------------------------------------*/ | |
414 | /* Controller operations */ | |
415 | ||
416 | /* | |
417 | * Set up our capture buffers in framebuffer memory. | |
418 | */ | |
419 | static int viacam_ctlr_cbufs(struct via_camera *cam) | |
420 | { | |
421 | int nbuf = cam->viadev->camera_fbmem_size/cam->sensor_format.sizeimage; | |
422 | int i; | |
423 | unsigned int offset; | |
424 | ||
425 | /* | |
426 | * See how many buffers we can work with. | |
427 | */ | |
428 | if (nbuf >= 3) { | |
429 | cam->n_cap_bufs = 3; | |
430 | viacam_write_reg_mask(cam, VCR_CAPINTC, VCR_CI_3BUFS, | |
431 | VCR_CI_3BUFS); | |
432 | } else if (nbuf == 2) { | |
433 | cam->n_cap_bufs = 2; | |
434 | viacam_write_reg_mask(cam, VCR_CAPINTC, 0, VCR_CI_3BUFS); | |
435 | } else { | |
436 | cam_warn(cam, "Insufficient frame buffer memory\n"); | |
437 | return -ENOMEM; | |
438 | } | |
439 | /* | |
440 | * Set them up. | |
441 | */ | |
442 | offset = cam->fb_offset; | |
443 | for (i = 0; i < cam->n_cap_bufs; i++) { | |
444 | cam->cb_offsets[i] = offset; | |
445 | cam->cb_addrs[i] = cam->fbmem + offset; | |
446 | viacam_write_reg(cam, VCR_VBUF1 + i*4, offset & VCR_VBUF_MASK); | |
447 | offset += cam->sensor_format.sizeimage; | |
448 | } | |
449 | return 0; | |
450 | } | |
451 | ||
452 | /* | |
453 | * Set the scaling register for downscaling the image. | |
454 | * | |
455 | * This register works like this... Vertical scaling is enabled | |
456 | * by bit 26; if that bit is set, downscaling is controlled by the | |
457 | * value in bits 16:25. Those bits are divided by 1024 to get | |
458 | * the scaling factor; setting just bit 25 thus cuts the height | |
459 | * in half. | |
460 | * | |
461 | * Horizontal scaling works about the same, but it's enabled by | |
462 | * bit 11, with bits 0:10 giving the numerator of a fraction | |
463 | * (over 2048) for the scaling value. | |
464 | * | |
465 | * This function is naive in that, if the user departs from | |
466 | * the 3x4 VGA scaling factor, the image will distort. We | |
467 | * could work around that if it really seemed important. | |
468 | */ | |
469 | static void viacam_set_scale(struct via_camera *cam) | |
470 | { | |
471 | unsigned int avscale; | |
472 | int sf; | |
473 | ||
474 | if (cam->user_format.width == VGA_WIDTH) | |
475 | avscale = 0; | |
476 | else { | |
477 | sf = (cam->user_format.width*2048)/VGA_WIDTH; | |
478 | avscale = VCR_AVS_HEN | sf; | |
479 | } | |
480 | if (cam->user_format.height < VGA_HEIGHT) { | |
481 | sf = (1024*cam->user_format.height)/VGA_HEIGHT; | |
482 | avscale |= VCR_AVS_VEN | (sf << 16); | |
483 | } | |
484 | viacam_write_reg(cam, VCR_AVSCALE, avscale); | |
485 | } | |
486 | ||
487 | ||
488 | /* | |
489 | * Configure image-related information into the capture engine. | |
490 | */ | |
491 | static void viacam_ctlr_image(struct via_camera *cam) | |
492 | { | |
493 | int cicreg; | |
494 | ||
495 | /* | |
496 | * Disable clock before messing with stuff - from the via | |
497 | * sample driver. | |
498 | */ | |
499 | viacam_write_reg(cam, VCR_CAPINTC, ~(VCR_CI_ENABLE|VCR_CI_CLKEN)); | |
500 | /* | |
501 | * Set up the controller for VGA resolution, modulo magic | |
502 | * offsets from the via sample driver. | |
503 | */ | |
504 | viacam_write_reg(cam, VCR_HORRANGE, 0x06200120); | |
505 | viacam_write_reg(cam, VCR_VERTRANGE, 0x01de0000); | |
506 | viacam_set_scale(cam); | |
507 | /* | |
508 | * Image size info. | |
509 | */ | |
510 | viacam_write_reg(cam, VCR_MAXDATA, | |
511 | (cam->sensor_format.height << 16) | | |
512 | (cam->sensor_format.bytesperline >> 3)); | |
513 | viacam_write_reg(cam, VCR_MAXVBI, 0); | |
514 | viacam_write_reg(cam, VCR_VSTRIDE, | |
515 | cam->user_format.bytesperline & VCR_VS_STRIDE); | |
516 | /* | |
517 | * Set up the capture interface control register, | |
518 | * everything but the "go" bit. | |
519 | * | |
520 | * The FIFO threshold is a bit of a magic number; 8 is what | |
521 | * VIA's sample code uses. | |
522 | */ | |
523 | cicreg = VCR_CI_CLKEN | | |
524 | 0x08000000 | /* FIFO threshold */ | |
525 | VCR_CI_FLDINV | /* OLPC-specific? */ | |
526 | VCR_CI_VREFINV | /* OLPC-specific? */ | |
527 | VCR_CI_DIBOTH | /* Capture both fields */ | |
528 | VCR_CI_CCIR601_8; | |
529 | if (cam->n_cap_bufs == 3) | |
530 | cicreg |= VCR_CI_3BUFS; | |
531 | /* | |
532 | * YUV formats need different byte swapping than RGB. | |
533 | */ | |
534 | if (cam->user_format.pixelformat == V4L2_PIX_FMT_YUYV) | |
535 | cicreg |= VCR_CI_YUYV; | |
536 | else | |
537 | cicreg |= VCR_CI_UYVY; | |
538 | viacam_write_reg(cam, VCR_CAPINTC, cicreg); | |
539 | } | |
540 | ||
541 | ||
542 | static int viacam_config_controller(struct via_camera *cam) | |
543 | { | |
544 | int ret; | |
545 | unsigned long flags; | |
546 | ||
547 | spin_lock_irqsave(&cam->viadev->reg_lock, flags); | |
548 | ret = viacam_ctlr_cbufs(cam); | |
549 | if (!ret) | |
550 | viacam_ctlr_image(cam); | |
551 | spin_unlock_irqrestore(&cam->viadev->reg_lock, flags); | |
552 | clear_bit(CF_CONFIG_NEEDED, &cam->flags); | |
553 | return ret; | |
554 | } | |
555 | ||
556 | /* | |
557 | * Make it start grabbing data. | |
558 | */ | |
559 | static void viacam_start_engine(struct via_camera *cam) | |
560 | { | |
561 | spin_lock_irq(&cam->viadev->reg_lock); | |
562 | cam->next_buf = 0; | |
563 | viacam_write_reg_mask(cam, VCR_CAPINTC, VCR_CI_ENABLE, VCR_CI_ENABLE); | |
564 | viacam_int_enable(cam); | |
565 | (void) viacam_read_reg(cam, VCR_CAPINTC); /* Force post */ | |
566 | cam->opstate = S_RUNNING; | |
567 | spin_unlock_irq(&cam->viadev->reg_lock); | |
568 | } | |
569 | ||
570 | ||
571 | static void viacam_stop_engine(struct via_camera *cam) | |
572 | { | |
573 | spin_lock_irq(&cam->viadev->reg_lock); | |
574 | viacam_int_disable(cam); | |
575 | viacam_write_reg_mask(cam, VCR_CAPINTC, 0, VCR_CI_ENABLE); | |
576 | (void) viacam_read_reg(cam, VCR_CAPINTC); /* Force post */ | |
577 | cam->opstate = S_IDLE; | |
578 | spin_unlock_irq(&cam->viadev->reg_lock); | |
579 | } | |
580 | ||
581 | ||
582 | /* --------------------------------------------------------------------------*/ | |
583 | /* Videobuf callback ops */ | |
584 | ||
585 | /* | |
586 | * buffer_setup. The purpose of this one would appear to be to tell | |
587 | * videobuf how big a single image is. It's also evidently up to us | |
588 | * to put some sort of limit on the maximum number of buffers allowed. | |
589 | */ | |
590 | static int viacam_vb_buf_setup(struct videobuf_queue *q, | |
591 | unsigned int *count, unsigned int *size) | |
592 | { | |
593 | struct via_camera *cam = q->priv_data; | |
594 | ||
595 | *size = cam->user_format.sizeimage; | |
596 | if (*count == 0 || *count > 6) /* Arbitrary number */ | |
597 | *count = 6; | |
598 | return 0; | |
599 | } | |
600 | ||
601 | /* | |
602 | * Prepare a buffer. | |
603 | */ | |
604 | static int viacam_vb_buf_prepare(struct videobuf_queue *q, | |
605 | struct videobuf_buffer *vb, enum v4l2_field field) | |
606 | { | |
607 | struct via_camera *cam = q->priv_data; | |
608 | ||
609 | vb->size = cam->user_format.sizeimage; | |
610 | vb->width = cam->user_format.width; /* bytesperline???? */ | |
611 | vb->height = cam->user_format.height; | |
612 | vb->field = field; | |
613 | if (vb->state == VIDEOBUF_NEEDS_INIT) { | |
614 | int ret = videobuf_iolock(q, vb, NULL); | |
615 | if (ret) | |
616 | return ret; | |
617 | } | |
618 | vb->state = VIDEOBUF_PREPARED; | |
619 | return 0; | |
620 | } | |
621 | ||
622 | /* | |
623 | * We've got a buffer to put data into. | |
624 | * | |
625 | * FIXME: check for a running engine and valid buffers? | |
626 | */ | |
627 | static void viacam_vb_buf_queue(struct videobuf_queue *q, | |
628 | struct videobuf_buffer *vb) | |
629 | { | |
630 | struct via_camera *cam = q->priv_data; | |
631 | ||
632 | /* | |
633 | * Note that videobuf holds the lock when it calls | |
634 | * us, so we need not (indeed, cannot) take it here. | |
635 | */ | |
636 | vb->state = VIDEOBUF_QUEUED; | |
637 | list_add_tail(&vb->queue, &cam->buffer_queue); | |
638 | } | |
639 | ||
640 | /* | |
641 | * Free a buffer. | |
642 | */ | |
643 | static void viacam_vb_buf_release(struct videobuf_queue *q, | |
644 | struct videobuf_buffer *vb) | |
645 | { | |
646 | struct via_camera *cam = q->priv_data; | |
647 | ||
648 | videobuf_dma_unmap(&cam->platdev->dev, videobuf_to_dma(vb)); | |
649 | videobuf_dma_free(videobuf_to_dma(vb)); | |
650 | vb->state = VIDEOBUF_NEEDS_INIT; | |
651 | } | |
652 | ||
653 | static const struct videobuf_queue_ops viacam_vb_ops = { | |
654 | .buf_setup = viacam_vb_buf_setup, | |
655 | .buf_prepare = viacam_vb_buf_prepare, | |
656 | .buf_queue = viacam_vb_buf_queue, | |
657 | .buf_release = viacam_vb_buf_release, | |
658 | }; | |
659 | ||
660 | /* --------------------------------------------------------------------------*/ | |
661 | /* File operations */ | |
662 | ||
663 | static int viacam_open(struct file *filp) | |
664 | { | |
665 | struct via_camera *cam = video_drvdata(filp); | |
666 | ||
667 | filp->private_data = cam; | |
668 | /* | |
669 | * Note the new user. If this is the first one, we'll also | |
670 | * need to power up the sensor. | |
671 | */ | |
672 | mutex_lock(&cam->lock); | |
673 | if (cam->users == 0) { | |
674 | int ret = viafb_request_dma(); | |
675 | ||
676 | if (ret) { | |
677 | mutex_unlock(&cam->lock); | |
678 | return ret; | |
679 | } | |
680 | via_sensor_power_up(cam); | |
681 | set_bit(CF_CONFIG_NEEDED, &cam->flags); | |
682 | /* | |
683 | * Hook into videobuf. Evidently this cannot fail. | |
684 | */ | |
685 | videobuf_queue_sg_init(&cam->vb_queue, &viacam_vb_ops, | |
686 | &cam->platdev->dev, &cam->viadev->reg_lock, | |
687 | V4L2_BUF_TYPE_VIDEO_CAPTURE, V4L2_FIELD_NONE, | |
688 | sizeof(struct videobuf_buffer), cam, NULL); | |
689 | } | |
690 | (cam->users)++; | |
691 | mutex_unlock(&cam->lock); | |
692 | return 0; | |
693 | } | |
694 | ||
695 | static int viacam_release(struct file *filp) | |
696 | { | |
697 | struct via_camera *cam = video_drvdata(filp); | |
698 | ||
699 | mutex_lock(&cam->lock); | |
700 | (cam->users)--; | |
701 | /* | |
702 | * If the "owner" is closing, shut down any ongoing | |
703 | * operations. | |
704 | */ | |
705 | if (filp == cam->owner) { | |
706 | videobuf_stop(&cam->vb_queue); | |
707 | /* | |
708 | * We don't hold the spinlock here, but, if release() | |
709 | * is being called by the owner, nobody else will | |
710 | * be changing the state. And an extra stop would | |
711 | * not hurt anyway. | |
712 | */ | |
713 | if (cam->opstate != S_IDLE) | |
714 | viacam_stop_engine(cam); | |
715 | cam->owner = NULL; | |
716 | } | |
717 | /* | |
718 | * Last one out needs to turn out the lights. | |
719 | */ | |
720 | if (cam->users == 0) { | |
721 | videobuf_mmap_free(&cam->vb_queue); | |
722 | via_sensor_power_down(cam); | |
723 | viafb_release_dma(); | |
724 | } | |
725 | mutex_unlock(&cam->lock); | |
726 | return 0; | |
727 | } | |
728 | ||
729 | /* | |
730 | * Read a frame from the device. | |
731 | */ | |
732 | static ssize_t viacam_read(struct file *filp, char __user *buffer, | |
733 | size_t len, loff_t *pos) | |
734 | { | |
735 | struct via_camera *cam = video_drvdata(filp); | |
736 | int ret; | |
737 | ||
738 | mutex_lock(&cam->lock); | |
739 | /* | |
740 | * Enforce the V4l2 "only one owner gets to read data" rule. | |
741 | */ | |
742 | if (cam->owner && cam->owner != filp) { | |
743 | ret = -EBUSY; | |
744 | goto out_unlock; | |
745 | } | |
746 | cam->owner = filp; | |
747 | /* | |
748 | * Do we need to configure the hardware? | |
749 | */ | |
750 | if (test_bit(CF_CONFIG_NEEDED, &cam->flags)) { | |
751 | ret = viacam_configure_sensor(cam); | |
752 | if (!ret) | |
753 | ret = viacam_config_controller(cam); | |
754 | if (ret) | |
755 | goto out_unlock; | |
756 | } | |
757 | /* | |
758 | * Fire up the capture engine, then have videobuf do | |
759 | * the heavy lifting. Someday it would be good to avoid | |
760 | * stopping and restarting the engine each time. | |
761 | */ | |
762 | INIT_LIST_HEAD(&cam->buffer_queue); | |
763 | viacam_start_engine(cam); | |
764 | ret = videobuf_read_stream(&cam->vb_queue, buffer, len, pos, 0, | |
765 | filp->f_flags & O_NONBLOCK); | |
766 | viacam_stop_engine(cam); | |
767 | /* videobuf_stop() ?? */ | |
768 | ||
769 | out_unlock: | |
770 | mutex_unlock(&cam->lock); | |
771 | return ret; | |
772 | } | |
773 | ||
774 | ||
775 | static unsigned int viacam_poll(struct file *filp, struct poll_table_struct *pt) | |
776 | { | |
777 | struct via_camera *cam = video_drvdata(filp); | |
778 | ||
779 | return videobuf_poll_stream(filp, &cam->vb_queue, pt); | |
780 | } | |
781 | ||
782 | ||
783 | static int viacam_mmap(struct file *filp, struct vm_area_struct *vma) | |
784 | { | |
785 | struct via_camera *cam = video_drvdata(filp); | |
786 | ||
787 | return videobuf_mmap_mapper(&cam->vb_queue, vma); | |
788 | } | |
789 | ||
790 | ||
791 | ||
792 | static const struct v4l2_file_operations viacam_fops = { | |
793 | .owner = THIS_MODULE, | |
794 | .open = viacam_open, | |
795 | .release = viacam_release, | |
796 | .read = viacam_read, | |
797 | .poll = viacam_poll, | |
798 | .mmap = viacam_mmap, | |
799 | .unlocked_ioctl = video_ioctl2, | |
800 | }; | |
801 | ||
802 | /*----------------------------------------------------------------------------*/ | |
803 | /* | |
804 | * The long list of v4l2 ioctl ops | |
805 | */ | |
806 | ||
024fafba JC |
807 | /* |
808 | * Only one input. | |
809 | */ | |
810 | static int viacam_enum_input(struct file *filp, void *priv, | |
811 | struct v4l2_input *input) | |
812 | { | |
813 | if (input->index != 0) | |
814 | return -EINVAL; | |
815 | ||
816 | input->type = V4L2_INPUT_TYPE_CAMERA; | |
817 | input->std = V4L2_STD_ALL; /* Not sure what should go here */ | |
818 | strcpy(input->name, "Camera"); | |
819 | return 0; | |
820 | } | |
821 | ||
822 | static int viacam_g_input(struct file *filp, void *priv, unsigned int *i) | |
823 | { | |
824 | *i = 0; | |
825 | return 0; | |
826 | } | |
827 | ||
828 | static int viacam_s_input(struct file *filp, void *priv, unsigned int i) | |
829 | { | |
830 | if (i != 0) | |
831 | return -EINVAL; | |
832 | return 0; | |
833 | } | |
834 | ||
314527ac | 835 | static int viacam_s_std(struct file *filp, void *priv, v4l2_std_id std) |
024fafba JC |
836 | { |
837 | return 0; | |
838 | } | |
839 | ||
d31e545b HV |
840 | static int viacam_g_std(struct file *filp, void *priv, v4l2_std_id *std) |
841 | { | |
842 | *std = V4L2_STD_NTSC_M; | |
843 | return 0; | |
844 | } | |
845 | ||
024fafba JC |
846 | /* |
847 | * Video format stuff. Here is our default format until | |
848 | * user space messes with things. | |
849 | */ | |
850 | static const struct v4l2_pix_format viacam_def_pix_format = { | |
851 | .width = VGA_WIDTH, | |
852 | .height = VGA_HEIGHT, | |
853 | .pixelformat = V4L2_PIX_FMT_YUYV, | |
854 | .field = V4L2_FIELD_NONE, | |
855 | .bytesperline = VGA_WIDTH * 2, | |
856 | .sizeimage = VGA_WIDTH * VGA_HEIGHT * 2, | |
857 | }; | |
858 | ||
859 | static const enum v4l2_mbus_pixelcode via_def_mbus_code = V4L2_MBUS_FMT_YUYV8_2X8; | |
860 | ||
861 | static int viacam_enum_fmt_vid_cap(struct file *filp, void *priv, | |
862 | struct v4l2_fmtdesc *fmt) | |
863 | { | |
864 | if (fmt->index >= N_VIA_FMTS) | |
865 | return -EINVAL; | |
866 | strlcpy(fmt->description, via_formats[fmt->index].desc, | |
867 | sizeof(fmt->description)); | |
868 | fmt->pixelformat = via_formats[fmt->index].pixelformat; | |
869 | return 0; | |
870 | } | |
871 | ||
872 | /* | |
873 | * Figure out proper image dimensions, but always force the | |
874 | * sensor to VGA. | |
875 | */ | |
876 | static void viacam_fmt_pre(struct v4l2_pix_format *userfmt, | |
877 | struct v4l2_pix_format *sensorfmt) | |
878 | { | |
879 | *sensorfmt = *userfmt; | |
880 | if (userfmt->width < QCIF_WIDTH || userfmt->height < QCIF_HEIGHT) { | |
881 | userfmt->width = QCIF_WIDTH; | |
882 | userfmt->height = QCIF_HEIGHT; | |
883 | } | |
884 | if (userfmt->width > VGA_WIDTH || userfmt->height > VGA_HEIGHT) { | |
885 | userfmt->width = VGA_WIDTH; | |
886 | userfmt->height = VGA_HEIGHT; | |
887 | } | |
888 | sensorfmt->width = VGA_WIDTH; | |
889 | sensorfmt->height = VGA_HEIGHT; | |
890 | } | |
891 | ||
892 | static void viacam_fmt_post(struct v4l2_pix_format *userfmt, | |
893 | struct v4l2_pix_format *sensorfmt) | |
894 | { | |
895 | struct via_format *f = via_find_format(userfmt->pixelformat); | |
896 | ||
897 | sensorfmt->bytesperline = sensorfmt->width * f->bpp; | |
898 | sensorfmt->sizeimage = sensorfmt->height * sensorfmt->bytesperline; | |
899 | userfmt->pixelformat = sensorfmt->pixelformat; | |
900 | userfmt->field = sensorfmt->field; | |
901 | userfmt->bytesperline = 2 * userfmt->width; | |
902 | userfmt->sizeimage = userfmt->bytesperline * userfmt->height; | |
903 | } | |
904 | ||
905 | ||
906 | /* | |
907 | * The real work of figuring out a workable format. | |
908 | */ | |
909 | static int viacam_do_try_fmt(struct via_camera *cam, | |
910 | struct v4l2_pix_format *upix, struct v4l2_pix_format *spix) | |
911 | { | |
912 | int ret; | |
913 | struct v4l2_mbus_framefmt mbus_fmt; | |
914 | struct via_format *f = via_find_format(upix->pixelformat); | |
915 | ||
916 | upix->pixelformat = f->pixelformat; | |
917 | viacam_fmt_pre(upix, spix); | |
7980a4d5 | 918 | v4l2_fill_mbus_format(&mbus_fmt, spix, f->mbus_code); |
024fafba JC |
919 | ret = sensor_call(cam, video, try_mbus_fmt, &mbus_fmt); |
920 | v4l2_fill_pix_format(spix, &mbus_fmt); | |
921 | viacam_fmt_post(upix, spix); | |
922 | return ret; | |
923 | } | |
924 | ||
925 | ||
926 | ||
927 | static 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 | ||
941 | static 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 | ||
952 | static 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); | |
985 | out: | |
986 | mutex_unlock(&cam->lock); | |
987 | return ret; | |
988 | } | |
989 | ||
990 | static int viacam_querycap(struct file *filp, void *priv, | |
991 | struct v4l2_capability *cap) | |
992 | { | |
993 | strcpy(cap->driver, "via-camera"); | |
994 | strcpy(cap->card, "via-camera"); | |
995 | cap->version = 1; | |
996 | cap->capabilities = V4L2_CAP_VIDEO_CAPTURE | | |
997 | V4L2_CAP_READWRITE | V4L2_CAP_STREAMING; | |
998 | return 0; | |
999 | } | |
1000 | ||
1001 | /* | |
1002 | * Streaming operations - pure videobuf stuff. | |
1003 | */ | |
1004 | static 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 | ||
1012 | static 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 | ||
1020 | static 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 | ||
1027 | static 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 | ||
1034 | static 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); | |
1080 | out: | |
1081 | mutex_unlock(&cam->lock); | |
1082 | return ret; | |
1083 | } | |
1084 | ||
1085 | static 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); | |
1106 | out: | |
1107 | mutex_unlock(&cam->lock); | |
1108 | return ret; | |
1109 | } | |
1110 | ||
024fafba JC |
1111 | /* G/S_PARM */ |
1112 | ||
1113 | static 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 = sensor_call(cam, video, g_parm, parm); | |
1121 | mutex_unlock(&cam->lock); | |
1122 | parm->parm.capture.readbuffers = cam->n_cap_bufs; | |
1123 | return ret; | |
1124 | } | |
1125 | ||
1126 | static 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 = sensor_call(cam, video, s_parm, parm); | |
1134 | mutex_unlock(&cam->lock); | |
1135 | parm->parm.capture.readbuffers = cam->n_cap_bufs; | |
1136 | return ret; | |
1137 | } | |
1138 | ||
1139 | static 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 | ||
1153 | static int viacam_enum_frameintervals(struct file *filp, void *priv, | |
1154 | struct v4l2_frmivalenum *interval) | |
1155 | { | |
1156 | struct via_camera *cam = priv; | |
1157 | int ret; | |
1158 | ||
1159 | mutex_lock(&cam->lock); | |
1160 | ret = sensor_call(cam, video, enum_frameintervals, interval); | |
1161 | mutex_unlock(&cam->lock); | |
1162 | return ret; | |
1163 | } | |
1164 | ||
1165 | ||
1166 | ||
1167 | static const struct v4l2_ioctl_ops viacam_ioctl_ops = { | |
024fafba JC |
1168 | .vidioc_enum_input = viacam_enum_input, |
1169 | .vidioc_g_input = viacam_g_input, | |
1170 | .vidioc_s_input = viacam_s_input, | |
1171 | .vidioc_s_std = viacam_s_std, | |
d31e545b | 1172 | .vidioc_g_std = viacam_g_std, |
024fafba JC |
1173 | .vidioc_enum_fmt_vid_cap = viacam_enum_fmt_vid_cap, |
1174 | .vidioc_try_fmt_vid_cap = viacam_try_fmt_vid_cap, | |
1175 | .vidioc_g_fmt_vid_cap = viacam_g_fmt_vid_cap, | |
1176 | .vidioc_s_fmt_vid_cap = viacam_s_fmt_vid_cap, | |
1177 | .vidioc_querycap = viacam_querycap, | |
1178 | .vidioc_reqbufs = viacam_reqbufs, | |
1179 | .vidioc_querybuf = viacam_querybuf, | |
1180 | .vidioc_qbuf = viacam_qbuf, | |
1181 | .vidioc_dqbuf = viacam_dqbuf, | |
1182 | .vidioc_streamon = viacam_streamon, | |
1183 | .vidioc_streamoff = viacam_streamoff, | |
1184 | .vidioc_g_parm = viacam_g_parm, | |
1185 | .vidioc_s_parm = viacam_s_parm, | |
1186 | .vidioc_enum_framesizes = viacam_enum_framesizes, | |
1187 | .vidioc_enum_frameintervals = viacam_enum_frameintervals, | |
024fafba JC |
1188 | }; |
1189 | ||
1190 | /*----------------------------------------------------------------------------*/ | |
1191 | ||
1192 | /* | |
1193 | * Power management. | |
1194 | */ | |
0522921c DD |
1195 | #ifdef CONFIG_PM |
1196 | ||
1197 | static int viacam_suspend(void *priv) | |
1198 | { | |
1199 | struct via_camera *cam = priv; | |
1200 | enum viacam_opstate state = cam->opstate; | |
1201 | ||
1202 | if (cam->opstate != S_IDLE) { | |
1203 | viacam_stop_engine(cam); | |
1204 | cam->opstate = state; /* So resume restarts */ | |
1205 | } | |
1206 | ||
1207 | return 0; | |
1208 | } | |
1209 | ||
1210 | static int viacam_resume(void *priv) | |
1211 | { | |
1212 | struct via_camera *cam = priv; | |
1213 | int ret = 0; | |
1214 | ||
1215 | /* | |
1216 | * Get back to a reasonable operating state. | |
1217 | */ | |
1218 | via_write_reg_mask(VIASR, 0x78, 0, 0x80); | |
1219 | via_write_reg_mask(VIASR, 0x1e, 0xc0, 0xc0); | |
1220 | viacam_int_disable(cam); | |
1221 | set_bit(CF_CONFIG_NEEDED, &cam->flags); | |
1222 | /* | |
1223 | * Make sure the sensor's power state is correct | |
1224 | */ | |
1225 | if (cam->users > 0) | |
1226 | via_sensor_power_up(cam); | |
1227 | else | |
1228 | via_sensor_power_down(cam); | |
1229 | /* | |
1230 | * If it was operating, try to restart it. | |
1231 | */ | |
1232 | if (cam->opstate != S_IDLE) { | |
1233 | mutex_lock(&cam->lock); | |
1234 | ret = viacam_configure_sensor(cam); | |
1235 | if (!ret) | |
1236 | ret = viacam_config_controller(cam); | |
1237 | mutex_unlock(&cam->lock); | |
1238 | if (!ret) | |
1239 | viacam_start_engine(cam); | |
1240 | } | |
1241 | ||
1242 | return ret; | |
1243 | } | |
1244 | ||
1245 | static struct viafb_pm_hooks viacam_pm_hooks = { | |
1246 | .suspend = viacam_suspend, | |
1247 | .resume = viacam_resume | |
1248 | }; | |
1249 | ||
1250 | #endif /* CONFIG_PM */ | |
024fafba JC |
1251 | |
1252 | /* | |
1253 | * Setup stuff. | |
1254 | */ | |
1255 | ||
1256 | static struct video_device viacam_v4l_template = { | |
1257 | .name = "via-camera", | |
1258 | .minor = -1, | |
1259 | .tvnorms = V4L2_STD_NTSC_M, | |
024fafba JC |
1260 | .fops = &viacam_fops, |
1261 | .ioctl_ops = &viacam_ioctl_ops, | |
1262 | .release = video_device_release_empty, /* Check this */ | |
1263 | }; | |
1264 | ||
c6384c88 DD |
1265 | /* |
1266 | * The OLPC folks put the serial port on the same pin as | |
1267 | * the camera. They also get grumpy if we break the | |
1268 | * serial port and keep them from using it. So we have | |
1269 | * to check the serial enable bit and not step on it. | |
1270 | */ | |
1271 | #define VIACAM_SERIAL_DEVFN 0x88 | |
1272 | #define VIACAM_SERIAL_CREG 0x46 | |
1273 | #define VIACAM_SERIAL_BIT 0x40 | |
1274 | ||
4c62e976 | 1275 | static bool viacam_serial_is_enabled(void) |
c6384c88 DD |
1276 | { |
1277 | struct pci_bus *pbus = pci_find_bus(0, 0); | |
1278 | u8 cbyte; | |
1279 | ||
c8814df3 JJ |
1280 | if (!pbus) |
1281 | return false; | |
c6384c88 DD |
1282 | pci_bus_read_config_byte(pbus, VIACAM_SERIAL_DEVFN, |
1283 | VIACAM_SERIAL_CREG, &cbyte); | |
1284 | if ((cbyte & VIACAM_SERIAL_BIT) == 0) | |
1285 | return false; /* Not enabled */ | |
1286 | if (override_serial == 0) { | |
1287 | printk(KERN_NOTICE "Via camera: serial port is enabled, " \ | |
1288 | "refusing to load.\n"); | |
1289 | printk(KERN_NOTICE "Specify override_serial=1 to force " \ | |
1290 | "module loading.\n"); | |
1291 | return true; | |
1292 | } | |
1293 | printk(KERN_NOTICE "Via camera: overriding serial port\n"); | |
1294 | pci_bus_write_config_byte(pbus, VIACAM_SERIAL_DEVFN, | |
1295 | VIACAM_SERIAL_CREG, cbyte & ~VIACAM_SERIAL_BIT); | |
1296 | return false; | |
1297 | } | |
024fafba | 1298 | |
a39fbb1d DD |
1299 | static struct ov7670_config sensor_cfg = { |
1300 | /* The XO-1.5 (only known user) clocks the camera at 90MHz. */ | |
1301 | .clock_speed = 90, | |
1302 | }; | |
1303 | ||
4c62e976 | 1304 | static int viacam_probe(struct platform_device *pdev) |
024fafba JC |
1305 | { |
1306 | int ret; | |
1307 | struct i2c_adapter *sensor_adapter; | |
1308 | struct viafb_dev *viadev = pdev->dev.platform_data; | |
a39fbb1d DD |
1309 | struct i2c_board_info ov7670_info = { |
1310 | .type = "ov7670", | |
1311 | .addr = 0x42 >> 1, | |
1312 | .platform_data = &sensor_cfg, | |
1313 | }; | |
024fafba JC |
1314 | |
1315 | /* | |
1316 | * Note that there are actually two capture channels on | |
1317 | * the device. We only deal with one for now. That | |
1318 | * is encoded here; nothing else assumes it's dealing with | |
1319 | * a unique capture device. | |
1320 | */ | |
1321 | struct via_camera *cam; | |
1322 | ||
1323 | /* | |
1324 | * Ensure that frame buffer memory has been set aside for | |
1325 | * this purpose. As an arbitrary limit, refuse to work | |
1326 | * with less than two frames of VGA 16-bit data. | |
1327 | * | |
1328 | * If we ever support the second port, we'll need to set | |
1329 | * aside more memory. | |
1330 | */ | |
1331 | if (viadev->camera_fbmem_size < (VGA_HEIGHT*VGA_WIDTH*4)) { | |
1332 | printk(KERN_ERR "viacam: insufficient FB memory reserved\n"); | |
1333 | return -ENOMEM; | |
1334 | } | |
1335 | if (viadev->engine_mmio == NULL) { | |
1336 | printk(KERN_ERR "viacam: No I/O memory, so no pictures\n"); | |
1337 | return -ENOMEM; | |
1338 | } | |
c6384c88 DD |
1339 | |
1340 | if (machine_is_olpc() && viacam_serial_is_enabled()) | |
1341 | return -EBUSY; | |
1342 | ||
024fafba JC |
1343 | /* |
1344 | * Basic structure initialization. | |
1345 | */ | |
1346 | cam = kzalloc (sizeof(struct via_camera), GFP_KERNEL); | |
1347 | if (cam == NULL) | |
1348 | return -ENOMEM; | |
1349 | via_cam_info = cam; | |
1350 | cam->platdev = pdev; | |
1351 | cam->viadev = viadev; | |
1352 | cam->users = 0; | |
1353 | cam->owner = NULL; | |
1354 | cam->opstate = S_IDLE; | |
1355 | cam->user_format = cam->sensor_format = viacam_def_pix_format; | |
1356 | mutex_init(&cam->lock); | |
1357 | INIT_LIST_HEAD(&cam->buffer_queue); | |
1358 | cam->mmio = viadev->engine_mmio; | |
1359 | cam->fbmem = viadev->fbmem; | |
1360 | cam->fb_offset = viadev->camera_fbmem_offset; | |
1361 | cam->flags = 1 << CF_CONFIG_NEEDED; | |
1362 | cam->mbus_code = via_def_mbus_code; | |
1363 | /* | |
1364 | * Tell V4L that we exist. | |
1365 | */ | |
1366 | ret = v4l2_device_register(&pdev->dev, &cam->v4l2_dev); | |
1367 | if (ret) { | |
1368 | dev_err(&pdev->dev, "Unable to register v4l2 device\n"); | |
dbf8f4e5 | 1369 | goto out_free; |
024fafba | 1370 | } |
dbf8f4e5 JM |
1371 | ret = v4l2_ctrl_handler_init(&cam->ctrl_handler, 10); |
1372 | if (ret) | |
1373 | goto out_unregister; | |
1374 | cam->v4l2_dev.ctrl_handler = &cam->ctrl_handler; | |
024fafba JC |
1375 | /* |
1376 | * Convince the system that we can do DMA. | |
1377 | */ | |
1378 | pdev->dev.dma_mask = &viadev->pdev->dma_mask; | |
1379 | dma_set_mask(&pdev->dev, 0xffffffff); | |
1380 | /* | |
1381 | * Fire up the capture port. The write to 0x78 looks purely | |
1382 | * OLPCish; any system will need to tweak 0x1e. | |
1383 | */ | |
1384 | via_write_reg_mask(VIASR, 0x78, 0, 0x80); | |
1385 | via_write_reg_mask(VIASR, 0x1e, 0xc0, 0xc0); | |
1386 | /* | |
1387 | * Get the sensor powered up. | |
1388 | */ | |
1389 | ret = via_sensor_power_setup(cam); | |
1390 | if (ret) | |
dbf8f4e5 | 1391 | goto out_ctrl_hdl_free; |
024fafba JC |
1392 | via_sensor_power_up(cam); |
1393 | ||
1394 | /* | |
1395 | * See if we can't find it on the bus. The VIA_PORT_31 assumption | |
1396 | * is OLPC-specific. 0x42 assumption is ov7670-specific. | |
1397 | */ | |
1398 | sensor_adapter = viafb_find_i2c_adapter(VIA_PORT_31); | |
a39fbb1d DD |
1399 | cam->sensor = v4l2_i2c_new_subdev_board(&cam->v4l2_dev, sensor_adapter, |
1400 | &ov7670_info, NULL); | |
024fafba JC |
1401 | if (cam->sensor == NULL) { |
1402 | dev_err(&pdev->dev, "Unable to find the sensor!\n"); | |
1403 | ret = -ENODEV; | |
1404 | goto out_power_down; | |
1405 | } | |
1406 | /* | |
1407 | * Get the IRQ. | |
1408 | */ | |
1409 | viacam_int_disable(cam); | |
1410 | ret = request_threaded_irq(viadev->pdev->irq, viacam_quick_irq, | |
1411 | viacam_irq, IRQF_SHARED, "via-camera", cam); | |
1412 | if (ret) | |
1413 | goto out_power_down; | |
1414 | /* | |
1415 | * Tell V4l2 that we exist. | |
1416 | */ | |
1417 | cam->vdev = viacam_v4l_template; | |
1418 | cam->vdev.v4l2_dev = &cam->v4l2_dev; | |
1419 | ret = video_register_device(&cam->vdev, VFL_TYPE_GRABBER, -1); | |
1420 | if (ret) | |
1421 | goto out_irq; | |
1422 | video_set_drvdata(&cam->vdev, cam); | |
1423 | ||
0522921c DD |
1424 | #ifdef CONFIG_PM |
1425 | /* | |
1426 | * Hook into PM events | |
1427 | */ | |
1428 | viacam_pm_hooks.private = cam; | |
1429 | viafb_pm_register(&viacam_pm_hooks); | |
1430 | #endif | |
1431 | ||
024fafba JC |
1432 | /* Power the sensor down until somebody opens the device */ |
1433 | via_sensor_power_down(cam); | |
1434 | return 0; | |
1435 | ||
1436 | out_irq: | |
1437 | free_irq(viadev->pdev->irq, cam); | |
1438 | out_power_down: | |
1439 | via_sensor_power_release(cam); | |
dbf8f4e5 JM |
1440 | out_ctrl_hdl_free: |
1441 | v4l2_ctrl_handler_free(&cam->ctrl_handler); | |
024fafba JC |
1442 | out_unregister: |
1443 | v4l2_device_unregister(&cam->v4l2_dev); | |
dbf8f4e5 JM |
1444 | out_free: |
1445 | kfree(cam); | |
024fafba JC |
1446 | return ret; |
1447 | } | |
1448 | ||
4c62e976 | 1449 | static int viacam_remove(struct platform_device *pdev) |
024fafba JC |
1450 | { |
1451 | struct via_camera *cam = via_cam_info; | |
1452 | struct viafb_dev *viadev = pdev->dev.platform_data; | |
1453 | ||
1454 | video_unregister_device(&cam->vdev); | |
1455 | v4l2_device_unregister(&cam->v4l2_dev); | |
1456 | free_irq(viadev->pdev->irq, cam); | |
1457 | via_sensor_power_release(cam); | |
dbf8f4e5 JM |
1458 | v4l2_ctrl_handler_free(&cam->ctrl_handler); |
1459 | kfree(cam); | |
024fafba JC |
1460 | via_cam_info = NULL; |
1461 | return 0; | |
1462 | } | |
1463 | ||
024fafba JC |
1464 | static struct platform_driver viacam_driver = { |
1465 | .driver = { | |
1466 | .name = "viafb-camera", | |
1467 | }, | |
1468 | .probe = viacam_probe, | |
1469 | .remove = viacam_remove, | |
1470 | }; | |
1471 | ||
1d6629b1 | 1472 | module_platform_driver(viacam_driver); |