Commit | Line | Data |
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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> | |
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; | |
66 | struct video_device vdev; | |
67 | struct v4l2_subdev *sensor; | |
68 | struct platform_device *platdev; | |
69 | struct viafb_dev *viadev; | |
70 | struct mutex lock; | |
71 | enum viacam_opstate opstate; | |
72 | unsigned long flags; | |
cc749986 | 73 | struct pm_qos_request qos_request; |
024fafba JC |
74 | /* |
75 | * GPIO info for power/reset management | |
76 | */ | |
77 | int power_gpio; | |
78 | int reset_gpio; | |
79 | /* | |
80 | * I/O memory stuff. | |
81 | */ | |
82 | void __iomem *mmio; /* Where the registers live */ | |
83 | void __iomem *fbmem; /* Frame buffer memory */ | |
84 | u32 fb_offset; /* Reserved memory offset (FB) */ | |
85 | /* | |
86 | * Capture buffers and related. The controller supports | |
87 | * up to three, so that's what we have here. These buffers | |
88 | * live in frame buffer memory, so we don't call them "DMA". | |
89 | */ | |
90 | unsigned int cb_offsets[3]; /* offsets into fb mem */ | |
91 | u8 *cb_addrs[3]; /* Kernel-space addresses */ | |
92 | int n_cap_bufs; /* How many are we using? */ | |
93 | int next_buf; | |
94 | struct videobuf_queue vb_queue; | |
95 | struct list_head buffer_queue; /* prot. by reg_lock */ | |
96 | /* | |
97 | * User tracking. | |
98 | */ | |
99 | int users; | |
100 | struct file *owner; | |
101 | /* | |
102 | * Video format information. sensor_format is kept in a form | |
103 | * that we can use to pass to the sensor. We always run the | |
104 | * sensor in VGA resolution, though, and let the controller | |
105 | * downscale things if need be. So we keep the "real* | |
106 | * dimensions separately. | |
107 | */ | |
108 | struct v4l2_pix_format sensor_format; | |
109 | struct v4l2_pix_format user_format; | |
110 | enum v4l2_mbus_pixelcode mbus_code; | |
111 | }; | |
112 | ||
113 | /* | |
114 | * Yes, this is a hack, but there's only going to be one of these | |
115 | * on any system we know of. | |
116 | */ | |
117 | static struct via_camera *via_cam_info; | |
118 | ||
119 | /* | |
120 | * Flag values, manipulated with bitops | |
121 | */ | |
122 | #define CF_DMA_ACTIVE 0 /* A frame is incoming */ | |
123 | #define CF_CONFIG_NEEDED 1 /* Must configure hardware */ | |
124 | ||
125 | ||
126 | /* | |
127 | * Nasty ugly v4l2 boilerplate. | |
128 | */ | |
129 | #define sensor_call(cam, optype, func, args...) \ | |
130 | v4l2_subdev_call(cam->sensor, optype, func, ##args) | |
131 | ||
132 | /* | |
133 | * Debugging and related. | |
134 | */ | |
135 | #define cam_err(cam, fmt, arg...) \ | |
136 | dev_err(&(cam)->platdev->dev, fmt, ##arg); | |
137 | #define cam_warn(cam, fmt, arg...) \ | |
138 | dev_warn(&(cam)->platdev->dev, fmt, ##arg); | |
139 | #define cam_dbg(cam, fmt, arg...) \ | |
140 | dev_dbg(&(cam)->platdev->dev, fmt, ##arg); | |
141 | ||
142 | /* | |
143 | * Format handling. This is ripped almost directly from Hans's changes | |
144 | * to cafe_ccic.c. It's a little unfortunate; until this change, we | |
145 | * didn't need to know anything about the format except its byte depth; | |
146 | * now this information must be managed at this level too. | |
147 | */ | |
148 | static struct via_format { | |
149 | __u8 *desc; | |
150 | __u32 pixelformat; | |
151 | int bpp; /* Bytes per pixel */ | |
152 | enum v4l2_mbus_pixelcode mbus_code; | |
153 | } via_formats[] = { | |
154 | { | |
155 | .desc = "YUYV 4:2:2", | |
156 | .pixelformat = V4L2_PIX_FMT_YUYV, | |
157 | .mbus_code = V4L2_MBUS_FMT_YUYV8_2X8, | |
158 | .bpp = 2, | |
159 | }, | |
024fafba | 160 | /* RGB444 and Bayer should be doable, but have never been |
9c900f02 DD |
161 | tested with this driver. RGB565 seems to work at the default |
162 | resolution, but results in color corruption when being scaled by | |
163 | viacam_set_scaled(), and is disabled as a result. */ | |
024fafba JC |
164 | }; |
165 | #define N_VIA_FMTS ARRAY_SIZE(via_formats) | |
166 | ||
167 | static struct via_format *via_find_format(u32 pixelformat) | |
168 | { | |
169 | unsigned i; | |
170 | ||
171 | for (i = 0; i < N_VIA_FMTS; i++) | |
172 | if (via_formats[i].pixelformat == pixelformat) | |
173 | return via_formats + i; | |
174 | /* Not found? Then return the first format. */ | |
175 | return via_formats; | |
176 | } | |
177 | ||
178 | ||
179 | /*--------------------------------------------------------------------------*/ | |
180 | /* | |
181 | * Sensor power/reset management. This piece is OLPC-specific for | |
182 | * sure; other configurations will have things connected differently. | |
183 | */ | |
184 | static int via_sensor_power_setup(struct via_camera *cam) | |
185 | { | |
186 | int ret; | |
187 | ||
188 | cam->power_gpio = viafb_gpio_lookup("VGPIO3"); | |
189 | cam->reset_gpio = viafb_gpio_lookup("VGPIO2"); | |
190 | if (cam->power_gpio < 0 || cam->reset_gpio < 0) { | |
191 | dev_err(&cam->platdev->dev, "Unable to find GPIO lines\n"); | |
192 | return -EINVAL; | |
193 | } | |
194 | ret = gpio_request(cam->power_gpio, "viafb-camera"); | |
195 | if (ret) { | |
196 | dev_err(&cam->platdev->dev, "Unable to request power GPIO\n"); | |
197 | return ret; | |
198 | } | |
199 | ret = gpio_request(cam->reset_gpio, "viafb-camera"); | |
200 | if (ret) { | |
201 | dev_err(&cam->platdev->dev, "Unable to request reset GPIO\n"); | |
202 | gpio_free(cam->power_gpio); | |
203 | return ret; | |
204 | } | |
205 | gpio_direction_output(cam->power_gpio, 0); | |
206 | gpio_direction_output(cam->reset_gpio, 0); | |
207 | return 0; | |
208 | } | |
209 | ||
210 | /* | |
211 | * Power up the sensor and perform the reset dance. | |
212 | */ | |
213 | static void via_sensor_power_up(struct via_camera *cam) | |
214 | { | |
215 | gpio_set_value(cam->power_gpio, 1); | |
216 | gpio_set_value(cam->reset_gpio, 0); | |
217 | msleep(20); /* Probably excessive */ | |
218 | gpio_set_value(cam->reset_gpio, 1); | |
219 | msleep(20); | |
220 | } | |
221 | ||
222 | static void via_sensor_power_down(struct via_camera *cam) | |
223 | { | |
224 | gpio_set_value(cam->power_gpio, 0); | |
225 | gpio_set_value(cam->reset_gpio, 0); | |
226 | } | |
227 | ||
228 | ||
229 | static void via_sensor_power_release(struct via_camera *cam) | |
230 | { | |
231 | via_sensor_power_down(cam); | |
232 | gpio_free(cam->power_gpio); | |
233 | gpio_free(cam->reset_gpio); | |
234 | } | |
235 | ||
236 | /* --------------------------------------------------------------------------*/ | |
237 | /* Sensor ops */ | |
238 | ||
239 | /* | |
240 | * Manage the ov7670 "flip" bit, which needs special help. | |
241 | */ | |
242 | static int viacam_set_flip(struct via_camera *cam) | |
243 | { | |
244 | struct v4l2_control ctrl; | |
245 | ||
246 | memset(&ctrl, 0, sizeof(ctrl)); | |
247 | ctrl.id = V4L2_CID_VFLIP; | |
248 | ctrl.value = flip_image; | |
249 | return sensor_call(cam, core, s_ctrl, &ctrl); | |
250 | } | |
251 | ||
252 | /* | |
253 | * Configure the sensor. It's up to the caller to ensure | |
254 | * that the camera is in the correct operating state. | |
255 | */ | |
256 | static int viacam_configure_sensor(struct via_camera *cam) | |
257 | { | |
258 | struct v4l2_mbus_framefmt mbus_fmt; | |
259 | int ret; | |
260 | ||
261 | v4l2_fill_mbus_format(&mbus_fmt, &cam->sensor_format, cam->mbus_code); | |
262 | ret = sensor_call(cam, core, init, 0); | |
263 | if (ret == 0) | |
264 | ret = sensor_call(cam, video, s_mbus_fmt, &mbus_fmt); | |
265 | /* | |
266 | * OV7670 does weird things if flip is set *before* format... | |
267 | */ | |
268 | if (ret == 0) | |
269 | ret = viacam_set_flip(cam); | |
270 | return ret; | |
271 | } | |
272 | ||
273 | ||
274 | ||
275 | /* --------------------------------------------------------------------------*/ | |
276 | /* | |
277 | * Some simple register accessors; they assume that the lock is held. | |
278 | * | |
279 | * Should we want to support the second capture engine, we could | |
280 | * hide the register difference by adding 0x1000 to registers in the | |
281 | * 0x300-350 range. | |
282 | */ | |
283 | static inline void viacam_write_reg(struct via_camera *cam, | |
284 | int reg, int value) | |
285 | { | |
286 | iowrite32(value, cam->mmio + reg); | |
287 | } | |
288 | ||
289 | static inline int viacam_read_reg(struct via_camera *cam, int reg) | |
290 | { | |
291 | return ioread32(cam->mmio + reg); | |
292 | } | |
293 | ||
294 | static inline void viacam_write_reg_mask(struct via_camera *cam, | |
295 | int reg, int value, int mask) | |
296 | { | |
297 | int tmp = viacam_read_reg(cam, reg); | |
298 | ||
299 | tmp = (tmp & ~mask) | (value & mask); | |
300 | viacam_write_reg(cam, reg, tmp); | |
301 | } | |
302 | ||
303 | ||
304 | /* --------------------------------------------------------------------------*/ | |
305 | /* Interrupt management and handling */ | |
306 | ||
307 | static irqreturn_t viacam_quick_irq(int irq, void *data) | |
308 | { | |
309 | struct via_camera *cam = data; | |
310 | irqreturn_t ret = IRQ_NONE; | |
311 | int icv; | |
312 | ||
313 | /* | |
314 | * All we do here is to clear the interrupts and tell | |
315 | * the handler thread to wake up. | |
316 | */ | |
317 | spin_lock(&cam->viadev->reg_lock); | |
318 | icv = viacam_read_reg(cam, VCR_INTCTRL); | |
319 | if (icv & VCR_IC_EAV) { | |
320 | icv |= VCR_IC_EAV|VCR_IC_EVBI|VCR_IC_FFULL; | |
321 | viacam_write_reg(cam, VCR_INTCTRL, icv); | |
322 | ret = IRQ_WAKE_THREAD; | |
323 | } | |
324 | spin_unlock(&cam->viadev->reg_lock); | |
325 | return ret; | |
326 | } | |
327 | ||
328 | /* | |
329 | * Find the next videobuf buffer which has somebody waiting on it. | |
330 | */ | |
331 | static struct videobuf_buffer *viacam_next_buffer(struct via_camera *cam) | |
332 | { | |
333 | unsigned long flags; | |
334 | struct videobuf_buffer *buf = NULL; | |
335 | ||
336 | spin_lock_irqsave(&cam->viadev->reg_lock, flags); | |
337 | if (cam->opstate != S_RUNNING) | |
338 | goto out; | |
339 | if (list_empty(&cam->buffer_queue)) | |
340 | goto out; | |
341 | buf = list_entry(cam->buffer_queue.next, struct videobuf_buffer, queue); | |
342 | if (!waitqueue_active(&buf->done)) {/* Nobody waiting */ | |
343 | buf = NULL; | |
344 | goto out; | |
345 | } | |
346 | list_del(&buf->queue); | |
347 | buf->state = VIDEOBUF_ACTIVE; | |
348 | out: | |
349 | spin_unlock_irqrestore(&cam->viadev->reg_lock, flags); | |
350 | return buf; | |
351 | } | |
352 | ||
353 | /* | |
354 | * The threaded IRQ handler. | |
355 | */ | |
356 | static irqreturn_t viacam_irq(int irq, void *data) | |
357 | { | |
358 | int bufn; | |
359 | struct videobuf_buffer *vb; | |
360 | struct via_camera *cam = data; | |
361 | struct videobuf_dmabuf *vdma; | |
362 | ||
363 | /* | |
364 | * If there is no place to put the data frame, don't bother | |
365 | * with anything else. | |
366 | */ | |
367 | vb = viacam_next_buffer(cam); | |
368 | if (vb == NULL) | |
369 | goto done; | |
370 | /* | |
371 | * Figure out which buffer we just completed. | |
372 | */ | |
373 | bufn = (viacam_read_reg(cam, VCR_INTCTRL) & VCR_IC_ACTBUF) >> 3; | |
374 | bufn -= 1; | |
375 | if (bufn < 0) | |
376 | bufn = cam->n_cap_bufs - 1; | |
377 | /* | |
378 | * Copy over the data and let any waiters know. | |
379 | */ | |
380 | vdma = videobuf_to_dma(vb); | |
381 | viafb_dma_copy_out_sg(cam->cb_offsets[bufn], vdma->sglist, vdma->sglen); | |
382 | vb->state = VIDEOBUF_DONE; | |
383 | vb->size = cam->user_format.sizeimage; | |
384 | wake_up(&vb->done); | |
385 | done: | |
386 | return IRQ_HANDLED; | |
387 | } | |
388 | ||
389 | ||
390 | /* | |
391 | * These functions must mess around with the general interrupt | |
392 | * control register, which is relevant to much more than just the | |
393 | * camera. Nothing else uses interrupts, though, as of this writing. | |
394 | * Should that situation change, we'll have to improve support at | |
395 | * the via-core level. | |
396 | */ | |
397 | static void viacam_int_enable(struct via_camera *cam) | |
398 | { | |
399 | viacam_write_reg(cam, VCR_INTCTRL, | |
400 | VCR_IC_INTEN|VCR_IC_EAV|VCR_IC_EVBI|VCR_IC_FFULL); | |
401 | viafb_irq_enable(VDE_I_C0AVEN); | |
402 | } | |
403 | ||
404 | static void viacam_int_disable(struct via_camera *cam) | |
405 | { | |
406 | viafb_irq_disable(VDE_I_C0AVEN); | |
407 | viacam_write_reg(cam, VCR_INTCTRL, 0); | |
408 | } | |
409 | ||
410 | ||
411 | ||
412 | /* --------------------------------------------------------------------------*/ | |
413 | /* Controller operations */ | |
414 | ||
415 | /* | |
416 | * Set up our capture buffers in framebuffer memory. | |
417 | */ | |
418 | static int viacam_ctlr_cbufs(struct via_camera *cam) | |
419 | { | |
420 | int nbuf = cam->viadev->camera_fbmem_size/cam->sensor_format.sizeimage; | |
421 | int i; | |
422 | unsigned int offset; | |
423 | ||
424 | /* | |
425 | * See how many buffers we can work with. | |
426 | */ | |
427 | if (nbuf >= 3) { | |
428 | cam->n_cap_bufs = 3; | |
429 | viacam_write_reg_mask(cam, VCR_CAPINTC, VCR_CI_3BUFS, | |
430 | VCR_CI_3BUFS); | |
431 | } else if (nbuf == 2) { | |
432 | cam->n_cap_bufs = 2; | |
433 | viacam_write_reg_mask(cam, VCR_CAPINTC, 0, VCR_CI_3BUFS); | |
434 | } else { | |
435 | cam_warn(cam, "Insufficient frame buffer memory\n"); | |
436 | return -ENOMEM; | |
437 | } | |
438 | /* | |
439 | * Set them up. | |
440 | */ | |
441 | offset = cam->fb_offset; | |
442 | for (i = 0; i < cam->n_cap_bufs; i++) { | |
443 | cam->cb_offsets[i] = offset; | |
444 | cam->cb_addrs[i] = cam->fbmem + offset; | |
445 | viacam_write_reg(cam, VCR_VBUF1 + i*4, offset & VCR_VBUF_MASK); | |
446 | offset += cam->sensor_format.sizeimage; | |
447 | } | |
448 | return 0; | |
449 | } | |
450 | ||
451 | /* | |
452 | * Set the scaling register for downscaling the image. | |
453 | * | |
454 | * This register works like this... Vertical scaling is enabled | |
455 | * by bit 26; if that bit is set, downscaling is controlled by the | |
456 | * value in bits 16:25. Those bits are divided by 1024 to get | |
457 | * the scaling factor; setting just bit 25 thus cuts the height | |
458 | * in half. | |
459 | * | |
460 | * Horizontal scaling works about the same, but it's enabled by | |
461 | * bit 11, with bits 0:10 giving the numerator of a fraction | |
462 | * (over 2048) for the scaling value. | |
463 | * | |
464 | * This function is naive in that, if the user departs from | |
465 | * the 3x4 VGA scaling factor, the image will distort. We | |
466 | * could work around that if it really seemed important. | |
467 | */ | |
468 | static void viacam_set_scale(struct via_camera *cam) | |
469 | { | |
470 | unsigned int avscale; | |
471 | int sf; | |
472 | ||
473 | if (cam->user_format.width == VGA_WIDTH) | |
474 | avscale = 0; | |
475 | else { | |
476 | sf = (cam->user_format.width*2048)/VGA_WIDTH; | |
477 | avscale = VCR_AVS_HEN | sf; | |
478 | } | |
479 | if (cam->user_format.height < VGA_HEIGHT) { | |
480 | sf = (1024*cam->user_format.height)/VGA_HEIGHT; | |
481 | avscale |= VCR_AVS_VEN | (sf << 16); | |
482 | } | |
483 | viacam_write_reg(cam, VCR_AVSCALE, avscale); | |
484 | } | |
485 | ||
486 | ||
487 | /* | |
488 | * Configure image-related information into the capture engine. | |
489 | */ | |
490 | static void viacam_ctlr_image(struct via_camera *cam) | |
491 | { | |
492 | int cicreg; | |
493 | ||
494 | /* | |
495 | * Disable clock before messing with stuff - from the via | |
496 | * sample driver. | |
497 | */ | |
498 | viacam_write_reg(cam, VCR_CAPINTC, ~(VCR_CI_ENABLE|VCR_CI_CLKEN)); | |
499 | /* | |
500 | * Set up the controller for VGA resolution, modulo magic | |
501 | * offsets from the via sample driver. | |
502 | */ | |
503 | viacam_write_reg(cam, VCR_HORRANGE, 0x06200120); | |
504 | viacam_write_reg(cam, VCR_VERTRANGE, 0x01de0000); | |
505 | viacam_set_scale(cam); | |
506 | /* | |
507 | * Image size info. | |
508 | */ | |
509 | viacam_write_reg(cam, VCR_MAXDATA, | |
510 | (cam->sensor_format.height << 16) | | |
511 | (cam->sensor_format.bytesperline >> 3)); | |
512 | viacam_write_reg(cam, VCR_MAXVBI, 0); | |
513 | viacam_write_reg(cam, VCR_VSTRIDE, | |
514 | cam->user_format.bytesperline & VCR_VS_STRIDE); | |
515 | /* | |
516 | * Set up the capture interface control register, | |
517 | * everything but the "go" bit. | |
518 | * | |
519 | * The FIFO threshold is a bit of a magic number; 8 is what | |
520 | * VIA's sample code uses. | |
521 | */ | |
522 | cicreg = VCR_CI_CLKEN | | |
523 | 0x08000000 | /* FIFO threshold */ | |
524 | VCR_CI_FLDINV | /* OLPC-specific? */ | |
525 | VCR_CI_VREFINV | /* OLPC-specific? */ | |
526 | VCR_CI_DIBOTH | /* Capture both fields */ | |
527 | VCR_CI_CCIR601_8; | |
528 | if (cam->n_cap_bufs == 3) | |
529 | cicreg |= VCR_CI_3BUFS; | |
530 | /* | |
531 | * YUV formats need different byte swapping than RGB. | |
532 | */ | |
533 | if (cam->user_format.pixelformat == V4L2_PIX_FMT_YUYV) | |
534 | cicreg |= VCR_CI_YUYV; | |
535 | else | |
536 | cicreg |= VCR_CI_UYVY; | |
537 | viacam_write_reg(cam, VCR_CAPINTC, cicreg); | |
538 | } | |
539 | ||
540 | ||
541 | static int viacam_config_controller(struct via_camera *cam) | |
542 | { | |
543 | int ret; | |
544 | unsigned long flags; | |
545 | ||
546 | spin_lock_irqsave(&cam->viadev->reg_lock, flags); | |
547 | ret = viacam_ctlr_cbufs(cam); | |
548 | if (!ret) | |
549 | viacam_ctlr_image(cam); | |
550 | spin_unlock_irqrestore(&cam->viadev->reg_lock, flags); | |
551 | clear_bit(CF_CONFIG_NEEDED, &cam->flags); | |
552 | return ret; | |
553 | } | |
554 | ||
555 | /* | |
556 | * Make it start grabbing data. | |
557 | */ | |
558 | static void viacam_start_engine(struct via_camera *cam) | |
559 | { | |
560 | spin_lock_irq(&cam->viadev->reg_lock); | |
561 | cam->next_buf = 0; | |
562 | viacam_write_reg_mask(cam, VCR_CAPINTC, VCR_CI_ENABLE, VCR_CI_ENABLE); | |
563 | viacam_int_enable(cam); | |
564 | (void) viacam_read_reg(cam, VCR_CAPINTC); /* Force post */ | |
565 | cam->opstate = S_RUNNING; | |
566 | spin_unlock_irq(&cam->viadev->reg_lock); | |
567 | } | |
568 | ||
569 | ||
570 | static void viacam_stop_engine(struct via_camera *cam) | |
571 | { | |
572 | spin_lock_irq(&cam->viadev->reg_lock); | |
573 | viacam_int_disable(cam); | |
574 | viacam_write_reg_mask(cam, VCR_CAPINTC, 0, VCR_CI_ENABLE); | |
575 | (void) viacam_read_reg(cam, VCR_CAPINTC); /* Force post */ | |
576 | cam->opstate = S_IDLE; | |
577 | spin_unlock_irq(&cam->viadev->reg_lock); | |
578 | } | |
579 | ||
580 | ||
581 | /* --------------------------------------------------------------------------*/ | |
582 | /* Videobuf callback ops */ | |
583 | ||
584 | /* | |
585 | * buffer_setup. The purpose of this one would appear to be to tell | |
586 | * videobuf how big a single image is. It's also evidently up to us | |
587 | * to put some sort of limit on the maximum number of buffers allowed. | |
588 | */ | |
589 | static int viacam_vb_buf_setup(struct videobuf_queue *q, | |
590 | unsigned int *count, unsigned int *size) | |
591 | { | |
592 | struct via_camera *cam = q->priv_data; | |
593 | ||
594 | *size = cam->user_format.sizeimage; | |
595 | if (*count == 0 || *count > 6) /* Arbitrary number */ | |
596 | *count = 6; | |
597 | return 0; | |
598 | } | |
599 | ||
600 | /* | |
601 | * Prepare a buffer. | |
602 | */ | |
603 | static int viacam_vb_buf_prepare(struct videobuf_queue *q, | |
604 | struct videobuf_buffer *vb, enum v4l2_field field) | |
605 | { | |
606 | struct via_camera *cam = q->priv_data; | |
607 | ||
608 | vb->size = cam->user_format.sizeimage; | |
609 | vb->width = cam->user_format.width; /* bytesperline???? */ | |
610 | vb->height = cam->user_format.height; | |
611 | vb->field = field; | |
612 | if (vb->state == VIDEOBUF_NEEDS_INIT) { | |
613 | int ret = videobuf_iolock(q, vb, NULL); | |
614 | if (ret) | |
615 | return ret; | |
616 | } | |
617 | vb->state = VIDEOBUF_PREPARED; | |
618 | return 0; | |
619 | } | |
620 | ||
621 | /* | |
622 | * We've got a buffer to put data into. | |
623 | * | |
624 | * FIXME: check for a running engine and valid buffers? | |
625 | */ | |
626 | static void viacam_vb_buf_queue(struct videobuf_queue *q, | |
627 | struct videobuf_buffer *vb) | |
628 | { | |
629 | struct via_camera *cam = q->priv_data; | |
630 | ||
631 | /* | |
632 | * Note that videobuf holds the lock when it calls | |
633 | * us, so we need not (indeed, cannot) take it here. | |
634 | */ | |
635 | vb->state = VIDEOBUF_QUEUED; | |
636 | list_add_tail(&vb->queue, &cam->buffer_queue); | |
637 | } | |
638 | ||
639 | /* | |
640 | * Free a buffer. | |
641 | */ | |
642 | static void viacam_vb_buf_release(struct videobuf_queue *q, | |
643 | struct videobuf_buffer *vb) | |
644 | { | |
645 | struct via_camera *cam = q->priv_data; | |
646 | ||
647 | videobuf_dma_unmap(&cam->platdev->dev, videobuf_to_dma(vb)); | |
648 | videobuf_dma_free(videobuf_to_dma(vb)); | |
649 | vb->state = VIDEOBUF_NEEDS_INIT; | |
650 | } | |
651 | ||
652 | static const struct videobuf_queue_ops viacam_vb_ops = { | |
653 | .buf_setup = viacam_vb_buf_setup, | |
654 | .buf_prepare = viacam_vb_buf_prepare, | |
655 | .buf_queue = viacam_vb_buf_queue, | |
656 | .buf_release = viacam_vb_buf_release, | |
657 | }; | |
658 | ||
659 | /* --------------------------------------------------------------------------*/ | |
660 | /* File operations */ | |
661 | ||
662 | static int viacam_open(struct file *filp) | |
663 | { | |
664 | struct via_camera *cam = video_drvdata(filp); | |
665 | ||
666 | filp->private_data = cam; | |
667 | /* | |
668 | * Note the new user. If this is the first one, we'll also | |
669 | * need to power up the sensor. | |
670 | */ | |
671 | mutex_lock(&cam->lock); | |
672 | if (cam->users == 0) { | |
673 | int ret = viafb_request_dma(); | |
674 | ||
675 | if (ret) { | |
676 | mutex_unlock(&cam->lock); | |
677 | return ret; | |
678 | } | |
679 | via_sensor_power_up(cam); | |
680 | set_bit(CF_CONFIG_NEEDED, &cam->flags); | |
681 | /* | |
682 | * Hook into videobuf. Evidently this cannot fail. | |
683 | */ | |
684 | videobuf_queue_sg_init(&cam->vb_queue, &viacam_vb_ops, | |
685 | &cam->platdev->dev, &cam->viadev->reg_lock, | |
686 | V4L2_BUF_TYPE_VIDEO_CAPTURE, V4L2_FIELD_NONE, | |
687 | sizeof(struct videobuf_buffer), cam, NULL); | |
688 | } | |
689 | (cam->users)++; | |
690 | mutex_unlock(&cam->lock); | |
691 | return 0; | |
692 | } | |
693 | ||
694 | static int viacam_release(struct file *filp) | |
695 | { | |
696 | struct via_camera *cam = video_drvdata(filp); | |
697 | ||
698 | mutex_lock(&cam->lock); | |
699 | (cam->users)--; | |
700 | /* | |
701 | * If the "owner" is closing, shut down any ongoing | |
702 | * operations. | |
703 | */ | |
704 | if (filp == cam->owner) { | |
705 | videobuf_stop(&cam->vb_queue); | |
706 | /* | |
707 | * We don't hold the spinlock here, but, if release() | |
708 | * is being called by the owner, nobody else will | |
709 | * be changing the state. And an extra stop would | |
710 | * not hurt anyway. | |
711 | */ | |
712 | if (cam->opstate != S_IDLE) | |
713 | viacam_stop_engine(cam); | |
714 | cam->owner = NULL; | |
715 | } | |
716 | /* | |
717 | * Last one out needs to turn out the lights. | |
718 | */ | |
719 | if (cam->users == 0) { | |
720 | videobuf_mmap_free(&cam->vb_queue); | |
721 | via_sensor_power_down(cam); | |
722 | viafb_release_dma(); | |
723 | } | |
724 | mutex_unlock(&cam->lock); | |
725 | return 0; | |
726 | } | |
727 | ||
728 | /* | |
729 | * Read a frame from the device. | |
730 | */ | |
731 | static ssize_t viacam_read(struct file *filp, char __user *buffer, | |
732 | size_t len, loff_t *pos) | |
733 | { | |
734 | struct via_camera *cam = video_drvdata(filp); | |
735 | int ret; | |
736 | ||
737 | mutex_lock(&cam->lock); | |
738 | /* | |
739 | * Enforce the V4l2 "only one owner gets to read data" rule. | |
740 | */ | |
741 | if (cam->owner && cam->owner != filp) { | |
742 | ret = -EBUSY; | |
743 | goto out_unlock; | |
744 | } | |
745 | cam->owner = filp; | |
746 | /* | |
747 | * Do we need to configure the hardware? | |
748 | */ | |
749 | if (test_bit(CF_CONFIG_NEEDED, &cam->flags)) { | |
750 | ret = viacam_configure_sensor(cam); | |
751 | if (!ret) | |
752 | ret = viacam_config_controller(cam); | |
753 | if (ret) | |
754 | goto out_unlock; | |
755 | } | |
756 | /* | |
757 | * Fire up the capture engine, then have videobuf do | |
758 | * the heavy lifting. Someday it would be good to avoid | |
759 | * stopping and restarting the engine each time. | |
760 | */ | |
761 | INIT_LIST_HEAD(&cam->buffer_queue); | |
762 | viacam_start_engine(cam); | |
763 | ret = videobuf_read_stream(&cam->vb_queue, buffer, len, pos, 0, | |
764 | filp->f_flags & O_NONBLOCK); | |
765 | viacam_stop_engine(cam); | |
766 | /* videobuf_stop() ?? */ | |
767 | ||
768 | out_unlock: | |
769 | mutex_unlock(&cam->lock); | |
770 | return ret; | |
771 | } | |
772 | ||
773 | ||
774 | static unsigned int viacam_poll(struct file *filp, struct poll_table_struct *pt) | |
775 | { | |
776 | struct via_camera *cam = video_drvdata(filp); | |
777 | ||
778 | return videobuf_poll_stream(filp, &cam->vb_queue, pt); | |
779 | } | |
780 | ||
781 | ||
782 | static int viacam_mmap(struct file *filp, struct vm_area_struct *vma) | |
783 | { | |
784 | struct via_camera *cam = video_drvdata(filp); | |
785 | ||
786 | return videobuf_mmap_mapper(&cam->vb_queue, vma); | |
787 | } | |
788 | ||
789 | ||
790 | ||
791 | static const struct v4l2_file_operations viacam_fops = { | |
792 | .owner = THIS_MODULE, | |
793 | .open = viacam_open, | |
794 | .release = viacam_release, | |
795 | .read = viacam_read, | |
796 | .poll = viacam_poll, | |
797 | .mmap = viacam_mmap, | |
798 | .unlocked_ioctl = video_ioctl2, | |
799 | }; | |
800 | ||
801 | /*----------------------------------------------------------------------------*/ | |
802 | /* | |
803 | * The long list of v4l2 ioctl ops | |
804 | */ | |
805 | ||
806 | static int viacam_g_chip_ident(struct file *file, void *priv, | |
807 | struct v4l2_dbg_chip_ident *ident) | |
808 | { | |
809 | struct via_camera *cam = priv; | |
810 | ||
811 | ident->ident = V4L2_IDENT_NONE; | |
812 | ident->revision = 0; | |
813 | if (v4l2_chip_match_host(&ident->match)) { | |
814 | ident->ident = V4L2_IDENT_VIA_VX855; | |
815 | return 0; | |
816 | } | |
817 | return sensor_call(cam, core, g_chip_ident, ident); | |
818 | } | |
819 | ||
820 | /* | |
821 | * Control ops are passed through to the sensor. | |
822 | */ | |
823 | static int viacam_queryctrl(struct file *filp, void *priv, | |
824 | struct v4l2_queryctrl *qc) | |
825 | { | |
826 | struct via_camera *cam = priv; | |
827 | int ret; | |
828 | ||
829 | mutex_lock(&cam->lock); | |
830 | ret = sensor_call(cam, core, queryctrl, qc); | |
831 | mutex_unlock(&cam->lock); | |
832 | return ret; | |
833 | } | |
834 | ||
835 | ||
836 | static int viacam_g_ctrl(struct file *filp, void *priv, | |
837 | struct v4l2_control *ctrl) | |
838 | { | |
839 | struct via_camera *cam = priv; | |
840 | int ret; | |
841 | ||
842 | mutex_lock(&cam->lock); | |
843 | ret = sensor_call(cam, core, g_ctrl, ctrl); | |
844 | mutex_unlock(&cam->lock); | |
845 | return ret; | |
846 | } | |
847 | ||
848 | ||
849 | static int viacam_s_ctrl(struct file *filp, void *priv, | |
850 | struct v4l2_control *ctrl) | |
851 | { | |
852 | struct via_camera *cam = priv; | |
853 | int ret; | |
854 | ||
855 | mutex_lock(&cam->lock); | |
856 | ret = sensor_call(cam, core, s_ctrl, ctrl); | |
857 | mutex_unlock(&cam->lock); | |
858 | return ret; | |
859 | } | |
860 | ||
861 | /* | |
862 | * Only one input. | |
863 | */ | |
864 | static int viacam_enum_input(struct file *filp, void *priv, | |
865 | struct v4l2_input *input) | |
866 | { | |
867 | if (input->index != 0) | |
868 | return -EINVAL; | |
869 | ||
870 | input->type = V4L2_INPUT_TYPE_CAMERA; | |
871 | input->std = V4L2_STD_ALL; /* Not sure what should go here */ | |
872 | strcpy(input->name, "Camera"); | |
873 | return 0; | |
874 | } | |
875 | ||
876 | static int viacam_g_input(struct file *filp, void *priv, unsigned int *i) | |
877 | { | |
878 | *i = 0; | |
879 | return 0; | |
880 | } | |
881 | ||
882 | static int viacam_s_input(struct file *filp, void *priv, unsigned int i) | |
883 | { | |
884 | if (i != 0) | |
885 | return -EINVAL; | |
886 | return 0; | |
887 | } | |
888 | ||
889 | static int viacam_s_std(struct file *filp, void *priv, v4l2_std_id *std) | |
890 | { | |
891 | return 0; | |
892 | } | |
893 | ||
894 | /* | |
895 | * Video format stuff. Here is our default format until | |
896 | * user space messes with things. | |
897 | */ | |
898 | static const struct v4l2_pix_format viacam_def_pix_format = { | |
899 | .width = VGA_WIDTH, | |
900 | .height = VGA_HEIGHT, | |
901 | .pixelformat = V4L2_PIX_FMT_YUYV, | |
902 | .field = V4L2_FIELD_NONE, | |
903 | .bytesperline = VGA_WIDTH * 2, | |
904 | .sizeimage = VGA_WIDTH * VGA_HEIGHT * 2, | |
905 | }; | |
906 | ||
907 | static const enum v4l2_mbus_pixelcode via_def_mbus_code = V4L2_MBUS_FMT_YUYV8_2X8; | |
908 | ||
909 | static int viacam_enum_fmt_vid_cap(struct file *filp, void *priv, | |
910 | struct v4l2_fmtdesc *fmt) | |
911 | { | |
912 | if (fmt->index >= N_VIA_FMTS) | |
913 | return -EINVAL; | |
914 | strlcpy(fmt->description, via_formats[fmt->index].desc, | |
915 | sizeof(fmt->description)); | |
916 | fmt->pixelformat = via_formats[fmt->index].pixelformat; | |
917 | return 0; | |
918 | } | |
919 | ||
920 | /* | |
921 | * Figure out proper image dimensions, but always force the | |
922 | * sensor to VGA. | |
923 | */ | |
924 | static void viacam_fmt_pre(struct v4l2_pix_format *userfmt, | |
925 | struct v4l2_pix_format *sensorfmt) | |
926 | { | |
927 | *sensorfmt = *userfmt; | |
928 | if (userfmt->width < QCIF_WIDTH || userfmt->height < QCIF_HEIGHT) { | |
929 | userfmt->width = QCIF_WIDTH; | |
930 | userfmt->height = QCIF_HEIGHT; | |
931 | } | |
932 | if (userfmt->width > VGA_WIDTH || userfmt->height > VGA_HEIGHT) { | |
933 | userfmt->width = VGA_WIDTH; | |
934 | userfmt->height = VGA_HEIGHT; | |
935 | } | |
936 | sensorfmt->width = VGA_WIDTH; | |
937 | sensorfmt->height = VGA_HEIGHT; | |
938 | } | |
939 | ||
940 | static void viacam_fmt_post(struct v4l2_pix_format *userfmt, | |
941 | struct v4l2_pix_format *sensorfmt) | |
942 | { | |
943 | struct via_format *f = via_find_format(userfmt->pixelformat); | |
944 | ||
945 | sensorfmt->bytesperline = sensorfmt->width * f->bpp; | |
946 | sensorfmt->sizeimage = sensorfmt->height * sensorfmt->bytesperline; | |
947 | userfmt->pixelformat = sensorfmt->pixelformat; | |
948 | userfmt->field = sensorfmt->field; | |
949 | userfmt->bytesperline = 2 * userfmt->width; | |
950 | userfmt->sizeimage = userfmt->bytesperline * userfmt->height; | |
951 | } | |
952 | ||
953 | ||
954 | /* | |
955 | * The real work of figuring out a workable format. | |
956 | */ | |
957 | static int viacam_do_try_fmt(struct via_camera *cam, | |
958 | struct v4l2_pix_format *upix, struct v4l2_pix_format *spix) | |
959 | { | |
960 | int ret; | |
961 | struct v4l2_mbus_framefmt mbus_fmt; | |
962 | struct via_format *f = via_find_format(upix->pixelformat); | |
963 | ||
964 | upix->pixelformat = f->pixelformat; | |
965 | viacam_fmt_pre(upix, spix); | |
966 | v4l2_fill_mbus_format(&mbus_fmt, upix, f->mbus_code); | |
967 | ret = sensor_call(cam, video, try_mbus_fmt, &mbus_fmt); | |
968 | v4l2_fill_pix_format(spix, &mbus_fmt); | |
969 | viacam_fmt_post(upix, spix); | |
970 | return ret; | |
971 | } | |
972 | ||
973 | ||
974 | ||
975 | static int viacam_try_fmt_vid_cap(struct file *filp, void *priv, | |
976 | struct v4l2_format *fmt) | |
977 | { | |
978 | struct via_camera *cam = priv; | |
979 | struct v4l2_format sfmt; | |
980 | int ret; | |
981 | ||
982 | mutex_lock(&cam->lock); | |
983 | ret = viacam_do_try_fmt(cam, &fmt->fmt.pix, &sfmt.fmt.pix); | |
984 | mutex_unlock(&cam->lock); | |
985 | return ret; | |
986 | } | |
987 | ||
988 | ||
989 | static int viacam_g_fmt_vid_cap(struct file *filp, void *priv, | |
990 | struct v4l2_format *fmt) | |
991 | { | |
992 | struct via_camera *cam = priv; | |
993 | ||
994 | mutex_lock(&cam->lock); | |
995 | fmt->fmt.pix = cam->user_format; | |
996 | mutex_unlock(&cam->lock); | |
997 | return 0; | |
998 | } | |
999 | ||
1000 | static int viacam_s_fmt_vid_cap(struct file *filp, void *priv, | |
1001 | struct v4l2_format *fmt) | |
1002 | { | |
1003 | struct via_camera *cam = priv; | |
1004 | int ret; | |
1005 | struct v4l2_format sfmt; | |
1006 | struct via_format *f = via_find_format(fmt->fmt.pix.pixelformat); | |
1007 | ||
1008 | /* | |
1009 | * Camera must be idle or we can't mess with the | |
1010 | * video setup. | |
1011 | */ | |
1012 | mutex_lock(&cam->lock); | |
1013 | if (cam->opstate != S_IDLE) { | |
1014 | ret = -EBUSY; | |
1015 | goto out; | |
1016 | } | |
1017 | /* | |
1018 | * Let the sensor code look over and tweak the | |
1019 | * requested formatting. | |
1020 | */ | |
1021 | ret = viacam_do_try_fmt(cam, &fmt->fmt.pix, &sfmt.fmt.pix); | |
1022 | if (ret) | |
1023 | goto out; | |
1024 | /* | |
1025 | * OK, let's commit to the new format. | |
1026 | */ | |
1027 | cam->user_format = fmt->fmt.pix; | |
1028 | cam->sensor_format = sfmt.fmt.pix; | |
1029 | cam->mbus_code = f->mbus_code; | |
1030 | ret = viacam_configure_sensor(cam); | |
1031 | if (!ret) | |
1032 | ret = viacam_config_controller(cam); | |
1033 | out: | |
1034 | mutex_unlock(&cam->lock); | |
1035 | return ret; | |
1036 | } | |
1037 | ||
1038 | static int viacam_querycap(struct file *filp, void *priv, | |
1039 | struct v4l2_capability *cap) | |
1040 | { | |
1041 | strcpy(cap->driver, "via-camera"); | |
1042 | strcpy(cap->card, "via-camera"); | |
1043 | cap->version = 1; | |
1044 | cap->capabilities = V4L2_CAP_VIDEO_CAPTURE | | |
1045 | V4L2_CAP_READWRITE | V4L2_CAP_STREAMING; | |
1046 | return 0; | |
1047 | } | |
1048 | ||
1049 | /* | |
1050 | * Streaming operations - pure videobuf stuff. | |
1051 | */ | |
1052 | static int viacam_reqbufs(struct file *filp, void *priv, | |
1053 | struct v4l2_requestbuffers *rb) | |
1054 | { | |
1055 | struct via_camera *cam = priv; | |
1056 | ||
1057 | return videobuf_reqbufs(&cam->vb_queue, rb); | |
1058 | } | |
1059 | ||
1060 | static int viacam_querybuf(struct file *filp, void *priv, | |
1061 | struct v4l2_buffer *buf) | |
1062 | { | |
1063 | struct via_camera *cam = priv; | |
1064 | ||
1065 | return videobuf_querybuf(&cam->vb_queue, buf); | |
1066 | } | |
1067 | ||
1068 | static int viacam_qbuf(struct file *filp, void *priv, struct v4l2_buffer *buf) | |
1069 | { | |
1070 | struct via_camera *cam = priv; | |
1071 | ||
1072 | return videobuf_qbuf(&cam->vb_queue, buf); | |
1073 | } | |
1074 | ||
1075 | static int viacam_dqbuf(struct file *filp, void *priv, struct v4l2_buffer *buf) | |
1076 | { | |
1077 | struct via_camera *cam = priv; | |
1078 | ||
1079 | return videobuf_dqbuf(&cam->vb_queue, buf, filp->f_flags & O_NONBLOCK); | |
1080 | } | |
1081 | ||
1082 | static int viacam_streamon(struct file *filp, void *priv, enum v4l2_buf_type t) | |
1083 | { | |
1084 | struct via_camera *cam = priv; | |
1085 | int ret = 0; | |
1086 | ||
1087 | if (t != V4L2_BUF_TYPE_VIDEO_CAPTURE) | |
1088 | return -EINVAL; | |
1089 | ||
1090 | mutex_lock(&cam->lock); | |
1091 | if (cam->opstate != S_IDLE) { | |
1092 | ret = -EBUSY; | |
1093 | goto out; | |
1094 | } | |
1095 | /* | |
1096 | * Enforce the V4l2 "only one owner gets to read data" rule. | |
1097 | */ | |
1098 | if (cam->owner && cam->owner != filp) { | |
1099 | ret = -EBUSY; | |
1100 | goto out; | |
1101 | } | |
1102 | cam->owner = filp; | |
1103 | /* | |
1104 | * Configure things if need be. | |
1105 | */ | |
1106 | if (test_bit(CF_CONFIG_NEEDED, &cam->flags)) { | |
1107 | ret = viacam_configure_sensor(cam); | |
1108 | if (ret) | |
1109 | goto out; | |
1110 | ret = viacam_config_controller(cam); | |
1111 | if (ret) | |
1112 | goto out; | |
1113 | } | |
1114 | /* | |
1115 | * If the CPU goes into C3, the DMA transfer gets corrupted and | |
1116 | * users start filing unsightly bug reports. Put in a "latency" | |
1117 | * requirement which will keep the CPU out of the deeper sleep | |
1118 | * states. | |
1119 | */ | |
1120 | pm_qos_add_request(&cam->qos_request, PM_QOS_CPU_DMA_LATENCY, 50); | |
1121 | /* | |
1122 | * Fire things up. | |
1123 | */ | |
1124 | INIT_LIST_HEAD(&cam->buffer_queue); | |
1125 | ret = videobuf_streamon(&cam->vb_queue); | |
1126 | if (!ret) | |
1127 | viacam_start_engine(cam); | |
1128 | out: | |
1129 | mutex_unlock(&cam->lock); | |
1130 | return ret; | |
1131 | } | |
1132 | ||
1133 | static int viacam_streamoff(struct file *filp, void *priv, enum v4l2_buf_type t) | |
1134 | { | |
1135 | struct via_camera *cam = priv; | |
1136 | int ret; | |
1137 | ||
1138 | if (t != V4L2_BUF_TYPE_VIDEO_CAPTURE) | |
1139 | return -EINVAL; | |
1140 | mutex_lock(&cam->lock); | |
1141 | if (cam->opstate != S_RUNNING) { | |
1142 | ret = -EINVAL; | |
1143 | goto out; | |
1144 | } | |
1145 | pm_qos_remove_request(&cam->qos_request); | |
1146 | viacam_stop_engine(cam); | |
1147 | /* | |
1148 | * Videobuf will recycle all of the outstanding buffers, but | |
1149 | * we should be sure we don't retain any references to | |
1150 | * any of them. | |
1151 | */ | |
1152 | ret = videobuf_streamoff(&cam->vb_queue); | |
1153 | INIT_LIST_HEAD(&cam->buffer_queue); | |
1154 | out: | |
1155 | mutex_unlock(&cam->lock); | |
1156 | return ret; | |
1157 | } | |
1158 | ||
024fafba JC |
1159 | /* G/S_PARM */ |
1160 | ||
1161 | static int viacam_g_parm(struct file *filp, void *priv, | |
1162 | struct v4l2_streamparm *parm) | |
1163 | { | |
1164 | struct via_camera *cam = priv; | |
1165 | int ret; | |
1166 | ||
1167 | mutex_lock(&cam->lock); | |
1168 | ret = sensor_call(cam, video, g_parm, parm); | |
1169 | mutex_unlock(&cam->lock); | |
1170 | parm->parm.capture.readbuffers = cam->n_cap_bufs; | |
1171 | return ret; | |
1172 | } | |
1173 | ||
1174 | static int viacam_s_parm(struct file *filp, void *priv, | |
1175 | struct v4l2_streamparm *parm) | |
1176 | { | |
1177 | struct via_camera *cam = priv; | |
1178 | int ret; | |
1179 | ||
1180 | mutex_lock(&cam->lock); | |
1181 | ret = sensor_call(cam, video, s_parm, parm); | |
1182 | mutex_unlock(&cam->lock); | |
1183 | parm->parm.capture.readbuffers = cam->n_cap_bufs; | |
1184 | return ret; | |
1185 | } | |
1186 | ||
1187 | static int viacam_enum_framesizes(struct file *filp, void *priv, | |
1188 | struct v4l2_frmsizeenum *sizes) | |
1189 | { | |
1190 | if (sizes->index != 0) | |
1191 | return -EINVAL; | |
1192 | sizes->type = V4L2_FRMSIZE_TYPE_CONTINUOUS; | |
1193 | sizes->stepwise.min_width = QCIF_WIDTH; | |
1194 | sizes->stepwise.min_height = QCIF_HEIGHT; | |
1195 | sizes->stepwise.max_width = VGA_WIDTH; | |
1196 | sizes->stepwise.max_height = VGA_HEIGHT; | |
1197 | sizes->stepwise.step_width = sizes->stepwise.step_height = 1; | |
1198 | return 0; | |
1199 | } | |
1200 | ||
1201 | static int viacam_enum_frameintervals(struct file *filp, void *priv, | |
1202 | struct v4l2_frmivalenum *interval) | |
1203 | { | |
1204 | struct via_camera *cam = priv; | |
1205 | int ret; | |
1206 | ||
1207 | mutex_lock(&cam->lock); | |
1208 | ret = sensor_call(cam, video, enum_frameintervals, interval); | |
1209 | mutex_unlock(&cam->lock); | |
1210 | return ret; | |
1211 | } | |
1212 | ||
1213 | ||
1214 | ||
1215 | static const struct v4l2_ioctl_ops viacam_ioctl_ops = { | |
1216 | .vidioc_g_chip_ident = viacam_g_chip_ident, | |
1217 | .vidioc_queryctrl = viacam_queryctrl, | |
1218 | .vidioc_g_ctrl = viacam_g_ctrl, | |
1219 | .vidioc_s_ctrl = viacam_s_ctrl, | |
1220 | .vidioc_enum_input = viacam_enum_input, | |
1221 | .vidioc_g_input = viacam_g_input, | |
1222 | .vidioc_s_input = viacam_s_input, | |
1223 | .vidioc_s_std = viacam_s_std, | |
1224 | .vidioc_enum_fmt_vid_cap = viacam_enum_fmt_vid_cap, | |
1225 | .vidioc_try_fmt_vid_cap = viacam_try_fmt_vid_cap, | |
1226 | .vidioc_g_fmt_vid_cap = viacam_g_fmt_vid_cap, | |
1227 | .vidioc_s_fmt_vid_cap = viacam_s_fmt_vid_cap, | |
1228 | .vidioc_querycap = viacam_querycap, | |
1229 | .vidioc_reqbufs = viacam_reqbufs, | |
1230 | .vidioc_querybuf = viacam_querybuf, | |
1231 | .vidioc_qbuf = viacam_qbuf, | |
1232 | .vidioc_dqbuf = viacam_dqbuf, | |
1233 | .vidioc_streamon = viacam_streamon, | |
1234 | .vidioc_streamoff = viacam_streamoff, | |
1235 | .vidioc_g_parm = viacam_g_parm, | |
1236 | .vidioc_s_parm = viacam_s_parm, | |
1237 | .vidioc_enum_framesizes = viacam_enum_framesizes, | |
1238 | .vidioc_enum_frameintervals = viacam_enum_frameintervals, | |
024fafba JC |
1239 | }; |
1240 | ||
1241 | /*----------------------------------------------------------------------------*/ | |
1242 | ||
1243 | /* | |
1244 | * Power management. | |
1245 | */ | |
0522921c DD |
1246 | #ifdef CONFIG_PM |
1247 | ||
1248 | static int viacam_suspend(void *priv) | |
1249 | { | |
1250 | struct via_camera *cam = priv; | |
1251 | enum viacam_opstate state = cam->opstate; | |
1252 | ||
1253 | if (cam->opstate != S_IDLE) { | |
1254 | viacam_stop_engine(cam); | |
1255 | cam->opstate = state; /* So resume restarts */ | |
1256 | } | |
1257 | ||
1258 | return 0; | |
1259 | } | |
1260 | ||
1261 | static int viacam_resume(void *priv) | |
1262 | { | |
1263 | struct via_camera *cam = priv; | |
1264 | int ret = 0; | |
1265 | ||
1266 | /* | |
1267 | * Get back to a reasonable operating state. | |
1268 | */ | |
1269 | via_write_reg_mask(VIASR, 0x78, 0, 0x80); | |
1270 | via_write_reg_mask(VIASR, 0x1e, 0xc0, 0xc0); | |
1271 | viacam_int_disable(cam); | |
1272 | set_bit(CF_CONFIG_NEEDED, &cam->flags); | |
1273 | /* | |
1274 | * Make sure the sensor's power state is correct | |
1275 | */ | |
1276 | if (cam->users > 0) | |
1277 | via_sensor_power_up(cam); | |
1278 | else | |
1279 | via_sensor_power_down(cam); | |
1280 | /* | |
1281 | * If it was operating, try to restart it. | |
1282 | */ | |
1283 | if (cam->opstate != S_IDLE) { | |
1284 | mutex_lock(&cam->lock); | |
1285 | ret = viacam_configure_sensor(cam); | |
1286 | if (!ret) | |
1287 | ret = viacam_config_controller(cam); | |
1288 | mutex_unlock(&cam->lock); | |
1289 | if (!ret) | |
1290 | viacam_start_engine(cam); | |
1291 | } | |
1292 | ||
1293 | return ret; | |
1294 | } | |
1295 | ||
1296 | static struct viafb_pm_hooks viacam_pm_hooks = { | |
1297 | .suspend = viacam_suspend, | |
1298 | .resume = viacam_resume | |
1299 | }; | |
1300 | ||
1301 | #endif /* CONFIG_PM */ | |
024fafba JC |
1302 | |
1303 | /* | |
1304 | * Setup stuff. | |
1305 | */ | |
1306 | ||
1307 | static struct video_device viacam_v4l_template = { | |
1308 | .name = "via-camera", | |
1309 | .minor = -1, | |
1310 | .tvnorms = V4L2_STD_NTSC_M, | |
1311 | .current_norm = V4L2_STD_NTSC_M, | |
1312 | .fops = &viacam_fops, | |
1313 | .ioctl_ops = &viacam_ioctl_ops, | |
1314 | .release = video_device_release_empty, /* Check this */ | |
1315 | }; | |
1316 | ||
c6384c88 DD |
1317 | /* |
1318 | * The OLPC folks put the serial port on the same pin as | |
1319 | * the camera. They also get grumpy if we break the | |
1320 | * serial port and keep them from using it. So we have | |
1321 | * to check the serial enable bit and not step on it. | |
1322 | */ | |
1323 | #define VIACAM_SERIAL_DEVFN 0x88 | |
1324 | #define VIACAM_SERIAL_CREG 0x46 | |
1325 | #define VIACAM_SERIAL_BIT 0x40 | |
1326 | ||
1327 | static __devinit bool viacam_serial_is_enabled(void) | |
1328 | { | |
1329 | struct pci_bus *pbus = pci_find_bus(0, 0); | |
1330 | u8 cbyte; | |
1331 | ||
c8814df3 JJ |
1332 | if (!pbus) |
1333 | return false; | |
c6384c88 DD |
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 | 1350 | |
a39fbb1d DD |
1351 | static struct ov7670_config sensor_cfg = { |
1352 | /* The XO-1.5 (only known user) clocks the camera at 90MHz. */ | |
1353 | .clock_speed = 90, | |
1354 | }; | |
1355 | ||
024fafba JC |
1356 | static __devinit int viacam_probe(struct platform_device *pdev) |
1357 | { | |
1358 | int ret; | |
1359 | struct i2c_adapter *sensor_adapter; | |
1360 | struct viafb_dev *viadev = pdev->dev.platform_data; | |
a39fbb1d DD |
1361 | struct i2c_board_info ov7670_info = { |
1362 | .type = "ov7670", | |
1363 | .addr = 0x42 >> 1, | |
1364 | .platform_data = &sensor_cfg, | |
1365 | }; | |
024fafba JC |
1366 | |
1367 | /* | |
1368 | * Note that there are actually two capture channels on | |
1369 | * the device. We only deal with one for now. That | |
1370 | * is encoded here; nothing else assumes it's dealing with | |
1371 | * a unique capture device. | |
1372 | */ | |
1373 | struct via_camera *cam; | |
1374 | ||
1375 | /* | |
1376 | * Ensure that frame buffer memory has been set aside for | |
1377 | * this purpose. As an arbitrary limit, refuse to work | |
1378 | * with less than two frames of VGA 16-bit data. | |
1379 | * | |
1380 | * If we ever support the second port, we'll need to set | |
1381 | * aside more memory. | |
1382 | */ | |
1383 | if (viadev->camera_fbmem_size < (VGA_HEIGHT*VGA_WIDTH*4)) { | |
1384 | printk(KERN_ERR "viacam: insufficient FB memory reserved\n"); | |
1385 | return -ENOMEM; | |
1386 | } | |
1387 | if (viadev->engine_mmio == NULL) { | |
1388 | printk(KERN_ERR "viacam: No I/O memory, so no pictures\n"); | |
1389 | return -ENOMEM; | |
1390 | } | |
c6384c88 DD |
1391 | |
1392 | if (machine_is_olpc() && viacam_serial_is_enabled()) | |
1393 | return -EBUSY; | |
1394 | ||
024fafba JC |
1395 | /* |
1396 | * Basic structure initialization. | |
1397 | */ | |
1398 | cam = kzalloc (sizeof(struct via_camera), GFP_KERNEL); | |
1399 | if (cam == NULL) | |
1400 | return -ENOMEM; | |
1401 | via_cam_info = cam; | |
1402 | cam->platdev = pdev; | |
1403 | cam->viadev = viadev; | |
1404 | cam->users = 0; | |
1405 | cam->owner = NULL; | |
1406 | cam->opstate = S_IDLE; | |
1407 | cam->user_format = cam->sensor_format = viacam_def_pix_format; | |
1408 | mutex_init(&cam->lock); | |
1409 | INIT_LIST_HEAD(&cam->buffer_queue); | |
1410 | cam->mmio = viadev->engine_mmio; | |
1411 | cam->fbmem = viadev->fbmem; | |
1412 | cam->fb_offset = viadev->camera_fbmem_offset; | |
1413 | cam->flags = 1 << CF_CONFIG_NEEDED; | |
1414 | cam->mbus_code = via_def_mbus_code; | |
1415 | /* | |
1416 | * Tell V4L that we exist. | |
1417 | */ | |
1418 | ret = v4l2_device_register(&pdev->dev, &cam->v4l2_dev); | |
1419 | if (ret) { | |
1420 | dev_err(&pdev->dev, "Unable to register v4l2 device\n"); | |
1421 | return ret; | |
1422 | } | |
1423 | /* | |
1424 | * Convince the system that we can do DMA. | |
1425 | */ | |
1426 | pdev->dev.dma_mask = &viadev->pdev->dma_mask; | |
1427 | dma_set_mask(&pdev->dev, 0xffffffff); | |
1428 | /* | |
1429 | * Fire up the capture port. The write to 0x78 looks purely | |
1430 | * OLPCish; any system will need to tweak 0x1e. | |
1431 | */ | |
1432 | via_write_reg_mask(VIASR, 0x78, 0, 0x80); | |
1433 | via_write_reg_mask(VIASR, 0x1e, 0xc0, 0xc0); | |
1434 | /* | |
1435 | * Get the sensor powered up. | |
1436 | */ | |
1437 | ret = via_sensor_power_setup(cam); | |
1438 | if (ret) | |
1439 | goto out_unregister; | |
1440 | via_sensor_power_up(cam); | |
1441 | ||
1442 | /* | |
1443 | * See if we can't find it on the bus. The VIA_PORT_31 assumption | |
1444 | * is OLPC-specific. 0x42 assumption is ov7670-specific. | |
1445 | */ | |
1446 | sensor_adapter = viafb_find_i2c_adapter(VIA_PORT_31); | |
a39fbb1d DD |
1447 | cam->sensor = v4l2_i2c_new_subdev_board(&cam->v4l2_dev, sensor_adapter, |
1448 | &ov7670_info, NULL); | |
024fafba JC |
1449 | if (cam->sensor == NULL) { |
1450 | dev_err(&pdev->dev, "Unable to find the sensor!\n"); | |
1451 | ret = -ENODEV; | |
1452 | goto out_power_down; | |
1453 | } | |
1454 | /* | |
1455 | * Get the IRQ. | |
1456 | */ | |
1457 | viacam_int_disable(cam); | |
1458 | ret = request_threaded_irq(viadev->pdev->irq, viacam_quick_irq, | |
1459 | viacam_irq, IRQF_SHARED, "via-camera", cam); | |
1460 | if (ret) | |
1461 | goto out_power_down; | |
1462 | /* | |
1463 | * Tell V4l2 that we exist. | |
1464 | */ | |
1465 | cam->vdev = viacam_v4l_template; | |
1466 | cam->vdev.v4l2_dev = &cam->v4l2_dev; | |
1467 | ret = video_register_device(&cam->vdev, VFL_TYPE_GRABBER, -1); | |
1468 | if (ret) | |
1469 | goto out_irq; | |
1470 | video_set_drvdata(&cam->vdev, cam); | |
1471 | ||
0522921c DD |
1472 | #ifdef CONFIG_PM |
1473 | /* | |
1474 | * Hook into PM events | |
1475 | */ | |
1476 | viacam_pm_hooks.private = cam; | |
1477 | viafb_pm_register(&viacam_pm_hooks); | |
1478 | #endif | |
1479 | ||
024fafba JC |
1480 | /* Power the sensor down until somebody opens the device */ |
1481 | via_sensor_power_down(cam); | |
1482 | return 0; | |
1483 | ||
1484 | out_irq: | |
1485 | free_irq(viadev->pdev->irq, cam); | |
1486 | out_power_down: | |
1487 | via_sensor_power_release(cam); | |
1488 | out_unregister: | |
1489 | v4l2_device_unregister(&cam->v4l2_dev); | |
1490 | return ret; | |
1491 | } | |
1492 | ||
1493 | static __devexit int viacam_remove(struct platform_device *pdev) | |
1494 | { | |
1495 | struct via_camera *cam = via_cam_info; | |
1496 | struct viafb_dev *viadev = pdev->dev.platform_data; | |
1497 | ||
1498 | video_unregister_device(&cam->vdev); | |
1499 | v4l2_device_unregister(&cam->v4l2_dev); | |
1500 | free_irq(viadev->pdev->irq, cam); | |
1501 | via_sensor_power_release(cam); | |
1502 | via_cam_info = NULL; | |
1503 | return 0; | |
1504 | } | |
1505 | ||
024fafba JC |
1506 | static struct platform_driver viacam_driver = { |
1507 | .driver = { | |
1508 | .name = "viafb-camera", | |
1509 | }, | |
1510 | .probe = viacam_probe, | |
1511 | .remove = viacam_remove, | |
1512 | }; | |
1513 | ||
1d6629b1 | 1514 | module_platform_driver(viacam_driver); |