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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> | |
21 | #include <media/videobuf-dma-sg.h> | |
024fafba JC |
22 | #include <linux/delay.h> |
23 | #include <linux/dma-mapping.h> | |
e8db0be1 | 24 | #include <linux/pm_qos.h> |
024fafba JC |
25 | #include <linux/via-core.h> |
26 | #include <linux/via-gpio.h> | |
27 | #include <linux/via_i2c.h> | |
c6384c88 | 28 | #include <asm/olpc.h> |
024fafba JC |
29 | |
30 | #include "via-camera.h" | |
31 | ||
027e99ab | 32 | MODULE_ALIAS("platform:viafb-camera"); |
024fafba JC |
33 | MODULE_AUTHOR("Jonathan Corbet <corbet@lwn.net>"); |
34 | MODULE_DESCRIPTION("VIA framebuffer-based camera controller driver"); | |
35 | MODULE_LICENSE("GPL"); | |
36 | ||
90ab5ee9 | 37 | static bool flip_image; |
024fafba JC |
38 | module_param(flip_image, bool, 0444); |
39 | MODULE_PARM_DESC(flip_image, | |
40 | "If set, the sensor will be instructed to flip the image " | |
41 | "vertically."); | |
42 | ||
90ab5ee9 | 43 | static bool override_serial; |
024fafba JC |
44 | module_param(override_serial, bool, 0444); |
45 | MODULE_PARM_DESC(override_serial, | |
46 | "The camera driver will normally refuse to load if " | |
47 | "the XO 1.5 serial port is enabled. Set this option " | |
c6384c88 | 48 | "to force-enable the camera."); |
024fafba JC |
49 | |
50 | /* | |
51 | * Basic window sizes. | |
52 | */ | |
53 | #define VGA_WIDTH 640 | |
54 | #define VGA_HEIGHT 480 | |
55 | #define QCIF_WIDTH 176 | |
56 | #define QCIF_HEIGHT 144 | |
57 | ||
58 | /* | |
59 | * The structure describing our camera. | |
60 | */ | |
61 | enum viacam_opstate { S_IDLE = 0, S_RUNNING = 1 }; | |
62 | ||
63 | struct via_camera { | |
64 | struct v4l2_device v4l2_dev; | |
65 | struct video_device vdev; | |
66 | struct v4l2_subdev *sensor; | |
67 | struct platform_device *platdev; | |
68 | struct viafb_dev *viadev; | |
69 | struct mutex lock; | |
70 | enum viacam_opstate opstate; | |
71 | unsigned long flags; | |
cc749986 | 72 | struct pm_qos_request qos_request; |
024fafba JC |
73 | /* |
74 | * GPIO info for power/reset management | |
75 | */ | |
76 | int power_gpio; | |
77 | int reset_gpio; | |
78 | /* | |
79 | * I/O memory stuff. | |
80 | */ | |
81 | void __iomem *mmio; /* Where the registers live */ | |
82 | void __iomem *fbmem; /* Frame buffer memory */ | |
83 | u32 fb_offset; /* Reserved memory offset (FB) */ | |
84 | /* | |
85 | * Capture buffers and related. The controller supports | |
86 | * up to three, so that's what we have here. These buffers | |
87 | * live in frame buffer memory, so we don't call them "DMA". | |
88 | */ | |
89 | unsigned int cb_offsets[3]; /* offsets into fb mem */ | |
90 | u8 *cb_addrs[3]; /* Kernel-space addresses */ | |
91 | int n_cap_bufs; /* How many are we using? */ | |
92 | int next_buf; | |
93 | struct videobuf_queue vb_queue; | |
94 | struct list_head buffer_queue; /* prot. by reg_lock */ | |
95 | /* | |
96 | * User tracking. | |
97 | */ | |
98 | int users; | |
99 | struct file *owner; | |
100 | /* | |
101 | * Video format information. sensor_format is kept in a form | |
102 | * that we can use to pass to the sensor. We always run the | |
103 | * sensor in VGA resolution, though, and let the controller | |
104 | * downscale things if need be. So we keep the "real* | |
105 | * dimensions separately. | |
106 | */ | |
107 | struct v4l2_pix_format sensor_format; | |
108 | struct v4l2_pix_format user_format; | |
109 | enum v4l2_mbus_pixelcode mbus_code; | |
110 | }; | |
111 | ||
112 | /* | |
113 | * Yes, this is a hack, but there's only going to be one of these | |
114 | * on any system we know of. | |
115 | */ | |
116 | static struct via_camera *via_cam_info; | |
117 | ||
118 | /* | |
119 | * Flag values, manipulated with bitops | |
120 | */ | |
121 | #define CF_DMA_ACTIVE 0 /* A frame is incoming */ | |
122 | #define CF_CONFIG_NEEDED 1 /* Must configure hardware */ | |
123 | ||
124 | ||
125 | /* | |
126 | * Nasty ugly v4l2 boilerplate. | |
127 | */ | |
128 | #define sensor_call(cam, optype, func, args...) \ | |
129 | v4l2_subdev_call(cam->sensor, optype, func, ##args) | |
130 | ||
131 | /* | |
132 | * Debugging and related. | |
133 | */ | |
134 | #define cam_err(cam, fmt, arg...) \ | |
135 | dev_err(&(cam)->platdev->dev, fmt, ##arg); | |
136 | #define cam_warn(cam, fmt, arg...) \ | |
137 | dev_warn(&(cam)->platdev->dev, fmt, ##arg); | |
138 | #define cam_dbg(cam, fmt, arg...) \ | |
139 | dev_dbg(&(cam)->platdev->dev, fmt, ##arg); | |
140 | ||
141 | /* | |
142 | * Format handling. This is ripped almost directly from Hans's changes | |
143 | * to cafe_ccic.c. It's a little unfortunate; until this change, we | |
144 | * didn't need to know anything about the format except its byte depth; | |
145 | * now this information must be managed at this level too. | |
146 | */ | |
147 | static struct via_format { | |
148 | __u8 *desc; | |
149 | __u32 pixelformat; | |
150 | int bpp; /* Bytes per pixel */ | |
151 | enum v4l2_mbus_pixelcode mbus_code; | |
152 | } via_formats[] = { | |
153 | { | |
154 | .desc = "YUYV 4:2:2", | |
155 | .pixelformat = V4L2_PIX_FMT_YUYV, | |
156 | .mbus_code = V4L2_MBUS_FMT_YUYV8_2X8, | |
157 | .bpp = 2, | |
158 | }, | |
159 | { | |
160 | .desc = "RGB 565", | |
161 | .pixelformat = V4L2_PIX_FMT_RGB565, | |
162 | .mbus_code = V4L2_MBUS_FMT_RGB565_2X8_LE, | |
163 | .bpp = 2, | |
164 | }, | |
165 | /* RGB444 and Bayer should be doable, but have never been | |
166 | tested with this driver. */ | |
167 | }; | |
168 | #define N_VIA_FMTS ARRAY_SIZE(via_formats) | |
169 | ||
170 | static struct via_format *via_find_format(u32 pixelformat) | |
171 | { | |
172 | unsigned i; | |
173 | ||
174 | for (i = 0; i < N_VIA_FMTS; i++) | |
175 | if (via_formats[i].pixelformat == pixelformat) | |
176 | return via_formats + i; | |
177 | /* Not found? Then return the first format. */ | |
178 | return via_formats; | |
179 | } | |
180 | ||
181 | ||
182 | /*--------------------------------------------------------------------------*/ | |
183 | /* | |
184 | * Sensor power/reset management. This piece is OLPC-specific for | |
185 | * sure; other configurations will have things connected differently. | |
186 | */ | |
187 | static int via_sensor_power_setup(struct via_camera *cam) | |
188 | { | |
189 | int ret; | |
190 | ||
191 | cam->power_gpio = viafb_gpio_lookup("VGPIO3"); | |
192 | cam->reset_gpio = viafb_gpio_lookup("VGPIO2"); | |
193 | if (cam->power_gpio < 0 || cam->reset_gpio < 0) { | |
194 | dev_err(&cam->platdev->dev, "Unable to find GPIO lines\n"); | |
195 | return -EINVAL; | |
196 | } | |
197 | ret = gpio_request(cam->power_gpio, "viafb-camera"); | |
198 | if (ret) { | |
199 | dev_err(&cam->platdev->dev, "Unable to request power GPIO\n"); | |
200 | return ret; | |
201 | } | |
202 | ret = gpio_request(cam->reset_gpio, "viafb-camera"); | |
203 | if (ret) { | |
204 | dev_err(&cam->platdev->dev, "Unable to request reset GPIO\n"); | |
205 | gpio_free(cam->power_gpio); | |
206 | return ret; | |
207 | } | |
208 | gpio_direction_output(cam->power_gpio, 0); | |
209 | gpio_direction_output(cam->reset_gpio, 0); | |
210 | return 0; | |
211 | } | |
212 | ||
213 | /* | |
214 | * Power up the sensor and perform the reset dance. | |
215 | */ | |
216 | static void via_sensor_power_up(struct via_camera *cam) | |
217 | { | |
218 | gpio_set_value(cam->power_gpio, 1); | |
219 | gpio_set_value(cam->reset_gpio, 0); | |
220 | msleep(20); /* Probably excessive */ | |
221 | gpio_set_value(cam->reset_gpio, 1); | |
222 | msleep(20); | |
223 | } | |
224 | ||
225 | static void via_sensor_power_down(struct via_camera *cam) | |
226 | { | |
227 | gpio_set_value(cam->power_gpio, 0); | |
228 | gpio_set_value(cam->reset_gpio, 0); | |
229 | } | |
230 | ||
231 | ||
232 | static void via_sensor_power_release(struct via_camera *cam) | |
233 | { | |
234 | via_sensor_power_down(cam); | |
235 | gpio_free(cam->power_gpio); | |
236 | gpio_free(cam->reset_gpio); | |
237 | } | |
238 | ||
239 | /* --------------------------------------------------------------------------*/ | |
240 | /* Sensor ops */ | |
241 | ||
242 | /* | |
243 | * Manage the ov7670 "flip" bit, which needs special help. | |
244 | */ | |
245 | static int viacam_set_flip(struct via_camera *cam) | |
246 | { | |
247 | struct v4l2_control ctrl; | |
248 | ||
249 | memset(&ctrl, 0, sizeof(ctrl)); | |
250 | ctrl.id = V4L2_CID_VFLIP; | |
251 | ctrl.value = flip_image; | |
252 | return sensor_call(cam, core, s_ctrl, &ctrl); | |
253 | } | |
254 | ||
255 | /* | |
256 | * Configure the sensor. It's up to the caller to ensure | |
257 | * that the camera is in the correct operating state. | |
258 | */ | |
259 | static int viacam_configure_sensor(struct via_camera *cam) | |
260 | { | |
261 | struct v4l2_mbus_framefmt mbus_fmt; | |
262 | int ret; | |
263 | ||
264 | v4l2_fill_mbus_format(&mbus_fmt, &cam->sensor_format, cam->mbus_code); | |
265 | ret = sensor_call(cam, core, init, 0); | |
266 | if (ret == 0) | |
267 | ret = sensor_call(cam, video, s_mbus_fmt, &mbus_fmt); | |
268 | /* | |
269 | * OV7670 does weird things if flip is set *before* format... | |
270 | */ | |
271 | if (ret == 0) | |
272 | ret = viacam_set_flip(cam); | |
273 | return ret; | |
274 | } | |
275 | ||
276 | ||
277 | ||
278 | /* --------------------------------------------------------------------------*/ | |
279 | /* | |
280 | * Some simple register accessors; they assume that the lock is held. | |
281 | * | |
282 | * Should we want to support the second capture engine, we could | |
283 | * hide the register difference by adding 0x1000 to registers in the | |
284 | * 0x300-350 range. | |
285 | */ | |
286 | static inline void viacam_write_reg(struct via_camera *cam, | |
287 | int reg, int value) | |
288 | { | |
289 | iowrite32(value, cam->mmio + reg); | |
290 | } | |
291 | ||
292 | static inline int viacam_read_reg(struct via_camera *cam, int reg) | |
293 | { | |
294 | return ioread32(cam->mmio + reg); | |
295 | } | |
296 | ||
297 | static inline void viacam_write_reg_mask(struct via_camera *cam, | |
298 | int reg, int value, int mask) | |
299 | { | |
300 | int tmp = viacam_read_reg(cam, reg); | |
301 | ||
302 | tmp = (tmp & ~mask) | (value & mask); | |
303 | viacam_write_reg(cam, reg, tmp); | |
304 | } | |
305 | ||
306 | ||
307 | /* --------------------------------------------------------------------------*/ | |
308 | /* Interrupt management and handling */ | |
309 | ||
310 | static irqreturn_t viacam_quick_irq(int irq, void *data) | |
311 | { | |
312 | struct via_camera *cam = data; | |
313 | irqreturn_t ret = IRQ_NONE; | |
314 | int icv; | |
315 | ||
316 | /* | |
317 | * All we do here is to clear the interrupts and tell | |
318 | * the handler thread to wake up. | |
319 | */ | |
320 | spin_lock(&cam->viadev->reg_lock); | |
321 | icv = viacam_read_reg(cam, VCR_INTCTRL); | |
322 | if (icv & VCR_IC_EAV) { | |
323 | icv |= VCR_IC_EAV|VCR_IC_EVBI|VCR_IC_FFULL; | |
324 | viacam_write_reg(cam, VCR_INTCTRL, icv); | |
325 | ret = IRQ_WAKE_THREAD; | |
326 | } | |
327 | spin_unlock(&cam->viadev->reg_lock); | |
328 | return ret; | |
329 | } | |
330 | ||
331 | /* | |
332 | * Find the next videobuf buffer which has somebody waiting on it. | |
333 | */ | |
334 | static struct videobuf_buffer *viacam_next_buffer(struct via_camera *cam) | |
335 | { | |
336 | unsigned long flags; | |
337 | struct videobuf_buffer *buf = NULL; | |
338 | ||
339 | spin_lock_irqsave(&cam->viadev->reg_lock, flags); | |
340 | if (cam->opstate != S_RUNNING) | |
341 | goto out; | |
342 | if (list_empty(&cam->buffer_queue)) | |
343 | goto out; | |
344 | buf = list_entry(cam->buffer_queue.next, struct videobuf_buffer, queue); | |
345 | if (!waitqueue_active(&buf->done)) {/* Nobody waiting */ | |
346 | buf = NULL; | |
347 | goto out; | |
348 | } | |
349 | list_del(&buf->queue); | |
350 | buf->state = VIDEOBUF_ACTIVE; | |
351 | out: | |
352 | spin_unlock_irqrestore(&cam->viadev->reg_lock, flags); | |
353 | return buf; | |
354 | } | |
355 | ||
356 | /* | |
357 | * The threaded IRQ handler. | |
358 | */ | |
359 | static irqreturn_t viacam_irq(int irq, void *data) | |
360 | { | |
361 | int bufn; | |
362 | struct videobuf_buffer *vb; | |
363 | struct via_camera *cam = data; | |
364 | struct videobuf_dmabuf *vdma; | |
365 | ||
366 | /* | |
367 | * If there is no place to put the data frame, don't bother | |
368 | * with anything else. | |
369 | */ | |
370 | vb = viacam_next_buffer(cam); | |
371 | if (vb == NULL) | |
372 | goto done; | |
373 | /* | |
374 | * Figure out which buffer we just completed. | |
375 | */ | |
376 | bufn = (viacam_read_reg(cam, VCR_INTCTRL) & VCR_IC_ACTBUF) >> 3; | |
377 | bufn -= 1; | |
378 | if (bufn < 0) | |
379 | bufn = cam->n_cap_bufs - 1; | |
380 | /* | |
381 | * Copy over the data and let any waiters know. | |
382 | */ | |
383 | vdma = videobuf_to_dma(vb); | |
384 | viafb_dma_copy_out_sg(cam->cb_offsets[bufn], vdma->sglist, vdma->sglen); | |
385 | vb->state = VIDEOBUF_DONE; | |
386 | vb->size = cam->user_format.sizeimage; | |
387 | wake_up(&vb->done); | |
388 | done: | |
389 | return IRQ_HANDLED; | |
390 | } | |
391 | ||
392 | ||
393 | /* | |
394 | * These functions must mess around with the general interrupt | |
395 | * control register, which is relevant to much more than just the | |
396 | * camera. Nothing else uses interrupts, though, as of this writing. | |
397 | * Should that situation change, we'll have to improve support at | |
398 | * the via-core level. | |
399 | */ | |
400 | static void viacam_int_enable(struct via_camera *cam) | |
401 | { | |
402 | viacam_write_reg(cam, VCR_INTCTRL, | |
403 | VCR_IC_INTEN|VCR_IC_EAV|VCR_IC_EVBI|VCR_IC_FFULL); | |
404 | viafb_irq_enable(VDE_I_C0AVEN); | |
405 | } | |
406 | ||
407 | static void viacam_int_disable(struct via_camera *cam) | |
408 | { | |
409 | viafb_irq_disable(VDE_I_C0AVEN); | |
410 | viacam_write_reg(cam, VCR_INTCTRL, 0); | |
411 | } | |
412 | ||
413 | ||
414 | ||
415 | /* --------------------------------------------------------------------------*/ | |
416 | /* Controller operations */ | |
417 | ||
418 | /* | |
419 | * Set up our capture buffers in framebuffer memory. | |
420 | */ | |
421 | static int viacam_ctlr_cbufs(struct via_camera *cam) | |
422 | { | |
423 | int nbuf = cam->viadev->camera_fbmem_size/cam->sensor_format.sizeimage; | |
424 | int i; | |
425 | unsigned int offset; | |
426 | ||
427 | /* | |
428 | * See how many buffers we can work with. | |
429 | */ | |
430 | if (nbuf >= 3) { | |
431 | cam->n_cap_bufs = 3; | |
432 | viacam_write_reg_mask(cam, VCR_CAPINTC, VCR_CI_3BUFS, | |
433 | VCR_CI_3BUFS); | |
434 | } else if (nbuf == 2) { | |
435 | cam->n_cap_bufs = 2; | |
436 | viacam_write_reg_mask(cam, VCR_CAPINTC, 0, VCR_CI_3BUFS); | |
437 | } else { | |
438 | cam_warn(cam, "Insufficient frame buffer memory\n"); | |
439 | return -ENOMEM; | |
440 | } | |
441 | /* | |
442 | * Set them up. | |
443 | */ | |
444 | offset = cam->fb_offset; | |
445 | for (i = 0; i < cam->n_cap_bufs; i++) { | |
446 | cam->cb_offsets[i] = offset; | |
447 | cam->cb_addrs[i] = cam->fbmem + offset; | |
448 | viacam_write_reg(cam, VCR_VBUF1 + i*4, offset & VCR_VBUF_MASK); | |
449 | offset += cam->sensor_format.sizeimage; | |
450 | } | |
451 | return 0; | |
452 | } | |
453 | ||
454 | /* | |
455 | * Set the scaling register for downscaling the image. | |
456 | * | |
457 | * This register works like this... Vertical scaling is enabled | |
458 | * by bit 26; if that bit is set, downscaling is controlled by the | |
459 | * value in bits 16:25. Those bits are divided by 1024 to get | |
460 | * the scaling factor; setting just bit 25 thus cuts the height | |
461 | * in half. | |
462 | * | |
463 | * Horizontal scaling works about the same, but it's enabled by | |
464 | * bit 11, with bits 0:10 giving the numerator of a fraction | |
465 | * (over 2048) for the scaling value. | |
466 | * | |
467 | * This function is naive in that, if the user departs from | |
468 | * the 3x4 VGA scaling factor, the image will distort. We | |
469 | * could work around that if it really seemed important. | |
470 | */ | |
471 | static void viacam_set_scale(struct via_camera *cam) | |
472 | { | |
473 | unsigned int avscale; | |
474 | int sf; | |
475 | ||
476 | if (cam->user_format.width == VGA_WIDTH) | |
477 | avscale = 0; | |
478 | else { | |
479 | sf = (cam->user_format.width*2048)/VGA_WIDTH; | |
480 | avscale = VCR_AVS_HEN | sf; | |
481 | } | |
482 | if (cam->user_format.height < VGA_HEIGHT) { | |
483 | sf = (1024*cam->user_format.height)/VGA_HEIGHT; | |
484 | avscale |= VCR_AVS_VEN | (sf << 16); | |
485 | } | |
486 | viacam_write_reg(cam, VCR_AVSCALE, avscale); | |
487 | } | |
488 | ||
489 | ||
490 | /* | |
491 | * Configure image-related information into the capture engine. | |
492 | */ | |
493 | static void viacam_ctlr_image(struct via_camera *cam) | |
494 | { | |
495 | int cicreg; | |
496 | ||
497 | /* | |
498 | * Disable clock before messing with stuff - from the via | |
499 | * sample driver. | |
500 | */ | |
501 | viacam_write_reg(cam, VCR_CAPINTC, ~(VCR_CI_ENABLE|VCR_CI_CLKEN)); | |
502 | /* | |
503 | * Set up the controller for VGA resolution, modulo magic | |
504 | * offsets from the via sample driver. | |
505 | */ | |
506 | viacam_write_reg(cam, VCR_HORRANGE, 0x06200120); | |
507 | viacam_write_reg(cam, VCR_VERTRANGE, 0x01de0000); | |
508 | viacam_set_scale(cam); | |
509 | /* | |
510 | * Image size info. | |
511 | */ | |
512 | viacam_write_reg(cam, VCR_MAXDATA, | |
513 | (cam->sensor_format.height << 16) | | |
514 | (cam->sensor_format.bytesperline >> 3)); | |
515 | viacam_write_reg(cam, VCR_MAXVBI, 0); | |
516 | viacam_write_reg(cam, VCR_VSTRIDE, | |
517 | cam->user_format.bytesperline & VCR_VS_STRIDE); | |
518 | /* | |
519 | * Set up the capture interface control register, | |
520 | * everything but the "go" bit. | |
521 | * | |
522 | * The FIFO threshold is a bit of a magic number; 8 is what | |
523 | * VIA's sample code uses. | |
524 | */ | |
525 | cicreg = VCR_CI_CLKEN | | |
526 | 0x08000000 | /* FIFO threshold */ | |
527 | VCR_CI_FLDINV | /* OLPC-specific? */ | |
528 | VCR_CI_VREFINV | /* OLPC-specific? */ | |
529 | VCR_CI_DIBOTH | /* Capture both fields */ | |
530 | VCR_CI_CCIR601_8; | |
531 | if (cam->n_cap_bufs == 3) | |
532 | cicreg |= VCR_CI_3BUFS; | |
533 | /* | |
534 | * YUV formats need different byte swapping than RGB. | |
535 | */ | |
536 | if (cam->user_format.pixelformat == V4L2_PIX_FMT_YUYV) | |
537 | cicreg |= VCR_CI_YUYV; | |
538 | else | |
539 | cicreg |= VCR_CI_UYVY; | |
540 | viacam_write_reg(cam, VCR_CAPINTC, cicreg); | |
541 | } | |
542 | ||
543 | ||
544 | static int viacam_config_controller(struct via_camera *cam) | |
545 | { | |
546 | int ret; | |
547 | unsigned long flags; | |
548 | ||
549 | spin_lock_irqsave(&cam->viadev->reg_lock, flags); | |
550 | ret = viacam_ctlr_cbufs(cam); | |
551 | if (!ret) | |
552 | viacam_ctlr_image(cam); | |
553 | spin_unlock_irqrestore(&cam->viadev->reg_lock, flags); | |
554 | clear_bit(CF_CONFIG_NEEDED, &cam->flags); | |
555 | return ret; | |
556 | } | |
557 | ||
558 | /* | |
559 | * Make it start grabbing data. | |
560 | */ | |
561 | static void viacam_start_engine(struct via_camera *cam) | |
562 | { | |
563 | spin_lock_irq(&cam->viadev->reg_lock); | |
564 | cam->next_buf = 0; | |
565 | viacam_write_reg_mask(cam, VCR_CAPINTC, VCR_CI_ENABLE, VCR_CI_ENABLE); | |
566 | viacam_int_enable(cam); | |
567 | (void) viacam_read_reg(cam, VCR_CAPINTC); /* Force post */ | |
568 | cam->opstate = S_RUNNING; | |
569 | spin_unlock_irq(&cam->viadev->reg_lock); | |
570 | } | |
571 | ||
572 | ||
573 | static void viacam_stop_engine(struct via_camera *cam) | |
574 | { | |
575 | spin_lock_irq(&cam->viadev->reg_lock); | |
576 | viacam_int_disable(cam); | |
577 | viacam_write_reg_mask(cam, VCR_CAPINTC, 0, VCR_CI_ENABLE); | |
578 | (void) viacam_read_reg(cam, VCR_CAPINTC); /* Force post */ | |
579 | cam->opstate = S_IDLE; | |
580 | spin_unlock_irq(&cam->viadev->reg_lock); | |
581 | } | |
582 | ||
583 | ||
584 | /* --------------------------------------------------------------------------*/ | |
585 | /* Videobuf callback ops */ | |
586 | ||
587 | /* | |
588 | * buffer_setup. The purpose of this one would appear to be to tell | |
589 | * videobuf how big a single image is. It's also evidently up to us | |
590 | * to put some sort of limit on the maximum number of buffers allowed. | |
591 | */ | |
592 | static int viacam_vb_buf_setup(struct videobuf_queue *q, | |
593 | unsigned int *count, unsigned int *size) | |
594 | { | |
595 | struct via_camera *cam = q->priv_data; | |
596 | ||
597 | *size = cam->user_format.sizeimage; | |
598 | if (*count == 0 || *count > 6) /* Arbitrary number */ | |
599 | *count = 6; | |
600 | return 0; | |
601 | } | |
602 | ||
603 | /* | |
604 | * Prepare a buffer. | |
605 | */ | |
606 | static int viacam_vb_buf_prepare(struct videobuf_queue *q, | |
607 | struct videobuf_buffer *vb, enum v4l2_field field) | |
608 | { | |
609 | struct via_camera *cam = q->priv_data; | |
610 | ||
611 | vb->size = cam->user_format.sizeimage; | |
612 | vb->width = cam->user_format.width; /* bytesperline???? */ | |
613 | vb->height = cam->user_format.height; | |
614 | vb->field = field; | |
615 | if (vb->state == VIDEOBUF_NEEDS_INIT) { | |
616 | int ret = videobuf_iolock(q, vb, NULL); | |
617 | if (ret) | |
618 | return ret; | |
619 | } | |
620 | vb->state = VIDEOBUF_PREPARED; | |
621 | return 0; | |
622 | } | |
623 | ||
624 | /* | |
625 | * We've got a buffer to put data into. | |
626 | * | |
627 | * FIXME: check for a running engine and valid buffers? | |
628 | */ | |
629 | static void viacam_vb_buf_queue(struct videobuf_queue *q, | |
630 | struct videobuf_buffer *vb) | |
631 | { | |
632 | struct via_camera *cam = q->priv_data; | |
633 | ||
634 | /* | |
635 | * Note that videobuf holds the lock when it calls | |
636 | * us, so we need not (indeed, cannot) take it here. | |
637 | */ | |
638 | vb->state = VIDEOBUF_QUEUED; | |
639 | list_add_tail(&vb->queue, &cam->buffer_queue); | |
640 | } | |
641 | ||
642 | /* | |
643 | * Free a buffer. | |
644 | */ | |
645 | static void viacam_vb_buf_release(struct videobuf_queue *q, | |
646 | struct videobuf_buffer *vb) | |
647 | { | |
648 | struct via_camera *cam = q->priv_data; | |
649 | ||
650 | videobuf_dma_unmap(&cam->platdev->dev, videobuf_to_dma(vb)); | |
651 | videobuf_dma_free(videobuf_to_dma(vb)); | |
652 | vb->state = VIDEOBUF_NEEDS_INIT; | |
653 | } | |
654 | ||
655 | static const struct videobuf_queue_ops viacam_vb_ops = { | |
656 | .buf_setup = viacam_vb_buf_setup, | |
657 | .buf_prepare = viacam_vb_buf_prepare, | |
658 | .buf_queue = viacam_vb_buf_queue, | |
659 | .buf_release = viacam_vb_buf_release, | |
660 | }; | |
661 | ||
662 | /* --------------------------------------------------------------------------*/ | |
663 | /* File operations */ | |
664 | ||
665 | static int viacam_open(struct file *filp) | |
666 | { | |
667 | struct via_camera *cam = video_drvdata(filp); | |
668 | ||
669 | filp->private_data = cam; | |
670 | /* | |
671 | * Note the new user. If this is the first one, we'll also | |
672 | * need to power up the sensor. | |
673 | */ | |
674 | mutex_lock(&cam->lock); | |
675 | if (cam->users == 0) { | |
676 | int ret = viafb_request_dma(); | |
677 | ||
678 | if (ret) { | |
679 | mutex_unlock(&cam->lock); | |
680 | return ret; | |
681 | } | |
682 | via_sensor_power_up(cam); | |
683 | set_bit(CF_CONFIG_NEEDED, &cam->flags); | |
684 | /* | |
685 | * Hook into videobuf. Evidently this cannot fail. | |
686 | */ | |
687 | videobuf_queue_sg_init(&cam->vb_queue, &viacam_vb_ops, | |
688 | &cam->platdev->dev, &cam->viadev->reg_lock, | |
689 | V4L2_BUF_TYPE_VIDEO_CAPTURE, V4L2_FIELD_NONE, | |
690 | sizeof(struct videobuf_buffer), cam, NULL); | |
691 | } | |
692 | (cam->users)++; | |
693 | mutex_unlock(&cam->lock); | |
694 | return 0; | |
695 | } | |
696 | ||
697 | static int viacam_release(struct file *filp) | |
698 | { | |
699 | struct via_camera *cam = video_drvdata(filp); | |
700 | ||
701 | mutex_lock(&cam->lock); | |
702 | (cam->users)--; | |
703 | /* | |
704 | * If the "owner" is closing, shut down any ongoing | |
705 | * operations. | |
706 | */ | |
707 | if (filp == cam->owner) { | |
708 | videobuf_stop(&cam->vb_queue); | |
709 | /* | |
710 | * We don't hold the spinlock here, but, if release() | |
711 | * is being called by the owner, nobody else will | |
712 | * be changing the state. And an extra stop would | |
713 | * not hurt anyway. | |
714 | */ | |
715 | if (cam->opstate != S_IDLE) | |
716 | viacam_stop_engine(cam); | |
717 | cam->owner = NULL; | |
718 | } | |
719 | /* | |
720 | * Last one out needs to turn out the lights. | |
721 | */ | |
722 | if (cam->users == 0) { | |
723 | videobuf_mmap_free(&cam->vb_queue); | |
724 | via_sensor_power_down(cam); | |
725 | viafb_release_dma(); | |
726 | } | |
727 | mutex_unlock(&cam->lock); | |
728 | return 0; | |
729 | } | |
730 | ||
731 | /* | |
732 | * Read a frame from the device. | |
733 | */ | |
734 | static ssize_t viacam_read(struct file *filp, char __user *buffer, | |
735 | size_t len, loff_t *pos) | |
736 | { | |
737 | struct via_camera *cam = video_drvdata(filp); | |
738 | int ret; | |
739 | ||
740 | mutex_lock(&cam->lock); | |
741 | /* | |
742 | * Enforce the V4l2 "only one owner gets to read data" rule. | |
743 | */ | |
744 | if (cam->owner && cam->owner != filp) { | |
745 | ret = -EBUSY; | |
746 | goto out_unlock; | |
747 | } | |
748 | cam->owner = filp; | |
749 | /* | |
750 | * Do we need to configure the hardware? | |
751 | */ | |
752 | if (test_bit(CF_CONFIG_NEEDED, &cam->flags)) { | |
753 | ret = viacam_configure_sensor(cam); | |
754 | if (!ret) | |
755 | ret = viacam_config_controller(cam); | |
756 | if (ret) | |
757 | goto out_unlock; | |
758 | } | |
759 | /* | |
760 | * Fire up the capture engine, then have videobuf do | |
761 | * the heavy lifting. Someday it would be good to avoid | |
762 | * stopping and restarting the engine each time. | |
763 | */ | |
764 | INIT_LIST_HEAD(&cam->buffer_queue); | |
765 | viacam_start_engine(cam); | |
766 | ret = videobuf_read_stream(&cam->vb_queue, buffer, len, pos, 0, | |
767 | filp->f_flags & O_NONBLOCK); | |
768 | viacam_stop_engine(cam); | |
769 | /* videobuf_stop() ?? */ | |
770 | ||
771 | out_unlock: | |
772 | mutex_unlock(&cam->lock); | |
773 | return ret; | |
774 | } | |
775 | ||
776 | ||
777 | static unsigned int viacam_poll(struct file *filp, struct poll_table_struct *pt) | |
778 | { | |
779 | struct via_camera *cam = video_drvdata(filp); | |
780 | ||
781 | return videobuf_poll_stream(filp, &cam->vb_queue, pt); | |
782 | } | |
783 | ||
784 | ||
785 | static int viacam_mmap(struct file *filp, struct vm_area_struct *vma) | |
786 | { | |
787 | struct via_camera *cam = video_drvdata(filp); | |
788 | ||
789 | return videobuf_mmap_mapper(&cam->vb_queue, vma); | |
790 | } | |
791 | ||
792 | ||
793 | ||
794 | static const struct v4l2_file_operations viacam_fops = { | |
795 | .owner = THIS_MODULE, | |
796 | .open = viacam_open, | |
797 | .release = viacam_release, | |
798 | .read = viacam_read, | |
799 | .poll = viacam_poll, | |
800 | .mmap = viacam_mmap, | |
801 | .unlocked_ioctl = video_ioctl2, | |
802 | }; | |
803 | ||
804 | /*----------------------------------------------------------------------------*/ | |
805 | /* | |
806 | * The long list of v4l2 ioctl ops | |
807 | */ | |
808 | ||
809 | static int viacam_g_chip_ident(struct file *file, void *priv, | |
810 | struct v4l2_dbg_chip_ident *ident) | |
811 | { | |
812 | struct via_camera *cam = priv; | |
813 | ||
814 | ident->ident = V4L2_IDENT_NONE; | |
815 | ident->revision = 0; | |
816 | if (v4l2_chip_match_host(&ident->match)) { | |
817 | ident->ident = V4L2_IDENT_VIA_VX855; | |
818 | return 0; | |
819 | } | |
820 | return sensor_call(cam, core, g_chip_ident, ident); | |
821 | } | |
822 | ||
823 | /* | |
824 | * Control ops are passed through to the sensor. | |
825 | */ | |
826 | static int viacam_queryctrl(struct file *filp, void *priv, | |
827 | struct v4l2_queryctrl *qc) | |
828 | { | |
829 | struct via_camera *cam = priv; | |
830 | int ret; | |
831 | ||
832 | mutex_lock(&cam->lock); | |
833 | ret = sensor_call(cam, core, queryctrl, qc); | |
834 | mutex_unlock(&cam->lock); | |
835 | return ret; | |
836 | } | |
837 | ||
838 | ||
839 | static int viacam_g_ctrl(struct file *filp, void *priv, | |
840 | struct v4l2_control *ctrl) | |
841 | { | |
842 | struct via_camera *cam = priv; | |
843 | int ret; | |
844 | ||
845 | mutex_lock(&cam->lock); | |
846 | ret = sensor_call(cam, core, g_ctrl, ctrl); | |
847 | mutex_unlock(&cam->lock); | |
848 | return ret; | |
849 | } | |
850 | ||
851 | ||
852 | static int viacam_s_ctrl(struct file *filp, void *priv, | |
853 | struct v4l2_control *ctrl) | |
854 | { | |
855 | struct via_camera *cam = priv; | |
856 | int ret; | |
857 | ||
858 | mutex_lock(&cam->lock); | |
859 | ret = sensor_call(cam, core, s_ctrl, ctrl); | |
860 | mutex_unlock(&cam->lock); | |
861 | return ret; | |
862 | } | |
863 | ||
864 | /* | |
865 | * Only one input. | |
866 | */ | |
867 | static int viacam_enum_input(struct file *filp, void *priv, | |
868 | struct v4l2_input *input) | |
869 | { | |
870 | if (input->index != 0) | |
871 | return -EINVAL; | |
872 | ||
873 | input->type = V4L2_INPUT_TYPE_CAMERA; | |
874 | input->std = V4L2_STD_ALL; /* Not sure what should go here */ | |
875 | strcpy(input->name, "Camera"); | |
876 | return 0; | |
877 | } | |
878 | ||
879 | static int viacam_g_input(struct file *filp, void *priv, unsigned int *i) | |
880 | { | |
881 | *i = 0; | |
882 | return 0; | |
883 | } | |
884 | ||
885 | static int viacam_s_input(struct file *filp, void *priv, unsigned int i) | |
886 | { | |
887 | if (i != 0) | |
888 | return -EINVAL; | |
889 | return 0; | |
890 | } | |
891 | ||
892 | static int viacam_s_std(struct file *filp, void *priv, v4l2_std_id *std) | |
893 | { | |
894 | return 0; | |
895 | } | |
896 | ||
897 | /* | |
898 | * Video format stuff. Here is our default format until | |
899 | * user space messes with things. | |
900 | */ | |
901 | static const struct v4l2_pix_format viacam_def_pix_format = { | |
902 | .width = VGA_WIDTH, | |
903 | .height = VGA_HEIGHT, | |
904 | .pixelformat = V4L2_PIX_FMT_YUYV, | |
905 | .field = V4L2_FIELD_NONE, | |
906 | .bytesperline = VGA_WIDTH * 2, | |
907 | .sizeimage = VGA_WIDTH * VGA_HEIGHT * 2, | |
908 | }; | |
909 | ||
910 | static const enum v4l2_mbus_pixelcode via_def_mbus_code = V4L2_MBUS_FMT_YUYV8_2X8; | |
911 | ||
912 | static int viacam_enum_fmt_vid_cap(struct file *filp, void *priv, | |
913 | struct v4l2_fmtdesc *fmt) | |
914 | { | |
915 | if (fmt->index >= N_VIA_FMTS) | |
916 | return -EINVAL; | |
917 | strlcpy(fmt->description, via_formats[fmt->index].desc, | |
918 | sizeof(fmt->description)); | |
919 | fmt->pixelformat = via_formats[fmt->index].pixelformat; | |
920 | return 0; | |
921 | } | |
922 | ||
923 | /* | |
924 | * Figure out proper image dimensions, but always force the | |
925 | * sensor to VGA. | |
926 | */ | |
927 | static void viacam_fmt_pre(struct v4l2_pix_format *userfmt, | |
928 | struct v4l2_pix_format *sensorfmt) | |
929 | { | |
930 | *sensorfmt = *userfmt; | |
931 | if (userfmt->width < QCIF_WIDTH || userfmt->height < QCIF_HEIGHT) { | |
932 | userfmt->width = QCIF_WIDTH; | |
933 | userfmt->height = QCIF_HEIGHT; | |
934 | } | |
935 | if (userfmt->width > VGA_WIDTH || userfmt->height > VGA_HEIGHT) { | |
936 | userfmt->width = VGA_WIDTH; | |
937 | userfmt->height = VGA_HEIGHT; | |
938 | } | |
939 | sensorfmt->width = VGA_WIDTH; | |
940 | sensorfmt->height = VGA_HEIGHT; | |
941 | } | |
942 | ||
943 | static void viacam_fmt_post(struct v4l2_pix_format *userfmt, | |
944 | struct v4l2_pix_format *sensorfmt) | |
945 | { | |
946 | struct via_format *f = via_find_format(userfmt->pixelformat); | |
947 | ||
948 | sensorfmt->bytesperline = sensorfmt->width * f->bpp; | |
949 | sensorfmt->sizeimage = sensorfmt->height * sensorfmt->bytesperline; | |
950 | userfmt->pixelformat = sensorfmt->pixelformat; | |
951 | userfmt->field = sensorfmt->field; | |
952 | userfmt->bytesperline = 2 * userfmt->width; | |
953 | userfmt->sizeimage = userfmt->bytesperline * userfmt->height; | |
954 | } | |
955 | ||
956 | ||
957 | /* | |
958 | * The real work of figuring out a workable format. | |
959 | */ | |
960 | static int viacam_do_try_fmt(struct via_camera *cam, | |
961 | struct v4l2_pix_format *upix, struct v4l2_pix_format *spix) | |
962 | { | |
963 | int ret; | |
964 | struct v4l2_mbus_framefmt mbus_fmt; | |
965 | struct via_format *f = via_find_format(upix->pixelformat); | |
966 | ||
967 | upix->pixelformat = f->pixelformat; | |
968 | viacam_fmt_pre(upix, spix); | |
969 | v4l2_fill_mbus_format(&mbus_fmt, upix, f->mbus_code); | |
970 | ret = sensor_call(cam, video, try_mbus_fmt, &mbus_fmt); | |
971 | v4l2_fill_pix_format(spix, &mbus_fmt); | |
972 | viacam_fmt_post(upix, spix); | |
973 | return ret; | |
974 | } | |
975 | ||
976 | ||
977 | ||
978 | static int viacam_try_fmt_vid_cap(struct file *filp, void *priv, | |
979 | struct v4l2_format *fmt) | |
980 | { | |
981 | struct via_camera *cam = priv; | |
982 | struct v4l2_format sfmt; | |
983 | int ret; | |
984 | ||
985 | mutex_lock(&cam->lock); | |
986 | ret = viacam_do_try_fmt(cam, &fmt->fmt.pix, &sfmt.fmt.pix); | |
987 | mutex_unlock(&cam->lock); | |
988 | return ret; | |
989 | } | |
990 | ||
991 | ||
992 | static int viacam_g_fmt_vid_cap(struct file *filp, void *priv, | |
993 | struct v4l2_format *fmt) | |
994 | { | |
995 | struct via_camera *cam = priv; | |
996 | ||
997 | mutex_lock(&cam->lock); | |
998 | fmt->fmt.pix = cam->user_format; | |
999 | mutex_unlock(&cam->lock); | |
1000 | return 0; | |
1001 | } | |
1002 | ||
1003 | static int viacam_s_fmt_vid_cap(struct file *filp, void *priv, | |
1004 | struct v4l2_format *fmt) | |
1005 | { | |
1006 | struct via_camera *cam = priv; | |
1007 | int ret; | |
1008 | struct v4l2_format sfmt; | |
1009 | struct via_format *f = via_find_format(fmt->fmt.pix.pixelformat); | |
1010 | ||
1011 | /* | |
1012 | * Camera must be idle or we can't mess with the | |
1013 | * video setup. | |
1014 | */ | |
1015 | mutex_lock(&cam->lock); | |
1016 | if (cam->opstate != S_IDLE) { | |
1017 | ret = -EBUSY; | |
1018 | goto out; | |
1019 | } | |
1020 | /* | |
1021 | * Let the sensor code look over and tweak the | |
1022 | * requested formatting. | |
1023 | */ | |
1024 | ret = viacam_do_try_fmt(cam, &fmt->fmt.pix, &sfmt.fmt.pix); | |
1025 | if (ret) | |
1026 | goto out; | |
1027 | /* | |
1028 | * OK, let's commit to the new format. | |
1029 | */ | |
1030 | cam->user_format = fmt->fmt.pix; | |
1031 | cam->sensor_format = sfmt.fmt.pix; | |
1032 | cam->mbus_code = f->mbus_code; | |
1033 | ret = viacam_configure_sensor(cam); | |
1034 | if (!ret) | |
1035 | ret = viacam_config_controller(cam); | |
1036 | out: | |
1037 | mutex_unlock(&cam->lock); | |
1038 | return ret; | |
1039 | } | |
1040 | ||
1041 | static int viacam_querycap(struct file *filp, void *priv, | |
1042 | struct v4l2_capability *cap) | |
1043 | { | |
1044 | strcpy(cap->driver, "via-camera"); | |
1045 | strcpy(cap->card, "via-camera"); | |
1046 | cap->version = 1; | |
1047 | cap->capabilities = V4L2_CAP_VIDEO_CAPTURE | | |
1048 | V4L2_CAP_READWRITE | V4L2_CAP_STREAMING; | |
1049 | return 0; | |
1050 | } | |
1051 | ||
1052 | /* | |
1053 | * Streaming operations - pure videobuf stuff. | |
1054 | */ | |
1055 | static int viacam_reqbufs(struct file *filp, void *priv, | |
1056 | struct v4l2_requestbuffers *rb) | |
1057 | { | |
1058 | struct via_camera *cam = priv; | |
1059 | ||
1060 | return videobuf_reqbufs(&cam->vb_queue, rb); | |
1061 | } | |
1062 | ||
1063 | static int viacam_querybuf(struct file *filp, void *priv, | |
1064 | struct v4l2_buffer *buf) | |
1065 | { | |
1066 | struct via_camera *cam = priv; | |
1067 | ||
1068 | return videobuf_querybuf(&cam->vb_queue, buf); | |
1069 | } | |
1070 | ||
1071 | static int viacam_qbuf(struct file *filp, void *priv, struct v4l2_buffer *buf) | |
1072 | { | |
1073 | struct via_camera *cam = priv; | |
1074 | ||
1075 | return videobuf_qbuf(&cam->vb_queue, buf); | |
1076 | } | |
1077 | ||
1078 | static int viacam_dqbuf(struct file *filp, void *priv, struct v4l2_buffer *buf) | |
1079 | { | |
1080 | struct via_camera *cam = priv; | |
1081 | ||
1082 | return videobuf_dqbuf(&cam->vb_queue, buf, filp->f_flags & O_NONBLOCK); | |
1083 | } | |
1084 | ||
1085 | static int viacam_streamon(struct file *filp, void *priv, enum v4l2_buf_type t) | |
1086 | { | |
1087 | struct via_camera *cam = priv; | |
1088 | int ret = 0; | |
1089 | ||
1090 | if (t != V4L2_BUF_TYPE_VIDEO_CAPTURE) | |
1091 | return -EINVAL; | |
1092 | ||
1093 | mutex_lock(&cam->lock); | |
1094 | if (cam->opstate != S_IDLE) { | |
1095 | ret = -EBUSY; | |
1096 | goto out; | |
1097 | } | |
1098 | /* | |
1099 | * Enforce the V4l2 "only one owner gets to read data" rule. | |
1100 | */ | |
1101 | if (cam->owner && cam->owner != filp) { | |
1102 | ret = -EBUSY; | |
1103 | goto out; | |
1104 | } | |
1105 | cam->owner = filp; | |
1106 | /* | |
1107 | * Configure things if need be. | |
1108 | */ | |
1109 | if (test_bit(CF_CONFIG_NEEDED, &cam->flags)) { | |
1110 | ret = viacam_configure_sensor(cam); | |
1111 | if (ret) | |
1112 | goto out; | |
1113 | ret = viacam_config_controller(cam); | |
1114 | if (ret) | |
1115 | goto out; | |
1116 | } | |
1117 | /* | |
1118 | * If the CPU goes into C3, the DMA transfer gets corrupted and | |
1119 | * users start filing unsightly bug reports. Put in a "latency" | |
1120 | * requirement which will keep the CPU out of the deeper sleep | |
1121 | * states. | |
1122 | */ | |
1123 | pm_qos_add_request(&cam->qos_request, PM_QOS_CPU_DMA_LATENCY, 50); | |
1124 | /* | |
1125 | * Fire things up. | |
1126 | */ | |
1127 | INIT_LIST_HEAD(&cam->buffer_queue); | |
1128 | ret = videobuf_streamon(&cam->vb_queue); | |
1129 | if (!ret) | |
1130 | viacam_start_engine(cam); | |
1131 | out: | |
1132 | mutex_unlock(&cam->lock); | |
1133 | return ret; | |
1134 | } | |
1135 | ||
1136 | static int viacam_streamoff(struct file *filp, void *priv, enum v4l2_buf_type t) | |
1137 | { | |
1138 | struct via_camera *cam = priv; | |
1139 | int ret; | |
1140 | ||
1141 | if (t != V4L2_BUF_TYPE_VIDEO_CAPTURE) | |
1142 | return -EINVAL; | |
1143 | mutex_lock(&cam->lock); | |
1144 | if (cam->opstate != S_RUNNING) { | |
1145 | ret = -EINVAL; | |
1146 | goto out; | |
1147 | } | |
1148 | pm_qos_remove_request(&cam->qos_request); | |
1149 | viacam_stop_engine(cam); | |
1150 | /* | |
1151 | * Videobuf will recycle all of the outstanding buffers, but | |
1152 | * we should be sure we don't retain any references to | |
1153 | * any of them. | |
1154 | */ | |
1155 | ret = videobuf_streamoff(&cam->vb_queue); | |
1156 | INIT_LIST_HEAD(&cam->buffer_queue); | |
1157 | out: | |
1158 | mutex_unlock(&cam->lock); | |
1159 | return ret; | |
1160 | } | |
1161 | ||
024fafba JC |
1162 | /* G/S_PARM */ |
1163 | ||
1164 | static int viacam_g_parm(struct file *filp, void *priv, | |
1165 | struct v4l2_streamparm *parm) | |
1166 | { | |
1167 | struct via_camera *cam = priv; | |
1168 | int ret; | |
1169 | ||
1170 | mutex_lock(&cam->lock); | |
1171 | ret = sensor_call(cam, video, g_parm, parm); | |
1172 | mutex_unlock(&cam->lock); | |
1173 | parm->parm.capture.readbuffers = cam->n_cap_bufs; | |
1174 | return ret; | |
1175 | } | |
1176 | ||
1177 | static int viacam_s_parm(struct file *filp, void *priv, | |
1178 | struct v4l2_streamparm *parm) | |
1179 | { | |
1180 | struct via_camera *cam = priv; | |
1181 | int ret; | |
1182 | ||
1183 | mutex_lock(&cam->lock); | |
1184 | ret = sensor_call(cam, video, s_parm, parm); | |
1185 | mutex_unlock(&cam->lock); | |
1186 | parm->parm.capture.readbuffers = cam->n_cap_bufs; | |
1187 | return ret; | |
1188 | } | |
1189 | ||
1190 | static int viacam_enum_framesizes(struct file *filp, void *priv, | |
1191 | struct v4l2_frmsizeenum *sizes) | |
1192 | { | |
1193 | if (sizes->index != 0) | |
1194 | return -EINVAL; | |
1195 | sizes->type = V4L2_FRMSIZE_TYPE_CONTINUOUS; | |
1196 | sizes->stepwise.min_width = QCIF_WIDTH; | |
1197 | sizes->stepwise.min_height = QCIF_HEIGHT; | |
1198 | sizes->stepwise.max_width = VGA_WIDTH; | |
1199 | sizes->stepwise.max_height = VGA_HEIGHT; | |
1200 | sizes->stepwise.step_width = sizes->stepwise.step_height = 1; | |
1201 | return 0; | |
1202 | } | |
1203 | ||
1204 | static int viacam_enum_frameintervals(struct file *filp, void *priv, | |
1205 | struct v4l2_frmivalenum *interval) | |
1206 | { | |
1207 | struct via_camera *cam = priv; | |
1208 | int ret; | |
1209 | ||
1210 | mutex_lock(&cam->lock); | |
1211 | ret = sensor_call(cam, video, enum_frameintervals, interval); | |
1212 | mutex_unlock(&cam->lock); | |
1213 | return ret; | |
1214 | } | |
1215 | ||
1216 | ||
1217 | ||
1218 | static const struct v4l2_ioctl_ops viacam_ioctl_ops = { | |
1219 | .vidioc_g_chip_ident = viacam_g_chip_ident, | |
1220 | .vidioc_queryctrl = viacam_queryctrl, | |
1221 | .vidioc_g_ctrl = viacam_g_ctrl, | |
1222 | .vidioc_s_ctrl = viacam_s_ctrl, | |
1223 | .vidioc_enum_input = viacam_enum_input, | |
1224 | .vidioc_g_input = viacam_g_input, | |
1225 | .vidioc_s_input = viacam_s_input, | |
1226 | .vidioc_s_std = viacam_s_std, | |
1227 | .vidioc_enum_fmt_vid_cap = viacam_enum_fmt_vid_cap, | |
1228 | .vidioc_try_fmt_vid_cap = viacam_try_fmt_vid_cap, | |
1229 | .vidioc_g_fmt_vid_cap = viacam_g_fmt_vid_cap, | |
1230 | .vidioc_s_fmt_vid_cap = viacam_s_fmt_vid_cap, | |
1231 | .vidioc_querycap = viacam_querycap, | |
1232 | .vidioc_reqbufs = viacam_reqbufs, | |
1233 | .vidioc_querybuf = viacam_querybuf, | |
1234 | .vidioc_qbuf = viacam_qbuf, | |
1235 | .vidioc_dqbuf = viacam_dqbuf, | |
1236 | .vidioc_streamon = viacam_streamon, | |
1237 | .vidioc_streamoff = viacam_streamoff, | |
1238 | .vidioc_g_parm = viacam_g_parm, | |
1239 | .vidioc_s_parm = viacam_s_parm, | |
1240 | .vidioc_enum_framesizes = viacam_enum_framesizes, | |
1241 | .vidioc_enum_frameintervals = viacam_enum_frameintervals, | |
024fafba JC |
1242 | }; |
1243 | ||
1244 | /*----------------------------------------------------------------------------*/ | |
1245 | ||
1246 | /* | |
1247 | * Power management. | |
1248 | */ | |
0522921c DD |
1249 | #ifdef CONFIG_PM |
1250 | ||
1251 | static int viacam_suspend(void *priv) | |
1252 | { | |
1253 | struct via_camera *cam = priv; | |
1254 | enum viacam_opstate state = cam->opstate; | |
1255 | ||
1256 | if (cam->opstate != S_IDLE) { | |
1257 | viacam_stop_engine(cam); | |
1258 | cam->opstate = state; /* So resume restarts */ | |
1259 | } | |
1260 | ||
1261 | return 0; | |
1262 | } | |
1263 | ||
1264 | static int viacam_resume(void *priv) | |
1265 | { | |
1266 | struct via_camera *cam = priv; | |
1267 | int ret = 0; | |
1268 | ||
1269 | /* | |
1270 | * Get back to a reasonable operating state. | |
1271 | */ | |
1272 | via_write_reg_mask(VIASR, 0x78, 0, 0x80); | |
1273 | via_write_reg_mask(VIASR, 0x1e, 0xc0, 0xc0); | |
1274 | viacam_int_disable(cam); | |
1275 | set_bit(CF_CONFIG_NEEDED, &cam->flags); | |
1276 | /* | |
1277 | * Make sure the sensor's power state is correct | |
1278 | */ | |
1279 | if (cam->users > 0) | |
1280 | via_sensor_power_up(cam); | |
1281 | else | |
1282 | via_sensor_power_down(cam); | |
1283 | /* | |
1284 | * If it was operating, try to restart it. | |
1285 | */ | |
1286 | if (cam->opstate != S_IDLE) { | |
1287 | mutex_lock(&cam->lock); | |
1288 | ret = viacam_configure_sensor(cam); | |
1289 | if (!ret) | |
1290 | ret = viacam_config_controller(cam); | |
1291 | mutex_unlock(&cam->lock); | |
1292 | if (!ret) | |
1293 | viacam_start_engine(cam); | |
1294 | } | |
1295 | ||
1296 | return ret; | |
1297 | } | |
1298 | ||
1299 | static struct viafb_pm_hooks viacam_pm_hooks = { | |
1300 | .suspend = viacam_suspend, | |
1301 | .resume = viacam_resume | |
1302 | }; | |
1303 | ||
1304 | #endif /* CONFIG_PM */ | |
024fafba JC |
1305 | |
1306 | /* | |
1307 | * Setup stuff. | |
1308 | */ | |
1309 | ||
1310 | static struct video_device viacam_v4l_template = { | |
1311 | .name = "via-camera", | |
1312 | .minor = -1, | |
1313 | .tvnorms = V4L2_STD_NTSC_M, | |
1314 | .current_norm = V4L2_STD_NTSC_M, | |
1315 | .fops = &viacam_fops, | |
1316 | .ioctl_ops = &viacam_ioctl_ops, | |
1317 | .release = video_device_release_empty, /* Check this */ | |
1318 | }; | |
1319 | ||
c6384c88 DD |
1320 | /* |
1321 | * The OLPC folks put the serial port on the same pin as | |
1322 | * the camera. They also get grumpy if we break the | |
1323 | * serial port and keep them from using it. So we have | |
1324 | * to check the serial enable bit and not step on it. | |
1325 | */ | |
1326 | #define VIACAM_SERIAL_DEVFN 0x88 | |
1327 | #define VIACAM_SERIAL_CREG 0x46 | |
1328 | #define VIACAM_SERIAL_BIT 0x40 | |
1329 | ||
1330 | static __devinit bool viacam_serial_is_enabled(void) | |
1331 | { | |
1332 | struct pci_bus *pbus = pci_find_bus(0, 0); | |
1333 | u8 cbyte; | |
1334 | ||
c8814df3 JJ |
1335 | if (!pbus) |
1336 | return false; | |
c6384c88 DD |
1337 | pci_bus_read_config_byte(pbus, VIACAM_SERIAL_DEVFN, |
1338 | VIACAM_SERIAL_CREG, &cbyte); | |
1339 | if ((cbyte & VIACAM_SERIAL_BIT) == 0) | |
1340 | return false; /* Not enabled */ | |
1341 | if (override_serial == 0) { | |
1342 | printk(KERN_NOTICE "Via camera: serial port is enabled, " \ | |
1343 | "refusing to load.\n"); | |
1344 | printk(KERN_NOTICE "Specify override_serial=1 to force " \ | |
1345 | "module loading.\n"); | |
1346 | return true; | |
1347 | } | |
1348 | printk(KERN_NOTICE "Via camera: overriding serial port\n"); | |
1349 | pci_bus_write_config_byte(pbus, VIACAM_SERIAL_DEVFN, | |
1350 | VIACAM_SERIAL_CREG, cbyte & ~VIACAM_SERIAL_BIT); | |
1351 | return false; | |
1352 | } | |
024fafba JC |
1353 | |
1354 | static __devinit int viacam_probe(struct platform_device *pdev) | |
1355 | { | |
1356 | int ret; | |
1357 | struct i2c_adapter *sensor_adapter; | |
1358 | struct viafb_dev *viadev = pdev->dev.platform_data; | |
1359 | ||
1360 | /* | |
1361 | * Note that there are actually two capture channels on | |
1362 | * the device. We only deal with one for now. That | |
1363 | * is encoded here; nothing else assumes it's dealing with | |
1364 | * a unique capture device. | |
1365 | */ | |
1366 | struct via_camera *cam; | |
1367 | ||
1368 | /* | |
1369 | * Ensure that frame buffer memory has been set aside for | |
1370 | * this purpose. As an arbitrary limit, refuse to work | |
1371 | * with less than two frames of VGA 16-bit data. | |
1372 | * | |
1373 | * If we ever support the second port, we'll need to set | |
1374 | * aside more memory. | |
1375 | */ | |
1376 | if (viadev->camera_fbmem_size < (VGA_HEIGHT*VGA_WIDTH*4)) { | |
1377 | printk(KERN_ERR "viacam: insufficient FB memory reserved\n"); | |
1378 | return -ENOMEM; | |
1379 | } | |
1380 | if (viadev->engine_mmio == NULL) { | |
1381 | printk(KERN_ERR "viacam: No I/O memory, so no pictures\n"); | |
1382 | return -ENOMEM; | |
1383 | } | |
c6384c88 DD |
1384 | |
1385 | if (machine_is_olpc() && viacam_serial_is_enabled()) | |
1386 | return -EBUSY; | |
1387 | ||
024fafba JC |
1388 | /* |
1389 | * Basic structure initialization. | |
1390 | */ | |
1391 | cam = kzalloc (sizeof(struct via_camera), GFP_KERNEL); | |
1392 | if (cam == NULL) | |
1393 | return -ENOMEM; | |
1394 | via_cam_info = cam; | |
1395 | cam->platdev = pdev; | |
1396 | cam->viadev = viadev; | |
1397 | cam->users = 0; | |
1398 | cam->owner = NULL; | |
1399 | cam->opstate = S_IDLE; | |
1400 | cam->user_format = cam->sensor_format = viacam_def_pix_format; | |
1401 | mutex_init(&cam->lock); | |
1402 | INIT_LIST_HEAD(&cam->buffer_queue); | |
1403 | cam->mmio = viadev->engine_mmio; | |
1404 | cam->fbmem = viadev->fbmem; | |
1405 | cam->fb_offset = viadev->camera_fbmem_offset; | |
1406 | cam->flags = 1 << CF_CONFIG_NEEDED; | |
1407 | cam->mbus_code = via_def_mbus_code; | |
1408 | /* | |
1409 | * Tell V4L that we exist. | |
1410 | */ | |
1411 | ret = v4l2_device_register(&pdev->dev, &cam->v4l2_dev); | |
1412 | if (ret) { | |
1413 | dev_err(&pdev->dev, "Unable to register v4l2 device\n"); | |
1414 | return ret; | |
1415 | } | |
1416 | /* | |
1417 | * Convince the system that we can do DMA. | |
1418 | */ | |
1419 | pdev->dev.dma_mask = &viadev->pdev->dma_mask; | |
1420 | dma_set_mask(&pdev->dev, 0xffffffff); | |
1421 | /* | |
1422 | * Fire up the capture port. The write to 0x78 looks purely | |
1423 | * OLPCish; any system will need to tweak 0x1e. | |
1424 | */ | |
1425 | via_write_reg_mask(VIASR, 0x78, 0, 0x80); | |
1426 | via_write_reg_mask(VIASR, 0x1e, 0xc0, 0xc0); | |
1427 | /* | |
1428 | * Get the sensor powered up. | |
1429 | */ | |
1430 | ret = via_sensor_power_setup(cam); | |
1431 | if (ret) | |
1432 | goto out_unregister; | |
1433 | via_sensor_power_up(cam); | |
1434 | ||
1435 | /* | |
1436 | * See if we can't find it on the bus. The VIA_PORT_31 assumption | |
1437 | * is OLPC-specific. 0x42 assumption is ov7670-specific. | |
1438 | */ | |
1439 | sensor_adapter = viafb_find_i2c_adapter(VIA_PORT_31); | |
1440 | cam->sensor = v4l2_i2c_new_subdev(&cam->v4l2_dev, sensor_adapter, | |
9a1f8b34 | 1441 | "ov7670", 0x42 >> 1, NULL); |
024fafba JC |
1442 | if (cam->sensor == NULL) { |
1443 | dev_err(&pdev->dev, "Unable to find the sensor!\n"); | |
1444 | ret = -ENODEV; | |
1445 | goto out_power_down; | |
1446 | } | |
1447 | /* | |
1448 | * Get the IRQ. | |
1449 | */ | |
1450 | viacam_int_disable(cam); | |
1451 | ret = request_threaded_irq(viadev->pdev->irq, viacam_quick_irq, | |
1452 | viacam_irq, IRQF_SHARED, "via-camera", cam); | |
1453 | if (ret) | |
1454 | goto out_power_down; | |
1455 | /* | |
1456 | * Tell V4l2 that we exist. | |
1457 | */ | |
1458 | cam->vdev = viacam_v4l_template; | |
1459 | cam->vdev.v4l2_dev = &cam->v4l2_dev; | |
1460 | ret = video_register_device(&cam->vdev, VFL_TYPE_GRABBER, -1); | |
1461 | if (ret) | |
1462 | goto out_irq; | |
1463 | video_set_drvdata(&cam->vdev, cam); | |
1464 | ||
0522921c DD |
1465 | #ifdef CONFIG_PM |
1466 | /* | |
1467 | * Hook into PM events | |
1468 | */ | |
1469 | viacam_pm_hooks.private = cam; | |
1470 | viafb_pm_register(&viacam_pm_hooks); | |
1471 | #endif | |
1472 | ||
024fafba JC |
1473 | /* Power the sensor down until somebody opens the device */ |
1474 | via_sensor_power_down(cam); | |
1475 | return 0; | |
1476 | ||
1477 | out_irq: | |
1478 | free_irq(viadev->pdev->irq, cam); | |
1479 | out_power_down: | |
1480 | via_sensor_power_release(cam); | |
1481 | out_unregister: | |
1482 | v4l2_device_unregister(&cam->v4l2_dev); | |
1483 | return ret; | |
1484 | } | |
1485 | ||
1486 | static __devexit int viacam_remove(struct platform_device *pdev) | |
1487 | { | |
1488 | struct via_camera *cam = via_cam_info; | |
1489 | struct viafb_dev *viadev = pdev->dev.platform_data; | |
1490 | ||
1491 | video_unregister_device(&cam->vdev); | |
1492 | v4l2_device_unregister(&cam->v4l2_dev); | |
1493 | free_irq(viadev->pdev->irq, cam); | |
1494 | via_sensor_power_release(cam); | |
1495 | via_cam_info = NULL; | |
1496 | return 0; | |
1497 | } | |
1498 | ||
024fafba JC |
1499 | static struct platform_driver viacam_driver = { |
1500 | .driver = { | |
1501 | .name = "viafb-camera", | |
1502 | }, | |
1503 | .probe = viacam_probe, | |
1504 | .remove = viacam_remove, | |
1505 | }; | |
1506 | ||
024fafba JC |
1507 | static int viacam_init(void) |
1508 | { | |
024fafba JC |
1509 | return platform_driver_register(&viacam_driver); |
1510 | } | |
1511 | module_init(viacam_init); | |
1512 | ||
1513 | static void viacam_exit(void) | |
1514 | { | |
1515 | platform_driver_unregister(&viacam_driver); | |
1516 | } | |
1517 | module_exit(viacam_exit); |