1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * Driver for the VIA Chrome integrated camera controller. |
4 | * |
5 | * Copyright 2009,2010 Jonathan Corbet <corbet@lwn.net> |
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/consumer.h> |
15 | #include <linux/interrupt.h> |
16 | #include <linux/platform_device.h> |
17 | #include <linux/videodev2.h> |
18 | #include <media/v4l2-device.h> |
19 | #include <media/v4l2-ioctl.h> |
20 | #include <media/v4l2-ctrls.h> |
21 | #include <media/v4l2-event.h> |
22 | #include <media/v4l2-image-sizes.h> |
23 | #include <media/i2c/ov7670.h> |
24 | #include <media/videobuf2-dma-sg.h> |
25 | #include <linux/delay.h> |
26 | #include <linux/dma-mapping.h> |
27 | #include <linux/pm_qos.h> |
28 | #include <linux/via-core.h> |
29 | #include <linux/via_i2c.h> |
30 | |
31 | #ifdef CONFIG_X86 |
32 | #include <asm/olpc.h> |
33 | #else |
34 | #define machine_is_olpc(x) 0 |
35 | #endif |
36 | |
37 | #include "via-camera.h" |
38 | |
39 | MODULE_ALIAS("platform:viafb-camera" ); |
40 | MODULE_AUTHOR("Jonathan Corbet <corbet@lwn.net>" ); |
41 | MODULE_DESCRIPTION("VIA framebuffer-based camera controller driver" ); |
42 | MODULE_LICENSE("GPL" ); |
43 | |
44 | static bool flip_image; |
45 | module_param(flip_image, bool, 0444); |
46 | MODULE_PARM_DESC(flip_image, |
47 | "If set, the sensor will be instructed to flip the image vertically." ); |
48 | |
49 | static bool override_serial; |
50 | module_param(override_serial, bool, 0444); |
51 | MODULE_PARM_DESC(override_serial, |
52 | "The camera driver will normally refuse to load if the XO 1.5 serial port is enabled. Set this option to force-enable the camera." ); |
53 | |
54 | /* |
55 | * The structure describing our camera. |
56 | */ |
57 | enum viacam_opstate { S_IDLE = 0, S_RUNNING = 1 }; |
58 | |
59 | struct via_camera { |
60 | struct v4l2_device v4l2_dev; |
61 | struct v4l2_ctrl_handler ctrl_handler; |
62 | struct video_device vdev; |
63 | struct v4l2_subdev *sensor; |
64 | struct platform_device *platdev; |
65 | struct viafb_dev *viadev; |
66 | struct mutex lock; |
67 | enum viacam_opstate opstate; |
68 | unsigned long flags; |
69 | struct pm_qos_request qos_request; |
70 | /* |
71 | * GPIO info for power/reset management |
72 | */ |
73 | struct gpio_desc *power_gpio; |
74 | struct gpio_desc *reset_gpio; |
75 | /* |
76 | * I/O memory stuff. |
77 | */ |
78 | void __iomem *mmio; /* Where the registers live */ |
79 | void __iomem *fbmem; /* Frame buffer memory */ |
80 | u32 fb_offset; /* Reserved memory offset (FB) */ |
81 | /* |
82 | * Capture buffers and related. The controller supports |
83 | * up to three, so that's what we have here. These buffers |
84 | * live in frame buffer memory, so we don't call them "DMA". |
85 | */ |
86 | unsigned int cb_offsets[3]; /* offsets into fb mem */ |
87 | u8 __iomem *cb_addrs[3]; /* Kernel-space addresses */ |
88 | int n_cap_bufs; /* How many are we using? */ |
89 | struct vb2_queue vq; |
90 | struct list_head buffer_queue; |
91 | u32 sequence; |
92 | /* |
93 | * Video format information. sensor_format is kept in a form |
94 | * that we can use to pass to the sensor. We always run the |
95 | * sensor in VGA resolution, though, and let the controller |
96 | * downscale things if need be. So we keep the "real* |
97 | * dimensions separately. |
98 | */ |
99 | struct v4l2_pix_format sensor_format; |
100 | struct v4l2_pix_format user_format; |
101 | u32 mbus_code; |
102 | }; |
103 | |
104 | /* buffer for one video frame */ |
105 | struct via_buffer { |
106 | /* common v4l buffer stuff -- must be first */ |
107 | struct vb2_v4l2_buffer vbuf; |
108 | struct list_head queue; |
109 | }; |
110 | |
111 | /* |
112 | * Yes, this is a hack, but there's only going to be one of these |
113 | * on any system we know of. |
114 | */ |
115 | static struct via_camera *via_cam_info; |
116 | |
117 | /* |
118 | * Flag values, manipulated with bitops |
119 | */ |
120 | #define CF_DMA_ACTIVE 0 /* A frame is incoming */ |
121 | #define CF_CONFIG_NEEDED 1 /* Must configure hardware */ |
122 | |
123 | |
124 | /* |
125 | * Nasty ugly v4l2 boilerplate. |
126 | */ |
127 | #define sensor_call(cam, optype, func, args...) \ |
128 | v4l2_subdev_call(cam->sensor, optype, func, ##args) |
129 | |
130 | /* |
131 | * Debugging and related. |
132 | */ |
133 | #define cam_err(cam, fmt, arg...) \ |
134 | dev_err(&(cam)->platdev->dev, fmt, ##arg) |
135 | #define cam_warn(cam, fmt, arg...) \ |
136 | dev_warn(&(cam)->platdev->dev, fmt, ##arg) |
137 | #define cam_dbg(cam, fmt, arg...) \ |
138 | dev_dbg(&(cam)->platdev->dev, fmt, ##arg) |
139 | |
140 | /* |
141 | * Format handling. This is ripped almost directly from Hans's changes |
142 | * to cafe_ccic.c. It's a little unfortunate; until this change, we |
143 | * didn't need to know anything about the format except its byte depth; |
144 | * now this information must be managed at this level too. |
145 | */ |
146 | static struct via_format { |
147 | __u32 pixelformat; |
148 | int bpp; /* Bytes per pixel */ |
149 | u32 mbus_code; |
150 | } via_formats[] = { |
151 | { |
152 | .pixelformat = V4L2_PIX_FMT_YUYV, |
153 | .mbus_code = MEDIA_BUS_FMT_YUYV8_2X8, |
154 | .bpp = 2, |
155 | }, |
156 | /* RGB444 and Bayer should be doable, but have never been |
157 | tested with this driver. RGB565 seems to work at the default |
158 | resolution, but results in color corruption when being scaled by |
159 | viacam_set_scaled(), and is disabled as a result. */ |
160 | }; |
161 | #define N_VIA_FMTS ARRAY_SIZE(via_formats) |
162 | |
163 | static struct via_format *via_find_format(u32 pixelformat) |
164 | { |
165 | unsigned i; |
166 | |
167 | for (i = 0; i < N_VIA_FMTS; i++) |
168 | if (via_formats[i].pixelformat == pixelformat) |
169 | return via_formats + i; |
170 | /* Not found? Then return the first format. */ |
171 | return via_formats; |
172 | } |
173 | |
174 | |
175 | /*--------------------------------------------------------------------------*/ |
176 | /* |
177 | * Sensor power/reset management. This piece is OLPC-specific for |
178 | * sure; other configurations will have things connected differently. |
179 | */ |
180 | static int via_sensor_power_setup(struct via_camera *cam) |
181 | { |
182 | struct device *dev = &cam->platdev->dev; |
183 | |
184 | cam->power_gpio = devm_gpiod_get(dev, con_id: "VGPIO3" , flags: GPIOD_OUT_LOW); |
185 | if (IS_ERR(ptr: cam->power_gpio)) |
186 | return dev_err_probe(dev, err: PTR_ERR(ptr: cam->power_gpio), |
187 | fmt: "failed to get power GPIO" ); |
188 | |
189 | /* Request the reset line asserted */ |
190 | cam->reset_gpio = devm_gpiod_get(dev, con_id: "VGPIO2" , flags: GPIOD_OUT_HIGH); |
191 | if (IS_ERR(ptr: cam->reset_gpio)) |
192 | return dev_err_probe(dev, err: PTR_ERR(ptr: cam->reset_gpio), |
193 | fmt: "failed to get reset GPIO" ); |
194 | |
195 | return 0; |
196 | } |
197 | |
198 | /* |
199 | * Power up the sensor and perform the reset dance. |
200 | */ |
201 | static void via_sensor_power_up(struct via_camera *cam) |
202 | { |
203 | gpiod_set_value(desc: cam->power_gpio, value: 1); |
204 | gpiod_set_value(desc: cam->reset_gpio, value: 1); |
205 | msleep(msecs: 20); /* Probably excessive */ |
206 | gpiod_set_value(desc: cam->reset_gpio, value: 0); |
207 | msleep(msecs: 20); |
208 | } |
209 | |
210 | static void via_sensor_power_down(struct via_camera *cam) |
211 | { |
212 | gpiod_set_value(desc: cam->power_gpio, value: 0); |
213 | gpiod_set_value(desc: cam->reset_gpio, value: 1); |
214 | } |
215 | |
216 | |
217 | static void via_sensor_power_release(struct via_camera *cam) |
218 | { |
219 | via_sensor_power_down(cam); |
220 | } |
221 | |
222 | /* --------------------------------------------------------------------------*/ |
223 | /* Sensor ops */ |
224 | |
225 | /* |
226 | * Manage the ov7670 "flip" bit, which needs special help. |
227 | */ |
228 | static int viacam_set_flip(struct via_camera *cam) |
229 | { |
230 | struct v4l2_control ctrl; |
231 | |
232 | memset(&ctrl, 0, sizeof(ctrl)); |
233 | ctrl.id = V4L2_CID_VFLIP; |
234 | ctrl.value = flip_image; |
235 | return v4l2_s_ctrl(NULL, hdl: cam->sensor->ctrl_handler, ctrl: &ctrl); |
236 | } |
237 | |
238 | /* |
239 | * Configure the sensor. It's up to the caller to ensure |
240 | * that the camera is in the correct operating state. |
241 | */ |
242 | static int viacam_configure_sensor(struct via_camera *cam) |
243 | { |
244 | struct v4l2_subdev_format format = { |
245 | .which = V4L2_SUBDEV_FORMAT_ACTIVE, |
246 | }; |
247 | int ret; |
248 | |
249 | v4l2_fill_mbus_format(mbus_fmt: &format.format, pix_fmt: &cam->sensor_format, code: cam->mbus_code); |
250 | ret = sensor_call(cam, core, init, 0); |
251 | if (ret == 0) |
252 | ret = sensor_call(cam, pad, set_fmt, NULL, &format); |
253 | /* |
254 | * OV7670 does weird things if flip is set *before* format... |
255 | */ |
256 | if (ret == 0) |
257 | ret = viacam_set_flip(cam); |
258 | return ret; |
259 | } |
260 | |
261 | |
262 | |
263 | /* --------------------------------------------------------------------------*/ |
264 | /* |
265 | * Some simple register accessors; they assume that the lock is held. |
266 | * |
267 | * Should we want to support the second capture engine, we could |
268 | * hide the register difference by adding 0x1000 to registers in the |
269 | * 0x300-350 range. |
270 | */ |
271 | static inline void viacam_write_reg(struct via_camera *cam, |
272 | int reg, int value) |
273 | { |
274 | iowrite32(value, cam->mmio + reg); |
275 | } |
276 | |
277 | static inline int viacam_read_reg(struct via_camera *cam, int reg) |
278 | { |
279 | return ioread32(cam->mmio + reg); |
280 | } |
281 | |
282 | static inline void viacam_write_reg_mask(struct via_camera *cam, |
283 | int reg, int value, int mask) |
284 | { |
285 | int tmp = viacam_read_reg(cam, reg); |
286 | |
287 | tmp = (tmp & ~mask) | (value & mask); |
288 | viacam_write_reg(cam, reg, value: tmp); |
289 | } |
290 | |
291 | |
292 | /* --------------------------------------------------------------------------*/ |
293 | /* Interrupt management and handling */ |
294 | |
295 | static irqreturn_t viacam_quick_irq(int irq, void *data) |
296 | { |
297 | struct via_camera *cam = data; |
298 | irqreturn_t ret = IRQ_NONE; |
299 | int icv; |
300 | |
301 | /* |
302 | * All we do here is to clear the interrupts and tell |
303 | * the handler thread to wake up. |
304 | */ |
305 | spin_lock(lock: &cam->viadev->reg_lock); |
306 | icv = viacam_read_reg(cam, VCR_INTCTRL); |
307 | if (icv & VCR_IC_EAV) { |
308 | icv |= VCR_IC_EAV|VCR_IC_EVBI|VCR_IC_FFULL; |
309 | viacam_write_reg(cam, VCR_INTCTRL, value: icv); |
310 | ret = IRQ_WAKE_THREAD; |
311 | } |
312 | spin_unlock(lock: &cam->viadev->reg_lock); |
313 | return ret; |
314 | } |
315 | |
316 | /* |
317 | * Find the next buffer which has somebody waiting on it. |
318 | */ |
319 | static struct via_buffer *viacam_next_buffer(struct via_camera *cam) |
320 | { |
321 | if (cam->opstate != S_RUNNING) |
322 | return NULL; |
323 | if (list_empty(head: &cam->buffer_queue)) |
324 | return NULL; |
325 | return list_entry(cam->buffer_queue.next, struct via_buffer, queue); |
326 | } |
327 | |
328 | /* |
329 | * The threaded IRQ handler. |
330 | */ |
331 | static irqreturn_t viacam_irq(int irq, void *data) |
332 | { |
333 | struct via_camera *cam = data; |
334 | struct via_buffer *vb; |
335 | int bufn; |
336 | struct sg_table *sgt; |
337 | |
338 | mutex_lock(&cam->lock); |
339 | /* |
340 | * If there is no place to put the data frame, don't bother |
341 | * with anything else. |
342 | */ |
343 | vb = viacam_next_buffer(cam); |
344 | if (vb == NULL) |
345 | goto done; |
346 | /* |
347 | * Figure out which buffer we just completed. |
348 | */ |
349 | bufn = (viacam_read_reg(cam, VCR_INTCTRL) & VCR_IC_ACTBUF) >> 3; |
350 | bufn -= 1; |
351 | if (bufn < 0) |
352 | bufn = cam->n_cap_bufs - 1; |
353 | /* |
354 | * Copy over the data and let any waiters know. |
355 | */ |
356 | sgt = vb2_dma_sg_plane_desc(vb: &vb->vbuf.vb2_buf, plane_no: 0); |
357 | vb->vbuf.vb2_buf.timestamp = ktime_get_ns(); |
358 | viafb_dma_copy_out_sg(offset: cam->cb_offsets[bufn], sg: sgt->sgl, nsg: sgt->nents); |
359 | vb->vbuf.sequence = cam->sequence++; |
360 | vb->vbuf.field = V4L2_FIELD_NONE; |
361 | list_del(entry: &vb->queue); |
362 | vb2_buffer_done(vb: &vb->vbuf.vb2_buf, state: VB2_BUF_STATE_DONE); |
363 | done: |
364 | mutex_unlock(lock: &cam->lock); |
365 | return IRQ_HANDLED; |
366 | } |
367 | |
368 | |
369 | /* |
370 | * These functions must mess around with the general interrupt |
371 | * control register, which is relevant to much more than just the |
372 | * camera. Nothing else uses interrupts, though, as of this writing. |
373 | * Should that situation change, we'll have to improve support at |
374 | * the via-core level. |
375 | */ |
376 | static void viacam_int_enable(struct via_camera *cam) |
377 | { |
378 | viacam_write_reg(cam, VCR_INTCTRL, |
379 | VCR_IC_INTEN|VCR_IC_EAV|VCR_IC_EVBI|VCR_IC_FFULL); |
380 | viafb_irq_enable(VDE_I_C0AVEN); |
381 | } |
382 | |
383 | static void viacam_int_disable(struct via_camera *cam) |
384 | { |
385 | viafb_irq_disable(VDE_I_C0AVEN); |
386 | viacam_write_reg(cam, VCR_INTCTRL, value: 0); |
387 | } |
388 | |
389 | |
390 | |
391 | /* --------------------------------------------------------------------------*/ |
392 | /* Controller operations */ |
393 | |
394 | /* |
395 | * Set up our capture buffers in framebuffer memory. |
396 | */ |
397 | static int viacam_ctlr_cbufs(struct via_camera *cam) |
398 | { |
399 | int nbuf = cam->viadev->camera_fbmem_size/cam->sensor_format.sizeimage; |
400 | int i; |
401 | unsigned int offset; |
402 | |
403 | /* |
404 | * See how many buffers we can work with. |
405 | */ |
406 | if (nbuf >= 3) { |
407 | cam->n_cap_bufs = 3; |
408 | viacam_write_reg_mask(cam, VCR_CAPINTC, VCR_CI_3BUFS, |
409 | VCR_CI_3BUFS); |
410 | } else if (nbuf == 2) { |
411 | cam->n_cap_bufs = 2; |
412 | viacam_write_reg_mask(cam, VCR_CAPINTC, value: 0, VCR_CI_3BUFS); |
413 | } else { |
414 | cam_warn(cam, "Insufficient frame buffer memory\n" ); |
415 | return -ENOMEM; |
416 | } |
417 | /* |
418 | * Set them up. |
419 | */ |
420 | offset = cam->fb_offset; |
421 | for (i = 0; i < cam->n_cap_bufs; i++) { |
422 | cam->cb_offsets[i] = offset; |
423 | cam->cb_addrs[i] = cam->fbmem + offset; |
424 | viacam_write_reg(cam, VCR_VBUF1 + i*4, value: offset & VCR_VBUF_MASK); |
425 | offset += cam->sensor_format.sizeimage; |
426 | } |
427 | return 0; |
428 | } |
429 | |
430 | /* |
431 | * Set the scaling register for downscaling the image. |
432 | * |
433 | * This register works like this... Vertical scaling is enabled |
434 | * by bit 26; if that bit is set, downscaling is controlled by the |
435 | * value in bits 16:25. Those bits are divided by 1024 to get |
436 | * the scaling factor; setting just bit 25 thus cuts the height |
437 | * in half. |
438 | * |
439 | * Horizontal scaling works about the same, but it's enabled by |
440 | * bit 11, with bits 0:10 giving the numerator of a fraction |
441 | * (over 2048) for the scaling value. |
442 | * |
443 | * This function is naive in that, if the user departs from |
444 | * the 3x4 VGA scaling factor, the image will distort. We |
445 | * could work around that if it really seemed important. |
446 | */ |
447 | static void viacam_set_scale(struct via_camera *cam) |
448 | { |
449 | unsigned int avscale; |
450 | int sf; |
451 | |
452 | if (cam->user_format.width == VGA_WIDTH) |
453 | avscale = 0; |
454 | else { |
455 | sf = (cam->user_format.width*2048)/VGA_WIDTH; |
456 | avscale = VCR_AVS_HEN | sf; |
457 | } |
458 | if (cam->user_format.height < VGA_HEIGHT) { |
459 | sf = (1024*cam->user_format.height)/VGA_HEIGHT; |
460 | avscale |= VCR_AVS_VEN | (sf << 16); |
461 | } |
462 | viacam_write_reg(cam, VCR_AVSCALE, value: avscale); |
463 | } |
464 | |
465 | |
466 | /* |
467 | * Configure image-related information into the capture engine. |
468 | */ |
469 | static void viacam_ctlr_image(struct via_camera *cam) |
470 | { |
471 | int cicreg; |
472 | |
473 | /* |
474 | * Disable clock before messing with stuff - from the via |
475 | * sample driver. |
476 | */ |
477 | viacam_write_reg(cam, VCR_CAPINTC, value: ~(VCR_CI_ENABLE|VCR_CI_CLKEN)); |
478 | /* |
479 | * Set up the controller for VGA resolution, modulo magic |
480 | * offsets from the via sample driver. |
481 | */ |
482 | viacam_write_reg(cam, VCR_HORRANGE, value: 0x06200120); |
483 | viacam_write_reg(cam, VCR_VERTRANGE, value: 0x01de0000); |
484 | viacam_set_scale(cam); |
485 | /* |
486 | * Image size info. |
487 | */ |
488 | viacam_write_reg(cam, VCR_MAXDATA, |
489 | value: (cam->sensor_format.height << 16) | |
490 | (cam->sensor_format.bytesperline >> 3)); |
491 | viacam_write_reg(cam, VCR_MAXVBI, value: 0); |
492 | viacam_write_reg(cam, VCR_VSTRIDE, |
493 | value: cam->user_format.bytesperline & VCR_VS_STRIDE); |
494 | /* |
495 | * Set up the capture interface control register, |
496 | * everything but the "go" bit. |
497 | * |
498 | * The FIFO threshold is a bit of a magic number; 8 is what |
499 | * VIA's sample code uses. |
500 | */ |
501 | cicreg = VCR_CI_CLKEN | |
502 | 0x08000000 | /* FIFO threshold */ |
503 | VCR_CI_FLDINV | /* OLPC-specific? */ |
504 | VCR_CI_VREFINV | /* OLPC-specific? */ |
505 | VCR_CI_DIBOTH | /* Capture both fields */ |
506 | VCR_CI_CCIR601_8; |
507 | if (cam->n_cap_bufs == 3) |
508 | cicreg |= VCR_CI_3BUFS; |
509 | /* |
510 | * YUV formats need different byte swapping than RGB. |
511 | */ |
512 | if (cam->user_format.pixelformat == V4L2_PIX_FMT_YUYV) |
513 | cicreg |= VCR_CI_YUYV; |
514 | else |
515 | cicreg |= VCR_CI_UYVY; |
516 | viacam_write_reg(cam, VCR_CAPINTC, value: cicreg); |
517 | } |
518 | |
519 | |
520 | static int viacam_config_controller(struct via_camera *cam) |
521 | { |
522 | int ret; |
523 | unsigned long flags; |
524 | |
525 | spin_lock_irqsave(&cam->viadev->reg_lock, flags); |
526 | ret = viacam_ctlr_cbufs(cam); |
527 | if (!ret) |
528 | viacam_ctlr_image(cam); |
529 | spin_unlock_irqrestore(lock: &cam->viadev->reg_lock, flags); |
530 | clear_bit(CF_CONFIG_NEEDED, addr: &cam->flags); |
531 | return ret; |
532 | } |
533 | |
534 | /* |
535 | * Make it start grabbing data. |
536 | */ |
537 | static void viacam_start_engine(struct via_camera *cam) |
538 | { |
539 | spin_lock_irq(lock: &cam->viadev->reg_lock); |
540 | viacam_write_reg_mask(cam, VCR_CAPINTC, VCR_CI_ENABLE, VCR_CI_ENABLE); |
541 | viacam_int_enable(cam); |
542 | (void) viacam_read_reg(cam, VCR_CAPINTC); /* Force post */ |
543 | cam->opstate = S_RUNNING; |
544 | spin_unlock_irq(lock: &cam->viadev->reg_lock); |
545 | } |
546 | |
547 | |
548 | static void viacam_stop_engine(struct via_camera *cam) |
549 | { |
550 | spin_lock_irq(lock: &cam->viadev->reg_lock); |
551 | viacam_int_disable(cam); |
552 | viacam_write_reg_mask(cam, VCR_CAPINTC, value: 0, VCR_CI_ENABLE); |
553 | (void) viacam_read_reg(cam, VCR_CAPINTC); /* Force post */ |
554 | cam->opstate = S_IDLE; |
555 | spin_unlock_irq(lock: &cam->viadev->reg_lock); |
556 | } |
557 | |
558 | |
559 | /* --------------------------------------------------------------------------*/ |
560 | /* vb2 callback ops */ |
561 | |
562 | static struct via_buffer *vb2_to_via_buffer(struct vb2_buffer *vb) |
563 | { |
564 | struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb); |
565 | |
566 | return container_of(vbuf, struct via_buffer, vbuf); |
567 | } |
568 | |
569 | static void viacam_vb2_queue(struct vb2_buffer *vb) |
570 | { |
571 | struct via_camera *cam = vb2_get_drv_priv(q: vb->vb2_queue); |
572 | struct via_buffer *via = vb2_to_via_buffer(vb); |
573 | |
574 | list_add_tail(new: &via->queue, head: &cam->buffer_queue); |
575 | } |
576 | |
577 | static int viacam_vb2_prepare(struct vb2_buffer *vb) |
578 | { |
579 | struct via_camera *cam = vb2_get_drv_priv(q: vb->vb2_queue); |
580 | |
581 | if (vb2_plane_size(vb, plane_no: 0) < cam->user_format.sizeimage) { |
582 | cam_dbg(cam, |
583 | "Plane size too small (%lu < %u)\n" , |
584 | vb2_plane_size(vb, 0), |
585 | cam->user_format.sizeimage); |
586 | return -EINVAL; |
587 | } |
588 | |
589 | vb2_set_plane_payload(vb, plane_no: 0, size: cam->user_format.sizeimage); |
590 | |
591 | return 0; |
592 | } |
593 | |
594 | static int viacam_vb2_queue_setup(struct vb2_queue *vq, |
595 | unsigned int *nbufs, |
596 | unsigned int *num_planes, unsigned int sizes[], |
597 | struct device *alloc_devs[]) |
598 | { |
599 | struct via_camera *cam = vb2_get_drv_priv(q: vq); |
600 | int size = cam->user_format.sizeimage; |
601 | |
602 | if (*num_planes) |
603 | return sizes[0] < size ? -EINVAL : 0; |
604 | |
605 | *num_planes = 1; |
606 | sizes[0] = size; |
607 | return 0; |
608 | } |
609 | |
610 | static int viacam_vb2_start_streaming(struct vb2_queue *vq, unsigned int count) |
611 | { |
612 | struct via_camera *cam = vb2_get_drv_priv(q: vq); |
613 | struct via_buffer *buf, *tmp; |
614 | int ret = 0; |
615 | |
616 | if (cam->opstate != S_IDLE) { |
617 | ret = -EBUSY; |
618 | goto out; |
619 | } |
620 | /* |
621 | * Configure things if need be. |
622 | */ |
623 | if (test_bit(CF_CONFIG_NEEDED, &cam->flags)) { |
624 | ret = viacam_configure_sensor(cam); |
625 | if (ret) |
626 | goto out; |
627 | ret = viacam_config_controller(cam); |
628 | if (ret) |
629 | goto out; |
630 | } |
631 | cam->sequence = 0; |
632 | /* |
633 | * If the CPU goes into C3, the DMA transfer gets corrupted and |
634 | * users start filing unsightly bug reports. Put in a "latency" |
635 | * requirement which will keep the CPU out of the deeper sleep |
636 | * states. |
637 | */ |
638 | cpu_latency_qos_add_request(req: &cam->qos_request, value: 50); |
639 | viacam_start_engine(cam); |
640 | return 0; |
641 | out: |
642 | list_for_each_entry_safe(buf, tmp, &cam->buffer_queue, queue) { |
643 | list_del(entry: &buf->queue); |
644 | vb2_buffer_done(vb: &buf->vbuf.vb2_buf, state: VB2_BUF_STATE_QUEUED); |
645 | } |
646 | return ret; |
647 | } |
648 | |
649 | static void viacam_vb2_stop_streaming(struct vb2_queue *vq) |
650 | { |
651 | struct via_camera *cam = vb2_get_drv_priv(q: vq); |
652 | struct via_buffer *buf, *tmp; |
653 | |
654 | cpu_latency_qos_remove_request(req: &cam->qos_request); |
655 | viacam_stop_engine(cam); |
656 | |
657 | list_for_each_entry_safe(buf, tmp, &cam->buffer_queue, queue) { |
658 | list_del(entry: &buf->queue); |
659 | vb2_buffer_done(vb: &buf->vbuf.vb2_buf, state: VB2_BUF_STATE_ERROR); |
660 | } |
661 | } |
662 | |
663 | static const struct vb2_ops viacam_vb2_ops = { |
664 | .queue_setup = viacam_vb2_queue_setup, |
665 | .buf_queue = viacam_vb2_queue, |
666 | .buf_prepare = viacam_vb2_prepare, |
667 | .start_streaming = viacam_vb2_start_streaming, |
668 | .stop_streaming = viacam_vb2_stop_streaming, |
669 | .wait_prepare = vb2_ops_wait_prepare, |
670 | .wait_finish = vb2_ops_wait_finish, |
671 | }; |
672 | |
673 | /* --------------------------------------------------------------------------*/ |
674 | /* File operations */ |
675 | |
676 | static int viacam_open(struct file *filp) |
677 | { |
678 | struct via_camera *cam = video_drvdata(file: filp); |
679 | int ret; |
680 | |
681 | /* |
682 | * Note the new user. If this is the first one, we'll also |
683 | * need to power up the sensor. |
684 | */ |
685 | mutex_lock(&cam->lock); |
686 | ret = v4l2_fh_open(filp); |
687 | if (ret) |
688 | goto out; |
689 | if (v4l2_fh_is_singular_file(filp)) { |
690 | ret = viafb_request_dma(); |
691 | |
692 | if (ret) { |
693 | v4l2_fh_release(filp); |
694 | goto out; |
695 | } |
696 | via_sensor_power_up(cam); |
697 | set_bit(CF_CONFIG_NEEDED, addr: &cam->flags); |
698 | } |
699 | out: |
700 | mutex_unlock(lock: &cam->lock); |
701 | return ret; |
702 | } |
703 | |
704 | static int viacam_release(struct file *filp) |
705 | { |
706 | struct via_camera *cam = video_drvdata(file: filp); |
707 | bool last_open; |
708 | |
709 | mutex_lock(&cam->lock); |
710 | last_open = v4l2_fh_is_singular_file(filp); |
711 | _vb2_fop_release(file: filp, NULL); |
712 | /* |
713 | * Last one out needs to turn out the lights. |
714 | */ |
715 | if (last_open) { |
716 | via_sensor_power_down(cam); |
717 | viafb_release_dma(); |
718 | } |
719 | mutex_unlock(lock: &cam->lock); |
720 | return 0; |
721 | } |
722 | |
723 | static const struct v4l2_file_operations viacam_fops = { |
724 | .owner = THIS_MODULE, |
725 | .open = viacam_open, |
726 | .release = viacam_release, |
727 | .read = vb2_fop_read, |
728 | .poll = vb2_fop_poll, |
729 | .mmap = vb2_fop_mmap, |
730 | .unlocked_ioctl = video_ioctl2, |
731 | }; |
732 | |
733 | /*----------------------------------------------------------------------------*/ |
734 | /* |
735 | * The long list of v4l2 ioctl ops |
736 | */ |
737 | |
738 | /* |
739 | * Only one input. |
740 | */ |
741 | static int viacam_enum_input(struct file *filp, void *priv, |
742 | struct v4l2_input *input) |
743 | { |
744 | if (input->index != 0) |
745 | return -EINVAL; |
746 | |
747 | input->type = V4L2_INPUT_TYPE_CAMERA; |
748 | strscpy(input->name, "Camera" , sizeof(input->name)); |
749 | return 0; |
750 | } |
751 | |
752 | static int viacam_g_input(struct file *filp, void *priv, unsigned int *i) |
753 | { |
754 | *i = 0; |
755 | return 0; |
756 | } |
757 | |
758 | static int viacam_s_input(struct file *filp, void *priv, unsigned int i) |
759 | { |
760 | if (i != 0) |
761 | return -EINVAL; |
762 | return 0; |
763 | } |
764 | |
765 | /* |
766 | * Video format stuff. Here is our default format until |
767 | * user space messes with things. |
768 | */ |
769 | static const struct v4l2_pix_format viacam_def_pix_format = { |
770 | .width = VGA_WIDTH, |
771 | .height = VGA_HEIGHT, |
772 | .pixelformat = V4L2_PIX_FMT_YUYV, |
773 | .field = V4L2_FIELD_NONE, |
774 | .bytesperline = VGA_WIDTH * 2, |
775 | .sizeimage = VGA_WIDTH * VGA_HEIGHT * 2, |
776 | .colorspace = V4L2_COLORSPACE_SRGB, |
777 | }; |
778 | |
779 | static const u32 via_def_mbus_code = MEDIA_BUS_FMT_YUYV8_2X8; |
780 | |
781 | static int viacam_enum_fmt_vid_cap(struct file *filp, void *priv, |
782 | struct v4l2_fmtdesc *fmt) |
783 | { |
784 | if (fmt->index >= N_VIA_FMTS) |
785 | return -EINVAL; |
786 | fmt->pixelformat = via_formats[fmt->index].pixelformat; |
787 | return 0; |
788 | } |
789 | |
790 | /* |
791 | * Figure out proper image dimensions, but always force the |
792 | * sensor to VGA. |
793 | */ |
794 | static void viacam_fmt_pre(struct v4l2_pix_format *userfmt, |
795 | struct v4l2_pix_format *sensorfmt) |
796 | { |
797 | *sensorfmt = *userfmt; |
798 | if (userfmt->width < QCIF_WIDTH || userfmt->height < QCIF_HEIGHT) { |
799 | userfmt->width = QCIF_WIDTH; |
800 | userfmt->height = QCIF_HEIGHT; |
801 | } |
802 | if (userfmt->width > VGA_WIDTH || userfmt->height > VGA_HEIGHT) { |
803 | userfmt->width = VGA_WIDTH; |
804 | userfmt->height = VGA_HEIGHT; |
805 | } |
806 | sensorfmt->width = VGA_WIDTH; |
807 | sensorfmt->height = VGA_HEIGHT; |
808 | } |
809 | |
810 | static void viacam_fmt_post(struct v4l2_pix_format *userfmt, |
811 | struct v4l2_pix_format *sensorfmt) |
812 | { |
813 | struct via_format *f = via_find_format(pixelformat: userfmt->pixelformat); |
814 | |
815 | sensorfmt->bytesperline = sensorfmt->width * f->bpp; |
816 | sensorfmt->sizeimage = sensorfmt->height * sensorfmt->bytesperline; |
817 | userfmt->pixelformat = sensorfmt->pixelformat; |
818 | userfmt->field = sensorfmt->field; |
819 | userfmt->bytesperline = 2 * userfmt->width; |
820 | userfmt->sizeimage = userfmt->bytesperline * userfmt->height; |
821 | userfmt->colorspace = sensorfmt->colorspace; |
822 | userfmt->ycbcr_enc = sensorfmt->ycbcr_enc; |
823 | userfmt->quantization = sensorfmt->quantization; |
824 | userfmt->xfer_func = sensorfmt->xfer_func; |
825 | } |
826 | |
827 | |
828 | /* |
829 | * The real work of figuring out a workable format. |
830 | */ |
831 | static int viacam_do_try_fmt(struct via_camera *cam, |
832 | struct v4l2_pix_format *upix, struct v4l2_pix_format *spix) |
833 | { |
834 | int ret; |
835 | struct v4l2_subdev_pad_config pad_cfg; |
836 | struct v4l2_subdev_state pad_state = { |
837 | .pads = &pad_cfg, |
838 | }; |
839 | struct v4l2_subdev_format format = { |
840 | .which = V4L2_SUBDEV_FORMAT_TRY, |
841 | }; |
842 | struct via_format *f = via_find_format(pixelformat: upix->pixelformat); |
843 | |
844 | upix->pixelformat = f->pixelformat; |
845 | viacam_fmt_pre(userfmt: upix, sensorfmt: spix); |
846 | v4l2_fill_mbus_format(mbus_fmt: &format.format, pix_fmt: spix, code: f->mbus_code); |
847 | ret = sensor_call(cam, pad, set_fmt, &pad_state, &format); |
848 | v4l2_fill_pix_format(pix_fmt: spix, mbus_fmt: &format.format); |
849 | viacam_fmt_post(userfmt: upix, sensorfmt: spix); |
850 | return ret; |
851 | } |
852 | |
853 | |
854 | |
855 | static int viacam_try_fmt_vid_cap(struct file *filp, void *priv, |
856 | struct v4l2_format *fmt) |
857 | { |
858 | struct via_camera *cam = video_drvdata(file: filp); |
859 | struct v4l2_format sfmt; |
860 | |
861 | return viacam_do_try_fmt(cam, upix: &fmt->fmt.pix, spix: &sfmt.fmt.pix); |
862 | } |
863 | |
864 | |
865 | static int viacam_g_fmt_vid_cap(struct file *filp, void *priv, |
866 | struct v4l2_format *fmt) |
867 | { |
868 | struct via_camera *cam = video_drvdata(file: filp); |
869 | |
870 | fmt->fmt.pix = cam->user_format; |
871 | return 0; |
872 | } |
873 | |
874 | static int viacam_s_fmt_vid_cap(struct file *filp, void *priv, |
875 | struct v4l2_format *fmt) |
876 | { |
877 | struct via_camera *cam = video_drvdata(file: filp); |
878 | int ret; |
879 | struct v4l2_format sfmt; |
880 | struct via_format *f = via_find_format(pixelformat: fmt->fmt.pix.pixelformat); |
881 | |
882 | /* |
883 | * Camera must be idle or we can't mess with the |
884 | * video setup. |
885 | */ |
886 | if (cam->opstate != S_IDLE) |
887 | return -EBUSY; |
888 | /* |
889 | * Let the sensor code look over and tweak the |
890 | * requested formatting. |
891 | */ |
892 | ret = viacam_do_try_fmt(cam, upix: &fmt->fmt.pix, spix: &sfmt.fmt.pix); |
893 | if (ret) |
894 | return ret; |
895 | /* |
896 | * OK, let's commit to the new format. |
897 | */ |
898 | cam->user_format = fmt->fmt.pix; |
899 | cam->sensor_format = sfmt.fmt.pix; |
900 | cam->mbus_code = f->mbus_code; |
901 | ret = viacam_configure_sensor(cam); |
902 | if (!ret) |
903 | ret = viacam_config_controller(cam); |
904 | return ret; |
905 | } |
906 | |
907 | static int viacam_querycap(struct file *filp, void *priv, |
908 | struct v4l2_capability *cap) |
909 | { |
910 | strscpy(cap->driver, "via-camera" , sizeof(cap->driver)); |
911 | strscpy(cap->card, "via-camera" , sizeof(cap->card)); |
912 | strscpy(cap->bus_info, "platform:via-camera" , sizeof(cap->bus_info)); |
913 | return 0; |
914 | } |
915 | |
916 | /* G/S_PARM */ |
917 | |
918 | static int viacam_g_parm(struct file *filp, void *priv, |
919 | struct v4l2_streamparm *parm) |
920 | { |
921 | struct via_camera *cam = video_drvdata(file: filp); |
922 | |
923 | return v4l2_g_parm_cap(vdev: video_devdata(file: filp), sd: cam->sensor, a: parm); |
924 | } |
925 | |
926 | static int viacam_s_parm(struct file *filp, void *priv, |
927 | struct v4l2_streamparm *parm) |
928 | { |
929 | struct via_camera *cam = video_drvdata(file: filp); |
930 | |
931 | return v4l2_s_parm_cap(vdev: video_devdata(file: filp), sd: cam->sensor, a: parm); |
932 | } |
933 | |
934 | static int viacam_enum_framesizes(struct file *filp, void *priv, |
935 | struct v4l2_frmsizeenum *sizes) |
936 | { |
937 | unsigned int i; |
938 | |
939 | if (sizes->index != 0) |
940 | return -EINVAL; |
941 | for (i = 0; i < N_VIA_FMTS; i++) |
942 | if (sizes->pixel_format == via_formats[i].pixelformat) |
943 | break; |
944 | if (i >= N_VIA_FMTS) |
945 | return -EINVAL; |
946 | sizes->type = V4L2_FRMSIZE_TYPE_CONTINUOUS; |
947 | sizes->stepwise.min_width = QCIF_WIDTH; |
948 | sizes->stepwise.min_height = QCIF_HEIGHT; |
949 | sizes->stepwise.max_width = VGA_WIDTH; |
950 | sizes->stepwise.max_height = VGA_HEIGHT; |
951 | sizes->stepwise.step_width = sizes->stepwise.step_height = 1; |
952 | return 0; |
953 | } |
954 | |
955 | static int viacam_enum_frameintervals(struct file *filp, void *priv, |
956 | struct v4l2_frmivalenum *interval) |
957 | { |
958 | struct via_camera *cam = video_drvdata(file: filp); |
959 | struct v4l2_subdev_frame_interval_enum fie = { |
960 | .index = interval->index, |
961 | .code = cam->mbus_code, |
962 | .width = cam->sensor_format.width, |
963 | .height = cam->sensor_format.height, |
964 | .which = V4L2_SUBDEV_FORMAT_ACTIVE, |
965 | }; |
966 | unsigned int i; |
967 | int ret; |
968 | |
969 | for (i = 0; i < N_VIA_FMTS; i++) |
970 | if (interval->pixel_format == via_formats[i].pixelformat) |
971 | break; |
972 | if (i >= N_VIA_FMTS) |
973 | return -EINVAL; |
974 | if (interval->width < QCIF_WIDTH || interval->width > VGA_WIDTH || |
975 | interval->height < QCIF_HEIGHT || interval->height > VGA_HEIGHT) |
976 | return -EINVAL; |
977 | ret = sensor_call(cam, pad, enum_frame_interval, NULL, &fie); |
978 | if (ret) |
979 | return ret; |
980 | interval->type = V4L2_FRMIVAL_TYPE_DISCRETE; |
981 | interval->discrete = fie.interval; |
982 | return 0; |
983 | } |
984 | |
985 | static const struct v4l2_ioctl_ops viacam_ioctl_ops = { |
986 | .vidioc_enum_input = viacam_enum_input, |
987 | .vidioc_g_input = viacam_g_input, |
988 | .vidioc_s_input = viacam_s_input, |
989 | .vidioc_enum_fmt_vid_cap = viacam_enum_fmt_vid_cap, |
990 | .vidioc_try_fmt_vid_cap = viacam_try_fmt_vid_cap, |
991 | .vidioc_g_fmt_vid_cap = viacam_g_fmt_vid_cap, |
992 | .vidioc_s_fmt_vid_cap = viacam_s_fmt_vid_cap, |
993 | .vidioc_querycap = viacam_querycap, |
994 | .vidioc_reqbufs = vb2_ioctl_reqbufs, |
995 | .vidioc_create_bufs = vb2_ioctl_create_bufs, |
996 | .vidioc_querybuf = vb2_ioctl_querybuf, |
997 | .vidioc_prepare_buf = vb2_ioctl_prepare_buf, |
998 | .vidioc_qbuf = vb2_ioctl_qbuf, |
999 | .vidioc_dqbuf = vb2_ioctl_dqbuf, |
1000 | .vidioc_expbuf = vb2_ioctl_expbuf, |
1001 | .vidioc_streamon = vb2_ioctl_streamon, |
1002 | .vidioc_streamoff = vb2_ioctl_streamoff, |
1003 | .vidioc_g_parm = viacam_g_parm, |
1004 | .vidioc_s_parm = viacam_s_parm, |
1005 | .vidioc_enum_framesizes = viacam_enum_framesizes, |
1006 | .vidioc_enum_frameintervals = viacam_enum_frameintervals, |
1007 | .vidioc_subscribe_event = v4l2_ctrl_subscribe_event, |
1008 | .vidioc_unsubscribe_event = v4l2_event_unsubscribe, |
1009 | }; |
1010 | |
1011 | /*----------------------------------------------------------------------------*/ |
1012 | |
1013 | /* |
1014 | * Power management. |
1015 | */ |
1016 | #ifdef CONFIG_PM |
1017 | |
1018 | static int viacam_suspend(void *priv) |
1019 | { |
1020 | struct via_camera *cam = priv; |
1021 | enum viacam_opstate state = cam->opstate; |
1022 | |
1023 | if (cam->opstate != S_IDLE) { |
1024 | viacam_stop_engine(cam); |
1025 | cam->opstate = state; /* So resume restarts */ |
1026 | } |
1027 | |
1028 | return 0; |
1029 | } |
1030 | |
1031 | static int viacam_resume(void *priv) |
1032 | { |
1033 | struct via_camera *cam = priv; |
1034 | int ret = 0; |
1035 | |
1036 | /* |
1037 | * Get back to a reasonable operating state. |
1038 | */ |
1039 | via_write_reg_mask(VIASR, index: 0x78, data: 0, mask: 0x80); |
1040 | via_write_reg_mask(VIASR, index: 0x1e, data: 0xc0, mask: 0xc0); |
1041 | viacam_int_disable(cam); |
1042 | set_bit(CF_CONFIG_NEEDED, addr: &cam->flags); |
1043 | /* |
1044 | * Make sure the sensor's power state is correct |
1045 | */ |
1046 | if (!list_empty(head: &cam->vdev.fh_list)) |
1047 | via_sensor_power_up(cam); |
1048 | else |
1049 | via_sensor_power_down(cam); |
1050 | /* |
1051 | * If it was operating, try to restart it. |
1052 | */ |
1053 | if (cam->opstate != S_IDLE) { |
1054 | mutex_lock(&cam->lock); |
1055 | ret = viacam_configure_sensor(cam); |
1056 | if (!ret) |
1057 | ret = viacam_config_controller(cam); |
1058 | mutex_unlock(lock: &cam->lock); |
1059 | if (!ret) |
1060 | viacam_start_engine(cam); |
1061 | } |
1062 | |
1063 | return ret; |
1064 | } |
1065 | |
1066 | static struct viafb_pm_hooks viacam_pm_hooks = { |
1067 | .suspend = viacam_suspend, |
1068 | .resume = viacam_resume |
1069 | }; |
1070 | |
1071 | #endif /* CONFIG_PM */ |
1072 | |
1073 | /* |
1074 | * Setup stuff. |
1075 | */ |
1076 | |
1077 | static const struct video_device viacam_v4l_template = { |
1078 | .name = "via-camera" , |
1079 | .minor = -1, |
1080 | .fops = &viacam_fops, |
1081 | .ioctl_ops = &viacam_ioctl_ops, |
1082 | .release = video_device_release_empty, /* Check this */ |
1083 | .device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_READWRITE | |
1084 | V4L2_CAP_STREAMING, |
1085 | }; |
1086 | |
1087 | /* |
1088 | * The OLPC folks put the serial port on the same pin as |
1089 | * the camera. They also get grumpy if we break the |
1090 | * serial port and keep them from using it. So we have |
1091 | * to check the serial enable bit and not step on it. |
1092 | */ |
1093 | #define VIACAM_SERIAL_DEVFN 0x88 |
1094 | #define VIACAM_SERIAL_CREG 0x46 |
1095 | #define VIACAM_SERIAL_BIT 0x40 |
1096 | |
1097 | static bool viacam_serial_is_enabled(void) |
1098 | { |
1099 | struct pci_bus *pbus = pci_find_bus(domain: 0, busnr: 0); |
1100 | u8 cbyte; |
1101 | |
1102 | if (!pbus) |
1103 | return false; |
1104 | pci_bus_read_config_byte(bus: pbus, VIACAM_SERIAL_DEVFN, |
1105 | VIACAM_SERIAL_CREG, val: &cbyte); |
1106 | if ((cbyte & VIACAM_SERIAL_BIT) == 0) |
1107 | return false; /* Not enabled */ |
1108 | if (!override_serial) { |
1109 | printk(KERN_NOTICE "Via camera: serial port is enabled, " \ |
1110 | "refusing to load.\n" ); |
1111 | printk(KERN_NOTICE "Specify override_serial=1 to force " \ |
1112 | "module loading.\n" ); |
1113 | return true; |
1114 | } |
1115 | printk(KERN_NOTICE "Via camera: overriding serial port\n" ); |
1116 | pci_bus_write_config_byte(bus: pbus, VIACAM_SERIAL_DEVFN, |
1117 | VIACAM_SERIAL_CREG, val: cbyte & ~VIACAM_SERIAL_BIT); |
1118 | return false; |
1119 | } |
1120 | |
1121 | static struct ov7670_config sensor_cfg = { |
1122 | /* The XO-1.5 (only known user) clocks the camera at 90MHz. */ |
1123 | .clock_speed = 90, |
1124 | }; |
1125 | |
1126 | static int viacam_probe(struct platform_device *pdev) |
1127 | { |
1128 | int ret; |
1129 | struct i2c_adapter *sensor_adapter; |
1130 | struct viafb_dev *viadev = pdev->dev.platform_data; |
1131 | struct vb2_queue *vq; |
1132 | struct i2c_board_info ov7670_info = { |
1133 | .type = "ov7670" , |
1134 | .addr = 0x42 >> 1, |
1135 | .platform_data = &sensor_cfg, |
1136 | }; |
1137 | |
1138 | /* |
1139 | * Note that there are actually two capture channels on |
1140 | * the device. We only deal with one for now. That |
1141 | * is encoded here; nothing else assumes it's dealing with |
1142 | * a unique capture device. |
1143 | */ |
1144 | struct via_camera *cam; |
1145 | |
1146 | /* |
1147 | * Ensure that frame buffer memory has been set aside for |
1148 | * this purpose. As an arbitrary limit, refuse to work |
1149 | * with less than two frames of VGA 16-bit data. |
1150 | * |
1151 | * If we ever support the second port, we'll need to set |
1152 | * aside more memory. |
1153 | */ |
1154 | if (viadev->camera_fbmem_size < (VGA_HEIGHT*VGA_WIDTH*4)) { |
1155 | printk(KERN_ERR "viacam: insufficient FB memory reserved\n" ); |
1156 | return -ENOMEM; |
1157 | } |
1158 | if (viadev->engine_mmio == NULL) { |
1159 | printk(KERN_ERR "viacam: No I/O memory, so no pictures\n" ); |
1160 | return -ENOMEM; |
1161 | } |
1162 | |
1163 | if (machine_is_olpc() && viacam_serial_is_enabled()) |
1164 | return -EBUSY; |
1165 | |
1166 | /* |
1167 | * Basic structure initialization. |
1168 | */ |
1169 | cam = kzalloc (size: sizeof(struct via_camera), GFP_KERNEL); |
1170 | if (cam == NULL) |
1171 | return -ENOMEM; |
1172 | via_cam_info = cam; |
1173 | cam->platdev = pdev; |
1174 | cam->viadev = viadev; |
1175 | cam->opstate = S_IDLE; |
1176 | cam->user_format = cam->sensor_format = viacam_def_pix_format; |
1177 | mutex_init(&cam->lock); |
1178 | INIT_LIST_HEAD(list: &cam->buffer_queue); |
1179 | cam->mmio = viadev->engine_mmio; |
1180 | cam->fbmem = viadev->fbmem; |
1181 | cam->fb_offset = viadev->camera_fbmem_offset; |
1182 | cam->flags = 1 << CF_CONFIG_NEEDED; |
1183 | cam->mbus_code = via_def_mbus_code; |
1184 | /* |
1185 | * Tell V4L that we exist. |
1186 | */ |
1187 | ret = v4l2_device_register(dev: &pdev->dev, v4l2_dev: &cam->v4l2_dev); |
1188 | if (ret) { |
1189 | dev_err(&pdev->dev, "Unable to register v4l2 device\n" ); |
1190 | goto out_free; |
1191 | } |
1192 | ret = v4l2_ctrl_handler_init(&cam->ctrl_handler, 10); |
1193 | if (ret) |
1194 | goto out_unregister; |
1195 | cam->v4l2_dev.ctrl_handler = &cam->ctrl_handler; |
1196 | /* |
1197 | * Convince the system that we can do DMA. |
1198 | */ |
1199 | pdev->dev.dma_mask = &viadev->pdev->dma_mask; |
1200 | ret = dma_set_mask(dev: &pdev->dev, mask: 0xffffffff); |
1201 | if (ret) |
1202 | goto out_ctrl_hdl_free; |
1203 | /* |
1204 | * Fire up the capture port. The write to 0x78 looks purely |
1205 | * OLPCish; any system will need to tweak 0x1e. |
1206 | */ |
1207 | via_write_reg_mask(VIASR, index: 0x78, data: 0, mask: 0x80); |
1208 | via_write_reg_mask(VIASR, index: 0x1e, data: 0xc0, mask: 0xc0); |
1209 | /* |
1210 | * Get the sensor powered up. |
1211 | */ |
1212 | ret = via_sensor_power_setup(cam); |
1213 | if (ret) |
1214 | goto out_ctrl_hdl_free; |
1215 | via_sensor_power_up(cam); |
1216 | |
1217 | /* |
1218 | * See if we can't find it on the bus. The VIA_PORT_31 assumption |
1219 | * is OLPC-specific. 0x42 assumption is ov7670-specific. |
1220 | */ |
1221 | sensor_adapter = viafb_find_i2c_adapter(which: VIA_PORT_31); |
1222 | cam->sensor = v4l2_i2c_new_subdev_board(v4l2_dev: &cam->v4l2_dev, adapter: sensor_adapter, |
1223 | info: &ov7670_info, NULL); |
1224 | if (cam->sensor == NULL) { |
1225 | dev_err(&pdev->dev, "Unable to find the sensor!\n" ); |
1226 | ret = -ENODEV; |
1227 | goto out_power_down; |
1228 | } |
1229 | /* |
1230 | * Get the IRQ. |
1231 | */ |
1232 | viacam_int_disable(cam); |
1233 | ret = request_threaded_irq(irq: viadev->pdev->irq, handler: viacam_quick_irq, |
1234 | thread_fn: viacam_irq, IRQF_SHARED, name: "via-camera" , dev: cam); |
1235 | if (ret) |
1236 | goto out_power_down; |
1237 | |
1238 | vq = &cam->vq; |
1239 | vq->type = V4L2_BUF_TYPE_VIDEO_CAPTURE; |
1240 | vq->io_modes = VB2_MMAP | VB2_USERPTR | VB2_DMABUF | VB2_READ; |
1241 | vq->drv_priv = cam; |
1242 | vq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC; |
1243 | vq->buf_struct_size = sizeof(struct via_buffer); |
1244 | vq->dev = cam->v4l2_dev.dev; |
1245 | |
1246 | vq->ops = &viacam_vb2_ops; |
1247 | vq->mem_ops = &vb2_dma_sg_memops; |
1248 | vq->lock = &cam->lock; |
1249 | |
1250 | ret = vb2_queue_init(q: vq); |
1251 | /* |
1252 | * Tell V4l2 that we exist. |
1253 | */ |
1254 | cam->vdev = viacam_v4l_template; |
1255 | cam->vdev.v4l2_dev = &cam->v4l2_dev; |
1256 | cam->vdev.lock = &cam->lock; |
1257 | cam->vdev.queue = vq; |
1258 | video_set_drvdata(vdev: &cam->vdev, data: cam); |
1259 | ret = video_register_device(vdev: &cam->vdev, type: VFL_TYPE_VIDEO, nr: -1); |
1260 | if (ret) |
1261 | goto out_irq; |
1262 | |
1263 | #ifdef CONFIG_PM |
1264 | /* |
1265 | * Hook into PM events |
1266 | */ |
1267 | viacam_pm_hooks.private = cam; |
1268 | viafb_pm_register(hooks: &viacam_pm_hooks); |
1269 | #endif |
1270 | |
1271 | /* Power the sensor down until somebody opens the device */ |
1272 | via_sensor_power_down(cam); |
1273 | return 0; |
1274 | |
1275 | out_irq: |
1276 | free_irq(viadev->pdev->irq, cam); |
1277 | out_power_down: |
1278 | via_sensor_power_release(cam); |
1279 | out_ctrl_hdl_free: |
1280 | v4l2_ctrl_handler_free(hdl: &cam->ctrl_handler); |
1281 | out_unregister: |
1282 | v4l2_device_unregister(v4l2_dev: &cam->v4l2_dev); |
1283 | out_free: |
1284 | kfree(objp: cam); |
1285 | return ret; |
1286 | } |
1287 | |
1288 | static void viacam_remove(struct platform_device *pdev) |
1289 | { |
1290 | struct via_camera *cam = via_cam_info; |
1291 | struct viafb_dev *viadev = pdev->dev.platform_data; |
1292 | |
1293 | video_unregister_device(vdev: &cam->vdev); |
1294 | v4l2_device_unregister(v4l2_dev: &cam->v4l2_dev); |
1295 | #ifdef CONFIG_PM |
1296 | viafb_pm_unregister(hooks: &viacam_pm_hooks); |
1297 | #endif |
1298 | free_irq(viadev->pdev->irq, cam); |
1299 | via_sensor_power_release(cam); |
1300 | v4l2_ctrl_handler_free(hdl: &cam->ctrl_handler); |
1301 | kfree(objp: cam); |
1302 | via_cam_info = NULL; |
1303 | } |
1304 | |
1305 | static struct platform_driver viacam_driver = { |
1306 | .driver = { |
1307 | .name = "viafb-camera" , |
1308 | }, |
1309 | .probe = viacam_probe, |
1310 | .remove_new = viacam_remove, |
1311 | }; |
1312 | |
1313 | module_platform_driver(viacam_driver); |
1314 | |