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V4L/DVB (4841): Added a newer PCI ID to CARDLIST.cx88
[linux-2.6-block.git] / drivers / media / video / cafe_ccic.c
CommitLineData
d905b382
JC		 1/*
2 * A driver for the CMOS camera controller in the Marvell 88ALP01 "cafe"
3 * multifunction chip. Currently works with the Omnivision OV7670
4 * sensor.
5 *
6 * Copyright 2006 One Laptop Per Child Association, Inc.
7 *
8 * Written by Jonathan Corbet, corbet@lwn.net.
9 *
10 * This file may be distributed under the terms of the GNU General
11 * Public License, version 2.
12 */
13
14#include <linux/kernel.h>
15#include <linux/module.h>
16#include <linux/moduleparam.h>
17#include <linux/init.h>
18#include <linux/fs.h>
19#include <linux/pci.h>
20#include <linux/i2c.h>
21#include <linux/interrupt.h>
22#include <linux/spinlock.h>
23#include <linux/videodev2.h>
24#include <media/v4l2-common.h>
25#include <linux/device.h>
26#include <linux/wait.h>
27#include <linux/list.h>
28#include <linux/dma-mapping.h>
29#include <linux/delay.h>
30#include <linux/debugfs.h>
31#include <linux/jiffies.h>
32#include <linux/vmalloc.h>
33
34#include <asm/uaccess.h>
35#include <asm/io.h>
36
37#include "cafe_ccic-regs.h"
38
39#define CAFE_VERSION 0x000001
40
41
42/*
43 * Parameters.
44 */
45MODULE_AUTHOR("Jonathan Corbet <corbet@lwn.net>");
46MODULE_DESCRIPTION("Marvell 88ALP01 CMOS Camera Controller driver");
47MODULE_LICENSE("GPL");
48MODULE_SUPPORTED_DEVICE("Video");
49
50/*
51 * Internal DMA buffer management. Since the controller cannot do S/G I/O,
52 * we must have physically contiguous buffers to bring frames into.
53 * These parameters control how many buffers we use, whether we
54 * allocate them at load time (better chance of success, but nails down
55 * memory) or when somebody tries to use the camera (riskier), and,
56 * for load-time allocation, how big they should be.
57 *
58 * The controller can cycle through three buffers. We could use
59 * more by flipping pointers around, but it probably makes little
60 * sense.
61 */
62
63#define MAX_DMA_BUFS 3
64static int alloc_bufs_at_load = 0;
65module_param(alloc_bufs_at_load, bool, 0444);
66MODULE_PARM_DESC(alloc_bufs_at_load,
67 "Non-zero value causes DMA buffers to be allocated at module "
68 "load time. This increases the chances of successfully getting "
69 "those buffers, but at the cost of nailing down the memory from "
70 "the outset.");
71
72static int n_dma_bufs = 3;
73module_param(n_dma_bufs, uint, 0644);
74MODULE_PARM_DESC(n_dma_bufs,
75 "The number of DMA buffers to allocate. Can be either two "
76 "(saves memory, makes timing tighter) or three.");
77
78static int dma_buf_size = VGA_WIDTH * VGA_HEIGHT * 2; /* Worst case */
79module_param(dma_buf_size, uint, 0444);
80MODULE_PARM_DESC(dma_buf_size,
81 "The size of the allocated DMA buffers. If actual operating "
82 "parameters require larger buffers, an attempt to reallocate "
83 "will be made.");
84
85static int min_buffers = 1;
86module_param(min_buffers, uint, 0644);
87MODULE_PARM_DESC(min_buffers,
88 "The minimum number of streaming I/O buffers we are willing "
89 "to work with.");
90
91static int max_buffers = 10;
92module_param(max_buffers, uint, 0644);
93MODULE_PARM_DESC(max_buffers,
94 "The maximum number of streaming I/O buffers an application "
95 "will be allowed to allocate. These buffers are big and live "
96 "in vmalloc space.");
97
98static int flip = 0;
99module_param(flip, bool, 0444);
100MODULE_PARM_DESC(flip,
101 "If set, the sensor will be instructed to flip the image "
102 "vertically.");
103
104
105enum cafe_state {
106 S_NOTREADY, /* Not yet initialized */
107 S_IDLE, /* Just hanging around */
108 S_FLAKED, /* Some sort of problem */
109 S_SINGLEREAD, /* In read() */
110 S_SPECREAD, /* Speculative read (for future read()) */
111 S_STREAMING /* Streaming data */
112};
113
114/*
115 * Tracking of streaming I/O buffers.
116 */
117struct cafe_sio_buffer {
118 struct list_head list;
119 struct v4l2_buffer v4lbuf;
120 char *buffer; /* Where it lives in kernel space */
121 int mapcount;
122 struct cafe_camera *cam;
123};
124
125/*
126 * A description of one of our devices.
127 * Locking: controlled by s_mutex. Certain fields, however, require
128 * the dev_lock spinlock; they are marked as such by comments.
129 * dev_lock is also required for access to device registers.
130 */
131struct cafe_camera
132{
133 enum cafe_state state;
134 unsigned long flags; /* Buffer status, mainly (dev_lock) */
135 int users; /* How many open FDs */
136 struct file *owner; /* Who has data access (v4l2) */
137
138 /*
139 * Subsystem structures.
140 */
141 struct pci_dev *pdev;
142 struct video_device v4ldev;
143 struct i2c_adapter i2c_adapter;
144 struct i2c_client *sensor;
145
146 unsigned char __iomem *regs;
147 struct list_head dev_list; /* link to other devices */
148
149 /* DMA buffers */
150 unsigned int nbufs; /* How many are alloc'd */
151 int next_buf; /* Next to consume (dev_lock) */
152 unsigned int dma_buf_size; /* allocated size */
153 void *dma_bufs[MAX_DMA_BUFS]; /* Internal buffer addresses */
154 dma_addr_t dma_handles[MAX_DMA_BUFS]; /* Buffer bus addresses */
155 unsigned int specframes; /* Unconsumed spec frames (dev_lock) */
156 unsigned int sequence; /* Frame sequence number */
157 unsigned int buf_seq[MAX_DMA_BUFS]; /* Sequence for individual buffers */
158
159 /* Streaming buffers */
160 unsigned int n_sbufs; /* How many we have */
161 struct cafe_sio_buffer *sb_bufs; /* The array of housekeeping structs */
162 struct list_head sb_avail; /* Available for data (we own) (dev_lock) */
163 struct list_head sb_full; /* With data (user space owns) (dev_lock) */
164 struct tasklet_struct s_tasklet;
165
166 /* Current operating parameters */
167 enum v4l2_chip_ident sensor_type; /* Currently ov7670 only */
168 struct v4l2_pix_format pix_format;
169
170 /* Locks */
171 struct mutex s_mutex; /* Access to this structure */
172 spinlock_t dev_lock; /* Access to device */
173
174 /* Misc */
175 wait_queue_head_t smbus_wait; /* Waiting on i2c events */
176 wait_queue_head_t iowait; /* Waiting on frame data */
177#ifdef CONFIG_VIDEO_ADV_DEBUG
178 struct dentry *dfs_regs;
179 struct dentry *dfs_cam_regs;
180#endif
181};
182
183/*
184 * Status flags. Always manipulated with bit operations.
185 */
186#define CF_BUF0_VALID 0 /* Buffers valid - first three */
187#define CF_BUF1_VALID 1
188#define CF_BUF2_VALID 2
189#define CF_DMA_ACTIVE 3 /* A frame is incoming */
190#define CF_CONFIG_NEEDED 4 /* Must configure hardware */
191
192
193
194/*
195 * Start over with DMA buffers - dev_lock needed.
196 */
197static void cafe_reset_buffers(struct cafe_camera *cam)
198{
199 int i;
200
201 cam->next_buf = -1;
202 for (i = 0; i < cam->nbufs; i++)
203 clear_bit(i, &cam->flags);
204 cam->specframes = 0;
205}
206
207static inline int cafe_needs_config(struct cafe_camera *cam)
208{
209 return test_bit(CF_CONFIG_NEEDED, &cam->flags);
210}
211
212static void cafe_set_config_needed(struct cafe_camera *cam, int needed)
213{
214 if (needed)
215 set_bit(CF_CONFIG_NEEDED, &cam->flags);
216 else
217 clear_bit(CF_CONFIG_NEEDED, &cam->flags);
218}
219
220
221
222
223/*
224 * Debugging and related.
225 */
226#define cam_err(cam, fmt, arg...) \
227 dev_err(&(cam)->pdev->dev, fmt, ##arg);
228#define cam_warn(cam, fmt, arg...) \
229 dev_warn(&(cam)->pdev->dev, fmt, ##arg);
230#define cam_dbg(cam, fmt, arg...) \
231 dev_dbg(&(cam)->pdev->dev, fmt, ##arg);
232
233
234/* ---------------------------------------------------------------------*/
235/*
236 * We keep a simple list of known devices to search at open time.
237 */
238static LIST_HEAD(cafe_dev_list);
239static DEFINE_MUTEX(cafe_dev_list_lock);
240
241static void cafe_add_dev(struct cafe_camera *cam)
242{
243 mutex_lock(&cafe_dev_list_lock);
244 list_add_tail(&cam->dev_list, &cafe_dev_list);
245 mutex_unlock(&cafe_dev_list_lock);
246}
247
248static void cafe_remove_dev(struct cafe_camera *cam)
249{
250 mutex_lock(&cafe_dev_list_lock);
251 list_del(&cam->dev_list);
252 mutex_unlock(&cafe_dev_list_lock);
253}
254
255static struct cafe_camera *cafe_find_dev(int minor)
256{
257 struct cafe_camera *cam;
258
259 mutex_lock(&cafe_dev_list_lock);
260 list_for_each_entry(cam, &cafe_dev_list, dev_list) {
261 if (cam->v4ldev.minor == minor)
262 goto done;
263 }
264 cam = NULL;
265 done:
266 mutex_unlock(&cafe_dev_list_lock);
267 return cam;
268}
269
270
271static struct cafe_camera *cafe_find_by_pdev(struct pci_dev *pdev)
272{
273 struct cafe_camera *cam;
274
275 mutex_lock(&cafe_dev_list_lock);
276 list_for_each_entry(cam, &cafe_dev_list, dev_list) {
277 if (cam->pdev == pdev)
278 goto done;
279 }
280 cam = NULL;
281 done:
282 mutex_unlock(&cafe_dev_list_lock);
283 return cam;
284}
285
286
287/* ------------------------------------------------------------------------ */
288/*
289 * Device register I/O
290 */
291static inline void cafe_reg_write(struct cafe_camera *cam, unsigned int reg,
292 unsigned int val)
293{
294 iowrite32(val, cam->regs + reg);
295}
296
297static inline unsigned int cafe_reg_read(struct cafe_camera *cam,
298 unsigned int reg)
299{
300 return ioread32(cam->regs + reg);
301}
302
303
304static inline void cafe_reg_write_mask(struct cafe_camera *cam, unsigned int reg,
305 unsigned int val, unsigned int mask)
306{
307 unsigned int v = cafe_reg_read(cam, reg);
308
309 v = (v & ~mask) | (val & mask);
310 cafe_reg_write(cam, reg, v);
311}
312
313static inline void cafe_reg_clear_bit(struct cafe_camera *cam,
314 unsigned int reg, unsigned int val)
315{
316 cafe_reg_write_mask(cam, reg, 0, val);
317}
318
319static inline void cafe_reg_set_bit(struct cafe_camera *cam,
320 unsigned int reg, unsigned int val)
321{
322 cafe_reg_write_mask(cam, reg, val, val);
323}
324
325
326
327/* -------------------------------------------------------------------- */
328/*
329 * The I2C/SMBUS interface to the camera itself starts here. The
330 * controller handles SMBUS itself, presenting a relatively simple register
331 * interface; all we have to do is to tell it where to route the data.
332 */
333#define CAFE_SMBUS_TIMEOUT (HZ) /* generous */
334
335static int cafe_smbus_write_done(struct cafe_camera *cam)
336{
337 unsigned long flags;
338 int c1;
339
340 /*
341 * We must delay after the interrupt, or the controller gets confused
342 * and never does give us good status. Fortunately, we don't do this
343 * often.
344 */
345 udelay(20);
346 spin_lock_irqsave(&cam->dev_lock, flags);
347 c1 = cafe_reg_read(cam, REG_TWSIC1);
348 spin_unlock_irqrestore(&cam->dev_lock, flags);
349 return (c1 & (TWSIC1_WSTAT|TWSIC1_ERROR)) != TWSIC1_WSTAT;
350}
351
352static int cafe_smbus_write_data(struct cafe_camera *cam,
353 u16 addr, u8 command, u8 value)
354{
355 unsigned int rval;
356 unsigned long flags;
357
358 spin_lock_irqsave(&cam->dev_lock, flags);
359 rval = TWSIC0_EN | ((addr << TWSIC0_SID_SHIFT) & TWSIC0_SID);
360 rval |= TWSIC0_OVMAGIC; /* Make OV sensors work */
361 /*
362 * Marvell sez set clkdiv to all 1's for now.
363 */
364 rval |= TWSIC0_CLKDIV;
365 cafe_reg_write(cam, REG_TWSIC0, rval);
366 (void) cafe_reg_read(cam, REG_TWSIC1); /* force write */
367 rval = value | ((command << TWSIC1_ADDR_SHIFT) & TWSIC1_ADDR);
368 cafe_reg_write(cam, REG_TWSIC1, rval);
369 spin_unlock_irqrestore(&cam->dev_lock, flags);
370 msleep(2); /* Required or things flake */
371
372 wait_event_timeout(cam->smbus_wait, cafe_smbus_write_done(cam),
373 CAFE_SMBUS_TIMEOUT);
374 spin_lock_irqsave(&cam->dev_lock, flags);
375 rval = cafe_reg_read(cam, REG_TWSIC1);
376 spin_unlock_irqrestore(&cam->dev_lock, flags);
377
378 if (rval & TWSIC1_WSTAT) {
379 cam_err(cam, "SMBUS write (%02x/%02x/%02x) timed out\n", addr,
380 command, value);
381 return -EIO;
382 }
383 if (rval & TWSIC1_ERROR) {
384 cam_err(cam, "SMBUS write (%02x/%02x/%02x) error\n", addr,
385 command, value);
386 return -EIO;
387 }
388 return 0;
389}
390
391
392
393static int cafe_smbus_read_done(struct cafe_camera *cam)
394{
395 unsigned long flags;
396 int c1;
397
398 /*
399 * We must delay after the interrupt, or the controller gets confused
400 * and never does give us good status. Fortunately, we don't do this
401 * often.
402 */
403 udelay(20);
404 spin_lock_irqsave(&cam->dev_lock, flags);
405 c1 = cafe_reg_read(cam, REG_TWSIC1);
406 spin_unlock_irqrestore(&cam->dev_lock, flags);
407 return c1 & (TWSIC1_RVALID|TWSIC1_ERROR);
408}
409
410
411
412static int cafe_smbus_read_data(struct cafe_camera *cam,
413 u16 addr, u8 command, u8 *value)
414{
415 unsigned int rval;
416 unsigned long flags;
417
418 spin_lock_irqsave(&cam->dev_lock, flags);
419 rval = TWSIC0_EN | ((addr << TWSIC0_SID_SHIFT) & TWSIC0_SID);
420 rval |= TWSIC0_OVMAGIC; /* Make OV sensors work */
421 /*
422 * Marvel sez set clkdiv to all 1's for now.
423 */
424 rval |= TWSIC0_CLKDIV;
425 cafe_reg_write(cam, REG_TWSIC0, rval);
426 (void) cafe_reg_read(cam, REG_TWSIC1); /* force write */
427 rval = TWSIC1_READ | ((command << TWSIC1_ADDR_SHIFT) & TWSIC1_ADDR);
428 cafe_reg_write(cam, REG_TWSIC1, rval);
429 spin_unlock_irqrestore(&cam->dev_lock, flags);
430
431 wait_event_timeout(cam->smbus_wait,
432 cafe_smbus_read_done(cam), CAFE_SMBUS_TIMEOUT);
433 spin_lock_irqsave(&cam->dev_lock, flags);
434 rval = cafe_reg_read(cam, REG_TWSIC1);
435 spin_unlock_irqrestore(&cam->dev_lock, flags);
436
437 if (rval & TWSIC1_ERROR) {
438 cam_err(cam, "SMBUS read (%02x/%02x) error\n", addr, command);
439 return -EIO;
440 }
441 if (! (rval & TWSIC1_RVALID)) {
442 cam_err(cam, "SMBUS read (%02x/%02x) timed out\n", addr,
443 command);
444 return -EIO;
445 }
446 *value = rval & 0xff;
447 return 0;
448}
449
450/*
451 * Perform a transfer over SMBUS. This thing is called under
452 * the i2c bus lock, so we shouldn't race with ourselves...
453 */
454static int cafe_smbus_xfer(struct i2c_adapter *adapter, u16 addr,
455 unsigned short flags, char rw, u8 command,
456 int size, union i2c_smbus_data *data)
457{
458 struct cafe_camera *cam = i2c_get_adapdata(adapter);
459 int ret = -EINVAL;
460
461 /*
462 * Refuse to talk to anything but OV cam chips. We should
463 * never even see an attempt to do so, but one never knows.
464 */
465 if (cam->sensor && addr != cam->sensor->addr) {
466 cam_err(cam, "funky smbus addr %d\n", addr);
467 return -EINVAL;
468 }
469 /*
470 * This interface would appear to only do byte data ops. OK
471 * it can do word too, but the cam chip has no use for that.
472 */
473 if (size != I2C_SMBUS_BYTE_DATA) {
474 cam_err(cam, "funky xfer size %d\n", size);
475 return -EINVAL;
476 }
477
478 if (rw == I2C_SMBUS_WRITE)
479 ret = cafe_smbus_write_data(cam, addr, command, data->byte);
480 else if (rw == I2C_SMBUS_READ)
481 ret = cafe_smbus_read_data(cam, addr, command, &data->byte);
482 return ret;
483}
484
485
486static void cafe_smbus_enable_irq(struct cafe_camera *cam)
487{
488 unsigned long flags;
489
490 spin_lock_irqsave(&cam->dev_lock, flags);
491 cafe_reg_set_bit(cam, REG_IRQMASK, TWSIIRQS);
492 spin_unlock_irqrestore(&cam->dev_lock, flags);
493}
494
495static u32 cafe_smbus_func(struct i2c_adapter *adapter)
496{
497 return I2C_FUNC_SMBUS_READ_BYTE_DATA |
498 I2C_FUNC_SMBUS_WRITE_BYTE_DATA;
499}
500
501static struct i2c_algorithm cafe_smbus_algo = {
502 .smbus_xfer = cafe_smbus_xfer,
503 .functionality = cafe_smbus_func
504};
505
506/* Somebody is on the bus */
507static int cafe_cam_init(struct cafe_camera *cam);
508
509static int cafe_smbus_attach(struct i2c_client *client)
510{
511 struct cafe_camera *cam = i2c_get_adapdata(client->adapter);
512
513 /*
514 * Don't talk to chips we don't recognize.
515 */
516 cam_err(cam, "smbus_attach id = %d\n", client->driver->id);
517 if (client->driver->id == I2C_DRIVERID_OV7670) {
518 cam->sensor = client;
519 return cafe_cam_init(cam);
520 }
521 return -EINVAL;
522}
523
524static int cafe_smbus_detach(struct i2c_client *client)
525{
526 struct cafe_camera *cam = i2c_get_adapdata(client->adapter);
527
528 if (cam->sensor == client)
529 cam->sensor = NULL; /* Bummer, no camera */
530 return 0;
531}
532
533static int cafe_smbus_setup(struct cafe_camera *cam)
534{
535 struct i2c_adapter *adap = &cam->i2c_adapter;
536 int ret;
537
538 cafe_smbus_enable_irq(cam);
539 adap->id = I2C_HW_SMBUS_CAFE;
540 adap->class = I2C_CLASS_CAM_DIGITAL;
541 adap->owner = THIS_MODULE;
542 adap->client_register = cafe_smbus_attach;
543 adap->client_unregister = cafe_smbus_detach;
544 adap->algo = &cafe_smbus_algo;
545 strcpy(adap->name, "cafe_ccic");
546 i2c_set_adapdata(adap, cam);
547 ret = i2c_add_adapter(adap);
548 if (ret)
549 printk(KERN_ERR "Unable to register cafe i2c adapter\n");
550 return ret;
551}
552
553static void cafe_smbus_shutdown(struct cafe_camera *cam)
554{
555 i2c_del_adapter(&cam->i2c_adapter);
556}
557
558
559/* ------------------------------------------------------------------- */
560/*
561 * Deal with the controller.
562 */
563
564/*
565 * Do everything we think we need to have the interface operating
566 * according to the desired format.
567 */
568static void cafe_ctlr_dma(struct cafe_camera *cam)
569{
570 /*
571 * Store the first two Y buffers (we aren't supporting
572 * planar formats for now, so no UV bufs). Then either
573 * set the third if it exists, or tell the controller
574 * to just use two.
575 */
576 cafe_reg_write(cam, REG_Y0BAR, cam->dma_handles[0]);
577 cafe_reg_write(cam, REG_Y1BAR, cam->dma_handles[1]);
578 if (cam->nbufs > 2) {
579 cafe_reg_write(cam, REG_Y2BAR, cam->dma_handles[2]);
580 cafe_reg_clear_bit(cam, REG_CTRL1, C1_TWOBUFS);
581 }
582 else
583 cafe_reg_set_bit(cam, REG_CTRL1, C1_TWOBUFS);
584 cafe_reg_write(cam, REG_UBAR, 0); /* 32 bits only for now */
585}
586
587static void cafe_ctlr_image(struct cafe_camera *cam)
588{
589 int imgsz;
590 struct v4l2_pix_format *fmt = &cam->pix_format;
591
592 imgsz = ((fmt->height << IMGSZ_V_SHIFT) & IMGSZ_V_MASK) |
593 (fmt->bytesperline & IMGSZ_H_MASK);
594 cafe_reg_write(cam, REG_IMGSIZE, imgsz);
595 cafe_reg_write(cam, REG_IMGOFFSET, 0);
596 /* YPITCH just drops the last two bits */
597 cafe_reg_write_mask(cam, REG_IMGPITCH, fmt->bytesperline,
598 IMGP_YP_MASK);
599 /*
600 * Tell the controller about the image format we are using.
601 */
602 switch (cam->pix_format.pixelformat) {
603 case V4L2_PIX_FMT_YUYV:
604 cafe_reg_write_mask(cam, REG_CTRL0,
605 C0_DF_YUV|C0_YUV_PACKED|C0_YUVE_YUYV,
606 C0_DF_MASK);
607 break;
608
609 /*
610 * For "fake rgb32" get the image pitch right.
611 */
612 case V4L2_PIX_FMT_RGB32:
613 cafe_reg_write_mask(cam, REG_IMGPITCH, fmt->bytesperline/2,
614 IMGP_YP_MASK);
615 imgsz = ((fmt->height << IMGSZ_V_SHIFT) & IMGSZ_V_MASK) |
616 ((fmt->bytesperline/2) & IMGSZ_H_MASK);
617 cafe_reg_write(cam, REG_IMGSIZE, imgsz);
618 /* fall into ... */
619 case V4L2_PIX_FMT_RGB444:
620 cafe_reg_write_mask(cam, REG_CTRL0,
621 C0_DF_RGB|C0_RGBF_444|C0_RGB4_XRGB,
622 C0_DF_MASK);
623 /* Alpha value? */
624 break;
625
626 case V4L2_PIX_FMT_RGB565:
627 cafe_reg_write_mask(cam, REG_CTRL0,
628 C0_DF_RGB|C0_RGBF_565|C0_RGB5_BGGR,
629 C0_DF_MASK);
630 break;
631
632 default:
633 cam_err(cam, "Unknown format %x\n", cam->pix_format.pixelformat);
634 break;
635 }
636 /*
637 * Make sure it knows we want to use hsync/vsync.
638 */
639 cafe_reg_write_mask(cam, REG_CTRL0, C0_SIF_HVSYNC,
640 C0_SIFM_MASK);
641}
642
643
644/*
645 * Configure the controller for operation; caller holds the
646 * device mutex.
647 */
648static int cafe_ctlr_configure(struct cafe_camera *cam)
649{
650 unsigned long flags;
651
652 spin_lock_irqsave(&cam->dev_lock, flags);
653 cafe_ctlr_dma(cam);
654 cafe_ctlr_image(cam);
655 cafe_set_config_needed(cam, 0);
656 spin_unlock_irqrestore(&cam->dev_lock, flags);
657 return 0;
658}
659
660static void cafe_ctlr_irq_enable(struct cafe_camera *cam)
661{
662 /*
663 * Clear any pending interrupts, since we do not
664 * expect to have I/O active prior to enabling.
665 */
666 cafe_reg_write(cam, REG_IRQSTAT, FRAMEIRQS);
667 cafe_reg_set_bit(cam, REG_IRQMASK, FRAMEIRQS);
668}
669
670static void cafe_ctlr_irq_disable(struct cafe_camera *cam)
671{
672 cafe_reg_clear_bit(cam, REG_IRQMASK, FRAMEIRQS);
673}
674
675/*
676 * Make the controller start grabbing images. Everything must
677 * be set up before doing this.
678 */
679static void cafe_ctlr_start(struct cafe_camera *cam)
680{
681 /* set_bit performs a read, so no other barrier should be
682 needed here */
683 cafe_reg_set_bit(cam, REG_CTRL0, C0_ENABLE);
684}
685
686static void cafe_ctlr_stop(struct cafe_camera *cam)
687{
688 cafe_reg_clear_bit(cam, REG_CTRL0, C0_ENABLE);
689}
690
691static void cafe_ctlr_init(struct cafe_camera *cam)
692{
693 unsigned long flags;
694
695 spin_lock_irqsave(&cam->dev_lock, flags);
696 /*
697 * Added magic to bring up the hardware on the B-Test board
698 */
699 cafe_reg_write(cam, 0x3038, 0x8);
700 cafe_reg_write(cam, 0x315c, 0x80008);
701 /*
702 * Go through the dance needed to wake the device up.
703 * Note that these registers are global and shared
704 * with the NAND and SD devices. Interaction between the
705 * three still needs to be examined.
706 */
707 cafe_reg_write(cam, REG_GL_CSR, GCSR_SRS|GCSR_MRS); /* Needed? */
708 cafe_reg_write(cam, REG_GL_CSR, GCSR_SRC|GCSR_MRC);
709 cafe_reg_write(cam, REG_GL_CSR, GCSR_SRC|GCSR_MRS);
710 mdelay(5); /* FIXME revisit this */
711 cafe_reg_write(cam, REG_GL_CSR, GCSR_CCIC_EN|GCSR_SRC|GCSR_MRC);
712 cafe_reg_set_bit(cam, REG_GL_IMASK, GIMSK_CCIC_EN);
713 /*
714 * Make sure it's not powered down.
715 */
716 cafe_reg_clear_bit(cam, REG_CTRL1, C1_PWRDWN);
717 /*
718 * Turn off the enable bit. It sure should be off anyway,
719 * but it's good to be sure.
720 */
721 cafe_reg_clear_bit(cam, REG_CTRL0, C0_ENABLE);
722 /*
723 * Mask all interrupts.
724 */
725 cafe_reg_write(cam, REG_IRQMASK, 0);
726 /*
727 * Clock the sensor appropriately. Controller clock should
728 * be 48MHz, sensor "typical" value is half that.
729 */
730 cafe_reg_write_mask(cam, REG_CLKCTRL, 2, CLK_DIV_MASK);
731 spin_unlock_irqrestore(&cam->dev_lock, flags);
732}
733
734
735/*
736 * Stop the controller, and don't return until we're really sure that no
737 * further DMA is going on.
738 */
739static void cafe_ctlr_stop_dma(struct cafe_camera *cam)
740{
741 unsigned long flags;
742
743 /*
744 * Theory: stop the camera controller (whether it is operating
745 * or not). Delay briefly just in case we race with the SOF
746 * interrupt, then wait until no DMA is active.
747 */
748 spin_lock_irqsave(&cam->dev_lock, flags);
749 cafe_ctlr_stop(cam);
750 spin_unlock_irqrestore(&cam->dev_lock, flags);
751 mdelay(1);
752 wait_event_timeout(cam->iowait,
753 !test_bit(CF_DMA_ACTIVE, &cam->flags), HZ);
754 if (test_bit(CF_DMA_ACTIVE, &cam->flags))
755 cam_err(cam, "Timeout waiting for DMA to end\n");
756 /* This would be bad news - what now? */
757 spin_lock_irqsave(&cam->dev_lock, flags);
758 cam->state = S_IDLE;
759 cafe_ctlr_irq_disable(cam);
760 spin_unlock_irqrestore(&cam->dev_lock, flags);
761}
762
763/*
764 * Power up and down.
765 */
766static void cafe_ctlr_power_up(struct cafe_camera *cam)
767{
768 unsigned long flags;
769
770 spin_lock_irqsave(&cam->dev_lock, flags);
771 cafe_reg_clear_bit(cam, REG_CTRL1, C1_PWRDWN);
772 /*
773 * Put the sensor into operational mode (assumes OLPC-style
774 * wiring). Control 0 is reset - set to 1 to operate.
775 * Control 1 is power down, set to 0 to operate.
776 */
777 cafe_reg_write(cam, REG_GPR, GPR_C1EN|GPR_C0EN|GPR_C1);
778 mdelay(1); /* Marvell says 1ms will do it */
779 cafe_reg_write(cam, REG_GPR, GPR_C1EN|GPR_C0EN|GPR_C0);
780 mdelay(1); /* Enough? */
781 spin_unlock_irqrestore(&cam->dev_lock, flags);
782}
783
784static void cafe_ctlr_power_down(struct cafe_camera *cam)
785{
786 unsigned long flags;
787
788 spin_lock_irqsave(&cam->dev_lock, flags);
789 cafe_reg_write(cam, REG_GPR, GPR_C1EN|GPR_C0EN|GPR_C1);
790 cafe_reg_set_bit(cam, REG_CTRL1, C1_PWRDWN);
791 spin_unlock_irqrestore(&cam->dev_lock, flags);
792}
793
794/* -------------------------------------------------------------------- */
795/*
796 * Communications with the sensor.
797 */
798
799static int __cafe_cam_cmd(struct cafe_camera *cam, int cmd, void *arg)
800{
801 struct i2c_client *sc = cam->sensor;
802 int ret;
803
804 if (sc == NULL || sc->driver == NULL || sc->driver->command == NULL)
805 return -EINVAL;
806 ret = sc->driver->command(sc, cmd, arg);
807 if (ret == -EPERM) /* Unsupported command */
808 return 0;
809 return ret;
810}
811
812static int __cafe_cam_reset(struct cafe_camera *cam)
813{
814 int zero = 0;
815 return __cafe_cam_cmd(cam, VIDIOC_INT_RESET, &zero);
816}
817
818/*
819 * We have found the sensor on the i2c. Let's try to have a
820 * conversation.
821 */
822static int cafe_cam_init(struct cafe_camera *cam)
823{
824 int ret;
825
826 mutex_lock(&cam->s_mutex);
827 if (cam->state != S_NOTREADY)
828 cam_warn(cam, "Cam init with device in funky state %d",
829 cam->state);
830 ret = __cafe_cam_reset(cam);
831 if (ret)
832 goto out;
833 ret = __cafe_cam_cmd(cam, VIDIOC_INT_G_CHIP_IDENT, &cam->sensor_type);
834 if (ret)
835 goto out;
836// if (cam->sensor->addr != OV7xx0_SID) {
837 if (cam->sensor_type != V4L2_IDENT_OV7670) {
838 cam_err(cam, "Unsupported sensor type %d", cam->sensor->addr);
839 ret = -EINVAL;
840 goto out;
841 }
842/* Get/set parameters? */
843 ret = 0;
844 cam->state = S_IDLE;
845 out:
846 mutex_unlock(&cam->s_mutex);
847 return ret;
848}
849
850/*
851 * Configure the sensor to match the parameters we have. Caller should
852 * hold s_mutex
853 */
854static int cafe_cam_set_flip(struct cafe_camera *cam)
855{
856 struct v4l2_control ctrl;
857
858 memset(&ctrl, 0, sizeof(ctrl));
859 ctrl.id = V4L2_CID_VFLIP;
860 ctrl.value = flip;
861 return __cafe_cam_cmd(cam, VIDIOC_S_CTRL, &ctrl);
862}
863
864
865static int cafe_cam_configure(struct cafe_camera *cam)
866{
867 struct v4l2_format fmt;
868 int ret, zero = 0;
869
870 if (cam->state != S_IDLE)
871 return -EINVAL;
872 fmt.fmt.pix = cam->pix_format;
873 ret = __cafe_cam_cmd(cam, VIDIOC_INT_INIT, &zero);
874 if (ret == 0)
875 ret = __cafe_cam_cmd(cam, VIDIOC_S_FMT, &fmt);
876 /*
877 * OV7670 does weird things if flip is set *before* format...
878 */
879 ret += cafe_cam_set_flip(cam);
880 return ret;
881}
882
883/* -------------------------------------------------------------------- */
884/*
885 * DMA buffer management. These functions need s_mutex held.
886 */
887
888/* FIXME: this is inefficient as hell, since dma_alloc_coherent just
889 * does a get_free_pages() call, and we waste a good chunk of an orderN
890 * allocation. Should try to allocate the whole set in one chunk.
891 */
892static int cafe_alloc_dma_bufs(struct cafe_camera *cam, int loadtime)
893{
894 int i;
895
896 cafe_set_config_needed(cam, 1);
897 if (loadtime)
898 cam->dma_buf_size = dma_buf_size;
899 else {
900 cam->dma_buf_size = cam->pix_format.sizeimage;
901 if (cam->pix_format.pixelformat == V4L2_PIX_FMT_RGB32)
902 cam->dma_buf_size /= 2;
903 }
904 if (n_dma_bufs > 3)
905 n_dma_bufs = 3;
906
907 cam->nbufs = 0;
908 for (i = 0; i < n_dma_bufs; i++) {
909 cam->dma_bufs[i] = dma_alloc_coherent(&cam->pdev->dev,
910 cam->dma_buf_size, cam->dma_handles + i,
911 GFP_KERNEL);
912 if (cam->dma_bufs[i] == NULL) {
913 cam_warn(cam, "Failed to allocate DMA buffer\n");
914 break;
915 }
916 /* For debug, remove eventually */
917 memset(cam->dma_bufs[i], 0xcc, cam->dma_buf_size);
918 (cam->nbufs)++;
919 }
920
921 switch (cam->nbufs) {
922 case 1:
923 dma_free_coherent(&cam->pdev->dev, cam->dma_buf_size,
924 cam->dma_bufs[0], cam->dma_handles[0]);
925 cam->nbufs = 0;
926 case 0:
927 cam_err(cam, "Insufficient DMA buffers, cannot operate\n");
928 return -ENOMEM;
929
930 case 2:
931 if (n_dma_bufs > 2)
932 cam_warn(cam, "Will limp along with only 2 buffers\n");
933 break;
934 }
935 return 0;
936}
937
938static void cafe_free_dma_bufs(struct cafe_camera *cam)
939{
940 int i;
941
942 for (i = 0; i < cam->nbufs; i++) {
943 dma_free_coherent(&cam->pdev->dev, cam->dma_buf_size,
944 cam->dma_bufs[i], cam->dma_handles[i]);
945 cam->dma_bufs[i] = NULL;
946 }
947 cam->nbufs = 0;
948}
949
950
951
952
953
954/* ----------------------------------------------------------------------- */
955/*
956 * Here starts the V4L2 interface code.
957 */
958
959/*
960 * Read an image from the device.
961 */
962static ssize_t cafe_deliver_buffer(struct cafe_camera *cam,
963 char __user *buffer, size_t len, loff_t *pos)
964{
965 int bufno;
966 unsigned long flags;
967
968 spin_lock_irqsave(&cam->dev_lock, flags);
969 if (cam->next_buf < 0) {
970 cam_err(cam, "deliver_buffer: No next buffer\n");
971 spin_unlock_irqrestore(&cam->dev_lock, flags);
972 return -EIO;
973 }
974 bufno = cam->next_buf;
975 clear_bit(bufno, &cam->flags);
976 if (++(cam->next_buf) >= cam->nbufs)
977 cam->next_buf = 0;
978 if (! test_bit(cam->next_buf, &cam->flags))
979 cam->next_buf = -1;
980 cam->specframes = 0;
981 spin_unlock_irqrestore(&cam->dev_lock, flags);
982
983 if (len > cam->pix_format.sizeimage)
984 len = cam->pix_format.sizeimage;
985 if (copy_to_user(buffer, cam->dma_bufs[bufno], len))
986 return -EFAULT;
987 (*pos) += len;
988 return len;
989}
990
991/*
992 * Get everything ready, and start grabbing frames.
993 */
994static int cafe_read_setup(struct cafe_camera *cam, enum cafe_state state)
995{
996 int ret;
997 unsigned long flags;
998
999 /*
1000 * Configuration. If we still don't have DMA buffers,
1001 * make one last, desperate attempt.
1002 */
1003 if (cam->nbufs == 0)
1004 if (cafe_alloc_dma_bufs(cam, 0))
1005 return -ENOMEM;
1006
1007 if (cafe_needs_config(cam)) {
1008 cafe_cam_configure(cam);
1009 ret = cafe_ctlr_configure(cam);
1010 if (ret)
1011 return ret;
1012 }
1013
1014 /*
1015 * Turn it loose.
1016 */
1017 spin_lock_irqsave(&cam->dev_lock, flags);
1018 cafe_reset_buffers(cam);
1019 cafe_ctlr_irq_enable(cam);
1020 cam->state = state;
1021 cafe_ctlr_start(cam);
1022 spin_unlock_irqrestore(&cam->dev_lock, flags);
1023 return 0;
1024}
1025
1026
1027static ssize_t cafe_v4l_read(struct file *filp,
1028 char __user *buffer, size_t len, loff_t *pos)
1029{
1030 struct cafe_camera *cam = filp->private_data;
1031 int ret;
1032
1033 /*
1034 * Perhaps we're in speculative read mode and already
1035 * have data?
1036 */
1037 mutex_lock(&cam->s_mutex);
1038 if (cam->state == S_SPECREAD) {
1039 if (cam->next_buf >= 0) {
1040 ret = cafe_deliver_buffer(cam, buffer, len, pos);
1041 if (ret != 0)
1042 goto out_unlock;
1043 }
1044 } else if (cam->state == S_FLAKED || cam->state == S_NOTREADY) {
1045 ret = -EIO;
1046 goto out_unlock;
1047 } else if (cam->state != S_IDLE) {
1048 ret = -EBUSY;
1049 goto out_unlock;
1050 }
1051
1052 /*
1053 * v4l2: multiple processes can open the device, but only
1054 * one gets to grab data from it.
1055 */
1056 if (cam->owner && cam->owner != filp) {
1057 ret = -EBUSY;
1058 goto out_unlock;
1059 }
1060 cam->owner = filp;
1061
1062 /*
1063 * Do setup if need be.
1064 */
1065 if (cam->state != S_SPECREAD) {
1066 ret = cafe_read_setup(cam, S_SINGLEREAD);
1067 if (ret)
1068 goto out_unlock;
1069 }
1070 /*
1071 * Wait for something to happen. This should probably
1072 * be interruptible (FIXME).
1073 */
1074 wait_event_timeout(cam->iowait, cam->next_buf >= 0, HZ);
1075 if (cam->next_buf < 0) {
1076 cam_err(cam, "read() operation timed out\n");
1077 cafe_ctlr_stop_dma(cam);
1078 ret = -EIO;
1079 goto out_unlock;
1080 }
1081 /*
1082 * Give them their data and we should be done.
1083 */
1084 ret = cafe_deliver_buffer(cam, buffer, len, pos);
1085
1086 out_unlock:
1087 mutex_unlock(&cam->s_mutex);
1088 return ret;
1089}
1090
1091
1092
1093
1094
1095
1096
1097
1098/*
1099 * Streaming I/O support.
1100 */
1101
1102
1103
1104static int cafe_vidioc_streamon(struct file *filp, void *priv,
1105 enum v4l2_buf_type type)
1106{
1107 struct cafe_camera *cam = filp->private_data;
1108 int ret = -EINVAL;
1109
1110 if (type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1111 goto out;
1112 mutex_lock(&cam->s_mutex);
1113 if (cam->state != S_IDLE || cam->n_sbufs == 0)
1114 goto out_unlock;
1115
1116 cam->sequence = 0;
1117 ret = cafe_read_setup(cam, S_STREAMING);
1118
1119 out_unlock:
1120 mutex_unlock(&cam->s_mutex);
1121 out:
1122 return ret;
1123}
1124
1125
1126static int cafe_vidioc_streamoff(struct file *filp, void *priv,
1127 enum v4l2_buf_type type)
1128{
1129 struct cafe_camera *cam = filp->private_data;
1130 int ret = -EINVAL;
1131
1132 if (type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1133 goto out;
1134 mutex_lock(&cam->s_mutex);
1135 if (cam->state != S_STREAMING)
1136 goto out_unlock;
1137
1138 cafe_ctlr_stop_dma(cam);
1139 ret = 0;
1140
1141 out_unlock:
1142 mutex_unlock(&cam->s_mutex);
1143 out:
1144 return ret;
1145}
1146
1147
1148
1149static int cafe_setup_siobuf(struct cafe_camera *cam, int index)
1150{
1151 struct cafe_sio_buffer *buf = cam->sb_bufs + index;
1152
1153 INIT_LIST_HEAD(&buf->list);
1154 buf->v4lbuf.length = PAGE_ALIGN(cam->pix_format.sizeimage);
1155 buf->buffer = vmalloc_user(buf->v4lbuf.length);
1156 if (buf->buffer == NULL)
1157 return -ENOMEM;
1158 buf->mapcount = 0;
1159 buf->cam = cam;
1160
1161 buf->v4lbuf.index = index;
1162 buf->v4lbuf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1163 buf->v4lbuf.field = V4L2_FIELD_NONE;
1164 buf->v4lbuf.memory = V4L2_MEMORY_MMAP;
1165 /*
1166 * Offset: must be 32-bit even on a 64-bit system. video-buf
1167 * just uses the length times the index, but the spec warns
1168 * against doing just that - vma merging problems. So we
1169 * leave a gap between each pair of buffers.
1170 */
1171 buf->v4lbuf.m.offset = 2*index*buf->v4lbuf.length;
1172 return 0;
1173}
1174
1175static int cafe_free_sio_buffers(struct cafe_camera *cam)
1176{
1177 int i;
1178
1179 /*
1180 * If any buffers are mapped, we cannot free them at all.
1181 */
1182 for (i = 0; i < cam->n_sbufs; i++)
1183 if (cam->sb_bufs[i].mapcount > 0)
1184 return -EBUSY;
1185 /*
1186 * OK, let's do it.
1187 */
1188 for (i = 0; i < cam->n_sbufs; i++)
1189 vfree(cam->sb_bufs[i].buffer);
1190 cam->n_sbufs = 0;
1191 kfree(cam->sb_bufs);
1192 cam->sb_bufs = NULL;
1193 INIT_LIST_HEAD(&cam->sb_avail);
1194 INIT_LIST_HEAD(&cam->sb_full);
1195 return 0;
1196}
1197
1198
1199
1200static int cafe_vidioc_reqbufs(struct file *filp, void *priv,
1201 struct v4l2_requestbuffers *req)
1202{
1203 struct cafe_camera *cam = filp->private_data;
1204 int ret;
1205
1206 /*
1207 * Make sure it's something we can do. User pointers could be
1208 * implemented without great pain, but that's not been done yet.
1209 */
1210 if (req->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1211 return -EINVAL;
1212 if (req->memory != V4L2_MEMORY_MMAP)
1213 return -EINVAL;
1214 /*
1215 * If they ask for zero buffers, they really want us to stop streaming
1216 * (if it's happening) and free everything. Should we check owner?
1217 */
1218 mutex_lock(&cam->s_mutex);
1219 if (req->count == 0) {
1220 if (cam->state == S_STREAMING)
1221 cafe_ctlr_stop_dma(cam);
1222 ret = cafe_free_sio_buffers (cam);
1223 goto out;
1224 }
1225 /*
1226 * Device needs to be idle and working. We *could* try to do the
1227 * right thing in S_SPECREAD by shutting things down, but it
1228 * probably doesn't matter.
1229 */
1230 if (cam->state != S_IDLE || (cam->owner && cam->owner != filp)) {
1231 ret = -EBUSY;
1232 goto out;
1233 }
1234 cam->owner = filp;
1235
1236 if (req->count < min_buffers)
1237 req->count = min_buffers;
1238 else if (req->count > max_buffers)
1239 req->count = max_buffers;
1240 if (cam->n_sbufs > 0) {
1241 ret = cafe_free_sio_buffers(cam);
1242 if (ret)
1243 goto out;
1244 }
1245
1246 cam->sb_bufs = kzalloc(req->count*sizeof(struct cafe_sio_buffer),
1247 GFP_KERNEL);
1248 if (cam->sb_bufs == NULL) {
1249 ret = -ENOMEM;
1250 goto out;
1251 }
1252 for (cam->n_sbufs = 0; cam->n_sbufs < req->count; (cam->n_sbufs++)) {
1253 ret = cafe_setup_siobuf(cam, cam->n_sbufs);
1254 if (ret)
1255 break;
1256 }
1257
1258 if (cam->n_sbufs == 0) /* no luck at all - ret already set */
1259 kfree(cam->sb_bufs);
1260 else
1261 ret = 0;
1262 req->count = cam->n_sbufs; /* In case of partial success */
1263
1264 out:
1265 mutex_unlock(&cam->s_mutex);
1266 return ret;
1267}
1268
1269
1270static int cafe_vidioc_querybuf(struct file *filp, void *priv,
1271 struct v4l2_buffer *buf)
1272{
1273 struct cafe_camera *cam = filp->private_data;
1274 int ret = -EINVAL;
1275
1276 mutex_lock(&cam->s_mutex);
1277 if (buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1278 goto out;
1279 if (buf->index < 0 || buf->index >= cam->n_sbufs)
1280 goto out;
1281 *buf = cam->sb_bufs[buf->index].v4lbuf;
1282 ret = 0;
1283 out:
1284 mutex_unlock(&cam->s_mutex);
1285 return ret;
1286}
1287
1288static int cafe_vidioc_qbuf(struct file *filp, void *priv,
1289 struct v4l2_buffer *buf)
1290{
1291 struct cafe_camera *cam = filp->private_data;
1292 struct cafe_sio_buffer *sbuf;
1293 int ret = -EINVAL;
1294 unsigned long flags;
1295
1296 mutex_lock(&cam->s_mutex);
1297 if (buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1298 goto out;
1299 if (buf->index < 0 || buf->index >= cam->n_sbufs)
1300 goto out;
1301 sbuf = cam->sb_bufs + buf->index;
1302 if (sbuf->v4lbuf.flags & V4L2_BUF_FLAG_QUEUED) {
1303 ret = 0; /* Already queued?? */
1304 goto out;
1305 }
1306 if (sbuf->v4lbuf.flags & V4L2_BUF_FLAG_DONE) {
1307 /* Spec doesn't say anything, seems appropriate tho */
1308 ret = -EBUSY;
1309 goto out;
1310 }
1311 sbuf->v4lbuf.flags |= V4L2_BUF_FLAG_QUEUED;
1312 spin_lock_irqsave(&cam->dev_lock, flags);
1313 list_add(&sbuf->list, &cam->sb_avail);
1314 spin_unlock_irqrestore(&cam->dev_lock, flags);
1315 ret = 0;
1316 out:
1317 mutex_unlock(&cam->s_mutex);
1318 return ret;
1319}
1320
1321static int cafe_vidioc_dqbuf(struct file *filp, void *priv,
1322 struct v4l2_buffer *buf)
1323{
1324 struct cafe_camera *cam = filp->private_data;
1325 struct cafe_sio_buffer *sbuf;
1326 int ret = -EINVAL;
1327 unsigned long flags;
1328
1329 mutex_lock(&cam->s_mutex);
1330 if (buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1331 goto out_unlock;
1332 if (cam->state != S_STREAMING)
1333 goto out_unlock;
1334 if (list_empty(&cam->sb_full) && filp->f_flags & O_NONBLOCK) {
1335 ret = -EAGAIN;
1336 goto out_unlock;
1337 }
1338
1339 while (list_empty(&cam->sb_full) && cam->state == S_STREAMING) {
1340 mutex_unlock(&cam->s_mutex);
1341 if (wait_event_interruptible(cam->iowait,
1342 !list_empty(&cam->sb_full))) {
1343 ret = -ERESTARTSYS;
1344 goto out;
1345 }
1346 mutex_lock(&cam->s_mutex);
1347 }
1348
1349 if (cam->state != S_STREAMING)
1350 ret = -EINTR;
1351 else {
1352 spin_lock_irqsave(&cam->dev_lock, flags);
1353 /* Should probably recheck !list_empty() here */
1354 sbuf = list_entry(cam->sb_full.next,
1355 struct cafe_sio_buffer, list);
1356 list_del_init(&sbuf->list);
1357 spin_unlock_irqrestore(&cam->dev_lock, flags);
1358 sbuf->v4lbuf.flags &= ~V4L2_BUF_FLAG_DONE;
1359 *buf = sbuf->v4lbuf;
1360 ret = 0;
1361 }
1362
1363 out_unlock:
1364 mutex_unlock(&cam->s_mutex);
1365 out:
1366 return ret;
1367}
1368
1369
1370
1371static void cafe_v4l_vm_open(struct vm_area_struct *vma)
1372{
1373 struct cafe_sio_buffer *sbuf = vma->vm_private_data;
1374 /*
1375 * Locking: done under mmap_sem, so we don't need to
1376 * go back to the camera lock here.
1377 */
1378 sbuf->mapcount++;
1379}
1380
1381
1382static void cafe_v4l_vm_close(struct vm_area_struct *vma)
1383{
1384 struct cafe_sio_buffer *sbuf = vma->vm_private_data;
1385
1386 mutex_lock(&sbuf->cam->s_mutex);
1387 sbuf->mapcount--;
1388 /* Docs say we should stop I/O too... */
1389 if (sbuf->mapcount == 0)
1390 sbuf->v4lbuf.flags &= ~V4L2_BUF_FLAG_MAPPED;
1391 mutex_unlock(&sbuf->cam->s_mutex);
1392}
1393
1394static struct vm_operations_struct cafe_v4l_vm_ops = {
1395 .open = cafe_v4l_vm_open,
1396 .close = cafe_v4l_vm_close
1397};
1398
1399
1400static int cafe_v4l_mmap(struct file *filp, struct vm_area_struct *vma)
1401{
1402 struct cafe_camera *cam = filp->private_data;
1403 unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
1404 int ret = -EINVAL;
1405 int i;
1406 struct cafe_sio_buffer *sbuf = NULL;
1407
1408 if (! (vma->vm_flags & VM_WRITE) || ! (vma->vm_flags & VM_SHARED))
1409 return -EINVAL;
1410 /*
1411 * Find the buffer they are looking for.
1412 */
1413 mutex_lock(&cam->s_mutex);
1414 for (i = 0; i < cam->n_sbufs; i++)
1415 if (cam->sb_bufs[i].v4lbuf.m.offset == offset) {
1416 sbuf = cam->sb_bufs + i;
1417 break;
1418 }
1419 if (sbuf == NULL)
1420 goto out;
1421
1422 ret = remap_vmalloc_range(vma, sbuf->buffer, 0);
1423 if (ret)
1424 goto out;
1425 vma->vm_flags |= VM_DONTEXPAND;
1426 vma->vm_private_data = sbuf;
1427 vma->vm_ops = &cafe_v4l_vm_ops;
1428 sbuf->v4lbuf.flags |= V4L2_BUF_FLAG_MAPPED;
1429 cafe_v4l_vm_open(vma);
1430 ret = 0;
1431 out:
1432 mutex_unlock(&cam->s_mutex);
1433 return ret;
1434}
1435
1436
1437
1438static int cafe_v4l_open(struct inode *inode, struct file *filp)
1439{
1440 struct cafe_camera *cam;
1441
1442 cam = cafe_find_dev(iminor(inode));
1443 if (cam == NULL)
1444 return -ENODEV;
1445 filp->private_data = cam;
1446
1447 mutex_lock(&cam->s_mutex);
1448 if (cam->users == 0) {
1449 cafe_ctlr_power_up(cam);
1450 __cafe_cam_reset(cam);
1451 cafe_set_config_needed(cam, 1);
1452 /* FIXME make sure this is complete */
1453 }
1454 (cam->users)++;
1455 mutex_unlock(&cam->s_mutex);
1456 return 0;
1457}
1458
1459
1460static int cafe_v4l_release(struct inode *inode, struct file *filp)
1461{
1462 struct cafe_camera *cam = filp->private_data;
1463
1464 mutex_lock(&cam->s_mutex);
1465 (cam->users)--;
1466 if (filp == cam->owner) {
1467 cafe_ctlr_stop_dma(cam);
1468 cafe_free_sio_buffers(cam);
1469 cam->owner = NULL;
1470 }
1471 if (cam->users == 0)
1472 cafe_ctlr_power_down(cam);
1473 mutex_unlock(&cam->s_mutex);
1474 return 0;
1475}
1476
1477
1478
1479static unsigned int cafe_v4l_poll(struct file *filp,
1480 struct poll_table_struct *pt)
1481{
1482 struct cafe_camera *cam = filp->private_data;
1483
1484 poll_wait(filp, &cam->iowait, pt);
1485 if (cam->next_buf >= 0)
1486 return POLLIN | POLLRDNORM;
1487 return 0;
1488}
1489
1490
1491
1492static int cafe_vidioc_queryctrl(struct file *filp, void *priv,
1493 struct v4l2_queryctrl *qc)
1494{
1495 struct cafe_camera *cam = filp->private_data;
1496 int ret;
1497
1498 mutex_lock(&cam->s_mutex);
1499 ret = __cafe_cam_cmd(cam, VIDIOC_QUERYCTRL, qc);
1500 mutex_unlock(&cam->s_mutex);
1501 return ret;
1502}
1503
1504
1505static int cafe_vidioc_g_ctrl(struct file *filp, void *priv,
1506 struct v4l2_control *ctrl)
1507{
1508 struct cafe_camera *cam = filp->private_data;
1509 int ret;
1510
1511 mutex_lock(&cam->s_mutex);
1512 ret = __cafe_cam_cmd(cam, VIDIOC_G_CTRL, ctrl);
1513 mutex_unlock(&cam->s_mutex);
1514 return ret;
1515}
1516
1517
1518static int cafe_vidioc_s_ctrl(struct file *filp, void *priv,
1519 struct v4l2_control *ctrl)
1520{
1521 struct cafe_camera *cam = filp->private_data;
1522 int ret;
1523
1524 mutex_lock(&cam->s_mutex);
1525 ret = __cafe_cam_cmd(cam, VIDIOC_S_CTRL, ctrl);
1526 mutex_unlock(&cam->s_mutex);
1527 return ret;
1528}
1529
1530
1531
1532
1533
1534static int cafe_vidioc_querycap(struct file *file, void *priv,
1535 struct v4l2_capability *cap)
1536{
1537 strcpy(cap->driver, "cafe_ccic");
1538 strcpy(cap->card, "cafe_ccic");
1539 cap->version = CAFE_VERSION;
1540 cap->capabilities = V4L2_CAP_VIDEO_CAPTURE |
1541 V4L2_CAP_READWRITE | V4L2_CAP_STREAMING;
1542 return 0;
1543}
1544
1545
1546/*
1547 * The default format we use until somebody says otherwise.
1548 */
1549static struct v4l2_pix_format cafe_def_pix_format = {
1550 .width = VGA_WIDTH,
1551 .height = VGA_HEIGHT,
1552 .pixelformat = V4L2_PIX_FMT_YUYV,
1553 .field = V4L2_FIELD_NONE,
1554 .bytesperline = VGA_WIDTH*2,
1555 .sizeimage = VGA_WIDTH*VGA_HEIGHT*2,
1556};
1557
1558static int cafe_vidioc_enum_fmt_cap(struct file *filp,
1559 void *priv, struct v4l2_fmtdesc *fmt)
1560{
1561 struct cafe_camera *cam = priv;
1562 int ret;
1563
1564 if (fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1565 return -EINVAL;
1566 mutex_lock(&cam->s_mutex);
1567 ret = __cafe_cam_cmd(cam, VIDIOC_ENUM_FMT, fmt);
1568 mutex_unlock(&cam->s_mutex);
1569 return ret;
1570}
1571
1572
1573static int cafe_vidioc_try_fmt_cap (struct file *filp, void *priv,
1574 struct v4l2_format *fmt)
1575{
1576 struct cafe_camera *cam = priv;
1577 int ret;
1578
1579 mutex_lock(&cam->s_mutex);
1580 ret = __cafe_cam_cmd(cam, VIDIOC_TRY_FMT, fmt);
1581 mutex_unlock(&cam->s_mutex);
1582 return ret;
1583}
1584
1585static int cafe_vidioc_s_fmt_cap(struct file *filp, void *priv,
1586 struct v4l2_format *fmt)
1587{
1588 struct cafe_camera *cam = priv;
1589 int ret;
1590
1591 /*
1592 * Can't do anything if the device is not idle
1593 * Also can't if there are streaming buffers in place.
1594 */
1595 if (cam->state != S_IDLE || cam->n_sbufs > 0)
1596 return -EBUSY;
1597 /*
1598 * See if the formatting works in principle.
1599 */
1600 ret = cafe_vidioc_try_fmt_cap(filp, priv, fmt);
1601 if (ret)
1602 return ret;
1603 /*
1604 * Now we start to change things for real, so let's do it
1605 * under lock.
1606 */
1607 mutex_lock(&cam->s_mutex);
1608 cam->pix_format = fmt->fmt.pix;
1609 /*
1610 * Make sure we have appropriate DMA buffers.
1611 */
1612 ret = -ENOMEM;
1613 if (cam->nbufs > 0 && cam->dma_buf_size < cam->pix_format.sizeimage)
1614 cafe_free_dma_bufs(cam);
1615 if (cam->nbufs == 0) {
1616 if (cafe_alloc_dma_bufs(cam, 0))
1617 goto out;
1618 }
1619 /*
1620 * It looks like this might work, so let's program the sensor.
1621 */
1622 ret = cafe_cam_configure(cam);
1623 if (! ret)
1624 ret = cafe_ctlr_configure(cam);
1625 out:
1626 mutex_unlock(&cam->s_mutex);
1627 return ret;
1628}
1629
1630/*
1631 * Return our stored notion of how the camera is/should be configured.
1632 * The V4l2 spec wants us to be smarter, and actually get this from
1633 * the camera (and not mess with it at open time). Someday.
1634 */
1635static int cafe_vidioc_g_fmt_cap(struct file *filp, void *priv,
1636 struct v4l2_format *f)
1637{
1638 struct cafe_camera *cam = priv;
1639
1640 f->fmt.pix = cam->pix_format;
1641 return 0;
1642}
1643
1644/*
1645 * We only have one input - the sensor - so minimize the nonsense here.
1646 */
1647static int cafe_vidioc_enum_input(struct file *filp, void *priv,
1648 struct v4l2_input *input)
1649{
1650 if (input->index != 0)
1651 return -EINVAL;
1652
1653 input->type = V4L2_INPUT_TYPE_CAMERA;
1654 input->std = V4L2_STD_ALL; /* Not sure what should go here */
1655 strcpy(input->name, "Camera");
1656 return 0;
1657}
1658
1659static int cafe_vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
1660{
1661 *i = 0;
1662 return 0;
1663}
1664
1665static int cafe_vidioc_s_input(struct file *filp, void *priv, unsigned int i)
1666{
1667 if (i != 0)
1668 return -EINVAL;
1669 return 0;
1670}
1671
1672/* from vivi.c */
1673static int cafe_vidioc_s_std(struct file *filp, void *priv, v4l2_std_id a)
1674{
1675 return 0;
1676}
1677
1678
1679/*
1680 * The TV Norm stuff is weird - we're a camera with little to do with TV,
1681 * really. The following is what vivi does.
1682 */
1683static struct v4l2_tvnorm cafe_tvnorm[] = {
1684 {
1685 .name = "NTSC-M",
1686 .id = V4L2_STD_NTSC_M,
1687 }
1688};
1689
1690
ab33668f 1691static void cafe_v4l_dev_release(struct video_device *vd)
d905b382
JC		 1692{
1693 struct cafe_camera *cam = container_of(vd, struct cafe_camera, v4ldev);
1694
1695 kfree(cam);
1696}
1697
1698
1699/*
1700 * This template device holds all of those v4l2 methods; we
1701 * clone it for specific real devices.
1702 */
1703
1704static struct file_operations cafe_v4l_fops = {
1705 .owner = THIS_MODULE,
1706 .open = cafe_v4l_open,
1707 .release = cafe_v4l_release,
1708 .read = cafe_v4l_read,
1709 .poll = cafe_v4l_poll,
1710 .mmap = cafe_v4l_mmap,
1711 .ioctl = video_ioctl2,
1712 .llseek = no_llseek,
1713};
1714
1715static struct video_device cafe_v4l_template = {
1716 .name = "cafe",
1717 .type = VFL_TYPE_GRABBER,
1718 .type2 = VID_TYPE_CAPTURE,
1719 .minor = -1, /* Get one dynamically */
1720 .tvnorms = cafe_tvnorm,
1721 .tvnormsize = 1,
1722 .current_norm = V4L2_STD_NTSC_M, /* make mplayer happy */
1723
1724 .fops = &cafe_v4l_fops,
1725 .release = cafe_v4l_dev_release,
1726
1727 .vidioc_querycap = cafe_vidioc_querycap,
1728 .vidioc_enum_fmt_cap = cafe_vidioc_enum_fmt_cap,
1729 .vidioc_try_fmt_cap = cafe_vidioc_try_fmt_cap,
1730 .vidioc_s_fmt_cap = cafe_vidioc_s_fmt_cap,
1731 .vidioc_g_fmt_cap = cafe_vidioc_g_fmt_cap,
1732 .vidioc_enum_input = cafe_vidioc_enum_input,
1733 .vidioc_g_input = cafe_vidioc_g_input,
1734 .vidioc_s_input = cafe_vidioc_s_input,
1735 .vidioc_s_std = cafe_vidioc_s_std,
1736 .vidioc_reqbufs = cafe_vidioc_reqbufs,
1737 .vidioc_querybuf = cafe_vidioc_querybuf,
1738 .vidioc_qbuf = cafe_vidioc_qbuf,
1739 .vidioc_dqbuf = cafe_vidioc_dqbuf,
1740 .vidioc_streamon = cafe_vidioc_streamon,
1741 .vidioc_streamoff = cafe_vidioc_streamoff,
1742 .vidioc_queryctrl = cafe_vidioc_queryctrl,
1743 .vidioc_g_ctrl = cafe_vidioc_g_ctrl,
1744 .vidioc_s_ctrl = cafe_vidioc_s_ctrl,
1745 /* Do cropping someday */
1746};
1747
1748
1749
1750
1751
1752
1753
1754/* ---------------------------------------------------------------------- */
1755/*
1756 * Interrupt handler stuff
1757 */
1758
1759/*
1760 * Create RGB32 from RGB444 so it can be displayed before the applications
1761 * know about the latter format.
1762 */
1763static void cafe_fake_rgb32(struct cafe_camera *cam, char *dest, char *src)
1764{
1765 int i;
1766 u16 *ssrc = (u16 *) src;
1767
1768 /* RGB444 version */
1769 for (i = 0; i < cam->pix_format.sizeimage; i += 4) {
1770 // dest[0] = (*ssrc & 0xf000) >> 8;
1771 dest[0] = (*ssrc & 0x000f) << 4;
1772 dest[1] = (*ssrc & 0x00f0);
1773 dest[2] = (*ssrc & 0x0f00) >> 4;
1774 dest[3] = (*ssrc & 0xf000); /* Alpha */
1775 dest += 4;
1776 ssrc++;
1777 }
1778}
1779
1780
1781static void cafe_frame_tasklet(unsigned long data)
1782{
1783 struct cafe_camera *cam = (struct cafe_camera *) data;
1784 int i;
1785 unsigned long flags;
1786 struct cafe_sio_buffer *sbuf;
1787
1788 spin_lock_irqsave(&cam->dev_lock, flags);
1789 for (i = 0; i < cam->nbufs; i++) {
1790 int bufno = cam->next_buf;
1791 if (bufno < 0) { /* "will never happen" */
1792 cam_err(cam, "No valid bufs in tasklet!\n");
1793 break;
1794 }
1795 if (++(cam->next_buf) >= cam->nbufs)
1796 cam->next_buf = 0;
1797 if (! test_bit(bufno, &cam->flags))
1798 continue;
1799 if (list_empty(&cam->sb_avail))
1800 break; /* Leave it valid, hope for better later */
1801 clear_bit(bufno, &cam->flags);
1802 /*
1803 * We could perhaps drop the spinlock during this
1804 * big copy. Something to consider.
1805 */
1806 sbuf = list_entry(cam->sb_avail.next,
1807 struct cafe_sio_buffer, list);
1808 if (cam->pix_format.pixelformat == V4L2_PIX_FMT_RGB32)
1809 cafe_fake_rgb32(cam, sbuf->buffer, cam->dma_bufs[bufno]);
1810 else
1811 memcpy(sbuf->buffer, cam->dma_bufs[bufno],
1812 cam->pix_format.sizeimage);
1813 sbuf->v4lbuf.bytesused = cam->pix_format.sizeimage;
1814 sbuf->v4lbuf.sequence = cam->buf_seq[bufno];
1815 sbuf->v4lbuf.flags &= ~V4L2_BUF_FLAG_QUEUED;
1816 sbuf->v4lbuf.flags |= V4L2_BUF_FLAG_DONE;
1817 list_move_tail(&sbuf->list, &cam->sb_full);
1818 }
1819 if (! list_empty(&cam->sb_full))
1820 wake_up(&cam->iowait);
1821 spin_unlock_irqrestore(&cam->dev_lock, flags);
1822}
1823
1824
1825
1826static void cafe_frame_complete(struct cafe_camera *cam, int frame)
1827{
1828 /*
1829 * Basic frame housekeeping.
1830 */
1831 if (test_bit(frame, &cam->flags) && printk_ratelimit())
1832 cam_err(cam, "Frame overrun on %d, frames lost\n", frame);
1833 set_bit(frame, &cam->flags);
1834 clear_bit(CF_DMA_ACTIVE, &cam->flags);
1835 if (cam->next_buf < 0)
1836 cam->next_buf = frame;
1837 cam->buf_seq[frame] = ++(cam->sequence);
1838
1839 switch (cam->state) {
1840 /*
1841 * If in single read mode, try going speculative.
1842 */
1843 case S_SINGLEREAD:
1844 cam->state = S_SPECREAD;
1845 cam->specframes = 0;
1846 wake_up(&cam->iowait);
1847 break;
1848
1849 /*
1850 * If we are already doing speculative reads, and nobody is
1851 * reading them, just stop.
1852 */
1853 case S_SPECREAD:
1854 if (++(cam->specframes) >= cam->nbufs) {
1855 cafe_ctlr_stop(cam);
1856 cafe_ctlr_irq_disable(cam);
1857 cam->state = S_IDLE;
1858 }
1859 wake_up(&cam->iowait);
1860 break;
1861 /*
1862 * For the streaming case, we defer the real work to the
1863 * camera tasklet.
1864 *
1865 * FIXME: if the application is not consuming the buffers,
1866 * we should eventually put things on hold and restart in
1867 * vidioc_dqbuf().
1868 */
1869 case S_STREAMING:
1870 tasklet_schedule(&cam->s_tasklet);
1871 break;
1872
1873 default:
1874 cam_err(cam, "Frame interrupt in non-operational state\n");
1875 break;
1876 }
1877}
1878
1879
1880
1881
1882static void cafe_frame_irq(struct cafe_camera *cam, unsigned int irqs)
1883{
1884 unsigned int frame;
1885
1886 cafe_reg_write(cam, REG_IRQSTAT, FRAMEIRQS); /* Clear'em all */
1887 /*
1888 * Handle any frame completions. There really should
1889 * not be more than one of these, or we have fallen
1890 * far behind.
1891 */
1892 for (frame = 0; frame < cam->nbufs; frame++)
1893 if (irqs & (IRQ_EOF0 << frame))
1894 cafe_frame_complete(cam, frame);
1895 /*
1896 * If a frame starts, note that we have DMA active. This
1897 * code assumes that we won't get multiple frame interrupts
1898 * at once; may want to rethink that.
1899 */
1900 if (irqs & (IRQ_SOF0 | IRQ_SOF1 | IRQ_SOF2))
1901 set_bit(CF_DMA_ACTIVE, &cam->flags);
1902}
1903
1904
1905
1906static irqreturn_t cafe_irq(int irq, void *data)
1907{
1908 struct cafe_camera *cam = data;
1909 unsigned int irqs;
1910
1911 spin_lock(&cam->dev_lock);
1912 irqs = cafe_reg_read(cam, REG_IRQSTAT);
1913 if ((irqs & ALLIRQS) == 0) {
1914 spin_unlock(&cam->dev_lock);
1915 return IRQ_NONE;
1916 }
1917 if (irqs & FRAMEIRQS)
1918 cafe_frame_irq(cam, irqs);
1919 if (irqs & TWSIIRQS) {
1920 cafe_reg_write(cam, REG_IRQSTAT, TWSIIRQS);
1921 wake_up(&cam->smbus_wait);
1922 }
1923 spin_unlock(&cam->dev_lock);
1924 return IRQ_HANDLED;
1925}
1926
1927
1928/* -------------------------------------------------------------------------- */
1929#ifdef CONFIG_VIDEO_ADV_DEBUG
1930/*
1931 * Debugfs stuff.
1932 */
1933
1934static char cafe_debug_buf[1024];
1935static struct dentry *cafe_dfs_root;
1936
1937static void cafe_dfs_setup(void)
1938{
1939 cafe_dfs_root = debugfs_create_dir("cafe_ccic", NULL);
1940 if (IS_ERR(cafe_dfs_root)) {
1941 cafe_dfs_root = NULL; /* Never mind */
1942 printk(KERN_NOTICE "cafe_ccic unable to set up debugfs\n");
1943 }
1944}
1945
1946static void cafe_dfs_shutdown(void)
1947{
1948 if (cafe_dfs_root)
1949 debugfs_remove(cafe_dfs_root);
1950}
1951
1952static int cafe_dfs_open(struct inode *inode, struct file *file)
1953{
1954 file->private_data = inode->i_private;
1955 return 0;
1956}
1957
1958static ssize_t cafe_dfs_read_regs(struct file *file,
1959 char __user *buf, size_t count, loff_t *ppos)
1960{
1961 struct cafe_camera *cam = file->private_data;
1962 char *s = cafe_debug_buf;
1963 int offset;
1964
1965 for (offset = 0; offset < 0x44; offset += 4)
1966 s += sprintf(s, "%02x: %08x\n", offset,
1967 cafe_reg_read(cam, offset));
1968 for (offset = 0x88; offset <= 0x90; offset += 4)
1969 s += sprintf(s, "%02x: %08x\n", offset,
1970 cafe_reg_read(cam, offset));
1971 for (offset = 0xb4; offset <= 0xbc; offset += 4)
1972 s += sprintf(s, "%02x: %08x\n", offset,
1973 cafe_reg_read(cam, offset));
1974 for (offset = 0x3000; offset <= 0x300c; offset += 4)
1975 s += sprintf(s, "%04x: %08x\n", offset,
1976 cafe_reg_read(cam, offset));
1977 return simple_read_from_buffer(buf, count, ppos, cafe_debug_buf,
1978 s - cafe_debug_buf);
1979}
1980
1981static struct file_operations cafe_dfs_reg_ops = {
1982 .owner = THIS_MODULE,
1983 .read = cafe_dfs_read_regs,
1984 .open = cafe_dfs_open
1985};
1986
1987static ssize_t cafe_dfs_read_cam(struct file *file,
1988 char __user *buf, size_t count, loff_t *ppos)
1989{
1990 struct cafe_camera *cam = file->private_data;
1991 char *s = cafe_debug_buf;
1992 int offset;
1993
1994 if (! cam->sensor)
1995 return -EINVAL;
1996 for (offset = 0x0; offset < 0x8a; offset++)
1997 {
1998 u8 v;
1999
2000 cafe_smbus_read_data(cam, cam->sensor->addr, offset, &v);
2001 s += sprintf(s, "%02x: %02x\n", offset, v);
2002 }
2003 return simple_read_from_buffer(buf, count, ppos, cafe_debug_buf,
2004 s - cafe_debug_buf);
2005}
2006
2007static struct file_operations cafe_dfs_cam_ops = {
2008 .owner = THIS_MODULE,
2009 .read = cafe_dfs_read_cam,
2010 .open = cafe_dfs_open
2011};
2012
2013
2014
2015static void cafe_dfs_cam_setup(struct cafe_camera *cam)
2016{
2017 char fname[40];
2018
2019 if (!cafe_dfs_root)
2020 return;
2021 sprintf(fname, "regs-%d", cam->v4ldev.minor);
2022 cam->dfs_regs = debugfs_create_file(fname, 0444, cafe_dfs_root,
2023 cam, &cafe_dfs_reg_ops);
2024 sprintf(fname, "cam-%d", cam->v4ldev.minor);
2025 cam->dfs_cam_regs = debugfs_create_file(fname, 0444, cafe_dfs_root,
2026 cam, &cafe_dfs_cam_ops);
2027}
2028
2029
2030static void cafe_dfs_cam_shutdown(struct cafe_camera *cam)
2031{
2032 if (! IS_ERR(cam->dfs_regs))
2033 debugfs_remove(cam->dfs_regs);
2034 if (! IS_ERR(cam->dfs_cam_regs))
2035 debugfs_remove(cam->dfs_cam_regs);
2036}
2037
2038#else
2039
2040#define cafe_dfs_setup()
2041#define cafe_dfs_shutdown()
2042#define cafe_dfs_cam_setup(cam)
2043#define cafe_dfs_cam_shutdown(cam)
2044#endif /* CONFIG_VIDEO_ADV_DEBUG */
2045
2046
2047
2048
2049/* ------------------------------------------------------------------------*/
2050/*
2051 * PCI interface stuff.
2052 */
2053
2054static int cafe_pci_probe(struct pci_dev *pdev,
2055 const struct pci_device_id *id)
2056{
2057 int ret;
2058 u16 classword;
2059 struct cafe_camera *cam;
2060 /*
2061 * Make sure we have a camera here - we'll get calls for
2062 * the other cafe devices as well.
2063 */
2064 pci_read_config_word(pdev, PCI_CLASS_DEVICE, &classword);
2065 if (classword != PCI_CLASS_MULTIMEDIA_VIDEO)
2066 return -ENODEV;
2067 /*
2068 * Start putting together one of our big camera structures.
2069 */
2070 ret = -ENOMEM;
2071 cam = kzalloc(sizeof(struct cafe_camera), GFP_KERNEL);
2072 if (cam == NULL)
2073 goto out;
2074 mutex_init(&cam->s_mutex);
2075 mutex_lock(&cam->s_mutex);
2076 spin_lock_init(&cam->dev_lock);
2077 cam->state = S_NOTREADY;
2078 cafe_set_config_needed(cam, 1);
2079 init_waitqueue_head(&cam->smbus_wait);
2080 init_waitqueue_head(&cam->iowait);
2081 cam->pdev = pdev;
2082 cam->pix_format = cafe_def_pix_format;
2083 INIT_LIST_HEAD(&cam->dev_list);
2084 INIT_LIST_HEAD(&cam->sb_avail);
2085 INIT_LIST_HEAD(&cam->sb_full);
2086 tasklet_init(&cam->s_tasklet, cafe_frame_tasklet, (unsigned long) cam);
2087 /*
2088 * Get set up on the PCI bus.
2089 */
2090 ret = pci_enable_device(pdev);
2091 if (ret)
2092 goto out_free;
2093 pci_set_master(pdev);
2094
2095 ret = -EIO;
2096 cam->regs = pci_iomap(pdev, 0, 0);
2097 if (! cam->regs) {
2098 printk(KERN_ERR "Unable to ioremap cafe-ccic regs\n");
2099 goto out_free;
2100 }
2101 ret = request_irq(pdev->irq, cafe_irq, IRQF_SHARED, "cafe-ccic", cam);
2102 if (ret)
2103 goto out_iounmap;
2104 cafe_ctlr_init(cam);
2105 cafe_ctlr_power_up(cam);
2106 /*
2107 * Set up I2C/SMBUS communications
2108 */
2109 mutex_unlock(&cam->s_mutex); /* attach can deadlock */
2110 ret = cafe_smbus_setup(cam);
2111 if (ret)
2112 goto out_freeirq;
2113 /*
2114 * Get the v4l2 setup done.
2115 */
2116 mutex_lock(&cam->s_mutex);
2117 cam->v4ldev = cafe_v4l_template;
2118 cam->v4ldev.debug = 0;
2119// cam->v4ldev.debug = V4L2_DEBUG_IOCTL_ARG;
2120 ret = video_register_device(&cam->v4ldev, VFL_TYPE_GRABBER, -1);
2121 if (ret)
2122 goto out_smbus;
2123 /*
2124 * If so requested, try to get our DMA buffers now.
2125 */
2126 if (alloc_bufs_at_load) {
2127 if (cafe_alloc_dma_bufs(cam, 1))
2128 cam_warn(cam, "Unable to alloc DMA buffers at load"
2129 " will try again later.");
2130 }
2131
2132 cafe_dfs_cam_setup(cam);
2133 mutex_unlock(&cam->s_mutex);
2134 cafe_add_dev(cam);
2135 return 0;
2136
2137 out_smbus:
2138 cafe_smbus_shutdown(cam);
2139 out_freeirq:
2140 cafe_ctlr_power_down(cam);
2141 free_irq(pdev->irq, cam);
2142 out_iounmap:
2143 pci_iounmap(pdev, cam->regs);
2144 out_free:
2145 kfree(cam);
2146 out:
2147 return ret;
2148}
2149
2150
2151/*
2152 * Shut down an initialized device
2153 */
2154static void cafe_shutdown(struct cafe_camera *cam)
2155{
2156/* FIXME: Make sure we take care of everything here */
2157 cafe_dfs_cam_shutdown(cam);
2158 if (cam->n_sbufs > 0)
2159 /* What if they are still mapped? Shouldn't be, but... */
2160 cafe_free_sio_buffers(cam);
2161 cafe_remove_dev(cam);
2162 cafe_ctlr_stop_dma(cam);
2163 cafe_ctlr_power_down(cam);
2164 cafe_smbus_shutdown(cam);
2165 cafe_free_dma_bufs(cam);
2166 free_irq(cam->pdev->irq, cam);
2167 pci_iounmap(cam->pdev, cam->regs);
2168 video_unregister_device(&cam->v4ldev);
2169 /* kfree(cam); done in v4l_release () */
2170}
2171
2172
2173static void cafe_pci_remove(struct pci_dev *pdev)
2174{
2175 struct cafe_camera *cam = cafe_find_by_pdev(pdev);
2176
2177 if (cam == NULL) {
2178 cam_warn(cam, "pci_remove on unknown pdev %p\n", pdev);
2179 return;
2180 }
2181 mutex_lock(&cam->s_mutex);
2182 if (cam->users > 0)
2183 cam_warn(cam, "Removing a device with users!\n");
2184 cafe_shutdown(cam);
2185/* No unlock - it no longer exists */
2186}
2187
2188
2189
2190
2191static struct pci_device_id cafe_ids[] = {
2192 { PCI_DEVICE(0x1148, 0x4340) }, /* Temporary ID on devel board */
2193 { PCI_DEVICE(0x11ab, 0x4100) }, /* Eventual real ID */
2194 { PCI_DEVICE(0x11ab, 0x4102) }, /* Really eventual real ID */
2195 { 0, }
2196};
2197
2198MODULE_DEVICE_TABLE(pci, cafe_ids);
2199
2200static struct pci_driver cafe_pci_driver = {
2201 .name = "cafe1000-ccic",
2202 .id_table = cafe_ids,
2203 .probe = cafe_pci_probe,
2204 .remove = cafe_pci_remove,
2205};
2206
2207
2208
2209
2210static int __init cafe_init(void)
2211{
2212 int ret;
2213
2214 printk(KERN_NOTICE "Marvell M88ALP01 'CAFE' Camera Controller version %d\n",
2215 CAFE_VERSION);
2216 cafe_dfs_setup();
2217 ret = pci_register_driver(&cafe_pci_driver);
2218 if (ret) {
2219 printk(KERN_ERR "Unable to register cafe_ccic driver\n");
2220 goto out;
2221 }
2222 request_module("ov7670"); /* FIXME want something more general */
2223 ret = 0;
2224
2225 out:
2226 return ret;
2227}
2228
2229
2230static void __exit cafe_exit(void)
2231{
2232 pci_unregister_driver(&cafe_pci_driver);
2233 cafe_dfs_shutdown();
2234}
2235
2236module_init(cafe_init);
2237module_exit(cafe_exit);
Linux 6.x block layer and io_uring tree(s)