w9966.c
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上传日期:2013-04-10
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文件大小:29k
- /*
- Winbond w9966cf Webcam parport driver.
- Copyright (C) 2001 Jakob Kemi <jakob.kemi@telia.com>
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
- (at your option) any later version.
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- */
- /*
- Supported devices:
- * Lifeview Flycam Supra (Philips saa7111a chip)
- * Mikrotek Eyestar2 (Sanyo lc99053 chip)
- Very rudimentary support, total lack of ccd-control chip settings.
- Only green video data and no image properties (brightness, etc..)
- If anyone can parse the Japanese data-sheet for the Sanyo lc99053
- chip, feel free to help.
- <http://service.semic.sanyo.co.jp/semi/ds_pdf_j/LC99053.pdf>
- Thanks to Steven Griffiths <steve@sgriff.com> and
- James Murray <jsm@jsm-net.demon.co.uk> for testing.
- Todo:
- * Add a working EPP mode (Is this a parport or a w9966 issue?)
- * Add proper probing. IEEE1284 probing of w9966 chips haven't
- worked since parport drivers changed in 2.4.x.
- * Probe for onboard SRAM, port directions etc. (possible?)
- Changes:
- Alan Cox: Removed RGB mode for kernel merge, added THIS_MODULE
- and owner support for newer module locks
- */
- #include <linux/module.h>
- #include <linux/init.h>
- #include <linux/delay.h>
- #include <linux/videodev.h>
- #include <linux/parport.h>
- #include <linux/types.h>
- #include <linux/slab.h>
- //#define DEBUG // Define for debug output.
- #ifdef DEBUG
- # define DPRINTF(f, a...)
- do {
- printk ("%s%s, %d (DEBUG) %s(): ",
- KERN_DEBUG, __FILE__, __LINE__, __func__);
- printk (f, ##a);
- } while (0)
- # define DASSERT(x)
- do {
- if (!x)
- DPRINTF("Assertion failed at line %d.n", __LINE__);
- } while (0)
- #else
- # define DPRINTF(f, a...) do {} while(0)
- # define DASSERT(f, a...) do {} while(0)
- #endif
- /*
- * Defines, simple typedefs etc.
- */
- #define W9966_DRIVERNAME "w9966cf"
- #define W9966_MAXCAMS 4 // Maximum number of cameras
- #define W9966_RBUFFER 8096 // Read buffer (must be an even number)
- #define W9966_WND_MIN_W 2
- #define W9966_WND_MIN_H 1
- // Keep track of our current state
- #define W9966_STATE_PDEV 0x01 // pdev registered
- #define W9966_STATE_CLAIMED 0x02 // pdev claimed
- #define W9966_STATE_VDEV 0x04 // vdev registered
- #define W9966_STATE_BUFFER 0x08 // buffer allocated
- #define W9966_STATE_DETECTED 0x10 // model identified
- #define W9966_SAA7111_ID 0x24 // I2C device id
- #define W9966_I2C_UDELAY 5
- #define W9966_I2C_TIMEOUT 100
- #define W9966_I2C_R_DATA 0x08
- #define W9966_I2C_R_CLOCK 0x04
- #define W9966_I2C_W_DATA 0x02
- #define W9966_I2C_W_CLOCK 0x01
- #define MAX(a, b) ((a > b) ? a : b)
- #define MIN(a, b) ((a > b) ? b : a)
- struct w9966_dev {
- struct video_device vdev;
- struct parport* pport;
- struct pardevice* pdev;
- int ppmode;
- u8* buffer;
- u8 dev_state;
- u8 i2c_state;
- u16 width;
- u16 height;
- // Image properties
- u8 brightness;
- s8 contrast;
- s8 color;
- s8 hue;
- // Model specific:
- const char* name;
- u32 sramsize;
- u8 sramid; // reg 0x0c, bank layout
- u8 cmask; // reg 0x01, for polarity
- u16 min_x, max_x; // Capture window limits
- u16 min_y, max_y;
- int (*image)(struct w9966_dev* cam);
- };
- /*
- * Module properties
- */
- MODULE_AUTHOR("Jakob Kemi <jakob.kemi@telia.com>");
- MODULE_DESCRIPTION("Winbond w9966cf webcam driver (Flycam Supra and others)");
- MODULE_LICENSE("GPL");
- static const char* pardev[] = {[0 ... W9966_MAXCAMS-1] = "auto"};
- MODULE_PARM(pardev, "0-" __MODULE_STRING(W9966_MAXCAMS) "s");
- MODULE_PARM_DESC(pardev,"n
- <auto|name|none[,...]> Where to find cameras.n
- auto = probe all parports for camera (default)n
- name = name of parport (eg parport0)n
- none = don't use this cameran
- You can specify all cameras this way, for example:n
- pardev=parport2,auto,none,parport0 would search for cam1 on parport2, searchn
- for cam2 on all parports, skip cam3 and search for cam4 on parport0");
- static int parmode = 1;
- MODULE_PARM(parmode, "i");
- MODULE_PARM_DESC(parmode, "n<0|1|2|3> transfer mode (0=auto, 1=ecp(default), 2=epp, 3=forced hw-ecp)");
- static int video_nr[] = {[0 ... W9966_MAXCAMS-1] = -1};
- MODULE_PARM(video_nr, "0-" __MODULE_STRING(W9966_MAXCAMS) "i");
- MODULE_PARM_DESC(video_nr,"n
- <-1|n[,...]> Specify V4L minor mode number.n
- -1 = use next available (default)n
- n = use minor number n (integer >= 0)n
- You can specify all cameras this way, for example:n
- video_nr=-1,2,-1 would assign minor number 2 for cam2 and use auto for cam1,n
- cam3 and cam4");
- /*
- * Private data
- */
- static struct w9966_dev* w9966_cams;
- /*
- * Private function declarations
- */
- static inline void w9966_flag_set(struct w9966_dev* cam, int flag) {
- cam->dev_state |= flag;}
- static inline void w9966_flag_clear(struct w9966_dev* cam, int flag) {
- cam->dev_state &= ~flag;}
- static inline int w9966_flag_test(struct w9966_dev* cam, int flag) {
- return (cam->dev_state & flag);}
- static inline int w9966_pdev_claim(struct w9966_dev *vdev);
- static inline void w9966_pdev_release(struct w9966_dev *vdev);
- static int w9966_rreg(struct w9966_dev* cam, int reg);
- static int w9966_wreg(struct w9966_dev* cam, int reg, int data);
- static int w9966_init(struct w9966_dev* cam, struct parport* port, int vidnr);
- static void w9966_term(struct w9966_dev* cam);
- static int w9966_setup(struct w9966_dev* cam);
- static int w9966_findlen(int near, int size, int maxlen);
- static int w9966_calcscale(int size, int min, int max,
- int* beg, int* end, u8* factor);
- static int w9966_window(struct w9966_dev* cam, int x1, int y1,
- int x2, int y2, int w, int h);
- static int w9966_saa7111_init(struct w9966_dev* cam);
- static int w9966_saa7111_image(struct w9966_dev* cam);
- static int w9966_lc99053_init(struct w9966_dev* cam);
- static int w9966_lc99053_image(struct w9966_dev* cam);
- static inline void w9966_i2c_setsda(struct w9966_dev* cam, int state);
- static inline int w9966_i2c_setscl(struct w9966_dev* cam, int state);
- static inline int w9966_i2c_getsda(struct w9966_dev* cam);
- static inline int w9966_i2c_getscl(struct w9966_dev* cam);
- static int w9966_i2c_wbyte(struct w9966_dev* cam, int data);
- static int w9966_i2c_rbyte(struct w9966_dev* cam);
- static int w9966_i2c_rreg(struct w9966_dev* cam, int device, int reg);
- static int w9966_i2c_wreg(struct w9966_dev* cam, int device, int reg, int data);
- static int w9966_v4l_open(struct video_device *vdev, int mode);
- static void w9966_v4l_close(struct video_device *vdev);
- static int w9966_v4l_ioctl(struct video_device *vdev,
- unsigned int cmd, void *arg);
- static long w9966_v4l_read(struct video_device *vdev,
- char *buf, unsigned long count, int noblock);
- /*
- * Private function definitions
- */
- // Claim parport for ourself
- // 1 on success, else 0
- static inline int w9966_pdev_claim(struct w9966_dev* cam)
- {
- if (w9966_flag_test(cam, W9966_STATE_CLAIMED))
- return 1;
- if (parport_claim_or_block(cam->pdev) < 0)
- return 0;
- w9966_flag_set(cam, W9966_STATE_CLAIMED);
- return 1;
- }
- // Release parport for others to use
- static inline void w9966_pdev_release(struct w9966_dev* cam)
- {
- if (!w9966_flag_test(cam, W9966_STATE_CLAIMED))
- return;
- parport_release(cam->pdev);
- w9966_flag_clear(cam, W9966_STATE_CLAIMED);
- }
- // Read register from w9966 interface-chip
- // Expects a claimed pdev
- // -1 on error, else register data (byte)
- static int w9966_rreg(struct w9966_dev* cam, int reg)
- {
- // ECP, read, regtransfer, REG, REG, REG, REG, REG
- const u8 addr = 0x80 | (reg & 0x1f);
- u8 val;
- if (parport_negotiate(cam->pport, cam->ppmode | IEEE1284_ADDR) != 0 ||
- parport_write(cam->pport, &addr, 1) != 1 ||
- parport_negotiate(cam->pport, cam->ppmode | IEEE1284_DATA) != 0 ||
- parport_read(cam->pport, &val, 1) != 1)
- return -1;
- return val;
- }
- // Write register to w9966 interface-chip
- // Expects a claimed pdev
- // 1 on success, else 0
- static int w9966_wreg(struct w9966_dev* cam, int reg, int data)
- {
- // ECP, write, regtransfer, REG, REG, REG, REG, REG
- const u8 addr = 0xc0 | (reg & 0x1f);
- const u8 val = data;
- if (parport_negotiate(cam->pport, cam->ppmode | IEEE1284_ADDR) != 0 ||
- parport_write(cam->pport, &addr, 1) != 1 ||
- parport_negotiate(cam->pport, cam->ppmode | IEEE1284_DATA) != 0 ||
- parport_write(cam->pport, &val, 1) != 1)
- return 0;
- return 1;
- }
- // Initialize camera device. Setup all internal flags, set a
- // default video mode, setup ccd-chip, register v4l device etc..
- // Also used for 'probing' of hardware.
- // 1 on success, else 0
- static int w9966_init(struct w9966_dev* cam, struct parport* port, int vidnr)
- {
- if (cam->dev_state != 0)
- return 0;
- cam->pport = port;
- cam->brightness = 128;
- cam->contrast = 64;
- cam->color = 64;
- cam->hue = 0;
- // Select requested transfer mode
- switch(parmode)
- {
- default: // Auto-detect (priority: hw-ecp, hw-epp, sw-ecp)
- case 0:
- if (port->modes & PARPORT_MODE_ECP)
- cam->ppmode = IEEE1284_MODE_ECP;
- else if (port->modes & PARPORT_MODE_EPP)
- cam->ppmode = IEEE1284_MODE_EPP;
- else
- cam->ppmode = IEEE1284_MODE_ECPSWE;
- break;
- case 1: // hw- or sw-ecp
- if (port->modes & PARPORT_MODE_ECP)
- cam->ppmode = IEEE1284_MODE_ECP;
- else
- cam->ppmode = IEEE1284_MODE_ECPSWE;
- break;
- case 2: // hw- or sw-epp
- if (port->modes & PARPORT_MODE_EPP)
- cam->ppmode = IEEE1284_MODE_EPP;
- else
- cam->ppmode = IEEE1284_MODE_EPPSWE;
- break;
- case 3: // hw-ecp
- cam->ppmode = IEEE1284_MODE_ECP;
- break;
- }
- // Tell the parport driver that we exists
- cam->pdev = parport_register_device(
- port, W9966_DRIVERNAME, NULL, NULL, NULL, 0, NULL);
- if (cam->pdev == NULL) {
- DPRINTF("parport_register_device() failed.n");
- return 0;
- }
- w9966_flag_set(cam, W9966_STATE_PDEV);
- // Claim parport
- if (!w9966_pdev_claim(cam)) {
- DPRINTF("w9966_pdev_claim() failed.n");
- return 0;
- }
- // Perform initial w9966 setup
- if (!w9966_setup(cam)) {
- DPRINTF("w9966_setup() failed.n");
- return 0;
- }
- // Detect model
- if (!w9966_saa7111_init(cam)) {
- DPRINTF("w9966_saa7111_init() failed.n");
- return 0;
- }
- if (!w9966_lc99053_init(cam)) {
- DPRINTF("w9966_lc99053_init() failed.n");
- return 0;
- }
- if (!w9966_flag_test(cam, W9966_STATE_DETECTED)) {
- DPRINTF("Camera model not identified.n");
- return 0;
- }
- // Setup w9966 with a default capture mode (QCIF res.)
- if (!w9966_window(cam, 0, 0, 1023, 1023, 176, 144)) {
- DPRINTF("w9966_window() failed.n");
- return 0;
- }
- w9966_pdev_release(cam);
- // Fill in the video_device struct and register us to v4l
- memset(&cam->vdev, 0, sizeof(struct video_device));
- strcpy(cam->vdev.name, W9966_DRIVERNAME);
- cam->vdev.type = VID_TYPE_CAPTURE | VID_TYPE_SCALES;
- cam->vdev.hardware = VID_HARDWARE_W9966;
- cam->vdev.open = &w9966_v4l_open;
- cam->vdev.close = &w9966_v4l_close;
- cam->vdev.read = &w9966_v4l_read;
- cam->vdev.ioctl = &w9966_v4l_ioctl;
- cam->vdev.priv = (void*)cam;
- cam->vdev.owner = THIS_MODULE;
- if (video_register_device(&cam->vdev, VFL_TYPE_GRABBER, vidnr) == -1) {
- DPRINTF("video_register_device() failed (minor: %d).n", vidnr);
- return 0;
- }
- w9966_flag_set(cam, W9966_STATE_VDEV);
- // All ok
- printk("w9966: Found and initialized %s on %s.n",
- cam->name, cam->pport->name);
- return 1;
- }
- // Terminate everything gracefully
- static void w9966_term(struct w9966_dev* cam)
- {
- // Delete allocated buffer
- if (w9966_flag_test(cam, W9966_STATE_BUFFER))
- kfree(cam->buffer);
- // Unregister from v4l
- if (w9966_flag_test(cam, W9966_STATE_VDEV))
- video_unregister_device(&cam->vdev);
- // Terminate from IEEE1284 mode and unregister from parport
- if (w9966_flag_test(cam, W9966_STATE_PDEV)) {
- if (w9966_pdev_claim(cam))
- parport_negotiate(cam->pport, IEEE1284_MODE_COMPAT);
- w9966_pdev_release(cam);
- parport_unregister_device(cam->pdev);
- }
- cam->dev_state = 0x00;
- }
- // Do initial setup for the w9966 chip, init i2c bus, etc.
- // this is generic for all models
- // expects a claimed pdev
- // 1 on success, else 0
- static int w9966_setup(struct w9966_dev* cam)
- {
- const u8 i2c = cam->i2c_state = W9966_I2C_W_DATA | W9966_I2C_W_CLOCK;
- const u8 regs[] = {
- 0x40, // 0x13 - VEE control (raw 4:2:2)
- 0x00, 0x00, 0x00, // 0x14 - 0x16
- 0x00, // 0x17 - ???
- i2c, // 0x18 - Serial bus
- 0xff, // 0x19 - I/O port direction control
- 0xff, // 0x1a - I/O port data register
- 0x10 // 0x1b - ???
- };
- int i;
- DASSERT(w9966_flag_test(cam, W9966_STATE_CLAIMED));
- // Reset (ECP-fifo & serial-bus)
- if (!w9966_wreg(cam, 0x00, 0x03) ||
- !w9966_wreg(cam, 0x00, 0x00))
- return 0;
- // Write regs to w9966cf chip
- for (i = 0x13; i < 0x1c; i++)
- if (!w9966_wreg(cam, i, regs[i-0x13]))
- return 0;
- return 1;
- }
- // Find a good length for capture window (used both for W and H)
- // A bit ugly but pretty functional. The capture length
- // have to match the downscale
- static int w9966_findlen(int near, int size, int maxlen)
- {
- int bestlen = size;
- int besterr = abs(near - bestlen);
- int len;
- for(len = size+1; len < maxlen; len++)
- {
- int err;
- if ( ((64*size) %len) != 0)
- continue;
- err = abs(near - len);
- // Only continue as long as we keep getting better values
- if (err > besterr)
- break;
- besterr = err;
- bestlen = len;
- }
- return bestlen;
- }
- // Modify capture window (if necessary)
- // and calculate downscaling
- // 1 on success, else 0
- static int w9966_calcscale(int size, int min, int max, int* beg, int* end, u8* factor)
- {
- const int maxlen = max - min;
- const int len = *end - *beg + 1;
- const int newlen = w9966_findlen(len, size, maxlen);
- const int err = newlen - len;
- // Check for bad format
- if (newlen > maxlen || newlen < size)
- return 0;
- // Set factor (6 bit fixed)
- *factor = (64*size) / newlen;
- if (*factor == 64)
- *factor = 0x00; // downscale is disabled
- else
- *factor |= 0x80; // set downscale-enable bit
- // Modify old beginning and end
- *beg -= err / 2;
- *end += err - (err / 2);
- // Move window if outside borders
- if (*beg < min) {
- *end += min - *beg;
- *beg += min - *beg;
- }
- if (*end > max) {
- *beg -= *end - max;
- *end -= *end - max;
- }
- return 1;
- }
- // Setup the w9966 capture window and also set SRAM settings
- // expects a claimed pdev and detected camera model
- // 1 on success, else 0
- static int w9966_window(struct w9966_dev* cam, int x1, int y1, int x2, int y2, int w, int h)
- {
- unsigned int enh_s, enh_e;
- u8 scale_x, scale_y;
- u8 regs[0x13];
- int i;
- // Modify width and height to match capture window and SRAM
- w = MAX(W9966_WND_MIN_W, w);
- h = MAX(W9966_WND_MIN_H, h);
- w = MIN(cam->max_x - cam->min_x, w);
- h = MIN(cam->max_y - cam->min_y, h);
- w &= ~0x1;
- if (w*h*2 > cam->sramsize)
- h = cam->sramsize / (w*2);
- cam->width = w;
- cam->height = h;
- enh_s = 0;
- enh_e = w*h*2;
- // Calculate downscaling
- if (!w9966_calcscale(w, cam->min_x, cam->max_x, &x1, &x2, &scale_x) ||
- !w9966_calcscale(h, cam->min_y, cam->max_y, &y1, &y2, &scale_y))
- return 0;
- DPRINTF("%dx%d, x: %d<->%d, y: %d<->%d, sx: %d/64, sy: %d/64.n",
- w, h, x1, x2, y1, y2, scale_x&~0x80, scale_y&~0x80);
- // Setup registers
- regs[0x00] = 0x00; // Set normal operation
- regs[0x01] = cam->cmask; // Capture mode
- regs[0x02] = scale_y; // V-scaling
- regs[0x03] = scale_x; // H-scaling
- // Capture window
- regs[0x04] = (x1 & 0x0ff); // X-start (8 low bits)
- regs[0x05] = (x1 & 0x300)>>8; // X-start (2 high bits)
- regs[0x06] = (y1 & 0x0ff); // Y-start (8 low bits)
- regs[0x07] = (y1 & 0x300)>>8; // Y-start (2 high bits)
- regs[0x08] = (x2 & 0x0ff); // X-end (8 low bits)
- regs[0x09] = (x2 & 0x300)>>8; // X-end (2 high bits)
- regs[0x0a] = (y2 & 0x0ff); // Y-end (8 low bits)
- regs[0x0c] = cam->sramid; // SRAM layout
- // Enhancement layer
- regs[0x0d] = (enh_s& 0x000ff); // Enh. start (0-7)
- regs[0x0e] = (enh_s& 0x0ff00)>>8; // Enh. start (8-15)
- regs[0x0f] = (enh_s& 0x70000)>>16; // Enh. start (16-17/18??)
- regs[0x10] = (enh_e& 0x000ff); // Enh. end (0-7)
- regs[0x11] = (enh_e& 0x0ff00)>>8; // Enh. end (8-15)
- regs[0x12] = (enh_e& 0x70000)>>16; // Enh. end (16-17/18??)
- // Write regs to w9966cf chip
- for (i = 0x01; i < 0x13; i++)
- if (!w9966_wreg(cam, i, regs[i]))
- return 0;
- return 1;
- }
- // Detect and initialize saa7111 ccd-controller chip.
- // expects a claimed parport
- // expected to always return 1 unless error is _fatal_
- // 1 on success, else 0
- static int w9966_saa7111_init(struct w9966_dev* cam)
- {
- // saa7111 regs 0x00 trough 0x12
- const u8 regs[] = {
- 0x00, // not written
- 0x00, 0xd8, 0x23, 0x00, 0x80, 0x80, 0x00, 0x88, 0x10,
- cam->brightness, // 0x0a
- cam->contrast, // 0x0b
- cam->color, // 0x0c
- cam->hue, // 0x0d
- 0x01, 0x00, 0x48, 0x0c, 0x00,
- };
- int i;
- if (w9966_flag_test(cam, W9966_STATE_DETECTED))
- return 1;
- // Write regs to saa7111 chip
- for (i = 1; i < 0x13; i++)
- if (!w9966_i2c_wreg(cam, W9966_SAA7111_ID, i, regs[i]))
- return 1;
- // Read back regs
- for (i = 1; i < 0x13; i++)
- if (w9966_i2c_rreg(cam, W9966_SAA7111_ID, i) != regs[i])
- return 1;
- // Fill in model specific data
- cam->name = "Lifeview Flycam Supra";
- cam->sramsize = 128 << 10; // 128 kib
- cam->sramid = 0x02; // see w9966.pdf
- cam->cmask = 0x18; // normal polarity
- cam->min_x = 16; // empirically determined
- cam->max_x = 705;
- cam->min_y = 14;
- cam->max_y = 253;
- cam->image = &w9966_saa7111_image;
- DPRINTF("Found and initialized a saa7111 chip.n");
- w9966_flag_set(cam, W9966_STATE_DETECTED);
- return 1;
- }
- // Setup image properties (brightness, hue, etc.) for the saa7111 chip
- // expects a claimed parport
- // 1 on success, else 0
- static int w9966_saa7111_image(struct w9966_dev* cam)
- {
- if (!w9966_i2c_wreg(cam, W9966_SAA7111_ID, 0x0a, cam->brightness) ||
- !w9966_i2c_wreg(cam, W9966_SAA7111_ID, 0x0b, cam->contrast) ||
- !w9966_i2c_wreg(cam, W9966_SAA7111_ID, 0x0c, cam->color) ||
- !w9966_i2c_wreg(cam, W9966_SAA7111_ID, 0x0d, cam->hue))
- return 0;
- return 1;
- }
- // Detect and initialize lc99053 ccd-controller chip.
- // expects a claimed parport
- // this is currently a hack, no detection is done, we just assume an Eyestar2
- // 1 on success, else 0
- static int w9966_lc99053_init(struct w9966_dev* cam)
- {
- if (w9966_flag_test(cam, W9966_STATE_DETECTED))
- return 1;
- // Fill in model specific data
- cam->name = "Microtek Eyestar2";
- cam->sramsize = 128 << 10; // 128 kib
- cam->sramid = 0x02; // w9966cf.pdf
- cam->cmask = 0x10; // reverse polarity
- cam->min_x = 16; // empirically determined
- cam->max_x = 705;
- cam->min_y = 14;
- cam->max_y = 253;
- cam->image = &w9966_lc99053_image;
- DPRINTF("Found and initialized a lc99053 chip.n");
- w9966_flag_set(cam, W9966_STATE_DETECTED);
- return 1;
- }
- // Setup image properties (brightness, hue, etc.) for the lc99053 chip
- // expects a claimed parport
- // 1 on success, else 0
- static int w9966_lc99053_image(struct w9966_dev* cam)
- {
- return 1;
- }
- /*
- * Ugly and primitive i2c protocol functions
- */
- // Sets the data line on the i2c bus.
- // Expects a claimed pdev.
- static inline void w9966_i2c_setsda(struct w9966_dev* cam, int state)
- {
- if (state)
- cam->i2c_state |= W9966_I2C_W_DATA;
- else
- cam->i2c_state &= ~W9966_I2C_W_DATA;
- w9966_wreg(cam, 0x18, cam->i2c_state);
- udelay(W9966_I2C_UDELAY);
- }
- // Sets the clock line on the i2c bus.
- // Expects a claimed pdev.
- // 1 on success, else 0
- static inline int w9966_i2c_setscl(struct w9966_dev* cam, int state)
- {
- if (state)
- cam->i2c_state |= W9966_I2C_W_CLOCK;
- else
- cam->i2c_state &= ~W9966_I2C_W_CLOCK;
- w9966_wreg(cam, 0x18, cam->i2c_state);
- udelay(W9966_I2C_UDELAY);
- // when we go to high, we also expect the peripheral to ack.
- if (state) {
- const int timeout = jiffies + W9966_I2C_TIMEOUT;
- while (!w9966_i2c_getscl(cam)) {
- if (time_after(jiffies, timeout))
- return 0;
- }
- }
- return 1;
- }
- // Get peripheral data line
- // Expects a claimed pdev.
- static inline int w9966_i2c_getsda(struct w9966_dev* cam)
- {
- const u8 pins = w9966_rreg(cam, 0x18);
- return ((pins & W9966_I2C_R_DATA) > 0);
- }
- // Get peripheral clock line
- // Expects a claimed pdev.
- static inline int w9966_i2c_getscl(struct w9966_dev* cam)
- {
- const u8 pins = w9966_rreg(cam, 0x18);
- return ((pins & W9966_I2C_R_CLOCK) > 0);
- }
- // Write a byte with ack to the i2c bus.
- // Expects a claimed pdev.
- // 1 on success, else 0
- static int w9966_i2c_wbyte(struct w9966_dev* cam, int data)
- {
- int i;
- for (i = 7; i >= 0; i--) {
- w9966_i2c_setsda(cam, (data >> i) & 0x01);
- if (!w9966_i2c_setscl(cam, 1) ||
- !w9966_i2c_setscl(cam, 0))
- return 0;
- }
- w9966_i2c_setsda(cam, 1);
- if (!w9966_i2c_setscl(cam, 1) ||
- !w9966_i2c_setscl(cam, 0))
- return 0;
- return 1;
- }
- // Read a data byte with ack from the i2c-bus
- // Expects a claimed pdev. -1 on error
- static int w9966_i2c_rbyte(struct w9966_dev* cam)
- {
- u8 data = 0x00;
- int i;
- w9966_i2c_setsda(cam, 1);
- for (i = 0; i < 8; i++)
- {
- if (!w9966_i2c_setscl(cam, 1))
- return -1;
- data = data << 1;
- if (w9966_i2c_getsda(cam))
- data |= 0x01;
- w9966_i2c_setscl(cam, 0);
- }
- return data;
- }
- // Read a register from the i2c device.
- // Expects claimed pdev. -1 on error
- static int w9966_i2c_rreg(struct w9966_dev* cam, int device, int reg)
- {
- int data;
- w9966_i2c_setsda(cam, 0);
- w9966_i2c_setscl(cam, 0);
- if (!w9966_i2c_wbyte(cam, device << 1) ||
- !w9966_i2c_wbyte(cam, reg))
- return -1;
- w9966_i2c_setsda(cam, 1);
- if (!w9966_i2c_setscl(cam, 1))
- return -1;
- w9966_i2c_setsda(cam, 0);
- w9966_i2c_setscl(cam, 0);
- if (!w9966_i2c_wbyte(cam, (device << 1) | 1) ||
- (data = w9966_i2c_rbyte(cam)) == -1)
- return -1;
- w9966_i2c_setsda(cam, 0);
- if (!w9966_i2c_setscl(cam, 1))
- return -1;
- w9966_i2c_setsda(cam, 1);
- return data;
- }
- // Write a register to the i2c device.
- // Expects claimed pdev.
- // 1 on success, else 0
- static int w9966_i2c_wreg(struct w9966_dev* cam, int device, int reg, int data)
- {
- w9966_i2c_setsda(cam, 0);
- w9966_i2c_setscl(cam, 0);
- if (!w9966_i2c_wbyte(cam, device << 1) ||
- !w9966_i2c_wbyte(cam, reg) ||
- !w9966_i2c_wbyte(cam, data))
- return 0;
- w9966_i2c_setsda(cam, 0);
- if (!w9966_i2c_setscl(cam, 1))
- return 0;
- w9966_i2c_setsda(cam, 1);
- return 1;
- }
- /*
- * Video4linux interface
- */
- static int w9966_v4l_open(struct video_device *vdev, int flags)
- {
- struct w9966_dev *cam = (struct w9966_dev*)vdev->priv;
- // Claim parport
- if (!w9966_pdev_claim(cam)) {
- DPRINTF("Unable to claim parport");
- return -EFAULT;
- }
- // Allocate read buffer
- cam->buffer = (u8*)kmalloc(W9966_RBUFFER, GFP_KERNEL);
- if (cam->buffer == NULL) {
- w9966_pdev_release(cam);
- return -ENOMEM;
- }
- w9966_flag_set(cam, W9966_STATE_BUFFER);
- return 0;
- }
- static void w9966_v4l_close(struct video_device *vdev)
- {
- struct w9966_dev *cam = (struct w9966_dev*)vdev->priv;
- // Free read buffer
- if (w9966_flag_test(cam, W9966_STATE_BUFFER)) {
- kfree(cam->buffer);
- w9966_flag_clear(cam, W9966_STATE_BUFFER);
- }
- // release parport
- w9966_pdev_release(cam);
- }
- // expects a claimed parport
- static int w9966_v4l_ioctl(struct video_device *vdev, unsigned int cmd, void *arg)
- {
- struct w9966_dev *cam = (struct w9966_dev*)vdev->priv;
- switch(cmd)
- {
- case VIDIOCGCAP:
- {
- struct video_capability vcap = {
- W9966_DRIVERNAME, // name
- VID_TYPE_CAPTURE | VID_TYPE_SCALES, // type
- 1, 0, // vid, aud channels
- cam->max_x - cam->min_x,
- cam->max_y - cam->min_y,
- W9966_WND_MIN_W,
- W9966_WND_MIN_H
- };
- if(copy_to_user(arg, &vcap, sizeof(vcap)) != 0)
- return -EFAULT;
- return 0;
- }
- case VIDIOCGCHAN:
- {
- struct video_channel vch;
- if(copy_from_user(&vch, arg, sizeof(vch)) != 0)
- return -EFAULT;
- if(vch.channel != 0) // We only support one channel (#0)
- return -EINVAL;
- strcpy(vch.name, "CCD-input");
- vch.flags = 0; // We have no tuner or audio
- vch.tuners = 0;
- vch.type = VIDEO_TYPE_CAMERA;
- vch.norm = 0; // ???
- if(copy_to_user(arg, &vch, sizeof(vch)) != 0)
- return -EFAULT;
- return 0;
- }
- case VIDIOCSCHAN:
- {
- struct video_channel vch;
- if(copy_from_user(&vch, arg, sizeof(vch) ) != 0)
- return -EFAULT;
- if(vch.channel != 0)
- return -EINVAL;
- return 0;
- }
- case VIDIOCGTUNER:
- {
- struct video_tuner vtune;
- if(copy_from_user(&vtune, arg, sizeof(vtune)) != 0)
- return -EFAULT;
- if(vtune.tuner != 0);
- return -EINVAL;
- strcpy(vtune.name, "no tuner");
- vtune.rangelow = 0;
- vtune.rangehigh = 0;
- vtune.flags = VIDEO_TUNER_NORM;
- vtune.mode = VIDEO_MODE_AUTO;
- vtune.signal = 0xffff;
- if(copy_to_user(arg, &vtune, sizeof(vtune)) != 0)
- return -EFAULT;
- return 0;
- }
- case VIDIOCSTUNER:
- {
- struct video_tuner vtune;
- if (copy_from_user(&vtune, arg, sizeof(vtune)) != 0)
- return -EFAULT;
- if (vtune.tuner != 0)
- return -EINVAL;
- if (vtune.mode != VIDEO_MODE_AUTO)
- return -EINVAL;
- return 0;
- }
- case VIDIOCGPICT:
- {
- struct video_picture vpic = {
- cam->brightness << 8, // brightness
- (cam->hue + 128) << 8, // hue
- cam->color << 9, // color
- cam->contrast << 9, // contrast
- 0x8000, // whiteness
- 16, VIDEO_PALETTE_YUV422// bpp, palette format
- };
- if(copy_to_user(arg, &vpic, sizeof(vpic)) != 0)
- return -EFAULT;
- return 0;
- }
- case VIDIOCSPICT:
- {
- struct video_picture vpic;
- if(copy_from_user(&vpic, arg, sizeof(vpic)) != 0)
- return -EFAULT;
- if (vpic.depth != 16 || vpic.palette != VIDEO_PALETTE_YUV422)
- return -EINVAL;
- cam->brightness = vpic.brightness >> 8;
- cam->hue = (vpic.hue >> 8) - 128;
- cam->color = vpic.colour >> 9;
- cam->contrast = vpic.contrast >> 9;
- if (!cam->image(cam))
- return -EFAULT;
- return 0;
- }
- case VIDIOCSWIN:
- {
- struct video_window vwin;
- if (copy_from_user(&vwin, arg, sizeof(vwin)) != 0)
- return -EFAULT;
- if (
- vwin.flags != 0 ||
- vwin.clipcount != 0)
- return -EINVAL;
- if (vwin.width > cam->max_x - cam->min_x ||
- vwin.height > cam->max_y - cam->min_y ||
- vwin.width < W9966_WND_MIN_W ||
- vwin.height < W9966_WND_MIN_H)
- return -EINVAL;
- // Update camera regs
- if (!w9966_window(cam, 0, 0, 1023, 1023, vwin.width, vwin.height))
- return -EFAULT;
- return 0;
- }
- case VIDIOCGWIN:
- {
- struct video_window vwin;
- memset(&vwin, 0, sizeof(vwin));
- vwin.width = cam->width;
- vwin.height = cam->height;
- if(copy_to_user(arg, &vwin, sizeof(vwin)) != 0)
- return -EFAULT;
- return 0;
- }
- // Unimplemented
- case VIDIOCCAPTURE:
- case VIDIOCGFBUF:
- case VIDIOCSFBUF:
- case VIDIOCKEY:
- case VIDIOCGFREQ:
- case VIDIOCSFREQ:
- case VIDIOCGAUDIO:
- case VIDIOCSAUDIO:
- return -EINVAL;
- default:
- return -ENOIOCTLCMD;
- }
- return 0;
- }
- // Capture data
- // expects a claimed parport and allocated read buffer
- static long w9966_v4l_read(struct video_device *vdev, char *buf, unsigned long count, int noblock)
- {
- struct w9966_dev *cam = (struct w9966_dev *)vdev->priv;
- const u8 addr = 0xa0; // ECP, read, CCD-transfer, 00000
- u8* dest = (u8*)buf;
- unsigned long dleft = count;
- // Why would anyone want more than this??
- if (count > cam->width * cam->height * 2)
- count = cam->width * cam->height * 2;
- w9966_wreg(cam, 0x00, 0x02); // Reset ECP-FIFO buffer
- w9966_wreg(cam, 0x00, 0x00); // Return to normal operation
- w9966_wreg(cam, 0x01, cam->cmask | 0x80); // Enable capture
- // write special capture-addr and negotiate into data transfer
- if (parport_negotiate(cam->pport, cam->ppmode|IEEE1284_ADDR) != 0 ||
- parport_write(cam->pport, &addr, 1) != 1 ||
- parport_negotiate(cam->pport, cam->ppmode|IEEE1284_DATA) != 0) {
- DPRINTF("Unable to write capture-addr.n");
- return -EFAULT;
- }
- while(dleft > 0)
- {
- const size_t tsize = (dleft > W9966_RBUFFER) ? W9966_RBUFFER : dleft;
- if (parport_read(cam->pport, cam->buffer, tsize) < tsize)
- return -EFAULT;
- if (copy_to_user(dest, cam->buffer, tsize) != 0)
- return -EFAULT;
- dest += tsize;
- dleft -= tsize;
- }
- w9966_wreg(cam, 0x01, cam->cmask); // Disable capture
- return count;
- }
- // Called once for every parport on init
- static void w9966_attach(struct parport *port)
- {
- int i;
- for (i = 0; i < W9966_MAXCAMS; i++) {
- if (strcmp(pardev[i], "none") == 0 || // Skip if 'none' or if
- w9966_cams[i].dev_state != 0) // cam already assigned
- continue;
- if (strcmp(pardev[i], "auto") == 0 ||
- strcmp(pardev[i], port->name) == 0) {
- if (!w9966_init(&w9966_cams[i], port, video_nr[i]))
- w9966_term(&w9966_cams[i]);
- break; // return
- }
- }
- }
- // Called once for every parport on termination
- static void w9966_detach(struct parport *port)
- {
- int i;
- for (i = 0; i < W9966_MAXCAMS; i++)
- if (w9966_cams[i].dev_state != 0 && w9966_cams[i].pport == port)
- w9966_term(&w9966_cams[i]);
- }
- static struct parport_driver w9966_ppd = {
- W9966_DRIVERNAME,
- w9966_attach,
- w9966_detach,
- NULL
- };
- // Module entry point
- static int __init w9966_mod_init(void)
- {
- int i, err;
- w9966_cams = kmalloc(
- sizeof(struct w9966_dev) * W9966_MAXCAMS, GFP_KERNEL);
- if (!w9966_cams)
- return -ENOMEM;
- for (i = 0; i < W9966_MAXCAMS; i++)
- w9966_cams[i].dev_state = 0;
- // Register parport driver
- if ((err = parport_register_driver(&w9966_ppd)) != 0) {
- kfree(w9966_cams);
- w9966_cams = 0;
- return err;
- }
- return 0;
- }
- // Module cleanup
- static void __exit w9966_mod_term(void)
- {
- if (w9966_cams)
- kfree(w9966_cams);
- parport_unregister_driver(&w9966_ppd);
- }
- module_init(w9966_mod_init);
- module_exit(w9966_mod_term);