diff options
Diffstat (limited to 'drivers/media/video/w9966.c')
| -rw-r--r-- | drivers/media/video/w9966.c | 1149 |
1 files changed, 573 insertions, 576 deletions
diff --git a/drivers/media/video/w9966.c b/drivers/media/video/w9966.c index bf9bf650a317..635420d8d84a 100644 --- a/drivers/media/video/w9966.c +++ b/drivers/media/video/w9966.c @@ -1,7 +1,7 @@ /* Winbond w9966cf Webcam parport driver. - Version 0.32 + Version 0.33 Copyright (C) 2001 Jakob Kemi <jakob.kemi@post.utfors.se> @@ -57,10 +57,12 @@ #include <linux/module.h> #include <linux/init.h> #include <linux/delay.h> -#include <linux/videodev.h> +#include <linux/version.h> +#include <linux/videodev2.h> #include <linux/slab.h> #include <media/v4l2-common.h> #include <media/v4l2-ioctl.h> +#include <media/v4l2-device.h> #include <linux/parport.h> /*#define DEBUG*/ /* Undef me for production */ @@ -76,12 +78,12 @@ */ #define W9966_DRIVERNAME "W9966CF Webcam" -#define W9966_MAXCAMS 4 // Maximum number of cameras -#define W9966_RBUFFER 2048 // Read buffer (must be an even number) -#define W9966_SRAMSIZE 131072 // 128kb -#define W9966_SRAMID 0x02 // check w9966cf.pdf +#define W9966_MAXCAMS 4 /* Maximum number of cameras */ +#define W9966_RBUFFER 2048 /* Read buffer (must be an even number) */ +#define W9966_SRAMSIZE 131072 /* 128kb */ +#define W9966_SRAMID 0x02 /* check w9966cf.pdf */ -// Empirically determined window limits +/* Empirically determined window limits */ #define W9966_WND_MIN_X 16 #define W9966_WND_MIN_Y 14 #define W9966_WND_MAX_X 705 @@ -89,7 +91,7 @@ #define W9966_WND_MAX_W (W9966_WND_MAX_X - W9966_WND_MIN_X) #define W9966_WND_MAX_H (W9966_WND_MAX_Y - W9966_WND_MIN_Y) -// Keep track of our current state +/* Keep track of our current state */ #define W9966_STATE_PDEV 0x01 #define W9966_STATE_CLAIMED 0x02 #define W9966_STATE_VDEV 0x04 @@ -101,12 +103,13 @@ #define W9966_I2C_W_DATA 0x02 #define W9966_I2C_W_CLOCK 0x01 -struct w9966_dev { +struct w9966 { + struct v4l2_device v4l2_dev; unsigned char dev_state; unsigned char i2c_state; unsigned short ppmode; - struct parport* pport; - struct pardevice* pdev; + struct parport *pport; + struct pardevice *pdev; struct video_device vdev; unsigned short width; unsigned short height; @@ -114,7 +117,7 @@ struct w9966_dev { signed char contrast; signed char color; signed char hue; - unsigned long in_use; + struct mutex lock; }; /* @@ -127,15 +130,15 @@ MODULE_LICENSE("GPL"); #ifdef MODULE -static const char* pardev[] = {[0 ... W9966_MAXCAMS] = ""}; +static const char *pardev[] = {[0 ... W9966_MAXCAMS] = ""}; #else -static const char* pardev[] = {[0 ... W9966_MAXCAMS] = "aggressive"}; +static const char *pardev[] = {[0 ... W9966_MAXCAMS] = "aggressive"}; #endif module_param_array(pardev, charp, NULL, 0); -MODULE_PARM_DESC(pardev, "pardev: where to search for\n\ -\teach camera. 'aggressive' means brute-force search.\n\ -\tEg: >pardev=parport3,aggressive,parport2,parport1< would assign\n\ -\tcam 1 to parport3 and search every parport for cam 2 etc..."); +MODULE_PARM_DESC(pardev, "pardev: where to search for\n" + "\teach camera. 'aggressive' means brute-force search.\n" + "\tEg: >pardev=parport3,aggressive,parport2,parport1< would assign\n" + "\tcam 1 to parport3 and search every parport for cam 2 etc..."); static int parmode; module_param(parmode, int, 0); @@ -144,117 +147,49 @@ MODULE_PARM_DESC(parmode, "parmode: transfer mode (0=auto, 1=ecp, 2=epp"); static int video_nr = -1; module_param(video_nr, int, 0); -/* - * Private data - */ - -static struct w9966_dev w9966_cams[W9966_MAXCAMS]; - -/* - * Private function declares - */ - -static inline void w9966_setState(struct w9966_dev* cam, int mask, int val); -static inline int w9966_getState(struct w9966_dev* cam, int mask, int val); -static inline void 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); -#if 0 -static int w9966_rReg_i2c(struct w9966_dev* cam, int reg); -#endif -static int w9966_wReg_i2c(struct w9966_dev* cam, int reg, int data); -static int w9966_findlen(int near, int size, int maxlen); -static int w9966_calcscale(int size, int min, int max, int* beg, int* end, unsigned char* factor); -static int w9966_setup(struct w9966_dev* cam, int x1, int y1, int x2, int y2, int w, int h); - -static int w9966_init(struct w9966_dev* cam, struct parport* port); -static void w9966_term(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); -#if 0 -static int w9966_i2c_rbyte(struct w9966_dev* cam); -#endif - -static long w9966_v4l_ioctl(struct file *file, - unsigned int cmd, unsigned long arg); -static ssize_t w9966_v4l_read(struct file *file, char __user *buf, - size_t count, loff_t *ppos); - -static int w9966_exclusive_open(struct file *file) -{ - struct w9966_dev *cam = video_drvdata(file); - - return test_and_set_bit(0, &cam->in_use) ? -EBUSY : 0; -} - -static int w9966_exclusive_release(struct file *file) -{ - struct w9966_dev *cam = video_drvdata(file); - - clear_bit(0, &cam->in_use); - return 0; -} - -static const struct v4l2_file_operations w9966_fops = { - .owner = THIS_MODULE, - .open = w9966_exclusive_open, - .release = w9966_exclusive_release, - .ioctl = w9966_v4l_ioctl, - .read = w9966_v4l_read, -}; -static struct video_device w9966_template = { - .name = W9966_DRIVERNAME, - .fops = &w9966_fops, - .release = video_device_release_empty, -}; +static struct w9966 w9966_cams[W9966_MAXCAMS]; /* * Private function defines */ -// Set camera phase flags, so we know what to uninit when terminating -static inline void w9966_setState(struct w9966_dev* cam, int mask, int val) +/* Set camera phase flags, so we know what to uninit when terminating */ +static inline void w9966_set_state(struct w9966 *cam, int mask, int val) { cam->dev_state = (cam->dev_state & ~mask) ^ val; } -// Get camera phase flags -static inline int w9966_getState(struct w9966_dev* cam, int mask, int val) +/* Get camera phase flags */ +static inline int w9966_get_state(struct w9966 *cam, int mask, int val) { return ((cam->dev_state & mask) == val); } -// Claim parport for ourself -static inline void w9966_pdev_claim(struct w9966_dev* cam) +/* Claim parport for ourself */ +static void w9966_pdev_claim(struct w9966 *cam) { - if (w9966_getState(cam, W9966_STATE_CLAIMED, W9966_STATE_CLAIMED)) + if (w9966_get_state(cam, W9966_STATE_CLAIMED, W9966_STATE_CLAIMED)) return; parport_claim_or_block(cam->pdev); - w9966_setState(cam, W9966_STATE_CLAIMED, W9966_STATE_CLAIMED); + w9966_set_state(cam, W9966_STATE_CLAIMED, W9966_STATE_CLAIMED); } -// Release parport for others to use -static inline void w9966_pdev_release(struct w9966_dev* cam) +/* Release parport for others to use */ +static void w9966_pdev_release(struct w9966 *cam) { - if (w9966_getState(cam, W9966_STATE_CLAIMED, 0)) + if (w9966_get_state(cam, W9966_STATE_CLAIMED, 0)) return; parport_release(cam->pdev); - w9966_setState(cam, W9966_STATE_CLAIMED, 0); + w9966_set_state(cam, W9966_STATE_CLAIMED, 0); } -// 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) +/* Read register from W9966 interface-chip + Expects a claimed pdev + -1 on error, else register data (byte) */ +static int w9966_read_reg(struct w9966 *cam, int reg) { - // ECP, read, regtransfer, REG, REG, REG, REG, REG + /* ECP, read, regtransfer, REG, REG, REG, REG, REG */ const unsigned char addr = 0x80 | (reg & 0x1f); unsigned char val; @@ -270,12 +205,12 @@ static int w9966_rReg(struct w9966_dev* cam, int reg) return val; } -// Write register to W9966 interface-chip -// Expects a claimed pdev -// -1 on error -static int w9966_wReg(struct w9966_dev* cam, int reg, int data) +/* Write register to W9966 interface-chip + Expects a claimed pdev + -1 on error */ +static int w9966_write_reg(struct w9966 *cam, int reg, int data) { - // ECP, write, regtransfer, REG, REG, REG, REG, REG + /* ECP, write, regtransfer, REG, REG, REG, REG, REG */ const unsigned char addr = 0xc0 | (reg & 0x1f); const unsigned char val = data; @@ -291,119 +226,186 @@ static int w9966_wReg(struct w9966_dev* cam, int reg, int data) return 0; } -// 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 error -static int w9966_init(struct w9966_dev* cam, struct parport* port) +/* + * Ugly and primitive i2c protocol functions + */ + +/* Sets the data line on the i2c bus. + Expects a claimed pdev. */ +static void w9966_i2c_setsda(struct w9966 *cam, int state) { - if (cam->dev_state != 0) - return -1; + if (state) + cam->i2c_state |= W9966_I2C_W_DATA; + else + cam->i2c_state &= ~W9966_I2C_W_DATA; - cam->pport = port; - cam->brightness = 128; - cam->contrast = 64; - cam->color = 64; - cam->hue = 0; + w9966_write_reg(cam, 0x18, cam->i2c_state); + udelay(5); +} -// 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_ECP; - break; - case 1: // hw- or sw-ecp - cam->ppmode = IEEE1284_MODE_ECP; - break; - case 2: // hw- or sw-epp - cam->ppmode = IEEE1284_MODE_EPP; - break; +/* Get peripheral clock line + Expects a claimed pdev. */ +static int w9966_i2c_getscl(struct w9966 *cam) +{ + const unsigned char state = w9966_read_reg(cam, 0x18); + return ((state & W9966_I2C_R_CLOCK) > 0); +} + +/* Sets the clock line on the i2c bus. + Expects a claimed pdev. -1 on error */ +static int w9966_i2c_setscl(struct w9966 *cam, int state) +{ + unsigned long timeout; + + if (state) + cam->i2c_state |= W9966_I2C_W_CLOCK; + else + cam->i2c_state &= ~W9966_I2C_W_CLOCK; + + w9966_write_reg(cam, 0x18, cam->i2c_state); + udelay(5); + + /* we go to high, we also expect the peripheral to ack. */ + if (state) { + timeout = jiffies + 100; + while (!w9966_i2c_getscl(cam)) { + if (time_after(jiffies, timeout)) + return -1; + } } + return 0; +} -// Tell the parport driver that we exists - cam->pdev = parport_register_device(port, "w9966", NULL, NULL, NULL, 0, NULL); - if (cam->pdev == NULL) { - DPRINTF("parport_register_device() failed\n"); - return -1; +#if 0 +/* Get peripheral data line + Expects a claimed pdev. */ +static int w9966_i2c_getsda(struct w9966 *cam) +{ + const unsigned char state = w9966_read_reg(cam, 0x18); + return ((state & W9966_I2C_R_DATA) > 0); +} +#endif + +/* Write a byte with ack to the i2c bus. + Expects a claimed pdev. -1 on error */ +static int w9966_i2c_wbyte(struct w9966 *cam, int data) +{ + int i; + + for (i = 7; i >= 0; i--) { + w9966_i2c_setsda(cam, (data >> i) & 0x01); + + if (w9966_i2c_setscl(cam, 1) == -1) + return -1; + w9966_i2c_setscl(cam, 0); } - w9966_setState(cam, W9966_STATE_PDEV, W9966_STATE_PDEV); - w9966_pdev_claim(cam); + w9966_i2c_setsda(cam, 1); -// Setup a default capture mode - if (w9966_setup(cam, 0, 0, 1023, 1023, 200, 160) != 0) { - DPRINTF("w9966_setup() failed.\n"); + if (w9966_i2c_setscl(cam, 1) == -1) return -1; + w9966_i2c_setscl(cam, 0); + + return 0; +} + +/* Read a data byte with ack from the i2c-bus + Expects a claimed pdev. -1 on error */ +#if 0 +static int w9966_i2c_rbyte(struct w9966 *cam) +{ + unsigned char data = 0x00; + int i; + + w9966_i2c_setsda(cam, 1); + + for (i = 0; i < 8; i++) { + if (w9966_i2c_setscl(cam, 1) == -1) + return -1; + data = data << 1; + if (w9966_i2c_getsda(cam)) + data |= 0x01; + + w9966_i2c_setscl(cam, 0); } + return data; +} +#endif - w9966_pdev_release(cam); +/* Read a register from the i2c device. + Expects claimed pdev. -1 on error */ +#if 0 +static int w9966_read_reg_i2c(struct w9966 *cam, int reg) +{ + int data; -// Fill in the video_device struct and register us to v4l - memcpy(&cam->vdev, &w9966_template, sizeof(struct video_device)); - video_set_drvdata(&cam->vdev, cam); + w9966_i2c_setsda(cam, 0); + w9966_i2c_setscl(cam, 0); - if (video_register_device(&cam->vdev, VFL_TYPE_GRABBER, video_nr) < 0) + if (w9966_i2c_wbyte(cam, W9966_I2C_W_ID) == -1 || + w9966_i2c_wbyte(cam, reg) == -1) + return -1; + + w9966_i2c_setsda(cam, 1); + if (w9966_i2c_setscl(cam, 1) == -1) return -1; + w9966_i2c_setsda(cam, 0); + w9966_i2c_setscl(cam, 0); - w9966_setState(cam, W9966_STATE_VDEV, W9966_STATE_VDEV); + if (w9966_i2c_wbyte(cam, W9966_I2C_R_ID) == -1) + return -1; + data = w9966_i2c_rbyte(cam); + if (data == -1) + return -1; - // All ok - printk( - "w9966cf: Found and initialized a webcam on %s.\n", - cam->pport->name - ); - return 0; -} + w9966_i2c_setsda(cam, 0); + if (w9966_i2c_setscl(cam, 1) == -1) + return -1; + w9966_i2c_setsda(cam, 1); -// Terminate everything gracefully -static void w9966_term(struct w9966_dev* cam) + return data; +} +#endif + +/* Write a register to the i2c device. + Expects claimed pdev. -1 on error */ +static int w9966_write_reg_i2c(struct w9966 *cam, int reg, int data) { -// Unregister from v4l - if (w9966_getState(cam, W9966_STATE_VDEV, W9966_STATE_VDEV)) { - video_unregister_device(&cam->vdev); - w9966_setState(cam, W9966_STATE_VDEV, 0); - } + w9966_i2c_setsda(cam, 0); + w9966_i2c_setscl(cam, 0); -// Terminate from IEEE1284 mode and release pdev block - if (w9966_getState(cam, W9966_STATE_PDEV, W9966_STATE_PDEV)) { - w9966_pdev_claim(cam); - parport_negotiate(cam->pport, IEEE1284_MODE_COMPAT); - w9966_pdev_release(cam); - } + if (w9966_i2c_wbyte(cam, W9966_I2C_W_ID) == -1 || + w9966_i2c_wbyte(cam, reg) == -1 || + w9966_i2c_wbyte(cam, data) == -1) + return -1; -// Unregister from parport - if (w9966_getState(cam, W9966_STATE_PDEV, W9966_STATE_PDEV)) { - parport_unregister_device(cam->pdev); - w9966_setState(cam, W9966_STATE_PDEV, 0); - } -} + w9966_i2c_setsda(cam, 0); + if (w9966_i2c_setscl(cam, 1) == -1) + return -1; + + w9966_i2c_setsda(cam, 1); + return 0; +} -// 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 +/* 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++) - { + for (len = size + 1; len < maxlen; len++) { int err; - if ( ((64*size) %len) != 0) + if (((64 * size) % len) != 0) continue; err = abs(near - len); - // Only continue as long as we keep getting better values + /* Only continue as long as we keep getting better values */ if (err > besterr) break; @@ -414,32 +416,32 @@ static int w9966_findlen(int near, int size, int maxlen) return bestlen; } -// Modify capture window (if necessary) -// and calculate downscaling -// Return -1 on error -static int w9966_calcscale(int size, int min, int max, int* beg, int* end, unsigned char* factor) +/* Modify capture window (if necessary) + and calculate downscaling + Return -1 on error */ +static int w9966_calcscale(int size, int min, int max, int *beg, int *end, unsigned char *factor) { int maxlen = max - min; int len = *end - *beg + 1; int newlen = w9966_findlen(len, size, maxlen); int err = newlen - len; - // Check for bad format + /* Check for bad format */ if (newlen > maxlen || newlen < size) return -1; - // Set factor (6 bit fixed) - *factor = (64*size) / newlen; + /* Set factor (6 bit fixed) */ + *factor = (64 * size) / newlen; if (*factor == 64) - *factor = 0x00; // downscale is disabled + *factor = 0x00; /* downscale is disabled */ else - *factor |= 0x80; // set downscale-enable bit + *factor |= 0x80; /* set downscale-enable bit */ - // Modify old beginning and end + /* Modify old beginning and end */ *beg -= err / 2; *end += err - (err / 2); - // Move window if outside borders + /* Move window if outside borders */ if (*beg < min) { *end += min - *beg; *beg += min - *beg; @@ -452,10 +454,10 @@ static int w9966_calcscale(int size, int min, int max, int* beg, int* end, unsig return 0; } -// Setup the cameras capture window etc. -// Expects a claimed pdev -// return -1 on error -static int w9966_setup(struct w9966_dev* cam, int x1, int y1, int x2, int y2, int w, int h) +/* Setup the cameras capture window etc. + Expects a claimed pdev + return -1 on error */ +static int w9966_setup(struct w9966 *cam, int x1, int y1, int x2, int y2, int w, int h) { unsigned int i; unsigned int enh_s, enh_e; @@ -469,443 +471,314 @@ static int w9966_setup(struct w9966_dev* cam, int x1, int y1, int x2, int y2, in }; - if (w*h*2 > W9966_SRAMSIZE) - { + if (w * h * 2 > W9966_SRAMSIZE) { DPRINTF("capture window exceeds SRAM size!.\n"); - w = 200; h = 160; // Pick default values + w = 200; h = 160; /* Pick default values */ } w &= ~0x1; - if (w < 2) w = 2; - if (h < 1) h = 1; - if (w > W9966_WND_MAX_W) w = W9966_WND_MAX_W; - if (h > W9966_WND_MAX_H) h = W9966_WND_MAX_H; + if (w < 2) + w = 2; + if (h < 1) + h = 1; + if (w > W9966_WND_MAX_W) + w = W9966_WND_MAX_W; + if (h > W9966_WND_MAX_H) + h = W9966_WND_MAX_H; cam->width = w; cam->height = h; enh_s = 0; - enh_e = w*h*2; - -// Modify capture window if necessary and calculate downscaling - if ( - w9966_calcscale(w, W9966_WND_MIN_X, W9966_WND_MAX_X, &x1, &x2, &scale_x) != 0 || - w9966_calcscale(h, W9966_WND_MIN_Y, W9966_WND_MAX_Y, &y1, &y2, &scale_y) != 0 - ) return -1; - - 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] = 0x18; // 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] = W9966_SRAMID; // SRAM-banks (1x 128kb) - - // 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??) - - // Misc - regs[0x13] = 0x40; // VEE control (raw 4:2:2) - regs[0x17] = 0x00; // ??? - regs[0x18] = cam->i2c_state = 0x00; // Serial bus - regs[0x19] = 0xff; // I/O port direction control - regs[0x1a] = 0xff; // I/O port data register - regs[0x1b] = 0x10; // ??? - - // SAA7111 chip settings + enh_e = w * h * 2; + + /* Modify capture window if necessary and calculate downscaling */ + if (w9966_calcscale(w, W9966_WND_MIN_X, W9966_WND_MAX_X, &x1, &x2, &scale_x) != 0 || + w9966_calcscale(h, W9966_WND_MIN_Y, W9966_WND_MAX_Y, &y1, &y2, &scale_y) != 0) + return -1; + + 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] = 0x18; /* 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] = W9966_SRAMID; /* SRAM-banks (1x 128kb) */ + + /* 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??) */ + + /* Misc */ + regs[0x13] = 0x40; /* VEE control (raw 4:2:2) */ + regs[0x17] = 0x00; /* ??? */ + regs[0x18] = cam->i2c_state = 0x00; /* Serial bus */ + regs[0x19] = 0xff; /* I/O port direction control */ + regs[0x1a] = 0xff; /* I/O port data register */ + regs[0x1b] = 0x10; /* ??? */ + + /* SAA7111 chip settings */ saa7111_regs[0x0a] = cam->brightness; saa7111_regs[0x0b] = cam->contrast; saa7111_regs[0x0c] = cam->color; saa7111_regs[0x0d] = cam->hue; -// Reset (ECP-fifo & serial-bus) - if (w9966_wReg(cam, 0x00, 0x03) == -1) + /* Reset (ECP-fifo & serial-bus) */ + if (w9966_write_reg(cam, 0x00, 0x03) == -1) return -1; -// Write regs to w9966cf chip + /* Write regs to w9966cf chip */ for (i = 0; i < 0x1c; i++) - if (w9966_wReg(cam, i, regs[i]) == -1) + if (w9966_write_reg(cam, i, regs[i]) == -1) return -1; -// Write regs to saa7111 chip + /* Write regs to saa7111 chip */ for (i = 0; i < 0x20; i++) - if (w9966_wReg_i2c(cam, i, saa7111_regs[i]) == -1) + if (w9966_write_reg_i2c(cam, i, saa7111_regs[i]) == -1) return -1; return 0; } /* - * Ugly and primitive i2c protocol functions + * Video4linux interfacing */ -// Sets the data line on the i2c bus. -// Expects a claimed pdev. -static inline void w9966_i2c_setsda(struct w9966_dev* cam, int state) +static int cam_querycap(struct file *file, void *priv, + struct v4l2_capability *vcap) { - if (state) - cam->i2c_state |= W9966_I2C_W_DATA; - else - cam->i2c_state &= ~W9966_I2C_W_DATA; + struct w9966 *cam = video_drvdata(file); - w9966_wReg(cam, 0x18, cam->i2c_state); - udelay(5); + strlcpy(vcap->driver, cam->v4l2_dev.name, sizeof(vcap->driver)); + strlcpy(vcap->card, W9966_DRIVERNAME, sizeof(vcap->card)); + strlcpy(vcap->bus_info, "parport", sizeof(vcap->bus_info)); + vcap->version = KERNEL_VERSION(0, 33, 0); + vcap->capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_READWRITE; + return 0; } -// Get peripheral clock line -// Expects a claimed pdev. -static inline int w9966_i2c_getscl(struct w9966_dev* cam) +static int cam_enum_input(struct file *file, void *fh, struct v4l2_input *vin) { - const unsigned char state = w9966_rReg(cam, 0x18); - return ((state & W9966_I2C_R_CLOCK) > 0); + if (vin->index > 0) + return -EINVAL; + strlcpy(vin->name, "Camera", sizeof(vin->name)); + vin->type = V4L2_INPUT_TYPE_CAMERA; + vin->audioset = 0; + vin->tuner = 0; + vin->std = 0; + vin->status = 0; + return 0; } -// Sets the clock line on the i2c bus. -// Expects a claimed pdev. -1 on error -static inline int w9966_i2c_setscl(struct w9966_dev* cam, int state) +static int cam_g_input(struct file *file, void *fh, unsigned int *inp) { - unsigned long timeout; - - 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(5); - - // we go to high, we also expect the peripheral to ack. - if (state) { - timeout = jiffies + 100; - while (!w9966_i2c_getscl(cam)) { - if (time_after(jiffies, timeout)) - return -1; - } - } + *inp = 0; return 0; } -// Get peripheral data line -// Expects a claimed pdev. -static inline int w9966_i2c_getsda(struct w9966_dev* cam) +static int cam_s_input(struct file *file, void *fh, unsigned int inp) { - const unsigned char state = w9966_rReg(cam, 0x18); - return ((state & W9966_I2C_R_DATA) > 0); + return (inp > 0) ? -EINVAL : 0; } -// Write a byte with ack to the i2c bus. -// Expects a claimed pdev. -1 on error -static int w9966_i2c_wbyte(struct w9966_dev* cam, int data) +static int cam_queryctrl(struct file *file, void *priv, + struct v4l2_queryctrl *qc) { - int i; - for (i = 7; i >= 0; i--) - { - w9966_i2c_setsda(cam, (data >> i) & 0x01); - - if (w9966_i2c_setscl(cam, 1) == -1) - return -1; - w9966_i2c_setscl(cam, 0); + switch (qc->id) { + case V4L2_CID_BRIGHTNESS: + return v4l2_ctrl_query_fill(qc, 0, 255, 1, 128); + case V4L2_CID_CONTRAST: + return v4l2_ctrl_query_fill(qc, -64, 64, 1, 64); + case V4L2_CID_SATURATION: + return v4l2_ctrl_query_fill(qc, -64, 64, 1, 64); + case V4L2_CID_HUE: + return v4l2_ctrl_query_fill(qc, -128, 127, 1, 0); } - - w9966_i2c_setsda(cam, 1); - - if (w9966_i2c_setscl(cam, 1) == -1) - return -1; - w9966_i2c_setscl(cam, 0); - - return 0; + return -EINVAL; } -// Read a data byte with ack from the i2c-bus -// Expects a claimed pdev. -1 on error -#if 0 -static int w9966_i2c_rbyte(struct w9966_dev* cam) +static int cam_g_ctrl(struct file *file, void *priv, + struct v4l2_control *ctrl) { - unsigned char data = 0x00; - int i; - - w9966_i2c_setsda(cam, 1); + struct w9966 *cam = video_drvdata(file); + int ret = 0; - for (i = 0; i < 8; i++) - { - if (w9966_i2c_setscl(cam, 1) == -1) - return -1; - data = data << 1; - if (w9966_i2c_getsda(cam)) - data |= 0x01; - - w9966_i2c_setscl(cam, 0); + switch (ctrl->id) { + case V4L2_CID_BRIGHTNESS: + ctrl->value = cam->brightness; + break; + case V4L2_CID_CONTRAST: + ctrl->value = cam->contrast; + break; + case V4L2_CID_SATURATION: + ctrl->value = cam->color; + break; + case V4L2_CID_HUE: + ctrl->value = cam->hue; + break; + default: + ret = -EINVAL; + break; } - return data; + return ret; } -#endif -// Read a register from the i2c device. -// Expects claimed pdev. -1 on error -#if 0 -static int w9966_rReg_i2c(struct w9966_dev* cam, int reg) +static int cam_s_ctrl(struct file *file, void *priv, + struct v4l2_control *ctrl) { - int data; - - w9966_i2c_setsda(cam, 0); - w9966_i2c_setscl(cam, 0); - - if ( - w9966_i2c_wbyte(cam, W9966_I2C_W_ID) == -1 || - w9966_i2c_wbyte(cam, reg) == -1 - ) - return -1; - - w9966_i2c_setsda(cam, 1); - if (w9966_i2c_setscl(cam, 1) == -1) - return -1; - w9966_i2c_setsda(cam, 0); - w9966_i2c_setscl(cam, 0); + struct w9966 *cam = video_drvdata(file); + int ret = 0; - if ( - w9966_i2c_wbyte(cam, W9966_I2C_R_ID) == -1 || - (data = w9966_i2c_rbyte(cam)) == -1 - ) - return -1; + mutex_lock(&cam->lock); + switch (ctrl->id) { + case V4L2_CID_BRIGHTNESS: + cam->brightness = ctrl->value; + break; + case V4L2_CID_CONTRAST: + cam->contrast = ctrl->value; + break; + case V4L2_CID_SATURATION: + cam->color = ctrl->value; + break; + case V4L2_CID_HUE: + cam->hue = ctrl->value; + break; + default: + ret = -EINVAL; + break; + } - w9966_i2c_setsda(cam, 0); + if (ret == 0) { + w9966_pdev_claim(cam); - if (w9966_i2c_setscl(cam, 1) == -1) - return -1; - w9966_i2c_setsda(cam, 1); + if (w9966_write_reg_i2c(cam, 0x0a, cam->brightness) == -1 || + w9966_write_reg_i2c(cam, 0x0b, cam->contrast) == -1 || + w9966_write_reg_i2c(cam, 0x0c, cam->color) == -1 || + w9966_write_reg_i2c(cam, 0x0d, cam->hue) == -1) { + ret = -EIO; + } - return data; + w9966_pdev_release(cam); + } + mutex_unlock(&cam->lock); + return ret; } -#endif -// Write a register to the i2c device. -// Expects claimed pdev. -1 on error -static int w9966_wReg_i2c(struct w9966_dev* cam, int reg, int data) +static int cam_g_fmt_vid_cap(struct file *file, void *fh, struct v4l2_format *fmt) { - w9966_i2c_setsda(cam, 0); - w9966_i2c_setscl(cam, 0); - - if ( - w9966_i2c_wbyte(cam, W9966_I2C_W_ID) == -1 || - w9966_i2c_wbyte(cam, reg) == -1 || - w9966_i2c_wbyte(cam, data) == -1 - ) - return -1; - - w9966_i2c_setsda(cam, 0); - if (w9966_i2c_setscl(cam, 1) == -1) - return -1; - - w9966_i2c_setsda(cam, 1); - + struct w9966 *cam = video_drvdata(file); + struct v4l2_pix_format *pix = &fmt->fmt.pix; + + pix->width = cam->width; + pix->height = cam->height; + pix->pixelformat = V4L2_PIX_FMT_YUYV; + pix->field = V4L2_FIELD_NONE; + pix->bytesperline = 2 * cam->width; + pix->sizeimage = 2 * cam->width * cam->height; + /* Just a guess */ + pix->colorspace = V4L2_COLORSPACE_SMPTE170M; return 0; } -/* - * Video4linux interfacing - */ - -static long w9966_v4l_do_ioctl(struct file *file, unsigned int cmd, void *arg) -{ - struct w9966_dev *cam = video_drvdata(file); - - switch(cmd) - { - case VIDIOCGCAP: - { - static struct video_capability vcap = { - .name = W9966_DRIVERNAME, - .type = VID_TYPE_CAPTURE | VID_TYPE_SCALES, - .channels = 1, - .maxwidth = W9966_WND_MAX_W, - .maxheight = W9966_WND_MAX_H, - .minwidth = 2, - .minheight = 1, - }; - struct video_capability *cap = arg; - *cap = vcap; - return 0; - } - case VIDIOCGCHAN: - { - struct video_channel *vch = arg; - if(vch->channel != 0) // We only support one channel (#0) - return -EINVAL; - memset(vch,0,sizeof(*vch)); - strcpy(vch->name, "CCD-input"); - vch->type = VIDEO_TYPE_CAMERA; - return 0; - } - case VIDIOCSCHAN: - { - struct video_channel *vch = arg; - if(vch->channel != 0) - return -EINVAL; - return 0; - } - case VIDIOCGTUNER: - { - struct video_tuner *vtune = arg; - 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; - return 0; - } - case VIDIOCSTUNER: - { - struct video_tuner *vtune = arg; - 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 - }; - struct video_picture *pic = arg; - *pic = vpic; - return 0; - } - case VIDIOCSPICT: - { - struct video_picture *vpic = arg; - if (vpic->depth != 16 || (vpic->palette != VIDEO_PALETTE_YUV422 && vpic->palette != VIDEO_PALETTE_YUYV)) - return -EINVAL; - - cam->brightness = vpic->brightness >> 8; - cam->hue = (vpic->hue >> 8) - 128; - cam->color = vpic->colour >> 9; - cam->contrast = vpic->contrast >> 9; +static int cam_try_fmt_vid_cap(struct file *file, void *fh, struct v4l2_format *fmt) +{ + struct v4l2_pix_format *pix = &fmt->fmt.pix; + + if (pix->width < 2) + pix->width = 2; + if (pix->height < 1) + pix->height = 1; + if (pix->width > W9966_WND_MAX_W) + pix->width = W9966_WND_MAX_W; + if (pix->height > W9966_WND_MAX_H) + pix->height = W9966_WND_MAX_H; + pix->pixelformat = V4L2_PIX_FMT_YUYV; + pix->field = V4L2_FIELD_NONE; + pix->bytesperline = 2 * pix->width; + pix->sizeimage = 2 * pix->width * pix->height; + /* Just a guess */ + pix->colorspace = V4L2_COLORSPACE_SMPTE170M; + return 0; +} - w9966_pdev_claim(cam); +static int cam_s_fmt_vid_cap(struct file *file, void *fh, struct v4l2_format *fmt) +{ + struct w9966 *cam = video_drvdata(file); + struct v4l2_pix_format *pix = &fmt->fmt.pix; + int ret = cam_try_fmt_vid_cap(file, fh, fmt); - if ( - w9966_wReg_i2c(cam, 0x0a, cam->brightness) == -1 || - w9966_wReg_i2c(cam, 0x0b, cam->contrast) == -1 || - w9966_wReg_i2c(cam, 0x0c, cam->color) == -1 || - w9966_wReg_i2c(cam, 0x0d, cam->hue) == -1 - ) { - w9966_pdev_release(cam); - return -EIO; - } + if (ret) + return ret; - w9966_pdev_release(cam); - return 0; - } - case VIDIOCSWIN: - { - int ret; - struct video_window *vwin = arg; - - if (vwin->flags != 0) - return -EINVAL; - if (vwin->clipcount != 0) - return -EINVAL; - if (vwin->width < 2 || vwin->width > W9966_WND_MAX_W) - return -EINVAL; - if (vwin->height < 1 || vwin->height > W9966_WND_MAX_H) - return -EINVAL; - - // Update camera regs - w9966_pdev_claim(cam); - ret = w9966_setup(cam, 0, 0, 1023, 1023, vwin->width, vwin->height); - w9966_pdev_release(cam); + mutex_lock(&cam->lock); + /* Update camera regs */ + w9966_pdev_claim(cam); + ret = w9966_setup(cam, 0, 0, 1023, 1023, pix->width, pix->height); + w9966_pdev_release(cam); + mutex_unlock(&cam->lock); + return ret; +} - if (ret != 0) { - DPRINTF("VIDIOCSWIN: w9966_setup() failed.\n"); - return -EIO; - } +static int cam_enum_fmt_vid_cap(struct file *file, void *fh, struct v4l2_fmtdesc *fmt) +{ + static struct v4l2_fmtdesc formats[] = { + { 0, 0, 0, + "YUV 4:2:2", V4L2_PIX_FMT_YUYV, + { 0, 0, 0, 0 } + }, + }; + enum v4l2_buf_type type = fmt->type; - return 0; - } - case VIDIOCGWIN: - { - struct video_window *vwin = arg; - memset(vwin, 0, sizeof(*vwin)); - vwin->width = cam->width; - vwin->height = cam->height; - return 0; - } - // Unimplemented - case VIDIOCCAPTURE: - case VIDIOCGFBUF: - case VIDIOCSFBUF: - case VIDIOCKEY: - case VIDIOCGFREQ: - case VIDIOCSFREQ: - case VIDIOCGAUDIO: - case VIDIOCSAUDIO: + if (fmt->index > 0) return -EINVAL; - default: - return -ENOIOCTLCMD; - } - return 0; -} -static long w9966_v4l_ioctl(struct file *file, - unsigned int cmd, unsigned long arg) -{ - return video_usercopy(file, cmd, arg, w9966_v4l_do_ioctl); + *fmt = formats[fmt->index]; + fmt->type = type; + return 0; } -// Capture data +/* Capture data */ static ssize_t w9966_v4l_read(struct file *file, char __user *buf, - size_t count, loff_t *ppos) + size_t count, loff_t *ppos) { - struct w9966_dev *cam = video_drvdata(file); - unsigned char addr = 0xa0; // ECP, read, CCD-transfer, 00000 + struct w9966 *cam = video_drvdata(file); + unsigned char addr = 0xa0; /* ECP, read, CCD-transfer, 00000 */ unsigned char __user *dest = (unsigned char __user *)buf; unsigned long dleft = count; unsigned char *tbuf; - // Why would anyone want more than this?? + /* Why would anyone want more than this?? */ if (count > cam->width * cam->height * 2) return -EINVAL; + mutex_lock(&cam->lock); w9966_pdev_claim(cam); - w9966_wReg(cam, 0x00, 0x02); // Reset ECP-FIFO buffer - w9966_wReg(cam, 0x00, 0x00); // Return to normal operation - w9966_wReg(cam, 0x01, 0x98); // 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 ) - ) { + w9966_write_reg(cam, 0x00, 0x02); /* Reset ECP-FIFO buffer */ + w9966_write_reg(cam, 0x00, 0x00); /* Return to normal operation */ + w9966_write_reg(cam, 0x01, 0x98); /* 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)) { w9966_pdev_release(cam); + mutex_unlock(&cam->lock); return -EFAULT; } @@ -915,8 +788,7 @@ static ssize_t w9966_v4l_read(struct file *file, char __user *buf, goto out; } - while(dleft > 0) - { + while (dleft > 0) { unsigned long tsize = (dleft > W9966_RBUFFER) ? W9966_RBUFFER : dleft; if (parport_read(cam->pport, tbuf, tsize) < tsize) { @@ -931,43 +803,167 @@ static ssize_t w9966_v4l_read(struct file *file, char __user *buf, dleft -= tsize; } - w9966_wReg(cam, 0x01, 0x18); // Disable capture + w9966_write_reg(cam, 0x01, 0x18); /* Disable capture */ out: kfree(tbuf); w9966_pdev_release(cam); + mutex_unlock(&cam->lock); return count; } +static const struct v4l2_file_operations w9966_fops = { + .owner = THIS_MODULE, + .ioctl = video_ioctl2, + .read = w9966_v4l_read, +}; + +static const struct v4l2_ioctl_ops w9966_ioctl_ops = { + .vidioc_querycap = cam_querycap, + .vidioc_g_input = cam_g_input, + .vidioc_s_input = cam_s_input, + .vidioc_enum_input = cam_enum_input, + .vidioc_queryctrl = cam_queryctrl, + .vidioc_g_ctrl = cam_g_ctrl, + .vidioc_s_ctrl = cam_s_ctrl, + .vidioc_enum_fmt_vid_cap = cam_enum_fmt_vid_cap, + .vidioc_g_fmt_vid_cap = cam_g_fmt_vid_cap, + .vidioc_s_fmt_vid_cap = cam_s_fmt_vid_cap, + .vidioc_try_fmt_vid_cap = cam_try_fmt_vid_cap, +}; + -// Called once for every parport on init +/* 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 error */ +static int w9966_init(struct w9966 *cam, struct parport *port) +{ + struct v4l2_device *v4l2_dev = &cam->v4l2_dev; + + if (cam->dev_state != 0) + return -1; + + strlcpy(v4l2_dev->name, "w9966", sizeof(v4l2_dev->name)); + + if (v4l2_device_register(NULL, v4l2_dev) < 0) { + v4l2_err(v4l2_dev, "Could not register v4l2_device\n"); + return -1; + } + 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_ECP; + break; + case 1: /* hw- or sw-ecp */ + cam->ppmode = IEEE1284_MODE_ECP; + break; + case 2: /* hw- or sw-epp */ + cam->ppmode = IEEE1284_MODE_EPP; + break; + } + + /* Tell the parport driver that we exists */ + cam->pdev = parport_register_device(port, "w9966", NULL, NULL, NULL, 0, NULL); + if (cam->pdev == NULL) { + DPRINTF("parport_register_device() failed\n"); + return -1; + } + w9966_set_state(cam, W9966_STATE_PDEV, W9966_STATE_PDEV); + + w9966_pdev_claim(cam); + + /* Setup a default capture mode */ + if (w9966_setup(cam, 0, 0, 1023, 1023, 200, 160) != 0) { + DPRINTF("w9966_setup() failed.\n"); + return -1; + } + + w9966_pdev_release(cam); + + /* Fill in the video_device struct and register us to v4l */ + strlcpy(cam->vdev.name, W9966_DRIVERNAME, sizeof(cam->vdev.name)); + cam->vdev.v4l2_dev = v4l2_dev; + cam->vdev.fops = &w9966_fops; + cam->vdev.ioctl_ops = &w9966_ioctl_ops; + cam->vdev.release = video_device_release_empty; + video_set_drvdata(&cam->vdev, cam); + + mutex_init(&cam->lock); + + if (video_register_device(&cam->vdev, VFL_TYPE_GRABBER, video_nr) < 0) + return -1; + + w9966_set_state(cam, W9966_STATE_VDEV, W9966_STATE_VDEV); + + /* All ok */ + v4l2_info(v4l2_dev, "Found and initialized a webcam on %s.\n", + cam->pport->name); + return 0; +} + + +/* Terminate everything gracefully */ +static void w9966_term(struct w9966 *cam) +{ + /* Unregister from v4l */ + if (w9966_get_state(cam, W9966_STATE_VDEV, W9966_STATE_VDEV)) { + video_unregister_device(&cam->vdev); + w9966_set_state(cam, W9966_STATE_VDEV, 0); + } + + /* Terminate from IEEE1284 mode and release pdev block */ + if (w9966_get_state(cam, W9966_STATE_PDEV, W9966_STATE_PDEV)) { + w9966_pdev_claim(cam); + parport_negotiate(cam->pport, IEEE1284_MODE_COMPAT); + w9966_pdev_release(cam); + } + + /* Unregister from parport */ + if (w9966_get_state(cam, W9966_STATE_PDEV, W9966_STATE_PDEV)) { + parport_unregister_device(cam->pdev); + w9966_set_state(cam, W9966_STATE_PDEV, 0); + } +} + + +/* Called once for every parport on init */ static void w9966_attach(struct parport *port) { int i; - for (i = 0; i < W9966_MAXCAMS; i++) - { - if (w9966_cams[i].dev_state != 0) // Cam is already assigned + for (i = 0; i < W9966_MAXCAMS; i++) { + if (w9966_cams[i].dev_state != 0) /* Cam is already assigned */ continue; - if ( - strcmp(pardev[i], "aggressive") == 0 || - strcmp(pardev[i], port->name) == 0 - ) { + if (strcmp(pardev[i], "aggressive") == 0 || strcmp(pardev[i], port->name) == 0) { if (w9966_init(&w9966_cams[i], port) != 0) - w9966_term(&w9966_cams[i]); - break; // return + w9966_term(&w9966_cams[i]); + break; /* return */ } } } -// Called once for every parport on termination +/* 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]); + if (w9966_cams[i].dev_state != 0 && w9966_cams[i].pport == port) + w9966_term(&w9966_cams[i]); } @@ -977,17 +973,18 @@ static struct parport_driver w9966_ppd = { .detach = w9966_detach, }; -// Module entry point +/* Module entry point */ static int __init w9966_mod_init(void) { int i; + for (i = 0; i < W9966_MAXCAMS; i++) w9966_cams[i].dev_state = 0; return parport_register_driver(&w9966_ppd); } -// Module cleanup +/* Module cleanup */ static void __exit w9966_mod_term(void) { parport_unregister_driver(&w9966_ppd); |