/* * linux/arch/mips/au1000/db1x00/mirage_ts.c * * BRIEF MODULE DESCRIPTION *	Glue between Mirage board-specific touchscreen pieces *	and generic Wolfson Codec touchscreen support. * *	Based on pb1100_ts.c used in Hydrogen II. * * Copyright (c) 2003 Embedded Edge, LLC *		dan@embeddededge.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  SOFTWARE  IS PROVIDED	  ``AS	IS'' AND   ANY	EXPRESS OR IMPLIED *  WARRANTIES,	  INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN *  NO	EVENT  SHALL   THE AUTHOR  BE	 LIABLE FOR ANY	  DIRECT, INDIRECT, *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT *  NOT LIMITED	  TO, PROCUREMENT OF  SUBSTITUTE GOODS	OR SERVICES; LOSS OF *  USE, DATA,	OR PROFITS; OR	BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON *  ANY THEORY OF LIABILITY, WHETHER IN	 CONTRACT, STRICT LIABILITY, OR TORT *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * *  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. */#include <linux/config.h>#include <linux/types.h>#include <linux/module.h>#include <linux/sched.h>#include <linux/kernel.h>#include <linux/init.h>#include <linux/fs.h>#include <linux/poll.h>#include <linux/proc_fs.h>#include <linux/smp.h>#include <linux/smp_lock.h>#include <asm/segment.h>#include <asm/irq.h>#include <asm/uaccess.h>#include <asm/delay.h>#include <asm/au1000.h>/* *  Imported interface to Wolfson Codec driver. */extern void *wm97xx_ts_get_handle(int which);extern int wm97xx_ts_ready(void* ts_handle);extern void wm97xx_ts_set_cal(void* ts_handle, int xscale, int xtrans, int yscale, int ytrans);extern u16 wm97xx_ts_get_ac97(void* ts_handle, u8 reg);extern void wm97xx_ts_set_ac97(void* ts_handle, u8 reg, u16 val);extern int wm97xx_ts_read_data(void* ts_handle, long* x, long* y, long* pressure);extern void wm97xx_ts_send_data(void* ts_handle, long x, long y, long z);int wm97xx_comodule_present = 1;#define TS_NAME "mirage_ts"#define err(format, arg...) printk(KERN_ERR TS_NAME ": " format "\n" , ## arg)#define info(format, arg...) printk(KERN_INFO TS_NAME ": " format "\n" , ## arg)#define warn(format, arg...) printk(KERN_WARNING TS_NAME ": " format "\n" , ## arg)#define DPRINTK(format, arg...) printk(__FUNCTION__ ": " format "\n" , ## arg)#define PEN_DOWN_IRQ	AU1000_GPIO_7static struct task_struct *ts_task = 0;static DECLARE_COMPLETION(ts_complete);static DECLARE_WAIT_QUEUE_HEAD(pendown_wait);#ifdef CONFIG_WM97XX_FIVEWIRETSstatic int release_pressure = 1;#elsestatic int release_pressure = 50;#endiftypedef struct {   long x;   long y;} DOWN_EVENT;#define SAMPLE_RATE	50	/* samples per second */#define PEN_DEBOUNCE	5	/* samples for settling - fn of SAMPLE_RATE */#define PEN_UP_TIMEOUT	10	/* in seconds */#define PEN_UP_SETTLE	5	/* samples per second */static struct {	int xscale;	int xtrans;	int yscale;	int ytrans;} mirage_ts_cal ={#if 0	xscale:   84,	xtrans: -157,	yscale:   66,	ytrans: -150,#else	xscale:   84,	xtrans: -150,	yscale:   66,	ytrans: -146,#endif};static void pendown_irq(int irqnr, void *devid, struct pt_regs *regs){//DPRINTK("got one 0x%x", au_readl(SYS_PINSTATERD));	wake_up(&pendown_wait);}static int ts_thread(void *id){	static int pen_was_down = 0;	static DOWN_EVENT pen_xy;	long x, y, z;	void *ts;	/* handle */	struct task_struct *tsk = current;	int timeout = HZ / SAMPLE_RATE;	ts_task = tsk;	daemonize();	tsk->tty = NULL;	tsk->policy = SCHED_FIFO;	tsk->rt_priority = 1;	strcpy(tsk->comm, "touchscreen");	/* only want to receive SIGKILL */	spin_lock_irq(&tsk->sigmask_lock);	siginitsetinv(&tsk->blocked, sigmask(SIGKILL));	recalc_sigpending(tsk);	spin_unlock_irq(&tsk->sigmask_lock);	/* get handle for codec */	ts = wm97xx_ts_get_handle(0);	/* proceed only after everybody is ready */	while ( ! wm97xx_ts_ready(ts) ) {		/* give a little time for initializations to complete */		interruptible_sleep_on_timeout(&pendown_wait, HZ / 4);	}	/* board-specific calibration */	wm97xx_ts_set_cal(ts,			mirage_ts_cal.xscale,			mirage_ts_cal.xtrans,			mirage_ts_cal.yscale,			mirage_ts_cal.ytrans);	/* route Wolfson pendown interrupts to our GPIO */	au_sync();	wm97xx_ts_set_ac97(ts, 0x4c, wm97xx_ts_get_ac97(ts, 0x4c) & ~0x0008);	au_sync();	wm97xx_ts_set_ac97(ts, 0x56, wm97xx_ts_get_ac97(ts, 0x56) & ~0x0008);	au_sync();	wm97xx_ts_set_ac97(ts, 0x52, wm97xx_ts_get_ac97(ts, 0x52) | 0x2008);	au_sync();	for (;;) {		interruptible_sleep_on_timeout(&pendown_wait, timeout);		disable_irq(PEN_DOWN_IRQ);		if (signal_pending(tsk)) {			break;		}		/* read codec */		if (!wm97xx_ts_read_data(ts, &x, &y, &z))			z = 0;	/* treat no-data and pen-up the same */		if (signal_pending(tsk)) {			break;		}		if (z >= release_pressure) {			y = ~y;	/* top to bottom */			if (pen_was_down > 1 /*&& pen_was_down < PEN_DEBOUNCE*/) {//THXXX				/* bounce ? */				x = pen_xy.x;				y = pen_xy.y;				--pen_was_down;			} else if (pen_was_down <= 1) {				pen_xy.x = x;				pen_xy.y = y;				if (pen_was_down)					wm97xx_ts_send_data(ts, x, y, z);				pen_was_down = PEN_DEBOUNCE;			}			//wm97xx_ts_send_data(ts, x, y, z);			timeout = HZ / SAMPLE_RATE;		} else {			if (pen_was_down) {				if (--pen_was_down)					z = release_pressure;				else //THXXX				wm97xx_ts_send_data(ts, pen_xy.x, pen_xy.y, z);			}			/* The pendown signal takes some time to settle after			 * reading the pen pressure so wait a little			 * before enabling the pen.			 */			if (! pen_was_down) {//				interruptible_sleep_on_timeout(&pendown_wait, HZ / PEN_UP_SETTLE);				timeout = HZ * PEN_UP_TIMEOUT;			}		}		enable_irq(PEN_DOWN_IRQ);	}	enable_irq(PEN_DOWN_IRQ);	ts_task = NULL;	complete(&ts_complete);	return 0;}static int __init ts_mirage_init(void){	int ret;	/* pen down signal is connected to GPIO 7 */	ret = request_irq(PEN_DOWN_IRQ, pendown_irq, 0, "ts-pendown", NULL);	if (ret) {		err("unable to get pendown irq%d: [%d]", PEN_DOWN_IRQ, ret);		return ret;	}	lock_kernel();	ret = kernel_thread(ts_thread, NULL, CLONE_FS | CLONE_FILES);	if (ret < 0) {		unlock_kernel();		return ret;	}	unlock_kernel();	info("Mirage touchscreen IRQ initialized.");	return 0;}static void __exit ts_mirage_exit(void){	if (ts_task) {		send_sig(SIGKILL, ts_task, 1);		wait_for_completion(&ts_complete);	}	free_irq(PEN_DOWN_IRQ, NULL);}module_init(ts_mirage_init);module_exit(ts_mirage_exit);