mc68328digi.c

老外写的触摸屏驱动程序

/*----------------------------------------------------------------------------*/
/* mc68328digi.c,v 1.2 2001/02/12 11:14:10 pney Exp
 *
 * linux/drivers/char/mc68328digi.c - Touch screen driver.
 *
 * Author: Philippe Ney <[e-mail]>
 * Copyright (C) 2001 SMARTDATA <www.smartdata.ch>
 *
 * 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.
 *
 * Thanks to:
 *    Kenneth Albanowski for is first work on a touch screen driver.
 *    Alessandro Rubini for is "Linux device drivers" book.
 *    Ori Pomerantz for is "Linux Kernel Module Programming" guide.
 *
 * Updates:
 *   2001-03-07 Pascal bauermeister <[e-mail]>
 *              - Adapted to work ok on xcopilot; yet untested on real Palm.
 *              - Added check for version in ioctl()
 *
 *   2001-03-21 Pascal bauermeister <[e-mail]>
 *              - bypass real hw uninits for xcopilot. Now xcopilot is
 *                happy. It even no longer generates pen irq while this
 *                irq is disabled (I'd like to understand why, so that
 *                I can do the same in mc68328digi_init() !).
 *
 *   2001-10-23 Daniel Potts <[e-mail]>
 *              - support for uCdimm/68VZ328. I use SPI 2 which maps to the
 *                same addresses as for 68EZ328 and requries less changes to
 *                the code. For CS I use PF_A22; CSD0/CAS0 is not made 
 *                available off the uCdimm.
 *                PF1 (/IRQ5) is already used on uCdimm by the ethernet
 *                controller. We use /IRQ6 instead (PD7).
 *              - kill_fasync and request_irq fixes for 2.4.x (only) support.
 *
 *
 * Hardware:      Motorola MC68EZ328 DragonBall-EZ
 *                Burr-Brown ADS7843 Touch Screen Controller
 *                Rikei REW-A1 Touch Screen
 *
 * OS:            uClinux version 2.0.38.1pre3
 *
 * Connectivity:  Burr-Brown        DragonBall
 *                PENIRQ     ---->  PD7  &  PD4 (with a 100k resistor)
 *          //      BUSY       ---->  PF5  //changed by duwei 06/02/2003
 *           //     CS         ---->  PB4   //changed by duwei 06/02/2003
 *                DIN        ---->  PE0
 *                DOUT       ---->  PE1
 *                DCLK       ---->  PE2
 * There are some changed in the current platform: by duwei 03/20/2003
 *     ADS7843: /PENIRQ ----+----[100k resistor]---- : VCC
 *                          |
 *					+----------------------- VZ328: /IRQ6(PD7)
 * States graph:
 *
 *         ELAPSED & PEN_UP
 *         (re-init)             +------+
 *     +------------------------>| IDLE |<------+
 *     |                         +------+       |
 *     |                           |            | ELAPSED
 *     |  +------------------------+            | (re-init)
 *     |  |       PEN_IRQ                       |
 *     |  |       (disable pen_irq)             | 
 *     |  |       (enable & set timer)          | 
 *     |  |                                     |
 *     | \/                                     |
 *   +------+                                   |
 *   | WAIT |                                   |
 *   +------+                                   |
 *   /\   |                                     | 
 *   |    |             +---------------+-------+------+---------------+
 *   |    |             |               |              |               |
 *   |    |             |               |              |               |
 *   |    |        +--------+      +-------+      +--------+      +--------+
 *   |    +------->| ASK X  |      | ASK Y |      | READ X |      | READ Y |
 *   |  ELAPSED &  +--------+      +-------+      +--------+      +--------+
 *   |  PEN_DOWN       |           /\    |         /\    |         /\    |
 *   |  (init SPIM)    +-----------'     +---------'     +---------'     |
 *   |  (set timer)    XCH_COMPLETE      XCH_COMPLETE    XCH_COMPLETE    |
 *   |                                                                   |
 *   |                                                                   |
 *   |                                                                   |
 *   +-------------------------------------------------------------------+
 *                               XCH_COMPLETE
 *                               (release SPIM)
 *                               (set timer)
 *
 *
 * Remarks: I added some stuff for port on 2.2 and 2.4 kernels but currently
 *          this version works only on 2.0 because not tested on 2.4 yet.
 *          Someone interested?
 *
 */
/*----------------------------------------------------------------------------*/

#include <linux/kernel.h>     /* We're doing kernel work */
#include <linux/module.h>     /* Specifically, a module */
#include <linux/interrupt.h>  /* We want interrupts */

#include <linux/miscdevice.h> /* for misc_register() and misc_deregister() */

#include <linux/fs.h>         /* for struct 'file_operations' */

#include <linux/timer.h>     /* for timeout interrupts */
#include <linux/param.h>     /* for HZ. HZ = 100 and the timer step is 1/100 */
#include <linux/sched.h>     /* for jiffies definition. jiffies is incremented
                              * once for each clock tick; thus it's incremented
			      * HZ times per secondes.*/
#include <linux/mm.h>        /* for verify_area */
//#include <linux/malloc.h>    /* for kmalloc *///changed by duwei 03/19/2003
#include <linux/slab.h>    /* for kmalloc */
#include <linux/init.h>

#include <asm/irq.h>         /* For IRQ_MACHSPEC */

/*----------------------------------------------------------------------------*/
/*----------------------------define------------------------------------------*/
#define CONFIG_M68VZ328 1
#define CONFIG_UCDIMM   1  //added by duwei 03/21/2003
/*----------------------------------------------------------------------------*/

#if defined(CONFIG_M68328)
/* These are missing in MC68328.h. I took them from MC68EZ328.h temporarily,
 * but did not dare modifying MC68328.h yet (don't want to break things and
 * have no time now to do regression testings)
 *   - Pascal Bauermeister
 */
#define ICR_ADDR        0xfffff302
#define ICR_POL5        0x0080  /* Polarity Control for IRQ5 */
#define IMR_MIRQ5       (1 << IRQ5_IRQ_NUM)     /* Mask IRQ5 */
#define IRQ5_IRQ_NUM    20      /* IRQ5 */
#define PBPUEN          BYTE_REF(PBPUEN_ADDR)
#define PBPUEN_ADDR     0xfffff40a              /* Port B Pull-Up enable reg */
#define PB_CSD0_CAS0    0x10    /* Use CSD0/CAS0 as PB[4] */
#define PDSEL           BYTE_REF(PDSEL_ADDR)
#define PDSEL_ADDR      0xfffff41b              /* Port D Select Register */
#define PD_IRQ1         0x10    /* Use IRQ1 as PD[4] */
#define PF_A22          0x20    /* Use A22       as PF[5] */
#define PF_IRQ5         0x02    /* Use IRQ5      as PF[1] */
#define SPIMCONT        WORD_REF(SPIMCONT_ADDR)
#define SPIMCONT_ADDR   0xfffff802
#define SPIMCONT_SPIMEN         SPIMCONT_RSPIMEN

#elif defined(CONFIG_M68EZ328)
# include <asm/MC68EZ328.h>  /* bus, port and irq definition of DragonBall EZ */
#elif defined(CONFIG_M68VZ328)
# include <asm/MC68VZ328.h>
#else
# error "mc68328digi: a known machine not defined."
#endif

//#include <linux/mc68328digi.h>
#include "mc68328digi.h"  //added by duwei 03/19/2003

/*----------------------------------------------------------------------------*/
/* Debug */

#if 0
#if 0
# define DPRINTK printk("%0: [%03d,%03d] ", __file__, \
                        current_pos.x, current_pos.y); \
                        printk
#else
# define DPRINTK __dummy__
  static void __dummy__(const char* fmt, ...) {}
#endif
#endif
/*----------------------------------------------------------------------------*/

static const char* __file__ = __FILE__;

/*----------------------------------------------------------------------------*//*
 * Kernel compatibility.
 * Kernel > 2.2.3, include/linux/version.h contain a macro for KERNEL_VERSION
 */
#include <linux/version.h>
#ifndef KERNEL_VERSION
#define KERNEL_VERSION(a,b,c)  (((a) << 16) + ((b) << 8) + (c))
#endif

/*
 * Conditional compilation. LINUX_VERSION_CODE is the code of this version
 * (as per KERNEL_VERSION)
 */
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,2,0))
#include <asm/uaccess.h>    /* for put_user     */
#include <linux/poll.h>     /* for polling fnct */
#endif

/*
 * time limit 
 * Used for a whole conversion (x & y) and to clock the Burr-Brown to fall the
 * BUSY signal down (otherwise, pen cannot generate irq anymore).
 * If this limit run out, an error is generated. In the first case, the driver
 * could recover his normal state. In the second, the BUSY signal cannot be
 * fallen down and the device have to be reseted.
 * This limit is defined as approximatively the double of the deglitch one.
 */
#define CONV_TIME_LIMIT    50      /* ms */

/* 
 * Length of the data structure
 */
#define DATA_LENGTH       sizeof(struct ts_pen_info)

/*
 * Size of the buffer for the event queue
 */
#define TS_BUF_SIZE        32*DATA_LENGTH

/*
 * Minor number for the touch screen device. Major is 10 because of the misc 
 * type of the driver.
 */
#define MC68328DIGI_MINOR    9

/*
 * SPIMCONT fields for this app (not defined in asm/MC68EZ328.h).
 */
#define SPIMCONT_DATARATE ( 7 <<SPIMCONT_DATA_RATE_SHIFT)/* SPICLK = CLK / 512 */
#define SPIMCONT_BITCOUNT (15<< 0)                      /* 16 bits transfert  */

/*
 * SPIMCONT used values.
 */
#define SPIMCONT_INIT (SPIMCONT_DATARATE    | \
                       SPIMCONT_ENABLE      | \
                       SPIMCONT_XCH      *0 | \
                       SPIMCONT_IRQ      *0 | \
                       SPIMCONT_IRQEN       | \
                       SPIMCONT_PHA         | \
                       SPIMCONT_POL         | \
                       SPIMCONT_BITCOUNT      )

/*
 * ADS7843 fields (BURR-BROWN Touch Screen Controller).
 */
#define ADS7843_START_BIT (1<<7)
#define ADS7843_A2        (1<<6)
#define ADS7843_A1        (1<<5)
#define ADS7843_A0        (1<<4)
#define ADS7843_MODE      (1<<3)  /* HIGH = 8, LOW = 12 bits conversion */
#define ADS7843_SER_DFR   (1<<2)  /* LOW = differential mode            */
#define ADS7843_PD1       (1<<1)  /* PD1,PD0 = 11  PENIRQ disable       */
#define ADS7843_PD0       (1<<0)  /* PD1,PD0 = 00  PENIRQ enable        */

/*
 * SPIMDATA used values.
 */
/*
 * Ask for X conversion. Disable PENIRQ.
 */
#define SPIMDATA_ASKX   (ADS7843_START_BIT   | \
                         ADS7843_A2          | \
			 ADS7843_A1        *0| \
			 ADS7843_A0          | \
                         ADS7843_MODE      *0| \
                         ADS7843_SER_DFR   *0| \
                         ADS7843_PD1         | \
                         ADS7843_PD0            )
/*
 * Ask for Y conversion. Disable PENIRQ.
 */
#define SPIMDATA_ASKY   (ADS7843_START_BIT   | \
                         ADS7843_A2        *0| \
 			 ADS7843_A1        *0| \
	 	 	 ADS7843_A0          | \
                         ADS7843_MODE      *0| \
                         ADS7843_SER_DFR   *0| \
                         ADS7843_PD1         | \
                         ADS7843_PD0            )
/*
 * Enable PENIRQ.
 */
#define SPIMDATA_NOP    (ADS7843_START_BIT   | \
                         ADS7843_A2        *0| \
 			 ADS7843_A1        *0| \
	 	 	 ADS7843_A0        *0| \
                         ADS7843_MODE      *0| \
                         ADS7843_SER_DFR   *0| \
                         ADS7843_PD1       *0| \
                         ADS7843_PD0       *0   )
/*
 * Generate clock to fall pull BUSY signal.
 * No start bit to avoid generating a BUSY at end of the transfert.
 */
#define SPIMDATA_NULL    0

/*
 * Useful masks.
 */
#if defined (CONFIG_UCDIMM)
#define PEN_MASK	PD_IRQ6  /* pen irq signal from the Burr-Brown is */
#define PEN_MASK_2	PD_IRQ1  /* connected to 2 pins of the DragonBall */
                             /* (bit 2 port F and bit 4 port D)       */
//#define BUSY_MASK	PF_A22
//#define CS_MASK		PF_CSA1
#define BUSY_MASK   PB_TIN_TOUT /* use PB6 as the BUSY signal channel */
#define CS_MASK     PG_EMUIRQ    /* use PG2 as the CS signal channel.added bu duwei 03/21/2003 */
//#define CS_MASK     PF_CLKO    /* use PF2 as the CS signal channel.added by liusen 07/08/2004 */
//#define CS_MASK     PG_EMUCS     /*use PG4 as the CS signal channel.added bu duwei 03/21/2003 */
#define PESEL_MASK	0x07
#define CONV_MASK	0x0FFF   /* 12 bit conversion */

#define PEN_IRQ_NUM	IRQ6_IRQ_NUM
/*
#define CS_DATA		PFDATA
#define CS_PUEN		PFPUEN
#define CS_DIR		PFDIR
#define CS_SEL		PFSEL
*/
//changed by duwei 03/21/2003
#define CS_DATA		PGDATA
#define CS_PUEN		PGPUEN
#define CS_DIR		PGDIR
#define CS_SEL		PGSEL

//changed by liusen 07/09/2004
//#define CS_DATA		PFDATA
//#define CS_PUEN		PFPUEN
//#define CS_DIR		PFDIR
//#define CS_SEL		PFSEL

#define PENIRQ_DATA 	PDDATA
#define PENIRQ_PUEN	PDPUEN
#define PENIRQ_DIR	PDDIR
#define PENIRQ_SEL	PDSEL
#define ICR_PENPOL	ICR_POL6
#define IMR_MPEN	IMR_MIRQ6

#else
#error "unexpected"
#define USE_PENIRQ_PULUP
#define PEN_MASK	PF_IRQ5  /* pen irq signal from the Burr-Brown is */
#define PEN_MASK_2	PD_IRQ1  /* connected to 2 pins of the DragonBall */
                             /* (bit 2 port F and bit 4 port D)       */
#define BUSY_MASK	PF_A22
#define CS_MASK		PB_CSD0_CAS0
#define PESEL_MASK	0x07
#define CONV_MASK	0x0FFF   /* 12 bit conversion */

#define PEN_IRQ_NUM	IRQ5_IRQ_NUM

/* chip select register offset */
#define CS_DATA		PBDATA
#define CS_PUEN		PBPUEN
#define CS_DIR		PBDIR
#define CS_SEL		PBSEL

/* pen irq register offsets and data */
#define PENIRQ_DATA	PFDATA
#define PENIRQ_PUEN	PFPUEN
#define PENIRQ_DIR	PFDIR
#define PENIRQ_SEL	PFSEL
#define ICR_PENPOL	ICR_POL5
#define IMR_MPEN	IMR_MIRQ5
#endif


/*
 * Touch screen driver states.
 */
#define TS_DRV_ERROR       -1
#define TS_DRV_IDLE         0
#define TS_DRV_WAIT         1
#define TS_DRV_ASKX         2
#define TS_DRV_ASKY         3
#define TS_DRV_READX        4
#define TS_DRV_READY        5

/*
 * Conversion status.
 */
#define CONV_ERROR      -1   /* error during conversion flow        */    
#define CONV_END         0   /* conversion ended (= pen is up)      */
#define CONV_LOOP        1   /* conversion continue (= pen is down) */

/*----------------------------------------------------------------------------*/
/* macros --------------------------------------------------------------------*/

#define TICKS(nbms)        ((HZ*(nbms))/1000)

/*----------------------------------------------------------------------------*/

/*
 * Look in the PF register if it is on interrupt state.
 */
#ifdef CONFIG_XCOPILOT_BUGS
# define IS_PEN_DOWN    ((IPR&IPR_PEN)!=0)
#else
# define IS_PEN_DOWN	((PENIRQ_DATA & PEN_MASK)==ST_PEN_DOWN)
#endif

/*
 * State of the BUSY signal of the SPIM.
 */
//#define IS_BUSY_ENDED   ((PFDATA & BUSY_MASK)==0)
//#define IS_BUSY_ENDED   ((PGDATA & BUSY_MASK)==0)  //changed by duwei 03/21/2003
#define IS_BUSY_ENDED   ((PBDATA & BUSY_MASK)==0)  //changed by duwei 07/2/2003