| /* |
| * au1000_ts.c -- Touch screen driver for the Alchemy Au1000's |
| * SSI Port 0 talking to the ADS7846 touch screen |
| * controller. |
| * |
| * Copyright 2001 MontaVista Software Inc. |
| * Author: MontaVista Software, Inc. |
| * stevel@mvista.com or source@mvista.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. |
| * |
| * Notes: |
| * |
| * Revision history |
| * 06.27.2001 Initial version |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/version.h> |
| |
| #include <linux/init.h> |
| #include <linux/fs.h> |
| #include <linux/delay.h> |
| #include <linux/poll.h> |
| #include <linux/string.h> |
| #include <linux/ioport.h> /* request_region */ |
| #include <linux/interrupt.h> /* mark_bh */ |
| #include <asm/uaccess.h> /* get_user,copy_to_user */ |
| #include <asm/io.h> |
| #include <asm/au1000.h> |
| |
| #define TS_NAME "au1000-ts" |
| #define TS_MAJOR 11 |
| |
| #define PFX TS_NAME |
| #define AU1000_TS_DEBUG 1 |
| |
| #ifdef AU1000_TS_DEBUG |
| #define dbg(format, arg...) printk(KERN_DEBUG PFX ": " format "\n" , ## arg) |
| #else |
| #define dbg(format, arg...) do {} while (0) |
| #endif |
| #define err(format, arg...) printk(KERN_ERR PFX ": " format "\n" , ## arg) |
| #define info(format, arg...) printk(KERN_INFO PFX ": " format "\n" , ## arg) |
| #define warn(format, arg...) printk(KERN_WARNING PFX ": " format "\n" , ## arg) |
| |
| |
| // SSI Status register bit defines |
| #define SSISTAT_BF (1<<4) |
| #define SSISTAT_OF (1<<3) |
| #define SSISTAT_UF (1<<2) |
| #define SSISTAT_DONE (1<<1) |
| #define SSISTAT_BUSY (1<<0) |
| |
| // SSI Interrupt Pending and Enable register bit defines |
| #define SSIINT_OI (1<<3) |
| #define SSIINT_UI (1<<2) |
| #define SSIINT_DI (1<<1) |
| |
| // SSI Address/Data register bit defines |
| #define SSIADAT_D (1<<24) |
| #define SSIADAT_ADDR_BIT 16 |
| #define SSIADAT_ADDR_MASK (0xff<<SSIADAT_ADDR_BIT) |
| #define SSIADAT_DATA_BIT 0 |
| #define SSIADAT_DATA_MASK (0xfff<<SSIADAT_DATA_BIT) |
| |
| // SSI Enable register bit defines |
| #define SSIEN_CD (1<<1) |
| #define SSIEN_E (1<<0) |
| |
| // SSI Config register bit defines |
| #define SSICFG_AO (1<<24) |
| #define SSICFG_DO (1<<23) |
| #define SSICFG_ALEN_BIT 20 |
| #define SSICFG_ALEN_MASK (0x7<<SSICFG_ALEN_BIT) |
| #define SSICFG_DLEN_BIT 16 |
| #define SSICFG_DLEN_MASK (0xf<<SSICFG_DLEN_BIT) |
| #define SSICFG_DD (1<<11) |
| #define SSICFG_AD (1<<10) |
| #define SSICFG_BM_BIT 8 |
| #define SSICFG_BM_MASK (0x3<<SSICFG_BM_BIT) |
| #define SSICFG_CE (1<<7) |
| #define SSICFG_DP (1<<6) |
| #define SSICFG_DL (1<<5) |
| #define SSICFG_EP (1<<4) |
| |
| // Bus Turnaround Selection |
| #define SCLK_HOLD_HIGH 0 |
| #define SCLK_HOLD_LOW 1 |
| #define SCLK_CYCLE 2 |
| |
| /* |
| * Default config for SSI0: |
| * |
| * - transmit MSBit first |
| * - expect MSBit first on data receive |
| * - address length 7 bits |
| * - expect data length 12 bits |
| * - do not disable Direction bit |
| * - do not disable Address bits |
| * - SCLK held low during bus turnaround |
| * - Address and Data bits clocked out on falling edge of SCLK |
| * - Direction bit high is a read, low is a write |
| * - Direction bit precedes Address bits |
| * - Active low enable signal |
| */ |
| |
| #define DEFAULT_SSI_CONFIG \ |
| (SSICFG_AO | SSICFG_DO | (6<<SSICFG_ALEN_BIT) | (11<<SSICFG_DLEN_BIT) |\ |
| (SCLK_HOLD_LOW<<SSICFG_BM_BIT) | SSICFG_DP | SSICFG_EP) |
| |
| |
| // ADS7846 Control Byte bit defines |
| #define ADS7846_ADDR_BIT 4 |
| #define ADS7846_ADDR_MASK (0x7<<ADS7846_ADDR_BIT) |
| #define ADS7846_MEASURE_X (0x5<<ADS7846_ADDR_BIT) |
| #define ADS7846_MEASURE_Y (0x1<<ADS7846_ADDR_BIT) |
| #define ADS7846_MEASURE_Z1 (0x3<<ADS7846_ADDR_BIT) |
| #define ADS7846_MEASURE_Z2 (0x4<<ADS7846_ADDR_BIT) |
| #define ADS7846_8BITS (1<<3) |
| #define ADS7846_12BITS 0 |
| #define ADS7846_SER (1<<2) |
| #define ADS7846_DFR 0 |
| #define ADS7846_PWR_BIT 0 |
| #define ADS7846_PD 0 |
| #define ADS7846_ADC_ON (0x1<<ADS7846_PWR_BIT) |
| #define ADS7846_REF_ON (0x2<<ADS7846_PWR_BIT) |
| #define ADS7846_REF_ADC_ON (0x3<<ADS7846_PWR_BIT) |
| |
| #define MEASURE_12BIT_X \ |
| (ADS7846_MEASURE_X | ADS7846_12BITS | ADS7846_DFR | ADS7846_PD) |
| #define MEASURE_12BIT_Y \ |
| (ADS7846_MEASURE_Y | ADS7846_12BITS | ADS7846_DFR | ADS7846_PD) |
| #define MEASURE_12BIT_Z1 \ |
| (ADS7846_MEASURE_Z1 | ADS7846_12BITS | ADS7846_DFR | ADS7846_PD) |
| #define MEASURE_12BIT_Z2 \ |
| (ADS7846_MEASURE_Z2 | ADS7846_12BITS | ADS7846_DFR | ADS7846_PD) |
| |
| typedef enum { |
| IDLE = 0, |
| ACQ_X, |
| ACQ_Y, |
| ACQ_Z1, |
| ACQ_Z2 |
| } acq_state_t; |
| |
| /* +++++++++++++ Lifted from include/linux/h3600_ts.h ++++++++++++++*/ |
| typedef struct { |
| unsigned short pressure; // touch pressure |
| unsigned short x; // calibrated X |
| unsigned short y; // calibrated Y |
| unsigned short millisecs; // timestamp of this event |
| } TS_EVENT; |
| |
| typedef struct { |
| int xscale; |
| int xtrans; |
| int yscale; |
| int ytrans; |
| int xyswap; |
| } TS_CAL; |
| |
| /* Use 'f' as magic number */ |
| #define IOC_MAGIC 'f' |
| |
| #define TS_GET_RATE _IO(IOC_MAGIC, 8) |
| #define TS_SET_RATE _IO(IOC_MAGIC, 9) |
| #define TS_GET_CAL _IOR(IOC_MAGIC, 10, TS_CAL) |
| #define TS_SET_CAL _IOW(IOC_MAGIC, 11, TS_CAL) |
| |
| /* +++++++++++++ Done lifted from include/linux/h3600_ts.h +++++++++*/ |
| |
| |
| #define EVENT_BUFSIZE 128 |
| |
| /* |
| * Which pressure equation to use from ADS7846 datasheet. |
| * The first equation requires knowing only the X plate |
| * resistance, but needs 4 measurements (X, Y, Z1, Z2). |
| * The second equation requires knowing both X and Y plate |
| * resistance, but only needs 3 measurements (X, Y, Z1). |
| * The second equation is preferred because of the shorter |
| * acquisition time required. |
| */ |
| enum { |
| PRESSURE_EQN_1 = 0, |
| PRESSURE_EQN_2 |
| }; |
| |
| |
| /* |
| * The touch screen's X and Y plate resistances, used by |
| * pressure equations. |
| */ |
| #define DEFAULT_X_PLATE_OHMS 580 |
| #define DEFAULT_Y_PLATE_OHMS 580 |
| |
| /* |
| * Pen up/down pressure resistance thresholds. |
| * |
| * FIXME: these are bogus and will have to be found empirically. |
| * |
| * These are hysteresis points. If pen state is up and pressure |
| * is greater than pen-down threshold, pen transitions to down. |
| * If pen state is down and pressure is less than pen-up threshold, |
| * pen transitions to up. If pressure is in-between, pen status |
| * doesn't change. |
| * |
| * This wouldn't be needed if PENIRQ* from the ADS7846 were |
| * routed to an interrupt line on the Au1000. This would issue |
| * an interrupt when the panel is touched. |
| */ |
| #define DEFAULT_PENDOWN_THRESH_OHMS 100 |
| #define DEFAULT_PENUP_THRESH_OHMS 80 |
| |
| typedef struct { |
| int baudrate; |
| u32 clkdiv; |
| acq_state_t acq_state; // State of acquisition state machine |
| int x_raw, y_raw, z1_raw, z2_raw; // The current raw acquisition values |
| TS_CAL cal; // Calibration values |
| // The X and Y plate resistance, needed to calculate pressure |
| int x_plate_ohms, y_plate_ohms; |
| // pressure resistance at which pen is considered down/up |
| int pendown_thresh_ohms; |
| int penup_thresh_ohms; |
| int pressure_eqn; // eqn to use for pressure calc |
| int pendown; // 1 = pen is down, 0 = pen is up |
| TS_EVENT event_buf[EVENT_BUFSIZE];// The event queue |
| int nextIn, nextOut; |
| int event_count; |
| struct fasync_struct *fasync; // asynch notification |
| struct timer_list acq_timer; // Timer for triggering acquisitions |
| wait_queue_head_t wait; // read wait queue |
| spinlock_t lock; |
| struct tq_struct chug_tq; |
| } au1000_ts_t; |
| |
| static au1000_ts_t au1000_ts; |
| |
| |
| static inline u32 |
| calc_clkdiv(int baud) |
| { |
| u32 sys_busclk = |
| (get_au1x00_speed() / (int)(inl(SYS_POWERCTRL)&0x03) + 2); |
| return (sys_busclk / (2 * baud)) - 1; |
| } |
| |
| static inline int |
| calc_baudrate(u32 clkdiv) |
| { |
| u32 sys_busclk = |
| (get_au1x00_speed() / (int)(inl(SYS_POWERCTRL)&0x03) + 2); |
| return sys_busclk / (2 * (clkdiv + 1)); |
| } |
| |
| |
| /* |
| * This is a bottom-half handler that is scheduled after |
| * raw X,Y,Z1,Z2 coordinates have been acquired, and does |
| * the following: |
| * |
| * - computes touch screen pressure resistance |
| * - if pressure is above a threshold considered to be pen-down: |
| * - compute calibrated X and Y coordinates |
| * - queue a new TS_EVENT |
| * - signal asynchronously and wake up any read |
| */ |
| static void |
| chug_raw_data(void* private) |
| { |
| au1000_ts_t* ts = (au1000_ts_t*)private; |
| TS_EVENT event; |
| int Rt, Xcal, Ycal; |
| unsigned long flags; |
| |
| // timestamp this new event. |
| event.millisecs = jiffies; |
| |
| // Calculate touch pressure resistance |
| if (ts->pressure_eqn == PRESSURE_EQN_2) { |
| Rt = (ts->x_plate_ohms * ts->x_raw * |
| (4096 - ts->z1_raw)) / ts->z1_raw; |
| Rt -= (ts->y_plate_ohms * ts->y_raw); |
| Rt = (Rt + 2048) >> 12; // round up to nearest ohm |
| } else { |
| Rt = (ts->x_plate_ohms * ts->x_raw * |
| (ts->z2_raw - ts->z1_raw)) / ts->z1_raw; |
| Rt = (Rt + 2048) >> 12; // round up to nearest ohm |
| } |
| |
| // hysteresis |
| if (!ts->pendown && Rt > ts->pendown_thresh_ohms) |
| ts->pendown = 1; |
| else if (ts->pendown && Rt < ts->penup_thresh_ohms) |
| ts->pendown = 0; |
| |
| if (ts->pendown) { |
| // Pen is down |
| // Calculate calibrated X,Y |
| Xcal = ((ts->cal.xscale * ts->x_raw) >> 8) + ts->cal.xtrans; |
| Ycal = ((ts->cal.yscale * ts->y_raw) >> 8) + ts->cal.ytrans; |
| |
| event.x = (unsigned short)Xcal; |
| event.y = (unsigned short)Ycal; |
| event.pressure = (unsigned short)Rt; |
| |
| // add this event to the event queue |
| spin_lock_irqsave(&ts->lock, flags); |
| ts->event_buf[ts->nextIn++] = event; |
| if (ts->nextIn == EVENT_BUFSIZE) |
| ts->nextIn = 0; |
| if (ts->event_count < EVENT_BUFSIZE) { |
| ts->event_count++; |
| } else { |
| // throw out the oldest event |
| if (++ts->nextOut == EVENT_BUFSIZE) |
| ts->nextOut = 0; |
| } |
| spin_unlock_irqrestore(&ts->lock, flags); |
| |
| // async notify |
| if (ts->fasync) |
| kill_fasync(&ts->fasync, SIGIO, POLL_IN); |
| // wake up any read call |
| if (waitqueue_active(&ts->wait)) |
| wake_up_interruptible(&ts->wait); |
| } |
| } |
| |
| |
| /* |
| * Raw X,Y,pressure acquisition timer function. This triggers |
| * the start of a new acquisition. Its duration between calls |
| * is the touch screen polling rate. |
| */ |
| static void |
| au1000_acq_timer(unsigned long data) |
| { |
| au1000_ts_t* ts = (au1000_ts_t*)data; |
| unsigned long flags; |
| |
| spin_lock_irqsave(&ts->lock, flags); |
| |
| // start acquisition with X coordinate |
| ts->acq_state = ACQ_X; |
| // start me up |
| outl(SSIADAT_D | (MEASURE_12BIT_X << SSIADAT_ADDR_BIT), SSI0_ADATA); |
| |
| // schedule next acquire |
| ts->acq_timer.expires = jiffies + HZ / 100; |
| add_timer(&ts->acq_timer); |
| |
| spin_unlock_irqrestore(&ts->lock, flags); |
| } |
| |
| static void |
| ssi0_interrupt(int irq, void *dev_id, struct pt_regs *regs) |
| { |
| au1000_ts_t *ts = (au1000_ts_t*)dev_id; |
| u32 stat, int_stat, data; |
| |
| spin_lock(&ts->lock); |
| |
| stat = inl(SSI0_STATUS); |
| // clear sticky status bits |
| outl(stat & (SSISTAT_OF|SSISTAT_UF|SSISTAT_DONE), SSI0_STATUS); |
| |
| int_stat = inl(SSI0_INT); |
| // clear sticky intr status bits |
| outl(int_stat & (SSIINT_OI|SSIINT_UI|SSIINT_DI), SSI0_INT); |
| |
| if ((int_stat & (SSIINT_OI|SSIINT_UI|SSIINT_DI)) != SSIINT_DI) { |
| if (int_stat & SSIINT_OI) |
| err("overflow"); |
| if (int_stat & SSIINT_UI) |
| err("underflow"); |
| spin_unlock(&ts->lock); |
| return; |
| } |
| |
| data = inl(SSI0_ADATA) & SSIADAT_DATA_MASK; |
| |
| switch (ts->acq_state) { |
| case IDLE: |
| break; |
| case ACQ_X: |
| ts->x_raw = data; |
| ts->acq_state = ACQ_Y; |
| // trigger Y acq |
| outl(SSIADAT_D | (MEASURE_12BIT_Y << SSIADAT_ADDR_BIT), |
| SSI0_ADATA); |
| break; |
| case ACQ_Y: |
| ts->y_raw = data; |
| ts->acq_state = ACQ_Z1; |
| // trigger Z1 acq |
| outl(SSIADAT_D | (MEASURE_12BIT_Z1 << SSIADAT_ADDR_BIT), |
| SSI0_ADATA); |
| break; |
| case ACQ_Z1: |
| ts->z1_raw = data; |
| if (ts->pressure_eqn == PRESSURE_EQN_2) { |
| // don't acq Z2, using 2nd eqn for touch pressure |
| ts->acq_state = IDLE; |
| // got the raw stuff, now mark BH |
| queue_task(&ts->chug_tq, &tq_immediate); |
| mark_bh(IMMEDIATE_BH); |
| } else { |
| ts->acq_state = ACQ_Z2; |
| // trigger Z2 acq |
| outl(SSIADAT_D | (MEASURE_12BIT_Z2<<SSIADAT_ADDR_BIT), |
| SSI0_ADATA); |
| } |
| break; |
| case ACQ_Z2: |
| ts->z2_raw = data; |
| ts->acq_state = IDLE; |
| // got the raw stuff, now mark BH |
| queue_task(&ts->chug_tq, &tq_immediate); |
| mark_bh(IMMEDIATE_BH); |
| break; |
| } |
| |
| spin_unlock(&ts->lock); |
| } |
| |
| |
| /* +++++++++++++ File operations ++++++++++++++*/ |
| |
| static int |
| au1000_fasync(int fd, struct file *filp, int mode) |
| { |
| au1000_ts_t* ts = (au1000_ts_t*)filp->private_data; |
| return fasync_helper(fd, filp, mode, &ts->fasync); |
| } |
| |
| static int |
| au1000_ioctl(struct inode * inode, struct file *filp, |
| unsigned int cmd, unsigned long arg) |
| { |
| au1000_ts_t* ts = (au1000_ts_t*)filp->private_data; |
| |
| switch(cmd) { |
| case TS_GET_RATE: /* TODO: what is this? */ |
| break; |
| case TS_SET_RATE: /* TODO: what is this? */ |
| break; |
| case TS_GET_CAL: |
| copy_to_user((char *)arg, (char *)&ts->cal, sizeof(TS_CAL)); |
| break; |
| case TS_SET_CAL: |
| copy_from_user((char *)&ts->cal, (char *)arg, sizeof(TS_CAL)); |
| break; |
| default: |
| err("unknown cmd %04x", cmd); |
| return -EINVAL; |
| } |
| |
| return 0; |
| } |
| |
| static unsigned int |
| au1000_poll(struct file * filp, poll_table * wait) |
| { |
| au1000_ts_t* ts = (au1000_ts_t*)filp->private_data; |
| poll_wait(filp, &ts->wait, wait); |
| if (ts->event_count) |
| return POLLIN | POLLRDNORM; |
| return 0; |
| } |
| |
| static ssize_t |
| au1000_read(struct file * filp, char * buf, size_t count, loff_t * l) |
| { |
| au1000_ts_t* ts = (au1000_ts_t*)filp->private_data; |
| unsigned long flags; |
| TS_EVENT event; |
| int i; |
| |
| if (ts->event_count == 0) { |
| if (filp->f_flags & O_NONBLOCK) |
| return -EAGAIN; |
| interruptible_sleep_on(&ts->wait); |
| if (signal_pending(current)) |
| return -ERESTARTSYS; |
| } |
| |
| for (i = count; |
| i >= sizeof(TS_EVENT); |
| i -= sizeof(TS_EVENT), buf += sizeof(TS_EVENT)) { |
| if (ts->event_count == 0) |
| break; |
| spin_lock_irqsave(&ts->lock, flags); |
| event = ts->event_buf[ts->nextOut++]; |
| if (ts->nextOut == EVENT_BUFSIZE) |
| ts->nextOut = 0; |
| if (ts->event_count) |
| ts->event_count--; |
| spin_unlock_irqrestore(&ts->lock, flags); |
| copy_to_user(buf, &event, sizeof(TS_EVENT)); |
| } |
| |
| return count - i; |
| } |
| |
| |
| static int |
| au1000_open(struct inode * inode, struct file * filp) |
| { |
| au1000_ts_t* ts; |
| unsigned long flags; |
| |
| filp->private_data = ts = &au1000_ts; |
| |
| spin_lock_irqsave(&ts->lock, flags); |
| |
| // setup SSI0 config |
| outl(DEFAULT_SSI_CONFIG, SSI0_CONFIG); |
| |
| // clear out SSI0 status bits |
| outl(SSISTAT_OF|SSISTAT_UF|SSISTAT_DONE, SSI0_STATUS); |
| // clear out SSI0 interrupt pending bits |
| outl(SSIINT_OI|SSIINT_UI|SSIINT_DI, SSI0_INT); |
| |
| // enable SSI0 interrupts |
| outl(SSIINT_OI|SSIINT_UI|SSIINT_DI, SSI0_INT_ENABLE); |
| |
| /* |
| * init bh handler that chugs the raw data (calibrates and |
| * calculates touch pressure). |
| */ |
| ts->chug_tq.routine = chug_raw_data; |
| ts->chug_tq.data = ts; |
| ts->pendown = 0; // pen up |
| |
| // flush event queue |
| ts->nextIn = ts->nextOut = ts->event_count = 0; |
| |
| // Start acquisition timer function |
| init_timer(&ts->acq_timer); |
| ts->acq_timer.function = au1000_acq_timer; |
| ts->acq_timer.data = (unsigned long)ts; |
| ts->acq_timer.expires = jiffies + HZ / 100; |
| add_timer(&ts->acq_timer); |
| |
| spin_unlock_irqrestore(&ts->lock, flags); |
| MOD_INC_USE_COUNT; |
| return 0; |
| } |
| |
| static int |
| au1000_release(struct inode * inode, struct file * filp) |
| { |
| au1000_ts_t* ts = (au1000_ts_t*)filp->private_data; |
| unsigned long flags; |
| |
| au1000_fasync(-1, filp, 0); |
| del_timer_sync(&ts->acq_timer); |
| |
| spin_lock_irqsave(&ts->lock, flags); |
| // disable SSI0 interrupts |
| outl(0, SSI0_INT_ENABLE); |
| spin_unlock_irqrestore(&ts->lock, flags); |
| |
| MOD_DEC_USE_COUNT; |
| return 0; |
| } |
| |
| |
| static struct file_operations ts_fops = { |
| read: au1000_read, |
| poll: au1000_poll, |
| ioctl: au1000_ioctl, |
| fasync: au1000_fasync, |
| open: au1000_open, |
| release: au1000_release, |
| }; |
| |
| /* +++++++++++++ End File operations ++++++++++++++*/ |
| |
| |
| int __init |
| au1000ts_init_module(void) |
| { |
| au1000_ts_t* ts = &au1000_ts; |
| int ret; |
| |
| /* register our character device */ |
| if ((ret = register_chrdev(TS_MAJOR, TS_NAME, &ts_fops)) < 0) { |
| err("can't get major number"); |
| return ret; |
| } |
| info("registered"); |
| |
| memset(ts, 0, sizeof(au1000_ts_t)); |
| init_waitqueue_head(&ts->wait); |
| spin_lock_init(&ts->lock); |
| |
| if (!request_region(virt_to_phys((void*)SSI0_STATUS), 0x100, TS_NAME)) { |
| err("SSI0 ports in use"); |
| return -ENXIO; |
| } |
| |
| if ((ret = request_irq(AU1000_SSI0_INT, ssi0_interrupt, |
| SA_SHIRQ | SA_INTERRUPT, TS_NAME, ts))) { |
| err("could not get IRQ"); |
| return ret; |
| } |
| |
| // initial calibration values |
| ts->cal.xscale = -93; |
| ts->cal.xtrans = 346; |
| ts->cal.yscale = -64; |
| ts->cal.ytrans = 251; |
| |
| // init pen up/down hysteresis points |
| ts->pendown_thresh_ohms = DEFAULT_PENDOWN_THRESH_OHMS; |
| ts->penup_thresh_ohms = DEFAULT_PENUP_THRESH_OHMS; |
| ts->pressure_eqn = PRESSURE_EQN_2; |
| // init X and Y plate resistances |
| ts->x_plate_ohms = DEFAULT_X_PLATE_OHMS; |
| ts->y_plate_ohms = DEFAULT_Y_PLATE_OHMS; |
| |
| // set GPIO to SSI0 function |
| outl(inl(SYS_PINFUNC) & ~1, SYS_PINFUNC); |
| |
| // enable SSI0 clock and bring SSI0 out of reset |
| outl(0, SSI0_CONTROL); |
| udelay(1000); |
| outl(SSIEN_E, SSI0_CONTROL); |
| udelay(100); |
| |
| // FIXME: is this a working baudrate? |
| ts->clkdiv = 0; |
| ts->baudrate = calc_baudrate(ts->clkdiv); |
| outl(ts->clkdiv, SSI0_CLKDIV); |
| |
| info("baudrate = %d Hz", ts->baudrate); |
| |
| return 0; |
| } |
| |
| void |
| au1000ts_cleanup_module(void) |
| { |
| // disable clocks and hold in reset |
| outl(SSIEN_CD, SSI0_CONTROL); |
| free_irq(AU1000_SSI0_INT, &au1000_ts); |
| release_region(virt_to_phys((void*)SSI0_STATUS), 0x100); |
| unregister_chrdev(TS_MAJOR, TS_NAME); |
| } |
| |
| /* Module information */ |
| MODULE_AUTHOR("Steve Longerbeam, stevel@mvista.com, www.mvista.com"); |
| MODULE_DESCRIPTION("Au1000/ADS7846 Touch Screen Driver"); |
| |
| module_init(au1000ts_init_module); |
| module_exit(au1000ts_cleanup_module); |