2 * drivers/input/touchscreen/xpt2046_ts.c - driver for rk29 spi xpt2046 device and console
4 * Copyright (C) 2011 ROCKCHIP, Inc.
6 * This software is licensed under the terms of the GNU General Public
7 * License version 2, as published by the Free Software Foundation, and
8 * may be copied, distributed, and modified under those terms.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
16 #include <linux/hwmon.h>
17 #include <linux/init.h>
18 #include <linux/err.h>
19 #include <linux/delay.h>
20 #include <linux/input.h>
21 #include <linux/interrupt.h>
22 #include <linux/slab.h>
23 #include <linux/gpio.h>
24 #include <linux/spi/spi.h>
27 #include "xpt2046_ts.h"
30 * This code has been heavily tested on a Nokia 770, and lightly
31 * tested on other xpt2046 devices (OSK/Mistral, Lubbock).
32 * TSC2046 is just newer xpt2046 silicon.
33 * Support for ads7843 tested on Atmel at91sam926x-EK.
34 * Support for ads7845 has only been stubbed in.
36 * IRQ handling needs a workaround because of a shortcoming in handling
37 * edge triggered IRQs on some platforms like the OMAP1/2. These
38 * platforms don't handle the ARM lazy IRQ disabling properly, thus we
39 * have to maintain our own SW IRQ disabled status. This should be
40 * removed as soon as the affected platform's IRQ handling is fixed.
42 * app note sbaa036 talks in more detail about accurate sampling...
43 * that ought to help in situations like LCDs inducing noise (which
44 * can also be helped by using synch signals) and more generally.
45 * This driver tries to utilize the measures described in the app
46 * note. The strength of filtering can be set in the board-* specific
49 #define XPT2046_DEBUG 0
51 #define xpt2046printk(msg...) printk(msg);
53 #define xpt2046printk(msg...)
55 #define LCD_MAX_LENGTH 596
56 #define LCD_MAX_WIDTH 320
57 #define PT2046_TOUCH_AD_LEFT 256
58 #define PT2046_TOUCH_AD_RIGHT 3870
59 #define PT2046_TOUCH_AD_TOP 380
60 #define PT2046_TOUCH_AD_BOTTOM 3658
61 #define AD_TO_X(adx) (LCD_MAX_WIDTH * ( adx - PT2046_TOUCH_AD_TOP ) / ( PT2046_TOUCH_AD_BOTTOM - PT2046_TOUCH_AD_TOP ))
62 #define AD_TO_Y(ady) (LCD_MAX_LENGTH * ( ady - PT2046_TOUCH_AD_LEFT ) / ( PT2046_TOUCH_AD_RIGHT - PT2046_TOUCH_AD_LEFT ))
64 #define TS_POLL_DELAY (10 * 1000000) /* ns delay before the first sample */
65 #define TS_POLL_PERIOD (20 * 1000000) /* ns delay between samples */
67 #define DEBOUNCE_REPTIME 3
68 /* this driver doesn't aim at the peak continuous sample rate */
69 #define SAMPLE_BITS (8 /*cmd*/ + 16 /*sample*/ + 2 /* before, after */)
72 /* For portability, we can't read 12 bit values using SPI (which
73 * would make the controller deliver them as native byteorder u16
74 * with msbs zeroed). Instead, we read them as two 8-bit values,
75 * *** WHICH NEED BYTESWAPPING *** and range adjustment.
83 * We allocate this separately to avoid cache line sharing issues when
84 * driver is used with DMA-based SPI controllers (like atmel_spi) on
85 * systems where main memory is not DMA-coherent (most non-x86 boards).
87 struct xpt2046_packet {
88 u8 read_x, read_y, pwrdown;
89 u16 dummy; /* for the pwrdown read */
94 struct input_dev *input;
98 struct spi_device *spi;
103 struct xpt2046_packet *packet;
105 struct spi_transfer xfer[18];
106 struct spi_message msg[5];
107 struct spi_message *last_msg;
117 u16 penirq_recheck_delay_usecs;
120 struct hrtimer timer;
121 unsigned pendown:1; /* P: lock */
122 unsigned pending:1; /* P: lock */
123 // FIXME remove "irq_disabled"
124 unsigned irq_disabled:1; /* P: lock */
126 unsigned is_suspended:1;
128 int (*filter)(void *data, int data_idx, int *val);
130 void (*filter_cleanup)(void *data);
131 int (*get_pendown_state)(void);
134 void (*wait_for_sync)(void);
137 /* leave chip selected when we're done, for quicker re-select? */
139 #define CS_CHANGE(xfer) ((xfer).cs_change = 1)
141 #define CS_CHANGE(xfer) ((xfer).cs_change = 0)
144 /*--------------------------------------------------------------------------*/
146 /* The xpt2046 has touchscreen and other sensors.
147 * Earlier xpt2046 chips are somewhat compatible.
149 #define XPT2046_START (1 << 7)
150 #define XPT2046_A2A1A0_d_y (1 << 4) /* differential */
151 #define XPT2046_A2A1A0_d_z1 (3 << 4) /* differential */
152 #define XPT2046_A2A1A0_d_z2 (4 << 4) /* differential */
153 #define XPT2046_A2A1A0_d_x (5 << 4) /* differential */
154 #define XPT2046_A2A1A0_temp0 (0 << 4) /* non-differential */
155 #define XPT2046_A2A1A0_vbatt (2 << 4) /* non-differential */
156 #define XPT2046_A2A1A0_vaux (6 << 4) /* non-differential */
157 #define XPT2046_A2A1A0_temp1 (7 << 4) /* non-differential */
158 #define XPT2046_8_BIT (1 << 3)
159 #define XPT2046_12_BIT (0 << 3)
160 #define XPT2046_SER (1 << 2) /* non-differential */
161 #define XPT2046_DFR (0 << 2) /* differential */
162 #define XPT2046_PD10_PDOWN (0 << 0) /* lowpower mode + penirq */
163 #define XPT2046_PD10_ADC_ON (1 << 0) /* ADC on */
164 #define XPT2046_PD10_REF_ON (2 << 0) /* vREF on + penirq */
165 #define XPT2046_PD10_ALL_ON (3 << 0) /* ADC + vREF on */
167 #define MAX_12BIT ((1<<12)-1)
169 /* leave ADC powered up (disables penirq) between differential samples */
170 #define READ_12BIT_DFR(x, adc, vref) (XPT2046_START | XPT2046_A2A1A0_d_ ## x \
171 | XPT2046_12_BIT | XPT2046_DFR | \
172 (adc ? XPT2046_PD10_ADC_ON : 0) | (vref ? XPT2046_PD10_REF_ON : 0))
174 #define READ_Y(vref) (READ_12BIT_DFR(y, 1, vref))
175 #define READ_Z1(vref) (READ_12BIT_DFR(z1, 1, vref))
176 #define READ_Z2(vref) (READ_12BIT_DFR(z2, 1, vref))
178 #define READ_X(vref) (READ_12BIT_DFR(x, 1, vref))
179 #define PWRDOWN (READ_12BIT_DFR(y, 0, 0)) /* LAST */
181 /* single-ended samples need to first power up reference voltage;
182 * we leave both ADC and VREF powered
184 #define READ_12BIT_SER(x) (XPT2046_START | XPT2046_A2A1A0_ ## x \
185 | XPT2046_12_BIT | XPT2046_SER)
187 #define REF_ON (READ_12BIT_DFR(x, 1, 1))
188 #define REF_OFF (READ_12BIT_DFR(y, 0, 0))
190 /*--------------------------------------------------------------------------*/
192 * touchscreen sensors use differential conversions.
198 u16 dummy; /* for the pwrdown read */
200 struct spi_message msg;
201 struct spi_transfer xfer[4];
205 #define LEN_TO_PIX(x) (unsigned int)( 320 * (x) / 47 )
213 #define KEY_BOTTOM 567
215 #define KEY1_LEFT LEN_TO_PIX(KEY1_X - KEY_RADIUS)
216 #define KEY1_RIGHT LEN_TO_PIX(KEY1_X + KEY_RADIUS)
217 #define KEY2_LEFT LEN_TO_PIX(KEY2_X - KEY_RADIUS)
218 #define KEY2_RIGHT LEN_TO_PIX(KEY2_X + KEY_RADIUS)
219 #define KEY3_LEFT LEN_TO_PIX(KEY3_X - KEY_RADIUS)
220 #define KEY3_RIGHT LEN_TO_PIX(KEY3_X + KEY_RADIUS)
221 #define KEY4_LEFT LEN_TO_PIX(KEY4_X - KEY_RADIUS)
222 #define KEY4_RIGHT LEN_TO_PIX(KEY4_X + KEY_RADIUS)
233 static struct KeyInfo panel_key_info[]={
234 {KEY1_LEFT, KEY1_RIGHT, KEY_HOME, 0},
235 {KEY2_LEFT, KEY2_RIGHT, KEY_MENU, 0},
236 {KEY3_LEFT, KEY3_RIGHT, KEY_BACK, 0},
237 {KEY4_LEFT, KEY4_RIGHT, KEY_SEARCH, 0},
241 static void xpt2046_enable(struct xpt2046 *ts);
242 static void xpt2046_disable(struct xpt2046 *ts);
244 static int device_suspended(struct device *dev)
246 struct xpt2046 *ts = dev_get_drvdata(dev);
247 return ts->is_suspended || ts->disabled;
250 static int xpt2046_read12_dfr(struct device *dev, unsigned command)
252 struct spi_device *spi = to_spi_device(dev);
253 struct xpt2046 *ts = dev_get_drvdata(dev);
254 struct dfr_req *req = kzalloc(sizeof *req, GFP_KERNEL);
260 spi_message_init(&req->msg);
263 req->command = (u8) command;
264 req->xfer[0].tx_buf = &req->command;
265 req->xfer[0].len = 1;
266 spi_message_add_tail(&req->xfer[0], &req->msg);
268 req->xfer[1].rx_buf = &req->sample;
269 req->xfer[1].len = 2;
270 //xpt2046printk("-------------1 sample 0x%x,command=%x--------------------\n",req->sample,(u8)command); //add by zhao
271 spi_message_add_tail(&req->xfer[1], &req->msg);
273 /* converter in low power mode & enable PENIRQ */
274 req->pwrdown= PWRDOWN;
275 req->xfer[2].tx_buf = &req->pwrdown;
276 req->xfer[2].len = 1;
277 spi_message_add_tail(&req->xfer[2], &req->msg);
279 req->xfer[3].rx_buf = &req->dummy;
280 req->xfer[3].len = 2;
281 CS_CHANGE(req->xfer[3]);
282 spi_message_add_tail(&req->xfer[3], &req->msg);
284 ts->irq_disabled = 1;
285 disable_irq(spi->irq);
286 status = spi_sync(spi, &req->msg);
287 ts->irq_disabled = 0;
288 enable_irq(spi->irq);
289 //xpt2046printk("-------------2 sample 0x%x-----------------\n",req->sample); //add by zhao
291 /* on-wire is a must-ignore bit, a BE12 value, then padding */
292 status = be16_to_cpu(req->sample);
293 status = status >> 3;
295 xpt2046printk("***>%s:status=%d\n",__FUNCTION__,status);
304 /*--------------------------------------------------------------------------*/
306 static int get_pendown_state(struct xpt2046 *ts)
308 if (ts->get_pendown_state)
309 return ts->get_pendown_state();
311 return !gpio_get_value(ts->gpio_pendown);
314 static void null_wait_for_sync(void)
320 * PENIRQ only kicks the timer. The timer only reissues the SPI transfer,
321 * to retrieve touchscreen status.
323 * The SPI transfer completion callback does the real work. It reports
324 * touchscreen events and reactivates the timer (or IRQ) as appropriate.
327 static void xpt2046_rx(void *xpt)
329 struct xpt2046 *ts = xpt;
330 struct xpt2046_platform_data *pdata = ts->spi->dev.platform_data;
331 struct xpt2046_packet *packet = ts->packet;
335 /* xpt2046_rx_val() did in-place conversion (including byteswap) from
336 * on-the-wire format as part of debouncing to get stable readings.
341 xpt2046printk("***>%s:x=%d,y=%d\n",__FUNCTION__,x,y);
343 /* range filtering */
347 /* Sample found inconsistent by debouncing or pressure is beyond
348 * the maximum. Don't report it to user space, repeat at least
349 * once more the measurement
351 if (packet->tc.ignore) {
353 xpt2046printk("***>%s:ignored=%d\n",__FUNCTION__,packet->tc.ignore);
355 hrtimer_start(&ts->timer, ktime_set(0, TS_POLL_PERIOD),
360 /* Maybe check the pendown state before reporting. This discards
361 * false readings when the pen is lifted.
363 if (ts->penirq_recheck_delay_usecs) {
364 udelay(ts->penirq_recheck_delay_usecs);
365 if (!get_pendown_state(ts))
367 xpt2046printk("***>%s:get_pendown_state(ts)==0,discard false reading\n",__FUNCTION__);
372 /* NOTE: We can't rely on the pressure to determine the pen down
373 * state, even this controller has a pressure sensor. The pressure
374 * value can fluctuate for quite a while after lifting the pen and
375 * in some cases may not even settle at the expected value.
377 * The only safe way to check for the pen up condition is in the
378 * timer by reading the pen signal state (it's a GPIO _and_ IRQ).
381 struct input_dev *input = ts->input;
382 /* if (!ts->pendown) {
383 input_report_key(input, BTN_TOUCH, 1);
385 xpt2046printk("***>%s:input_report_key(pen down)\n",__FUNCTION__);
395 if ((y > KEY_TOP) && (y < KEY_BOTTOM))
397 for (i = 0; i < ARRAY_SIZE(panel_key_info); i++)
399 if ((x > panel_key_info[i].left) && (x < panel_key_info[i].right))
401 panel_key_info[i].status = 1;
402 input_report_key(input, panel_key_info[i].key,1);
404 xpt2046printk("***>%s:input_report_key(%2d)(%4d , %4d)\n",__FUNCTION__,panel_key_info[i].key, x, y);
409 else if (y <= pdata->y_max)
412 input_report_key(input, BTN_TOUCH, 1);
414 xpt2046printk("***>%s:input_report_key(pen down)\n",__FUNCTION__);
416 input_report_abs(input, ABS_X, x);
417 input_report_abs(input, ABS_Y, y);
419 xpt2046printk("***>%s:input_report_abs(%4d , %4d)\n",__FUNCTION__,x, y);
424 hrtimer_start(&ts->timer, ktime_set(0, TS_POLL_PERIOD),
428 static int xpt2046_debounce(void *xpt, int data_idx, int *val)
430 struct xpt2046 *ts = xpt;
431 static int average_val[2];
434 /* xpt2046printk("***>%s:data_idx=%d,last_read=%d,read_cnt=%d,debounce_max=%d,last_read=%d,debounce_tol=%d,read_rep=%d,debounce_rep=%d\n",__FUNCTION__,
435 data_idx,ts->last_read,
436 ts->read_cnt,ts->debounce_max,
437 abs(ts->last_read - *val),ts->debounce_tol,
438 ts->read_rep,ts->debounce_rep);
440 if(*val == 4095 || *val == 0)
444 memset(average_val,0,sizeof(average_val));
445 xpt2046printk("***>%s:*val == 4095 || *val == 0\n",__FUNCTION__);
446 return XPT2046_FILTER_IGNORE;
448 /* discard the first sample. */
452 return XPT2046_FILTER_REPEAT;
455 if (ts->read_cnt==1 || (abs(ts->last_read - *val) > ts->debounce_tol)) {
456 /* Start over collecting consistent readings. */
458 average_val[data_idx] = *val;
459 /* Repeat it, if this was the first read or the read
460 * wasn't consistent enough. */
461 if (ts->read_cnt < ts->debounce_max) {
462 ts->last_read = *val;
464 return XPT2046_FILTER_REPEAT;
466 /* Maximum number of debouncing reached and still
467 * not enough number of consistent readings. Abort
468 * the whole sample, repeat it in the next sampling
473 memset(average_val,0,sizeof(average_val));
474 xpt2046printk("***>%s:XPT2046_FILTER_IGNORE\n",__FUNCTION__);
475 return XPT2046_FILTER_IGNORE;
479 average_val[data_idx] += *val;
481 if (++ts->read_rep >= ts->debounce_rep) {
482 /* Got a good reading for this coordinate,
483 * go for the next one. */
487 *val = average_val[data_idx]/(ts->debounce_rep);
488 return XPT2046_FILTER_OK;
490 /* Read more values that are consistent. */
493 return XPT2046_FILTER_REPEAT;
498 static int xpt2046_no_filter(void *xpt, int data_idx, int *val)
500 return XPT2046_FILTER_OK;
503 static void xpt2046_rx_val(void *xpt)
505 struct xpt2046 *ts = xpt;
506 struct xpt2046_packet *packet = ts->packet;
507 struct spi_message *m;
508 struct spi_transfer *t;
513 m = &ts->msg[ts->msg_idx];
514 t = list_entry(m->transfers.prev, struct spi_transfer, transfer_list);
516 /* adjust: on-wire is a must-ignore bit, a BE12 value, then padding;
517 * built from two 8 bit values written msb-first.
519 val = (be16_to_cpup((__be16 *)t->rx_buf) >> 3) & 0x0fff;
521 // xpt2046printk("***>%s:value=%d, x=%d, y=%d, rx_buf=%d\n",__FUNCTION__,val,packet->tc.x,packet->tc.y,*(u16 *)t->rx_buf);
523 action = ts->filter(ts->filter_data, ts->msg_idx, &val);
525 case XPT2046_FILTER_REPEAT:
527 case XPT2046_FILTER_IGNORE:
528 packet->tc.ignore = 1;
529 /* Last message will contain xpt2046_rx() as the
530 * completion function.
534 case XPT2046_FILTER_OK:
535 *(u16 *)t->rx_buf = val;
536 packet->tc.ignore = 0;
537 m = &ts->msg[++ts->msg_idx];
543 status = spi_async(ts->spi, m);
545 dev_err(&ts->spi->dev, "spi_async --> %d\n",
549 static enum hrtimer_restart xpt2046_timer(struct hrtimer *handle)
551 struct xpt2046 *ts = container_of(handle, struct xpt2046, timer);
555 spin_lock(&ts->lock);
557 if (unlikely(!get_pendown_state(ts) ||
558 device_suspended(&ts->spi->dev))) {
560 struct input_dev *input = ts->input;
561 for(i = 0; i < ARRAY_SIZE(panel_key_info); i++)
563 if (panel_key_info[i].status)
565 input_report_key(input, panel_key_info[i].key, 0);
566 panel_key_info[i].status = 0;
568 xpt2046printk("***>%s:input_report_key(KEY up)\n",__FUNCTION__);
573 input_report_key(input, BTN_TOUCH, 0);
577 xpt2046printk("***>%s:input_report_key(The touchscreen up)\n",__FUNCTION__);
580 /* measurement cycle ended */
581 if (!device_suspended(&ts->spi->dev)) {
582 xpt2046printk("***>%s:device_suspended==0\n",__FUNCTION__);
583 ts->irq_disabled = 0;
584 enable_irq(ts->spi->irq);
588 /* pen is still down, continue with the measurement */
589 xpt2046printk("***>%s:pen is still down, continue with the measurement\n",__FUNCTION__);
592 status = spi_async(ts->spi, &ts->msg[0]);
594 dev_err(&ts->spi->dev, "spi_async --> %d\n", status);
597 spin_unlock(&ts->lock);
598 return HRTIMER_NORESTART;
601 static irqreturn_t xpt2046_irq(int irq, void *handle)
603 struct xpt2046 *ts = handle;
605 xpt2046printk("\n-----------xpt2046_irq------------------\n");
606 xpt2046printk("***>%s.....%s.....%d\n",__FILE__,__FUNCTION__,__LINE__);
608 spin_lock_irqsave(&ts->lock, flags);
610 if (likely(get_pendown_state(ts))) {
611 if (!ts->irq_disabled) {
612 /* The ARM do_simple_IRQ() dispatcher doesn't act
613 * like the other dispatchers: it will report IRQs
614 * even after they've been disabled. We work around
615 * that here. (The "generic irq" framework may help...)
617 ts->irq_disabled = 1;
618 disable_irq_nosync(ts->spi->irq);
620 hrtimer_start(&ts->timer, ktime_set(0, TS_POLL_DELAY),
624 spin_unlock_irqrestore(&ts->lock, flags);
629 /*--------------------------------------------------------------------------*/
631 /* Must be called with ts->lock held */
632 static void xpt2046_disable(struct xpt2046 *ts)
639 /* are we waiting for IRQ, or polling? */
641 ts->irq_disabled = 1;
642 disable_irq(ts->spi->irq);
644 /* the timer will run at least once more, and
645 * leave everything in a clean state, IRQ disabled
647 while (ts->pending) {
648 spin_unlock_irq(&ts->lock);
650 spin_lock_irq(&ts->lock);
654 /* we know the chip's in lowpower mode since we always
655 * leave it that way after every request
659 /* Must be called with ts->lock held */
660 static void xpt2046_enable(struct xpt2046 *ts)
666 ts->irq_disabled = 0;
667 enable_irq(ts->spi->irq);
670 static int xpt2046_suspend(struct spi_device *spi, pm_message_t message)
672 struct xpt2046 *ts = dev_get_drvdata(&spi->dev);
674 spin_lock_irq(&ts->lock);
676 ts->is_suspended = 1;
679 spin_unlock_irq(&ts->lock);
685 static int xpt2046_resume(struct spi_device *spi)
687 struct xpt2046 *ts = dev_get_drvdata(&spi->dev);
689 spin_lock_irq(&ts->lock);
691 ts->is_suspended = 0;
694 spin_unlock_irq(&ts->lock);
699 static int __devinit setup_pendown(struct spi_device *spi, struct xpt2046 *ts)
701 struct xpt2046_platform_data *pdata = spi->dev.platform_data;
704 /* REVISIT when the irq can be triggered active-low, or if for some
705 * reason the touchscreen isn't hooked up, we don't need to access
708 if (!pdata->get_pendown_state && !gpio_is_valid(pdata->gpio_pendown)) {
709 dev_err(&spi->dev, "no get_pendown_state nor gpio_pendown?\n");
713 if (pdata->get_pendown_state) {
714 ts->get_pendown_state = pdata->get_pendown_state;
718 if (pdata->io_init) {
719 err = pdata->io_init();
721 dev_err(&spi->dev, "xpt2046 io_init fail\n");
724 err = gpio_request(pdata->gpio_pendown, "xpt2046_pendown");
726 dev_err(&spi->dev, "failed to request pendown GPIO%d\n",
727 pdata->gpio_pendown);
731 err = gpio_direction_input(pdata->gpio_pendown);
733 dev_err(&spi->dev, "failed to switch GPIO to input%d\n",
734 pdata->gpio_pendown);
738 gpio_pull_updown(pdata->gpio_pendown,GPIOPullUp);
740 ts->gpio_pendown = pdata->gpio_pendown;
745 static int __devinit xpt2046_probe(struct spi_device *spi)
748 struct xpt2046_packet *packet;
749 struct input_dev *input_dev;
750 struct xpt2046_platform_data *pdata = spi->dev.platform_data;
751 struct spi_message *m;
752 struct spi_transfer *x;
758 dev_dbg(&spi->dev, "no IRQ?\n");
762 spi->irq = gpio_to_irq(spi->irq);
763 dev_dbg(&spi->dev, "no IRQ?\n");
767 dev_err(&spi->dev, "empty platform_data\n");
771 /* don't exceed max specified sample rate */
772 if (spi->max_speed_hz > (125000 * SAMPLE_BITS)) {
773 dev_dbg(&spi->dev, "f(sample) %d KHz?\n",
774 (spi->max_speed_hz/SAMPLE_BITS)/1000);
778 /* We'd set TX wordsize 8 bits and RX wordsize to 13 bits ... except
779 * that even if the hardware can do that, the SPI controller driver
780 * may not. So we stick to very-portable 8 bit words, both RX and TX.
782 spi->bits_per_word = 8;
783 spi->mode = SPI_MODE_0;
784 err = spi_setup(spi);
788 ts = kzalloc(sizeof(struct xpt2046), GFP_KERNEL);
789 packet = kzalloc(sizeof(struct xpt2046_packet), GFP_KERNEL);
790 input_dev = input_allocate_device();
791 if (!ts || !packet || !input_dev) {
796 dev_set_drvdata(&spi->dev, ts);
800 ts->input = input_dev;
801 ts->swap_xy = pdata->swap_xy;
803 hrtimer_init(&ts->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
804 ts->timer.function = xpt2046_timer;
806 spin_lock_init(&ts->lock);
808 ts->model = pdata->model ? : 2046;
810 if (pdata->filter != NULL) {
811 if (pdata->filter_init != NULL) {
812 err = pdata->filter_init(pdata, &ts->filter_data);
816 ts->filter = pdata->filter;
817 ts->filter_cleanup = pdata->filter_cleanup;
818 } else if (pdata->debounce_max) {
819 ts->debounce_max = pdata->debounce_max;
820 if (ts->debounce_max < pdata->debounce_rep)
821 ts->debounce_max = pdata->debounce_rep;
822 ts->debounce_tol = pdata->debounce_tol;
823 ts->debounce_rep = pdata->debounce_rep;
824 ts->filter = xpt2046_debounce;
825 ts->filter_data = ts;
827 ts->filter = xpt2046_no_filter;
829 err = setup_pendown(spi, ts);
831 goto err_cleanup_filter;
833 if (pdata->penirq_recheck_delay_usecs)
834 ts->penirq_recheck_delay_usecs =
835 pdata->penirq_recheck_delay_usecs;
837 ts->wait_for_sync = pdata->wait_for_sync ? : null_wait_for_sync;
839 snprintf(ts->phys, sizeof(ts->phys), "%s/input0", dev_name(&spi->dev));
840 snprintf(ts->name, sizeof(ts->name), "XPT%d Touchscreen", ts->model);
842 input_dev->name = ts->name;
843 input_dev->phys = ts->phys;
844 input_dev->dev.parent = &spi->dev;
846 input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
847 input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
849 for (i = 0; i < ARRAY_SIZE(panel_key_info); i++)
850 set_bit(panel_key_info[i].key, input_dev->keybit);
851 clear_bit(0, input_dev->keybit);
853 input_set_abs_params(input_dev, ABS_X,
855 pdata->x_max ? : MAX_12BIT,
857 input_set_abs_params(input_dev, ABS_Y,
859 pdata->y_max ? : MAX_12BIT,
862 vref = pdata->keep_vref_on;
864 /* set up the transfers to read touchscreen state; this assumes we
865 * use formula #2 for pressure, not #3.
872 /* y- still on; turn on only y+ (and ADC) */
873 packet->read_y = READ_Y(vref);
874 xpt2046printk("-------------read Y 0x%x\n",packet->read_y); //add by zhao
875 x->tx_buf = &packet->read_y;
877 spi_message_add_tail(x, m);
880 x->rx_buf = &packet->tc.y;
882 spi_message_add_tail(x, m);
884 m->complete = xpt2046_rx_val;
890 /* turn y- off, x+ on, then leave in lowpower */
892 packet->read_x = READ_X(vref);
893 xpt2046printk("-------------read X 0x%x\n",packet->read_x); //add by zhao
894 x->tx_buf = &packet->read_x;
896 spi_message_add_tail(x, m);
899 x->rx_buf = &packet->tc.x;
901 spi_message_add_tail(x, m);
903 m->complete = xpt2046_rx_val;
911 packet->pwrdown = PWRDOWN;
912 x->tx_buf = &packet->pwrdown;
914 spi_message_add_tail(x, m);
917 x->rx_buf = &packet->dummy;
920 spi_message_add_tail(x, m);
922 m->complete = xpt2046_rx;
926 xpt2046printk("***>%s:touchscreen irq %d\n",__FUNCTION__,spi->irq);
927 if (request_irq(spi->irq, xpt2046_irq, IRQF_TRIGGER_FALLING,
928 spi->dev.driver->name, ts)) {
929 printk("%s:trying pin change workaround on irq %d\n",__FUNCTION__,spi->irq);
930 err = request_irq(spi->irq, xpt2046_irq,
931 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
932 spi->dev.driver->name, ts);
934 dev_dbg(&spi->dev, "irq %d busy?\n", spi->irq);
939 /* take a first sample, leaving nPENIRQ active and vREF off; avoid
940 * the touchscreen, in case it's not connected.
942 xpt2046_read12_dfr(&spi->dev,READ_X(1));
944 err = input_register_device(input_dev);
946 goto err_remove_attr_group;
947 printk("xpt2046_ts: driver initialized\n");
950 err_remove_attr_group:
951 free_irq(spi->irq, ts);
953 if (ts->gpio_pendown != -1)
954 gpio_free(ts->gpio_pendown);
956 if (ts->filter_cleanup)
957 ts->filter_cleanup(ts->filter_data);
959 input_free_device(input_dev);
965 static int __devexit xpt2046_remove(struct spi_device *spi)
967 struct xpt2046 *ts = dev_get_drvdata(&spi->dev);
969 input_unregister_device(ts->input);
971 xpt2046_suspend(spi, PMSG_SUSPEND);
973 free_irq(ts->spi->irq, ts);
974 /* suspend left the IRQ disabled */
975 enable_irq(ts->spi->irq);
977 if (ts->gpio_pendown != -1)
978 gpio_free(ts->gpio_pendown);
980 if (ts->filter_cleanup)
981 ts->filter_cleanup(ts->filter_data);
986 dev_dbg(&spi->dev, "unregistered touchscreen\n");
990 static struct spi_driver xpt2046_driver = {
992 .name = "xpt2046_ts",
993 .bus = &spi_bus_type,
994 .owner = THIS_MODULE,
996 .probe = xpt2046_probe,
997 .remove = __devexit_p(xpt2046_remove),
998 .suspend = xpt2046_suspend,
999 .resume = xpt2046_resume,
1002 static int __init xpt2046_init(void)
1004 return spi_register_driver(&xpt2046_driver);
1006 late_initcall_sync(xpt2046_init);
1008 static void __exit xpt2046_exit(void)
1010 spi_unregister_driver(&xpt2046_driver);
1012 module_exit(xpt2046_exit);
1014 MODULE_DESCRIPTION("rk2818 spi xpt2046 TouchScreen Driver");
1015 MODULE_LICENSE("GPL");
1016 MODULE_ALIAS("spi:xpt2046");