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>
26 #include <mach/iomux.h>
27 #ifdef CONFIG_HAS_EARLYSUSPEND
28 #include <linux/earlysuspend.h>
30 #include "xpt2046_ts.h"
33 * This code has been heavily tested on a Nokia 770, and lightly
34 * tested on other xpt2046 devices (OSK/Mistral, Lubbock).
35 * TSC2046 is just newer xpt2046 silicon.
36 * Support for ads7843 tested on Atmel at91sam926x-EK.
37 * Support for ads7845 has only been stubbed in.
39 * IRQ handling needs a workaround because of a shortcoming in handling
40 * edge triggered IRQs on some platforms like the OMAP1/2. These
41 * platforms don't handle the ARM lazy IRQ disabling properly, thus we
42 * have to maintain our own SW IRQ disabled status. This should be
43 * removed as soon as the affected platform's IRQ handling is fixed.
45 * app note sbaa036 talks in more detail about accurate sampling...
46 * that ought to help in situations like LCDs inducing noise (which
47 * can also be helped by using synch signals) and more generally.
48 * This driver tries to utilize the measures described in the app
49 * note. The strength of filtering can be set in the board-* specific
52 #define XPT2046_DEBUG 0
54 #define xpt2046printk(msg...) printk(msg);
56 #define xpt2046printk(msg...)
59 #define TS_POLL_DELAY (10 * 1000000) /* ns delay before the first sample */
60 #define TS_POLL_PERIOD (20 * 1000000) /* ns delay between samples */
62 /* this driver doesn't aim at the peak continuous sample rate */
63 #define SAMPLE_BITS (8 /*cmd*/ + 16 /*sample*/ + 2 /* before, after */)
66 /* For portability, we can't read 12 bit values using SPI (which
67 * would make the controller deliver them as native byteorder u16
68 * with msbs zeroed). Instead, we read them as two 8-bit values,
69 * *** WHICH NEED BYTESWAPPING *** and range adjustment.
77 * We allocate this separately to avoid cache line sharing issues when
78 * driver is used with DMA-based SPI controllers (like atmel_spi) on
79 * systems where main memory is not DMA-coherent (most non-x86 boards).
81 struct xpt2046_packet {
82 u8 read_x, read_y, pwrdown;
83 u16 dummy; /* for the pwrdown read */
88 struct input_dev *input;
91 char pendown_iomux_name[IOMUX_NAME_SIZE];
92 struct spi_device *spi;
100 u16 penirq_recheck_delay_usecs;
103 struct xpt2046_packet *packet;
105 struct spi_transfer xfer[18];
106 struct spi_message msg[5];
107 struct spi_message *last_msg;
112 int pendown_iomux_mode;
117 int touch_virtualkey_length;
119 struct hrtimer timer;
120 unsigned pendown:1; /* P: lock */
121 unsigned pending:1; /* P: lock */
122 // FIXME remove "irq_disabled"
123 unsigned irq_disabled:1; /* P: lock */
125 unsigned is_suspended:1;
127 int (*filter)(void *data, int data_idx, int *val);
129 void (*filter_cleanup)(void *data);
130 int (*get_pendown_state)(void);
133 void (*wait_for_sync)(void);
134 #ifdef CONFIG_HAS_EARLYSUSPEND
135 struct early_suspend early_suspend;
139 /* leave chip selected when we're done, for quicker re-select? */
141 #define CS_CHANGE(xfer) ((xfer).cs_change = 1)
143 #define CS_CHANGE(xfer) ((xfer).cs_change = 0)
146 /*--------------------------------------------------------------------------*/
148 /* The xpt2046 has touchscreen and other sensors.
149 * Earlier xpt2046 chips are somewhat compatible.
151 #define XPT2046_START (1 << 7)
152 #define XPT2046_A2A1A0_d_y (1 << 4) /* differential */
153 #define XPT2046_A2A1A0_d_z1 (3 << 4) /* differential */
154 #define XPT2046_A2A1A0_d_z2 (4 << 4) /* differential */
155 #define XPT2046_A2A1A0_d_x (5 << 4) /* differential */
156 #define XPT2046_A2A1A0_temp0 (0 << 4) /* non-differential */
157 #define XPT2046_A2A1A0_vbatt (2 << 4) /* non-differential */
158 #define XPT2046_A2A1A0_vaux (6 << 4) /* non-differential */
159 #define XPT2046_A2A1A0_temp1 (7 << 4) /* non-differential */
160 #define XPT2046_8_BIT (1 << 3)
161 #define XPT2046_12_BIT (0 << 3)
162 #define XPT2046_SER (1 << 2) /* non-differential */
163 #define XPT2046_DFR (0 << 2) /* differential */
164 #define XPT2046_PD10_PDOWN (0 << 0) /* lowpower mode + penirq */
165 #define XPT2046_PD10_ADC_ON (1 << 0) /* ADC on */
166 #define XPT2046_PD10_REF_ON (2 << 0) /* vREF on + penirq */
167 #define XPT2046_PD10_ALL_ON (3 << 0) /* ADC + vREF on */
169 #define MAX_12BIT ((1<<12)-1)
171 /* leave ADC powered up (disables penirq) between differential samples */
172 #define READ_12BIT_DFR(x, adc, vref) (XPT2046_START | XPT2046_A2A1A0_d_ ## x \
173 | XPT2046_12_BIT | XPT2046_DFR | \
174 (adc ? XPT2046_PD10_ADC_ON : 0) | (vref ? XPT2046_PD10_REF_ON : 0))
176 #define READ_Y(vref) (READ_12BIT_DFR(y, 1, vref))
177 #define READ_Z1(vref) (READ_12BIT_DFR(z1, 1, vref))
178 #define READ_Z2(vref) (READ_12BIT_DFR(z2, 1, vref))
180 #define READ_X(vref) (READ_12BIT_DFR(x, 1, vref))
181 #define PWRDOWN (READ_12BIT_DFR(y, 0, 0)) /* LAST */
183 /* single-ended samples need to first power up reference voltage;
184 * we leave both ADC and VREF powered
186 #define READ_12BIT_SER(x) (XPT2046_START | XPT2046_A2A1A0_ ## x \
187 | XPT2046_12_BIT | XPT2046_SER)
189 #define REF_ON (READ_12BIT_DFR(x, 1, 1))
190 #define REF_OFF (READ_12BIT_DFR(y, 0, 0))
192 /*--------------------------------------------------------------------------*/
194 * touchscreen sensors use differential conversions.
200 u16 dummy; /* for the pwrdown read */
202 struct spi_message msg;
203 struct spi_transfer xfer[4];
206 static void xpt2046_enable(struct xpt2046 *ts);
207 static void xpt2046_disable(struct xpt2046 *ts);
208 static int xpt2046_verifyAndConvert(struct xpt2046 *ts,u16 adx, u16 ady,u16 *x, u16 *y)
210 *x = ts->x_max * (ts->touch_ad_left - adx)/(ts->touch_ad_left - ts->touch_ad_right);
211 *y = ts->y_max * (ts->touch_ad_top - ady)/(ts->touch_ad_top - ts->touch_ad_bottom);
213 xpt2046printk("%s:(%d/%d)\n",__FUNCTION__,*x, *y);
215 if((*x< ts->x_min) || (*x > ts->x_max))
218 if((*y< ts->y_min) || (*y > ts->y_max + ts->touch_virtualkey_length))
224 static int device_suspended(struct device *dev)
226 struct xpt2046 *ts = dev_get_drvdata(dev);
227 return ts->is_suspended || ts->disabled;
230 static int xpt2046_read12_dfr(struct device *dev, unsigned command)
232 struct spi_device *spi = to_spi_device(dev);
233 struct xpt2046 *ts = dev_get_drvdata(dev);
234 struct dfr_req *req = kzalloc(sizeof *req, GFP_KERNEL);
240 spi_message_init(&req->msg);
243 req->command = (u8) command;
244 req->xfer[0].tx_buf = &req->command;
245 req->xfer[0].len = 1;
246 spi_message_add_tail(&req->xfer[0], &req->msg);
248 req->xfer[1].rx_buf = &req->sample;
249 req->xfer[1].len = 2;
250 spi_message_add_tail(&req->xfer[1], &req->msg);
252 /* converter in low power mode & enable PENIRQ */
253 req->pwrdown= PWRDOWN;
254 req->xfer[2].tx_buf = &req->pwrdown;
255 req->xfer[2].len = 1;
256 spi_message_add_tail(&req->xfer[2], &req->msg);
258 req->xfer[3].rx_buf = &req->dummy;
259 req->xfer[3].len = 2;
260 CS_CHANGE(req->xfer[3]);
261 spi_message_add_tail(&req->xfer[3], &req->msg);
263 ts->irq_disabled = 1;
264 disable_irq(spi->irq);
265 status = spi_sync(spi, &req->msg);
266 ts->irq_disabled = 0;
267 enable_irq(spi->irq);
270 /* on-wire is a must-ignore bit, a BE12 value, then padding */
271 status = be16_to_cpu(req->sample);
272 status = status >> 3;
274 xpt2046printk("***>%s:status=%d\n",__FUNCTION__,status);
283 /*--------------------------------------------------------------------------*/
285 static int get_pendown_state(struct xpt2046 *ts)
287 if (ts->get_pendown_state)
288 return ts->get_pendown_state();
290 return !gpio_get_value(ts->gpio_pendown);
293 static void null_wait_for_sync(void)
299 * PENIRQ only kicks the timer. The timer only reissues the SPI transfer,
300 * to retrieve touchscreen status.
302 * The SPI transfer completion callback does the real work. It reports
303 * touchscreen events and reactivates the timer (or IRQ) as appropriate.
305 static void xpt2046_rx(void *xpt)
307 struct xpt2046 *ts = xpt;
308 struct xpt2046_packet *packet = ts->packet;
312 /* xpt2046_rx_val() did in-place conversion (including byteswap) from
313 * on-the-wire format as part of debouncing to get stable readings.
318 xpt2046printk("***>%s:x=%d,y=%d\n",__FUNCTION__,x,y);
320 /* range filtering */
324 /* Sample found inconsistent by debouncing or pressure is beyond
325 * the maximum. Don't report it to user space, repeat at least
326 * once more the measurement
328 if (packet->tc.ignore) {
330 xpt2046printk("***>%s:ignored=%d\n",__FUNCTION__,packet->tc.ignore);
332 hrtimer_start(&ts->timer, ktime_set(0, TS_POLL_PERIOD),
337 /* Maybe check the pendown state before reporting. This discards
338 * false readings when the pen is lifted.
340 if (ts->penirq_recheck_delay_usecs) {
341 udelay(ts->penirq_recheck_delay_usecs);
342 if (!get_pendown_state(ts))
344 xpt2046printk("***>%s:get_pendown_state(ts)==0,discard false reading\n",__FUNCTION__);
349 /* NOTE: We can't rely on the pressure to determine the pen down
350 * state, even this controller has a pressure sensor. The pressure
351 * value can fluctuate for quite a while after lifting the pen and
352 * in some cases may not even settle at the expected value.
354 * The only safe way to check for the pen up condition is in the
355 * timer by reading the pen signal state (it's a GPIO _and_ IRQ).
358 struct input_dev *input = ts->input;
363 if(xpt2046_verifyAndConvert(ts,x,y,&x,&y))
365 xpt2046printk("***>%s:xpt2046_verifyAndConvert fail\n",__FUNCTION__);
370 input_report_key(input, BTN_TOUCH, 1);
372 xpt2046printk("***>%s:input_report_key(pen down)\n",__FUNCTION__);
375 input_report_abs(input, ABS_X, x);
376 input_report_abs(input, ABS_Y, y);
379 xpt2046printk("***>%s:input_report_abs(%4d/%4d)\n",__FUNCTION__,x, y);
382 hrtimer_start(&ts->timer, ktime_set(0, TS_POLL_PERIOD),
386 static int xpt2046_debounce(void *xpt, int data_idx, int *val)
388 struct xpt2046 *ts = xpt;
389 static int average_val[2];
392 xpt2046printk("***>%s:%d,%d,%d,%d,%d,%d,%d,%d\n",__FUNCTION__,
393 data_idx,ts->last_read,
394 ts->read_cnt,ts->debounce_max,
395 abs(ts->last_read - *val),ts->debounce_tol,
396 ts->read_rep,ts->debounce_rep);
398 /* discard the first sample. */
399 //on info_it50, the top-left area(1cmx1cm top-left square ) is not responding cause the first sample is invalid, @sep 17th
404 return XPT2046_FILTER_REPEAT;
406 if(*val == 4095 || *val == 0)
410 memset(average_val,0,sizeof(average_val));
411 xpt2046printk("***>%s:*val == 4095 || *val == 0\n",__FUNCTION__);
412 return XPT2046_FILTER_IGNORE;
416 if (ts->read_cnt==1 || (abs(ts->last_read - *val) > ts->debounce_tol)) {
417 /* Start over collecting consistent readings. */
419 average_val[data_idx] = *val;
420 /* Repeat it, if this was the first read or the read
421 * wasn't consistent enough. */
422 if (ts->read_cnt < ts->debounce_max) {
423 ts->last_read = *val;
425 return XPT2046_FILTER_REPEAT;
427 /* Maximum number of debouncing reached and still
428 * not enough number of consistent readings. Abort
429 * the whole sample, repeat it in the next sampling
434 memset(average_val,0,sizeof(average_val));
435 xpt2046printk("***>%s:XPT2046_FILTER_IGNORE\n",__FUNCTION__);
436 return XPT2046_FILTER_IGNORE;
440 average_val[data_idx] += *val;
442 if (++ts->read_rep >= ts->debounce_rep) {
443 /* Got a good reading for this coordinate,
444 * go for the next one. */
448 *val = average_val[data_idx]/(ts->debounce_rep);
449 return XPT2046_FILTER_OK;
451 /* Read more values that are consistent. */
454 return XPT2046_FILTER_REPEAT;
459 static int xpt2046_no_filter(void *xpt, int data_idx, int *val)
461 return XPT2046_FILTER_OK;
464 //#define spi_async(a,b)
465 static void xpt2046_rx_val(void *xpt)
467 struct xpt2046 *ts = xpt;
468 struct xpt2046_packet *packet = ts->packet;
469 struct spi_message *m;
470 struct spi_transfer *t;
475 m = &ts->msg[ts->msg_idx];
476 t = list_entry(m->transfers.prev, struct spi_transfer, transfer_list);
478 /* adjust: on-wire is a must-ignore bit, a BE12 value, then padding;
479 * built from two 8 bit values written msb-first.
481 val = (be16_to_cpup((__be16 *)t->rx_buf) >> 3) & 0x0fff;
483 xpt2046printk("***>%s:value=%d\n",__FUNCTION__,val);
485 action = ts->filter(ts->filter_data, ts->msg_idx, &val);
487 case XPT2046_FILTER_REPEAT:
489 case XPT2046_FILTER_IGNORE:
490 packet->tc.ignore = 1;
491 /* Last message will contain xpt2046_rx() as the
492 * completion function.
496 case XPT2046_FILTER_OK:
497 *(u16 *)t->rx_buf = val;
498 packet->tc.ignore = 0;
499 m = &ts->msg[++ts->msg_idx];
505 status = spi_async(ts->spi, m);
507 dev_err(&ts->spi->dev, "spi_async --> %d\n",
511 static enum hrtimer_restart xpt2046_timer(struct hrtimer *handle)
513 struct xpt2046 *ts = container_of(handle, struct xpt2046, timer);
516 spin_lock(&ts->lock);
518 if (unlikely(!get_pendown_state(ts) ||
519 device_suspended(&ts->spi->dev))) {
521 struct input_dev *input = ts->input;
522 input_report_key(input, BTN_TOUCH, 0);
527 xpt2046printk("***>%s:input_report_key(The touchscreen up)\n",__FUNCTION__);
530 /* measurement cycle ended */
531 if (!device_suspended(&ts->spi->dev)) {
532 xpt2046printk("***>%s:device_suspended==0\n",__FUNCTION__);
533 ts->irq_disabled = 0;
534 enable_irq(ts->spi->irq);
538 /* pen is still down, continue with the measurement */
539 xpt2046printk("***>%s:pen is still down, continue with the measurement\n",__FUNCTION__);
542 status = spi_async(ts->spi, &ts->msg[0]);
544 dev_err(&ts->spi->dev, "spi_async --> %d\n", status);
547 spin_unlock(&ts->lock);
548 return HRTIMER_NORESTART;
551 static irqreturn_t xpt2046_irq(int irq, void *handle)
553 struct xpt2046 *ts = handle;
556 xpt2046printk("***>%s.....%s.....%d\n",__FILE__,__FUNCTION__,__LINE__);
558 spin_lock_irqsave(&ts->lock, flags);
560 if (likely(get_pendown_state(ts))) {
561 if (!ts->irq_disabled) {
562 /* The ARM do_simple_IRQ() dispatcher doesn't act
563 * like the other dispatchers: it will report IRQs
564 * even after they've been disabled. We work around
565 * that here. (The "generic irq" framework may help...)
567 ts->irq_disabled = 1;
568 disable_irq_nosync(ts->spi->irq);
570 hrtimer_start(&ts->timer, ktime_set(0, TS_POLL_DELAY),
574 spin_unlock_irqrestore(&ts->lock, flags);
579 /*--------------------------------------------------------------------------*/
581 /* Must be called with ts->lock held */
582 static void xpt2046_disable(struct xpt2046 *ts)
589 /* are we waiting for IRQ, or polling? */
591 ts->irq_disabled = 1;
592 disable_irq(ts->spi->irq);
594 /* the timer will run at least once more, and
595 * leave everything in a clean state, IRQ disabled
597 while (ts->pending) {
598 spin_unlock_irq(&ts->lock);
600 spin_lock_irq(&ts->lock);
604 /* we know the chip's in lowpower mode since we always
605 * leave it that way after every request
609 /* Must be called with ts->lock held */
610 static void xpt2046_enable(struct xpt2046 *ts)
616 ts->irq_disabled = 0;
617 enable_irq(ts->spi->irq);
620 static int xpt2046_pSuspend(struct xpt2046 *ts)
622 spin_lock_irq(&ts->lock);
624 ts->is_suspended = 1;
627 spin_unlock_irq(&ts->lock);
632 static int xpt2046_pResume(struct xpt2046 *ts)
634 spin_lock_irq(&ts->lock);
636 ts->is_suspended = 0;
639 spin_unlock_irq(&ts->lock);
644 #if !defined(CONFIG_HAS_EARLYSUSPEND)
645 static int xpt2046_suspend(struct spi_device *spi, pm_message_t message)
647 struct xpt2046 *ts = dev_get_drvdata(&spi->dev);
649 printk("xpt2046_suspend\n");
651 xpt2046_pSuspend(ts);
656 static int xpt2046_resume(struct spi_device *spi)
658 struct xpt2046 *ts = dev_get_drvdata(&spi->dev);
660 printk("xpt2046_resume\n");
667 #elif defined(CONFIG_HAS_EARLYSUSPEND)
668 static void xpt2046_early_suspend(struct early_suspend *h)
671 ts = container_of(h, struct xpt2046, early_suspend);
673 printk("xpt2046_suspend early\n");
675 xpt2046_pSuspend(ts);
680 static void xpt2046_late_resume(struct early_suspend *h)
683 ts = container_of(h, struct xpt2046, early_suspend);
685 printk("xpt2046_resume late\n");
693 static int __devinit setup_pendown(struct spi_device *spi, struct xpt2046 *ts)
695 struct xpt2046_platform_data *pdata = spi->dev.platform_data;
698 /* REVISIT when the irq can be triggered active-low, or if for some
699 * reason the touchscreen isn't hooked up, we don't need to access
702 if (!pdata->get_pendown_state && !gpio_is_valid(pdata->gpio_pendown)) {
703 dev_err(&spi->dev, "no get_pendown_state nor gpio_pendown?\n");
707 if (pdata->get_pendown_state) {
708 ts->get_pendown_state = pdata->get_pendown_state;
712 if (pdata->io_init) {
713 err = pdata->io_init();
715 dev_err(&spi->dev, "xpt2046 io_init fail\n");
718 ts->gpio_pendown = pdata->gpio_pendown;
719 strcpy(ts->pendown_iomux_name,pdata->pendown_iomux_name);
720 ts->pendown_iomux_mode = pdata->pendown_iomux_mode;
722 rk29_mux_api_set(ts->pendown_iomux_name,pdata->pendown_iomux_mode);
723 err = gpio_request(pdata->gpio_pendown, "xpt2046_pendown");
725 dev_err(&spi->dev, "failed to request pendown GPIO%d\n",
726 pdata->gpio_pendown);
730 err = gpio_pull_updown(pdata->gpio_pendown, GPIOPullUp);
732 dev_err(&spi->dev, "failed to pullup pendown GPIO%d\n",
733 pdata->gpio_pendown);
736 ts->gpio_pendown = pdata->gpio_pendown;
740 static int __devinit xpt2046_probe(struct spi_device *spi)
743 struct xpt2046_packet *packet;
744 struct input_dev *input_dev;
745 struct xpt2046_platform_data *pdata = spi->dev.platform_data;
746 struct spi_message *m;
747 struct spi_transfer *x;
752 dev_dbg(&spi->dev, "no IRQ?\n");
756 spi->irq = gpio_to_irq(spi->irq);
757 dev_dbg(&spi->dev, "no IRQ?\n");
761 dev_err(&spi->dev, "empty platform_data\n");
765 /* don't exceed max specified sample rate */
766 if (spi->max_speed_hz > (125000 * SAMPLE_BITS)) {
767 dev_dbg(&spi->dev, "f(sample) %d KHz?\n",
768 (spi->max_speed_hz/SAMPLE_BITS)/1000);
772 /* We'd set TX wordsize 8 bits and RX wordsize to 13 bits ... except
773 * that even if the hardware can do that, the SPI controller driver
774 * may not. So we stick to very-portable 8 bit words, both RX and TX.
776 spi->bits_per_word = 8;
777 spi->mode = SPI_MODE_0;
778 err = spi_setup(spi);
782 ts = kzalloc(sizeof(struct xpt2046), GFP_KERNEL);
783 packet = kzalloc(sizeof(struct xpt2046_packet), GFP_KERNEL);
784 input_dev = input_allocate_device();
785 if (!ts || !packet || !input_dev) {
790 dev_set_drvdata(&spi->dev, ts);
794 ts->input = input_dev;
795 ts->swap_xy = pdata->swap_xy;
797 hrtimer_init(&ts->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
798 ts->timer.function = xpt2046_timer;
800 spin_lock_init(&ts->lock);
802 ts->model = pdata->model ? : 2046;
804 if (pdata->filter != NULL) {
805 if (pdata->filter_init != NULL) {
806 err = pdata->filter_init(pdata, &ts->filter_data);
810 ts->filter = pdata->filter;
811 ts->filter_cleanup = pdata->filter_cleanup;
812 } else if (pdata->debounce_max) {
813 ts->debounce_max = pdata->debounce_max;
814 if (ts->debounce_max < pdata->debounce_rep)
815 ts->debounce_max = pdata->debounce_rep;
816 ts->debounce_tol = pdata->debounce_tol;
817 ts->debounce_rep = pdata->debounce_rep;
818 ts->filter = xpt2046_debounce;
819 ts->filter_data = ts;
821 ts->filter = xpt2046_no_filter;
823 err = setup_pendown(spi, ts);
825 goto err_cleanup_filter;
827 if (pdata->penirq_recheck_delay_usecs)
828 ts->penirq_recheck_delay_usecs =
829 pdata->penirq_recheck_delay_usecs;
831 ts->wait_for_sync = pdata->wait_for_sync ? : null_wait_for_sync;
832 ts->x_min = pdata->x_min;
833 ts->x_max = pdata->x_max;
834 ts->y_min = pdata->y_min;
835 ts->y_max = pdata->y_max;
837 ts->touch_ad_top = pdata->touch_ad_top;
838 ts->touch_ad_bottom= pdata->touch_ad_bottom;
839 ts->touch_ad_left= pdata->touch_ad_left;
840 ts->touch_ad_right= pdata->touch_ad_right;
842 ts->touch_virtualkey_length = pdata->touch_virtualkey_length;
844 snprintf(ts->phys, sizeof(ts->phys), "%s/input0", dev_name(&spi->dev));
845 snprintf(ts->name, sizeof(ts->name), "xpt%d-touchscreen", ts->model);
847 input_dev->name = ts->name;
848 input_dev->phys = ts->phys;
849 input_dev->dev.parent = &spi->dev;
851 input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
852 input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
853 input_set_abs_params(input_dev, ABS_X,
855 ts->x_max ? : MAX_12BIT,
857 input_set_abs_params(input_dev, ABS_Y,
859 ts->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 x->tx_buf = &packet->read_y;
876 spi_message_add_tail(x, m);
879 x->rx_buf = &packet->tc.y;
881 spi_message_add_tail(x, m);
883 m->complete = xpt2046_rx_val;
889 /* turn y- off, x+ on, then leave in lowpower */
891 packet->read_x = READ_X(vref);
892 x->tx_buf = &packet->read_x;
894 spi_message_add_tail(x, m);
897 x->rx_buf = &packet->tc.x;
899 spi_message_add_tail(x, m);
901 m->complete = xpt2046_rx_val;
909 packet->pwrdown = PWRDOWN;
910 x->tx_buf = &packet->pwrdown;
912 spi_message_add_tail(x, m);
915 x->rx_buf = &packet->dummy;
918 spi_message_add_tail(x, m);
920 m->complete = xpt2046_rx;
925 if (request_irq(spi->irq, xpt2046_irq, IRQF_TRIGGER_FALLING,
926 spi->dev.driver->name, ts)) {
927 xpt2046printk("%s:trying pin change workaround on irq %d\n",__FUNCTION__,spi->irq);
928 err = request_irq(spi->irq, xpt2046_irq,
929 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
930 spi->dev.driver->name, ts);
932 dev_dbg(&spi->dev, "irq %d busy?\n", spi->irq);
936 xpt2046printk("***>%s:touchscreen irq %d\n",__FUNCTION__,spi->irq);
938 /* take a first sample, leaving nPENIRQ active and vREF off; avoid
939 * the touchscreen, in case it's not connected.
941 xpt2046_read12_dfr(&spi->dev,READ_X(1));
943 err = input_register_device(input_dev);
945 goto err_remove_attr_group;
947 #ifdef CONFIG_HAS_EARLYSUSPEND
948 ts->early_suspend.suspend = xpt2046_early_suspend;
949 ts->early_suspend.resume = xpt2046_late_resume;
950 ts->early_suspend.level = EARLY_SUSPEND_LEVEL_BLANK_SCREEN + 1;
951 register_early_suspend(&ts->early_suspend);
954 xpt2046printk("xpt2046_ts: driver initialized\n");
957 err_remove_attr_group:
958 free_irq(spi->irq, ts);
960 if (ts->gpio_pendown != -1)
961 gpio_free(ts->gpio_pendown);
963 if (ts->filter_cleanup)
964 ts->filter_cleanup(ts->filter_data);
966 input_free_device(input_dev);
972 static int __devexit xpt2046_remove(struct spi_device *spi)
974 struct xpt2046 *ts = dev_get_drvdata(&spi->dev);
976 input_unregister_device(ts->input);
978 #if !defined(CONFIG_HAS_EARLYSUSPEND)
979 xpt2046_suspend(spi, PMSG_SUSPEND);
980 #elif defined(CONFIG_HAS_EARLYSUSPEND)
981 xpt2046_early_suspend(&ts->early_suspend);
982 unregister_early_suspend(&ts->early_suspend);
985 free_irq(ts->spi->irq, ts);
986 /* suspend left the IRQ disabled */
987 enable_irq(ts->spi->irq);
989 if (ts->gpio_pendown != -1)
990 gpio_free(ts->gpio_pendown);
992 if (ts->filter_cleanup)
993 ts->filter_cleanup(ts->filter_data);
998 dev_dbg(&spi->dev, "unregistered touchscreen\n");
1002 static struct spi_driver xpt2046_driver = {
1004 .name = "xpt2046_ts",
1005 .bus = &spi_bus_type,
1006 .owner = THIS_MODULE,
1008 .probe = xpt2046_probe,
1009 .remove = __devexit_p(xpt2046_remove),
1010 #ifndef CONFIG_HAS_EARLYSUSPEND
1011 .suspend = xpt2046_suspend,
1012 .resume = xpt2046_resume,
1015 extern int spi_register_driver(struct spi_driver *sdrv);
1016 static int __init xpt2046_init(void)
1018 return spi_register_driver(&xpt2046_driver);
1022 static void __exit xpt2046_exit(void)
1024 xpt2046printk("Touch panel drive XPT2046 driver exit...\n");
1025 spi_unregister_driver(&xpt2046_driver);
1027 module_init(xpt2046_init);
1028 module_exit(xpt2046_exit);
1030 MODULE_DESCRIPTION("rk29xx spi xpt2046 TouchScreen Driver");
1031 MODULE_LICENSE("GPL");
1032 MODULE_ALIAS("spi:xpt2046");