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_tslib_ts.h"
31 #include "ts_lib/tslib.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) /* ns delay before the first sample */
60 #define TS_POLL_PERIOD (20) /* 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 delayed_work d_work;
120 struct tslib_info tslib_info;
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);
135 #ifdef CONFIG_HAS_EARLYSUSPEND
136 struct early_suspend early_suspend;
140 /* leave chip selected when we're done, for quicker re-select? */
142 #define CS_CHANGE(xfer) ((xfer).cs_change = 1)
144 #define CS_CHANGE(xfer) ((xfer).cs_change = 0)
147 /*--------------------------------------------------------------------------*/
149 /* The xpt2046 has touchscreen and other sensors.
150 * Earlier xpt2046 chips are somewhat compatible.
152 #define XPT2046_START (1 << 7)
153 #define XPT2046_A2A1A0_d_y (1 << 4) /* differential */
154 #define XPT2046_A2A1A0_d_z1 (3 << 4) /* differential */
155 #define XPT2046_A2A1A0_d_z2 (4 << 4) /* differential */
156 #define XPT2046_A2A1A0_d_x (5 << 4) /* differential */
157 #define XPT2046_A2A1A0_temp0 (0 << 4) /* non-differential */
158 #define XPT2046_A2A1A0_vbatt (2 << 4) /* non-differential */
159 #define XPT2046_A2A1A0_vaux (6 << 4) /* non-differential */
160 #define XPT2046_A2A1A0_temp1 (7 << 4) /* non-differential */
161 #define XPT2046_8_BIT (1 << 3)
162 #define XPT2046_12_BIT (0 << 3)
163 #define XPT2046_SER (1 << 2) /* non-differential */
164 #define XPT2046_DFR (0 << 2) /* differential */
165 #define XPT2046_PD10_PDOWN (0 << 0) /* lowpower mode + penirq */
166 #define XPT2046_PD10_ADC_ON (1 << 0) /* ADC on */
167 #define XPT2046_PD10_REF_ON (2 << 0) /* vREF on + penirq */
168 #define XPT2046_PD10_ALL_ON (3 << 0) /* ADC + vREF on */
170 #define MAX_12BIT ((1<<12)-1)
172 /* leave ADC powered up (disables penirq) between differential samples */
173 #define READ_12BIT_DFR(x, adc, vref) (XPT2046_START | XPT2046_A2A1A0_d_ ## x \
174 | XPT2046_12_BIT | XPT2046_DFR | \
175 (adc ? XPT2046_PD10_ADC_ON : 0) | (vref ? XPT2046_PD10_REF_ON : 0))
177 #define READ_Y(vref) (READ_12BIT_DFR(y, 1, vref))
178 #define READ_Z1(vref) (READ_12BIT_DFR(z1, 1, vref))
179 #define READ_Z2(vref) (READ_12BIT_DFR(z2, 1, vref))
181 #define READ_X(vref) (READ_12BIT_DFR(x, 1, vref))
182 #define PWRDOWN (READ_12BIT_DFR(y, 0, 0)) /* LAST */
184 /* single-ended samples need to first power up reference voltage;
185 * we leave both ADC and VREF powered
187 #define READ_12BIT_SER(x) (XPT2046_START | XPT2046_A2A1A0_ ## x \
188 | XPT2046_12_BIT | XPT2046_SER)
190 #define REF_ON (READ_12BIT_DFR(x, 1, 1))
191 #define REF_OFF (READ_12BIT_DFR(y, 0, 0))
193 /*--------------------------------------------------------------------------*/
195 * touchscreen sensors use differential conversions.
201 u16 dummy; /* for the pwrdown read */
203 struct spi_message msg;
204 struct spi_transfer xfer[4];
206 static DECLARE_WAIT_QUEUE_HEAD(wq_ts);
207 static int wq_condition_ts = 1;
209 static void xpt2046_enable(struct xpt2046 *ts);
210 static void xpt2046_disable(struct xpt2046 *ts);
211 static int xpt2046_verifyAndConvert(struct xpt2046 *ts,int adx, int ady,int *x, int *y)
213 *x = ts->x_max * (ts->touch_ad_left - adx)/(ts->touch_ad_left - ts->touch_ad_right);
214 *y = ts->y_max * (ts->touch_ad_top - ady)/(ts->touch_ad_top - ts->touch_ad_bottom);
216 xpt2046printk("%s:(%d/%d)\n",__FUNCTION__,*x, *y);
218 if((*x< ts->x_min) || (*x > ts->x_max))
221 if((*y< ts->y_min) || (*y > ts->y_max + ts->touch_virtualkey_length))
227 static int device_suspended(struct device *dev)
229 struct xpt2046 *ts = dev_get_drvdata(dev);
230 return ts->is_suspended || ts->disabled;
233 static int xpt2046_read12_dfr(struct device *dev, unsigned command)
235 struct spi_device *spi = to_spi_device(dev);
236 struct xpt2046 *ts = dev_get_drvdata(dev);
237 struct dfr_req *req = kzalloc(sizeof *req, GFP_KERNEL);
243 spi_message_init(&req->msg);
246 req->command = (u8) command;
247 req->xfer[0].tx_buf = &req->command;
248 req->xfer[0].len = 1;
249 spi_message_add_tail(&req->xfer[0], &req->msg);
251 req->xfer[1].rx_buf = &req->sample;
252 req->xfer[1].len = 2;
253 spi_message_add_tail(&req->xfer[1], &req->msg);
255 /* converter in low power mode & enable PENIRQ */
256 req->pwrdown= PWRDOWN;
257 req->xfer[2].tx_buf = &req->pwrdown;
258 req->xfer[2].len = 1;
259 spi_message_add_tail(&req->xfer[2], &req->msg);
261 req->xfer[3].rx_buf = &req->dummy;
262 req->xfer[3].len = 2;
263 CS_CHANGE(req->xfer[3]);
264 spi_message_add_tail(&req->xfer[3], &req->msg);
266 ts->irq_disabled = 1;
267 disable_irq(spi->irq);
268 status = spi_sync(spi, &req->msg);
269 ts->irq_disabled = 0;
270 enable_irq(spi->irq);
273 /* on-wire is a must-ignore bit, a BE12 value, then padding */
274 status = be16_to_cpu(req->sample);
275 status = status >> 3;
277 xpt2046printk("***>%s:status=%d\n",__FUNCTION__,status);
286 /*--------------------------------------------------------------------------*/
288 static int get_pendown_state(struct xpt2046 *ts)
290 if (ts->get_pendown_state)
291 return ts->get_pendown_state();
293 return !gpio_get_value(ts->gpio_pendown);
296 static void null_wait_for_sync(void)
302 * PENIRQ only kicks the timer. The timer only reissues the SPI transfer,
303 * to retrieve touchscreen status.
305 * The SPI transfer completion callback does the real work. It reports
306 * touchscreen events and reactivates the timer (or IRQ) as appropriate.
308 static void xpt2046_rx(void *xpt)
310 /* xpt2046_rx_val() did in-place conversion (including byteswap) from
311 * on-the-wire format as part of debouncing to get stable readings.
319 static int xpt2046_debounce(void *xpt, int data_idx, int *val)
321 struct xpt2046 *ts = xpt;
322 static int average_val[2];
325 xpt2046printk("***>%s:%d,%d,%d,%d,%d,%d,%d,%d\n",__FUNCTION__,
326 data_idx,ts->last_read,
327 ts->read_cnt,ts->debounce_max,
328 abs(ts->last_read - *val),ts->debounce_tol,
329 ts->read_rep,ts->debounce_rep);
331 /* discard the first sample. */
332 //on info_it50, the top-left area(1cmx1cm top-left square ) is not responding cause the first sample is invalid, @sep 17th
337 return XPT2046_FILTER_REPEAT;
339 if(*val == 4095 || *val == 0)
343 memset(average_val,0,sizeof(average_val));
344 xpt2046printk("***>%s:*val == 4095 || *val == 0\n",__FUNCTION__);
345 return XPT2046_FILTER_IGNORE;
347 /* discard the first sample. */
351 return XPT2046_FILTER_REPEAT;
353 move discard ahead */
355 if (ts->read_cnt==1 || (abs(ts->last_read - *val) > ts->debounce_tol)) {
356 /* Start over collecting consistent readings. */
358 average_val[data_idx] = *val;
359 /* Repeat it, if this was the first read or the read
360 * wasn't consistent enough. */
361 if (ts->read_cnt < ts->debounce_max) {
362 ts->last_read = *val;
364 return XPT2046_FILTER_REPEAT;
366 /* Maximum number of debouncing reached and still
367 * not enough number of consistent readings. Abort
368 * the whole sample, repeat it in the next sampling
373 memset(average_val,0,sizeof(average_val));
374 xpt2046printk("***>%s:XPT2046_FILTER_IGNORE\n",__FUNCTION__);
375 return XPT2046_FILTER_IGNORE;
379 average_val[data_idx] += *val;
381 if (++ts->read_rep >= ts->debounce_rep) {
382 /* Got a good reading for this coordinate,
383 * go for the next one. */
387 *val = average_val[data_idx]/(ts->debounce_rep);
388 return XPT2046_FILTER_OK;
390 /* Read more values that are consistent. */
393 return XPT2046_FILTER_REPEAT;
398 static int xpt2046_no_filter(void *xpt, int data_idx, int *val)
400 return XPT2046_FILTER_OK;
403 static void xpt2046_rx_val(void *xpt)
405 struct xpt2046 *ts = xpt;
406 struct xpt2046_packet *packet = ts->packet;
407 struct spi_message *m;
408 struct spi_transfer *t;
413 m = &ts->msg[ts->msg_idx];
414 t = list_entry(m->transfers.prev, struct spi_transfer, transfer_list);
416 /* adjust: on-wire is a must-ignore bit, a BE12 value, then padding;
417 * built from two 8 bit values written msb-first.
419 val = (be16_to_cpup((__be16 *)t->rx_buf) >> 3) & 0x0fff;
421 xpt2046printk("***>%s:value=%d\n",__FUNCTION__,val);
423 action = ts->filter(ts->filter_data, ts->msg_idx, &val);
425 case XPT2046_FILTER_REPEAT:
427 case XPT2046_FILTER_IGNORE:
428 packet->tc.ignore = 1;
429 /* Last message will contain xpt2046_rx() as the
430 * completion function.
434 case XPT2046_FILTER_OK:
435 *(u16 *)t->rx_buf = val;
436 packet->tc.ignore = 0;
437 m = &ts->msg[++ts->msg_idx];
443 status = spi_async(ts->spi, m);
445 dev_err(&ts->spi->dev, "spi_async --> %d\n",
449 int xpt2046_get_raw_data(struct tslib_info *info, struct ts_sample *samp, int nr)
452 struct xpt2046 *ts = container_of((void *)info, struct xpt2046, tslib_info);
453 struct xpt2046_packet *packet = ts->packet;
455 memset(samp, 0, sizeof(struct ts_sample)*nr);
461 status = spi_async(ts->spi, &ts->msg[0]);
463 dev_err(&ts->spi->dev, "spi_async --> %d\n", status);
465 xpt2046printk("xpt2046_get_raw_data:wait_event \n");
466 if(!wait_event_timeout(wq_ts, wq_condition_ts, msecs_to_jiffies(100)))
474 samp->x = packet->tc.x;
475 samp->y = packet->tc.y;
476 samp->pressure = !(packet->tc.ignore);
477 //xpt2046printk("xpt2046_get_raw_data:samp->x=%d,samp->y=%d,samp->pressure=%d \n",
478 //samp->x,samp->y,samp->pressure);
482 static void xpt2046_report(struct xpt2046 *ts)
484 struct ts_sample samp[3];
485 struct xpt2046_packet *packet = ts->packet;
487 int x = 0,y =0,z = 0;
489 ret = dejitter_read(&ts->tslib_info, samp, 1);
491 xpt2046printk("***>%s:ret=%d,samp[0].x=%d,samp[0].y=%d,samp[0].pressure=%d\n",
492 __FUNCTION__,ret,samp[0].x,samp[0].y,samp[0].pressure);
496 z = samp[0].pressure;
499 x = (samp[0].x + samp[1].x) / 2;
500 y = (samp[0].y + samp[1].y) / 2;
501 z = (samp[0].pressure + samp[1].pressure) / 2;
504 x = (samp[0].x + samp[1].x + samp[2].x)/3;
505 y = (samp[0].y + samp[1].y + samp[2].y)/3;
506 z = (samp[0].pressure + samp[1].pressure + samp[2].pressure)/3;
509 printk("no sampe\n");
515 xpt2046printk("***>%s:z == 0\n",__FUNCTION__);
519 /* range filtering */
523 /* Sample found inconsistent by debouncing or pressure is beyond
524 * the maximum. Don't report it to user space, repeat at least
525 * once more the measurement
527 if (packet->tc.ignore) {
528 xpt2046printk("***>%s:ignored=%d\n",__FUNCTION__,packet->tc.ignore);
529 schedule_delayed_work(&ts->d_work, msecs_to_jiffies(TS_POLL_PERIOD));
533 /* Maybe check the pendown state before reporting. This discards
534 * false readings when the pen is lifted.
536 if (ts->penirq_recheck_delay_usecs) {
537 udelay(ts->penirq_recheck_delay_usecs);
538 if (!get_pendown_state(ts))
540 xpt2046printk("***>%s:get_pendown_state(ts)==0,discard false reading\n",__FUNCTION__);
545 /* NOTE: We can't rely on the pressure to determine the pen down
546 * state, even this controller has a pressure sensor. The pressure
547 * value can fluctuate for quite a while after lifting the pen and
548 * in some cases may not even settle at the expected value.
550 * The only safe way to check for the pen up condition is in the
551 * timer by reading the pen signal state (it's a GPIO _and_ IRQ).
554 struct input_dev *input = ts->input;
558 if(xpt2046_verifyAndConvert(ts,x,y,&x,&y))
560 xpt2046printk("***>%s:xpt2046_verifyAndConvert fail\n",__FUNCTION__);
565 input_report_key(input, BTN_TOUCH, 1);
567 xpt2046printk("***>%s:input_report_key(pen down)\n",__FUNCTION__);
570 input_report_abs(input, ABS_X, x);
571 input_report_abs(input, ABS_Y, y);
574 xpt2046printk("***>%s:input_report_abs(%4d/%4d)\n",__FUNCTION__,x, y);
578 schedule_delayed_work(&ts->d_work, msecs_to_jiffies(TS_POLL_PERIOD));
583 static void xpt2046_dwork_handler(struct work_struct *work)
585 struct xpt2046 *ts = (struct xpt2046 *)container_of(work, struct xpt2046, d_work.work);
587 spin_lock(&ts->lock);
589 if (unlikely(!get_pendown_state(ts) ||
590 device_suspended(&ts->spi->dev))) {
592 struct input_dev *input = ts->input;
593 variance_clear(&ts->tslib_info);
594 input_report_key(input, BTN_TOUCH, 0);
599 xpt2046printk("***>%s:input_report_key(The touchscreen up)\n",__FUNCTION__);
602 /* measurement cycle ended */
603 if (!device_suspended(&ts->spi->dev)) {
604 xpt2046printk("***>%s:device_suspended==0\n",__FUNCTION__);
605 ts->irq_disabled = 0;
606 enable_irq(ts->spi->irq);
610 /* pen is still down, continue with the measurement */
611 xpt2046printk("***>%s:pen is still down, continue with the measurement\n",__FUNCTION__);
612 spin_unlock(&ts->lock);
617 spin_unlock(&ts->lock);
620 static irqreturn_t xpt2046_irq(int irq, void *handle)
622 struct xpt2046 *ts = handle;
625 xpt2046printk("***>%s.....%s.....%d\n",__FILE__,__FUNCTION__,__LINE__);
627 spin_lock_irqsave(&ts->lock, flags);
629 if (likely(get_pendown_state(ts))) {
630 if (!ts->irq_disabled) {
631 /* The ARM do_simple_IRQ() dispatcher doesn't act
632 * like the other dispatchers: it will report IRQs
633 * even after they've been disabled. We work around
634 * that here. (The "generic irq" framework may help...)
636 ts->irq_disabled = 1;
637 disable_irq_nosync(ts->spi->irq);
639 schedule_delayed_work(&ts->d_work, msecs_to_jiffies(TS_POLL_DELAY));
642 spin_unlock_irqrestore(&ts->lock, flags);
647 /*--------------------------------------------------------------------------*/
649 /* Must be called with ts->lock held */
650 static void xpt2046_disable(struct xpt2046 *ts)
657 /* are we waiting for IRQ, or polling? */
659 ts->irq_disabled = 1;
660 disable_irq(ts->spi->irq);
662 /* the timer will run at least once more, and
663 * leave everything in a clean state, IRQ disabled
665 while (ts->pending) {
666 spin_unlock_irq(&ts->lock);
668 spin_lock_irq(&ts->lock);
672 /* we know the chip's in lowpower mode since we always
673 * leave it that way after every request
677 /* Must be called with ts->lock held */
678 static void xpt2046_enable(struct xpt2046 *ts)
684 ts->irq_disabled = 0;
685 enable_irq(ts->spi->irq);
688 static int xpt2046_pSuspend(struct xpt2046 *ts)
690 spin_lock_irq(&ts->lock);
692 ts->is_suspended = 1;
695 spin_unlock_irq(&ts->lock);
700 static int xpt2046_pResume(struct xpt2046 *ts)
702 spin_lock_irq(&ts->lock);
704 ts->is_suspended = 0;
707 spin_unlock_irq(&ts->lock);
712 #if !defined(CONFIG_HAS_EARLYSUSPEND)
713 static int xpt2046_suspend(struct spi_device *spi, pm_message_t message)
715 struct xpt2046 *ts = dev_get_drvdata(&spi->dev);
717 printk("xpt2046_suspend\n");
719 xpt2046_pSuspend(ts);
724 static int xpt2046_resume(struct spi_device *spi)
726 struct xpt2046 *ts = dev_get_drvdata(&spi->dev);
728 printk("xpt2046_resume\n");
735 #elif defined(CONFIG_HAS_EARLYSUSPEND)
736 static void xpt2046_early_suspend(struct early_suspend *h)
739 ts = container_of(h, struct xpt2046, early_suspend);
741 printk("xpt2046_suspend early\n");
743 xpt2046_pSuspend(ts);
748 static void xpt2046_late_resume(struct early_suspend *h)
751 ts = container_of(h, struct xpt2046, early_suspend);
753 printk("xpt2046_resume late\n");
761 static int __devinit setup_pendown(struct spi_device *spi, struct xpt2046 *ts)
763 struct xpt2046_platform_data *pdata = spi->dev.platform_data;
766 /* REVISIT when the irq can be triggered active-low, or if for some
767 * reason the touchscreen isn't hooked up, we don't need to access
770 if (!pdata->get_pendown_state && !gpio_is_valid(pdata->gpio_pendown)) {
771 dev_err(&spi->dev, "no get_pendown_state nor gpio_pendown?\n");
775 if (pdata->get_pendown_state) {
776 ts->get_pendown_state = pdata->get_pendown_state;
780 if (pdata->io_init) {
781 err = pdata->io_init();
783 dev_err(&spi->dev, "xpt2046 io_init fail\n");
786 ts->gpio_pendown = pdata->gpio_pendown;
787 strcpy(ts->pendown_iomux_name,pdata->pendown_iomux_name);
788 ts->pendown_iomux_mode = pdata->pendown_iomux_mode;
790 rk29_mux_api_set(ts->pendown_iomux_name,pdata->pendown_iomux_mode);
791 err = gpio_request(pdata->gpio_pendown, "xpt2046_pendown");
793 dev_err(&spi->dev, "failed to request pendown GPIO%d\n",
794 pdata->gpio_pendown);
798 err = gpio_pull_updown(pdata->gpio_pendown, GPIOPullUp);
800 dev_err(&spi->dev, "failed to pullup pendown GPIO%d\n",
801 pdata->gpio_pendown);
804 ts->gpio_pendown = pdata->gpio_pendown;
808 static int __devinit xpt2046_probe(struct spi_device *spi)
811 struct xpt2046_packet *packet;
812 struct input_dev *input_dev;
813 struct xpt2046_platform_data *pdata = spi->dev.platform_data;
814 struct spi_message *m;
815 struct spi_transfer *x;
820 dev_dbg(&spi->dev, "no IRQ?\n");
824 spi->irq = gpio_to_irq(spi->irq);
825 dev_dbg(&spi->dev, "no IRQ?\n");
829 dev_err(&spi->dev, "empty platform_data\n");
833 /* don't exceed max specified sample rate */
834 if (spi->max_speed_hz > (125000 * SAMPLE_BITS)) {
835 dev_dbg(&spi->dev, "f(sample) %d KHz?\n",
836 (spi->max_speed_hz/SAMPLE_BITS)/1000);
840 /* We'd set TX wordsize 8 bits and RX wordsize to 13 bits ... except
841 * that even if the hardware can do that, the SPI controller driver
842 * may not. So we stick to very-portable 8 bit words, both RX and TX.
844 spi->bits_per_word = 8;
845 spi->mode = SPI_MODE_0;
846 err = spi_setup(spi);
850 ts = kzalloc(sizeof(struct xpt2046), GFP_KERNEL);
851 packet = kzalloc(sizeof(struct xpt2046_packet), GFP_KERNEL);
852 input_dev = input_allocate_device();
853 if (!ts || !packet || !input_dev) {
858 dev_set_drvdata(&spi->dev, ts);
862 ts->input = input_dev;
863 ts->swap_xy = pdata->swap_xy;
865 INIT_DELAYED_WORK(&ts->d_work, xpt2046_dwork_handler);
867 tslib_init(&ts->tslib_info, xpt2046_get_raw_data);
869 spin_lock_init(&ts->lock);
871 ts->model = pdata->model ? : 2046;
873 if (pdata->filter != NULL) {
874 if (pdata->filter_init != NULL) {
875 err = pdata->filter_init(pdata, &ts->filter_data);
879 ts->filter = pdata->filter;
880 ts->filter_cleanup = pdata->filter_cleanup;
881 } else if (pdata->debounce_max) {
882 ts->debounce_max = pdata->debounce_max;
883 if (ts->debounce_max < pdata->debounce_rep)
884 ts->debounce_max = pdata->debounce_rep;
885 ts->debounce_tol = pdata->debounce_tol;
886 ts->debounce_rep = pdata->debounce_rep;
887 ts->filter = xpt2046_debounce;
888 ts->filter_data = ts;
890 ts->filter = xpt2046_no_filter;
892 err = setup_pendown(spi, ts);
894 goto err_cleanup_filter;
896 if (pdata->penirq_recheck_delay_usecs)
897 ts->penirq_recheck_delay_usecs =
898 pdata->penirq_recheck_delay_usecs;
900 ts->wait_for_sync = pdata->wait_for_sync ? : null_wait_for_sync;
901 ts->x_min = pdata->x_min;
902 ts->x_max = pdata->x_max;
903 ts->y_min = pdata->y_min;
904 ts->y_max = pdata->y_max;
906 ts->touch_ad_top = pdata->touch_ad_top;
907 ts->touch_ad_bottom= pdata->touch_ad_bottom;
908 ts->touch_ad_left= pdata->touch_ad_left;
909 ts->touch_ad_right= pdata->touch_ad_right;
911 ts->touch_virtualkey_length = pdata->touch_virtualkey_length;
913 snprintf(ts->phys, sizeof(ts->phys), "%s/input0", dev_name(&spi->dev));
914 snprintf(ts->name, sizeof(ts->name), "xpt%d-touchscreen", ts->model);
916 input_dev->name = ts->name;
917 input_dev->phys = ts->phys;
918 input_dev->dev.parent = &spi->dev;
920 input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
921 input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
922 input_set_abs_params(input_dev, ABS_X,
924 ts->x_max ? : MAX_12BIT,
926 input_set_abs_params(input_dev, ABS_Y,
928 ts->y_max ? : MAX_12BIT,
931 vref = pdata->keep_vref_on;
933 /* set up the transfers to read touchscreen state; this assumes we
934 * use formula #2 for pressure, not #3.
941 /* y- still on; turn on only y+ (and ADC) */
942 packet->read_y = READ_Y(vref);
943 x->tx_buf = &packet->read_y;
945 spi_message_add_tail(x, m);
948 x->rx_buf = &packet->tc.y;
950 spi_message_add_tail(x, m);
952 m->complete = xpt2046_rx_val;
958 /* turn y- off, x+ on, then leave in lowpower */
960 packet->read_x = READ_X(vref);
961 x->tx_buf = &packet->read_x;
963 spi_message_add_tail(x, m);
966 x->rx_buf = &packet->tc.x;
968 spi_message_add_tail(x, m);
970 m->complete = xpt2046_rx_val;
978 packet->pwrdown = PWRDOWN;
979 x->tx_buf = &packet->pwrdown;
981 spi_message_add_tail(x, m);
984 x->rx_buf = &packet->dummy;
987 spi_message_add_tail(x, m);
989 m->complete = xpt2046_rx;
994 if (request_irq(spi->irq, xpt2046_irq, IRQF_TRIGGER_FALLING,
995 spi->dev.driver->name, ts)) {
996 xpt2046printk("%s:trying pin change workaround on irq %d\n",__FUNCTION__,spi->irq);
997 err = request_irq(spi->irq, xpt2046_irq,
998 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
999 spi->dev.driver->name, ts);
1001 dev_dbg(&spi->dev, "irq %d busy?\n", spi->irq);
1005 xpt2046printk("***>%s:touchscreen irq %d\n",__FUNCTION__,spi->irq);
1007 /* take a first sample, leaving nPENIRQ active and vREF off; avoid
1008 * the touchscreen, in case it's not connected.
1010 xpt2046_read12_dfr(&spi->dev,READ_X(1));
1012 err = input_register_device(input_dev);
1014 goto err_remove_attr_group;
1016 #ifdef CONFIG_HAS_EARLYSUSPEND
1017 ts->early_suspend.suspend = xpt2046_early_suspend;
1018 ts->early_suspend.resume = xpt2046_late_resume;
1019 ts->early_suspend.level = EARLY_SUSPEND_LEVEL_BLANK_SCREEN + 1;
1020 register_early_suspend(&ts->early_suspend);
1023 xpt2046printk("xpt2046_ts: driver initialized\n");
1026 err_remove_attr_group:
1027 free_irq(spi->irq, ts);
1029 if (ts->gpio_pendown != -1)
1030 gpio_free(ts->gpio_pendown);
1032 if (ts->filter_cleanup)
1033 ts->filter_cleanup(ts->filter_data);
1035 input_free_device(input_dev);
1041 static int __devexit xpt2046_remove(struct spi_device *spi)
1043 struct xpt2046 *ts = dev_get_drvdata(&spi->dev);
1045 input_unregister_device(ts->input);
1047 #if !defined(CONFIG_HAS_EARLYSUSPEND)
1048 xpt2046_suspend(spi, PMSG_SUSPEND);
1049 #elif defined(CONFIG_HAS_EARLYSUSPEND)
1050 xpt2046_early_suspend(&ts->early_suspend);
1051 unregister_early_suspend(&ts->early_suspend);
1054 free_irq(ts->spi->irq, ts);
1055 /* suspend left the IRQ disabled */
1056 enable_irq(ts->spi->irq);
1058 if (ts->gpio_pendown != -1)
1059 gpio_free(ts->gpio_pendown);
1061 if (ts->filter_cleanup)
1062 ts->filter_cleanup(ts->filter_data);
1067 dev_dbg(&spi->dev, "unregistered touchscreen\n");
1071 static struct spi_driver xpt2046_driver = {
1073 .name = "xpt2046_ts",
1074 .bus = &spi_bus_type,
1075 .owner = THIS_MODULE,
1077 .probe = xpt2046_probe,
1078 .remove = __devexit_p(xpt2046_remove),
1079 #ifndef CONFIG_HAS_EARLYSUSPEND
1080 .suspend = xpt2046_suspend,
1081 .resume = xpt2046_resume,
1085 static int __init xpt2046_init(void)
1087 return spi_register_driver(&xpt2046_driver);
1089 module_init(xpt2046_init);
1091 static void __exit xpt2046_exit(void)
1093 spi_unregister_driver(&xpt2046_driver);
1095 module_exit(xpt2046_exit);
1097 MODULE_DESCRIPTION("rk29xx spi xpt2046 TouchScreen Driver");
1098 MODULE_LICENSE("GPL");
1099 MODULE_ALIAS("spi:xpt2046");