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_cbn_ts.h"
31 #include "calibration_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;
113 int touch_virtualkey_length;
115 struct hrtimer timer;
116 unsigned pendown:1; /* P: lock */
117 unsigned pending:1; /* P: lock */
118 // FIXME remove "irq_disabled"
119 unsigned irq_disabled:1; /* P: lock */
121 unsigned is_suspended:1;
123 int (*filter)(void *data, int data_idx, int *val);
125 void (*filter_cleanup)(void *data);
126 int (*get_pendown_state)(void);
129 void (*wait_for_sync)(void);
130 #ifdef CONFIG_HAS_EARLYSUSPEND
131 struct early_suspend early_suspend;
135 /* leave chip selected when we're done, for quicker re-select? */
137 #define CS_CHANGE(xfer) ((xfer).cs_change = 1)
139 #define CS_CHANGE(xfer) ((xfer).cs_change = 0)
142 /*--------------------------------------------------------------------------*/
144 /* The xpt2046 has touchscreen and other sensors.
145 * Earlier xpt2046 chips are somewhat compatible.
147 #define XPT2046_START (1 << 7)
148 #define XPT2046_A2A1A0_d_y (1 << 4) /* differential */
149 #define XPT2046_A2A1A0_d_z1 (3 << 4) /* differential */
150 #define XPT2046_A2A1A0_d_z2 (4 << 4) /* differential */
151 #define XPT2046_A2A1A0_d_x (5 << 4) /* differential */
152 #define XPT2046_A2A1A0_temp0 (0 << 4) /* non-differential */
153 #define XPT2046_A2A1A0_vbatt (2 << 4) /* non-differential */
154 #define XPT2046_A2A1A0_vaux (6 << 4) /* non-differential */
155 #define XPT2046_A2A1A0_temp1 (7 << 4) /* non-differential */
156 #define XPT2046_8_BIT (1 << 3)
157 #define XPT2046_12_BIT (0 << 3)
158 #define XPT2046_SER (1 << 2) /* non-differential */
159 #define XPT2046_DFR (0 << 2) /* differential */
160 #define XPT2046_PD10_PDOWN (0 << 0) /* lowpower mode + penirq */
161 #define XPT2046_PD10_ADC_ON (1 << 0) /* ADC on */
162 #define XPT2046_PD10_REF_ON (2 << 0) /* vREF on + penirq */
163 #define XPT2046_PD10_ALL_ON (3 << 0) /* ADC + vREF on */
165 #define MAX_12BIT ((1<<12)-1)
167 /* leave ADC powered up (disables penirq) between differential samples */
168 #define READ_12BIT_DFR(x, adc, vref) (XPT2046_START | XPT2046_A2A1A0_d_ ## x \
169 | XPT2046_12_BIT | XPT2046_DFR | \
170 (adc ? XPT2046_PD10_ADC_ON : 0) | (vref ? XPT2046_PD10_REF_ON : 0))
172 #define READ_Y(vref) (READ_12BIT_DFR(y, 1, vref))
173 #define READ_Z1(vref) (READ_12BIT_DFR(z1, 1, vref))
174 #define READ_Z2(vref) (READ_12BIT_DFR(z2, 1, vref))
176 #define READ_X(vref) (READ_12BIT_DFR(x, 1, vref))
177 #define PWRDOWN (READ_12BIT_DFR(y, 0, 0)) /* LAST */
179 /* single-ended samples need to first power up reference voltage;
180 * we leave both ADC and VREF powered
182 #define READ_12BIT_SER(x) (XPT2046_START | XPT2046_A2A1A0_ ## x \
183 | XPT2046_12_BIT | XPT2046_SER)
185 #define REF_ON (READ_12BIT_DFR(x, 1, 1))
186 #define REF_OFF (READ_12BIT_DFR(y, 0, 0))
188 /*--------------------------------------------------------------------------*/
190 * touchscreen sensors use differential conversions.
196 u16 dummy; /* for the pwrdown read */
198 struct spi_message msg;
199 struct spi_transfer xfer[4];
202 volatile struct adc_point gADPoint;
204 static void xpt2046_enable(struct xpt2046 *ts);
205 static void xpt2046_disable(struct xpt2046 *ts);
206 static int xpt2046_verifyAndConvert(struct xpt2046 *ts,int adx, int ady,int *x, int *y)
208 xpt2046printk("%s:(%d/%d)\n",__FUNCTION__,*x, *y);
210 if((*x< ts->x_min) || (*x > ts->x_max))
213 if((*y< ts->y_min) || (*y > ts->y_max + ts->touch_virtualkey_length))
219 static int device_suspended(struct device *dev)
221 struct xpt2046 *ts = dev_get_drvdata(dev);
222 return ts->is_suspended || ts->disabled;
225 static int xpt2046_read12_dfr(struct device *dev, unsigned command)
227 struct spi_device *spi = to_spi_device(dev);
228 struct xpt2046 *ts = dev_get_drvdata(dev);
229 struct dfr_req *req = kzalloc(sizeof *req, GFP_KERNEL);
235 spi_message_init(&req->msg);
238 req->command = (u8) command;
239 req->xfer[0].tx_buf = &req->command;
240 req->xfer[0].len = 1;
241 spi_message_add_tail(&req->xfer[0], &req->msg);
243 req->xfer[1].rx_buf = &req->sample;
244 req->xfer[1].len = 2;
245 spi_message_add_tail(&req->xfer[1], &req->msg);
247 /* converter in low power mode & enable PENIRQ */
248 req->pwrdown= PWRDOWN;
249 req->xfer[2].tx_buf = &req->pwrdown;
250 req->xfer[2].len = 1;
251 spi_message_add_tail(&req->xfer[2], &req->msg);
253 req->xfer[3].rx_buf = &req->dummy;
254 req->xfer[3].len = 2;
255 CS_CHANGE(req->xfer[3]);
256 spi_message_add_tail(&req->xfer[3], &req->msg);
258 ts->irq_disabled = 1;
259 disable_irq(spi->irq);
260 status = spi_sync(spi, &req->msg);
261 ts->irq_disabled = 0;
262 enable_irq(spi->irq);
265 /* on-wire is a must-ignore bit, a BE12 value, then padding */
266 status = be16_to_cpu(req->sample);
267 status = status >> 3;
269 xpt2046printk("***>%s:status=%d\n",__FUNCTION__,status);
278 /*--------------------------------------------------------------------------*/
280 static int get_pendown_state(struct xpt2046 *ts)
282 if (ts->get_pendown_state)
283 return ts->get_pendown_state();
285 return !gpio_get_value(ts->gpio_pendown);
288 static void null_wait_for_sync(void)
294 * PENIRQ only kicks the timer. The timer only reissues the SPI transfer,
295 * to retrieve touchscreen status.
297 * The SPI transfer completion callback does the real work. It reports
298 * touchscreen events and reactivates the timer (or IRQ) as appropriate.
300 static void xpt2046_rx(void *xpt)
302 struct xpt2046 *ts = xpt;
303 struct xpt2046_packet *packet = ts->packet;
307 /* xpt2046_rx_val() did in-place conversion (including byteswap) from
308 * on-the-wire format as part of debouncing to get stable readings.
313 xpt2046printk("***>%s:x=%d,y=%d\n",__FUNCTION__,x,y);
315 /* range filtering */
319 /* Sample found inconsistent by debouncing or pressure is beyond
320 * the maximum. Don't report it to user space, repeat at least
321 * once more the measurement
323 if (packet->tc.ignore) {
325 xpt2046printk("***>%s:ignored=%d\n",__FUNCTION__,packet->tc.ignore);
327 hrtimer_start(&ts->timer, ktime_set(0, TS_POLL_PERIOD),
332 /* Maybe check the pendown state before reporting. This discards
333 * false readings when the pen is lifted.
335 if (ts->penirq_recheck_delay_usecs) {
336 udelay(ts->penirq_recheck_delay_usecs);
337 if (!get_pendown_state(ts))
339 xpt2046printk("***>%s:get_pendown_state(ts)==0,discard false reading\n",__FUNCTION__);
344 /* NOTE: We can't rely on the pressure to determine the pen down
345 * state, even this controller has a pressure sensor. The pressure
346 * value can fluctuate for quite a while after lifting the pen and
347 * in some cases may not even settle at the expected value.
349 * The only safe way to check for the pen up condition is in the
350 * timer by reading the pen signal state (it's a GPIO _and_ IRQ).
353 struct input_dev *input = ts->input;
355 TouchPanelCalibrateAPoint(x, y, &cal_x, &cal_y);
365 if(xpt2046_verifyAndConvert(ts,cal_x,cal_y,&cal_x,&cal_y))
367 xpt2046printk("***>%s:xpt2046_verifyAndConvert fail\n",__FUNCTION__);
372 input_report_key(input, BTN_TOUCH, 1);
374 xpt2046printk("***>%s:input_report_key(pen down)\n",__FUNCTION__);
377 input_report_abs(input, ABS_X, cal_x);
378 input_report_abs(input, ABS_Y, cal_y);
381 xpt2046printk("***>%s:input_report_abs(%4d/%4d)\n",__FUNCTION__,cal_x, cal_y);
384 hrtimer_start(&ts->timer, ktime_set(0, TS_POLL_PERIOD),
388 static int xpt2046_debounce(void *xpt, int data_idx, int *val)
390 struct xpt2046 *ts = xpt;
391 static int average_val[2];
394 xpt2046printk("***>%s:%d,%d,%d,%d,%d,%d,%d,%d\n",__FUNCTION__,
395 data_idx,ts->last_read,
396 ts->read_cnt,ts->debounce_max,
397 abs(ts->last_read - *val),ts->debounce_tol,
398 ts->read_rep,ts->debounce_rep);
400 /* discard the first sample. */
401 //on info_it50, the top-left area(1cmx1cm top-left square ) is not responding cause the first sample is invalid, @sep 17th
406 return XPT2046_FILTER_REPEAT;
408 if(*val == 4095 || *val == 0)
412 memset(average_val,0,sizeof(average_val));
413 xpt2046printk("***>%s:*val == 4095 || *val == 0\n",__FUNCTION__);
414 return XPT2046_FILTER_IGNORE;
418 if (ts->read_cnt==1 || (abs(ts->last_read - *val) > ts->debounce_tol)) {
419 /* Start over collecting consistent readings. */
421 average_val[data_idx] = *val;
422 /* Repeat it, if this was the first read or the read
423 * wasn't consistent enough. */
424 if (ts->read_cnt < ts->debounce_max) {
425 ts->last_read = *val;
427 return XPT2046_FILTER_REPEAT;
429 /* Maximum number of debouncing reached and still
430 * not enough number of consistent readings. Abort
431 * the whole sample, repeat it in the next sampling
436 memset(average_val,0,sizeof(average_val));
437 xpt2046printk("***>%s:XPT2046_FILTER_IGNORE\n",__FUNCTION__);
438 return XPT2046_FILTER_IGNORE;
442 average_val[data_idx] += *val;
444 if (++ts->read_rep >= ts->debounce_rep) {
445 /* Got a good reading for this coordinate,
446 * go for the next one. */
450 *val = average_val[data_idx]/(ts->debounce_rep);
451 return XPT2046_FILTER_OK;
453 /* Read more values that are consistent. */
456 return XPT2046_FILTER_REPEAT;
461 static int xpt2046_no_filter(void *xpt, int data_idx, int *val)
463 return XPT2046_FILTER_OK;
466 static void xpt2046_rx_val(void *xpt)
468 struct xpt2046 *ts = xpt;
469 struct xpt2046_packet *packet = ts->packet;
470 struct spi_message *m;
471 struct spi_transfer *t;
476 m = &ts->msg[ts->msg_idx];
477 t = list_entry(m->transfers.prev, struct spi_transfer, transfer_list);
479 /* adjust: on-wire is a must-ignore bit, a BE12 value, then padding;
480 * built from two 8 bit values written msb-first.
482 val = (be16_to_cpup((__be16 *)t->rx_buf) >> 3) & 0x0fff;
484 xpt2046printk("***>%s:value=%d\n",__FUNCTION__,val);
486 action = ts->filter(ts->filter_data, ts->msg_idx, &val);
488 case XPT2046_FILTER_REPEAT:
490 case XPT2046_FILTER_IGNORE:
491 packet->tc.ignore = 1;
492 /* Last message will contain xpt2046_rx() as the
493 * completion function.
497 case XPT2046_FILTER_OK:
498 *(u16 *)t->rx_buf = val;
499 packet->tc.ignore = 0;
500 m = &ts->msg[++ts->msg_idx];
506 status = spi_async(ts->spi, m);
508 dev_err(&ts->spi->dev, "spi_async --> %d\n",
512 static enum hrtimer_restart xpt2046_timer(struct hrtimer *handle)
514 struct xpt2046 *ts = container_of(handle, struct xpt2046, timer);
517 spin_lock(&ts->lock);
519 if (unlikely(!get_pendown_state(ts) ||
520 device_suspended(&ts->spi->dev))) {
522 struct input_dev *input = ts->input;
523 input_report_key(input, BTN_TOUCH, 0);
528 xpt2046printk("***>%s:input_report_key(The touchscreen up)\n",__FUNCTION__);
531 /* measurement cycle ended */
532 if (!device_suspended(&ts->spi->dev)) {
533 xpt2046printk("***>%s:device_suspended==0\n",__FUNCTION__);
534 ts->irq_disabled = 0;
535 enable_irq(ts->spi->irq);
539 /* pen is still down, continue with the measurement */
540 xpt2046printk("***>%s:pen is still down, continue with the measurement\n",__FUNCTION__);
543 status = spi_async(ts->spi, &ts->msg[0]);
545 dev_err(&ts->spi->dev, "spi_async --> %d\n", status);
548 spin_unlock(&ts->lock);
549 return HRTIMER_NORESTART;
552 static irqreturn_t xpt2046_irq(int irq, void *handle)
554 struct xpt2046 *ts = handle;
557 xpt2046printk("***>%s.....%s.....%d\n",__FILE__,__FUNCTION__,__LINE__);
559 spin_lock_irqsave(&ts->lock, flags);
561 if (likely(get_pendown_state(ts))) {
562 if (!ts->irq_disabled) {
563 /* The ARM do_simple_IRQ() dispatcher doesn't act
564 * like the other dispatchers: it will report IRQs
565 * even after they've been disabled. We work around
566 * that here. (The "generic irq" framework may help...)
568 ts->irq_disabled = 1;
569 disable_irq_nosync(ts->spi->irq);
571 hrtimer_start(&ts->timer, ktime_set(0, TS_POLL_DELAY),
575 spin_unlock_irqrestore(&ts->lock, flags);
580 /*--------------------------------------------------------------------------*/
582 /* Must be called with ts->lock held */
583 static void xpt2046_disable(struct xpt2046 *ts)
590 /* are we waiting for IRQ, or polling? */
592 ts->irq_disabled = 1;
593 disable_irq(ts->spi->irq);
595 /* the timer will run at least once more, and
596 * leave everything in a clean state, IRQ disabled
598 while (ts->pending) {
599 spin_unlock_irq(&ts->lock);
601 spin_lock_irq(&ts->lock);
605 /* we know the chip's in lowpower mode since we always
606 * leave it that way after every request
610 /* Must be called with ts->lock held */
611 static void xpt2046_enable(struct xpt2046 *ts)
617 ts->irq_disabled = 0;
618 enable_irq(ts->spi->irq);
621 static int xpt2046_pSuspend(struct xpt2046 *ts)
623 spin_lock_irq(&ts->lock);
625 ts->is_suspended = 1;
628 spin_unlock_irq(&ts->lock);
633 static int xpt2046_pResume(struct xpt2046 *ts)
635 spin_lock_irq(&ts->lock);
637 ts->is_suspended = 0;
640 spin_unlock_irq(&ts->lock);
645 #if !defined(CONFIG_HAS_EARLYSUSPEND)
646 static int xpt2046_suspend(struct spi_device *spi, pm_message_t message)
648 struct xpt2046 *ts = dev_get_drvdata(&spi->dev);
650 printk("xpt2046_suspend\n");
652 xpt2046_pSuspend(ts);
657 static int xpt2046_resume(struct spi_device *spi)
659 struct xpt2046 *ts = dev_get_drvdata(&spi->dev);
661 printk("xpt2046_resume\n");
668 #elif defined(CONFIG_HAS_EARLYSUSPEND)
669 static void xpt2046_early_suspend(struct early_suspend *h)
672 ts = container_of(h, struct xpt2046, early_suspend);
674 printk("xpt2046_suspend early\n");
676 xpt2046_pSuspend(ts);
681 static void xpt2046_late_resume(struct early_suspend *h)
684 ts = container_of(h, struct xpt2046, early_suspend);
686 printk("xpt2046_resume late\n");
694 static int __devinit setup_pendown(struct spi_device *spi, struct xpt2046 *ts)
696 struct xpt2046_platform_data *pdata = spi->dev.platform_data;
699 /* REVISIT when the irq can be triggered active-low, or if for some
700 * reason the touchscreen isn't hooked up, we don't need to access
703 if (!pdata->get_pendown_state && !gpio_is_valid(pdata->gpio_pendown)) {
704 dev_err(&spi->dev, "no get_pendown_state nor gpio_pendown?\n");
708 if (pdata->get_pendown_state) {
709 ts->get_pendown_state = pdata->get_pendown_state;
713 if (pdata->io_init) {
714 err = pdata->io_init();
716 dev_err(&spi->dev, "xpt2046 io_init fail\n");
719 ts->gpio_pendown = pdata->gpio_pendown;
720 strcpy(ts->pendown_iomux_name,pdata->pendown_iomux_name);
721 ts->pendown_iomux_mode = pdata->pendown_iomux_mode;
723 rk29_mux_api_set(ts->pendown_iomux_name,pdata->pendown_iomux_mode);
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_pull_updown(pdata->gpio_pendown, GPIOPullUp);
733 dev_err(&spi->dev, "failed to pullup pendown GPIO%d\n",
734 pdata->gpio_pendown);
737 ts->gpio_pendown = pdata->gpio_pendown;
741 static int __devinit xpt2046_probe(struct spi_device *spi)
744 struct xpt2046_packet *packet;
745 struct input_dev *input_dev;
746 struct xpt2046_platform_data *pdata = spi->dev.platform_data;
747 struct spi_message *m;
748 struct spi_transfer *x;
753 dev_dbg(&spi->dev, "no IRQ?\n");
757 spi->irq = gpio_to_irq(spi->irq);
758 dev_dbg(&spi->dev, "no IRQ?\n");
762 dev_err(&spi->dev, "empty platform_data\n");
766 /* don't exceed max specified sample rate */
767 if (spi->max_speed_hz > (125000 * SAMPLE_BITS)) {
768 dev_dbg(&spi->dev, "f(sample) %d KHz?\n",
769 (spi->max_speed_hz/SAMPLE_BITS)/1000);
773 /* We'd set TX wordsize 8 bits and RX wordsize to 13 bits ... except
774 * that even if the hardware can do that, the SPI controller driver
775 * may not. So we stick to very-portable 8 bit words, both RX and TX.
777 spi->bits_per_word = 8;
778 spi->mode = SPI_MODE_0;
779 err = spi_setup(spi);
783 ts = kzalloc(sizeof(struct xpt2046), GFP_KERNEL);
784 packet = kzalloc(sizeof(struct xpt2046_packet), GFP_KERNEL);
785 input_dev = input_allocate_device();
786 if (!ts || !packet || !input_dev) {
791 dev_set_drvdata(&spi->dev, ts);
795 ts->input = input_dev;
796 ts->swap_xy = pdata->swap_xy;
798 hrtimer_init(&ts->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
799 ts->timer.function = xpt2046_timer;
801 spin_lock_init(&ts->lock);
803 ts->model = pdata->model ? : 2046;
805 if (pdata->filter != NULL) {
806 if (pdata->filter_init != NULL) {
807 err = pdata->filter_init(pdata, &ts->filter_data);
811 ts->filter = pdata->filter;
812 ts->filter_cleanup = pdata->filter_cleanup;
813 } else if (pdata->debounce_max) {
814 ts->debounce_max = pdata->debounce_max;
815 if (ts->debounce_max < pdata->debounce_rep)
816 ts->debounce_max = pdata->debounce_rep;
817 ts->debounce_tol = pdata->debounce_tol;
818 ts->debounce_rep = pdata->debounce_rep;
819 ts->filter = xpt2046_debounce;
820 ts->filter_data = ts;
822 ts->filter = xpt2046_no_filter;
824 err = setup_pendown(spi, ts);
826 goto err_cleanup_filter;
828 if (pdata->penirq_recheck_delay_usecs)
829 ts->penirq_recheck_delay_usecs =
830 pdata->penirq_recheck_delay_usecs;
832 ts->wait_for_sync = pdata->wait_for_sync ? : null_wait_for_sync;
833 ts->x_min = pdata->x_min;
834 ts->x_max = pdata->x_max;
835 ts->y_min = pdata->y_min;
836 ts->y_max = pdata->y_max;
839 ts->touch_virtualkey_length = pdata->touch_virtualkey_length;
841 snprintf(ts->phys, sizeof(ts->phys), "%s/input0", dev_name(&spi->dev));
842 snprintf(ts->name, sizeof(ts->name), "xpt%d-touchscreen", ts->model);
844 input_dev->name = ts->name;
845 input_dev->phys = ts->phys;
846 input_dev->dev.parent = &spi->dev;
848 input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
849 input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
850 input_set_abs_params(input_dev, ABS_X,
852 ts->x_max ? : MAX_12BIT,
854 input_set_abs_params(input_dev, ABS_Y,
856 ts->y_max ? : MAX_12BIT,
859 vref = pdata->keep_vref_on;
861 tp_calib_iface_init(pdata->screen_x,pdata->screen_y,pdata->uncali_x_default,pdata->uncali_y_default);
862 /* set up the transfers to read touchscreen state; this assumes we
863 * use formula #2 for pressure, not #3.
870 /* y- still on; turn on only y+ (and ADC) */
871 packet->read_y = READ_Y(vref);
872 x->tx_buf = &packet->read_y;
874 spi_message_add_tail(x, m);
877 x->rx_buf = &packet->tc.y;
879 spi_message_add_tail(x, m);
881 m->complete = xpt2046_rx_val;
887 /* turn y- off, x+ on, then leave in lowpower */
889 packet->read_x = READ_X(vref);
890 x->tx_buf = &packet->read_x;
892 spi_message_add_tail(x, m);
895 x->rx_buf = &packet->tc.x;
897 spi_message_add_tail(x, m);
899 m->complete = xpt2046_rx_val;
907 packet->pwrdown = PWRDOWN;
908 x->tx_buf = &packet->pwrdown;
910 spi_message_add_tail(x, m);
913 x->rx_buf = &packet->dummy;
916 spi_message_add_tail(x, m);
918 m->complete = xpt2046_rx;
923 if (request_irq(spi->irq, xpt2046_irq, IRQF_TRIGGER_FALLING,
924 spi->dev.driver->name, ts)) {
925 xpt2046printk("%s:trying pin change workaround on irq %d\n",__FUNCTION__,spi->irq);
926 err = request_irq(spi->irq, xpt2046_irq,
927 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
928 spi->dev.driver->name, ts);
930 dev_dbg(&spi->dev, "irq %d busy?\n", spi->irq);
934 xpt2046printk("***>%s:touchscreen irq %d\n",__FUNCTION__,spi->irq);
936 /* take a first sample, leaving nPENIRQ active and vREF off; avoid
937 * the touchscreen, in case it's not connected.
939 xpt2046_read12_dfr(&spi->dev,READ_X(1));
941 err = input_register_device(input_dev);
943 goto err_remove_attr_group;
945 #ifdef CONFIG_HAS_EARLYSUSPEND
946 ts->early_suspend.suspend = xpt2046_early_suspend;
947 ts->early_suspend.resume = xpt2046_late_resume;
948 ts->early_suspend.level = EARLY_SUSPEND_LEVEL_BLANK_SCREEN + 1;
949 register_early_suspend(&ts->early_suspend);
952 xpt2046printk("xpt2046_ts: driver initialized\n");
955 err_remove_attr_group:
956 free_irq(spi->irq, ts);
958 if (ts->gpio_pendown != -1)
959 gpio_free(ts->gpio_pendown);
961 if (ts->filter_cleanup)
962 ts->filter_cleanup(ts->filter_data);
964 input_free_device(input_dev);
971 static int __devexit xpt2046_remove(struct spi_device *spi)
973 struct xpt2046 *ts = dev_get_drvdata(&spi->dev);
975 input_unregister_device(ts->input);
977 #if !defined(CONFIG_HAS_EARLYSUSPEND)
978 xpt2046_suspend(spi, PMSG_SUSPEND);
979 #elif defined(CONFIG_HAS_EARLYSUSPEND)
980 xpt2046_early_suspend(&ts->early_suspend);
981 unregister_early_suspend(&ts->early_suspend);
984 free_irq(ts->spi->irq, ts);
985 /* suspend left the IRQ disabled */
986 enable_irq(ts->spi->irq);
988 if (ts->gpio_pendown != -1)
989 gpio_free(ts->gpio_pendown);
991 if (ts->filter_cleanup)
992 ts->filter_cleanup(ts->filter_data);
997 tp_calib_iface_exit();
999 dev_dbg(&spi->dev, "unregistered touchscreen\n");
1003 static struct spi_driver xpt2046_driver = {
1005 .name = "xpt2046_ts",
1006 .bus = &spi_bus_type,
1007 .owner = THIS_MODULE,
1009 .probe = xpt2046_probe,
1010 .remove = __devexit_p(xpt2046_remove),
1011 #ifndef CONFIG_HAS_EARLYSUSPEND
1012 .suspend = xpt2046_suspend,
1013 .resume = xpt2046_resume,
1017 static int __init xpt2046_init(void)
1023 xpt2046printk("Touch panel drive XPT2046 driver init...\n");
1024 ret = spi_register_driver(&xpt2046_driver);
1027 printk("Register XPT2046 driver failed.\n");
1036 static void __exit xpt2046_exit(void)
1038 xpt2046printk("Touch panel drive XPT2046 driver exit...\n");
1039 spi_unregister_driver(&xpt2046_driver);
1041 module_init(xpt2046_init);
1042 module_exit(xpt2046_exit);
1044 MODULE_DESCRIPTION("rk29xx spi xpt2046 TouchScreen Driver");
1045 MODULE_LICENSE("GPL");
1046 MODULE_ALIAS("spi:xpt2046");