2 * ADS7846 based touchscreen and sensor driver
4 * Copyright (c) 2005 David Brownell
5 * Copyright (c) 2006 Nokia Corporation
6 * Various changes: Imre Deak <imre.deak@nokia.com>
10 * Copyright (C) 2004-2005 Richard Purdie
11 * - omap_ts.[hc], ads7846.h, ts_osk.c
12 * Copyright (C) 2002 MontaVista Software
13 * Copyright (C) 2004 Texas Instruments
14 * Copyright (C) 2005 Dirk Behme
16 * This program is free software; you can redistribute it and/or modify
17 * it under the terms of the GNU General Public License version 2 as
18 * published by the Free Software Foundation.
20 #include <linux/device.h>
21 #include <linux/init.h>
22 #include <linux/delay.h>
23 #include <linux/input.h>
24 #include <linux/interrupt.h>
25 #include <linux/slab.h>
26 #include <linux/spi/spi.h>
27 #include <linux/spi/ads7846.h>
31 #include <asm/mach-types.h>
32 #ifdef CONFIG_ARCH_OMAP
33 #include <asm/arch/gpio.h>
39 * This code has been heavily tested on a Nokia 770, and lightly
40 * tested on other ads7846 devices (OSK/Mistral, Lubbock).
41 * Support for ads7843 and ads7845 has only been stubbed in.
43 * IRQ handling needs a workaround because of a shortcoming in handling
44 * edge triggered IRQs on some platforms like the OMAP1/2. These
45 * platforms don't handle the ARM lazy IRQ disabling properly, thus we
46 * have to maintain our own SW IRQ disabled status. This should be
47 * removed as soon as the affected platform's IRQ handling is fixed.
49 * app note sbaa036 talks in more detail about accurate sampling...
50 * that ought to help in situations like LCDs inducing noise (which
51 * can also be helped by using synch signals) and more generally.
52 * This driver tries to utilize the measures described in the app
53 * note. The strength of filtering can be set in the board-* specific
57 #define TS_POLL_PERIOD msecs_to_jiffies(10)
59 /* this driver doesn't aim at the peak continuous sample rate */
60 #define SAMPLE_BITS (8 /*cmd*/ + 16 /*sample*/ + 2 /* before, after */)
63 /* For portability, we can't read 12 bit values using SPI (which
64 * would make the controller deliver them as native byteorder u16
65 * with msbs zeroed). Instead, we read them as two 8-bit values,
66 * which need byteswapping then range adjustment.
75 struct input_dev
*input
;
78 struct spi_device
*spi
;
84 u8 read_x
, read_y
, read_z1
, read_z2
, pwrdown
;
85 u16 dummy
; /* for the pwrdown read */
88 struct spi_transfer xfer
[10];
89 struct spi_message msg
[5];
90 struct spi_message
*last_msg
;
101 struct timer_list timer
; /* P: lock */
102 unsigned pendown
:1; /* P: lock */
103 unsigned pending
:1; /* P: lock */
104 // FIXME remove "irq_disabled"
105 unsigned irq_disabled
:1; /* P: lock */
108 int (*get_pendown_state
)(void);
111 /* leave chip selected when we're done, for quicker re-select? */
113 #define CS_CHANGE(xfer) ((xfer).cs_change = 1)
115 #define CS_CHANGE(xfer) ((xfer).cs_change = 0)
118 /*--------------------------------------------------------------------------*/
120 /* The ADS7846 has touchscreen and other sensors.
121 * Earlier ads784x chips are somewhat compatible.
123 #define ADS_START (1 << 7)
124 #define ADS_A2A1A0_d_y (1 << 4) /* differential */
125 #define ADS_A2A1A0_d_z1 (3 << 4) /* differential */
126 #define ADS_A2A1A0_d_z2 (4 << 4) /* differential */
127 #define ADS_A2A1A0_d_x (5 << 4) /* differential */
128 #define ADS_A2A1A0_temp0 (0 << 4) /* non-differential */
129 #define ADS_A2A1A0_vbatt (2 << 4) /* non-differential */
130 #define ADS_A2A1A0_vaux (6 << 4) /* non-differential */
131 #define ADS_A2A1A0_temp1 (7 << 4) /* non-differential */
132 #define ADS_8_BIT (1 << 3)
133 #define ADS_12_BIT (0 << 3)
134 #define ADS_SER (1 << 2) /* non-differential */
135 #define ADS_DFR (0 << 2) /* differential */
136 #define ADS_PD10_PDOWN (0 << 0) /* lowpower mode + penirq */
137 #define ADS_PD10_ADC_ON (1 << 0) /* ADC on */
138 #define ADS_PD10_REF_ON (2 << 0) /* vREF on + penirq */
139 #define ADS_PD10_ALL_ON (3 << 0) /* ADC + vREF on */
141 #define MAX_12BIT ((1<<12)-1)
143 /* leave ADC powered up (disables penirq) between differential samples */
144 #define READ_12BIT_DFR(x) (ADS_START | ADS_A2A1A0_d_ ## x \
145 | ADS_12_BIT | ADS_DFR)
147 #define READ_Y (READ_12BIT_DFR(y) | ADS_PD10_ADC_ON)
148 #define READ_Z1 (READ_12BIT_DFR(z1) | ADS_PD10_ADC_ON)
149 #define READ_Z2 (READ_12BIT_DFR(z2) | ADS_PD10_ADC_ON)
151 #define READ_X (READ_12BIT_DFR(x) | ADS_PD10_ADC_ON)
152 #define PWRDOWN (READ_12BIT_DFR(y) | ADS_PD10_PDOWN) /* LAST */
154 /* single-ended samples need to first power up reference voltage;
155 * we leave both ADC and VREF powered
157 #define READ_12BIT_SER(x) (ADS_START | ADS_A2A1A0_ ## x \
158 | ADS_12_BIT | ADS_SER)
160 #define REF_ON (READ_12BIT_DFR(x) | ADS_PD10_ALL_ON)
161 #define REF_OFF (READ_12BIT_DFR(y) | ADS_PD10_PDOWN)
163 /*--------------------------------------------------------------------------*/
166 * Non-touchscreen sensors only use single-ended conversions.
175 struct spi_message msg
;
176 struct spi_transfer xfer
[6];
179 static void ads7846_enable(struct ads7846
*ts
);
180 static void ads7846_disable(struct ads7846
*ts
);
182 static int device_suspended(struct device
*dev
)
184 struct ads7846
*ts
= dev_get_drvdata(dev
);
185 return dev
->power
.power_state
.event
!= PM_EVENT_ON
|| ts
->disabled
;
188 static int ads7846_read12_ser(struct device
*dev
, unsigned command
)
190 struct spi_device
*spi
= to_spi_device(dev
);
191 struct ads7846
*ts
= dev_get_drvdata(dev
);
192 struct ser_req
*req
= kzalloc(sizeof *req
, SLAB_KERNEL
);
200 spi_message_init(&req
->msg
);
202 /* activate reference, so it has time to settle; */
203 req
->ref_on
= REF_ON
;
204 req
->xfer
[0].tx_buf
= &req
->ref_on
;
205 req
->xfer
[0].len
= 1;
206 req
->xfer
[1].rx_buf
= &req
->scratch
;
207 req
->xfer
[1].len
= 2;
210 * for external VREF, 0 usec (and assume it's always on);
211 * for 1uF, use 800 usec;
214 req
->xfer
[1].delay_usecs
= ts
->vref_delay_usecs
;
217 req
->command
= (u8
) command
;
218 req
->xfer
[2].tx_buf
= &req
->command
;
219 req
->xfer
[2].len
= 1;
220 req
->xfer
[3].rx_buf
= &req
->sample
;
221 req
->xfer
[3].len
= 2;
223 /* REVISIT: take a few more samples, and compare ... */
225 /* turn off reference */
226 req
->ref_off
= REF_OFF
;
227 req
->xfer
[4].tx_buf
= &req
->ref_off
;
228 req
->xfer
[4].len
= 1;
229 req
->xfer
[5].rx_buf
= &req
->scratch
;
230 req
->xfer
[5].len
= 2;
232 CS_CHANGE(req
->xfer
[5]);
234 /* group all the transfers together, so we can't interfere with
235 * reading touchscreen state; disable penirq while sampling
237 for (i
= 0; i
< 6; i
++)
238 spi_message_add_tail(&req
->xfer
[i
], &req
->msg
);
240 ts
->irq_disabled
= 1;
241 disable_irq(spi
->irq
);
242 status
= spi_sync(spi
, &req
->msg
);
243 ts
->irq_disabled
= 0;
244 enable_irq(spi
->irq
);
247 status
= req
->msg
.status
;
249 /* on-wire is a must-ignore bit, a BE12 value, then padding */
250 sample
= be16_to_cpu(req
->sample
);
251 sample
= sample
>> 3;
255 return status
? status
: sample
;
258 #define SHOW(name) static ssize_t \
259 name ## _show(struct device *dev, struct device_attribute *attr, char *buf) \
261 ssize_t v = ads7846_read12_ser(dev, \
262 READ_12BIT_SER(name) | ADS_PD10_ALL_ON); \
265 return sprintf(buf, "%u\n", (unsigned) v); \
267 static DEVICE_ATTR(name, S_IRUGO, name ## _show, NULL);
274 static int is_pen_down(struct device
*dev
)
276 struct ads7846
*ts
= dev_get_drvdata(dev
);
281 static ssize_t
ads7846_pen_down_show(struct device
*dev
,
282 struct device_attribute
*attr
, char *buf
)
284 return sprintf(buf
, "%u\n", is_pen_down(dev
));
287 static DEVICE_ATTR(pen_down
, S_IRUGO
, ads7846_pen_down_show
, NULL
);
289 static ssize_t
ads7846_disable_show(struct device
*dev
,
290 struct device_attribute
*attr
, char *buf
)
292 struct ads7846
*ts
= dev_get_drvdata(dev
);
294 return sprintf(buf
, "%u\n", ts
->disabled
);
297 static ssize_t
ads7846_disable_store(struct device
*dev
,
298 struct device_attribute
*attr
,
299 const char *buf
, size_t count
)
301 struct ads7846
*ts
= dev_get_drvdata(dev
);
305 i
= simple_strtoul(buf
, &endp
, 10);
306 spin_lock_irq(&ts
->lock
);
313 spin_unlock_irq(&ts
->lock
);
318 static DEVICE_ATTR(disable
, 0664, ads7846_disable_show
, ads7846_disable_store
);
320 /*--------------------------------------------------------------------------*/
323 * PENIRQ only kicks the timer. The timer only reissues the SPI transfer,
324 * to retrieve touchscreen status.
326 * The SPI transfer completion callback does the real work. It reports
327 * touchscreen events and reactivates the timer (or IRQ) as appropriate.
330 static void ads7846_rx(void *ads
)
332 struct ads7846
*ts
= ads
;
333 struct input_dev
*input_dev
= ts
->input
;
339 /* adjust: on-wire is a must-ignore bit, a BE12 value, then padding;
340 * built from two 8 bit values written msb-first.
342 x
= (be16_to_cpu(ts
->tc
.x
) >> 3) & 0x0fff;
343 y
= (be16_to_cpu(ts
->tc
.y
) >> 3) & 0x0fff;
344 z1
= (be16_to_cpu(ts
->tc
.z1
) >> 3) & 0x0fff;
345 z2
= (be16_to_cpu(ts
->tc
.z2
) >> 3) & 0x0fff;
347 /* range filtering */
351 if (likely(x
&& z1
&& !device_suspended(&ts
->spi
->dev
))) {
352 /* compute touch pressure resistance using equation #2 */
356 Rt
*= ts
->x_plate_ohms
;
358 Rt
= (Rt
+ 2047) >> 12;
362 /* Sample found inconsistent by debouncing or pressure is beyond
363 * the maximum. Don't report it to user space, repeat at least
364 * once more the measurement */
365 if (ts
->tc
.ignore
|| Rt
> ts
->pressure_max
) {
366 mod_timer(&ts
->timer
, jiffies
+ TS_POLL_PERIOD
);
370 /* NOTE: "pendown" is inferred from pressure; we don't rely on
371 * being able to check nPENIRQ status, or "friendly" trigger modes
372 * (both-edges is much better than just-falling or low-level).
374 * REVISIT: some boards may require reading nPENIRQ; it's
375 * needed on 7843. and 7845 reads pressure differently...
377 * REVISIT: the touchscreen might not be connected; this code
378 * won't notice that, even if nPENIRQ never fires ...
380 if (!ts
->pendown
&& Rt
!= 0) {
381 input_report_key(input_dev
, BTN_TOUCH
, 1);
383 } else if (ts
->pendown
&& Rt
== 0) {
384 input_report_key(input_dev
, BTN_TOUCH
, 0);
389 input_report_abs(input_dev
, ABS_X
, x
);
390 input_report_abs(input_dev
, ABS_Y
, y
);
395 input_report_abs(input_dev
, ABS_PRESSURE
, Rt
);
396 input_sync(input_dev
);
400 if (Rt
|| ts
->pendown
)
401 pr_debug("%s: %d/%d/%d%s\n", ts
->spi
->dev
.bus_id
,
402 x
, y
, Rt
, Rt
? "" : " UP");
405 spin_lock_irqsave(&ts
->lock
, flags
);
407 ts
->pendown
= (Rt
!= 0);
408 mod_timer(&ts
->timer
, jiffies
+ TS_POLL_PERIOD
);
410 spin_unlock_irqrestore(&ts
->lock
, flags
);
413 static void ads7846_debounce(void *ads
)
415 struct ads7846
*ts
= ads
;
416 struct spi_message
*m
;
417 struct spi_transfer
*t
;
421 m
= &ts
->msg
[ts
->msg_idx
];
422 t
= list_entry(m
->transfers
.prev
, struct spi_transfer
, transfer_list
);
423 val
= (be16_to_cpu(*(__be16
*)t
->rx_buf
) >> 3) & 0x0fff;
424 if (!ts
->read_cnt
|| (abs(ts
->last_read
- val
) > ts
->debounce_tol
)) {
425 /* Repeat it, if this was the first read or the read
426 * wasn't consistent enough. */
427 if (ts
->read_cnt
< ts
->debounce_max
) {
431 /* Maximum number of debouncing reached and still
432 * not enough number of consistent readings. Abort
433 * the whole sample, repeat it in the next sampling
438 /* Last message will contain ads7846_rx() as the
439 * completion function.
443 /* Start over collecting consistent readings. */
446 if (++ts
->read_rep
> ts
->debounce_rep
) {
447 /* Got a good reading for this coordinate,
448 * go for the next one. */
455 /* Read more values that are consistent. */
458 status
= spi_async(ts
->spi
, m
);
460 dev_err(&ts
->spi
->dev
, "spi_async --> %d\n",
464 static void ads7846_timer(unsigned long handle
)
466 struct ads7846
*ts
= (void *)handle
;
469 spin_lock_irq(&ts
->lock
);
471 if (unlikely(ts
->msg_idx
&& !ts
->pendown
)) {
472 /* measurement cycle ended */
473 if (!device_suspended(&ts
->spi
->dev
)) {
474 ts
->irq_disabled
= 0;
475 enable_irq(ts
->spi
->irq
);
480 /* pen is still down, continue with the measurement */
482 status
= spi_async(ts
->spi
, &ts
->msg
[0]);
484 dev_err(&ts
->spi
->dev
, "spi_async --> %d\n", status
);
487 spin_unlock_irq(&ts
->lock
);
490 static irqreturn_t
ads7846_irq(int irq
, void *handle
, struct pt_regs
*regs
)
492 struct ads7846
*ts
= handle
;
495 spin_lock_irqsave(&ts
->lock
, flags
);
496 if (likely(ts
->get_pendown_state())) {
497 if (!ts
->irq_disabled
) {
498 /* The ARM do_simple_IRQ() dispatcher doesn't act
499 * like the other dispatchers: it will report IRQs
500 * even after they've been disabled. We work around
501 * that here. (The "generic irq" framework may help...)
503 ts
->irq_disabled
= 1;
504 disable_irq(ts
->spi
->irq
);
506 mod_timer(&ts
->timer
, jiffies
);
509 spin_unlock_irqrestore(&ts
->lock
, flags
);
514 /*--------------------------------------------------------------------------*/
516 /* Must be called with ts->lock held */
517 static void ads7846_disable(struct ads7846
*ts
)
524 /* are we waiting for IRQ, or polling? */
526 ts
->irq_disabled
= 1;
527 disable_irq(ts
->spi
->irq
);
529 /* the timer will run at least once more, and
530 * leave everything in a clean state, IRQ disabled
532 while (ts
->pending
) {
533 spin_unlock_irq(&ts
->lock
);
535 spin_lock_irq(&ts
->lock
);
539 /* we know the chip's in lowpower mode since we always
540 * leave it that way after every request
545 /* Must be called with ts->lock held */
546 static void ads7846_enable(struct ads7846
*ts
)
552 ts
->irq_disabled
= 0;
553 enable_irq(ts
->spi
->irq
);
556 static int ads7846_suspend(struct spi_device
*spi
, pm_message_t message
)
558 struct ads7846
*ts
= dev_get_drvdata(&spi
->dev
);
560 spin_lock_irq(&ts
->lock
);
562 spi
->dev
.power
.power_state
= message
;
565 spin_unlock_irq(&ts
->lock
);
571 static int ads7846_resume(struct spi_device
*spi
)
573 struct ads7846
*ts
= dev_get_drvdata(&spi
->dev
);
575 spin_lock_irq(&ts
->lock
);
577 spi
->dev
.power
.power_state
= PMSG_ON
;
580 spin_unlock_irq(&ts
->lock
);
585 static int __devinit
ads7846_probe(struct spi_device
*spi
)
588 struct input_dev
*input_dev
;
589 struct ads7846_platform_data
*pdata
= spi
->dev
.platform_data
;
590 struct spi_message
*m
;
591 struct spi_transfer
*x
;
595 dev_dbg(&spi
->dev
, "no IRQ?\n");
600 dev_dbg(&spi
->dev
, "no platform data?\n");
604 /* don't exceed max specified sample rate */
605 if (spi
->max_speed_hz
> (125000 * SAMPLE_BITS
)) {
606 dev_dbg(&spi
->dev
, "f(sample) %d KHz?\n",
607 (spi
->max_speed_hz
/SAMPLE_BITS
)/1000);
611 /* REVISIT when the irq can be triggered active-low, or if for some
612 * reason the touchscreen isn't hooked up, we don't need to access
615 if (pdata
->get_pendown_state
== NULL
) {
616 dev_dbg(&spi
->dev
, "no get_pendown_state function?\n");
620 /* We'd set TX wordsize 8 bits and RX wordsize to 13 bits ... except
621 * that even if the hardware can do that, the SPI controller driver
622 * may not. So we stick to very-portable 8 bit words, both RX and TX.
624 spi
->bits_per_word
= 8;
626 ts
= kzalloc(sizeof(struct ads7846
), GFP_KERNEL
);
627 input_dev
= input_allocate_device();
628 if (!ts
|| !input_dev
) {
633 dev_set_drvdata(&spi
->dev
, ts
);
634 spi
->dev
.power
.power_state
= PMSG_ON
;
637 ts
->input
= input_dev
;
639 init_timer(&ts
->timer
);
640 ts
->timer
.data
= (unsigned long) ts
;
641 ts
->timer
.function
= ads7846_timer
;
643 spin_lock_init(&ts
->lock
);
645 ts
->model
= pdata
->model
? : 7846;
646 ts
->vref_delay_usecs
= pdata
->vref_delay_usecs
? : 100;
647 ts
->x_plate_ohms
= pdata
->x_plate_ohms
? : 400;
648 ts
->pressure_max
= pdata
->pressure_max
? : ~0;
649 if (pdata
->debounce_max
) {
650 ts
->debounce_max
= pdata
->debounce_max
;
651 ts
->debounce_tol
= pdata
->debounce_tol
;
652 ts
->debounce_rep
= pdata
->debounce_rep
;
653 if (ts
->debounce_rep
> ts
->debounce_max
+ 1)
654 ts
->debounce_rep
= ts
->debounce_max
- 1;
656 ts
->debounce_tol
= ~0;
657 ts
->get_pendown_state
= pdata
->get_pendown_state
;
659 snprintf(ts
->phys
, sizeof(ts
->phys
), "%s/input0", spi
->dev
.bus_id
);
661 input_dev
->name
= "ADS784x Touchscreen";
662 input_dev
->phys
= ts
->phys
;
663 input_dev
->cdev
.dev
= &spi
->dev
;
665 input_dev
->evbit
[0] = BIT(EV_KEY
) | BIT(EV_ABS
);
666 input_dev
->keybit
[LONG(BTN_TOUCH
)] = BIT(BTN_TOUCH
);
667 input_set_abs_params(input_dev
, ABS_X
,
669 pdata
->x_max
? : MAX_12BIT
,
671 input_set_abs_params(input_dev
, ABS_Y
,
673 pdata
->y_max
? : MAX_12BIT
,
675 input_set_abs_params(input_dev
, ABS_PRESSURE
,
676 pdata
->pressure_min
, pdata
->pressure_max
, 0, 0);
678 /* set up the transfers to read touchscreen state; this assumes we
679 * use formula #2 for pressure, not #3.
686 /* y- still on; turn on only y+ (and ADC) */
688 x
->tx_buf
= &ts
->read_y
;
690 spi_message_add_tail(x
, m
);
693 x
->rx_buf
= &ts
->tc
.y
;
695 spi_message_add_tail(x
, m
);
697 m
->complete
= ads7846_debounce
;
703 /* turn y- off, x+ on, then leave in lowpower */
706 x
->tx_buf
= &ts
->read_x
;
708 spi_message_add_tail(x
, m
);
711 x
->rx_buf
= &ts
->tc
.x
;
713 spi_message_add_tail(x
, m
);
715 m
->complete
= ads7846_debounce
;
718 /* turn y+ off, x- on; we'll use formula #2 */
719 if (ts
->model
== 7846) {
724 ts
->read_z1
= READ_Z1
;
725 x
->tx_buf
= &ts
->read_z1
;
727 spi_message_add_tail(x
, m
);
730 x
->rx_buf
= &ts
->tc
.z1
;
732 spi_message_add_tail(x
, m
);
734 m
->complete
= ads7846_debounce
;
741 ts
->read_z2
= READ_Z2
;
742 x
->tx_buf
= &ts
->read_z2
;
744 spi_message_add_tail(x
, m
);
747 x
->rx_buf
= &ts
->tc
.z2
;
749 spi_message_add_tail(x
, m
);
751 m
->complete
= ads7846_debounce
;
760 ts
->pwrdown
= PWRDOWN
;
761 x
->tx_buf
= &ts
->pwrdown
;
763 spi_message_add_tail(x
, m
);
766 x
->rx_buf
= &ts
->dummy
;
769 spi_message_add_tail(x
, m
);
771 m
->complete
= ads7846_rx
;
776 if (request_irq(spi
->irq
, ads7846_irq
, SA_TRIGGER_FALLING
,
777 spi
->dev
.driver
->name
, ts
)) {
778 dev_dbg(&spi
->dev
, "irq %d busy?\n", spi
->irq
);
783 dev_info(&spi
->dev
, "touchscreen, irq %d\n", spi
->irq
);
785 /* take a first sample, leaving nPENIRQ active; avoid
786 * the touchscreen, in case it's not connected.
788 (void) ads7846_read12_ser(&spi
->dev
,
789 READ_12BIT_SER(vaux
) | ADS_PD10_ALL_ON
);
791 /* ads7843/7845 don't have temperature sensors, and
792 * use the other sensors a bit differently too
794 if (ts
->model
== 7846) {
795 device_create_file(&spi
->dev
, &dev_attr_temp0
);
796 device_create_file(&spi
->dev
, &dev_attr_temp1
);
798 if (ts
->model
!= 7845)
799 device_create_file(&spi
->dev
, &dev_attr_vbatt
);
800 device_create_file(&spi
->dev
, &dev_attr_vaux
);
802 device_create_file(&spi
->dev
, &dev_attr_pen_down
);
804 device_create_file(&spi
->dev
, &dev_attr_disable
);
806 err
= input_register_device(input_dev
);
808 goto err_remove_attr
;
813 device_remove_file(&spi
->dev
, &dev_attr_disable
);
814 device_remove_file(&spi
->dev
, &dev_attr_pen_down
);
815 if (ts
->model
== 7846) {
816 device_remove_file(&spi
->dev
, &dev_attr_temp1
);
817 device_remove_file(&spi
->dev
, &dev_attr_temp0
);
819 if (ts
->model
!= 7845)
820 device_remove_file(&spi
->dev
, &dev_attr_vbatt
);
821 device_remove_file(&spi
->dev
, &dev_attr_vaux
);
823 free_irq(spi
->irq
, ts
);
825 input_free_device(input_dev
);
830 static int __devexit
ads7846_remove(struct spi_device
*spi
)
832 struct ads7846
*ts
= dev_get_drvdata(&spi
->dev
);
834 input_unregister_device(ts
->input
);
836 ads7846_suspend(spi
, PMSG_SUSPEND
);
838 device_remove_file(&spi
->dev
, &dev_attr_disable
);
839 device_remove_file(&spi
->dev
, &dev_attr_pen_down
);
840 if (ts
->model
== 7846) {
841 device_remove_file(&spi
->dev
, &dev_attr_temp1
);
842 device_remove_file(&spi
->dev
, &dev_attr_temp0
);
844 if (ts
->model
!= 7845)
845 device_remove_file(&spi
->dev
, &dev_attr_vbatt
);
846 device_remove_file(&spi
->dev
, &dev_attr_vaux
);
848 free_irq(ts
->spi
->irq
, ts
);
849 /* suspend left the IRQ disabled */
850 enable_irq(ts
->spi
->irq
);
854 dev_dbg(&spi
->dev
, "unregistered touchscreen\n");
858 static struct spi_driver ads7846_driver
= {
861 .bus
= &spi_bus_type
,
862 .owner
= THIS_MODULE
,
864 .probe
= ads7846_probe
,
865 .remove
= __devexit_p(ads7846_remove
),
866 .suspend
= ads7846_suspend
,
867 .resume
= ads7846_resume
,
870 static int __init
ads7846_init(void)
872 /* grr, board-specific init should stay out of drivers!! */
874 #ifdef CONFIG_ARCH_OMAP
875 if (machine_is_omap_osk()) {
876 /* GPIO4 = PENIRQ; GPIO6 = BUSY */
877 omap_request_gpio(4);
878 omap_set_gpio_direction(4, 1);
879 omap_request_gpio(6);
880 omap_set_gpio_direction(6, 1);
882 // also TI 1510 Innovator, bitbanging through FPGA
884 // also Palm Tungsten T2
888 // also Dell Axim X50
889 // also HP iPaq H191x/H192x/H415x/H435x
890 // also Intel Lubbock (additional to UCB1400; as temperature sensor)
891 // also Sharp Zaurus C7xx, C8xx (corgi/sheperd/husky)
893 // Atmel at91sam9261-EK uses ads7843
895 // also various AMD Au1x00 devel boards
897 return spi_register_driver(&ads7846_driver
);
899 module_init(ads7846_init
);
901 static void __exit
ads7846_exit(void)
903 spi_unregister_driver(&ads7846_driver
);
905 #ifdef CONFIG_ARCH_OMAP
906 if (machine_is_omap_osk()) {
913 module_exit(ads7846_exit
);
915 MODULE_DESCRIPTION("ADS7846 TouchScreen Driver");
916 MODULE_LICENSE("GPL");