aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/input/touchscreen
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/input/touchscreen')
-rw-r--r--drivers/input/touchscreen/Kconfig58
-rw-r--r--drivers/input/touchscreen/Makefile3
-rw-r--r--drivers/input/touchscreen/ad7877.c844
-rw-r--r--drivers/input/touchscreen/ad7879.c782
-rw-r--r--drivers/input/touchscreen/mainstone-wm97xx.c3
-rw-r--r--drivers/input/touchscreen/ucb1400_ts.c5
-rw-r--r--drivers/input/touchscreen/wm97xx-core.c13
-rw-r--r--drivers/input/touchscreen/zylonite-wm97xx.c240
8 files changed, 1942 insertions, 6 deletions
diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
index bb6486a8c070..b01fd61dadcc 100644
--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig
@@ -29,6 +29,51 @@ config TOUCHSCREEN_ADS7846
29 To compile this driver as a module, choose M here: the 29 To compile this driver as a module, choose M here: the
30 module will be called ads7846. 30 module will be called ads7846.
31 31
32config TOUCHSCREEN_AD7877
33 tristate "AD7877 based touchscreens"
34 depends on SPI_MASTER
35 help
36 Say Y here if you have a touchscreen interface using the
37 AD7877 controller, and your board-specific initialization
38 code includes that in its table of SPI devices.
39
40 If unsure, say N (but it's safe to say "Y").
41
42 To compile this driver as a module, choose M here: the
43 module will be called ad7877.
44
45config TOUCHSCREEN_AD7879_I2C
46 tristate "AD7879 based touchscreens: AD7879-1 I2C Interface"
47 depends on I2C
48 select TOUCHSCREEN_AD7879
49 help
50 Say Y here if you have a touchscreen interface using the
51 AD7879-1 controller, and your board-specific initialization
52 code includes that in its table of I2C devices.
53
54 If unsure, say N (but it's safe to say "Y").
55
56 To compile this driver as a module, choose M here: the
57 module will be called ad7879.
58
59config TOUCHSCREEN_AD7879_SPI
60 tristate "AD7879 based touchscreens: AD7879 SPI Interface"
61 depends on SPI_MASTER && TOUCHSCREEN_AD7879_I2C = n
62 select TOUCHSCREEN_AD7879
63 help
64 Say Y here if you have a touchscreen interface using the
65 AD7879 controller, and your board-specific initialization
66 code includes that in its table of SPI devices.
67
68 If unsure, say N (but it's safe to say "Y").
69
70 To compile this driver as a module, choose M here: the
71 module will be called ad7879.
72
73config TOUCHSCREEN_AD7879
74 tristate
75 default n
76
32config TOUCHSCREEN_BITSY 77config TOUCHSCREEN_BITSY
33 tristate "Compaq iPAQ H3600 (Bitsy) touchscreen" 78 tristate "Compaq iPAQ H3600 (Bitsy) touchscreen"
34 depends on SA1100_BITSY 79 depends on SA1100_BITSY
@@ -308,6 +353,19 @@ config TOUCHSCREEN_WM97XX_MAINSTONE
308 To compile this driver as a module, choose M here: the 353 To compile this driver as a module, choose M here: the
309 module will be called mainstone-wm97xx. 354 module will be called mainstone-wm97xx.
310 355
356config TOUCHSCREEN_WM97XX_ZYLONITE
357 tristate "Zylonite accelerated touch"
358 depends on TOUCHSCREEN_WM97XX && MACH_ZYLONITE
359 select TOUCHSCREEN_WM9713
360 help
361 Say Y here for support for streaming mode with the touchscreen
362 on Zylonite systems.
363
364 If unsure, say N.
365
366 To compile this driver as a module, choose M here: the
367 module will be called zylonite-wm97xx.
368
311config TOUCHSCREEN_USB_COMPOSITE 369config TOUCHSCREEN_USB_COMPOSITE
312 tristate "USB Touchscreen Driver" 370 tristate "USB Touchscreen Driver"
313 depends on USB_ARCH_HAS_HCD 371 depends on USB_ARCH_HAS_HCD
diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile
index d3375aff46fe..6700f7b9d165 100644
--- a/drivers/input/touchscreen/Makefile
+++ b/drivers/input/touchscreen/Makefile
@@ -6,6 +6,8 @@
6 6
7wm97xx-ts-y := wm97xx-core.o 7wm97xx-ts-y := wm97xx-core.o
8 8
9obj-$(CONFIG_TOUCHSCREEN_AD7877) += ad7877.o
10obj-$(CONFIG_TOUCHSCREEN_AD7879) += ad7879.o
9obj-$(CONFIG_TOUCHSCREEN_ADS7846) += ads7846.o 11obj-$(CONFIG_TOUCHSCREEN_ADS7846) += ads7846.o
10obj-$(CONFIG_TOUCHSCREEN_ATMEL_TSADCC) += atmel_tsadcc.o 12obj-$(CONFIG_TOUCHSCREEN_ATMEL_TSADCC) += atmel_tsadcc.o
11obj-$(CONFIG_TOUCHSCREEN_BITSY) += h3600_ts_input.o 13obj-$(CONFIG_TOUCHSCREEN_BITSY) += h3600_ts_input.o
@@ -34,3 +36,4 @@ wm97xx-ts-$(CONFIG_TOUCHSCREEN_WM9705) += wm9705.o
34wm97xx-ts-$(CONFIG_TOUCHSCREEN_WM9712) += wm9712.o 36wm97xx-ts-$(CONFIG_TOUCHSCREEN_WM9712) += wm9712.o
35wm97xx-ts-$(CONFIG_TOUCHSCREEN_WM9713) += wm9713.o 37wm97xx-ts-$(CONFIG_TOUCHSCREEN_WM9713) += wm9713.o
36obj-$(CONFIG_TOUCHSCREEN_WM97XX_MAINSTONE) += mainstone-wm97xx.o 38obj-$(CONFIG_TOUCHSCREEN_WM97XX_MAINSTONE) += mainstone-wm97xx.o
39obj-$(CONFIG_TOUCHSCREEN_WM97XX_ZYLONITE) += zylonite-wm97xx.o
diff --git a/drivers/input/touchscreen/ad7877.c b/drivers/input/touchscreen/ad7877.c
new file mode 100644
index 000000000000..e4728a28f492
--- /dev/null
+++ b/drivers/input/touchscreen/ad7877.c
@@ -0,0 +1,844 @@
1/*
2 * Copyright (C) 2006-2008 Michael Hennerich, Analog Devices Inc.
3 *
4 * Description: AD7877 based touchscreen, sensor (ADCs), DAC and GPIO driver
5 * Based on: ads7846.c
6 *
7 * Bugs: Enter bugs at http://blackfin.uclinux.org/
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, see the file COPYING, or write
21 * to the Free Software Foundation, Inc.,
22 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
23 *
24 * History:
25 * Copyright (c) 2005 David Brownell
26 * Copyright (c) 2006 Nokia Corporation
27 * Various changes: Imre Deak <imre.deak@nokia.com>
28 *
29 * Using code from:
30 * - corgi_ts.c
31 * Copyright (C) 2004-2005 Richard Purdie
32 * - omap_ts.[hc], ads7846.h, ts_osk.c
33 * Copyright (C) 2002 MontaVista Software
34 * Copyright (C) 2004 Texas Instruments
35 * Copyright (C) 2005 Dirk Behme
36 */
37
38
39#include <linux/device.h>
40#include <linux/init.h>
41#include <linux/delay.h>
42#include <linux/input.h>
43#include <linux/interrupt.h>
44#include <linux/slab.h>
45#include <linux/spi/spi.h>
46#include <linux/spi/ad7877.h>
47#include <asm/irq.h>
48
49#define TS_PEN_UP_TIMEOUT msecs_to_jiffies(50)
50
51#define MAX_SPI_FREQ_HZ 20000000
52#define MAX_12BIT ((1<<12)-1)
53
54#define AD7877_REG_ZEROS 0
55#define AD7877_REG_CTRL1 1
56#define AD7877_REG_CTRL2 2
57#define AD7877_REG_ALERT 3
58#define AD7877_REG_AUX1HIGH 4
59#define AD7877_REG_AUX1LOW 5
60#define AD7877_REG_BAT1HIGH 6
61#define AD7877_REG_BAT1LOW 7
62#define AD7877_REG_BAT2HIGH 8
63#define AD7877_REG_BAT2LOW 9
64#define AD7877_REG_TEMP1HIGH 10
65#define AD7877_REG_TEMP1LOW 11
66#define AD7877_REG_SEQ0 12
67#define AD7877_REG_SEQ1 13
68#define AD7877_REG_DAC 14
69#define AD7877_REG_NONE1 15
70#define AD7877_REG_EXTWRITE 15
71#define AD7877_REG_XPLUS 16
72#define AD7877_REG_YPLUS 17
73#define AD7877_REG_Z2 18
74#define AD7877_REG_aux1 19
75#define AD7877_REG_aux2 20
76#define AD7877_REG_aux3 21
77#define AD7877_REG_bat1 22
78#define AD7877_REG_bat2 23
79#define AD7877_REG_temp1 24
80#define AD7877_REG_temp2 25
81#define AD7877_REG_Z1 26
82#define AD7877_REG_GPIOCTRL1 27
83#define AD7877_REG_GPIOCTRL2 28
84#define AD7877_REG_GPIODATA 29
85#define AD7877_REG_NONE2 30
86#define AD7877_REG_NONE3 31
87
88#define AD7877_SEQ_YPLUS_BIT (1<<11)
89#define AD7877_SEQ_XPLUS_BIT (1<<10)
90#define AD7877_SEQ_Z2_BIT (1<<9)
91#define AD7877_SEQ_AUX1_BIT (1<<8)
92#define AD7877_SEQ_AUX2_BIT (1<<7)
93#define AD7877_SEQ_AUX3_BIT (1<<6)
94#define AD7877_SEQ_BAT1_BIT (1<<5)
95#define AD7877_SEQ_BAT2_BIT (1<<4)
96#define AD7877_SEQ_TEMP1_BIT (1<<3)
97#define AD7877_SEQ_TEMP2_BIT (1<<2)
98#define AD7877_SEQ_Z1_BIT (1<<1)
99
100enum {
101 AD7877_SEQ_YPOS = 0,
102 AD7877_SEQ_XPOS = 1,
103 AD7877_SEQ_Z2 = 2,
104 AD7877_SEQ_AUX1 = 3,
105 AD7877_SEQ_AUX2 = 4,
106 AD7877_SEQ_AUX3 = 5,
107 AD7877_SEQ_BAT1 = 6,
108 AD7877_SEQ_BAT2 = 7,
109 AD7877_SEQ_TEMP1 = 8,
110 AD7877_SEQ_TEMP2 = 9,
111 AD7877_SEQ_Z1 = 10,
112 AD7877_NR_SENSE = 11,
113};
114
115/* DAC Register Default RANGE 0 to Vcc, Volatge Mode, DAC On */
116#define AD7877_DAC_CONF 0x1
117
118/* If gpio3 is set AUX3/GPIO3 acts as GPIO Output */
119#define AD7877_EXTW_GPIO_3_CONF 0x1C4
120#define AD7877_EXTW_GPIO_DATA 0x200
121
122/* Control REG 2 */
123#define AD7877_TMR(x) ((x & 0x3) << 0)
124#define AD7877_REF(x) ((x & 0x1) << 2)
125#define AD7877_POL(x) ((x & 0x1) << 3)
126#define AD7877_FCD(x) ((x & 0x3) << 4)
127#define AD7877_PM(x) ((x & 0x3) << 6)
128#define AD7877_ACQ(x) ((x & 0x3) << 8)
129#define AD7877_AVG(x) ((x & 0x3) << 10)
130
131/* Control REG 1 */
132#define AD7877_SER (1 << 11) /* non-differential */
133#define AD7877_DFR (0 << 11) /* differential */
134
135#define AD7877_MODE_NOC (0) /* Do not convert */
136#define AD7877_MODE_SCC (1) /* Single channel conversion */
137#define AD7877_MODE_SEQ0 (2) /* Sequence 0 in Slave Mode */
138#define AD7877_MODE_SEQ1 (3) /* Sequence 1 in Master Mode */
139
140#define AD7877_CHANADD(x) ((x&0xF)<<7)
141#define AD7877_READADD(x) ((x)<<2)
142#define AD7877_WRITEADD(x) ((x)<<12)
143
144#define AD7877_READ_CHAN(x) (AD7877_WRITEADD(AD7877_REG_CTRL1) | AD7877_SER | \
145 AD7877_MODE_SCC | AD7877_CHANADD(AD7877_REG_ ## x) | \
146 AD7877_READADD(AD7877_REG_ ## x))
147
148#define AD7877_MM_SEQUENCE (AD7877_SEQ_YPLUS_BIT | AD7877_SEQ_XPLUS_BIT | \
149 AD7877_SEQ_Z2_BIT | AD7877_SEQ_Z1_BIT)
150
151/*
152 * Non-touchscreen sensors only use single-ended conversions.
153 */
154
155struct ser_req {
156 u16 reset;
157 u16 ref_on;
158 u16 command;
159 u16 sample;
160 struct spi_message msg;
161 struct spi_transfer xfer[6];
162};
163
164struct ad7877 {
165 struct input_dev *input;
166 char phys[32];
167
168 struct spi_device *spi;
169 u16 model;
170 u16 vref_delay_usecs;
171 u16 x_plate_ohms;
172 u16 pressure_max;
173
174 u16 cmd_crtl1;
175 u16 cmd_crtl2;
176 u16 cmd_dummy;
177 u16 dac;
178
179 u8 stopacq_polarity;
180 u8 first_conversion_delay;
181 u8 acquisition_time;
182 u8 averaging;
183 u8 pen_down_acc_interval;
184
185 u16 conversion_data[AD7877_NR_SENSE];
186
187 struct spi_transfer xfer[AD7877_NR_SENSE + 2];
188 struct spi_message msg;
189
190 struct mutex mutex;
191 unsigned disabled:1; /* P: mutex */
192 unsigned gpio3:1; /* P: mutex */
193 unsigned gpio4:1; /* P: mutex */
194
195 spinlock_t lock;
196 struct timer_list timer; /* P: lock */
197 unsigned pending:1; /* P: lock */
198};
199
200static int gpio3;
201module_param(gpio3, int, 0);
202MODULE_PARM_DESC(gpio3, "If gpio3 is set to 1 AUX3 acts as GPIO3");
203
204/*
205 * ad7877_read/write are only used for initial setup and for sysfs controls.
206 * The main traffic is done using spi_async() in the interrupt handler.
207 */
208
209static int ad7877_read(struct spi_device *spi, u16 reg)
210{
211 struct ser_req *req;
212 int status, ret;
213
214 req = kzalloc(sizeof *req, GFP_KERNEL);
215 if (!req)
216 return -ENOMEM;
217
218 spi_message_init(&req->msg);
219
220 req->command = (u16) (AD7877_WRITEADD(AD7877_REG_CTRL1) |
221 AD7877_READADD(reg));
222 req->xfer[0].tx_buf = &req->command;
223 req->xfer[0].len = 2;
224
225 req->xfer[1].rx_buf = &req->sample;
226 req->xfer[1].len = 2;
227
228 spi_message_add_tail(&req->xfer[0], &req->msg);
229 spi_message_add_tail(&req->xfer[1], &req->msg);
230
231 status = spi_sync(spi, &req->msg);
232 ret = status ? : req->sample;
233
234 kfree(req);
235
236 return ret;
237}
238
239static int ad7877_write(struct spi_device *spi, u16 reg, u16 val)
240{
241 struct ser_req *req;
242 int status;
243
244 req = kzalloc(sizeof *req, GFP_KERNEL);
245 if (!req)
246 return -ENOMEM;
247
248 spi_message_init(&req->msg);
249
250 req->command = (u16) (AD7877_WRITEADD(reg) | (val & MAX_12BIT));
251 req->xfer[0].tx_buf = &req->command;
252 req->xfer[0].len = 2;
253
254 spi_message_add_tail(&req->xfer[0], &req->msg);
255
256 status = spi_sync(spi, &req->msg);
257
258 kfree(req);
259
260 return status;
261}
262
263static int ad7877_read_adc(struct spi_device *spi, unsigned command)
264{
265 struct ad7877 *ts = dev_get_drvdata(&spi->dev);
266 struct ser_req *req;
267 int status;
268 int sample;
269 int i;
270
271 req = kzalloc(sizeof *req, GFP_KERNEL);
272 if (!req)
273 return -ENOMEM;
274
275 spi_message_init(&req->msg);
276
277 /* activate reference, so it has time to settle; */
278 req->ref_on = AD7877_WRITEADD(AD7877_REG_CTRL2) |
279 AD7877_POL(ts->stopacq_polarity) |
280 AD7877_AVG(0) | AD7877_PM(2) | AD7877_TMR(0) |
281 AD7877_ACQ(ts->acquisition_time) | AD7877_FCD(0);
282
283 req->reset = AD7877_WRITEADD(AD7877_REG_CTRL1) | AD7877_MODE_NOC;
284
285 req->command = (u16) command;
286
287 req->xfer[0].tx_buf = &req->reset;
288 req->xfer[0].len = 2;
289
290 req->xfer[1].tx_buf = &req->ref_on;
291 req->xfer[1].len = 2;
292 req->xfer[1].delay_usecs = ts->vref_delay_usecs;
293
294 req->xfer[2].tx_buf = &req->command;
295 req->xfer[2].len = 2;
296 req->xfer[2].delay_usecs = ts->vref_delay_usecs;
297
298 req->xfer[3].rx_buf = &req->sample;
299 req->xfer[3].len = 2;
300
301 req->xfer[4].tx_buf = &ts->cmd_crtl2; /*REF OFF*/
302 req->xfer[4].len = 2;
303
304 req->xfer[5].tx_buf = &ts->cmd_crtl1; /*DEFAULT*/
305 req->xfer[5].len = 2;
306
307 /* group all the transfers together, so we can't interfere with
308 * reading touchscreen state; disable penirq while sampling
309 */
310 for (i = 0; i < 6; i++)
311 spi_message_add_tail(&req->xfer[i], &req->msg);
312
313 status = spi_sync(spi, &req->msg);
314 sample = req->sample;
315
316 kfree(req);
317
318 return status ? : sample;
319}
320
321static void ad7877_rx(struct ad7877 *ts)
322{
323 struct input_dev *input_dev = ts->input;
324 unsigned Rt;
325 u16 x, y, z1, z2;
326
327 x = ts->conversion_data[AD7877_SEQ_XPOS] & MAX_12BIT;
328 y = ts->conversion_data[AD7877_SEQ_YPOS] & MAX_12BIT;
329 z1 = ts->conversion_data[AD7877_SEQ_Z1] & MAX_12BIT;
330 z2 = ts->conversion_data[AD7877_SEQ_Z2] & MAX_12BIT;
331
332 /*
333 * The samples processed here are already preprocessed by the AD7877.
334 * The preprocessing function consists of an averaging filter.
335 * The combination of 'first conversion delay' and averaging provides a robust solution,
336 * discarding the spurious noise in the signal and keeping only the data of interest.
337 * The size of the averaging filter is programmable. (dev.platform_data, see linux/spi/ad7877.h)
338 * Other user-programmable conversion controls include variable acquisition time,
339 * and first conversion delay. Up to 16 averages can be taken per conversion.
340 */
341
342 if (likely(x && z1)) {
343 /* compute touch pressure resistance using equation #1 */
344 Rt = (z2 - z1) * x * ts->x_plate_ohms;
345 Rt /= z1;
346 Rt = (Rt + 2047) >> 12;
347
348 input_report_abs(input_dev, ABS_X, x);
349 input_report_abs(input_dev, ABS_Y, y);
350 input_report_abs(input_dev, ABS_PRESSURE, Rt);
351 input_sync(input_dev);
352 }
353}
354
355static inline void ad7877_ts_event_release(struct ad7877 *ts)
356{
357 struct input_dev *input_dev = ts->input;
358
359 input_report_abs(input_dev, ABS_PRESSURE, 0);
360 input_sync(input_dev);
361}
362
363static void ad7877_timer(unsigned long handle)
364{
365 struct ad7877 *ts = (void *)handle;
366
367 ad7877_ts_event_release(ts);
368}
369
370static irqreturn_t ad7877_irq(int irq, void *handle)
371{
372 struct ad7877 *ts = handle;
373 unsigned long flags;
374 int status;
375
376 /*
377 * The repeated conversion sequencer controlled by TMR kicked off
378 * too fast. We ignore the last and process the sample sequence
379 * currently in the queue. It can't be older than 9.4ms, and we
380 * need to avoid that ts->msg doesn't get issued twice while in work.
381 */
382
383 spin_lock_irqsave(&ts->lock, flags);
384 if (!ts->pending) {
385 ts->pending = 1;
386
387 status = spi_async(ts->spi, &ts->msg);
388 if (status)
389 dev_err(&ts->spi->dev, "spi_sync --> %d\n", status);
390 }
391 spin_unlock_irqrestore(&ts->lock, flags);
392
393 return IRQ_HANDLED;
394}
395
396static void ad7877_callback(void *_ts)
397{
398 struct ad7877 *ts = _ts;
399
400 spin_lock_irq(&ts->lock);
401
402 ad7877_rx(ts);
403 ts->pending = 0;
404 mod_timer(&ts->timer, jiffies + TS_PEN_UP_TIMEOUT);
405
406 spin_unlock_irq(&ts->lock);
407}
408
409static void ad7877_disable(struct ad7877 *ts)
410{
411 mutex_lock(&ts->mutex);
412
413 if (!ts->disabled) {
414 ts->disabled = 1;
415 disable_irq(ts->spi->irq);
416
417 /* Wait for spi_async callback */
418 while (ts->pending)
419 msleep(1);
420
421 if (del_timer_sync(&ts->timer))
422 ad7877_ts_event_release(ts);
423 }
424
425 /* we know the chip's in lowpower mode since we always
426 * leave it that way after every request
427 */
428
429 mutex_unlock(&ts->mutex);
430}
431
432static void ad7877_enable(struct ad7877 *ts)
433{
434 mutex_lock(&ts->mutex);
435
436 if (ts->disabled) {
437 ts->disabled = 0;
438 enable_irq(ts->spi->irq);
439 }
440
441 mutex_unlock(&ts->mutex);
442}
443
444#define SHOW(name) static ssize_t \
445name ## _show(struct device *dev, struct device_attribute *attr, char *buf) \
446{ \
447 struct ad7877 *ts = dev_get_drvdata(dev); \
448 ssize_t v = ad7877_read_adc(ts->spi, \
449 AD7877_READ_CHAN(name)); \
450 if (v < 0) \
451 return v; \
452 return sprintf(buf, "%u\n", (unsigned) v); \
453} \
454static DEVICE_ATTR(name, S_IRUGO, name ## _show, NULL);
455
456SHOW(aux1)
457SHOW(aux2)
458SHOW(aux3)
459SHOW(bat1)
460SHOW(bat2)
461SHOW(temp1)
462SHOW(temp2)
463
464static ssize_t ad7877_disable_show(struct device *dev,
465 struct device_attribute *attr, char *buf)
466{
467 struct ad7877 *ts = dev_get_drvdata(dev);
468
469 return sprintf(buf, "%u\n", ts->disabled);
470}
471
472static ssize_t ad7877_disable_store(struct device *dev,
473 struct device_attribute *attr,
474 const char *buf, size_t count)
475{
476 struct ad7877 *ts = dev_get_drvdata(dev);
477 unsigned long val;
478 int error;
479
480 error = strict_strtoul(buf, 10, &val);
481 if (error)
482 return error;
483
484 if (val)
485 ad7877_disable(ts);
486 else
487 ad7877_enable(ts);
488
489 return count;
490}
491
492static DEVICE_ATTR(disable, 0664, ad7877_disable_show, ad7877_disable_store);
493
494static ssize_t ad7877_dac_show(struct device *dev,
495 struct device_attribute *attr, char *buf)
496{
497 struct ad7877 *ts = dev_get_drvdata(dev);
498
499 return sprintf(buf, "%u\n", ts->dac);
500}
501
502static ssize_t ad7877_dac_store(struct device *dev,
503 struct device_attribute *attr,
504 const char *buf, size_t count)
505{
506 struct ad7877 *ts = dev_get_drvdata(dev);
507 unsigned long val;
508 int error;
509
510 error = strict_strtoul(buf, 10, &val);
511 if (error)
512 return error;
513
514 mutex_lock(&ts->mutex);
515 ts->dac = val & 0xFF;
516 ad7877_write(ts->spi, AD7877_REG_DAC, (ts->dac << 4) | AD7877_DAC_CONF);
517 mutex_unlock(&ts->mutex);
518
519 return count;
520}
521
522static DEVICE_ATTR(dac, 0664, ad7877_dac_show, ad7877_dac_store);
523
524static ssize_t ad7877_gpio3_show(struct device *dev,
525 struct device_attribute *attr, char *buf)
526{
527 struct ad7877 *ts = dev_get_drvdata(dev);
528
529 return sprintf(buf, "%u\n", ts->gpio3);
530}
531
532static ssize_t ad7877_gpio3_store(struct device *dev,
533 struct device_attribute *attr,
534 const char *buf, size_t count)
535{
536 struct ad7877 *ts = dev_get_drvdata(dev);
537 unsigned long val;
538 int error;
539
540 error = strict_strtoul(buf, 10, &val);
541 if (error)
542 return error;
543
544 mutex_lock(&ts->mutex);
545 ts->gpio3 = !!val;
546 ad7877_write(ts->spi, AD7877_REG_EXTWRITE, AD7877_EXTW_GPIO_DATA |
547 (ts->gpio4 << 4) | (ts->gpio3 << 5));
548 mutex_unlock(&ts->mutex);
549
550 return count;
551}
552
553static DEVICE_ATTR(gpio3, 0664, ad7877_gpio3_show, ad7877_gpio3_store);
554
555static ssize_t ad7877_gpio4_show(struct device *dev,
556 struct device_attribute *attr, char *buf)
557{
558 struct ad7877 *ts = dev_get_drvdata(dev);
559
560 return sprintf(buf, "%u\n", ts->gpio4);
561}
562
563static ssize_t ad7877_gpio4_store(struct device *dev,
564 struct device_attribute *attr,
565 const char *buf, size_t count)
566{
567 struct ad7877 *ts = dev_get_drvdata(dev);
568 unsigned long val;
569 int error;
570
571 error = strict_strtoul(buf, 10, &val);
572 if (error)
573 return error;
574
575 mutex_lock(&ts->mutex);
576 ts->gpio4 = !!val;
577 ad7877_write(ts->spi, AD7877_REG_EXTWRITE, AD7877_EXTW_GPIO_DATA |
578 (ts->gpio4 << 4) | (ts->gpio3 << 5));
579 mutex_unlock(&ts->mutex);
580
581 return count;
582}
583
584static DEVICE_ATTR(gpio4, 0664, ad7877_gpio4_show, ad7877_gpio4_store);
585
586static struct attribute *ad7877_attributes[] = {
587 &dev_attr_temp1.attr,
588 &dev_attr_temp2.attr,
589 &dev_attr_aux1.attr,
590 &dev_attr_aux2.attr,
591 &dev_attr_bat1.attr,
592 &dev_attr_bat2.attr,
593 &dev_attr_disable.attr,
594 &dev_attr_dac.attr,
595 &dev_attr_gpio4.attr,
596 NULL
597};
598
599static const struct attribute_group ad7877_attr_group = {
600 .attrs = ad7877_attributes,
601};
602
603static void ad7877_setup_ts_def_msg(struct spi_device *spi, struct ad7877 *ts)
604{
605 struct spi_message *m;
606 int i;
607
608 ts->cmd_crtl2 = AD7877_WRITEADD(AD7877_REG_CTRL2) |
609 AD7877_POL(ts->stopacq_polarity) |
610 AD7877_AVG(ts->averaging) | AD7877_PM(1) |
611 AD7877_TMR(ts->pen_down_acc_interval) |
612 AD7877_ACQ(ts->acquisition_time) |
613 AD7877_FCD(ts->first_conversion_delay);
614
615 ad7877_write(spi, AD7877_REG_CTRL2, ts->cmd_crtl2);
616
617 ts->cmd_crtl1 = AD7877_WRITEADD(AD7877_REG_CTRL1) |
618 AD7877_READADD(AD7877_REG_XPLUS-1) |
619 AD7877_MODE_SEQ1 | AD7877_DFR;
620
621 ad7877_write(spi, AD7877_REG_CTRL1, ts->cmd_crtl1);
622
623 ts->cmd_dummy = 0;
624
625 m = &ts->msg;
626
627 spi_message_init(m);
628
629 m->complete = ad7877_callback;
630 m->context = ts;
631
632 ts->xfer[0].tx_buf = &ts->cmd_crtl1;
633 ts->xfer[0].len = 2;
634
635 spi_message_add_tail(&ts->xfer[0], m);
636
637 ts->xfer[1].tx_buf = &ts->cmd_dummy; /* Send ZERO */
638 ts->xfer[1].len = 2;
639
640 spi_message_add_tail(&ts->xfer[1], m);
641
642 for (i = 0; i < 11; i++) {
643 ts->xfer[i + 2].rx_buf = &ts->conversion_data[AD7877_SEQ_YPOS + i];
644 ts->xfer[i + 2].len = 2;
645 spi_message_add_tail(&ts->xfer[i + 2], m);
646 }
647}
648
649static int __devinit ad7877_probe(struct spi_device *spi)
650{
651 struct ad7877 *ts;
652 struct input_dev *input_dev;
653 struct ad7877_platform_data *pdata = spi->dev.platform_data;
654 int err;
655 u16 verify;
656
657 if (!spi->irq) {
658 dev_dbg(&spi->dev, "no IRQ?\n");
659 return -ENODEV;
660 }
661
662 if (!pdata) {
663 dev_dbg(&spi->dev, "no platform data?\n");
664 return -ENODEV;
665 }
666
667 /* don't exceed max specified SPI CLK frequency */
668 if (spi->max_speed_hz > MAX_SPI_FREQ_HZ) {
669 dev_dbg(&spi->dev, "SPI CLK %d Hz?\n",spi->max_speed_hz);
670 return -EINVAL;
671 }
672
673 ts = kzalloc(sizeof(struct ad7877), GFP_KERNEL);
674 input_dev = input_allocate_device();
675 if (!ts || !input_dev) {
676 err = -ENOMEM;
677 goto err_free_mem;
678 }
679
680 dev_set_drvdata(&spi->dev, ts);
681 ts->spi = spi;
682 ts->input = input_dev;
683
684 setup_timer(&ts->timer, ad7877_timer, (unsigned long) ts);
685 mutex_init(&ts->mutex);
686 spin_lock_init(&ts->lock);
687
688 ts->model = pdata->model ? : 7877;
689 ts->vref_delay_usecs = pdata->vref_delay_usecs ? : 100;
690 ts->x_plate_ohms = pdata->x_plate_ohms ? : 400;
691 ts->pressure_max = pdata->pressure_max ? : ~0;
692
693 ts->stopacq_polarity = pdata->stopacq_polarity;
694 ts->first_conversion_delay = pdata->first_conversion_delay;
695 ts->acquisition_time = pdata->acquisition_time;
696 ts->averaging = pdata->averaging;
697 ts->pen_down_acc_interval = pdata->pen_down_acc_interval;
698
699 snprintf(ts->phys, sizeof(ts->phys), "%s/input0", dev_name(&spi->dev));
700
701 input_dev->name = "AD7877 Touchscreen";
702 input_dev->phys = ts->phys;
703 input_dev->dev.parent = &spi->dev;
704
705 __set_bit(EV_ABS, input_dev->evbit);
706 __set_bit(ABS_X, input_dev->absbit);
707 __set_bit(ABS_Y, input_dev->absbit);
708 __set_bit(ABS_PRESSURE, input_dev->absbit);
709
710 input_set_abs_params(input_dev, ABS_X,
711 pdata->x_min ? : 0,
712 pdata->x_max ? : MAX_12BIT,
713 0, 0);
714 input_set_abs_params(input_dev, ABS_Y,
715 pdata->y_min ? : 0,
716 pdata->y_max ? : MAX_12BIT,
717 0, 0);
718 input_set_abs_params(input_dev, ABS_PRESSURE,
719 pdata->pressure_min, pdata->pressure_max, 0, 0);
720
721 ad7877_write(spi, AD7877_REG_SEQ1, AD7877_MM_SEQUENCE);
722
723 verify = ad7877_read(spi, AD7877_REG_SEQ1);
724
725 if (verify != AD7877_MM_SEQUENCE){
726 dev_err(&spi->dev, "%s: Failed to probe %s\n",
727 dev_name(&spi->dev), input_dev->name);
728 err = -ENODEV;
729 goto err_free_mem;
730 }
731
732 if (gpio3)
733 ad7877_write(spi, AD7877_REG_EXTWRITE, AD7877_EXTW_GPIO_3_CONF);
734
735 ad7877_setup_ts_def_msg(spi, ts);
736
737 /* Request AD7877 /DAV GPIO interrupt */
738
739 err = request_irq(spi->irq, ad7877_irq, IRQF_TRIGGER_FALLING |
740 IRQF_SAMPLE_RANDOM, spi->dev.driver->name, ts);
741 if (err) {
742 dev_dbg(&spi->dev, "irq %d busy?\n", spi->irq);
743 goto err_free_mem;
744 }
745
746 err = sysfs_create_group(&spi->dev.kobj, &ad7877_attr_group);
747 if (err)
748 goto err_free_irq;
749
750 err = device_create_file(&spi->dev,
751 gpio3 ? &dev_attr_gpio3 : &dev_attr_aux3);
752 if (err)
753 goto err_remove_attr_group;
754
755 err = input_register_device(input_dev);
756 if (err)
757 goto err_remove_attr;
758
759 return 0;
760
761err_remove_attr:
762 device_remove_file(&spi->dev,
763 gpio3 ? &dev_attr_gpio3 : &dev_attr_aux3);
764err_remove_attr_group:
765 sysfs_remove_group(&spi->dev.kobj, &ad7877_attr_group);
766err_free_irq:
767 free_irq(spi->irq, ts);
768err_free_mem:
769 input_free_device(input_dev);
770 kfree(ts);
771 dev_set_drvdata(&spi->dev, NULL);
772 return err;
773}
774
775static int __devexit ad7877_remove(struct spi_device *spi)
776{
777 struct ad7877 *ts = dev_get_drvdata(&spi->dev);
778
779 sysfs_remove_group(&spi->dev.kobj, &ad7877_attr_group);
780 device_remove_file(&spi->dev,
781 gpio3 ? &dev_attr_gpio3 : &dev_attr_aux3);
782
783 ad7877_disable(ts);
784 free_irq(ts->spi->irq, ts);
785
786 input_unregister_device(ts->input);
787 kfree(ts);
788
789 dev_dbg(&spi->dev, "unregistered touchscreen\n");
790 dev_set_drvdata(&spi->dev, NULL);
791
792 return 0;
793}
794
795#ifdef CONFIG_PM
796static int ad7877_suspend(struct spi_device *spi, pm_message_t message)
797{
798 struct ad7877 *ts = dev_get_drvdata(&spi->dev);
799
800 ad7877_disable(ts);
801
802 return 0;
803}
804
805static int ad7877_resume(struct spi_device *spi)
806{
807 struct ad7877 *ts = dev_get_drvdata(&spi->dev);
808
809 ad7877_enable(ts);
810
811 return 0;
812}
813#else
814#define ad7877_suspend NULL
815#define ad7877_resume NULL
816#endif
817
818static struct spi_driver ad7877_driver = {
819 .driver = {
820 .name = "ad7877",
821 .bus = &spi_bus_type,
822 .owner = THIS_MODULE,
823 },
824 .probe = ad7877_probe,
825 .remove = __devexit_p(ad7877_remove),
826 .suspend = ad7877_suspend,
827 .resume = ad7877_resume,
828};
829
830static int __init ad7877_init(void)
831{
832 return spi_register_driver(&ad7877_driver);
833}
834module_init(ad7877_init);
835
836static void __exit ad7877_exit(void)
837{
838 spi_unregister_driver(&ad7877_driver);
839}
840module_exit(ad7877_exit);
841
842MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
843MODULE_DESCRIPTION("AD7877 touchscreen Driver");
844MODULE_LICENSE("GPL");
diff --git a/drivers/input/touchscreen/ad7879.c b/drivers/input/touchscreen/ad7879.c
new file mode 100644
index 000000000000..ea4c61d68683
--- /dev/null
+++ b/drivers/input/touchscreen/ad7879.c
@@ -0,0 +1,782 @@
1/*
2 * Copyright (C) 2008 Michael Hennerich, Analog Devices Inc.
3 *
4 * Description: AD7879 based touchscreen, and GPIO driver (I2C/SPI Interface)
5 *
6 * Bugs: Enter bugs at http://blackfin.uclinux.org/
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, see the file COPYING, or write
20 * to the Free Software Foundation, Inc.,
21 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
22 *
23 * History:
24 * Copyright (c) 2005 David Brownell
25 * Copyright (c) 2006 Nokia Corporation
26 * Various changes: Imre Deak <imre.deak@nokia.com>
27 *
28 * Using code from:
29 * - corgi_ts.c
30 * Copyright (C) 2004-2005 Richard Purdie
31 * - omap_ts.[hc], ads7846.h, ts_osk.c
32 * Copyright (C) 2002 MontaVista Software
33 * Copyright (C) 2004 Texas Instruments
34 * Copyright (C) 2005 Dirk Behme
35 * - ad7877.c
36 * Copyright (C) 2006-2008 Analog Devices Inc.
37 */
38
39#include <linux/device.h>
40#include <linux/init.h>
41#include <linux/delay.h>
42#include <linux/input.h>
43#include <linux/interrupt.h>
44#include <linux/irq.h>
45#include <linux/slab.h>
46#include <linux/workqueue.h>
47#include <linux/spi/spi.h>
48#include <linux/i2c.h>
49
50#include <linux/spi/ad7879.h>
51
52#define AD7879_REG_ZEROS 0
53#define AD7879_REG_CTRL1 1
54#define AD7879_REG_CTRL2 2
55#define AD7879_REG_CTRL3 3
56#define AD7879_REG_AUX1HIGH 4
57#define AD7879_REG_AUX1LOW 5
58#define AD7879_REG_TEMP1HIGH 6
59#define AD7879_REG_TEMP1LOW 7
60#define AD7879_REG_XPLUS 8
61#define AD7879_REG_YPLUS 9
62#define AD7879_REG_Z1 10
63#define AD7879_REG_Z2 11
64#define AD7879_REG_AUXVBAT 12
65#define AD7879_REG_TEMP 13
66#define AD7879_REG_REVID 14
67
68/* Control REG 1 */
69#define AD7879_TMR(x) ((x & 0xFF) << 0)
70#define AD7879_ACQ(x) ((x & 0x3) << 8)
71#define AD7879_MODE_NOC (0 << 10) /* Do not convert */
72#define AD7879_MODE_SCC (1 << 10) /* Single channel conversion */
73#define AD7879_MODE_SEQ0 (2 << 10) /* Sequence 0 in Slave Mode */
74#define AD7879_MODE_SEQ1 (3 << 10) /* Sequence 1 in Master Mode */
75#define AD7879_MODE_INT (1 << 15) /* PENIRQ disabled INT enabled */
76
77/* Control REG 2 */
78#define AD7879_FCD(x) ((x & 0x3) << 0)
79#define AD7879_RESET (1 << 4)
80#define AD7879_MFS(x) ((x & 0x3) << 5)
81#define AD7879_AVG(x) ((x & 0x3) << 7)
82#define AD7879_SER (1 << 9) /* non-differential */
83#define AD7879_DFR (0 << 9) /* differential */
84#define AD7879_GPIOPOL (1 << 10)
85#define AD7879_GPIODIR (1 << 11)
86#define AD7879_GPIO_DATA (1 << 12)
87#define AD7879_GPIO_EN (1 << 13)
88#define AD7879_PM(x) ((x & 0x3) << 14)
89#define AD7879_PM_SHUTDOWN (0)
90#define AD7879_PM_DYN (1)
91#define AD7879_PM_FULLON (2)
92
93/* Control REG 3 */
94#define AD7879_TEMPMASK_BIT (1<<15)
95#define AD7879_AUXVBATMASK_BIT (1<<14)
96#define AD7879_INTMODE_BIT (1<<13)
97#define AD7879_GPIOALERTMASK_BIT (1<<12)
98#define AD7879_AUXLOW_BIT (1<<11)
99#define AD7879_AUXHIGH_BIT (1<<10)
100#define AD7879_TEMPLOW_BIT (1<<9)
101#define AD7879_TEMPHIGH_BIT (1<<8)
102#define AD7879_YPLUS_BIT (1<<7)
103#define AD7879_XPLUS_BIT (1<<6)
104#define AD7879_Z1_BIT (1<<5)
105#define AD7879_Z2_BIT (1<<4)
106#define AD7879_AUX_BIT (1<<3)
107#define AD7879_VBAT_BIT (1<<2)
108#define AD7879_TEMP_BIT (1<<1)
109
110enum {
111 AD7879_SEQ_XPOS = 0,
112 AD7879_SEQ_YPOS = 1,
113 AD7879_SEQ_Z1 = 2,
114 AD7879_SEQ_Z2 = 3,
115 AD7879_NR_SENSE = 4,
116};
117
118#define MAX_12BIT ((1<<12)-1)
119#define TS_PEN_UP_TIMEOUT msecs_to_jiffies(50)
120
121#if defined(CONFIG_TOUCHSCREEN_AD7879_SPI) || defined(CONFIG_TOUCHSCREEN_AD7879_SPI_MODULE)
122#define AD7879_DEVID 0x7A
123typedef struct spi_device bus_device;
124#elif defined(CONFIG_TOUCHSCREEN_AD7879_I2C) || defined(CONFIG_TOUCHSCREEN_AD7879_I2C_MODULE)
125#define AD7879_DEVID 0x79
126typedef struct i2c_client bus_device;
127#endif
128
129struct ad7879 {
130 bus_device *bus;
131 struct input_dev *input;
132 struct work_struct work;
133 struct timer_list timer;
134
135 struct mutex mutex;
136 unsigned disabled:1; /* P: mutex */
137
138#if defined(CONFIG_TOUCHSCREEN_AD7879_SPI) || defined(CONFIG_TOUCHSCREEN_AD7879_SPI_MODULE)
139 struct spi_message msg;
140 struct spi_transfer xfer[AD7879_NR_SENSE + 1];
141 u16 cmd;
142#endif
143 u16 conversion_data[AD7879_NR_SENSE];
144 char phys[32];
145 u8 first_conversion_delay;
146 u8 acquisition_time;
147 u8 averaging;
148 u8 pen_down_acc_interval;
149 u8 median;
150 u16 x_plate_ohms;
151 u16 pressure_max;
152 u16 gpio_init;
153 u16 cmd_crtl1;
154 u16 cmd_crtl2;
155 u16 cmd_crtl3;
156 unsigned gpio:1;
157};
158
159static int ad7879_read(bus_device *, u8);
160static int ad7879_write(bus_device *, u8, u16);
161static void ad7879_collect(struct ad7879 *);
162
163static void ad7879_report(struct ad7879 *ts)
164{
165 struct input_dev *input_dev = ts->input;
166 unsigned Rt;
167 u16 x, y, z1, z2;
168
169 x = ts->conversion_data[AD7879_SEQ_XPOS] & MAX_12BIT;
170 y = ts->conversion_data[AD7879_SEQ_YPOS] & MAX_12BIT;
171 z1 = ts->conversion_data[AD7879_SEQ_Z1] & MAX_12BIT;
172 z2 = ts->conversion_data[AD7879_SEQ_Z2] & MAX_12BIT;
173
174 /*
175 * The samples processed here are already preprocessed by the AD7879.
176 * The preprocessing function consists of a median and an averaging filter.
177 * The combination of these two techniques provides a robust solution,
178 * discarding the spurious noise in the signal and keeping only the data of interest.
179 * The size of both filters is programmable. (dev.platform_data, see linux/spi/ad7879.h)
180 * Other user-programmable conversion controls include variable acquisition time,
181 * and first conversion delay. Up to 16 averages can be taken per conversion.
182 */
183
184 if (likely(x && z1)) {
185 /* compute touch pressure resistance using equation #1 */
186 Rt = (z2 - z1) * x * ts->x_plate_ohms;
187 Rt /= z1;
188 Rt = (Rt + 2047) >> 12;
189
190 input_report_abs(input_dev, ABS_X, x);
191 input_report_abs(input_dev, ABS_Y, y);
192 input_report_abs(input_dev, ABS_PRESSURE, Rt);
193 input_sync(input_dev);
194 }
195}
196
197static void ad7879_work(struct work_struct *work)
198{
199 struct ad7879 *ts = container_of(work, struct ad7879, work);
200
201 /* use keventd context to read the result registers */
202 ad7879_collect(ts);
203 ad7879_report(ts);
204 mod_timer(&ts->timer, jiffies + TS_PEN_UP_TIMEOUT);
205}
206
207static void ad7879_ts_event_release(struct ad7879 *ts)
208{
209 struct input_dev *input_dev = ts->input;
210
211 input_report_abs(input_dev, ABS_PRESSURE, 0);
212 input_sync(input_dev);
213}
214
215static void ad7879_timer(unsigned long handle)
216{
217 struct ad7879 *ts = (void *)handle;
218
219 ad7879_ts_event_release(ts);
220}
221
222static irqreturn_t ad7879_irq(int irq, void *handle)
223{
224 struct ad7879 *ts = handle;
225
226 /* The repeated conversion sequencer controlled by TMR kicked off too fast.
227 * We ignore the last and process the sample sequence currently in the queue.
228 * It can't be older than 9.4ms
229 */
230
231 if (!work_pending(&ts->work))
232 schedule_work(&ts->work);
233
234 return IRQ_HANDLED;
235}
236
237static void ad7879_setup(struct ad7879 *ts)
238{
239 ts->cmd_crtl3 = AD7879_YPLUS_BIT |
240 AD7879_XPLUS_BIT |
241 AD7879_Z2_BIT |
242 AD7879_Z1_BIT |
243 AD7879_TEMPMASK_BIT |
244 AD7879_AUXVBATMASK_BIT |
245 AD7879_GPIOALERTMASK_BIT;
246
247 ts->cmd_crtl2 = AD7879_PM(AD7879_PM_DYN) | AD7879_DFR |
248 AD7879_AVG(ts->averaging) |
249 AD7879_MFS(ts->median) |
250 AD7879_FCD(ts->first_conversion_delay) |
251 ts->gpio_init;
252
253 ts->cmd_crtl1 = AD7879_MODE_INT | AD7879_MODE_SEQ1 |
254 AD7879_ACQ(ts->acquisition_time) |
255 AD7879_TMR(ts->pen_down_acc_interval);
256
257 ad7879_write(ts->bus, AD7879_REG_CTRL2, ts->cmd_crtl2);
258 ad7879_write(ts->bus, AD7879_REG_CTRL3, ts->cmd_crtl3);
259 ad7879_write(ts->bus, AD7879_REG_CTRL1, ts->cmd_crtl1);
260}
261
262static void ad7879_disable(struct ad7879 *ts)
263{
264 mutex_lock(&ts->mutex);
265
266 if (!ts->disabled) {
267
268 ts->disabled = 1;
269 disable_irq(ts->bus->irq);
270
271 cancel_work_sync(&ts->work);
272
273 if (del_timer_sync(&ts->timer))
274 ad7879_ts_event_release(ts);
275
276 ad7879_write(ts->bus, AD7879_REG_CTRL2,
277 AD7879_PM(AD7879_PM_SHUTDOWN));
278 }
279
280 mutex_unlock(&ts->mutex);
281}
282
283static void ad7879_enable(struct ad7879 *ts)
284{
285 mutex_lock(&ts->mutex);
286
287 if (ts->disabled) {
288 ad7879_setup(ts);
289 ts->disabled = 0;
290 enable_irq(ts->bus->irq);
291 }
292
293 mutex_unlock(&ts->mutex);
294}
295
296static ssize_t ad7879_disable_show(struct device *dev,
297 struct device_attribute *attr, char *buf)
298{
299 struct ad7879 *ts = dev_get_drvdata(dev);
300
301 return sprintf(buf, "%u\n", ts->disabled);
302}
303
304static ssize_t ad7879_disable_store(struct device *dev,
305 struct device_attribute *attr,
306 const char *buf, size_t count)
307{
308 struct ad7879 *ts = dev_get_drvdata(dev);
309 unsigned long val;
310 int error;
311
312 error = strict_strtoul(buf, 10, &val);
313 if (error)
314 return error;
315
316 if (val)
317 ad7879_disable(ts);
318 else
319 ad7879_enable(ts);
320
321 return count;
322}
323
324static DEVICE_ATTR(disable, 0664, ad7879_disable_show, ad7879_disable_store);
325
326static ssize_t ad7879_gpio_show(struct device *dev,
327 struct device_attribute *attr, char *buf)
328{
329 struct ad7879 *ts = dev_get_drvdata(dev);
330
331 return sprintf(buf, "%u\n", ts->gpio);
332}
333
334static ssize_t ad7879_gpio_store(struct device *dev,
335 struct device_attribute *attr,
336 const char *buf, size_t count)
337{
338 struct ad7879 *ts = dev_get_drvdata(dev);
339 unsigned long val;
340 int error;
341
342 error = strict_strtoul(buf, 10, &val);
343 if (error)
344 return error;
345
346 mutex_lock(&ts->mutex);
347 ts->gpio = !!val;
348 error = ad7879_write(ts->bus, AD7879_REG_CTRL2,
349 ts->gpio ?
350 ts->cmd_crtl2 & ~AD7879_GPIO_DATA :
351 ts->cmd_crtl2 | AD7879_GPIO_DATA);
352 mutex_unlock(&ts->mutex);
353
354 return error ? : count;
355}
356
357static DEVICE_ATTR(gpio, 0664, ad7879_gpio_show, ad7879_gpio_store);
358
359static struct attribute *ad7879_attributes[] = {
360 &dev_attr_disable.attr,
361 &dev_attr_gpio.attr,
362 NULL
363};
364
365static const struct attribute_group ad7879_attr_group = {
366 .attrs = ad7879_attributes,
367};
368
369static int __devinit ad7879_construct(bus_device *bus, struct ad7879 *ts)
370{
371 struct input_dev *input_dev;
372 struct ad7879_platform_data *pdata = bus->dev.platform_data;
373 int err;
374 u16 revid;
375
376 if (!bus->irq) {
377 dev_err(&bus->dev, "no IRQ?\n");
378 return -ENODEV;
379 }
380
381 if (!pdata) {
382 dev_err(&bus->dev, "no platform data?\n");
383 return -ENODEV;
384 }
385
386 input_dev = input_allocate_device();
387 if (!input_dev)
388 return -ENOMEM;
389
390 ts->input = input_dev;
391
392 setup_timer(&ts->timer, ad7879_timer, (unsigned long) ts);
393 INIT_WORK(&ts->work, ad7879_work);
394 mutex_init(&ts->mutex);
395
396 ts->x_plate_ohms = pdata->x_plate_ohms ? : 400;
397 ts->pressure_max = pdata->pressure_max ? : ~0;
398
399 ts->first_conversion_delay = pdata->first_conversion_delay;
400 ts->acquisition_time = pdata->acquisition_time;
401 ts->averaging = pdata->averaging;
402 ts->pen_down_acc_interval = pdata->pen_down_acc_interval;
403 ts->median = pdata->median;
404
405 if (pdata->gpio_output)
406 ts->gpio_init = AD7879_GPIO_EN |
407 (pdata->gpio_default ? 0 : AD7879_GPIO_DATA);
408 else
409 ts->gpio_init = AD7879_GPIO_EN | AD7879_GPIODIR;
410
411 snprintf(ts->phys, sizeof(ts->phys), "%s/input0", dev_name(&bus->dev));
412
413 input_dev->name = "AD7879 Touchscreen";
414 input_dev->phys = ts->phys;
415 input_dev->dev.parent = &bus->dev;
416
417 __set_bit(EV_ABS, input_dev->evbit);
418 __set_bit(ABS_X, input_dev->absbit);
419 __set_bit(ABS_Y, input_dev->absbit);
420 __set_bit(ABS_PRESSURE, input_dev->absbit);
421
422 input_set_abs_params(input_dev, ABS_X,
423 pdata->x_min ? : 0,
424 pdata->x_max ? : MAX_12BIT,
425 0, 0);
426 input_set_abs_params(input_dev, ABS_Y,
427 pdata->y_min ? : 0,
428 pdata->y_max ? : MAX_12BIT,
429 0, 0);
430 input_set_abs_params(input_dev, ABS_PRESSURE,
431 pdata->pressure_min, pdata->pressure_max, 0, 0);
432
433 err = ad7879_write(bus, AD7879_REG_CTRL2, AD7879_RESET);
434
435 if (err < 0) {
436 dev_err(&bus->dev, "Failed to write %s\n", input_dev->name);
437 goto err_free_mem;
438 }
439
440 revid = ad7879_read(bus, AD7879_REG_REVID);
441
442 if ((revid & 0xFF) != AD7879_DEVID) {
443 dev_err(&bus->dev, "Failed to probe %s\n", input_dev->name);
444 err = -ENODEV;
445 goto err_free_mem;
446 }
447
448 ad7879_setup(ts);
449
450 err = request_irq(bus->irq, ad7879_irq,
451 IRQF_TRIGGER_FALLING | IRQF_SAMPLE_RANDOM,
452 bus->dev.driver->name, ts);
453
454 if (err) {
455 dev_err(&bus->dev, "irq %d busy?\n", bus->irq);
456 goto err_free_mem;
457 }
458
459 err = sysfs_create_group(&bus->dev.kobj, &ad7879_attr_group);
460 if (err)
461 goto err_free_irq;
462
463 err = input_register_device(input_dev);
464 if (err)
465 goto err_remove_attr;
466
467 dev_info(&bus->dev, "Rev.%d touchscreen, irq %d\n",
468 revid >> 8, bus->irq);
469
470 return 0;
471
472err_remove_attr:
473 sysfs_remove_group(&bus->dev.kobj, &ad7879_attr_group);
474err_free_irq:
475 free_irq(bus->irq, ts);
476err_free_mem:
477 input_free_device(input_dev);
478
479 return err;
480}
481
482static int __devexit ad7879_destroy(bus_device *bus, struct ad7879 *ts)
483{
484 ad7879_disable(ts);
485 sysfs_remove_group(&ts->bus->dev.kobj, &ad7879_attr_group);
486 free_irq(ts->bus->irq, ts);
487 input_unregister_device(ts->input);
488 dev_dbg(&bus->dev, "unregistered touchscreen\n");
489
490 return 0;
491}
492
493#ifdef CONFIG_PM
494static int ad7879_suspend(bus_device *bus, pm_message_t message)
495{
496 struct ad7879 *ts = dev_get_drvdata(&bus->dev);
497
498 ad7879_disable(ts);
499
500 return 0;
501}
502
503static int ad7879_resume(bus_device *bus)
504{
505 struct ad7879 *ts = dev_get_drvdata(&bus->dev);
506
507 ad7879_enable(ts);
508
509 return 0;
510}
511#else
512#define ad7879_suspend NULL
513#define ad7879_resume NULL
514#endif
515
516#if defined(CONFIG_TOUCHSCREEN_AD7879_SPI) || defined(CONFIG_TOUCHSCREEN_AD7879_SPI_MODULE)
517#define MAX_SPI_FREQ_HZ 5000000
518#define AD7879_CMD_MAGIC 0xE000
519#define AD7879_CMD_READ (1 << 10)
520#define AD7879_WRITECMD(reg) (AD7879_CMD_MAGIC | (reg & 0xF))
521#define AD7879_READCMD(reg) (AD7879_CMD_MAGIC | AD7879_CMD_READ | (reg & 0xF))
522
523struct ser_req {
524 u16 command;
525 u16 data;
526 struct spi_message msg;
527 struct spi_transfer xfer[2];
528};
529
530/*
531 * ad7879_read/write are only used for initial setup and for sysfs controls.
532 * The main traffic is done in ad7879_collect().
533 */
534
535static int ad7879_read(struct spi_device *spi, u8 reg)
536{
537 struct ser_req *req;
538 int status, ret;
539
540 req = kzalloc(sizeof *req, GFP_KERNEL);
541 if (!req)
542 return -ENOMEM;
543
544 spi_message_init(&req->msg);
545
546 req->command = (u16) AD7879_READCMD(reg);
547 req->xfer[0].tx_buf = &req->command;
548 req->xfer[0].len = 2;
549
550 req->xfer[1].rx_buf = &req->data;
551 req->xfer[1].len = 2;
552
553 spi_message_add_tail(&req->xfer[0], &req->msg);
554 spi_message_add_tail(&req->xfer[1], &req->msg);
555
556 status = spi_sync(spi, &req->msg);
557 ret = status ? : req->data;
558
559 kfree(req);
560
561 return ret;
562}
563
564static int ad7879_write(struct spi_device *spi, u8 reg, u16 val)
565{
566 struct ser_req *req;
567 int status;
568
569 req = kzalloc(sizeof *req, GFP_KERNEL);
570 if (!req)
571 return -ENOMEM;
572
573 spi_message_init(&req->msg);
574
575 req->command = (u16) AD7879_WRITECMD(reg);
576 req->xfer[0].tx_buf = &req->command;
577 req->xfer[0].len = 2;
578
579 req->data = val;
580 req->xfer[1].tx_buf = &req->data;
581 req->xfer[1].len = 2;
582
583 spi_message_add_tail(&req->xfer[0], &req->msg);
584 spi_message_add_tail(&req->xfer[1], &req->msg);
585
586 status = spi_sync(spi, &req->msg);
587
588 kfree(req);
589
590 return status;
591}
592
593static void ad7879_collect(struct ad7879 *ts)
594{
595 int status = spi_sync(ts->bus, &ts->msg);
596
597 if (status)
598 dev_err(&ts->bus->dev, "spi_sync --> %d\n", status);
599}
600
601static void ad7879_setup_ts_def_msg(struct ad7879 *ts)
602{
603 struct spi_message *m;
604 int i;
605
606 ts->cmd = (u16) AD7879_READCMD(AD7879_REG_XPLUS);
607
608 m = &ts->msg;
609 spi_message_init(m);
610 ts->xfer[0].tx_buf = &ts->cmd;
611 ts->xfer[0].len = 2;
612
613 spi_message_add_tail(&ts->xfer[0], m);
614
615 for (i = 0; i < AD7879_NR_SENSE; i++) {
616 ts->xfer[i + 1].rx_buf = &ts->conversion_data[i];
617 ts->xfer[i + 1].len = 2;
618 spi_message_add_tail(&ts->xfer[i + 1], m);
619 }
620}
621
622static int __devinit ad7879_probe(struct spi_device *spi)
623{
624 struct ad7879 *ts;
625 int error;
626
627 /* don't exceed max specified SPI CLK frequency */
628 if (spi->max_speed_hz > MAX_SPI_FREQ_HZ) {
629 dev_err(&spi->dev, "SPI CLK %d Hz?\n", spi->max_speed_hz);
630 return -EINVAL;
631 }
632
633 ts = kzalloc(sizeof(struct ad7879), GFP_KERNEL);
634 if (!ts)
635 return -ENOMEM;
636
637 dev_set_drvdata(&spi->dev, ts);
638 ts->bus = spi;
639
640 ad7879_setup_ts_def_msg(ts);
641
642 error = ad7879_construct(spi, ts);
643 if (error) {
644 dev_set_drvdata(&spi->dev, NULL);
645 kfree(ts);
646 }
647
648 return 0;
649}
650
651static int __devexit ad7879_remove(struct spi_device *spi)
652{
653 struct ad7879 *ts = dev_get_drvdata(&spi->dev);
654
655 ad7879_destroy(spi, ts);
656 dev_set_drvdata(&spi->dev, NULL);
657 kfree(ts);
658
659 return 0;
660}
661
662static struct spi_driver ad7879_driver = {
663 .driver = {
664 .name = "ad7879",
665 .bus = &spi_bus_type,
666 .owner = THIS_MODULE,
667 },
668 .probe = ad7879_probe,
669 .remove = __devexit_p(ad7879_remove),
670 .suspend = ad7879_suspend,
671 .resume = ad7879_resume,
672};
673
674static int __init ad7879_init(void)
675{
676 return spi_register_driver(&ad7879_driver);
677}
678module_init(ad7879_init);
679
680static void __exit ad7879_exit(void)
681{
682 spi_unregister_driver(&ad7879_driver);
683}
684module_exit(ad7879_exit);
685
686#elif defined(CONFIG_TOUCHSCREEN_AD7879_I2C) || defined(CONFIG_TOUCHSCREEN_AD7879_I2C_MODULE)
687
688/* All registers are word-sized.
689 * AD7879 uses a high-byte first convention.
690 */
691static int ad7879_read(struct i2c_client *client, u8 reg)
692{
693 return swab16(i2c_smbus_read_word_data(client, reg));
694}
695
696static int ad7879_write(struct i2c_client *client, u8 reg, u16 val)
697{
698 return i2c_smbus_write_word_data(client, reg, swab16(val));
699}
700
701static void ad7879_collect(struct ad7879 *ts)
702{
703 int i;
704
705 for (i = 0; i < AD7879_NR_SENSE; i++)
706 ts->conversion_data[i] = ad7879_read(ts->bus,
707 AD7879_REG_XPLUS + i);
708}
709
710static int __devinit ad7879_probe(struct i2c_client *client,
711 const struct i2c_device_id *id)
712{
713 struct ad7879 *ts;
714 int error;
715
716 if (!i2c_check_functionality(client->adapter,
717 I2C_FUNC_SMBUS_WORD_DATA)) {
718 dev_err(&client->dev, "SMBUS Word Data not Supported\n");
719 return -EIO;
720 }
721
722 ts = kzalloc(sizeof(struct ad7879), GFP_KERNEL);
723 if (!ts)
724 return -ENOMEM;
725
726 i2c_set_clientdata(client, ts);
727 ts->bus = client;
728
729 error = ad7879_construct(client, ts);
730 if (error) {
731 i2c_set_clientdata(client, NULL);
732 kfree(ts);
733 }
734
735 return 0;
736}
737
738static int __devexit ad7879_remove(struct i2c_client *client)
739{
740 struct ad7879 *ts = dev_get_drvdata(&client->dev);
741
742 ad7879_destroy(client, ts);
743 i2c_set_clientdata(client, NULL);
744 kfree(ts);
745
746 return 0;
747}
748
749static const struct i2c_device_id ad7879_id[] = {
750 { "ad7879", 0 },
751 { }
752};
753MODULE_DEVICE_TABLE(i2c, ad7879_id);
754
755static struct i2c_driver ad7879_driver = {
756 .driver = {
757 .name = "ad7879",
758 .owner = THIS_MODULE,
759 },
760 .probe = ad7879_probe,
761 .remove = __devexit_p(ad7879_remove),
762 .suspend = ad7879_suspend,
763 .resume = ad7879_resume,
764 .id_table = ad7879_id,
765};
766
767static int __init ad7879_init(void)
768{
769 return i2c_add_driver(&ad7879_driver);
770}
771module_init(ad7879_init);
772
773static void __exit ad7879_exit(void)
774{
775 i2c_del_driver(&ad7879_driver);
776}
777module_exit(ad7879_exit);
778#endif
779
780MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
781MODULE_DESCRIPTION("AD7879(-1) touchscreen Driver");
782MODULE_LICENSE("GPL");
diff --git a/drivers/input/touchscreen/mainstone-wm97xx.c b/drivers/input/touchscreen/mainstone-wm97xx.c
index 1d11e2be9ef8..dfa6a84ab50a 100644
--- a/drivers/input/touchscreen/mainstone-wm97xx.c
+++ b/drivers/input/touchscreen/mainstone-wm97xx.c
@@ -162,6 +162,7 @@ static int wm97xx_acc_pen_down(struct wm97xx *wm)
162 input_report_abs(wm->input_dev, ABS_X, x & 0xfff); 162 input_report_abs(wm->input_dev, ABS_X, x & 0xfff);
163 input_report_abs(wm->input_dev, ABS_Y, y & 0xfff); 163 input_report_abs(wm->input_dev, ABS_Y, y & 0xfff);
164 input_report_abs(wm->input_dev, ABS_PRESSURE, p & 0xfff); 164 input_report_abs(wm->input_dev, ABS_PRESSURE, p & 0xfff);
165 input_report_key(wm->input_dev, BTN_TOUCH, (p != 0));
165 input_sync(wm->input_dev); 166 input_sync(wm->input_dev);
166 reads++; 167 reads++;
167 } while (reads < cinfo[sp_idx].reads); 168 } while (reads < cinfo[sp_idx].reads);
@@ -245,7 +246,7 @@ static void wm97xx_irq_enable(struct wm97xx *wm, int enable)
245 if (enable) 246 if (enable)
246 enable_irq(wm->pen_irq); 247 enable_irq(wm->pen_irq);
247 else 248 else
248 disable_irq(wm->pen_irq); 249 disable_irq_nosync(wm->pen_irq);
249} 250}
250 251
251static struct wm97xx_mach_ops mainstone_mach_ops = { 252static struct wm97xx_mach_ops mainstone_mach_ops = {
diff --git a/drivers/input/touchscreen/ucb1400_ts.c b/drivers/input/touchscreen/ucb1400_ts.c
index 54986627def0..e868264fe799 100644
--- a/drivers/input/touchscreen/ucb1400_ts.c
+++ b/drivers/input/touchscreen/ucb1400_ts.c
@@ -151,12 +151,14 @@ static void ucb1400_ts_evt_add(struct input_dev *idev, u16 pressure, u16 x, u16
151 input_report_abs(idev, ABS_X, x); 151 input_report_abs(idev, ABS_X, x);
152 input_report_abs(idev, ABS_Y, y); 152 input_report_abs(idev, ABS_Y, y);
153 input_report_abs(idev, ABS_PRESSURE, pressure); 153 input_report_abs(idev, ABS_PRESSURE, pressure);
154 input_report_key(idev, BTN_TOUCH, 1);
154 input_sync(idev); 155 input_sync(idev);
155} 156}
156 157
157static void ucb1400_ts_event_release(struct input_dev *idev) 158static void ucb1400_ts_event_release(struct input_dev *idev)
158{ 159{
159 input_report_abs(idev, ABS_PRESSURE, 0); 160 input_report_abs(idev, ABS_PRESSURE, 0);
161 input_report_key(idev, BTN_TOUCH, 0);
160 input_sync(idev); 162 input_sync(idev);
161} 163}
162 164
@@ -377,7 +379,8 @@ static int ucb1400_ts_probe(struct platform_device *dev)
377 ucb->ts_idev->id.product = ucb->id; 379 ucb->ts_idev->id.product = ucb->id;
378 ucb->ts_idev->open = ucb1400_ts_open; 380 ucb->ts_idev->open = ucb1400_ts_open;
379 ucb->ts_idev->close = ucb1400_ts_close; 381 ucb->ts_idev->close = ucb1400_ts_close;
380 ucb->ts_idev->evbit[0] = BIT_MASK(EV_ABS); 382 ucb->ts_idev->evbit[0] = BIT_MASK(EV_ABS) | BIT_MASK(EV_KEY);
383 ucb->ts_idev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
381 384
382 ucb1400_adc_enable(ucb->ac97); 385 ucb1400_adc_enable(ucb->ac97);
383 x_res = ucb1400_ts_read_xres(ucb); 386 x_res = ucb1400_ts_read_xres(ucb);
diff --git a/drivers/input/touchscreen/wm97xx-core.c b/drivers/input/touchscreen/wm97xx-core.c
index d15aa11d7056..cec480bffe38 100644
--- a/drivers/input/touchscreen/wm97xx-core.c
+++ b/drivers/input/touchscreen/wm97xx-core.c
@@ -409,6 +409,7 @@ static int wm97xx_read_samples(struct wm97xx *wm)
409 wm->pen_is_down = 0; 409 wm->pen_is_down = 0;
410 dev_dbg(wm->dev, "pen up\n"); 410 dev_dbg(wm->dev, "pen up\n");
411 input_report_abs(wm->input_dev, ABS_PRESSURE, 0); 411 input_report_abs(wm->input_dev, ABS_PRESSURE, 0);
412 input_report_key(wm->input_dev, BTN_TOUCH, 0);
412 input_sync(wm->input_dev); 413 input_sync(wm->input_dev);
413 } else if (!(rc & RC_AGAIN)) { 414 } else if (!(rc & RC_AGAIN)) {
414 /* We need high frequency updates only while 415 /* We need high frequency updates only while
@@ -433,6 +434,7 @@ static int wm97xx_read_samples(struct wm97xx *wm)
433 input_report_abs(wm->input_dev, ABS_X, data.x & 0xfff); 434 input_report_abs(wm->input_dev, ABS_X, data.x & 0xfff);
434 input_report_abs(wm->input_dev, ABS_Y, data.y & 0xfff); 435 input_report_abs(wm->input_dev, ABS_Y, data.y & 0xfff);
435 input_report_abs(wm->input_dev, ABS_PRESSURE, data.p & 0xfff); 436 input_report_abs(wm->input_dev, ABS_PRESSURE, data.p & 0xfff);
437 input_report_key(wm->input_dev, BTN_TOUCH, 1);
436 input_sync(wm->input_dev); 438 input_sync(wm->input_dev);
437 wm->pen_is_down = 1; 439 wm->pen_is_down = 1;
438 wm->ts_reader_interval = wm->ts_reader_min_interval; 440 wm->ts_reader_interval = wm->ts_reader_min_interval;
@@ -628,18 +630,21 @@ static int wm97xx_probe(struct device *dev)
628 wm->input_dev->phys = "wm97xx"; 630 wm->input_dev->phys = "wm97xx";
629 wm->input_dev->open = wm97xx_ts_input_open; 631 wm->input_dev->open = wm97xx_ts_input_open;
630 wm->input_dev->close = wm97xx_ts_input_close; 632 wm->input_dev->close = wm97xx_ts_input_close;
631 set_bit(EV_ABS, wm->input_dev->evbit); 633
632 set_bit(ABS_X, wm->input_dev->absbit); 634 __set_bit(EV_ABS, wm->input_dev->evbit);
633 set_bit(ABS_Y, wm->input_dev->absbit); 635 __set_bit(EV_KEY, wm->input_dev->evbit);
634 set_bit(ABS_PRESSURE, wm->input_dev->absbit); 636 __set_bit(BTN_TOUCH, wm->input_dev->keybit);
637
635 input_set_abs_params(wm->input_dev, ABS_X, abs_x[0], abs_x[1], 638 input_set_abs_params(wm->input_dev, ABS_X, abs_x[0], abs_x[1],
636 abs_x[2], 0); 639 abs_x[2], 0);
637 input_set_abs_params(wm->input_dev, ABS_Y, abs_y[0], abs_y[1], 640 input_set_abs_params(wm->input_dev, ABS_Y, abs_y[0], abs_y[1],
638 abs_y[2], 0); 641 abs_y[2], 0);
639 input_set_abs_params(wm->input_dev, ABS_PRESSURE, abs_p[0], abs_p[1], 642 input_set_abs_params(wm->input_dev, ABS_PRESSURE, abs_p[0], abs_p[1],
640 abs_p[2], 0); 643 abs_p[2], 0);
644
641 input_set_drvdata(wm->input_dev, wm); 645 input_set_drvdata(wm->input_dev, wm);
642 wm->input_dev->dev.parent = dev; 646 wm->input_dev->dev.parent = dev;
647
643 ret = input_register_device(wm->input_dev); 648 ret = input_register_device(wm->input_dev);
644 if (ret < 0) 649 if (ret < 0)
645 goto dev_alloc_err; 650 goto dev_alloc_err;
diff --git a/drivers/input/touchscreen/zylonite-wm97xx.c b/drivers/input/touchscreen/zylonite-wm97xx.c
new file mode 100644
index 000000000000..41e4359c277c
--- /dev/null
+++ b/drivers/input/touchscreen/zylonite-wm97xx.c
@@ -0,0 +1,240 @@
1/*
2 * zylonite-wm97xx.c -- Zylonite Continuous Touch screen driver
3 *
4 * Copyright 2004, 2007, 2008 Wolfson Microelectronics PLC.
5 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
6 * Parts Copyright : Ian Molton <spyro@f2s.com>
7 * Andrew Zabolotny <zap@homelink.ru>
8 *
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the
11 * Free Software Foundation; either version 2 of the License, or (at your
12 * option) any later version.
13 *
14 * Notes:
15 * This is a wm97xx extended touch driver supporting interrupt driven
16 * and continuous operation on Marvell Zylonite development systems
17 * (which have a WM9713 on board).
18 */
19
20#include <linux/module.h>
21#include <linux/moduleparam.h>
22#include <linux/kernel.h>
23#include <linux/init.h>
24#include <linux/delay.h>
25#include <linux/irq.h>
26#include <linux/interrupt.h>
27#include <linux/io.h>
28#include <linux/wm97xx.h>
29
30#include <mach/hardware.h>
31#include <mach/mfp.h>
32#include <mach/regs-ac97.h>
33
34struct continuous {
35 u16 id; /* codec id */
36 u8 code; /* continuous code */
37 u8 reads; /* number of coord reads per read cycle */
38 u32 speed; /* number of coords per second */
39};
40
41#define WM_READS(sp) ((sp / HZ) + 1)
42
43static const struct continuous cinfo[] = {
44 { WM9713_ID2, 0, WM_READS(94), 94 },
45 { WM9713_ID2, 1, WM_READS(120), 120 },
46 { WM9713_ID2, 2, WM_READS(154), 154 },
47 { WM9713_ID2, 3, WM_READS(188), 188 },
48};
49
50/* continuous speed index */
51static int sp_idx;
52
53/*
54 * Pen sampling frequency (Hz) in continuous mode.
55 */
56static int cont_rate = 200;
57module_param(cont_rate, int, 0);
58MODULE_PARM_DESC(cont_rate, "Sampling rate in continuous mode (Hz)");
59
60/*
61 * Pressure readback.
62 *
63 * Set to 1 to read back pen down pressure
64 */
65static int pressure;
66module_param(pressure, int, 0);
67MODULE_PARM_DESC(pressure, "Pressure readback (1 = pressure, 0 = no pressure)");
68
69/*
70 * AC97 touch data slot.
71 *
72 * Touch screen readback data ac97 slot
73 */
74static int ac97_touch_slot = 5;
75module_param(ac97_touch_slot, int, 0);
76MODULE_PARM_DESC(ac97_touch_slot, "Touch screen data slot AC97 number");
77
78
79/* flush AC97 slot 5 FIFO machines */
80static void wm97xx_acc_pen_up(struct wm97xx *wm)
81{
82 int i;
83
84 msleep(1);
85
86 for (i = 0; i < 16; i++)
87 MODR;
88}
89
90static int wm97xx_acc_pen_down(struct wm97xx *wm)
91{
92 u16 x, y, p = 0x100 | WM97XX_ADCSEL_PRES;
93 int reads = 0;
94 static u16 last, tries;
95
96 /* When the AC97 queue has been drained we need to allow time
97 * to buffer up samples otherwise we end up spinning polling
98 * for samples. The controller can't have a suitably low
99 * threashold set to use the notifications it gives.
100 */
101 msleep(1);
102
103 if (tries > 5) {
104 tries = 0;
105 return RC_PENUP;
106 }
107
108 x = MODR;
109 if (x == last) {
110 tries++;
111 return RC_AGAIN;
112 }
113 last = x;
114 do {
115 if (reads)
116 x = MODR;
117 y = MODR;
118 if (pressure)
119 p = MODR;
120
121 /* are samples valid */
122 if ((x & WM97XX_ADCSRC_MASK) != WM97XX_ADCSEL_X ||
123 (y & WM97XX_ADCSRC_MASK) != WM97XX_ADCSEL_Y ||
124 (p & WM97XX_ADCSRC_MASK) != WM97XX_ADCSEL_PRES)
125 goto up;
126
127 /* coordinate is good */
128 tries = 0;
129 input_report_abs(wm->input_dev, ABS_X, x & 0xfff);
130 input_report_abs(wm->input_dev, ABS_Y, y & 0xfff);
131 input_report_abs(wm->input_dev, ABS_PRESSURE, p & 0xfff);
132 input_report_key(wm->input_dev, BTN_TOUCH, (p != 0));
133 input_sync(wm->input_dev);
134 reads++;
135 } while (reads < cinfo[sp_idx].reads);
136up:
137 return RC_PENDOWN | RC_AGAIN;
138}
139
140static int wm97xx_acc_startup(struct wm97xx *wm)
141{
142 int idx;
143
144 /* check we have a codec */
145 if (wm->ac97 == NULL)
146 return -ENODEV;
147
148 /* Go you big red fire engine */
149 for (idx = 0; idx < ARRAY_SIZE(cinfo); idx++) {
150 if (wm->id != cinfo[idx].id)
151 continue;
152 sp_idx = idx;
153 if (cont_rate <= cinfo[idx].speed)
154 break;
155 }
156 wm->acc_rate = cinfo[sp_idx].code;
157 wm->acc_slot = ac97_touch_slot;
158 dev_info(wm->dev,
159 "zylonite accelerated touchscreen driver, %d samples/sec\n",
160 cinfo[sp_idx].speed);
161
162 return 0;
163}
164
165static void wm97xx_irq_enable(struct wm97xx *wm, int enable)
166{
167 if (enable)
168 enable_irq(wm->pen_irq);
169 else
170 disable_irq_nosync(wm->pen_irq);
171}
172
173static struct wm97xx_mach_ops zylonite_mach_ops = {
174 .acc_enabled = 1,
175 .acc_pen_up = wm97xx_acc_pen_up,
176 .acc_pen_down = wm97xx_acc_pen_down,
177 .acc_startup = wm97xx_acc_startup,
178 .irq_enable = wm97xx_irq_enable,
179 .irq_gpio = WM97XX_GPIO_2,
180};
181
182static int zylonite_wm97xx_probe(struct platform_device *pdev)
183{
184 struct wm97xx *wm = platform_get_drvdata(pdev);
185 int gpio_touch_irq;
186
187 if (cpu_is_pxa320())
188 gpio_touch_irq = mfp_to_gpio(MFP_PIN_GPIO15);
189 else
190 gpio_touch_irq = mfp_to_gpio(MFP_PIN_GPIO26);
191
192 wm->pen_irq = IRQ_GPIO(gpio_touch_irq);
193 set_irq_type(IRQ_GPIO(gpio_touch_irq), IRQ_TYPE_EDGE_BOTH);
194
195 wm97xx_config_gpio(wm, WM97XX_GPIO_13, WM97XX_GPIO_IN,
196 WM97XX_GPIO_POL_HIGH,
197 WM97XX_GPIO_STICKY,
198 WM97XX_GPIO_WAKE);
199 wm97xx_config_gpio(wm, WM97XX_GPIO_2, WM97XX_GPIO_OUT,
200 WM97XX_GPIO_POL_HIGH,
201 WM97XX_GPIO_NOTSTICKY,
202 WM97XX_GPIO_NOWAKE);
203
204 return wm97xx_register_mach_ops(wm, &zylonite_mach_ops);
205}
206
207static int zylonite_wm97xx_remove(struct platform_device *pdev)
208{
209 struct wm97xx *wm = platform_get_drvdata(pdev);
210
211 wm97xx_unregister_mach_ops(wm);
212
213 return 0;
214}
215
216static struct platform_driver zylonite_wm97xx_driver = {
217 .probe = zylonite_wm97xx_probe,
218 .remove = zylonite_wm97xx_remove,
219 .driver = {
220 .name = "wm97xx-touch",
221 },
222};
223
224static int __init zylonite_wm97xx_init(void)
225{
226 return platform_driver_register(&zylonite_wm97xx_driver);
227}
228
229static void __exit zylonite_wm97xx_exit(void)
230{
231 platform_driver_unregister(&zylonite_wm97xx_driver);
232}
233
234module_init(zylonite_wm97xx_init);
235module_exit(zylonite_wm97xx_exit);
236
237/* Module information */
238MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
239MODULE_DESCRIPTION("wm97xx continuous touch driver for Zylonite");
240MODULE_LICENSE("GPL");
generated by cgit v1.2.2 (git 2.25.0) at 2026-02-20 16:40:24 -0500