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-rw-r--r--drivers/input/touchscreen/Kconfig32
-rw-r--r--drivers/input/touchscreen/Makefile1
-rw-r--r--drivers/input/touchscreen/ad7879.c782
-rw-r--r--include/linux/spi/ad7879.h35
4 files changed, 850 insertions, 0 deletions
diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
index afeb7554bfe2..b01fd61dadcc 100644
--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig
@@ -42,6 +42,38 @@ config TOUCHSCREEN_AD7877
42 To compile this driver as a module, choose M here: the 42 To compile this driver as a module, choose M here: the
43 module will be called ad7877. 43 module will be called ad7877.
44 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
45config TOUCHSCREEN_BITSY 77config TOUCHSCREEN_BITSY
46 tristate "Compaq iPAQ H3600 (Bitsy) touchscreen" 78 tristate "Compaq iPAQ H3600 (Bitsy) touchscreen"
47 depends on SA1100_BITSY 79 depends on SA1100_BITSY
diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile
index 45dfcd61be11..6700f7b9d165 100644
--- a/drivers/input/touchscreen/Makefile
+++ b/drivers/input/touchscreen/Makefile
@@ -7,6 +7,7 @@
7wm97xx-ts-y := wm97xx-core.o 7wm97xx-ts-y := wm97xx-core.o
8 8
9obj-$(CONFIG_TOUCHSCREEN_AD7877) += ad7877.o 9obj-$(CONFIG_TOUCHSCREEN_AD7877) += ad7877.o
10obj-$(CONFIG_TOUCHSCREEN_AD7879) += ad7879.o
10obj-$(CONFIG_TOUCHSCREEN_ADS7846) += ads7846.o 11obj-$(CONFIG_TOUCHSCREEN_ADS7846) += ads7846.o
11obj-$(CONFIG_TOUCHSCREEN_ATMEL_TSADCC) += atmel_tsadcc.o 12obj-$(CONFIG_TOUCHSCREEN_ATMEL_TSADCC) += atmel_tsadcc.o
12obj-$(CONFIG_TOUCHSCREEN_BITSY) += h3600_ts_input.o 13obj-$(CONFIG_TOUCHSCREEN_BITSY) += h3600_ts_input.o
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/include/linux/spi/ad7879.h b/include/linux/spi/ad7879.h
new file mode 100644
index 000000000000..4231104c9afa
--- /dev/null
+++ b/include/linux/spi/ad7879.h
@@ -0,0 +1,35 @@
1/* linux/spi/ad7879.h */
2
3/* Touchscreen characteristics vary between boards and models. The
4 * platform_data for the device's "struct device" holds this information.
5 *
6 * It's OK if the min/max values are zero.
7 */
8struct ad7879_platform_data {
9 u16 model; /* 7879 */
10 u16 x_plate_ohms;
11 u16 x_min, x_max;
12 u16 y_min, y_max;
13 u16 pressure_min, pressure_max;
14
15 /* [0..255] 0=OFF Starts at 1=550us and goes
16 * all the way to 9.440ms in steps of 35us.
17 */
18 u8 pen_down_acc_interval;
19 /* [0..15] Starts at 0=128us and goes all the
20 * way to 4.096ms in steps of 128us.
21 */
22 u8 first_conversion_delay;
23 /* [0..3] 0 = 2us, 1 = 4us, 2 = 8us, 3 = 16us */
24 u8 acquisition_time;
25 /* [0..3] Average X middle samples 0 = 2, 1 = 4, 2 = 8, 3 = 16 */
26 u8 averaging;
27 /* [0..3] Perform X measurements 0 = OFF,
28 * 1 = 4, 2 = 8, 3 = 16 (median > averaging)
29 */
30 u8 median;
31 /* 1 = AUX/VBAT/GPIO set to GPIO Output */
32 u8 gpio_output;
33 /* Initial GPIO pin state (valid if gpio_output = 1) */
34 u8 gpio_default;
35};
generated by cgit v1.2.2 (git 2.25.0) at 2026-01-01 06:58:39 -0500