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331b78ed MH |
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 | ||
4eb6f91b | 49 | #define TS_PEN_UP_TIMEOUT msecs_to_jiffies(100) |
331b78ed MH |
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 | ||
100 | enum { | |
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 | ||
155 | struct ser_req { | |
156 | u16 reset; | |
157 | u16 ref_on; | |
158 | u16 command; | |
331b78ed MH |
159 | struct spi_message msg; |
160 | struct spi_transfer xfer[6]; | |
3843384a OS |
161 | |
162 | /* | |
163 | * DMA (thus cache coherency maintenance) requires the | |
164 | * transfer buffers to live in their own cache lines. | |
165 | */ | |
166 | u16 sample ____cacheline_aligned; | |
331b78ed MH |
167 | }; |
168 | ||
169 | struct ad7877 { | |
170 | struct input_dev *input; | |
171 | char phys[32]; | |
172 | ||
173 | struct spi_device *spi; | |
174 | u16 model; | |
175 | u16 vref_delay_usecs; | |
176 | u16 x_plate_ohms; | |
177 | u16 pressure_max; | |
178 | ||
179 | u16 cmd_crtl1; | |
180 | u16 cmd_crtl2; | |
181 | u16 cmd_dummy; | |
182 | u16 dac; | |
183 | ||
184 | u8 stopacq_polarity; | |
185 | u8 first_conversion_delay; | |
186 | u8 acquisition_time; | |
187 | u8 averaging; | |
188 | u8 pen_down_acc_interval; | |
189 | ||
331b78ed MH |
190 | struct spi_transfer xfer[AD7877_NR_SENSE + 2]; |
191 | struct spi_message msg; | |
192 | ||
193 | struct mutex mutex; | |
194 | unsigned disabled:1; /* P: mutex */ | |
195 | unsigned gpio3:1; /* P: mutex */ | |
196 | unsigned gpio4:1; /* P: mutex */ | |
197 | ||
198 | spinlock_t lock; | |
199 | struct timer_list timer; /* P: lock */ | |
200 | unsigned pending:1; /* P: lock */ | |
3843384a OS |
201 | |
202 | /* | |
203 | * DMA (thus cache coherency maintenance) requires the | |
204 | * transfer buffers to live in their own cache lines. | |
205 | */ | |
206 | u16 conversion_data[AD7877_NR_SENSE] ____cacheline_aligned; | |
331b78ed MH |
207 | }; |
208 | ||
2fd18aba DT |
209 | static bool gpio3; |
210 | module_param(gpio3, bool, 0); | |
331b78ed MH |
211 | MODULE_PARM_DESC(gpio3, "If gpio3 is set to 1 AUX3 acts as GPIO3"); |
212 | ||
213 | /* | |
214 | * ad7877_read/write are only used for initial setup and for sysfs controls. | |
215 | * The main traffic is done using spi_async() in the interrupt handler. | |
216 | */ | |
217 | ||
218 | static int ad7877_read(struct spi_device *spi, u16 reg) | |
219 | { | |
220 | struct ser_req *req; | |
221 | int status, ret; | |
222 | ||
223 | req = kzalloc(sizeof *req, GFP_KERNEL); | |
224 | if (!req) | |
225 | return -ENOMEM; | |
226 | ||
227 | spi_message_init(&req->msg); | |
228 | ||
229 | req->command = (u16) (AD7877_WRITEADD(AD7877_REG_CTRL1) | | |
230 | AD7877_READADD(reg)); | |
231 | req->xfer[0].tx_buf = &req->command; | |
232 | req->xfer[0].len = 2; | |
e92c27fb | 233 | req->xfer[0].cs_change = 1; |
331b78ed MH |
234 | |
235 | req->xfer[1].rx_buf = &req->sample; | |
236 | req->xfer[1].len = 2; | |
237 | ||
238 | spi_message_add_tail(&req->xfer[0], &req->msg); | |
239 | spi_message_add_tail(&req->xfer[1], &req->msg); | |
240 | ||
241 | status = spi_sync(spi, &req->msg); | |
242 | ret = status ? : req->sample; | |
243 | ||
244 | kfree(req); | |
245 | ||
246 | return ret; | |
247 | } | |
248 | ||
249 | static int ad7877_write(struct spi_device *spi, u16 reg, u16 val) | |
250 | { | |
251 | struct ser_req *req; | |
252 | int status; | |
253 | ||
254 | req = kzalloc(sizeof *req, GFP_KERNEL); | |
255 | if (!req) | |
256 | return -ENOMEM; | |
257 | ||
258 | spi_message_init(&req->msg); | |
259 | ||
260 | req->command = (u16) (AD7877_WRITEADD(reg) | (val & MAX_12BIT)); | |
261 | req->xfer[0].tx_buf = &req->command; | |
262 | req->xfer[0].len = 2; | |
263 | ||
264 | spi_message_add_tail(&req->xfer[0], &req->msg); | |
265 | ||
266 | status = spi_sync(spi, &req->msg); | |
267 | ||
268 | kfree(req); | |
269 | ||
270 | return status; | |
271 | } | |
272 | ||
273 | static int ad7877_read_adc(struct spi_device *spi, unsigned command) | |
274 | { | |
275 | struct ad7877 *ts = dev_get_drvdata(&spi->dev); | |
276 | struct ser_req *req; | |
277 | int status; | |
278 | int sample; | |
279 | int i; | |
280 | ||
281 | req = kzalloc(sizeof *req, GFP_KERNEL); | |
282 | if (!req) | |
283 | return -ENOMEM; | |
284 | ||
285 | spi_message_init(&req->msg); | |
286 | ||
287 | /* activate reference, so it has time to settle; */ | |
288 | req->ref_on = AD7877_WRITEADD(AD7877_REG_CTRL2) | | |
289 | AD7877_POL(ts->stopacq_polarity) | | |
290 | AD7877_AVG(0) | AD7877_PM(2) | AD7877_TMR(0) | | |
291 | AD7877_ACQ(ts->acquisition_time) | AD7877_FCD(0); | |
292 | ||
293 | req->reset = AD7877_WRITEADD(AD7877_REG_CTRL1) | AD7877_MODE_NOC; | |
294 | ||
295 | req->command = (u16) command; | |
296 | ||
297 | req->xfer[0].tx_buf = &req->reset; | |
298 | req->xfer[0].len = 2; | |
e92c27fb | 299 | req->xfer[0].cs_change = 1; |
331b78ed MH |
300 | |
301 | req->xfer[1].tx_buf = &req->ref_on; | |
302 | req->xfer[1].len = 2; | |
303 | req->xfer[1].delay_usecs = ts->vref_delay_usecs; | |
e92c27fb | 304 | req->xfer[1].cs_change = 1; |
331b78ed MH |
305 | |
306 | req->xfer[2].tx_buf = &req->command; | |
307 | req->xfer[2].len = 2; | |
308 | req->xfer[2].delay_usecs = ts->vref_delay_usecs; | |
e92c27fb | 309 | req->xfer[2].cs_change = 1; |
331b78ed MH |
310 | |
311 | req->xfer[3].rx_buf = &req->sample; | |
312 | req->xfer[3].len = 2; | |
e92c27fb | 313 | req->xfer[3].cs_change = 1; |
331b78ed MH |
314 | |
315 | req->xfer[4].tx_buf = &ts->cmd_crtl2; /*REF OFF*/ | |
316 | req->xfer[4].len = 2; | |
e92c27fb | 317 | req->xfer[4].cs_change = 1; |
331b78ed MH |
318 | |
319 | req->xfer[5].tx_buf = &ts->cmd_crtl1; /*DEFAULT*/ | |
320 | req->xfer[5].len = 2; | |
321 | ||
322 | /* group all the transfers together, so we can't interfere with | |
323 | * reading touchscreen state; disable penirq while sampling | |
324 | */ | |
325 | for (i = 0; i < 6; i++) | |
326 | spi_message_add_tail(&req->xfer[i], &req->msg); | |
327 | ||
328 | status = spi_sync(spi, &req->msg); | |
329 | sample = req->sample; | |
330 | ||
331 | kfree(req); | |
332 | ||
333 | return status ? : sample; | |
334 | } | |
335 | ||
47026b25 | 336 | static int ad7877_rx(struct ad7877 *ts) |
331b78ed MH |
337 | { |
338 | struct input_dev *input_dev = ts->input; | |
339 | unsigned Rt; | |
340 | u16 x, y, z1, z2; | |
341 | ||
342 | x = ts->conversion_data[AD7877_SEQ_XPOS] & MAX_12BIT; | |
343 | y = ts->conversion_data[AD7877_SEQ_YPOS] & MAX_12BIT; | |
344 | z1 = ts->conversion_data[AD7877_SEQ_Z1] & MAX_12BIT; | |
345 | z2 = ts->conversion_data[AD7877_SEQ_Z2] & MAX_12BIT; | |
346 | ||
347 | /* | |
348 | * The samples processed here are already preprocessed by the AD7877. | |
349 | * The preprocessing function consists of an averaging filter. | |
350 | * The combination of 'first conversion delay' and averaging provides a robust solution, | |
351 | * discarding the spurious noise in the signal and keeping only the data of interest. | |
352 | * The size of the averaging filter is programmable. (dev.platform_data, see linux/spi/ad7877.h) | |
353 | * Other user-programmable conversion controls include variable acquisition time, | |
354 | * and first conversion delay. Up to 16 averages can be taken per conversion. | |
355 | */ | |
356 | ||
357 | if (likely(x && z1)) { | |
358 | /* compute touch pressure resistance using equation #1 */ | |
359 | Rt = (z2 - z1) * x * ts->x_plate_ohms; | |
360 | Rt /= z1; | |
361 | Rt = (Rt + 2047) >> 12; | |
362 | ||
1d02ad43 MH |
363 | /* |
364 | * Sample found inconsistent, pressure is beyond | |
365 | * the maximum. Don't report it to user space. | |
366 | */ | |
367 | if (Rt > ts->pressure_max) | |
368 | return -EINVAL; | |
369 | ||
47026b25 MH |
370 | if (!timer_pending(&ts->timer)) |
371 | input_report_key(input_dev, BTN_TOUCH, 1); | |
372 | ||
331b78ed MH |
373 | input_report_abs(input_dev, ABS_X, x); |
374 | input_report_abs(input_dev, ABS_Y, y); | |
375 | input_report_abs(input_dev, ABS_PRESSURE, Rt); | |
376 | input_sync(input_dev); | |
47026b25 | 377 | return 0; |
331b78ed | 378 | } |
47026b25 MH |
379 | |
380 | return -EINVAL; | |
331b78ed MH |
381 | } |
382 | ||
383 | static inline void ad7877_ts_event_release(struct ad7877 *ts) | |
384 | { | |
385 | struct input_dev *input_dev = ts->input; | |
386 | ||
387 | input_report_abs(input_dev, ABS_PRESSURE, 0); | |
47026b25 | 388 | input_report_key(input_dev, BTN_TOUCH, 0); |
331b78ed MH |
389 | input_sync(input_dev); |
390 | } | |
391 | ||
392 | static void ad7877_timer(unsigned long handle) | |
393 | { | |
394 | struct ad7877 *ts = (void *)handle; | |
395 | ||
396 | ad7877_ts_event_release(ts); | |
397 | } | |
398 | ||
399 | static irqreturn_t ad7877_irq(int irq, void *handle) | |
400 | { | |
401 | struct ad7877 *ts = handle; | |
402 | unsigned long flags; | |
403 | int status; | |
404 | ||
405 | /* | |
406 | * The repeated conversion sequencer controlled by TMR kicked off | |
407 | * too fast. We ignore the last and process the sample sequence | |
408 | * currently in the queue. It can't be older than 9.4ms, and we | |
409 | * need to avoid that ts->msg doesn't get issued twice while in work. | |
410 | */ | |
411 | ||
412 | spin_lock_irqsave(&ts->lock, flags); | |
413 | if (!ts->pending) { | |
414 | ts->pending = 1; | |
415 | ||
416 | status = spi_async(ts->spi, &ts->msg); | |
417 | if (status) | |
418 | dev_err(&ts->spi->dev, "spi_sync --> %d\n", status); | |
419 | } | |
420 | spin_unlock_irqrestore(&ts->lock, flags); | |
421 | ||
422 | return IRQ_HANDLED; | |
423 | } | |
424 | ||
425 | static void ad7877_callback(void *_ts) | |
426 | { | |
427 | struct ad7877 *ts = _ts; | |
428 | ||
429 | spin_lock_irq(&ts->lock); | |
47026b25 MH |
430 | if (!ad7877_rx(ts)) |
431 | mod_timer(&ts->timer, jiffies + TS_PEN_UP_TIMEOUT); | |
331b78ed | 432 | ts->pending = 0; |
331b78ed MH |
433 | spin_unlock_irq(&ts->lock); |
434 | } | |
435 | ||
436 | static void ad7877_disable(struct ad7877 *ts) | |
437 | { | |
438 | mutex_lock(&ts->mutex); | |
439 | ||
440 | if (!ts->disabled) { | |
441 | ts->disabled = 1; | |
442 | disable_irq(ts->spi->irq); | |
443 | ||
444 | /* Wait for spi_async callback */ | |
445 | while (ts->pending) | |
446 | msleep(1); | |
447 | ||
448 | if (del_timer_sync(&ts->timer)) | |
449 | ad7877_ts_event_release(ts); | |
450 | } | |
451 | ||
452 | /* we know the chip's in lowpower mode since we always | |
453 | * leave it that way after every request | |
454 | */ | |
455 | ||
456 | mutex_unlock(&ts->mutex); | |
457 | } | |
458 | ||
459 | static void ad7877_enable(struct ad7877 *ts) | |
460 | { | |
461 | mutex_lock(&ts->mutex); | |
462 | ||
463 | if (ts->disabled) { | |
464 | ts->disabled = 0; | |
465 | enable_irq(ts->spi->irq); | |
466 | } | |
467 | ||
468 | mutex_unlock(&ts->mutex); | |
469 | } | |
470 | ||
471 | #define SHOW(name) static ssize_t \ | |
472 | name ## _show(struct device *dev, struct device_attribute *attr, char *buf) \ | |
473 | { \ | |
2fd18aba | 474 | struct ad7877 *ts = dev_get_drvdata(dev); \ |
331b78ed MH |
475 | ssize_t v = ad7877_read_adc(ts->spi, \ |
476 | AD7877_READ_CHAN(name)); \ | |
477 | if (v < 0) \ | |
478 | return v; \ | |
479 | return sprintf(buf, "%u\n", (unsigned) v); \ | |
480 | } \ | |
481 | static DEVICE_ATTR(name, S_IRUGO, name ## _show, NULL); | |
482 | ||
483 | SHOW(aux1) | |
484 | SHOW(aux2) | |
485 | SHOW(aux3) | |
486 | SHOW(bat1) | |
487 | SHOW(bat2) | |
488 | SHOW(temp1) | |
489 | SHOW(temp2) | |
490 | ||
491 | static ssize_t ad7877_disable_show(struct device *dev, | |
492 | struct device_attribute *attr, char *buf) | |
493 | { | |
2fd18aba | 494 | struct ad7877 *ts = dev_get_drvdata(dev); |
331b78ed MH |
495 | |
496 | return sprintf(buf, "%u\n", ts->disabled); | |
497 | } | |
498 | ||
499 | static ssize_t ad7877_disable_store(struct device *dev, | |
500 | struct device_attribute *attr, | |
501 | const char *buf, size_t count) | |
502 | { | |
503 | struct ad7877 *ts = dev_get_drvdata(dev); | |
504 | unsigned long val; | |
505 | int error; | |
506 | ||
507 | error = strict_strtoul(buf, 10, &val); | |
508 | if (error) | |
509 | return error; | |
510 | ||
511 | if (val) | |
512 | ad7877_disable(ts); | |
513 | else | |
514 | ad7877_enable(ts); | |
515 | ||
516 | return count; | |
517 | } | |
518 | ||
519 | static DEVICE_ATTR(disable, 0664, ad7877_disable_show, ad7877_disable_store); | |
520 | ||
521 | static ssize_t ad7877_dac_show(struct device *dev, | |
522 | struct device_attribute *attr, char *buf) | |
523 | { | |
2fd18aba | 524 | struct ad7877 *ts = dev_get_drvdata(dev); |
331b78ed MH |
525 | |
526 | return sprintf(buf, "%u\n", ts->dac); | |
527 | } | |
528 | ||
529 | static ssize_t ad7877_dac_store(struct device *dev, | |
530 | struct device_attribute *attr, | |
531 | const char *buf, size_t count) | |
532 | { | |
533 | struct ad7877 *ts = dev_get_drvdata(dev); | |
534 | unsigned long val; | |
535 | int error; | |
536 | ||
537 | error = strict_strtoul(buf, 10, &val); | |
538 | if (error) | |
539 | return error; | |
540 | ||
541 | mutex_lock(&ts->mutex); | |
542 | ts->dac = val & 0xFF; | |
543 | ad7877_write(ts->spi, AD7877_REG_DAC, (ts->dac << 4) | AD7877_DAC_CONF); | |
544 | mutex_unlock(&ts->mutex); | |
545 | ||
546 | return count; | |
547 | } | |
548 | ||
549 | static DEVICE_ATTR(dac, 0664, ad7877_dac_show, ad7877_dac_store); | |
550 | ||
551 | static ssize_t ad7877_gpio3_show(struct device *dev, | |
552 | struct device_attribute *attr, char *buf) | |
553 | { | |
2fd18aba | 554 | struct ad7877 *ts = dev_get_drvdata(dev); |
331b78ed MH |
555 | |
556 | return sprintf(buf, "%u\n", ts->gpio3); | |
557 | } | |
558 | ||
559 | static ssize_t ad7877_gpio3_store(struct device *dev, | |
560 | struct device_attribute *attr, | |
561 | const char *buf, size_t count) | |
562 | { | |
563 | struct ad7877 *ts = dev_get_drvdata(dev); | |
564 | unsigned long val; | |
565 | int error; | |
566 | ||
567 | error = strict_strtoul(buf, 10, &val); | |
568 | if (error) | |
569 | return error; | |
570 | ||
571 | mutex_lock(&ts->mutex); | |
572 | ts->gpio3 = !!val; | |
573 | ad7877_write(ts->spi, AD7877_REG_EXTWRITE, AD7877_EXTW_GPIO_DATA | | |
574 | (ts->gpio4 << 4) | (ts->gpio3 << 5)); | |
575 | mutex_unlock(&ts->mutex); | |
576 | ||
577 | return count; | |
578 | } | |
579 | ||
580 | static DEVICE_ATTR(gpio3, 0664, ad7877_gpio3_show, ad7877_gpio3_store); | |
581 | ||
582 | static ssize_t ad7877_gpio4_show(struct device *dev, | |
583 | struct device_attribute *attr, char *buf) | |
584 | { | |
2fd18aba | 585 | struct ad7877 *ts = dev_get_drvdata(dev); |
331b78ed MH |
586 | |
587 | return sprintf(buf, "%u\n", ts->gpio4); | |
588 | } | |
589 | ||
590 | static ssize_t ad7877_gpio4_store(struct device *dev, | |
591 | struct device_attribute *attr, | |
592 | const char *buf, size_t count) | |
593 | { | |
594 | struct ad7877 *ts = dev_get_drvdata(dev); | |
595 | unsigned long val; | |
596 | int error; | |
597 | ||
598 | error = strict_strtoul(buf, 10, &val); | |
599 | if (error) | |
600 | return error; | |
601 | ||
602 | mutex_lock(&ts->mutex); | |
603 | ts->gpio4 = !!val; | |
604 | ad7877_write(ts->spi, AD7877_REG_EXTWRITE, AD7877_EXTW_GPIO_DATA | | |
605 | (ts->gpio4 << 4) | (ts->gpio3 << 5)); | |
606 | mutex_unlock(&ts->mutex); | |
607 | ||
608 | return count; | |
609 | } | |
610 | ||
611 | static DEVICE_ATTR(gpio4, 0664, ad7877_gpio4_show, ad7877_gpio4_store); | |
612 | ||
613 | static struct attribute *ad7877_attributes[] = { | |
614 | &dev_attr_temp1.attr, | |
615 | &dev_attr_temp2.attr, | |
616 | &dev_attr_aux1.attr, | |
617 | &dev_attr_aux2.attr, | |
2fd18aba | 618 | &dev_attr_aux3.attr, |
331b78ed MH |
619 | &dev_attr_bat1.attr, |
620 | &dev_attr_bat2.attr, | |
621 | &dev_attr_disable.attr, | |
622 | &dev_attr_dac.attr, | |
2fd18aba | 623 | &dev_attr_gpio3.attr, |
331b78ed MH |
624 | &dev_attr_gpio4.attr, |
625 | NULL | |
626 | }; | |
627 | ||
2fd18aba DT |
628 | static mode_t ad7877_attr_is_visible(struct kobject *kobj, |
629 | struct attribute *attr, int n) | |
630 | { | |
631 | mode_t mode = attr->mode; | |
632 | ||
633 | if (attr == &dev_attr_aux3.attr) { | |
634 | if (gpio3) | |
635 | mode = 0; | |
636 | } else if (attr == &dev_attr_gpio3.attr) { | |
637 | if (!gpio3) | |
638 | mode = 0; | |
639 | } | |
640 | ||
641 | return mode; | |
642 | } | |
643 | ||
331b78ed | 644 | static const struct attribute_group ad7877_attr_group = { |
2fd18aba DT |
645 | .is_visible = ad7877_attr_is_visible, |
646 | .attrs = ad7877_attributes, | |
331b78ed MH |
647 | }; |
648 | ||
649 | static void ad7877_setup_ts_def_msg(struct spi_device *spi, struct ad7877 *ts) | |
650 | { | |
651 | struct spi_message *m; | |
652 | int i; | |
653 | ||
654 | ts->cmd_crtl2 = AD7877_WRITEADD(AD7877_REG_CTRL2) | | |
655 | AD7877_POL(ts->stopacq_polarity) | | |
656 | AD7877_AVG(ts->averaging) | AD7877_PM(1) | | |
657 | AD7877_TMR(ts->pen_down_acc_interval) | | |
658 | AD7877_ACQ(ts->acquisition_time) | | |
659 | AD7877_FCD(ts->first_conversion_delay); | |
660 | ||
661 | ad7877_write(spi, AD7877_REG_CTRL2, ts->cmd_crtl2); | |
662 | ||
663 | ts->cmd_crtl1 = AD7877_WRITEADD(AD7877_REG_CTRL1) | | |
664 | AD7877_READADD(AD7877_REG_XPLUS-1) | | |
665 | AD7877_MODE_SEQ1 | AD7877_DFR; | |
666 | ||
667 | ad7877_write(spi, AD7877_REG_CTRL1, ts->cmd_crtl1); | |
668 | ||
669 | ts->cmd_dummy = 0; | |
670 | ||
671 | m = &ts->msg; | |
672 | ||
673 | spi_message_init(m); | |
674 | ||
675 | m->complete = ad7877_callback; | |
676 | m->context = ts; | |
677 | ||
678 | ts->xfer[0].tx_buf = &ts->cmd_crtl1; | |
679 | ts->xfer[0].len = 2; | |
e92c27fb | 680 | ts->xfer[0].cs_change = 1; |
331b78ed MH |
681 | |
682 | spi_message_add_tail(&ts->xfer[0], m); | |
683 | ||
684 | ts->xfer[1].tx_buf = &ts->cmd_dummy; /* Send ZERO */ | |
685 | ts->xfer[1].len = 2; | |
e92c27fb | 686 | ts->xfer[1].cs_change = 1; |
331b78ed MH |
687 | |
688 | spi_message_add_tail(&ts->xfer[1], m); | |
689 | ||
e92c27fb | 690 | for (i = 0; i < AD7877_NR_SENSE; i++) { |
331b78ed MH |
691 | ts->xfer[i + 2].rx_buf = &ts->conversion_data[AD7877_SEQ_YPOS + i]; |
692 | ts->xfer[i + 2].len = 2; | |
e92c27fb MH |
693 | if (i < (AD7877_NR_SENSE - 1)) |
694 | ts->xfer[i + 2].cs_change = 1; | |
331b78ed MH |
695 | spi_message_add_tail(&ts->xfer[i + 2], m); |
696 | } | |
697 | } | |
698 | ||
699 | static int __devinit ad7877_probe(struct spi_device *spi) | |
700 | { | |
701 | struct ad7877 *ts; | |
702 | struct input_dev *input_dev; | |
703 | struct ad7877_platform_data *pdata = spi->dev.platform_data; | |
704 | int err; | |
705 | u16 verify; | |
706 | ||
707 | if (!spi->irq) { | |
708 | dev_dbg(&spi->dev, "no IRQ?\n"); | |
709 | return -ENODEV; | |
710 | } | |
711 | ||
712 | if (!pdata) { | |
713 | dev_dbg(&spi->dev, "no platform data?\n"); | |
714 | return -ENODEV; | |
715 | } | |
716 | ||
717 | /* don't exceed max specified SPI CLK frequency */ | |
718 | if (spi->max_speed_hz > MAX_SPI_FREQ_HZ) { | |
719 | dev_dbg(&spi->dev, "SPI CLK %d Hz?\n",spi->max_speed_hz); | |
720 | return -EINVAL; | |
721 | } | |
722 | ||
cd9b6fdf OS |
723 | spi->bits_per_word = 16; |
724 | err = spi_setup(spi); | |
725 | if (err) { | |
726 | dev_dbg(&spi->dev, "spi master doesn't support 16 bits/word\n"); | |
727 | return err; | |
728 | } | |
729 | ||
331b78ed MH |
730 | ts = kzalloc(sizeof(struct ad7877), GFP_KERNEL); |
731 | input_dev = input_allocate_device(); | |
732 | if (!ts || !input_dev) { | |
733 | err = -ENOMEM; | |
734 | goto err_free_mem; | |
735 | } | |
736 | ||
737 | dev_set_drvdata(&spi->dev, ts); | |
738 | ts->spi = spi; | |
739 | ts->input = input_dev; | |
740 | ||
741 | setup_timer(&ts->timer, ad7877_timer, (unsigned long) ts); | |
742 | mutex_init(&ts->mutex); | |
743 | spin_lock_init(&ts->lock); | |
744 | ||
745 | ts->model = pdata->model ? : 7877; | |
746 | ts->vref_delay_usecs = pdata->vref_delay_usecs ? : 100; | |
747 | ts->x_plate_ohms = pdata->x_plate_ohms ? : 400; | |
748 | ts->pressure_max = pdata->pressure_max ? : ~0; | |
749 | ||
750 | ts->stopacq_polarity = pdata->stopacq_polarity; | |
751 | ts->first_conversion_delay = pdata->first_conversion_delay; | |
752 | ts->acquisition_time = pdata->acquisition_time; | |
753 | ts->averaging = pdata->averaging; | |
754 | ts->pen_down_acc_interval = pdata->pen_down_acc_interval; | |
755 | ||
756 | snprintf(ts->phys, sizeof(ts->phys), "%s/input0", dev_name(&spi->dev)); | |
757 | ||
758 | input_dev->name = "AD7877 Touchscreen"; | |
759 | input_dev->phys = ts->phys; | |
760 | input_dev->dev.parent = &spi->dev; | |
761 | ||
47026b25 MH |
762 | __set_bit(EV_KEY, input_dev->evbit); |
763 | __set_bit(BTN_TOUCH, input_dev->keybit); | |
331b78ed MH |
764 | __set_bit(EV_ABS, input_dev->evbit); |
765 | __set_bit(ABS_X, input_dev->absbit); | |
766 | __set_bit(ABS_Y, input_dev->absbit); | |
767 | __set_bit(ABS_PRESSURE, input_dev->absbit); | |
768 | ||
769 | input_set_abs_params(input_dev, ABS_X, | |
770 | pdata->x_min ? : 0, | |
771 | pdata->x_max ? : MAX_12BIT, | |
772 | 0, 0); | |
773 | input_set_abs_params(input_dev, ABS_Y, | |
774 | pdata->y_min ? : 0, | |
775 | pdata->y_max ? : MAX_12BIT, | |
776 | 0, 0); | |
777 | input_set_abs_params(input_dev, ABS_PRESSURE, | |
778 | pdata->pressure_min, pdata->pressure_max, 0, 0); | |
779 | ||
780 | ad7877_write(spi, AD7877_REG_SEQ1, AD7877_MM_SEQUENCE); | |
781 | ||
782 | verify = ad7877_read(spi, AD7877_REG_SEQ1); | |
783 | ||
784 | if (verify != AD7877_MM_SEQUENCE){ | |
785 | dev_err(&spi->dev, "%s: Failed to probe %s\n", | |
786 | dev_name(&spi->dev), input_dev->name); | |
787 | err = -ENODEV; | |
788 | goto err_free_mem; | |
789 | } | |
790 | ||
791 | if (gpio3) | |
792 | ad7877_write(spi, AD7877_REG_EXTWRITE, AD7877_EXTW_GPIO_3_CONF); | |
793 | ||
794 | ad7877_setup_ts_def_msg(spi, ts); | |
795 | ||
796 | /* Request AD7877 /DAV GPIO interrupt */ | |
797 | ||
0bc69ce6 MH |
798 | err = request_irq(spi->irq, ad7877_irq, IRQF_TRIGGER_FALLING, |
799 | spi->dev.driver->name, ts); | |
331b78ed MH |
800 | if (err) { |
801 | dev_dbg(&spi->dev, "irq %d busy?\n", spi->irq); | |
802 | goto err_free_mem; | |
803 | } | |
804 | ||
805 | err = sysfs_create_group(&spi->dev.kobj, &ad7877_attr_group); | |
806 | if (err) | |
807 | goto err_free_irq; | |
808 | ||
331b78ed MH |
809 | err = input_register_device(input_dev); |
810 | if (err) | |
2fd18aba | 811 | goto err_remove_attr_group; |
331b78ed MH |
812 | |
813 | return 0; | |
814 | ||
331b78ed MH |
815 | err_remove_attr_group: |
816 | sysfs_remove_group(&spi->dev.kobj, &ad7877_attr_group); | |
817 | err_free_irq: | |
818 | free_irq(spi->irq, ts); | |
819 | err_free_mem: | |
820 | input_free_device(input_dev); | |
821 | kfree(ts); | |
822 | dev_set_drvdata(&spi->dev, NULL); | |
823 | return err; | |
824 | } | |
825 | ||
826 | static int __devexit ad7877_remove(struct spi_device *spi) | |
827 | { | |
2fd18aba | 828 | struct ad7877 *ts = dev_get_drvdata(&spi->dev); |
331b78ed MH |
829 | |
830 | sysfs_remove_group(&spi->dev.kobj, &ad7877_attr_group); | |
331b78ed MH |
831 | |
832 | ad7877_disable(ts); | |
833 | free_irq(ts->spi->irq, ts); | |
834 | ||
835 | input_unregister_device(ts->input); | |
836 | kfree(ts); | |
837 | ||
838 | dev_dbg(&spi->dev, "unregistered touchscreen\n"); | |
839 | dev_set_drvdata(&spi->dev, NULL); | |
840 | ||
841 | return 0; | |
842 | } | |
843 | ||
844 | #ifdef CONFIG_PM | |
845 | static int ad7877_suspend(struct spi_device *spi, pm_message_t message) | |
846 | { | |
847 | struct ad7877 *ts = dev_get_drvdata(&spi->dev); | |
848 | ||
849 | ad7877_disable(ts); | |
850 | ||
851 | return 0; | |
852 | } | |
853 | ||
854 | static int ad7877_resume(struct spi_device *spi) | |
855 | { | |
856 | struct ad7877 *ts = dev_get_drvdata(&spi->dev); | |
857 | ||
858 | ad7877_enable(ts); | |
859 | ||
860 | return 0; | |
861 | } | |
862 | #else | |
863 | #define ad7877_suspend NULL | |
864 | #define ad7877_resume NULL | |
865 | #endif | |
866 | ||
867 | static struct spi_driver ad7877_driver = { | |
868 | .driver = { | |
869 | .name = "ad7877", | |
870 | .bus = &spi_bus_type, | |
871 | .owner = THIS_MODULE, | |
872 | }, | |
873 | .probe = ad7877_probe, | |
874 | .remove = __devexit_p(ad7877_remove), | |
875 | .suspend = ad7877_suspend, | |
876 | .resume = ad7877_resume, | |
877 | }; | |
878 | ||
879 | static int __init ad7877_init(void) | |
880 | { | |
881 | return spi_register_driver(&ad7877_driver); | |
882 | } | |
883 | module_init(ad7877_init); | |
884 | ||
885 | static void __exit ad7877_exit(void) | |
886 | { | |
887 | spi_unregister_driver(&ad7877_driver); | |
888 | } | |
889 | module_exit(ad7877_exit); | |
890 | ||
891 | MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>"); | |
892 | MODULE_DESCRIPTION("AD7877 touchscreen Driver"); | |
893 | MODULE_LICENSE("GPL"); | |
e0626e38 | 894 | MODULE_ALIAS("spi:ad7877"); |