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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; | |
b534422b DT |
194 | bool disabled; /* P: mutex */ |
195 | bool gpio3; /* P: mutex */ | |
196 | bool gpio4; /* P: mutex */ | |
331b78ed MH |
197 | |
198 | spinlock_t lock; | |
199 | struct timer_list timer; /* P: lock */ | |
3843384a OS |
200 | |
201 | /* | |
202 | * DMA (thus cache coherency maintenance) requires the | |
203 | * transfer buffers to live in their own cache lines. | |
204 | */ | |
205 | u16 conversion_data[AD7877_NR_SENSE] ____cacheline_aligned; | |
331b78ed MH |
206 | }; |
207 | ||
2fd18aba DT |
208 | static bool gpio3; |
209 | module_param(gpio3, bool, 0); | |
331b78ed MH |
210 | MODULE_PARM_DESC(gpio3, "If gpio3 is set to 1 AUX3 acts as GPIO3"); |
211 | ||
212 | /* | |
213 | * ad7877_read/write are only used for initial setup and for sysfs controls. | |
214 | * The main traffic is done using spi_async() in the interrupt handler. | |
215 | */ | |
216 | ||
217 | static int ad7877_read(struct spi_device *spi, u16 reg) | |
218 | { | |
219 | struct ser_req *req; | |
220 | int status, ret; | |
221 | ||
222 | req = kzalloc(sizeof *req, GFP_KERNEL); | |
223 | if (!req) | |
224 | return -ENOMEM; | |
225 | ||
226 | spi_message_init(&req->msg); | |
227 | ||
228 | req->command = (u16) (AD7877_WRITEADD(AD7877_REG_CTRL1) | | |
229 | AD7877_READADD(reg)); | |
230 | req->xfer[0].tx_buf = &req->command; | |
231 | req->xfer[0].len = 2; | |
e92c27fb | 232 | req->xfer[0].cs_change = 1; |
331b78ed MH |
233 | |
234 | req->xfer[1].rx_buf = &req->sample; | |
235 | req->xfer[1].len = 2; | |
236 | ||
237 | spi_message_add_tail(&req->xfer[0], &req->msg); | |
238 | spi_message_add_tail(&req->xfer[1], &req->msg); | |
239 | ||
240 | status = spi_sync(spi, &req->msg); | |
241 | ret = status ? : req->sample; | |
242 | ||
243 | kfree(req); | |
244 | ||
245 | return ret; | |
246 | } | |
247 | ||
248 | static int ad7877_write(struct spi_device *spi, u16 reg, u16 val) | |
249 | { | |
250 | struct ser_req *req; | |
251 | int status; | |
252 | ||
253 | req = kzalloc(sizeof *req, GFP_KERNEL); | |
254 | if (!req) | |
255 | return -ENOMEM; | |
256 | ||
257 | spi_message_init(&req->msg); | |
258 | ||
259 | req->command = (u16) (AD7877_WRITEADD(reg) | (val & MAX_12BIT)); | |
260 | req->xfer[0].tx_buf = &req->command; | |
261 | req->xfer[0].len = 2; | |
262 | ||
263 | spi_message_add_tail(&req->xfer[0], &req->msg); | |
264 | ||
265 | status = spi_sync(spi, &req->msg); | |
266 | ||
267 | kfree(req); | |
268 | ||
269 | return status; | |
270 | } | |
271 | ||
272 | static int ad7877_read_adc(struct spi_device *spi, unsigned command) | |
273 | { | |
274 | struct ad7877 *ts = dev_get_drvdata(&spi->dev); | |
275 | struct ser_req *req; | |
276 | int status; | |
277 | int sample; | |
278 | int i; | |
279 | ||
280 | req = kzalloc(sizeof *req, GFP_KERNEL); | |
281 | if (!req) | |
282 | return -ENOMEM; | |
283 | ||
284 | spi_message_init(&req->msg); | |
285 | ||
286 | /* activate reference, so it has time to settle; */ | |
287 | req->ref_on = AD7877_WRITEADD(AD7877_REG_CTRL2) | | |
288 | AD7877_POL(ts->stopacq_polarity) | | |
289 | AD7877_AVG(0) | AD7877_PM(2) | AD7877_TMR(0) | | |
290 | AD7877_ACQ(ts->acquisition_time) | AD7877_FCD(0); | |
291 | ||
292 | req->reset = AD7877_WRITEADD(AD7877_REG_CTRL1) | AD7877_MODE_NOC; | |
293 | ||
294 | req->command = (u16) command; | |
295 | ||
296 | req->xfer[0].tx_buf = &req->reset; | |
297 | req->xfer[0].len = 2; | |
e92c27fb | 298 | req->xfer[0].cs_change = 1; |
331b78ed MH |
299 | |
300 | req->xfer[1].tx_buf = &req->ref_on; | |
301 | req->xfer[1].len = 2; | |
302 | req->xfer[1].delay_usecs = ts->vref_delay_usecs; | |
e92c27fb | 303 | req->xfer[1].cs_change = 1; |
331b78ed MH |
304 | |
305 | req->xfer[2].tx_buf = &req->command; | |
306 | req->xfer[2].len = 2; | |
307 | req->xfer[2].delay_usecs = ts->vref_delay_usecs; | |
e92c27fb | 308 | req->xfer[2].cs_change = 1; |
331b78ed MH |
309 | |
310 | req->xfer[3].rx_buf = &req->sample; | |
311 | req->xfer[3].len = 2; | |
e92c27fb | 312 | req->xfer[3].cs_change = 1; |
331b78ed MH |
313 | |
314 | req->xfer[4].tx_buf = &ts->cmd_crtl2; /*REF OFF*/ | |
315 | req->xfer[4].len = 2; | |
e92c27fb | 316 | req->xfer[4].cs_change = 1; |
331b78ed MH |
317 | |
318 | req->xfer[5].tx_buf = &ts->cmd_crtl1; /*DEFAULT*/ | |
319 | req->xfer[5].len = 2; | |
320 | ||
321 | /* group all the transfers together, so we can't interfere with | |
322 | * reading touchscreen state; disable penirq while sampling | |
323 | */ | |
324 | for (i = 0; i < 6; i++) | |
325 | spi_message_add_tail(&req->xfer[i], &req->msg); | |
326 | ||
327 | status = spi_sync(spi, &req->msg); | |
328 | sample = req->sample; | |
329 | ||
330 | kfree(req); | |
331 | ||
332 | return status ? : sample; | |
333 | } | |
334 | ||
b534422b | 335 | static int ad7877_process_data(struct ad7877 *ts) |
331b78ed MH |
336 | { |
337 | struct input_dev *input_dev = ts->input; | |
338 | unsigned Rt; | |
339 | u16 x, y, z1, z2; | |
340 | ||
341 | x = ts->conversion_data[AD7877_SEQ_XPOS] & MAX_12BIT; | |
342 | y = ts->conversion_data[AD7877_SEQ_YPOS] & MAX_12BIT; | |
343 | z1 = ts->conversion_data[AD7877_SEQ_Z1] & MAX_12BIT; | |
344 | z2 = ts->conversion_data[AD7877_SEQ_Z2] & MAX_12BIT; | |
345 | ||
346 | /* | |
347 | * The samples processed here are already preprocessed by the AD7877. | |
348 | * The preprocessing function consists of an averaging filter. | |
349 | * The combination of 'first conversion delay' and averaging provides a robust solution, | |
350 | * discarding the spurious noise in the signal and keeping only the data of interest. | |
351 | * The size of the averaging filter is programmable. (dev.platform_data, see linux/spi/ad7877.h) | |
352 | * Other user-programmable conversion controls include variable acquisition time, | |
353 | * and first conversion delay. Up to 16 averages can be taken per conversion. | |
354 | */ | |
355 | ||
356 | if (likely(x && z1)) { | |
357 | /* compute touch pressure resistance using equation #1 */ | |
358 | Rt = (z2 - z1) * x * ts->x_plate_ohms; | |
359 | Rt /= z1; | |
360 | Rt = (Rt + 2047) >> 12; | |
361 | ||
1d02ad43 MH |
362 | /* |
363 | * Sample found inconsistent, pressure is beyond | |
364 | * the maximum. Don't report it to user space. | |
365 | */ | |
366 | if (Rt > ts->pressure_max) | |
367 | return -EINVAL; | |
368 | ||
47026b25 MH |
369 | if (!timer_pending(&ts->timer)) |
370 | input_report_key(input_dev, BTN_TOUCH, 1); | |
371 | ||
331b78ed MH |
372 | input_report_abs(input_dev, ABS_X, x); |
373 | input_report_abs(input_dev, ABS_Y, y); | |
374 | input_report_abs(input_dev, ABS_PRESSURE, Rt); | |
375 | input_sync(input_dev); | |
b534422b | 376 | |
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; | |
b534422b | 395 | unsigned long flags; |
331b78ed | 396 | |
b534422b | 397 | spin_lock_irqsave(&ts->lock, flags); |
331b78ed | 398 | ad7877_ts_event_release(ts); |
b534422b | 399 | spin_unlock_irqrestore(&ts->lock, flags); |
331b78ed MH |
400 | } |
401 | ||
402 | static irqreturn_t ad7877_irq(int irq, void *handle) | |
403 | { | |
404 | struct ad7877 *ts = handle; | |
405 | unsigned long flags; | |
b534422b | 406 | int error; |
331b78ed | 407 | |
b534422b DT |
408 | error = spi_sync(ts->spi, &ts->msg); |
409 | if (error) { | |
410 | dev_err(&ts->spi->dev, "spi_sync --> %d\n", error); | |
411 | goto out; | |
412 | } | |
331b78ed MH |
413 | |
414 | spin_lock_irqsave(&ts->lock, flags); | |
b534422b DT |
415 | error = ad7877_process_data(ts); |
416 | if (!error) | |
417 | mod_timer(&ts->timer, jiffies + TS_PEN_UP_TIMEOUT); | |
331b78ed MH |
418 | spin_unlock_irqrestore(&ts->lock, flags); |
419 | ||
b534422b | 420 | out: |
331b78ed MH |
421 | return IRQ_HANDLED; |
422 | } | |
423 | ||
331b78ed MH |
424 | static void ad7877_disable(struct ad7877 *ts) |
425 | { | |
426 | mutex_lock(&ts->mutex); | |
427 | ||
428 | if (!ts->disabled) { | |
b534422b | 429 | ts->disabled = true; |
331b78ed MH |
430 | disable_irq(ts->spi->irq); |
431 | ||
331b78ed MH |
432 | if (del_timer_sync(&ts->timer)) |
433 | ad7877_ts_event_release(ts); | |
434 | } | |
435 | ||
b534422b DT |
436 | /* |
437 | * We know the chip's in lowpower mode since we always | |
331b78ed MH |
438 | * leave it that way after every request |
439 | */ | |
440 | ||
441 | mutex_unlock(&ts->mutex); | |
442 | } | |
443 | ||
444 | static void ad7877_enable(struct ad7877 *ts) | |
445 | { | |
446 | mutex_lock(&ts->mutex); | |
447 | ||
448 | if (ts->disabled) { | |
b534422b | 449 | ts->disabled = false; |
331b78ed MH |
450 | enable_irq(ts->spi->irq); |
451 | } | |
452 | ||
453 | mutex_unlock(&ts->mutex); | |
454 | } | |
455 | ||
456 | #define SHOW(name) static ssize_t \ | |
457 | name ## _show(struct device *dev, struct device_attribute *attr, char *buf) \ | |
458 | { \ | |
2fd18aba | 459 | struct ad7877 *ts = dev_get_drvdata(dev); \ |
331b78ed MH |
460 | ssize_t v = ad7877_read_adc(ts->spi, \ |
461 | AD7877_READ_CHAN(name)); \ | |
462 | if (v < 0) \ | |
463 | return v; \ | |
464 | return sprintf(buf, "%u\n", (unsigned) v); \ | |
465 | } \ | |
466 | static DEVICE_ATTR(name, S_IRUGO, name ## _show, NULL); | |
467 | ||
468 | SHOW(aux1) | |
469 | SHOW(aux2) | |
470 | SHOW(aux3) | |
471 | SHOW(bat1) | |
472 | SHOW(bat2) | |
473 | SHOW(temp1) | |
474 | SHOW(temp2) | |
475 | ||
476 | static ssize_t ad7877_disable_show(struct device *dev, | |
477 | struct device_attribute *attr, char *buf) | |
478 | { | |
2fd18aba | 479 | struct ad7877 *ts = dev_get_drvdata(dev); |
331b78ed MH |
480 | |
481 | return sprintf(buf, "%u\n", ts->disabled); | |
482 | } | |
483 | ||
484 | static ssize_t ad7877_disable_store(struct device *dev, | |
485 | struct device_attribute *attr, | |
486 | const char *buf, size_t count) | |
487 | { | |
488 | struct ad7877 *ts = dev_get_drvdata(dev); | |
489 | unsigned long val; | |
490 | int error; | |
491 | ||
492 | error = strict_strtoul(buf, 10, &val); | |
493 | if (error) | |
494 | return error; | |
495 | ||
496 | if (val) | |
497 | ad7877_disable(ts); | |
498 | else | |
499 | ad7877_enable(ts); | |
500 | ||
501 | return count; | |
502 | } | |
503 | ||
504 | static DEVICE_ATTR(disable, 0664, ad7877_disable_show, ad7877_disable_store); | |
505 | ||
506 | static ssize_t ad7877_dac_show(struct device *dev, | |
507 | struct device_attribute *attr, char *buf) | |
508 | { | |
2fd18aba | 509 | struct ad7877 *ts = dev_get_drvdata(dev); |
331b78ed MH |
510 | |
511 | return sprintf(buf, "%u\n", ts->dac); | |
512 | } | |
513 | ||
514 | static ssize_t ad7877_dac_store(struct device *dev, | |
515 | struct device_attribute *attr, | |
516 | const char *buf, size_t count) | |
517 | { | |
518 | struct ad7877 *ts = dev_get_drvdata(dev); | |
519 | unsigned long val; | |
520 | int error; | |
521 | ||
522 | error = strict_strtoul(buf, 10, &val); | |
523 | if (error) | |
524 | return error; | |
525 | ||
526 | mutex_lock(&ts->mutex); | |
527 | ts->dac = val & 0xFF; | |
528 | ad7877_write(ts->spi, AD7877_REG_DAC, (ts->dac << 4) | AD7877_DAC_CONF); | |
529 | mutex_unlock(&ts->mutex); | |
530 | ||
531 | return count; | |
532 | } | |
533 | ||
534 | static DEVICE_ATTR(dac, 0664, ad7877_dac_show, ad7877_dac_store); | |
535 | ||
536 | static ssize_t ad7877_gpio3_show(struct device *dev, | |
537 | struct device_attribute *attr, char *buf) | |
538 | { | |
2fd18aba | 539 | struct ad7877 *ts = dev_get_drvdata(dev); |
331b78ed MH |
540 | |
541 | return sprintf(buf, "%u\n", ts->gpio3); | |
542 | } | |
543 | ||
544 | static ssize_t ad7877_gpio3_store(struct device *dev, | |
545 | struct device_attribute *attr, | |
546 | const char *buf, size_t count) | |
547 | { | |
548 | struct ad7877 *ts = dev_get_drvdata(dev); | |
549 | unsigned long val; | |
550 | int error; | |
551 | ||
552 | error = strict_strtoul(buf, 10, &val); | |
553 | if (error) | |
554 | return error; | |
555 | ||
556 | mutex_lock(&ts->mutex); | |
557 | ts->gpio3 = !!val; | |
558 | ad7877_write(ts->spi, AD7877_REG_EXTWRITE, AD7877_EXTW_GPIO_DATA | | |
559 | (ts->gpio4 << 4) | (ts->gpio3 << 5)); | |
560 | mutex_unlock(&ts->mutex); | |
561 | ||
562 | return count; | |
563 | } | |
564 | ||
565 | static DEVICE_ATTR(gpio3, 0664, ad7877_gpio3_show, ad7877_gpio3_store); | |
566 | ||
567 | static ssize_t ad7877_gpio4_show(struct device *dev, | |
568 | struct device_attribute *attr, char *buf) | |
569 | { | |
2fd18aba | 570 | struct ad7877 *ts = dev_get_drvdata(dev); |
331b78ed MH |
571 | |
572 | return sprintf(buf, "%u\n", ts->gpio4); | |
573 | } | |
574 | ||
575 | static ssize_t ad7877_gpio4_store(struct device *dev, | |
576 | struct device_attribute *attr, | |
577 | const char *buf, size_t count) | |
578 | { | |
579 | struct ad7877 *ts = dev_get_drvdata(dev); | |
580 | unsigned long val; | |
581 | int error; | |
582 | ||
583 | error = strict_strtoul(buf, 10, &val); | |
584 | if (error) | |
585 | return error; | |
586 | ||
587 | mutex_lock(&ts->mutex); | |
588 | ts->gpio4 = !!val; | |
589 | ad7877_write(ts->spi, AD7877_REG_EXTWRITE, AD7877_EXTW_GPIO_DATA | | |
590 | (ts->gpio4 << 4) | (ts->gpio3 << 5)); | |
591 | mutex_unlock(&ts->mutex); | |
592 | ||
593 | return count; | |
594 | } | |
595 | ||
596 | static DEVICE_ATTR(gpio4, 0664, ad7877_gpio4_show, ad7877_gpio4_store); | |
597 | ||
598 | static struct attribute *ad7877_attributes[] = { | |
599 | &dev_attr_temp1.attr, | |
600 | &dev_attr_temp2.attr, | |
601 | &dev_attr_aux1.attr, | |
602 | &dev_attr_aux2.attr, | |
2fd18aba | 603 | &dev_attr_aux3.attr, |
331b78ed MH |
604 | &dev_attr_bat1.attr, |
605 | &dev_attr_bat2.attr, | |
606 | &dev_attr_disable.attr, | |
607 | &dev_attr_dac.attr, | |
2fd18aba | 608 | &dev_attr_gpio3.attr, |
331b78ed MH |
609 | &dev_attr_gpio4.attr, |
610 | NULL | |
611 | }; | |
612 | ||
2fd18aba DT |
613 | static mode_t ad7877_attr_is_visible(struct kobject *kobj, |
614 | struct attribute *attr, int n) | |
615 | { | |
616 | mode_t mode = attr->mode; | |
617 | ||
618 | if (attr == &dev_attr_aux3.attr) { | |
619 | if (gpio3) | |
620 | mode = 0; | |
621 | } else if (attr == &dev_attr_gpio3.attr) { | |
622 | if (!gpio3) | |
623 | mode = 0; | |
624 | } | |
625 | ||
626 | return mode; | |
627 | } | |
628 | ||
331b78ed | 629 | static const struct attribute_group ad7877_attr_group = { |
2fd18aba DT |
630 | .is_visible = ad7877_attr_is_visible, |
631 | .attrs = ad7877_attributes, | |
331b78ed MH |
632 | }; |
633 | ||
634 | static void ad7877_setup_ts_def_msg(struct spi_device *spi, struct ad7877 *ts) | |
635 | { | |
636 | struct spi_message *m; | |
637 | int i; | |
638 | ||
639 | ts->cmd_crtl2 = AD7877_WRITEADD(AD7877_REG_CTRL2) | | |
640 | AD7877_POL(ts->stopacq_polarity) | | |
641 | AD7877_AVG(ts->averaging) | AD7877_PM(1) | | |
642 | AD7877_TMR(ts->pen_down_acc_interval) | | |
643 | AD7877_ACQ(ts->acquisition_time) | | |
644 | AD7877_FCD(ts->first_conversion_delay); | |
645 | ||
646 | ad7877_write(spi, AD7877_REG_CTRL2, ts->cmd_crtl2); | |
647 | ||
648 | ts->cmd_crtl1 = AD7877_WRITEADD(AD7877_REG_CTRL1) | | |
649 | AD7877_READADD(AD7877_REG_XPLUS-1) | | |
650 | AD7877_MODE_SEQ1 | AD7877_DFR; | |
651 | ||
652 | ad7877_write(spi, AD7877_REG_CTRL1, ts->cmd_crtl1); | |
653 | ||
654 | ts->cmd_dummy = 0; | |
655 | ||
656 | m = &ts->msg; | |
657 | ||
658 | spi_message_init(m); | |
659 | ||
331b78ed MH |
660 | m->context = ts; |
661 | ||
662 | ts->xfer[0].tx_buf = &ts->cmd_crtl1; | |
663 | ts->xfer[0].len = 2; | |
e92c27fb | 664 | ts->xfer[0].cs_change = 1; |
331b78ed MH |
665 | |
666 | spi_message_add_tail(&ts->xfer[0], m); | |
667 | ||
668 | ts->xfer[1].tx_buf = &ts->cmd_dummy; /* Send ZERO */ | |
669 | ts->xfer[1].len = 2; | |
e92c27fb | 670 | ts->xfer[1].cs_change = 1; |
331b78ed MH |
671 | |
672 | spi_message_add_tail(&ts->xfer[1], m); | |
673 | ||
e92c27fb | 674 | for (i = 0; i < AD7877_NR_SENSE; i++) { |
331b78ed MH |
675 | ts->xfer[i + 2].rx_buf = &ts->conversion_data[AD7877_SEQ_YPOS + i]; |
676 | ts->xfer[i + 2].len = 2; | |
e92c27fb MH |
677 | if (i < (AD7877_NR_SENSE - 1)) |
678 | ts->xfer[i + 2].cs_change = 1; | |
331b78ed MH |
679 | spi_message_add_tail(&ts->xfer[i + 2], m); |
680 | } | |
681 | } | |
682 | ||
683 | static int __devinit ad7877_probe(struct spi_device *spi) | |
684 | { | |
685 | struct ad7877 *ts; | |
686 | struct input_dev *input_dev; | |
687 | struct ad7877_platform_data *pdata = spi->dev.platform_data; | |
688 | int err; | |
689 | u16 verify; | |
690 | ||
691 | if (!spi->irq) { | |
692 | dev_dbg(&spi->dev, "no IRQ?\n"); | |
693 | return -ENODEV; | |
694 | } | |
695 | ||
696 | if (!pdata) { | |
697 | dev_dbg(&spi->dev, "no platform data?\n"); | |
698 | return -ENODEV; | |
699 | } | |
700 | ||
701 | /* don't exceed max specified SPI CLK frequency */ | |
702 | if (spi->max_speed_hz > MAX_SPI_FREQ_HZ) { | |
703 | dev_dbg(&spi->dev, "SPI CLK %d Hz?\n",spi->max_speed_hz); | |
704 | return -EINVAL; | |
705 | } | |
706 | ||
cd9b6fdf OS |
707 | spi->bits_per_word = 16; |
708 | err = spi_setup(spi); | |
709 | if (err) { | |
710 | dev_dbg(&spi->dev, "spi master doesn't support 16 bits/word\n"); | |
711 | return err; | |
712 | } | |
713 | ||
331b78ed MH |
714 | ts = kzalloc(sizeof(struct ad7877), GFP_KERNEL); |
715 | input_dev = input_allocate_device(); | |
716 | if (!ts || !input_dev) { | |
717 | err = -ENOMEM; | |
718 | goto err_free_mem; | |
719 | } | |
720 | ||
721 | dev_set_drvdata(&spi->dev, ts); | |
722 | ts->spi = spi; | |
723 | ts->input = input_dev; | |
724 | ||
725 | setup_timer(&ts->timer, ad7877_timer, (unsigned long) ts); | |
726 | mutex_init(&ts->mutex); | |
727 | spin_lock_init(&ts->lock); | |
728 | ||
729 | ts->model = pdata->model ? : 7877; | |
730 | ts->vref_delay_usecs = pdata->vref_delay_usecs ? : 100; | |
731 | ts->x_plate_ohms = pdata->x_plate_ohms ? : 400; | |
732 | ts->pressure_max = pdata->pressure_max ? : ~0; | |
733 | ||
734 | ts->stopacq_polarity = pdata->stopacq_polarity; | |
735 | ts->first_conversion_delay = pdata->first_conversion_delay; | |
736 | ts->acquisition_time = pdata->acquisition_time; | |
737 | ts->averaging = pdata->averaging; | |
738 | ts->pen_down_acc_interval = pdata->pen_down_acc_interval; | |
739 | ||
740 | snprintf(ts->phys, sizeof(ts->phys), "%s/input0", dev_name(&spi->dev)); | |
741 | ||
742 | input_dev->name = "AD7877 Touchscreen"; | |
743 | input_dev->phys = ts->phys; | |
744 | input_dev->dev.parent = &spi->dev; | |
745 | ||
47026b25 MH |
746 | __set_bit(EV_KEY, input_dev->evbit); |
747 | __set_bit(BTN_TOUCH, input_dev->keybit); | |
331b78ed MH |
748 | __set_bit(EV_ABS, input_dev->evbit); |
749 | __set_bit(ABS_X, input_dev->absbit); | |
750 | __set_bit(ABS_Y, input_dev->absbit); | |
751 | __set_bit(ABS_PRESSURE, input_dev->absbit); | |
752 | ||
753 | input_set_abs_params(input_dev, ABS_X, | |
754 | pdata->x_min ? : 0, | |
755 | pdata->x_max ? : MAX_12BIT, | |
756 | 0, 0); | |
757 | input_set_abs_params(input_dev, ABS_Y, | |
758 | pdata->y_min ? : 0, | |
759 | pdata->y_max ? : MAX_12BIT, | |
760 | 0, 0); | |
761 | input_set_abs_params(input_dev, ABS_PRESSURE, | |
762 | pdata->pressure_min, pdata->pressure_max, 0, 0); | |
763 | ||
764 | ad7877_write(spi, AD7877_REG_SEQ1, AD7877_MM_SEQUENCE); | |
765 | ||
766 | verify = ad7877_read(spi, AD7877_REG_SEQ1); | |
767 | ||
768 | if (verify != AD7877_MM_SEQUENCE){ | |
769 | dev_err(&spi->dev, "%s: Failed to probe %s\n", | |
770 | dev_name(&spi->dev), input_dev->name); | |
771 | err = -ENODEV; | |
772 | goto err_free_mem; | |
773 | } | |
774 | ||
775 | if (gpio3) | |
776 | ad7877_write(spi, AD7877_REG_EXTWRITE, AD7877_EXTW_GPIO_3_CONF); | |
777 | ||
778 | ad7877_setup_ts_def_msg(spi, ts); | |
779 | ||
780 | /* Request AD7877 /DAV GPIO interrupt */ | |
781 | ||
b534422b DT |
782 | err = request_threaded_irq(spi->irq, NULL, ad7877_irq, |
783 | IRQF_TRIGGER_FALLING | IRQF_ONESHOT, | |
784 | spi->dev.driver->name, ts); | |
331b78ed MH |
785 | if (err) { |
786 | dev_dbg(&spi->dev, "irq %d busy?\n", spi->irq); | |
787 | goto err_free_mem; | |
788 | } | |
789 | ||
790 | err = sysfs_create_group(&spi->dev.kobj, &ad7877_attr_group); | |
791 | if (err) | |
792 | goto err_free_irq; | |
793 | ||
331b78ed MH |
794 | err = input_register_device(input_dev); |
795 | if (err) | |
2fd18aba | 796 | goto err_remove_attr_group; |
331b78ed MH |
797 | |
798 | return 0; | |
799 | ||
331b78ed MH |
800 | err_remove_attr_group: |
801 | sysfs_remove_group(&spi->dev.kobj, &ad7877_attr_group); | |
802 | err_free_irq: | |
803 | free_irq(spi->irq, ts); | |
804 | err_free_mem: | |
805 | input_free_device(input_dev); | |
806 | kfree(ts); | |
807 | dev_set_drvdata(&spi->dev, NULL); | |
808 | return err; | |
809 | } | |
810 | ||
811 | static int __devexit ad7877_remove(struct spi_device *spi) | |
812 | { | |
2fd18aba | 813 | struct ad7877 *ts = dev_get_drvdata(&spi->dev); |
331b78ed MH |
814 | |
815 | sysfs_remove_group(&spi->dev.kobj, &ad7877_attr_group); | |
331b78ed MH |
816 | |
817 | ad7877_disable(ts); | |
818 | free_irq(ts->spi->irq, ts); | |
819 | ||
820 | input_unregister_device(ts->input); | |
821 | kfree(ts); | |
822 | ||
823 | dev_dbg(&spi->dev, "unregistered touchscreen\n"); | |
824 | dev_set_drvdata(&spi->dev, NULL); | |
825 | ||
826 | return 0; | |
827 | } | |
828 | ||
829 | #ifdef CONFIG_PM | |
830 | static int ad7877_suspend(struct spi_device *spi, pm_message_t message) | |
831 | { | |
832 | struct ad7877 *ts = dev_get_drvdata(&spi->dev); | |
833 | ||
834 | ad7877_disable(ts); | |
835 | ||
836 | return 0; | |
837 | } | |
838 | ||
839 | static int ad7877_resume(struct spi_device *spi) | |
840 | { | |
841 | struct ad7877 *ts = dev_get_drvdata(&spi->dev); | |
842 | ||
843 | ad7877_enable(ts); | |
844 | ||
845 | return 0; | |
846 | } | |
847 | #else | |
848 | #define ad7877_suspend NULL | |
849 | #define ad7877_resume NULL | |
850 | #endif | |
851 | ||
852 | static struct spi_driver ad7877_driver = { | |
853 | .driver = { | |
854 | .name = "ad7877", | |
855 | .bus = &spi_bus_type, | |
856 | .owner = THIS_MODULE, | |
857 | }, | |
858 | .probe = ad7877_probe, | |
859 | .remove = __devexit_p(ad7877_remove), | |
860 | .suspend = ad7877_suspend, | |
861 | .resume = ad7877_resume, | |
862 | }; | |
863 | ||
864 | static int __init ad7877_init(void) | |
865 | { | |
866 | return spi_register_driver(&ad7877_driver); | |
867 | } | |
868 | module_init(ad7877_init); | |
869 | ||
870 | static void __exit ad7877_exit(void) | |
871 | { | |
872 | spi_unregister_driver(&ad7877_driver); | |
873 | } | |
874 | module_exit(ad7877_exit); | |
875 | ||
876 | MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>"); | |
877 | MODULE_DESCRIPTION("AD7877 touchscreen Driver"); | |
878 | MODULE_LICENSE("GPL"); | |
e0626e38 | 879 | MODULE_ALIAS("spi:ad7877"); |