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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> | |
331b78ed MH |
40 | #include <linux/delay.h> |
41 | #include <linux/input.h> | |
42 | #include <linux/interrupt.h> | |
fccdd7c4 | 43 | #include <linux/pm.h> |
331b78ed MH |
44 | #include <linux/slab.h> |
45 | #include <linux/spi/spi.h> | |
46 | #include <linux/spi/ad7877.h> | |
d2d8442d | 47 | #include <linux/module.h> |
331b78ed MH |
48 | #include <asm/irq.h> |
49 | ||
4eb6f91b | 50 | #define TS_PEN_UP_TIMEOUT msecs_to_jiffies(100) |
331b78ed MH |
51 | |
52 | #define MAX_SPI_FREQ_HZ 20000000 | |
53 | #define MAX_12BIT ((1<<12)-1) | |
54 | ||
55 | #define AD7877_REG_ZEROS 0 | |
56 | #define AD7877_REG_CTRL1 1 | |
57 | #define AD7877_REG_CTRL2 2 | |
58 | #define AD7877_REG_ALERT 3 | |
59 | #define AD7877_REG_AUX1HIGH 4 | |
60 | #define AD7877_REG_AUX1LOW 5 | |
61 | #define AD7877_REG_BAT1HIGH 6 | |
62 | #define AD7877_REG_BAT1LOW 7 | |
63 | #define AD7877_REG_BAT2HIGH 8 | |
64 | #define AD7877_REG_BAT2LOW 9 | |
65 | #define AD7877_REG_TEMP1HIGH 10 | |
66 | #define AD7877_REG_TEMP1LOW 11 | |
67 | #define AD7877_REG_SEQ0 12 | |
68 | #define AD7877_REG_SEQ1 13 | |
69 | #define AD7877_REG_DAC 14 | |
70 | #define AD7877_REG_NONE1 15 | |
71 | #define AD7877_REG_EXTWRITE 15 | |
72 | #define AD7877_REG_XPLUS 16 | |
73 | #define AD7877_REG_YPLUS 17 | |
74 | #define AD7877_REG_Z2 18 | |
75 | #define AD7877_REG_aux1 19 | |
76 | #define AD7877_REG_aux2 20 | |
77 | #define AD7877_REG_aux3 21 | |
78 | #define AD7877_REG_bat1 22 | |
79 | #define AD7877_REG_bat2 23 | |
80 | #define AD7877_REG_temp1 24 | |
81 | #define AD7877_REG_temp2 25 | |
82 | #define AD7877_REG_Z1 26 | |
83 | #define AD7877_REG_GPIOCTRL1 27 | |
84 | #define AD7877_REG_GPIOCTRL2 28 | |
85 | #define AD7877_REG_GPIODATA 29 | |
86 | #define AD7877_REG_NONE2 30 | |
87 | #define AD7877_REG_NONE3 31 | |
88 | ||
89 | #define AD7877_SEQ_YPLUS_BIT (1<<11) | |
90 | #define AD7877_SEQ_XPLUS_BIT (1<<10) | |
91 | #define AD7877_SEQ_Z2_BIT (1<<9) | |
92 | #define AD7877_SEQ_AUX1_BIT (1<<8) | |
93 | #define AD7877_SEQ_AUX2_BIT (1<<7) | |
94 | #define AD7877_SEQ_AUX3_BIT (1<<6) | |
95 | #define AD7877_SEQ_BAT1_BIT (1<<5) | |
96 | #define AD7877_SEQ_BAT2_BIT (1<<4) | |
97 | #define AD7877_SEQ_TEMP1_BIT (1<<3) | |
98 | #define AD7877_SEQ_TEMP2_BIT (1<<2) | |
99 | #define AD7877_SEQ_Z1_BIT (1<<1) | |
100 | ||
101 | enum { | |
102 | AD7877_SEQ_YPOS = 0, | |
103 | AD7877_SEQ_XPOS = 1, | |
104 | AD7877_SEQ_Z2 = 2, | |
105 | AD7877_SEQ_AUX1 = 3, | |
106 | AD7877_SEQ_AUX2 = 4, | |
107 | AD7877_SEQ_AUX3 = 5, | |
108 | AD7877_SEQ_BAT1 = 6, | |
109 | AD7877_SEQ_BAT2 = 7, | |
110 | AD7877_SEQ_TEMP1 = 8, | |
111 | AD7877_SEQ_TEMP2 = 9, | |
112 | AD7877_SEQ_Z1 = 10, | |
113 | AD7877_NR_SENSE = 11, | |
114 | }; | |
115 | ||
116 | /* DAC Register Default RANGE 0 to Vcc, Volatge Mode, DAC On */ | |
117 | #define AD7877_DAC_CONF 0x1 | |
118 | ||
119 | /* If gpio3 is set AUX3/GPIO3 acts as GPIO Output */ | |
120 | #define AD7877_EXTW_GPIO_3_CONF 0x1C4 | |
121 | #define AD7877_EXTW_GPIO_DATA 0x200 | |
122 | ||
123 | /* Control REG 2 */ | |
124 | #define AD7877_TMR(x) ((x & 0x3) << 0) | |
125 | #define AD7877_REF(x) ((x & 0x1) << 2) | |
126 | #define AD7877_POL(x) ((x & 0x1) << 3) | |
127 | #define AD7877_FCD(x) ((x & 0x3) << 4) | |
128 | #define AD7877_PM(x) ((x & 0x3) << 6) | |
129 | #define AD7877_ACQ(x) ((x & 0x3) << 8) | |
130 | #define AD7877_AVG(x) ((x & 0x3) << 10) | |
131 | ||
132 | /* Control REG 1 */ | |
133 | #define AD7877_SER (1 << 11) /* non-differential */ | |
134 | #define AD7877_DFR (0 << 11) /* differential */ | |
135 | ||
136 | #define AD7877_MODE_NOC (0) /* Do not convert */ | |
137 | #define AD7877_MODE_SCC (1) /* Single channel conversion */ | |
138 | #define AD7877_MODE_SEQ0 (2) /* Sequence 0 in Slave Mode */ | |
139 | #define AD7877_MODE_SEQ1 (3) /* Sequence 1 in Master Mode */ | |
140 | ||
141 | #define AD7877_CHANADD(x) ((x&0xF)<<7) | |
142 | #define AD7877_READADD(x) ((x)<<2) | |
143 | #define AD7877_WRITEADD(x) ((x)<<12) | |
144 | ||
145 | #define AD7877_READ_CHAN(x) (AD7877_WRITEADD(AD7877_REG_CTRL1) | AD7877_SER | \ | |
146 | AD7877_MODE_SCC | AD7877_CHANADD(AD7877_REG_ ## x) | \ | |
147 | AD7877_READADD(AD7877_REG_ ## x)) | |
148 | ||
149 | #define AD7877_MM_SEQUENCE (AD7877_SEQ_YPLUS_BIT | AD7877_SEQ_XPLUS_BIT | \ | |
150 | AD7877_SEQ_Z2_BIT | AD7877_SEQ_Z1_BIT) | |
151 | ||
152 | /* | |
153 | * Non-touchscreen sensors only use single-ended conversions. | |
154 | */ | |
155 | ||
156 | struct ser_req { | |
157 | u16 reset; | |
158 | u16 ref_on; | |
159 | u16 command; | |
331b78ed MH |
160 | struct spi_message msg; |
161 | struct spi_transfer xfer[6]; | |
3843384a OS |
162 | |
163 | /* | |
164 | * DMA (thus cache coherency maintenance) requires the | |
165 | * transfer buffers to live in their own cache lines. | |
166 | */ | |
167 | u16 sample ____cacheline_aligned; | |
331b78ed MH |
168 | }; |
169 | ||
170 | struct ad7877 { | |
171 | struct input_dev *input; | |
172 | char phys[32]; | |
173 | ||
174 | struct spi_device *spi; | |
175 | u16 model; | |
176 | u16 vref_delay_usecs; | |
177 | u16 x_plate_ohms; | |
178 | u16 pressure_max; | |
179 | ||
180 | u16 cmd_crtl1; | |
181 | u16 cmd_crtl2; | |
182 | u16 cmd_dummy; | |
183 | u16 dac; | |
184 | ||
185 | u8 stopacq_polarity; | |
186 | u8 first_conversion_delay; | |
187 | u8 acquisition_time; | |
188 | u8 averaging; | |
189 | u8 pen_down_acc_interval; | |
190 | ||
331b78ed MH |
191 | struct spi_transfer xfer[AD7877_NR_SENSE + 2]; |
192 | struct spi_message msg; | |
193 | ||
194 | struct mutex mutex; | |
b534422b DT |
195 | bool disabled; /* P: mutex */ |
196 | bool gpio3; /* P: mutex */ | |
197 | bool gpio4; /* P: mutex */ | |
331b78ed MH |
198 | |
199 | spinlock_t lock; | |
200 | struct timer_list timer; /* 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 | ||
331b78ed MH |
213 | static int ad7877_read(struct spi_device *spi, u16 reg) |
214 | { | |
215 | struct ser_req *req; | |
216 | int status, ret; | |
217 | ||
218 | req = kzalloc(sizeof *req, GFP_KERNEL); | |
219 | if (!req) | |
220 | return -ENOMEM; | |
221 | ||
222 | spi_message_init(&req->msg); | |
223 | ||
224 | req->command = (u16) (AD7877_WRITEADD(AD7877_REG_CTRL1) | | |
225 | AD7877_READADD(reg)); | |
226 | req->xfer[0].tx_buf = &req->command; | |
227 | req->xfer[0].len = 2; | |
e92c27fb | 228 | req->xfer[0].cs_change = 1; |
331b78ed MH |
229 | |
230 | req->xfer[1].rx_buf = &req->sample; | |
231 | req->xfer[1].len = 2; | |
232 | ||
233 | spi_message_add_tail(&req->xfer[0], &req->msg); | |
234 | spi_message_add_tail(&req->xfer[1], &req->msg); | |
235 | ||
236 | status = spi_sync(spi, &req->msg); | |
237 | ret = status ? : req->sample; | |
238 | ||
239 | kfree(req); | |
240 | ||
241 | return ret; | |
242 | } | |
243 | ||
244 | static int ad7877_write(struct spi_device *spi, u16 reg, u16 val) | |
245 | { | |
246 | struct ser_req *req; | |
247 | int status; | |
248 | ||
249 | req = kzalloc(sizeof *req, GFP_KERNEL); | |
250 | if (!req) | |
251 | return -ENOMEM; | |
252 | ||
253 | spi_message_init(&req->msg); | |
254 | ||
255 | req->command = (u16) (AD7877_WRITEADD(reg) | (val & MAX_12BIT)); | |
256 | req->xfer[0].tx_buf = &req->command; | |
257 | req->xfer[0].len = 2; | |
258 | ||
259 | spi_message_add_tail(&req->xfer[0], &req->msg); | |
260 | ||
261 | status = spi_sync(spi, &req->msg); | |
262 | ||
263 | kfree(req); | |
264 | ||
265 | return status; | |
266 | } | |
267 | ||
268 | static int ad7877_read_adc(struct spi_device *spi, unsigned command) | |
269 | { | |
e1793c69 | 270 | struct ad7877 *ts = spi_get_drvdata(spi); |
331b78ed MH |
271 | struct ser_req *req; |
272 | int status; | |
273 | int sample; | |
274 | int i; | |
275 | ||
276 | req = kzalloc(sizeof *req, GFP_KERNEL); | |
277 | if (!req) | |
278 | return -ENOMEM; | |
279 | ||
280 | spi_message_init(&req->msg); | |
281 | ||
282 | /* activate reference, so it has time to settle; */ | |
283 | req->ref_on = AD7877_WRITEADD(AD7877_REG_CTRL2) | | |
284 | AD7877_POL(ts->stopacq_polarity) | | |
285 | AD7877_AVG(0) | AD7877_PM(2) | AD7877_TMR(0) | | |
286 | AD7877_ACQ(ts->acquisition_time) | AD7877_FCD(0); | |
287 | ||
288 | req->reset = AD7877_WRITEADD(AD7877_REG_CTRL1) | AD7877_MODE_NOC; | |
289 | ||
290 | req->command = (u16) command; | |
291 | ||
292 | req->xfer[0].tx_buf = &req->reset; | |
293 | req->xfer[0].len = 2; | |
e92c27fb | 294 | req->xfer[0].cs_change = 1; |
331b78ed MH |
295 | |
296 | req->xfer[1].tx_buf = &req->ref_on; | |
297 | req->xfer[1].len = 2; | |
298 | req->xfer[1].delay_usecs = ts->vref_delay_usecs; | |
e92c27fb | 299 | req->xfer[1].cs_change = 1; |
331b78ed MH |
300 | |
301 | req->xfer[2].tx_buf = &req->command; | |
302 | req->xfer[2].len = 2; | |
303 | req->xfer[2].delay_usecs = ts->vref_delay_usecs; | |
e92c27fb | 304 | req->xfer[2].cs_change = 1; |
331b78ed MH |
305 | |
306 | req->xfer[3].rx_buf = &req->sample; | |
307 | req->xfer[3].len = 2; | |
e92c27fb | 308 | req->xfer[3].cs_change = 1; |
331b78ed MH |
309 | |
310 | req->xfer[4].tx_buf = &ts->cmd_crtl2; /*REF OFF*/ | |
311 | req->xfer[4].len = 2; | |
e92c27fb | 312 | req->xfer[4].cs_change = 1; |
331b78ed MH |
313 | |
314 | req->xfer[5].tx_buf = &ts->cmd_crtl1; /*DEFAULT*/ | |
315 | req->xfer[5].len = 2; | |
316 | ||
317 | /* group all the transfers together, so we can't interfere with | |
318 | * reading touchscreen state; disable penirq while sampling | |
319 | */ | |
320 | for (i = 0; i < 6; i++) | |
321 | spi_message_add_tail(&req->xfer[i], &req->msg); | |
322 | ||
323 | status = spi_sync(spi, &req->msg); | |
324 | sample = req->sample; | |
325 | ||
326 | kfree(req); | |
327 | ||
328 | return status ? : sample; | |
329 | } | |
330 | ||
b534422b | 331 | static int ad7877_process_data(struct ad7877 *ts) |
331b78ed MH |
332 | { |
333 | struct input_dev *input_dev = ts->input; | |
334 | unsigned Rt; | |
335 | u16 x, y, z1, z2; | |
336 | ||
337 | x = ts->conversion_data[AD7877_SEQ_XPOS] & MAX_12BIT; | |
338 | y = ts->conversion_data[AD7877_SEQ_YPOS] & MAX_12BIT; | |
339 | z1 = ts->conversion_data[AD7877_SEQ_Z1] & MAX_12BIT; | |
340 | z2 = ts->conversion_data[AD7877_SEQ_Z2] & MAX_12BIT; | |
341 | ||
342 | /* | |
343 | * The samples processed here are already preprocessed by the AD7877. | |
344 | * The preprocessing function consists of an averaging filter. | |
345 | * The combination of 'first conversion delay' and averaging provides a robust solution, | |
346 | * discarding the spurious noise in the signal and keeping only the data of interest. | |
347 | * The size of the averaging filter is programmable. (dev.platform_data, see linux/spi/ad7877.h) | |
348 | * Other user-programmable conversion controls include variable acquisition time, | |
349 | * and first conversion delay. Up to 16 averages can be taken per conversion. | |
350 | */ | |
351 | ||
352 | if (likely(x && z1)) { | |
353 | /* compute touch pressure resistance using equation #1 */ | |
354 | Rt = (z2 - z1) * x * ts->x_plate_ohms; | |
355 | Rt /= z1; | |
356 | Rt = (Rt + 2047) >> 12; | |
357 | ||
1d02ad43 MH |
358 | /* |
359 | * Sample found inconsistent, pressure is beyond | |
360 | * the maximum. Don't report it to user space. | |
361 | */ | |
362 | if (Rt > ts->pressure_max) | |
363 | return -EINVAL; | |
364 | ||
47026b25 MH |
365 | if (!timer_pending(&ts->timer)) |
366 | input_report_key(input_dev, BTN_TOUCH, 1); | |
367 | ||
331b78ed MH |
368 | input_report_abs(input_dev, ABS_X, x); |
369 | input_report_abs(input_dev, ABS_Y, y); | |
370 | input_report_abs(input_dev, ABS_PRESSURE, Rt); | |
371 | input_sync(input_dev); | |
b534422b | 372 | |
47026b25 | 373 | return 0; |
331b78ed | 374 | } |
47026b25 MH |
375 | |
376 | return -EINVAL; | |
331b78ed MH |
377 | } |
378 | ||
379 | static inline void ad7877_ts_event_release(struct ad7877 *ts) | |
380 | { | |
381 | struct input_dev *input_dev = ts->input; | |
382 | ||
383 | input_report_abs(input_dev, ABS_PRESSURE, 0); | |
47026b25 | 384 | input_report_key(input_dev, BTN_TOUCH, 0); |
331b78ed MH |
385 | input_sync(input_dev); |
386 | } | |
387 | ||
388 | static void ad7877_timer(unsigned long handle) | |
389 | { | |
390 | struct ad7877 *ts = (void *)handle; | |
b534422b | 391 | unsigned long flags; |
331b78ed | 392 | |
b534422b | 393 | spin_lock_irqsave(&ts->lock, flags); |
331b78ed | 394 | ad7877_ts_event_release(ts); |
b534422b | 395 | spin_unlock_irqrestore(&ts->lock, flags); |
331b78ed MH |
396 | } |
397 | ||
398 | static irqreturn_t ad7877_irq(int irq, void *handle) | |
399 | { | |
400 | struct ad7877 *ts = handle; | |
401 | unsigned long flags; | |
b534422b | 402 | int error; |
331b78ed | 403 | |
b534422b DT |
404 | error = spi_sync(ts->spi, &ts->msg); |
405 | if (error) { | |
406 | dev_err(&ts->spi->dev, "spi_sync --> %d\n", error); | |
407 | goto out; | |
408 | } | |
331b78ed MH |
409 | |
410 | spin_lock_irqsave(&ts->lock, flags); | |
b534422b DT |
411 | error = ad7877_process_data(ts); |
412 | if (!error) | |
413 | mod_timer(&ts->timer, jiffies + TS_PEN_UP_TIMEOUT); | |
331b78ed MH |
414 | spin_unlock_irqrestore(&ts->lock, flags); |
415 | ||
b534422b | 416 | out: |
331b78ed MH |
417 | return IRQ_HANDLED; |
418 | } | |
419 | ||
331b78ed MH |
420 | static void ad7877_disable(struct ad7877 *ts) |
421 | { | |
422 | mutex_lock(&ts->mutex); | |
423 | ||
424 | if (!ts->disabled) { | |
b534422b | 425 | ts->disabled = true; |
331b78ed MH |
426 | disable_irq(ts->spi->irq); |
427 | ||
331b78ed MH |
428 | if (del_timer_sync(&ts->timer)) |
429 | ad7877_ts_event_release(ts); | |
430 | } | |
431 | ||
b534422b DT |
432 | /* |
433 | * We know the chip's in lowpower mode since we always | |
331b78ed MH |
434 | * leave it that way after every request |
435 | */ | |
436 | ||
437 | mutex_unlock(&ts->mutex); | |
438 | } | |
439 | ||
440 | static void ad7877_enable(struct ad7877 *ts) | |
441 | { | |
442 | mutex_lock(&ts->mutex); | |
443 | ||
444 | if (ts->disabled) { | |
b534422b | 445 | ts->disabled = false; |
331b78ed MH |
446 | enable_irq(ts->spi->irq); |
447 | } | |
448 | ||
449 | mutex_unlock(&ts->mutex); | |
450 | } | |
451 | ||
452 | #define SHOW(name) static ssize_t \ | |
453 | name ## _show(struct device *dev, struct device_attribute *attr, char *buf) \ | |
454 | { \ | |
2fd18aba | 455 | struct ad7877 *ts = dev_get_drvdata(dev); \ |
331b78ed MH |
456 | ssize_t v = ad7877_read_adc(ts->spi, \ |
457 | AD7877_READ_CHAN(name)); \ | |
458 | if (v < 0) \ | |
459 | return v; \ | |
460 | return sprintf(buf, "%u\n", (unsigned) v); \ | |
461 | } \ | |
462 | static DEVICE_ATTR(name, S_IRUGO, name ## _show, NULL); | |
463 | ||
464 | SHOW(aux1) | |
465 | SHOW(aux2) | |
466 | SHOW(aux3) | |
467 | SHOW(bat1) | |
468 | SHOW(bat2) | |
469 | SHOW(temp1) | |
470 | SHOW(temp2) | |
471 | ||
472 | static ssize_t ad7877_disable_show(struct device *dev, | |
473 | struct device_attribute *attr, char *buf) | |
474 | { | |
2fd18aba | 475 | struct ad7877 *ts = dev_get_drvdata(dev); |
331b78ed MH |
476 | |
477 | return sprintf(buf, "%u\n", ts->disabled); | |
478 | } | |
479 | ||
480 | static ssize_t ad7877_disable_store(struct device *dev, | |
481 | struct device_attribute *attr, | |
482 | const char *buf, size_t count) | |
483 | { | |
484 | struct ad7877 *ts = dev_get_drvdata(dev); | |
76496e7a | 485 | unsigned int val; |
331b78ed MH |
486 | int error; |
487 | ||
76496e7a | 488 | error = kstrtouint(buf, 10, &val); |
331b78ed MH |
489 | if (error) |
490 | return error; | |
491 | ||
492 | if (val) | |
493 | ad7877_disable(ts); | |
494 | else | |
495 | ad7877_enable(ts); | |
496 | ||
497 | return count; | |
498 | } | |
499 | ||
500 | static DEVICE_ATTR(disable, 0664, ad7877_disable_show, ad7877_disable_store); | |
501 | ||
502 | static ssize_t ad7877_dac_show(struct device *dev, | |
503 | struct device_attribute *attr, char *buf) | |
504 | { | |
2fd18aba | 505 | struct ad7877 *ts = dev_get_drvdata(dev); |
331b78ed MH |
506 | |
507 | return sprintf(buf, "%u\n", ts->dac); | |
508 | } | |
509 | ||
510 | static ssize_t ad7877_dac_store(struct device *dev, | |
511 | struct device_attribute *attr, | |
512 | const char *buf, size_t count) | |
513 | { | |
514 | struct ad7877 *ts = dev_get_drvdata(dev); | |
76496e7a | 515 | unsigned int val; |
331b78ed MH |
516 | int error; |
517 | ||
76496e7a | 518 | error = kstrtouint(buf, 10, &val); |
331b78ed MH |
519 | if (error) |
520 | return error; | |
521 | ||
522 | mutex_lock(&ts->mutex); | |
523 | ts->dac = val & 0xFF; | |
524 | ad7877_write(ts->spi, AD7877_REG_DAC, (ts->dac << 4) | AD7877_DAC_CONF); | |
525 | mutex_unlock(&ts->mutex); | |
526 | ||
527 | return count; | |
528 | } | |
529 | ||
530 | static DEVICE_ATTR(dac, 0664, ad7877_dac_show, ad7877_dac_store); | |
531 | ||
532 | static ssize_t ad7877_gpio3_show(struct device *dev, | |
533 | struct device_attribute *attr, char *buf) | |
534 | { | |
2fd18aba | 535 | struct ad7877 *ts = dev_get_drvdata(dev); |
331b78ed MH |
536 | |
537 | return sprintf(buf, "%u\n", ts->gpio3); | |
538 | } | |
539 | ||
540 | static ssize_t ad7877_gpio3_store(struct device *dev, | |
541 | struct device_attribute *attr, | |
542 | const char *buf, size_t count) | |
543 | { | |
544 | struct ad7877 *ts = dev_get_drvdata(dev); | |
76496e7a | 545 | unsigned int val; |
331b78ed MH |
546 | int error; |
547 | ||
76496e7a | 548 | error = kstrtouint(buf, 10, &val); |
331b78ed MH |
549 | if (error) |
550 | return error; | |
551 | ||
552 | mutex_lock(&ts->mutex); | |
553 | ts->gpio3 = !!val; | |
554 | ad7877_write(ts->spi, AD7877_REG_EXTWRITE, AD7877_EXTW_GPIO_DATA | | |
555 | (ts->gpio4 << 4) | (ts->gpio3 << 5)); | |
556 | mutex_unlock(&ts->mutex); | |
557 | ||
558 | return count; | |
559 | } | |
560 | ||
561 | static DEVICE_ATTR(gpio3, 0664, ad7877_gpio3_show, ad7877_gpio3_store); | |
562 | ||
563 | static ssize_t ad7877_gpio4_show(struct device *dev, | |
564 | struct device_attribute *attr, char *buf) | |
565 | { | |
2fd18aba | 566 | struct ad7877 *ts = dev_get_drvdata(dev); |
331b78ed MH |
567 | |
568 | return sprintf(buf, "%u\n", ts->gpio4); | |
569 | } | |
570 | ||
571 | static ssize_t ad7877_gpio4_store(struct device *dev, | |
572 | struct device_attribute *attr, | |
573 | const char *buf, size_t count) | |
574 | { | |
575 | struct ad7877 *ts = dev_get_drvdata(dev); | |
76496e7a | 576 | unsigned int val; |
331b78ed MH |
577 | int error; |
578 | ||
76496e7a | 579 | error = kstrtouint(buf, 10, &val); |
331b78ed MH |
580 | if (error) |
581 | return error; | |
582 | ||
583 | mutex_lock(&ts->mutex); | |
584 | ts->gpio4 = !!val; | |
585 | ad7877_write(ts->spi, AD7877_REG_EXTWRITE, AD7877_EXTW_GPIO_DATA | | |
586 | (ts->gpio4 << 4) | (ts->gpio3 << 5)); | |
587 | mutex_unlock(&ts->mutex); | |
588 | ||
589 | return count; | |
590 | } | |
591 | ||
592 | static DEVICE_ATTR(gpio4, 0664, ad7877_gpio4_show, ad7877_gpio4_store); | |
593 | ||
594 | static struct attribute *ad7877_attributes[] = { | |
595 | &dev_attr_temp1.attr, | |
596 | &dev_attr_temp2.attr, | |
597 | &dev_attr_aux1.attr, | |
598 | &dev_attr_aux2.attr, | |
2fd18aba | 599 | &dev_attr_aux3.attr, |
331b78ed MH |
600 | &dev_attr_bat1.attr, |
601 | &dev_attr_bat2.attr, | |
602 | &dev_attr_disable.attr, | |
603 | &dev_attr_dac.attr, | |
2fd18aba | 604 | &dev_attr_gpio3.attr, |
331b78ed MH |
605 | &dev_attr_gpio4.attr, |
606 | NULL | |
607 | }; | |
608 | ||
587a1f16 | 609 | static umode_t ad7877_attr_is_visible(struct kobject *kobj, |
2fd18aba DT |
610 | struct attribute *attr, int n) |
611 | { | |
587a1f16 | 612 | umode_t mode = attr->mode; |
2fd18aba DT |
613 | |
614 | if (attr == &dev_attr_aux3.attr) { | |
615 | if (gpio3) | |
616 | mode = 0; | |
617 | } else if (attr == &dev_attr_gpio3.attr) { | |
618 | if (!gpio3) | |
619 | mode = 0; | |
620 | } | |
621 | ||
622 | return mode; | |
623 | } | |
624 | ||
331b78ed | 625 | static const struct attribute_group ad7877_attr_group = { |
2fd18aba DT |
626 | .is_visible = ad7877_attr_is_visible, |
627 | .attrs = ad7877_attributes, | |
331b78ed MH |
628 | }; |
629 | ||
630 | static void ad7877_setup_ts_def_msg(struct spi_device *spi, struct ad7877 *ts) | |
631 | { | |
632 | struct spi_message *m; | |
633 | int i; | |
634 | ||
635 | ts->cmd_crtl2 = AD7877_WRITEADD(AD7877_REG_CTRL2) | | |
636 | AD7877_POL(ts->stopacq_polarity) | | |
637 | AD7877_AVG(ts->averaging) | AD7877_PM(1) | | |
638 | AD7877_TMR(ts->pen_down_acc_interval) | | |
639 | AD7877_ACQ(ts->acquisition_time) | | |
640 | AD7877_FCD(ts->first_conversion_delay); | |
641 | ||
642 | ad7877_write(spi, AD7877_REG_CTRL2, ts->cmd_crtl2); | |
643 | ||
644 | ts->cmd_crtl1 = AD7877_WRITEADD(AD7877_REG_CTRL1) | | |
645 | AD7877_READADD(AD7877_REG_XPLUS-1) | | |
646 | AD7877_MODE_SEQ1 | AD7877_DFR; | |
647 | ||
648 | ad7877_write(spi, AD7877_REG_CTRL1, ts->cmd_crtl1); | |
649 | ||
650 | ts->cmd_dummy = 0; | |
651 | ||
652 | m = &ts->msg; | |
653 | ||
654 | spi_message_init(m); | |
655 | ||
331b78ed MH |
656 | m->context = ts; |
657 | ||
658 | ts->xfer[0].tx_buf = &ts->cmd_crtl1; | |
659 | ts->xfer[0].len = 2; | |
e92c27fb | 660 | ts->xfer[0].cs_change = 1; |
331b78ed MH |
661 | |
662 | spi_message_add_tail(&ts->xfer[0], m); | |
663 | ||
664 | ts->xfer[1].tx_buf = &ts->cmd_dummy; /* Send ZERO */ | |
665 | ts->xfer[1].len = 2; | |
e92c27fb | 666 | ts->xfer[1].cs_change = 1; |
331b78ed MH |
667 | |
668 | spi_message_add_tail(&ts->xfer[1], m); | |
669 | ||
e92c27fb | 670 | for (i = 0; i < AD7877_NR_SENSE; i++) { |
331b78ed MH |
671 | ts->xfer[i + 2].rx_buf = &ts->conversion_data[AD7877_SEQ_YPOS + i]; |
672 | ts->xfer[i + 2].len = 2; | |
e92c27fb MH |
673 | if (i < (AD7877_NR_SENSE - 1)) |
674 | ts->xfer[i + 2].cs_change = 1; | |
331b78ed MH |
675 | spi_message_add_tail(&ts->xfer[i + 2], m); |
676 | } | |
677 | } | |
678 | ||
5298cc4c | 679 | static int ad7877_probe(struct spi_device *spi) |
331b78ed MH |
680 | { |
681 | struct ad7877 *ts; | |
682 | struct input_dev *input_dev; | |
c838cb3d | 683 | struct ad7877_platform_data *pdata = dev_get_platdata(&spi->dev); |
331b78ed MH |
684 | int err; |
685 | u16 verify; | |
686 | ||
687 | if (!spi->irq) { | |
688 | dev_dbg(&spi->dev, "no IRQ?\n"); | |
689 | return -ENODEV; | |
690 | } | |
691 | ||
692 | if (!pdata) { | |
693 | dev_dbg(&spi->dev, "no platform data?\n"); | |
694 | return -ENODEV; | |
695 | } | |
696 | ||
697 | /* don't exceed max specified SPI CLK frequency */ | |
698 | if (spi->max_speed_hz > MAX_SPI_FREQ_HZ) { | |
699 | dev_dbg(&spi->dev, "SPI CLK %d Hz?\n",spi->max_speed_hz); | |
700 | return -EINVAL; | |
701 | } | |
702 | ||
cd9b6fdf OS |
703 | spi->bits_per_word = 16; |
704 | err = spi_setup(spi); | |
705 | if (err) { | |
706 | dev_dbg(&spi->dev, "spi master doesn't support 16 bits/word\n"); | |
707 | return err; | |
708 | } | |
709 | ||
331b78ed MH |
710 | ts = kzalloc(sizeof(struct ad7877), GFP_KERNEL); |
711 | input_dev = input_allocate_device(); | |
712 | if (!ts || !input_dev) { | |
713 | err = -ENOMEM; | |
714 | goto err_free_mem; | |
715 | } | |
716 | ||
e1793c69 | 717 | spi_set_drvdata(spi, ts); |
331b78ed MH |
718 | ts->spi = spi; |
719 | ts->input = input_dev; | |
720 | ||
721 | setup_timer(&ts->timer, ad7877_timer, (unsigned long) ts); | |
722 | mutex_init(&ts->mutex); | |
723 | spin_lock_init(&ts->lock); | |
724 | ||
725 | ts->model = pdata->model ? : 7877; | |
726 | ts->vref_delay_usecs = pdata->vref_delay_usecs ? : 100; | |
727 | ts->x_plate_ohms = pdata->x_plate_ohms ? : 400; | |
728 | ts->pressure_max = pdata->pressure_max ? : ~0; | |
729 | ||
730 | ts->stopacq_polarity = pdata->stopacq_polarity; | |
731 | ts->first_conversion_delay = pdata->first_conversion_delay; | |
732 | ts->acquisition_time = pdata->acquisition_time; | |
733 | ts->averaging = pdata->averaging; | |
734 | ts->pen_down_acc_interval = pdata->pen_down_acc_interval; | |
735 | ||
736 | snprintf(ts->phys, sizeof(ts->phys), "%s/input0", dev_name(&spi->dev)); | |
737 | ||
738 | input_dev->name = "AD7877 Touchscreen"; | |
739 | input_dev->phys = ts->phys; | |
740 | input_dev->dev.parent = &spi->dev; | |
741 | ||
47026b25 MH |
742 | __set_bit(EV_KEY, input_dev->evbit); |
743 | __set_bit(BTN_TOUCH, input_dev->keybit); | |
331b78ed MH |
744 | __set_bit(EV_ABS, input_dev->evbit); |
745 | __set_bit(ABS_X, input_dev->absbit); | |
746 | __set_bit(ABS_Y, input_dev->absbit); | |
747 | __set_bit(ABS_PRESSURE, input_dev->absbit); | |
748 | ||
749 | input_set_abs_params(input_dev, ABS_X, | |
750 | pdata->x_min ? : 0, | |
751 | pdata->x_max ? : MAX_12BIT, | |
752 | 0, 0); | |
753 | input_set_abs_params(input_dev, ABS_Y, | |
754 | pdata->y_min ? : 0, | |
755 | pdata->y_max ? : MAX_12BIT, | |
756 | 0, 0); | |
757 | input_set_abs_params(input_dev, ABS_PRESSURE, | |
758 | pdata->pressure_min, pdata->pressure_max, 0, 0); | |
759 | ||
760 | ad7877_write(spi, AD7877_REG_SEQ1, AD7877_MM_SEQUENCE); | |
761 | ||
762 | verify = ad7877_read(spi, AD7877_REG_SEQ1); | |
763 | ||
764 | if (verify != AD7877_MM_SEQUENCE){ | |
765 | dev_err(&spi->dev, "%s: Failed to probe %s\n", | |
766 | dev_name(&spi->dev), input_dev->name); | |
767 | err = -ENODEV; | |
768 | goto err_free_mem; | |
769 | } | |
770 | ||
771 | if (gpio3) | |
772 | ad7877_write(spi, AD7877_REG_EXTWRITE, AD7877_EXTW_GPIO_3_CONF); | |
773 | ||
774 | ad7877_setup_ts_def_msg(spi, ts); | |
775 | ||
776 | /* Request AD7877 /DAV GPIO interrupt */ | |
777 | ||
b534422b DT |
778 | err = request_threaded_irq(spi->irq, NULL, ad7877_irq, |
779 | IRQF_TRIGGER_FALLING | IRQF_ONESHOT, | |
780 | spi->dev.driver->name, ts); | |
331b78ed MH |
781 | if (err) { |
782 | dev_dbg(&spi->dev, "irq %d busy?\n", spi->irq); | |
783 | goto err_free_mem; | |
784 | } | |
785 | ||
786 | err = sysfs_create_group(&spi->dev.kobj, &ad7877_attr_group); | |
787 | if (err) | |
788 | goto err_free_irq; | |
789 | ||
331b78ed MH |
790 | err = input_register_device(input_dev); |
791 | if (err) | |
2fd18aba | 792 | goto err_remove_attr_group; |
331b78ed MH |
793 | |
794 | return 0; | |
795 | ||
331b78ed MH |
796 | err_remove_attr_group: |
797 | sysfs_remove_group(&spi->dev.kobj, &ad7877_attr_group); | |
798 | err_free_irq: | |
799 | free_irq(spi->irq, ts); | |
800 | err_free_mem: | |
801 | input_free_device(input_dev); | |
802 | kfree(ts); | |
331b78ed MH |
803 | return err; |
804 | } | |
805 | ||
e2619cf7 | 806 | static int ad7877_remove(struct spi_device *spi) |
331b78ed | 807 | { |
e1793c69 | 808 | struct ad7877 *ts = spi_get_drvdata(spi); |
331b78ed MH |
809 | |
810 | sysfs_remove_group(&spi->dev.kobj, &ad7877_attr_group); | |
331b78ed MH |
811 | |
812 | ad7877_disable(ts); | |
813 | free_irq(ts->spi->irq, ts); | |
814 | ||
815 | input_unregister_device(ts->input); | |
816 | kfree(ts); | |
817 | ||
818 | dev_dbg(&spi->dev, "unregistered touchscreen\n"); | |
331b78ed MH |
819 | |
820 | return 0; | |
821 | } | |
822 | ||
02b6a58b | 823 | static int __maybe_unused ad7877_suspend(struct device *dev) |
331b78ed | 824 | { |
fccdd7c4 | 825 | struct ad7877 *ts = dev_get_drvdata(dev); |
331b78ed MH |
826 | |
827 | ad7877_disable(ts); | |
828 | ||
829 | return 0; | |
830 | } | |
831 | ||
02b6a58b | 832 | static int __maybe_unused ad7877_resume(struct device *dev) |
331b78ed | 833 | { |
fccdd7c4 | 834 | struct ad7877 *ts = dev_get_drvdata(dev); |
331b78ed MH |
835 | |
836 | ad7877_enable(ts); | |
837 | ||
838 | return 0; | |
839 | } | |
331b78ed | 840 | |
fccdd7c4 MB |
841 | static SIMPLE_DEV_PM_OPS(ad7877_pm, ad7877_suspend, ad7877_resume); |
842 | ||
331b78ed MH |
843 | static struct spi_driver ad7877_driver = { |
844 | .driver = { | |
845 | .name = "ad7877", | |
fccdd7c4 | 846 | .pm = &ad7877_pm, |
331b78ed MH |
847 | }, |
848 | .probe = ad7877_probe, | |
1cb0aa88 | 849 | .remove = ad7877_remove, |
331b78ed MH |
850 | }; |
851 | ||
ca83922e | 852 | module_spi_driver(ad7877_driver); |
331b78ed MH |
853 | |
854 | MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>"); | |
855 | MODULE_DESCRIPTION("AD7877 touchscreen Driver"); | |
856 | MODULE_LICENSE("GPL"); | |
e0626e38 | 857 | MODULE_ALIAS("spi:ad7877"); |