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b7b06f8b | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
331b78ed MH |
2 | /* |
3 | * Copyright (C) 2006-2008 Michael Hennerich, Analog Devices Inc. | |
4 | * | |
5 | * Description: AD7877 based touchscreen, sensor (ADCs), DAC and GPIO driver | |
6 | * Based on: ads7846.c | |
7 | * | |
8 | * Bugs: Enter bugs at http://blackfin.uclinux.org/ | |
9 | * | |
331b78ed MH |
10 | * History: |
11 | * Copyright (c) 2005 David Brownell | |
12 | * Copyright (c) 2006 Nokia Corporation | |
13 | * Various changes: Imre Deak <imre.deak@nokia.com> | |
14 | * | |
15 | * Using code from: | |
16 | * - corgi_ts.c | |
17 | * Copyright (C) 2004-2005 Richard Purdie | |
18 | * - omap_ts.[hc], ads7846.h, ts_osk.c | |
19 | * Copyright (C) 2002 MontaVista Software | |
20 | * Copyright (C) 2004 Texas Instruments | |
21 | * Copyright (C) 2005 Dirk Behme | |
22 | */ | |
23 | ||
24 | ||
25 | #include <linux/device.h> | |
331b78ed MH |
26 | #include <linux/delay.h> |
27 | #include <linux/input.h> | |
28 | #include <linux/interrupt.h> | |
fccdd7c4 | 29 | #include <linux/pm.h> |
331b78ed MH |
30 | #include <linux/slab.h> |
31 | #include <linux/spi/spi.h> | |
32 | #include <linux/spi/ad7877.h> | |
d2d8442d | 33 | #include <linux/module.h> |
331b78ed MH |
34 | #include <asm/irq.h> |
35 | ||
4eb6f91b | 36 | #define TS_PEN_UP_TIMEOUT msecs_to_jiffies(100) |
331b78ed MH |
37 | |
38 | #define MAX_SPI_FREQ_HZ 20000000 | |
39 | #define MAX_12BIT ((1<<12)-1) | |
40 | ||
41 | #define AD7877_REG_ZEROS 0 | |
42 | #define AD7877_REG_CTRL1 1 | |
43 | #define AD7877_REG_CTRL2 2 | |
44 | #define AD7877_REG_ALERT 3 | |
45 | #define AD7877_REG_AUX1HIGH 4 | |
46 | #define AD7877_REG_AUX1LOW 5 | |
47 | #define AD7877_REG_BAT1HIGH 6 | |
48 | #define AD7877_REG_BAT1LOW 7 | |
49 | #define AD7877_REG_BAT2HIGH 8 | |
50 | #define AD7877_REG_BAT2LOW 9 | |
51 | #define AD7877_REG_TEMP1HIGH 10 | |
52 | #define AD7877_REG_TEMP1LOW 11 | |
53 | #define AD7877_REG_SEQ0 12 | |
54 | #define AD7877_REG_SEQ1 13 | |
55 | #define AD7877_REG_DAC 14 | |
56 | #define AD7877_REG_NONE1 15 | |
57 | #define AD7877_REG_EXTWRITE 15 | |
58 | #define AD7877_REG_XPLUS 16 | |
59 | #define AD7877_REG_YPLUS 17 | |
60 | #define AD7877_REG_Z2 18 | |
61 | #define AD7877_REG_aux1 19 | |
62 | #define AD7877_REG_aux2 20 | |
63 | #define AD7877_REG_aux3 21 | |
64 | #define AD7877_REG_bat1 22 | |
65 | #define AD7877_REG_bat2 23 | |
66 | #define AD7877_REG_temp1 24 | |
67 | #define AD7877_REG_temp2 25 | |
68 | #define AD7877_REG_Z1 26 | |
69 | #define AD7877_REG_GPIOCTRL1 27 | |
70 | #define AD7877_REG_GPIOCTRL2 28 | |
71 | #define AD7877_REG_GPIODATA 29 | |
72 | #define AD7877_REG_NONE2 30 | |
73 | #define AD7877_REG_NONE3 31 | |
74 | ||
75 | #define AD7877_SEQ_YPLUS_BIT (1<<11) | |
76 | #define AD7877_SEQ_XPLUS_BIT (1<<10) | |
77 | #define AD7877_SEQ_Z2_BIT (1<<9) | |
78 | #define AD7877_SEQ_AUX1_BIT (1<<8) | |
79 | #define AD7877_SEQ_AUX2_BIT (1<<7) | |
80 | #define AD7877_SEQ_AUX3_BIT (1<<6) | |
81 | #define AD7877_SEQ_BAT1_BIT (1<<5) | |
82 | #define AD7877_SEQ_BAT2_BIT (1<<4) | |
83 | #define AD7877_SEQ_TEMP1_BIT (1<<3) | |
84 | #define AD7877_SEQ_TEMP2_BIT (1<<2) | |
85 | #define AD7877_SEQ_Z1_BIT (1<<1) | |
86 | ||
87 | enum { | |
88 | AD7877_SEQ_YPOS = 0, | |
89 | AD7877_SEQ_XPOS = 1, | |
90 | AD7877_SEQ_Z2 = 2, | |
91 | AD7877_SEQ_AUX1 = 3, | |
92 | AD7877_SEQ_AUX2 = 4, | |
93 | AD7877_SEQ_AUX3 = 5, | |
94 | AD7877_SEQ_BAT1 = 6, | |
95 | AD7877_SEQ_BAT2 = 7, | |
96 | AD7877_SEQ_TEMP1 = 8, | |
97 | AD7877_SEQ_TEMP2 = 9, | |
98 | AD7877_SEQ_Z1 = 10, | |
99 | AD7877_NR_SENSE = 11, | |
100 | }; | |
101 | ||
102 | /* DAC Register Default RANGE 0 to Vcc, Volatge Mode, DAC On */ | |
103 | #define AD7877_DAC_CONF 0x1 | |
104 | ||
105 | /* If gpio3 is set AUX3/GPIO3 acts as GPIO Output */ | |
106 | #define AD7877_EXTW_GPIO_3_CONF 0x1C4 | |
107 | #define AD7877_EXTW_GPIO_DATA 0x200 | |
108 | ||
109 | /* Control REG 2 */ | |
110 | #define AD7877_TMR(x) ((x & 0x3) << 0) | |
111 | #define AD7877_REF(x) ((x & 0x1) << 2) | |
112 | #define AD7877_POL(x) ((x & 0x1) << 3) | |
113 | #define AD7877_FCD(x) ((x & 0x3) << 4) | |
114 | #define AD7877_PM(x) ((x & 0x3) << 6) | |
115 | #define AD7877_ACQ(x) ((x & 0x3) << 8) | |
116 | #define AD7877_AVG(x) ((x & 0x3) << 10) | |
117 | ||
118 | /* Control REG 1 */ | |
119 | #define AD7877_SER (1 << 11) /* non-differential */ | |
120 | #define AD7877_DFR (0 << 11) /* differential */ | |
121 | ||
122 | #define AD7877_MODE_NOC (0) /* Do not convert */ | |
123 | #define AD7877_MODE_SCC (1) /* Single channel conversion */ | |
124 | #define AD7877_MODE_SEQ0 (2) /* Sequence 0 in Slave Mode */ | |
125 | #define AD7877_MODE_SEQ1 (3) /* Sequence 1 in Master Mode */ | |
126 | ||
127 | #define AD7877_CHANADD(x) ((x&0xF)<<7) | |
128 | #define AD7877_READADD(x) ((x)<<2) | |
129 | #define AD7877_WRITEADD(x) ((x)<<12) | |
130 | ||
131 | #define AD7877_READ_CHAN(x) (AD7877_WRITEADD(AD7877_REG_CTRL1) | AD7877_SER | \ | |
132 | AD7877_MODE_SCC | AD7877_CHANADD(AD7877_REG_ ## x) | \ | |
133 | AD7877_READADD(AD7877_REG_ ## x)) | |
134 | ||
135 | #define AD7877_MM_SEQUENCE (AD7877_SEQ_YPLUS_BIT | AD7877_SEQ_XPLUS_BIT | \ | |
136 | AD7877_SEQ_Z2_BIT | AD7877_SEQ_Z1_BIT) | |
137 | ||
138 | /* | |
139 | * Non-touchscreen sensors only use single-ended conversions. | |
140 | */ | |
141 | ||
142 | struct ser_req { | |
143 | u16 reset; | |
144 | u16 ref_on; | |
145 | u16 command; | |
331b78ed MH |
146 | struct spi_message msg; |
147 | struct spi_transfer xfer[6]; | |
3843384a OS |
148 | |
149 | /* | |
150 | * DMA (thus cache coherency maintenance) requires the | |
151 | * transfer buffers to live in their own cache lines. | |
152 | */ | |
153 | u16 sample ____cacheline_aligned; | |
331b78ed MH |
154 | }; |
155 | ||
156 | struct ad7877 { | |
157 | struct input_dev *input; | |
158 | char phys[32]; | |
159 | ||
160 | struct spi_device *spi; | |
161 | u16 model; | |
162 | u16 vref_delay_usecs; | |
163 | u16 x_plate_ohms; | |
164 | u16 pressure_max; | |
165 | ||
166 | u16 cmd_crtl1; | |
167 | u16 cmd_crtl2; | |
168 | u16 cmd_dummy; | |
169 | u16 dac; | |
170 | ||
171 | u8 stopacq_polarity; | |
172 | u8 first_conversion_delay; | |
173 | u8 acquisition_time; | |
174 | u8 averaging; | |
175 | u8 pen_down_acc_interval; | |
176 | ||
331b78ed MH |
177 | struct spi_transfer xfer[AD7877_NR_SENSE + 2]; |
178 | struct spi_message msg; | |
179 | ||
180 | struct mutex mutex; | |
b534422b DT |
181 | bool disabled; /* P: mutex */ |
182 | bool gpio3; /* P: mutex */ | |
183 | bool gpio4; /* P: mutex */ | |
331b78ed MH |
184 | |
185 | spinlock_t lock; | |
186 | struct timer_list timer; /* P: lock */ | |
3843384a OS |
187 | |
188 | /* | |
189 | * DMA (thus cache coherency maintenance) requires the | |
190 | * transfer buffers to live in their own cache lines. | |
191 | */ | |
192 | u16 conversion_data[AD7877_NR_SENSE] ____cacheline_aligned; | |
331b78ed MH |
193 | }; |
194 | ||
2fd18aba DT |
195 | static bool gpio3; |
196 | module_param(gpio3, bool, 0); | |
331b78ed MH |
197 | MODULE_PARM_DESC(gpio3, "If gpio3 is set to 1 AUX3 acts as GPIO3"); |
198 | ||
331b78ed MH |
199 | static int ad7877_read(struct spi_device *spi, u16 reg) |
200 | { | |
201 | struct ser_req *req; | |
202 | int status, ret; | |
203 | ||
204 | req = kzalloc(sizeof *req, GFP_KERNEL); | |
205 | if (!req) | |
206 | return -ENOMEM; | |
207 | ||
208 | spi_message_init(&req->msg); | |
209 | ||
210 | req->command = (u16) (AD7877_WRITEADD(AD7877_REG_CTRL1) | | |
211 | AD7877_READADD(reg)); | |
212 | req->xfer[0].tx_buf = &req->command; | |
213 | req->xfer[0].len = 2; | |
e92c27fb | 214 | req->xfer[0].cs_change = 1; |
331b78ed MH |
215 | |
216 | req->xfer[1].rx_buf = &req->sample; | |
217 | req->xfer[1].len = 2; | |
218 | ||
219 | spi_message_add_tail(&req->xfer[0], &req->msg); | |
220 | spi_message_add_tail(&req->xfer[1], &req->msg); | |
221 | ||
222 | status = spi_sync(spi, &req->msg); | |
223 | ret = status ? : req->sample; | |
224 | ||
225 | kfree(req); | |
226 | ||
227 | return ret; | |
228 | } | |
229 | ||
230 | static int ad7877_write(struct spi_device *spi, u16 reg, u16 val) | |
231 | { | |
232 | struct ser_req *req; | |
233 | int status; | |
234 | ||
235 | req = kzalloc(sizeof *req, GFP_KERNEL); | |
236 | if (!req) | |
237 | return -ENOMEM; | |
238 | ||
239 | spi_message_init(&req->msg); | |
240 | ||
241 | req->command = (u16) (AD7877_WRITEADD(reg) | (val & MAX_12BIT)); | |
242 | req->xfer[0].tx_buf = &req->command; | |
243 | req->xfer[0].len = 2; | |
244 | ||
245 | spi_message_add_tail(&req->xfer[0], &req->msg); | |
246 | ||
247 | status = spi_sync(spi, &req->msg); | |
248 | ||
249 | kfree(req); | |
250 | ||
251 | return status; | |
252 | } | |
253 | ||
254 | static int ad7877_read_adc(struct spi_device *spi, unsigned command) | |
255 | { | |
e1793c69 | 256 | struct ad7877 *ts = spi_get_drvdata(spi); |
331b78ed MH |
257 | struct ser_req *req; |
258 | int status; | |
259 | int sample; | |
260 | int i; | |
261 | ||
262 | req = kzalloc(sizeof *req, GFP_KERNEL); | |
263 | if (!req) | |
264 | return -ENOMEM; | |
265 | ||
266 | spi_message_init(&req->msg); | |
267 | ||
268 | /* activate reference, so it has time to settle; */ | |
269 | req->ref_on = AD7877_WRITEADD(AD7877_REG_CTRL2) | | |
270 | AD7877_POL(ts->stopacq_polarity) | | |
271 | AD7877_AVG(0) | AD7877_PM(2) | AD7877_TMR(0) | | |
272 | AD7877_ACQ(ts->acquisition_time) | AD7877_FCD(0); | |
273 | ||
274 | req->reset = AD7877_WRITEADD(AD7877_REG_CTRL1) | AD7877_MODE_NOC; | |
275 | ||
276 | req->command = (u16) command; | |
277 | ||
278 | req->xfer[0].tx_buf = &req->reset; | |
279 | req->xfer[0].len = 2; | |
e92c27fb | 280 | req->xfer[0].cs_change = 1; |
331b78ed MH |
281 | |
282 | req->xfer[1].tx_buf = &req->ref_on; | |
283 | req->xfer[1].len = 2; | |
6782b5da SC |
284 | req->xfer[1].delay.value = ts->vref_delay_usecs; |
285 | req->xfer[1].delay.unit = SPI_DELAY_UNIT_USECS; | |
e92c27fb | 286 | req->xfer[1].cs_change = 1; |
331b78ed MH |
287 | |
288 | req->xfer[2].tx_buf = &req->command; | |
289 | req->xfer[2].len = 2; | |
6782b5da SC |
290 | req->xfer[2].delay.value = ts->vref_delay_usecs; |
291 | req->xfer[2].delay.unit = SPI_DELAY_UNIT_USECS; | |
e92c27fb | 292 | req->xfer[2].cs_change = 1; |
331b78ed MH |
293 | |
294 | req->xfer[3].rx_buf = &req->sample; | |
295 | req->xfer[3].len = 2; | |
e92c27fb | 296 | req->xfer[3].cs_change = 1; |
331b78ed MH |
297 | |
298 | req->xfer[4].tx_buf = &ts->cmd_crtl2; /*REF OFF*/ | |
299 | req->xfer[4].len = 2; | |
e92c27fb | 300 | req->xfer[4].cs_change = 1; |
331b78ed MH |
301 | |
302 | req->xfer[5].tx_buf = &ts->cmd_crtl1; /*DEFAULT*/ | |
303 | req->xfer[5].len = 2; | |
304 | ||
305 | /* group all the transfers together, so we can't interfere with | |
306 | * reading touchscreen state; disable penirq while sampling | |
307 | */ | |
308 | for (i = 0; i < 6; i++) | |
309 | spi_message_add_tail(&req->xfer[i], &req->msg); | |
310 | ||
311 | status = spi_sync(spi, &req->msg); | |
312 | sample = req->sample; | |
313 | ||
314 | kfree(req); | |
315 | ||
316 | return status ? : sample; | |
317 | } | |
318 | ||
b534422b | 319 | static int ad7877_process_data(struct ad7877 *ts) |
331b78ed MH |
320 | { |
321 | struct input_dev *input_dev = ts->input; | |
322 | unsigned Rt; | |
323 | u16 x, y, z1, z2; | |
324 | ||
325 | x = ts->conversion_data[AD7877_SEQ_XPOS] & MAX_12BIT; | |
326 | y = ts->conversion_data[AD7877_SEQ_YPOS] & MAX_12BIT; | |
327 | z1 = ts->conversion_data[AD7877_SEQ_Z1] & MAX_12BIT; | |
328 | z2 = ts->conversion_data[AD7877_SEQ_Z2] & MAX_12BIT; | |
329 | ||
330 | /* | |
331 | * The samples processed here are already preprocessed by the AD7877. | |
332 | * The preprocessing function consists of an averaging filter. | |
333 | * The combination of 'first conversion delay' and averaging provides a robust solution, | |
334 | * discarding the spurious noise in the signal and keeping only the data of interest. | |
335 | * The size of the averaging filter is programmable. (dev.platform_data, see linux/spi/ad7877.h) | |
336 | * Other user-programmable conversion controls include variable acquisition time, | |
337 | * and first conversion delay. Up to 16 averages can be taken per conversion. | |
338 | */ | |
339 | ||
340 | if (likely(x && z1)) { | |
341 | /* compute touch pressure resistance using equation #1 */ | |
342 | Rt = (z2 - z1) * x * ts->x_plate_ohms; | |
343 | Rt /= z1; | |
344 | Rt = (Rt + 2047) >> 12; | |
345 | ||
1d02ad43 MH |
346 | /* |
347 | * Sample found inconsistent, pressure is beyond | |
348 | * the maximum. Don't report it to user space. | |
349 | */ | |
350 | if (Rt > ts->pressure_max) | |
351 | return -EINVAL; | |
352 | ||
47026b25 MH |
353 | if (!timer_pending(&ts->timer)) |
354 | input_report_key(input_dev, BTN_TOUCH, 1); | |
355 | ||
331b78ed MH |
356 | input_report_abs(input_dev, ABS_X, x); |
357 | input_report_abs(input_dev, ABS_Y, y); | |
358 | input_report_abs(input_dev, ABS_PRESSURE, Rt); | |
359 | input_sync(input_dev); | |
b534422b | 360 | |
47026b25 | 361 | return 0; |
331b78ed | 362 | } |
47026b25 MH |
363 | |
364 | return -EINVAL; | |
331b78ed MH |
365 | } |
366 | ||
367 | static inline void ad7877_ts_event_release(struct ad7877 *ts) | |
368 | { | |
369 | struct input_dev *input_dev = ts->input; | |
370 | ||
371 | input_report_abs(input_dev, ABS_PRESSURE, 0); | |
47026b25 | 372 | input_report_key(input_dev, BTN_TOUCH, 0); |
331b78ed MH |
373 | input_sync(input_dev); |
374 | } | |
375 | ||
8446b32b | 376 | static void ad7877_timer(struct timer_list *t) |
331b78ed | 377 | { |
8446b32b | 378 | struct ad7877 *ts = from_timer(ts, t, timer); |
b534422b | 379 | unsigned long flags; |
331b78ed | 380 | |
b534422b | 381 | spin_lock_irqsave(&ts->lock, flags); |
331b78ed | 382 | ad7877_ts_event_release(ts); |
b534422b | 383 | spin_unlock_irqrestore(&ts->lock, flags); |
331b78ed MH |
384 | } |
385 | ||
386 | static irqreturn_t ad7877_irq(int irq, void *handle) | |
387 | { | |
388 | struct ad7877 *ts = handle; | |
389 | unsigned long flags; | |
b534422b | 390 | int error; |
331b78ed | 391 | |
b534422b DT |
392 | error = spi_sync(ts->spi, &ts->msg); |
393 | if (error) { | |
394 | dev_err(&ts->spi->dev, "spi_sync --> %d\n", error); | |
395 | goto out; | |
396 | } | |
331b78ed MH |
397 | |
398 | spin_lock_irqsave(&ts->lock, flags); | |
b534422b DT |
399 | error = ad7877_process_data(ts); |
400 | if (!error) | |
401 | mod_timer(&ts->timer, jiffies + TS_PEN_UP_TIMEOUT); | |
331b78ed MH |
402 | spin_unlock_irqrestore(&ts->lock, flags); |
403 | ||
b534422b | 404 | out: |
331b78ed MH |
405 | return IRQ_HANDLED; |
406 | } | |
407 | ||
fbe6a536 | 408 | static void ad7877_disable(void *data) |
331b78ed | 409 | { |
fbe6a536 AS |
410 | struct ad7877 *ts = data; |
411 | ||
331b78ed MH |
412 | mutex_lock(&ts->mutex); |
413 | ||
414 | if (!ts->disabled) { | |
b534422b | 415 | ts->disabled = true; |
331b78ed MH |
416 | disable_irq(ts->spi->irq); |
417 | ||
331b78ed MH |
418 | if (del_timer_sync(&ts->timer)) |
419 | ad7877_ts_event_release(ts); | |
420 | } | |
421 | ||
b534422b DT |
422 | /* |
423 | * We know the chip's in lowpower mode since we always | |
331b78ed MH |
424 | * leave it that way after every request |
425 | */ | |
426 | ||
427 | mutex_unlock(&ts->mutex); | |
428 | } | |
429 | ||
430 | static void ad7877_enable(struct ad7877 *ts) | |
431 | { | |
432 | mutex_lock(&ts->mutex); | |
433 | ||
434 | if (ts->disabled) { | |
b534422b | 435 | ts->disabled = false; |
331b78ed MH |
436 | enable_irq(ts->spi->irq); |
437 | } | |
438 | ||
439 | mutex_unlock(&ts->mutex); | |
440 | } | |
441 | ||
442 | #define SHOW(name) static ssize_t \ | |
443 | name ## _show(struct device *dev, struct device_attribute *attr, char *buf) \ | |
444 | { \ | |
2fd18aba | 445 | struct ad7877 *ts = dev_get_drvdata(dev); \ |
331b78ed MH |
446 | ssize_t v = ad7877_read_adc(ts->spi, \ |
447 | AD7877_READ_CHAN(name)); \ | |
448 | if (v < 0) \ | |
449 | return v; \ | |
450 | return sprintf(buf, "%u\n", (unsigned) v); \ | |
451 | } \ | |
452 | static DEVICE_ATTR(name, S_IRUGO, name ## _show, NULL); | |
453 | ||
454 | SHOW(aux1) | |
455 | SHOW(aux2) | |
456 | SHOW(aux3) | |
457 | SHOW(bat1) | |
458 | SHOW(bat2) | |
459 | SHOW(temp1) | |
460 | SHOW(temp2) | |
461 | ||
462 | static ssize_t ad7877_disable_show(struct device *dev, | |
463 | struct device_attribute *attr, char *buf) | |
464 | { | |
2fd18aba | 465 | struct ad7877 *ts = dev_get_drvdata(dev); |
331b78ed MH |
466 | |
467 | return sprintf(buf, "%u\n", ts->disabled); | |
468 | } | |
469 | ||
470 | static ssize_t ad7877_disable_store(struct device *dev, | |
471 | struct device_attribute *attr, | |
472 | const char *buf, size_t count) | |
473 | { | |
474 | struct ad7877 *ts = dev_get_drvdata(dev); | |
76496e7a | 475 | unsigned int val; |
331b78ed MH |
476 | int error; |
477 | ||
76496e7a | 478 | error = kstrtouint(buf, 10, &val); |
331b78ed MH |
479 | if (error) |
480 | return error; | |
481 | ||
482 | if (val) | |
483 | ad7877_disable(ts); | |
484 | else | |
485 | ad7877_enable(ts); | |
486 | ||
487 | return count; | |
488 | } | |
489 | ||
490 | static DEVICE_ATTR(disable, 0664, ad7877_disable_show, ad7877_disable_store); | |
491 | ||
492 | static ssize_t ad7877_dac_show(struct device *dev, | |
493 | struct device_attribute *attr, char *buf) | |
494 | { | |
2fd18aba | 495 | struct ad7877 *ts = dev_get_drvdata(dev); |
331b78ed MH |
496 | |
497 | return sprintf(buf, "%u\n", ts->dac); | |
498 | } | |
499 | ||
500 | static ssize_t ad7877_dac_store(struct device *dev, | |
501 | struct device_attribute *attr, | |
502 | const char *buf, size_t count) | |
503 | { | |
504 | struct ad7877 *ts = dev_get_drvdata(dev); | |
76496e7a | 505 | unsigned int val; |
331b78ed MH |
506 | int error; |
507 | ||
76496e7a | 508 | error = kstrtouint(buf, 10, &val); |
331b78ed MH |
509 | if (error) |
510 | return error; | |
511 | ||
512 | mutex_lock(&ts->mutex); | |
513 | ts->dac = val & 0xFF; | |
514 | ad7877_write(ts->spi, AD7877_REG_DAC, (ts->dac << 4) | AD7877_DAC_CONF); | |
515 | mutex_unlock(&ts->mutex); | |
516 | ||
517 | return count; | |
518 | } | |
519 | ||
520 | static DEVICE_ATTR(dac, 0664, ad7877_dac_show, ad7877_dac_store); | |
521 | ||
522 | static ssize_t ad7877_gpio3_show(struct device *dev, | |
523 | struct device_attribute *attr, char *buf) | |
524 | { | |
2fd18aba | 525 | struct ad7877 *ts = dev_get_drvdata(dev); |
331b78ed MH |
526 | |
527 | return sprintf(buf, "%u\n", ts->gpio3); | |
528 | } | |
529 | ||
530 | static ssize_t ad7877_gpio3_store(struct device *dev, | |
531 | struct device_attribute *attr, | |
532 | const char *buf, size_t count) | |
533 | { | |
534 | struct ad7877 *ts = dev_get_drvdata(dev); | |
76496e7a | 535 | unsigned int val; |
331b78ed MH |
536 | int error; |
537 | ||
76496e7a | 538 | error = kstrtouint(buf, 10, &val); |
331b78ed MH |
539 | if (error) |
540 | return error; | |
541 | ||
542 | mutex_lock(&ts->mutex); | |
543 | ts->gpio3 = !!val; | |
544 | ad7877_write(ts->spi, AD7877_REG_EXTWRITE, AD7877_EXTW_GPIO_DATA | | |
545 | (ts->gpio4 << 4) | (ts->gpio3 << 5)); | |
546 | mutex_unlock(&ts->mutex); | |
547 | ||
548 | return count; | |
549 | } | |
550 | ||
551 | static DEVICE_ATTR(gpio3, 0664, ad7877_gpio3_show, ad7877_gpio3_store); | |
552 | ||
553 | static ssize_t ad7877_gpio4_show(struct device *dev, | |
554 | struct device_attribute *attr, char *buf) | |
555 | { | |
2fd18aba | 556 | struct ad7877 *ts = dev_get_drvdata(dev); |
331b78ed MH |
557 | |
558 | return sprintf(buf, "%u\n", ts->gpio4); | |
559 | } | |
560 | ||
561 | static ssize_t ad7877_gpio4_store(struct device *dev, | |
562 | struct device_attribute *attr, | |
563 | const char *buf, size_t count) | |
564 | { | |
565 | struct ad7877 *ts = dev_get_drvdata(dev); | |
76496e7a | 566 | unsigned int val; |
331b78ed MH |
567 | int error; |
568 | ||
76496e7a | 569 | error = kstrtouint(buf, 10, &val); |
331b78ed MH |
570 | if (error) |
571 | return error; | |
572 | ||
573 | mutex_lock(&ts->mutex); | |
574 | ts->gpio4 = !!val; | |
575 | ad7877_write(ts->spi, AD7877_REG_EXTWRITE, AD7877_EXTW_GPIO_DATA | | |
576 | (ts->gpio4 << 4) | (ts->gpio3 << 5)); | |
577 | mutex_unlock(&ts->mutex); | |
578 | ||
579 | return count; | |
580 | } | |
581 | ||
582 | static DEVICE_ATTR(gpio4, 0664, ad7877_gpio4_show, ad7877_gpio4_store); | |
583 | ||
584 | static struct attribute *ad7877_attributes[] = { | |
585 | &dev_attr_temp1.attr, | |
586 | &dev_attr_temp2.attr, | |
587 | &dev_attr_aux1.attr, | |
588 | &dev_attr_aux2.attr, | |
2fd18aba | 589 | &dev_attr_aux3.attr, |
331b78ed MH |
590 | &dev_attr_bat1.attr, |
591 | &dev_attr_bat2.attr, | |
592 | &dev_attr_disable.attr, | |
593 | &dev_attr_dac.attr, | |
2fd18aba | 594 | &dev_attr_gpio3.attr, |
331b78ed MH |
595 | &dev_attr_gpio4.attr, |
596 | NULL | |
597 | }; | |
598 | ||
587a1f16 | 599 | static umode_t ad7877_attr_is_visible(struct kobject *kobj, |
2fd18aba DT |
600 | struct attribute *attr, int n) |
601 | { | |
587a1f16 | 602 | umode_t mode = attr->mode; |
2fd18aba DT |
603 | |
604 | if (attr == &dev_attr_aux3.attr) { | |
605 | if (gpio3) | |
606 | mode = 0; | |
607 | } else if (attr == &dev_attr_gpio3.attr) { | |
608 | if (!gpio3) | |
609 | mode = 0; | |
610 | } | |
611 | ||
612 | return mode; | |
613 | } | |
614 | ||
e86253d9 | 615 | static const struct attribute_group ad7877_group = { |
2fd18aba DT |
616 | .is_visible = ad7877_attr_is_visible, |
617 | .attrs = ad7877_attributes, | |
331b78ed | 618 | }; |
e86253d9 | 619 | __ATTRIBUTE_GROUPS(ad7877); |
331b78ed MH |
620 | |
621 | static void ad7877_setup_ts_def_msg(struct spi_device *spi, struct ad7877 *ts) | |
622 | { | |
623 | struct spi_message *m; | |
624 | int i; | |
625 | ||
626 | ts->cmd_crtl2 = AD7877_WRITEADD(AD7877_REG_CTRL2) | | |
627 | AD7877_POL(ts->stopacq_polarity) | | |
628 | AD7877_AVG(ts->averaging) | AD7877_PM(1) | | |
629 | AD7877_TMR(ts->pen_down_acc_interval) | | |
630 | AD7877_ACQ(ts->acquisition_time) | | |
631 | AD7877_FCD(ts->first_conversion_delay); | |
632 | ||
633 | ad7877_write(spi, AD7877_REG_CTRL2, ts->cmd_crtl2); | |
634 | ||
635 | ts->cmd_crtl1 = AD7877_WRITEADD(AD7877_REG_CTRL1) | | |
636 | AD7877_READADD(AD7877_REG_XPLUS-1) | | |
637 | AD7877_MODE_SEQ1 | AD7877_DFR; | |
638 | ||
639 | ad7877_write(spi, AD7877_REG_CTRL1, ts->cmd_crtl1); | |
640 | ||
641 | ts->cmd_dummy = 0; | |
642 | ||
643 | m = &ts->msg; | |
644 | ||
645 | spi_message_init(m); | |
646 | ||
331b78ed MH |
647 | m->context = ts; |
648 | ||
649 | ts->xfer[0].tx_buf = &ts->cmd_crtl1; | |
650 | ts->xfer[0].len = 2; | |
e92c27fb | 651 | ts->xfer[0].cs_change = 1; |
331b78ed MH |
652 | |
653 | spi_message_add_tail(&ts->xfer[0], m); | |
654 | ||
655 | ts->xfer[1].tx_buf = &ts->cmd_dummy; /* Send ZERO */ | |
656 | ts->xfer[1].len = 2; | |
e92c27fb | 657 | ts->xfer[1].cs_change = 1; |
331b78ed MH |
658 | |
659 | spi_message_add_tail(&ts->xfer[1], m); | |
660 | ||
e92c27fb | 661 | for (i = 0; i < AD7877_NR_SENSE; i++) { |
331b78ed MH |
662 | ts->xfer[i + 2].rx_buf = &ts->conversion_data[AD7877_SEQ_YPOS + i]; |
663 | ts->xfer[i + 2].len = 2; | |
e92c27fb MH |
664 | if (i < (AD7877_NR_SENSE - 1)) |
665 | ts->xfer[i + 2].cs_change = 1; | |
331b78ed MH |
666 | spi_message_add_tail(&ts->xfer[i + 2], m); |
667 | } | |
668 | } | |
669 | ||
5298cc4c | 670 | static int ad7877_probe(struct spi_device *spi) |
331b78ed MH |
671 | { |
672 | struct ad7877 *ts; | |
673 | struct input_dev *input_dev; | |
c838cb3d | 674 | struct ad7877_platform_data *pdata = dev_get_platdata(&spi->dev); |
331b78ed MH |
675 | int err; |
676 | u16 verify; | |
677 | ||
678 | if (!spi->irq) { | |
679 | dev_dbg(&spi->dev, "no IRQ?\n"); | |
680 | return -ENODEV; | |
681 | } | |
682 | ||
683 | if (!pdata) { | |
684 | dev_dbg(&spi->dev, "no platform data?\n"); | |
685 | return -ENODEV; | |
686 | } | |
687 | ||
688 | /* don't exceed max specified SPI CLK frequency */ | |
689 | if (spi->max_speed_hz > MAX_SPI_FREQ_HZ) { | |
690 | dev_dbg(&spi->dev, "SPI CLK %d Hz?\n",spi->max_speed_hz); | |
691 | return -EINVAL; | |
692 | } | |
693 | ||
cd9b6fdf OS |
694 | spi->bits_per_word = 16; |
695 | err = spi_setup(spi); | |
696 | if (err) { | |
697 | dev_dbg(&spi->dev, "spi master doesn't support 16 bits/word\n"); | |
698 | return err; | |
699 | } | |
700 | ||
fbe6a536 AS |
701 | ts = devm_kzalloc(&spi->dev, sizeof(struct ad7877), GFP_KERNEL); |
702 | if (!ts) | |
703 | return -ENOMEM; | |
704 | ||
705 | input_dev = devm_input_allocate_device(&spi->dev); | |
706 | if (!input_dev) | |
707 | return -ENOMEM; | |
708 | ||
709 | err = devm_add_action_or_reset(&spi->dev, ad7877_disable, ts); | |
710 | if (err) | |
711 | return err; | |
331b78ed | 712 | |
e1793c69 | 713 | spi_set_drvdata(spi, ts); |
331b78ed MH |
714 | ts->spi = spi; |
715 | ts->input = input_dev; | |
716 | ||
8446b32b | 717 | timer_setup(&ts->timer, ad7877_timer, 0); |
331b78ed MH |
718 | mutex_init(&ts->mutex); |
719 | spin_lock_init(&ts->lock); | |
720 | ||
721 | ts->model = pdata->model ? : 7877; | |
722 | ts->vref_delay_usecs = pdata->vref_delay_usecs ? : 100; | |
723 | ts->x_plate_ohms = pdata->x_plate_ohms ? : 400; | |
724 | ts->pressure_max = pdata->pressure_max ? : ~0; | |
725 | ||
726 | ts->stopacq_polarity = pdata->stopacq_polarity; | |
727 | ts->first_conversion_delay = pdata->first_conversion_delay; | |
728 | ts->acquisition_time = pdata->acquisition_time; | |
729 | ts->averaging = pdata->averaging; | |
730 | ts->pen_down_acc_interval = pdata->pen_down_acc_interval; | |
731 | ||
732 | snprintf(ts->phys, sizeof(ts->phys), "%s/input0", dev_name(&spi->dev)); | |
733 | ||
734 | input_dev->name = "AD7877 Touchscreen"; | |
735 | input_dev->phys = ts->phys; | |
736 | input_dev->dev.parent = &spi->dev; | |
737 | ||
47026b25 MH |
738 | __set_bit(EV_KEY, input_dev->evbit); |
739 | __set_bit(BTN_TOUCH, input_dev->keybit); | |
331b78ed MH |
740 | __set_bit(EV_ABS, input_dev->evbit); |
741 | __set_bit(ABS_X, input_dev->absbit); | |
742 | __set_bit(ABS_Y, input_dev->absbit); | |
743 | __set_bit(ABS_PRESSURE, input_dev->absbit); | |
744 | ||
745 | input_set_abs_params(input_dev, ABS_X, | |
746 | pdata->x_min ? : 0, | |
747 | pdata->x_max ? : MAX_12BIT, | |
748 | 0, 0); | |
749 | input_set_abs_params(input_dev, ABS_Y, | |
750 | pdata->y_min ? : 0, | |
751 | pdata->y_max ? : MAX_12BIT, | |
752 | 0, 0); | |
753 | input_set_abs_params(input_dev, ABS_PRESSURE, | |
754 | pdata->pressure_min, pdata->pressure_max, 0, 0); | |
755 | ||
756 | ad7877_write(spi, AD7877_REG_SEQ1, AD7877_MM_SEQUENCE); | |
757 | ||
758 | verify = ad7877_read(spi, AD7877_REG_SEQ1); | |
759 | ||
fbe6a536 | 760 | if (verify != AD7877_MM_SEQUENCE) { |
331b78ed MH |
761 | dev_err(&spi->dev, "%s: Failed to probe %s\n", |
762 | dev_name(&spi->dev), input_dev->name); | |
fbe6a536 | 763 | return -ENODEV; |
331b78ed MH |
764 | } |
765 | ||
766 | if (gpio3) | |
767 | ad7877_write(spi, AD7877_REG_EXTWRITE, AD7877_EXTW_GPIO_3_CONF); | |
768 | ||
769 | ad7877_setup_ts_def_msg(spi, ts); | |
770 | ||
771 | /* Request AD7877 /DAV GPIO interrupt */ | |
772 | ||
fbe6a536 AS |
773 | err = devm_request_threaded_irq(&spi->dev, spi->irq, NULL, ad7877_irq, |
774 | IRQF_TRIGGER_FALLING | IRQF_ONESHOT, | |
775 | spi->dev.driver->name, ts); | |
331b78ed MH |
776 | if (err) { |
777 | dev_dbg(&spi->dev, "irq %d busy?\n", spi->irq); | |
fbe6a536 | 778 | return err; |
331b78ed MH |
779 | } |
780 | ||
331b78ed MH |
781 | err = input_register_device(input_dev); |
782 | if (err) | |
fbe6a536 | 783 | return err; |
331b78ed MH |
784 | |
785 | return 0; | |
786 | } | |
787 | ||
458d7343 | 788 | static int ad7877_suspend(struct device *dev) |
331b78ed | 789 | { |
fccdd7c4 | 790 | struct ad7877 *ts = dev_get_drvdata(dev); |
331b78ed MH |
791 | |
792 | ad7877_disable(ts); | |
793 | ||
794 | return 0; | |
795 | } | |
796 | ||
458d7343 | 797 | static int ad7877_resume(struct device *dev) |
331b78ed | 798 | { |
fccdd7c4 | 799 | struct ad7877 *ts = dev_get_drvdata(dev); |
331b78ed MH |
800 | |
801 | ad7877_enable(ts); | |
802 | ||
803 | return 0; | |
804 | } | |
331b78ed | 805 | |
458d7343 | 806 | static DEFINE_SIMPLE_DEV_PM_OPS(ad7877_pm, ad7877_suspend, ad7877_resume); |
fccdd7c4 | 807 | |
331b78ed MH |
808 | static struct spi_driver ad7877_driver = { |
809 | .driver = { | |
e86253d9 DT |
810 | .name = "ad7877", |
811 | .dev_groups = ad7877_groups, | |
812 | .pm = pm_sleep_ptr(&ad7877_pm), | |
331b78ed MH |
813 | }, |
814 | .probe = ad7877_probe, | |
331b78ed MH |
815 | }; |
816 | ||
ca83922e | 817 | module_spi_driver(ad7877_driver); |
331b78ed MH |
818 | |
819 | MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>"); | |
820 | MODULE_DESCRIPTION("AD7877 touchscreen Driver"); | |
821 | MODULE_LICENSE("GPL"); | |
e0626e38 | 822 | MODULE_ALIAS("spi:ad7877"); |