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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> | |
fccdd7c4 | 44 | #include <linux/pm.h> |
331b78ed MH |
45 | #include <linux/slab.h> |
46 | #include <linux/spi/spi.h> | |
47 | #include <linux/spi/ad7877.h> | |
d2d8442d | 48 | #include <linux/module.h> |
331b78ed MH |
49 | #include <asm/irq.h> |
50 | ||
4eb6f91b | 51 | #define TS_PEN_UP_TIMEOUT msecs_to_jiffies(100) |
331b78ed MH |
52 | |
53 | #define MAX_SPI_FREQ_HZ 20000000 | |
54 | #define MAX_12BIT ((1<<12)-1) | |
55 | ||
56 | #define AD7877_REG_ZEROS 0 | |
57 | #define AD7877_REG_CTRL1 1 | |
58 | #define AD7877_REG_CTRL2 2 | |
59 | #define AD7877_REG_ALERT 3 | |
60 | #define AD7877_REG_AUX1HIGH 4 | |
61 | #define AD7877_REG_AUX1LOW 5 | |
62 | #define AD7877_REG_BAT1HIGH 6 | |
63 | #define AD7877_REG_BAT1LOW 7 | |
64 | #define AD7877_REG_BAT2HIGH 8 | |
65 | #define AD7877_REG_BAT2LOW 9 | |
66 | #define AD7877_REG_TEMP1HIGH 10 | |
67 | #define AD7877_REG_TEMP1LOW 11 | |
68 | #define AD7877_REG_SEQ0 12 | |
69 | #define AD7877_REG_SEQ1 13 | |
70 | #define AD7877_REG_DAC 14 | |
71 | #define AD7877_REG_NONE1 15 | |
72 | #define AD7877_REG_EXTWRITE 15 | |
73 | #define AD7877_REG_XPLUS 16 | |
74 | #define AD7877_REG_YPLUS 17 | |
75 | #define AD7877_REG_Z2 18 | |
76 | #define AD7877_REG_aux1 19 | |
77 | #define AD7877_REG_aux2 20 | |
78 | #define AD7877_REG_aux3 21 | |
79 | #define AD7877_REG_bat1 22 | |
80 | #define AD7877_REG_bat2 23 | |
81 | #define AD7877_REG_temp1 24 | |
82 | #define AD7877_REG_temp2 25 | |
83 | #define AD7877_REG_Z1 26 | |
84 | #define AD7877_REG_GPIOCTRL1 27 | |
85 | #define AD7877_REG_GPIOCTRL2 28 | |
86 | #define AD7877_REG_GPIODATA 29 | |
87 | #define AD7877_REG_NONE2 30 | |
88 | #define AD7877_REG_NONE3 31 | |
89 | ||
90 | #define AD7877_SEQ_YPLUS_BIT (1<<11) | |
91 | #define AD7877_SEQ_XPLUS_BIT (1<<10) | |
92 | #define AD7877_SEQ_Z2_BIT (1<<9) | |
93 | #define AD7877_SEQ_AUX1_BIT (1<<8) | |
94 | #define AD7877_SEQ_AUX2_BIT (1<<7) | |
95 | #define AD7877_SEQ_AUX3_BIT (1<<6) | |
96 | #define AD7877_SEQ_BAT1_BIT (1<<5) | |
97 | #define AD7877_SEQ_BAT2_BIT (1<<4) | |
98 | #define AD7877_SEQ_TEMP1_BIT (1<<3) | |
99 | #define AD7877_SEQ_TEMP2_BIT (1<<2) | |
100 | #define AD7877_SEQ_Z1_BIT (1<<1) | |
101 | ||
102 | enum { | |
103 | AD7877_SEQ_YPOS = 0, | |
104 | AD7877_SEQ_XPOS = 1, | |
105 | AD7877_SEQ_Z2 = 2, | |
106 | AD7877_SEQ_AUX1 = 3, | |
107 | AD7877_SEQ_AUX2 = 4, | |
108 | AD7877_SEQ_AUX3 = 5, | |
109 | AD7877_SEQ_BAT1 = 6, | |
110 | AD7877_SEQ_BAT2 = 7, | |
111 | AD7877_SEQ_TEMP1 = 8, | |
112 | AD7877_SEQ_TEMP2 = 9, | |
113 | AD7877_SEQ_Z1 = 10, | |
114 | AD7877_NR_SENSE = 11, | |
115 | }; | |
116 | ||
117 | /* DAC Register Default RANGE 0 to Vcc, Volatge Mode, DAC On */ | |
118 | #define AD7877_DAC_CONF 0x1 | |
119 | ||
120 | /* If gpio3 is set AUX3/GPIO3 acts as GPIO Output */ | |
121 | #define AD7877_EXTW_GPIO_3_CONF 0x1C4 | |
122 | #define AD7877_EXTW_GPIO_DATA 0x200 | |
123 | ||
124 | /* Control REG 2 */ | |
125 | #define AD7877_TMR(x) ((x & 0x3) << 0) | |
126 | #define AD7877_REF(x) ((x & 0x1) << 2) | |
127 | #define AD7877_POL(x) ((x & 0x1) << 3) | |
128 | #define AD7877_FCD(x) ((x & 0x3) << 4) | |
129 | #define AD7877_PM(x) ((x & 0x3) << 6) | |
130 | #define AD7877_ACQ(x) ((x & 0x3) << 8) | |
131 | #define AD7877_AVG(x) ((x & 0x3) << 10) | |
132 | ||
133 | /* Control REG 1 */ | |
134 | #define AD7877_SER (1 << 11) /* non-differential */ | |
135 | #define AD7877_DFR (0 << 11) /* differential */ | |
136 | ||
137 | #define AD7877_MODE_NOC (0) /* Do not convert */ | |
138 | #define AD7877_MODE_SCC (1) /* Single channel conversion */ | |
139 | #define AD7877_MODE_SEQ0 (2) /* Sequence 0 in Slave Mode */ | |
140 | #define AD7877_MODE_SEQ1 (3) /* Sequence 1 in Master Mode */ | |
141 | ||
142 | #define AD7877_CHANADD(x) ((x&0xF)<<7) | |
143 | #define AD7877_READADD(x) ((x)<<2) | |
144 | #define AD7877_WRITEADD(x) ((x)<<12) | |
145 | ||
146 | #define AD7877_READ_CHAN(x) (AD7877_WRITEADD(AD7877_REG_CTRL1) | AD7877_SER | \ | |
147 | AD7877_MODE_SCC | AD7877_CHANADD(AD7877_REG_ ## x) | \ | |
148 | AD7877_READADD(AD7877_REG_ ## x)) | |
149 | ||
150 | #define AD7877_MM_SEQUENCE (AD7877_SEQ_YPLUS_BIT | AD7877_SEQ_XPLUS_BIT | \ | |
151 | AD7877_SEQ_Z2_BIT | AD7877_SEQ_Z1_BIT) | |
152 | ||
153 | /* | |
154 | * Non-touchscreen sensors only use single-ended conversions. | |
155 | */ | |
156 | ||
157 | struct ser_req { | |
158 | u16 reset; | |
159 | u16 ref_on; | |
160 | u16 command; | |
331b78ed MH |
161 | struct spi_message msg; |
162 | struct spi_transfer xfer[6]; | |
3843384a OS |
163 | |
164 | /* | |
165 | * DMA (thus cache coherency maintenance) requires the | |
166 | * transfer buffers to live in their own cache lines. | |
167 | */ | |
168 | u16 sample ____cacheline_aligned; | |
331b78ed MH |
169 | }; |
170 | ||
171 | struct ad7877 { | |
172 | struct input_dev *input; | |
173 | char phys[32]; | |
174 | ||
175 | struct spi_device *spi; | |
176 | u16 model; | |
177 | u16 vref_delay_usecs; | |
178 | u16 x_plate_ohms; | |
179 | u16 pressure_max; | |
180 | ||
181 | u16 cmd_crtl1; | |
182 | u16 cmd_crtl2; | |
183 | u16 cmd_dummy; | |
184 | u16 dac; | |
185 | ||
186 | u8 stopacq_polarity; | |
187 | u8 first_conversion_delay; | |
188 | u8 acquisition_time; | |
189 | u8 averaging; | |
190 | u8 pen_down_acc_interval; | |
191 | ||
331b78ed MH |
192 | struct spi_transfer xfer[AD7877_NR_SENSE + 2]; |
193 | struct spi_message msg; | |
194 | ||
195 | struct mutex mutex; | |
b534422b DT |
196 | bool disabled; /* P: mutex */ |
197 | bool gpio3; /* P: mutex */ | |
198 | bool gpio4; /* P: mutex */ | |
331b78ed MH |
199 | |
200 | spinlock_t lock; | |
201 | struct timer_list timer; /* P: lock */ | |
3843384a OS |
202 | |
203 | /* | |
204 | * DMA (thus cache coherency maintenance) requires the | |
205 | * transfer buffers to live in their own cache lines. | |
206 | */ | |
207 | u16 conversion_data[AD7877_NR_SENSE] ____cacheline_aligned; | |
331b78ed MH |
208 | }; |
209 | ||
2fd18aba DT |
210 | static bool gpio3; |
211 | module_param(gpio3, bool, 0); | |
331b78ed MH |
212 | MODULE_PARM_DESC(gpio3, "If gpio3 is set to 1 AUX3 acts as GPIO3"); |
213 | ||
214 | /* | |
215 | * ad7877_read/write are only used for initial setup and for sysfs controls. | |
216 | * The main traffic is done using spi_async() in the interrupt handler. | |
217 | */ | |
218 | ||
219 | static int ad7877_read(struct spi_device *spi, u16 reg) | |
220 | { | |
221 | struct ser_req *req; | |
222 | int status, ret; | |
223 | ||
224 | req = kzalloc(sizeof *req, GFP_KERNEL); | |
225 | if (!req) | |
226 | return -ENOMEM; | |
227 | ||
228 | spi_message_init(&req->msg); | |
229 | ||
230 | req->command = (u16) (AD7877_WRITEADD(AD7877_REG_CTRL1) | | |
231 | AD7877_READADD(reg)); | |
232 | req->xfer[0].tx_buf = &req->command; | |
233 | req->xfer[0].len = 2; | |
e92c27fb | 234 | req->xfer[0].cs_change = 1; |
331b78ed MH |
235 | |
236 | req->xfer[1].rx_buf = &req->sample; | |
237 | req->xfer[1].len = 2; | |
238 | ||
239 | spi_message_add_tail(&req->xfer[0], &req->msg); | |
240 | spi_message_add_tail(&req->xfer[1], &req->msg); | |
241 | ||
242 | status = spi_sync(spi, &req->msg); | |
243 | ret = status ? : req->sample; | |
244 | ||
245 | kfree(req); | |
246 | ||
247 | return ret; | |
248 | } | |
249 | ||
250 | static int ad7877_write(struct spi_device *spi, u16 reg, u16 val) | |
251 | { | |
252 | struct ser_req *req; | |
253 | int status; | |
254 | ||
255 | req = kzalloc(sizeof *req, GFP_KERNEL); | |
256 | if (!req) | |
257 | return -ENOMEM; | |
258 | ||
259 | spi_message_init(&req->msg); | |
260 | ||
261 | req->command = (u16) (AD7877_WRITEADD(reg) | (val & MAX_12BIT)); | |
262 | req->xfer[0].tx_buf = &req->command; | |
263 | req->xfer[0].len = 2; | |
264 | ||
265 | spi_message_add_tail(&req->xfer[0], &req->msg); | |
266 | ||
267 | status = spi_sync(spi, &req->msg); | |
268 | ||
269 | kfree(req); | |
270 | ||
271 | return status; | |
272 | } | |
273 | ||
274 | static int ad7877_read_adc(struct spi_device *spi, unsigned command) | |
275 | { | |
276 | struct ad7877 *ts = dev_get_drvdata(&spi->dev); | |
277 | struct ser_req *req; | |
278 | int status; | |
279 | int sample; | |
280 | int i; | |
281 | ||
282 | req = kzalloc(sizeof *req, GFP_KERNEL); | |
283 | if (!req) | |
284 | return -ENOMEM; | |
285 | ||
286 | spi_message_init(&req->msg); | |
287 | ||
288 | /* activate reference, so it has time to settle; */ | |
289 | req->ref_on = AD7877_WRITEADD(AD7877_REG_CTRL2) | | |
290 | AD7877_POL(ts->stopacq_polarity) | | |
291 | AD7877_AVG(0) | AD7877_PM(2) | AD7877_TMR(0) | | |
292 | AD7877_ACQ(ts->acquisition_time) | AD7877_FCD(0); | |
293 | ||
294 | req->reset = AD7877_WRITEADD(AD7877_REG_CTRL1) | AD7877_MODE_NOC; | |
295 | ||
296 | req->command = (u16) command; | |
297 | ||
298 | req->xfer[0].tx_buf = &req->reset; | |
299 | req->xfer[0].len = 2; | |
e92c27fb | 300 | req->xfer[0].cs_change = 1; |
331b78ed MH |
301 | |
302 | req->xfer[1].tx_buf = &req->ref_on; | |
303 | req->xfer[1].len = 2; | |
304 | req->xfer[1].delay_usecs = ts->vref_delay_usecs; | |
e92c27fb | 305 | req->xfer[1].cs_change = 1; |
331b78ed MH |
306 | |
307 | req->xfer[2].tx_buf = &req->command; | |
308 | req->xfer[2].len = 2; | |
309 | req->xfer[2].delay_usecs = ts->vref_delay_usecs; | |
e92c27fb | 310 | req->xfer[2].cs_change = 1; |
331b78ed MH |
311 | |
312 | req->xfer[3].rx_buf = &req->sample; | |
313 | req->xfer[3].len = 2; | |
e92c27fb | 314 | req->xfer[3].cs_change = 1; |
331b78ed MH |
315 | |
316 | req->xfer[4].tx_buf = &ts->cmd_crtl2; /*REF OFF*/ | |
317 | req->xfer[4].len = 2; | |
e92c27fb | 318 | req->xfer[4].cs_change = 1; |
331b78ed MH |
319 | |
320 | req->xfer[5].tx_buf = &ts->cmd_crtl1; /*DEFAULT*/ | |
321 | req->xfer[5].len = 2; | |
322 | ||
323 | /* group all the transfers together, so we can't interfere with | |
324 | * reading touchscreen state; disable penirq while sampling | |
325 | */ | |
326 | for (i = 0; i < 6; i++) | |
327 | spi_message_add_tail(&req->xfer[i], &req->msg); | |
328 | ||
329 | status = spi_sync(spi, &req->msg); | |
330 | sample = req->sample; | |
331 | ||
332 | kfree(req); | |
333 | ||
334 | return status ? : sample; | |
335 | } | |
336 | ||
b534422b | 337 | static int ad7877_process_data(struct ad7877 *ts) |
331b78ed MH |
338 | { |
339 | struct input_dev *input_dev = ts->input; | |
340 | unsigned Rt; | |
341 | u16 x, y, z1, z2; | |
342 | ||
343 | x = ts->conversion_data[AD7877_SEQ_XPOS] & MAX_12BIT; | |
344 | y = ts->conversion_data[AD7877_SEQ_YPOS] & MAX_12BIT; | |
345 | z1 = ts->conversion_data[AD7877_SEQ_Z1] & MAX_12BIT; | |
346 | z2 = ts->conversion_data[AD7877_SEQ_Z2] & MAX_12BIT; | |
347 | ||
348 | /* | |
349 | * The samples processed here are already preprocessed by the AD7877. | |
350 | * The preprocessing function consists of an averaging filter. | |
351 | * The combination of 'first conversion delay' and averaging provides a robust solution, | |
352 | * discarding the spurious noise in the signal and keeping only the data of interest. | |
353 | * The size of the averaging filter is programmable. (dev.platform_data, see linux/spi/ad7877.h) | |
354 | * Other user-programmable conversion controls include variable acquisition time, | |
355 | * and first conversion delay. Up to 16 averages can be taken per conversion. | |
356 | */ | |
357 | ||
358 | if (likely(x && z1)) { | |
359 | /* compute touch pressure resistance using equation #1 */ | |
360 | Rt = (z2 - z1) * x * ts->x_plate_ohms; | |
361 | Rt /= z1; | |
362 | Rt = (Rt + 2047) >> 12; | |
363 | ||
1d02ad43 MH |
364 | /* |
365 | * Sample found inconsistent, pressure is beyond | |
366 | * the maximum. Don't report it to user space. | |
367 | */ | |
368 | if (Rt > ts->pressure_max) | |
369 | return -EINVAL; | |
370 | ||
47026b25 MH |
371 | if (!timer_pending(&ts->timer)) |
372 | input_report_key(input_dev, BTN_TOUCH, 1); | |
373 | ||
331b78ed MH |
374 | input_report_abs(input_dev, ABS_X, x); |
375 | input_report_abs(input_dev, ABS_Y, y); | |
376 | input_report_abs(input_dev, ABS_PRESSURE, Rt); | |
377 | input_sync(input_dev); | |
b534422b | 378 | |
47026b25 | 379 | return 0; |
331b78ed | 380 | } |
47026b25 MH |
381 | |
382 | return -EINVAL; | |
331b78ed MH |
383 | } |
384 | ||
385 | static inline void ad7877_ts_event_release(struct ad7877 *ts) | |
386 | { | |
387 | struct input_dev *input_dev = ts->input; | |
388 | ||
389 | input_report_abs(input_dev, ABS_PRESSURE, 0); | |
47026b25 | 390 | input_report_key(input_dev, BTN_TOUCH, 0); |
331b78ed MH |
391 | input_sync(input_dev); |
392 | } | |
393 | ||
394 | static void ad7877_timer(unsigned long handle) | |
395 | { | |
396 | struct ad7877 *ts = (void *)handle; | |
b534422b | 397 | unsigned long flags; |
331b78ed | 398 | |
b534422b | 399 | spin_lock_irqsave(&ts->lock, flags); |
331b78ed | 400 | ad7877_ts_event_release(ts); |
b534422b | 401 | spin_unlock_irqrestore(&ts->lock, flags); |
331b78ed MH |
402 | } |
403 | ||
404 | static irqreturn_t ad7877_irq(int irq, void *handle) | |
405 | { | |
406 | struct ad7877 *ts = handle; | |
407 | unsigned long flags; | |
b534422b | 408 | int error; |
331b78ed | 409 | |
b534422b DT |
410 | error = spi_sync(ts->spi, &ts->msg); |
411 | if (error) { | |
412 | dev_err(&ts->spi->dev, "spi_sync --> %d\n", error); | |
413 | goto out; | |
414 | } | |
331b78ed MH |
415 | |
416 | spin_lock_irqsave(&ts->lock, flags); | |
b534422b DT |
417 | error = ad7877_process_data(ts); |
418 | if (!error) | |
419 | mod_timer(&ts->timer, jiffies + TS_PEN_UP_TIMEOUT); | |
331b78ed MH |
420 | spin_unlock_irqrestore(&ts->lock, flags); |
421 | ||
b534422b | 422 | out: |
331b78ed MH |
423 | return IRQ_HANDLED; |
424 | } | |
425 | ||
331b78ed MH |
426 | static void ad7877_disable(struct ad7877 *ts) |
427 | { | |
428 | mutex_lock(&ts->mutex); | |
429 | ||
430 | if (!ts->disabled) { | |
b534422b | 431 | ts->disabled = true; |
331b78ed MH |
432 | disable_irq(ts->spi->irq); |
433 | ||
331b78ed MH |
434 | if (del_timer_sync(&ts->timer)) |
435 | ad7877_ts_event_release(ts); | |
436 | } | |
437 | ||
b534422b DT |
438 | /* |
439 | * We know the chip's in lowpower mode since we always | |
331b78ed MH |
440 | * leave it that way after every request |
441 | */ | |
442 | ||
443 | mutex_unlock(&ts->mutex); | |
444 | } | |
445 | ||
446 | static void ad7877_enable(struct ad7877 *ts) | |
447 | { | |
448 | mutex_lock(&ts->mutex); | |
449 | ||
450 | if (ts->disabled) { | |
b534422b | 451 | ts->disabled = false; |
331b78ed MH |
452 | enable_irq(ts->spi->irq); |
453 | } | |
454 | ||
455 | mutex_unlock(&ts->mutex); | |
456 | } | |
457 | ||
458 | #define SHOW(name) static ssize_t \ | |
459 | name ## _show(struct device *dev, struct device_attribute *attr, char *buf) \ | |
460 | { \ | |
2fd18aba | 461 | struct ad7877 *ts = dev_get_drvdata(dev); \ |
331b78ed MH |
462 | ssize_t v = ad7877_read_adc(ts->spi, \ |
463 | AD7877_READ_CHAN(name)); \ | |
464 | if (v < 0) \ | |
465 | return v; \ | |
466 | return sprintf(buf, "%u\n", (unsigned) v); \ | |
467 | } \ | |
468 | static DEVICE_ATTR(name, S_IRUGO, name ## _show, NULL); | |
469 | ||
470 | SHOW(aux1) | |
471 | SHOW(aux2) | |
472 | SHOW(aux3) | |
473 | SHOW(bat1) | |
474 | SHOW(bat2) | |
475 | SHOW(temp1) | |
476 | SHOW(temp2) | |
477 | ||
478 | static ssize_t ad7877_disable_show(struct device *dev, | |
479 | struct device_attribute *attr, char *buf) | |
480 | { | |
2fd18aba | 481 | struct ad7877 *ts = dev_get_drvdata(dev); |
331b78ed MH |
482 | |
483 | return sprintf(buf, "%u\n", ts->disabled); | |
484 | } | |
485 | ||
486 | static ssize_t ad7877_disable_store(struct device *dev, | |
487 | struct device_attribute *attr, | |
488 | const char *buf, size_t count) | |
489 | { | |
490 | struct ad7877 *ts = dev_get_drvdata(dev); | |
76496e7a | 491 | unsigned int val; |
331b78ed MH |
492 | int error; |
493 | ||
76496e7a | 494 | error = kstrtouint(buf, 10, &val); |
331b78ed MH |
495 | if (error) |
496 | return error; | |
497 | ||
498 | if (val) | |
499 | ad7877_disable(ts); | |
500 | else | |
501 | ad7877_enable(ts); | |
502 | ||
503 | return count; | |
504 | } | |
505 | ||
506 | static DEVICE_ATTR(disable, 0664, ad7877_disable_show, ad7877_disable_store); | |
507 | ||
508 | static ssize_t ad7877_dac_show(struct device *dev, | |
509 | struct device_attribute *attr, char *buf) | |
510 | { | |
2fd18aba | 511 | struct ad7877 *ts = dev_get_drvdata(dev); |
331b78ed MH |
512 | |
513 | return sprintf(buf, "%u\n", ts->dac); | |
514 | } | |
515 | ||
516 | static ssize_t ad7877_dac_store(struct device *dev, | |
517 | struct device_attribute *attr, | |
518 | const char *buf, size_t count) | |
519 | { | |
520 | struct ad7877 *ts = dev_get_drvdata(dev); | |
76496e7a | 521 | unsigned int val; |
331b78ed MH |
522 | int error; |
523 | ||
76496e7a | 524 | error = kstrtouint(buf, 10, &val); |
331b78ed MH |
525 | if (error) |
526 | return error; | |
527 | ||
528 | mutex_lock(&ts->mutex); | |
529 | ts->dac = val & 0xFF; | |
530 | ad7877_write(ts->spi, AD7877_REG_DAC, (ts->dac << 4) | AD7877_DAC_CONF); | |
531 | mutex_unlock(&ts->mutex); | |
532 | ||
533 | return count; | |
534 | } | |
535 | ||
536 | static DEVICE_ATTR(dac, 0664, ad7877_dac_show, ad7877_dac_store); | |
537 | ||
538 | static ssize_t ad7877_gpio3_show(struct device *dev, | |
539 | struct device_attribute *attr, char *buf) | |
540 | { | |
2fd18aba | 541 | struct ad7877 *ts = dev_get_drvdata(dev); |
331b78ed MH |
542 | |
543 | return sprintf(buf, "%u\n", ts->gpio3); | |
544 | } | |
545 | ||
546 | static ssize_t ad7877_gpio3_store(struct device *dev, | |
547 | struct device_attribute *attr, | |
548 | const char *buf, size_t count) | |
549 | { | |
550 | struct ad7877 *ts = dev_get_drvdata(dev); | |
76496e7a | 551 | unsigned int val; |
331b78ed MH |
552 | int error; |
553 | ||
76496e7a | 554 | error = kstrtouint(buf, 10, &val); |
331b78ed MH |
555 | if (error) |
556 | return error; | |
557 | ||
558 | mutex_lock(&ts->mutex); | |
559 | ts->gpio3 = !!val; | |
560 | ad7877_write(ts->spi, AD7877_REG_EXTWRITE, AD7877_EXTW_GPIO_DATA | | |
561 | (ts->gpio4 << 4) | (ts->gpio3 << 5)); | |
562 | mutex_unlock(&ts->mutex); | |
563 | ||
564 | return count; | |
565 | } | |
566 | ||
567 | static DEVICE_ATTR(gpio3, 0664, ad7877_gpio3_show, ad7877_gpio3_store); | |
568 | ||
569 | static ssize_t ad7877_gpio4_show(struct device *dev, | |
570 | struct device_attribute *attr, char *buf) | |
571 | { | |
2fd18aba | 572 | struct ad7877 *ts = dev_get_drvdata(dev); |
331b78ed MH |
573 | |
574 | return sprintf(buf, "%u\n", ts->gpio4); | |
575 | } | |
576 | ||
577 | static ssize_t ad7877_gpio4_store(struct device *dev, | |
578 | struct device_attribute *attr, | |
579 | const char *buf, size_t count) | |
580 | { | |
581 | struct ad7877 *ts = dev_get_drvdata(dev); | |
76496e7a | 582 | unsigned int val; |
331b78ed MH |
583 | int error; |
584 | ||
76496e7a | 585 | error = kstrtouint(buf, 10, &val); |
331b78ed MH |
586 | if (error) |
587 | return error; | |
588 | ||
589 | mutex_lock(&ts->mutex); | |
590 | ts->gpio4 = !!val; | |
591 | ad7877_write(ts->spi, AD7877_REG_EXTWRITE, AD7877_EXTW_GPIO_DATA | | |
592 | (ts->gpio4 << 4) | (ts->gpio3 << 5)); | |
593 | mutex_unlock(&ts->mutex); | |
594 | ||
595 | return count; | |
596 | } | |
597 | ||
598 | static DEVICE_ATTR(gpio4, 0664, ad7877_gpio4_show, ad7877_gpio4_store); | |
599 | ||
600 | static struct attribute *ad7877_attributes[] = { | |
601 | &dev_attr_temp1.attr, | |
602 | &dev_attr_temp2.attr, | |
603 | &dev_attr_aux1.attr, | |
604 | &dev_attr_aux2.attr, | |
2fd18aba | 605 | &dev_attr_aux3.attr, |
331b78ed MH |
606 | &dev_attr_bat1.attr, |
607 | &dev_attr_bat2.attr, | |
608 | &dev_attr_disable.attr, | |
609 | &dev_attr_dac.attr, | |
2fd18aba | 610 | &dev_attr_gpio3.attr, |
331b78ed MH |
611 | &dev_attr_gpio4.attr, |
612 | NULL | |
613 | }; | |
614 | ||
587a1f16 | 615 | static umode_t ad7877_attr_is_visible(struct kobject *kobj, |
2fd18aba DT |
616 | struct attribute *attr, int n) |
617 | { | |
587a1f16 | 618 | umode_t mode = attr->mode; |
2fd18aba DT |
619 | |
620 | if (attr == &dev_attr_aux3.attr) { | |
621 | if (gpio3) | |
622 | mode = 0; | |
623 | } else if (attr == &dev_attr_gpio3.attr) { | |
624 | if (!gpio3) | |
625 | mode = 0; | |
626 | } | |
627 | ||
628 | return mode; | |
629 | } | |
630 | ||
331b78ed | 631 | static const struct attribute_group ad7877_attr_group = { |
2fd18aba DT |
632 | .is_visible = ad7877_attr_is_visible, |
633 | .attrs = ad7877_attributes, | |
331b78ed MH |
634 | }; |
635 | ||
636 | static void ad7877_setup_ts_def_msg(struct spi_device *spi, struct ad7877 *ts) | |
637 | { | |
638 | struct spi_message *m; | |
639 | int i; | |
640 | ||
641 | ts->cmd_crtl2 = AD7877_WRITEADD(AD7877_REG_CTRL2) | | |
642 | AD7877_POL(ts->stopacq_polarity) | | |
643 | AD7877_AVG(ts->averaging) | AD7877_PM(1) | | |
644 | AD7877_TMR(ts->pen_down_acc_interval) | | |
645 | AD7877_ACQ(ts->acquisition_time) | | |
646 | AD7877_FCD(ts->first_conversion_delay); | |
647 | ||
648 | ad7877_write(spi, AD7877_REG_CTRL2, ts->cmd_crtl2); | |
649 | ||
650 | ts->cmd_crtl1 = AD7877_WRITEADD(AD7877_REG_CTRL1) | | |
651 | AD7877_READADD(AD7877_REG_XPLUS-1) | | |
652 | AD7877_MODE_SEQ1 | AD7877_DFR; | |
653 | ||
654 | ad7877_write(spi, AD7877_REG_CTRL1, ts->cmd_crtl1); | |
655 | ||
656 | ts->cmd_dummy = 0; | |
657 | ||
658 | m = &ts->msg; | |
659 | ||
660 | spi_message_init(m); | |
661 | ||
331b78ed MH |
662 | m->context = ts; |
663 | ||
664 | ts->xfer[0].tx_buf = &ts->cmd_crtl1; | |
665 | ts->xfer[0].len = 2; | |
e92c27fb | 666 | ts->xfer[0].cs_change = 1; |
331b78ed MH |
667 | |
668 | spi_message_add_tail(&ts->xfer[0], m); | |
669 | ||
670 | ts->xfer[1].tx_buf = &ts->cmd_dummy; /* Send ZERO */ | |
671 | ts->xfer[1].len = 2; | |
e92c27fb | 672 | ts->xfer[1].cs_change = 1; |
331b78ed MH |
673 | |
674 | spi_message_add_tail(&ts->xfer[1], m); | |
675 | ||
e92c27fb | 676 | for (i = 0; i < AD7877_NR_SENSE; i++) { |
331b78ed MH |
677 | ts->xfer[i + 2].rx_buf = &ts->conversion_data[AD7877_SEQ_YPOS + i]; |
678 | ts->xfer[i + 2].len = 2; | |
e92c27fb MH |
679 | if (i < (AD7877_NR_SENSE - 1)) |
680 | ts->xfer[i + 2].cs_change = 1; | |
331b78ed MH |
681 | spi_message_add_tail(&ts->xfer[i + 2], m); |
682 | } | |
683 | } | |
684 | ||
5298cc4c | 685 | static int ad7877_probe(struct spi_device *spi) |
331b78ed MH |
686 | { |
687 | struct ad7877 *ts; | |
688 | struct input_dev *input_dev; | |
689 | struct ad7877_platform_data *pdata = spi->dev.platform_data; | |
690 | int err; | |
691 | u16 verify; | |
692 | ||
693 | if (!spi->irq) { | |
694 | dev_dbg(&spi->dev, "no IRQ?\n"); | |
695 | return -ENODEV; | |
696 | } | |
697 | ||
698 | if (!pdata) { | |
699 | dev_dbg(&spi->dev, "no platform data?\n"); | |
700 | return -ENODEV; | |
701 | } | |
702 | ||
703 | /* don't exceed max specified SPI CLK frequency */ | |
704 | if (spi->max_speed_hz > MAX_SPI_FREQ_HZ) { | |
705 | dev_dbg(&spi->dev, "SPI CLK %d Hz?\n",spi->max_speed_hz); | |
706 | return -EINVAL; | |
707 | } | |
708 | ||
cd9b6fdf OS |
709 | spi->bits_per_word = 16; |
710 | err = spi_setup(spi); | |
711 | if (err) { | |
712 | dev_dbg(&spi->dev, "spi master doesn't support 16 bits/word\n"); | |
713 | return err; | |
714 | } | |
715 | ||
331b78ed MH |
716 | ts = kzalloc(sizeof(struct ad7877), GFP_KERNEL); |
717 | input_dev = input_allocate_device(); | |
718 | if (!ts || !input_dev) { | |
719 | err = -ENOMEM; | |
720 | goto err_free_mem; | |
721 | } | |
722 | ||
723 | dev_set_drvdata(&spi->dev, ts); | |
724 | ts->spi = spi; | |
725 | ts->input = input_dev; | |
726 | ||
727 | setup_timer(&ts->timer, ad7877_timer, (unsigned long) ts); | |
728 | mutex_init(&ts->mutex); | |
729 | spin_lock_init(&ts->lock); | |
730 | ||
731 | ts->model = pdata->model ? : 7877; | |
732 | ts->vref_delay_usecs = pdata->vref_delay_usecs ? : 100; | |
733 | ts->x_plate_ohms = pdata->x_plate_ohms ? : 400; | |
734 | ts->pressure_max = pdata->pressure_max ? : ~0; | |
735 | ||
736 | ts->stopacq_polarity = pdata->stopacq_polarity; | |
737 | ts->first_conversion_delay = pdata->first_conversion_delay; | |
738 | ts->acquisition_time = pdata->acquisition_time; | |
739 | ts->averaging = pdata->averaging; | |
740 | ts->pen_down_acc_interval = pdata->pen_down_acc_interval; | |
741 | ||
742 | snprintf(ts->phys, sizeof(ts->phys), "%s/input0", dev_name(&spi->dev)); | |
743 | ||
744 | input_dev->name = "AD7877 Touchscreen"; | |
745 | input_dev->phys = ts->phys; | |
746 | input_dev->dev.parent = &spi->dev; | |
747 | ||
47026b25 MH |
748 | __set_bit(EV_KEY, input_dev->evbit); |
749 | __set_bit(BTN_TOUCH, input_dev->keybit); | |
331b78ed MH |
750 | __set_bit(EV_ABS, input_dev->evbit); |
751 | __set_bit(ABS_X, input_dev->absbit); | |
752 | __set_bit(ABS_Y, input_dev->absbit); | |
753 | __set_bit(ABS_PRESSURE, input_dev->absbit); | |
754 | ||
755 | input_set_abs_params(input_dev, ABS_X, | |
756 | pdata->x_min ? : 0, | |
757 | pdata->x_max ? : MAX_12BIT, | |
758 | 0, 0); | |
759 | input_set_abs_params(input_dev, ABS_Y, | |
760 | pdata->y_min ? : 0, | |
761 | pdata->y_max ? : MAX_12BIT, | |
762 | 0, 0); | |
763 | input_set_abs_params(input_dev, ABS_PRESSURE, | |
764 | pdata->pressure_min, pdata->pressure_max, 0, 0); | |
765 | ||
766 | ad7877_write(spi, AD7877_REG_SEQ1, AD7877_MM_SEQUENCE); | |
767 | ||
768 | verify = ad7877_read(spi, AD7877_REG_SEQ1); | |
769 | ||
770 | if (verify != AD7877_MM_SEQUENCE){ | |
771 | dev_err(&spi->dev, "%s: Failed to probe %s\n", | |
772 | dev_name(&spi->dev), input_dev->name); | |
773 | err = -ENODEV; | |
774 | goto err_free_mem; | |
775 | } | |
776 | ||
777 | if (gpio3) | |
778 | ad7877_write(spi, AD7877_REG_EXTWRITE, AD7877_EXTW_GPIO_3_CONF); | |
779 | ||
780 | ad7877_setup_ts_def_msg(spi, ts); | |
781 | ||
782 | /* Request AD7877 /DAV GPIO interrupt */ | |
783 | ||
b534422b DT |
784 | err = request_threaded_irq(spi->irq, NULL, ad7877_irq, |
785 | IRQF_TRIGGER_FALLING | IRQF_ONESHOT, | |
786 | spi->dev.driver->name, ts); | |
331b78ed MH |
787 | if (err) { |
788 | dev_dbg(&spi->dev, "irq %d busy?\n", spi->irq); | |
789 | goto err_free_mem; | |
790 | } | |
791 | ||
792 | err = sysfs_create_group(&spi->dev.kobj, &ad7877_attr_group); | |
793 | if (err) | |
794 | goto err_free_irq; | |
795 | ||
331b78ed MH |
796 | err = input_register_device(input_dev); |
797 | if (err) | |
2fd18aba | 798 | goto err_remove_attr_group; |
331b78ed MH |
799 | |
800 | return 0; | |
801 | ||
331b78ed MH |
802 | err_remove_attr_group: |
803 | sysfs_remove_group(&spi->dev.kobj, &ad7877_attr_group); | |
804 | err_free_irq: | |
805 | free_irq(spi->irq, ts); | |
806 | err_free_mem: | |
807 | input_free_device(input_dev); | |
808 | kfree(ts); | |
809 | dev_set_drvdata(&spi->dev, NULL); | |
810 | return err; | |
811 | } | |
812 | ||
813 | static int __devexit ad7877_remove(struct spi_device *spi) | |
814 | { | |
2fd18aba | 815 | struct ad7877 *ts = dev_get_drvdata(&spi->dev); |
331b78ed MH |
816 | |
817 | sysfs_remove_group(&spi->dev.kobj, &ad7877_attr_group); | |
331b78ed MH |
818 | |
819 | ad7877_disable(ts); | |
820 | free_irq(ts->spi->irq, ts); | |
821 | ||
822 | input_unregister_device(ts->input); | |
823 | kfree(ts); | |
824 | ||
825 | dev_dbg(&spi->dev, "unregistered touchscreen\n"); | |
826 | dev_set_drvdata(&spi->dev, NULL); | |
827 | ||
828 | return 0; | |
829 | } | |
830 | ||
fccdd7c4 MB |
831 | #ifdef CONFIG_PM_SLEEP |
832 | static int ad7877_suspend(struct device *dev) | |
331b78ed | 833 | { |
fccdd7c4 | 834 | struct ad7877 *ts = dev_get_drvdata(dev); |
331b78ed MH |
835 | |
836 | ad7877_disable(ts); | |
837 | ||
838 | return 0; | |
839 | } | |
840 | ||
fccdd7c4 | 841 | static int ad7877_resume(struct device *dev) |
331b78ed | 842 | { |
fccdd7c4 | 843 | struct ad7877 *ts = dev_get_drvdata(dev); |
331b78ed MH |
844 | |
845 | ad7877_enable(ts); | |
846 | ||
847 | return 0; | |
848 | } | |
331b78ed MH |
849 | #endif |
850 | ||
fccdd7c4 MB |
851 | static SIMPLE_DEV_PM_OPS(ad7877_pm, ad7877_suspend, ad7877_resume); |
852 | ||
331b78ed MH |
853 | static struct spi_driver ad7877_driver = { |
854 | .driver = { | |
855 | .name = "ad7877", | |
331b78ed | 856 | .owner = THIS_MODULE, |
fccdd7c4 | 857 | .pm = &ad7877_pm, |
331b78ed MH |
858 | }, |
859 | .probe = ad7877_probe, | |
1cb0aa88 | 860 | .remove = ad7877_remove, |
331b78ed MH |
861 | }; |
862 | ||
ca83922e | 863 | module_spi_driver(ad7877_driver); |
331b78ed MH |
864 | |
865 | MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>"); | |
866 | MODULE_DESCRIPTION("AD7877 touchscreen Driver"); | |
867 | MODULE_LICENSE("GPL"); | |
e0626e38 | 868 | MODULE_ALIAS("spi:ad7877"); |