Commit | Line | Data |
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ffa458c1 DB |
1 | /* |
2 | * ADS7846 based touchscreen and sensor driver | |
3 | * | |
4 | * Copyright (c) 2005 David Brownell | |
7de90a8c ID |
5 | * Copyright (c) 2006 Nokia Corporation |
6 | * Various changes: Imre Deak <imre.deak@nokia.com> | |
ffa458c1 DB |
7 | * |
8 | * Using code from: | |
9 | * - corgi_ts.c | |
10 | * Copyright (C) 2004-2005 Richard Purdie | |
11 | * - omap_ts.[hc], ads7846.h, ts_osk.c | |
12 | * Copyright (C) 2002 MontaVista Software | |
13 | * Copyright (C) 2004 Texas Instruments | |
14 | * Copyright (C) 2005 Dirk Behme | |
15 | * | |
16 | * This program is free software; you can redistribute it and/or modify | |
17 | * it under the terms of the GNU General Public License version 2 as | |
18 | * published by the Free Software Foundation. | |
19 | */ | |
20 | #include <linux/device.h> | |
21 | #include <linux/init.h> | |
22 | #include <linux/delay.h> | |
23 | #include <linux/input.h> | |
24 | #include <linux/interrupt.h> | |
25 | #include <linux/slab.h> | |
26 | #include <linux/spi/spi.h> | |
27 | #include <linux/spi/ads7846.h> | |
3ac8bf07 | 28 | #include <asm/irq.h> |
ffa458c1 DB |
29 | |
30 | #ifdef CONFIG_ARM | |
31 | #include <asm/mach-types.h> | |
32 | #ifdef CONFIG_ARCH_OMAP | |
33 | #include <asm/arch/gpio.h> | |
34 | #endif | |
ffa458c1 DB |
35 | #endif |
36 | ||
37 | ||
38 | /* | |
9084533e DB |
39 | * This code has been heavily tested on a Nokia 770, and lightly |
40 | * tested on other ads7846 devices (OSK/Mistral, Lubbock). | |
ffa458c1 DB |
41 | * Support for ads7843 and ads7845 has only been stubbed in. |
42 | * | |
7de90a8c ID |
43 | * IRQ handling needs a workaround because of a shortcoming in handling |
44 | * edge triggered IRQs on some platforms like the OMAP1/2. These | |
45 | * platforms don't handle the ARM lazy IRQ disabling properly, thus we | |
46 | * have to maintain our own SW IRQ disabled status. This should be | |
47 | * removed as soon as the affected platform's IRQ handling is fixed. | |
48 | * | |
ffa458c1 DB |
49 | * app note sbaa036 talks in more detail about accurate sampling... |
50 | * that ought to help in situations like LCDs inducing noise (which | |
51 | * can also be helped by using synch signals) and more generally. | |
7de90a8c ID |
52 | * This driver tries to utilize the measures described in the app |
53 | * note. The strength of filtering can be set in the board-* specific | |
54 | * files. | |
ffa458c1 DB |
55 | */ |
56 | ||
1936d590 ID |
57 | #define TS_POLL_DELAY (1 * 1000000) /* ns delay before the first sample */ |
58 | #define TS_POLL_PERIOD (5 * 1000000) /* ns delay between samples */ | |
ffa458c1 | 59 | |
d93f70b2 DB |
60 | /* this driver doesn't aim at the peak continuous sample rate */ |
61 | #define SAMPLE_BITS (8 /*cmd*/ + 16 /*sample*/ + 2 /* before, after */) | |
62 | ||
ffa458c1 DB |
63 | struct ts_event { |
64 | /* For portability, we can't read 12 bit values using SPI (which | |
65 | * would make the controller deliver them as native byteorder u16 | |
d93f70b2 | 66 | * with msbs zeroed). Instead, we read them as two 8-bit values, |
da970e69 | 67 | * *** WHICH NEED BYTESWAPPING *** and range adjustment. |
ffa458c1 | 68 | */ |
da970e69 ID |
69 | u16 x; |
70 | u16 y; | |
71 | u16 z1, z2; | |
d5b415c9 | 72 | int ignore; |
ffa458c1 DB |
73 | }; |
74 | ||
75 | struct ads7846 { | |
a90f7e98 | 76 | struct input_dev *input; |
ffa458c1 DB |
77 | char phys[32]; |
78 | ||
79 | struct spi_device *spi; | |
8dd51650 | 80 | struct attribute_group *attr_group; |
ffa458c1 DB |
81 | u16 model; |
82 | u16 vref_delay_usecs; | |
83 | u16 x_plate_ohms; | |
d5b415c9 | 84 | u16 pressure_max; |
ffa458c1 | 85 | |
53a0ef89 ID |
86 | u8 read_x, read_y, read_z1, read_z2, pwrdown; |
87 | u16 dummy; /* for the pwrdown read */ | |
ffa458c1 DB |
88 | struct ts_event tc; |
89 | ||
53a0ef89 | 90 | struct spi_transfer xfer[10]; |
0b7018aa | 91 | struct spi_message msg[5]; |
d5b415c9 | 92 | struct spi_message *last_msg; |
0b7018aa ID |
93 | int msg_idx; |
94 | int read_cnt; | |
d5b415c9 | 95 | int read_rep; |
0b7018aa ID |
96 | int last_read; |
97 | ||
98 | u16 debounce_max; | |
99 | u16 debounce_tol; | |
d5b415c9 | 100 | u16 debounce_rep; |
ffa458c1 DB |
101 | |
102 | spinlock_t lock; | |
1936d590 | 103 | struct hrtimer timer; |
ffa458c1 DB |
104 | unsigned pendown:1; /* P: lock */ |
105 | unsigned pending:1; /* P: lock */ | |
106 | // FIXME remove "irq_disabled" | |
107 | unsigned irq_disabled:1; /* P: lock */ | |
7de90a8c | 108 | unsigned disabled:1; |
c9e617a5 | 109 | |
da970e69 ID |
110 | int (*filter)(void *data, int data_idx, int *val); |
111 | void *filter_data; | |
112 | void (*filter_cleanup)(void *data); | |
c9e617a5 | 113 | int (*get_pendown_state)(void); |
ffa458c1 DB |
114 | }; |
115 | ||
116 | /* leave chip selected when we're done, for quicker re-select? */ | |
117 | #if 0 | |
118 | #define CS_CHANGE(xfer) ((xfer).cs_change = 1) | |
119 | #else | |
120 | #define CS_CHANGE(xfer) ((xfer).cs_change = 0) | |
121 | #endif | |
122 | ||
123 | /*--------------------------------------------------------------------------*/ | |
124 | ||
125 | /* The ADS7846 has touchscreen and other sensors. | |
126 | * Earlier ads784x chips are somewhat compatible. | |
127 | */ | |
128 | #define ADS_START (1 << 7) | |
129 | #define ADS_A2A1A0_d_y (1 << 4) /* differential */ | |
130 | #define ADS_A2A1A0_d_z1 (3 << 4) /* differential */ | |
131 | #define ADS_A2A1A0_d_z2 (4 << 4) /* differential */ | |
132 | #define ADS_A2A1A0_d_x (5 << 4) /* differential */ | |
133 | #define ADS_A2A1A0_temp0 (0 << 4) /* non-differential */ | |
134 | #define ADS_A2A1A0_vbatt (2 << 4) /* non-differential */ | |
135 | #define ADS_A2A1A0_vaux (6 << 4) /* non-differential */ | |
136 | #define ADS_A2A1A0_temp1 (7 << 4) /* non-differential */ | |
137 | #define ADS_8_BIT (1 << 3) | |
138 | #define ADS_12_BIT (0 << 3) | |
139 | #define ADS_SER (1 << 2) /* non-differential */ | |
140 | #define ADS_DFR (0 << 2) /* differential */ | |
141 | #define ADS_PD10_PDOWN (0 << 0) /* lowpower mode + penirq */ | |
142 | #define ADS_PD10_ADC_ON (1 << 0) /* ADC on */ | |
143 | #define ADS_PD10_REF_ON (2 << 0) /* vREF on + penirq */ | |
144 | #define ADS_PD10_ALL_ON (3 << 0) /* ADC + vREF on */ | |
145 | ||
146 | #define MAX_12BIT ((1<<12)-1) | |
147 | ||
148 | /* leave ADC powered up (disables penirq) between differential samples */ | |
de2defd9 ID |
149 | #define READ_12BIT_DFR(x, adc, vref) (ADS_START | ADS_A2A1A0_d_ ## x \ |
150 | | ADS_12_BIT | ADS_DFR | \ | |
151 | (adc ? ADS_PD10_ADC_ON : 0) | (vref ? ADS_PD10_REF_ON : 0)) | |
ffa458c1 | 152 | |
de2defd9 ID |
153 | #define READ_Y(vref) (READ_12BIT_DFR(y, 1, vref)) |
154 | #define READ_Z1(vref) (READ_12BIT_DFR(z1, 1, vref)) | |
155 | #define READ_Z2(vref) (READ_12BIT_DFR(z2, 1, vref)) | |
53a0ef89 | 156 | |
de2defd9 ID |
157 | #define READ_X(vref) (READ_12BIT_DFR(x, 1, vref)) |
158 | #define PWRDOWN (READ_12BIT_DFR(y, 0, 0)) /* LAST */ | |
ffa458c1 DB |
159 | |
160 | /* single-ended samples need to first power up reference voltage; | |
161 | * we leave both ADC and VREF powered | |
162 | */ | |
163 | #define READ_12BIT_SER(x) (ADS_START | ADS_A2A1A0_ ## x \ | |
164 | | ADS_12_BIT | ADS_SER) | |
165 | ||
de2defd9 ID |
166 | #define REF_ON (READ_12BIT_DFR(x, 1, 1)) |
167 | #define REF_OFF (READ_12BIT_DFR(y, 0, 0)) | |
ffa458c1 DB |
168 | |
169 | /*--------------------------------------------------------------------------*/ | |
170 | ||
171 | /* | |
172 | * Non-touchscreen sensors only use single-ended conversions. | |
173 | */ | |
174 | ||
175 | struct ser_req { | |
d93f70b2 | 176 | u8 ref_on; |
ffa458c1 | 177 | u8 command; |
d93f70b2 | 178 | u8 ref_off; |
ffa458c1 DB |
179 | u16 scratch; |
180 | __be16 sample; | |
181 | struct spi_message msg; | |
182 | struct spi_transfer xfer[6]; | |
183 | }; | |
184 | ||
7de90a8c ID |
185 | static void ads7846_enable(struct ads7846 *ts); |
186 | static void ads7846_disable(struct ads7846 *ts); | |
187 | ||
c9e617a5 ID |
188 | static int device_suspended(struct device *dev) |
189 | { | |
190 | struct ads7846 *ts = dev_get_drvdata(dev); | |
191 | return dev->power.power_state.event != PM_EVENT_ON || ts->disabled; | |
192 | } | |
193 | ||
ffa458c1 DB |
194 | static int ads7846_read12_ser(struct device *dev, unsigned command) |
195 | { | |
196 | struct spi_device *spi = to_spi_device(dev); | |
197 | struct ads7846 *ts = dev_get_drvdata(dev); | |
e94b1766 | 198 | struct ser_req *req = kzalloc(sizeof *req, GFP_KERNEL); |
ffa458c1 DB |
199 | int status; |
200 | int sample; | |
a90f7e98 | 201 | int i; |
ffa458c1 DB |
202 | |
203 | if (!req) | |
204 | return -ENOMEM; | |
205 | ||
0b7018aa | 206 | spi_message_init(&req->msg); |
8275c642 | 207 | |
ffa458c1 | 208 | /* activate reference, so it has time to settle; */ |
d93f70b2 DB |
209 | req->ref_on = REF_ON; |
210 | req->xfer[0].tx_buf = &req->ref_on; | |
ffa458c1 DB |
211 | req->xfer[0].len = 1; |
212 | req->xfer[1].rx_buf = &req->scratch; | |
213 | req->xfer[1].len = 2; | |
214 | ||
215 | /* | |
216 | * for external VREF, 0 usec (and assume it's always on); | |
217 | * for 1uF, use 800 usec; | |
218 | * no cap, 100 usec. | |
219 | */ | |
220 | req->xfer[1].delay_usecs = ts->vref_delay_usecs; | |
221 | ||
222 | /* take sample */ | |
223 | req->command = (u8) command; | |
224 | req->xfer[2].tx_buf = &req->command; | |
225 | req->xfer[2].len = 1; | |
226 | req->xfer[3].rx_buf = &req->sample; | |
227 | req->xfer[3].len = 2; | |
228 | ||
229 | /* REVISIT: take a few more samples, and compare ... */ | |
230 | ||
231 | /* turn off reference */ | |
d93f70b2 DB |
232 | req->ref_off = REF_OFF; |
233 | req->xfer[4].tx_buf = &req->ref_off; | |
ffa458c1 DB |
234 | req->xfer[4].len = 1; |
235 | req->xfer[5].rx_buf = &req->scratch; | |
236 | req->xfer[5].len = 2; | |
237 | ||
238 | CS_CHANGE(req->xfer[5]); | |
239 | ||
240 | /* group all the transfers together, so we can't interfere with | |
241 | * reading touchscreen state; disable penirq while sampling | |
242 | */ | |
8275c642 VW |
243 | for (i = 0; i < 6; i++) |
244 | spi_message_add_tail(&req->xfer[i], &req->msg); | |
ffa458c1 | 245 | |
c9e617a5 | 246 | ts->irq_disabled = 1; |
ffa458c1 DB |
247 | disable_irq(spi->irq); |
248 | status = spi_sync(spi, &req->msg); | |
c9e617a5 | 249 | ts->irq_disabled = 0; |
ffa458c1 DB |
250 | enable_irq(spi->irq); |
251 | ||
252 | if (req->msg.status) | |
253 | status = req->msg.status; | |
9084533e DB |
254 | |
255 | /* on-wire is a must-ignore bit, a BE12 value, then padding */ | |
ffa458c1 | 256 | sample = be16_to_cpu(req->sample); |
9084533e DB |
257 | sample = sample >> 3; |
258 | sample &= 0x0fff; | |
ffa458c1 | 259 | |
9084533e | 260 | kfree(req); |
ffa458c1 DB |
261 | return status ? status : sample; |
262 | } | |
263 | ||
264 | #define SHOW(name) static ssize_t \ | |
265 | name ## _show(struct device *dev, struct device_attribute *attr, char *buf) \ | |
266 | { \ | |
267 | ssize_t v = ads7846_read12_ser(dev, \ | |
268 | READ_12BIT_SER(name) | ADS_PD10_ALL_ON); \ | |
269 | if (v < 0) \ | |
270 | return v; \ | |
271 | return sprintf(buf, "%u\n", (unsigned) v); \ | |
272 | } \ | |
273 | static DEVICE_ATTR(name, S_IRUGO, name ## _show, NULL); | |
274 | ||
275 | SHOW(temp0) | |
276 | SHOW(temp1) | |
277 | SHOW(vaux) | |
278 | SHOW(vbatt) | |
279 | ||
438f2a74 ID |
280 | static int is_pen_down(struct device *dev) |
281 | { | |
282 | struct ads7846 *ts = dev_get_drvdata(dev); | |
283 | ||
284 | return ts->pendown; | |
285 | } | |
286 | ||
287 | static ssize_t ads7846_pen_down_show(struct device *dev, | |
288 | struct device_attribute *attr, char *buf) | |
289 | { | |
290 | return sprintf(buf, "%u\n", is_pen_down(dev)); | |
291 | } | |
292 | ||
293 | static DEVICE_ATTR(pen_down, S_IRUGO, ads7846_pen_down_show, NULL); | |
294 | ||
7de90a8c ID |
295 | static ssize_t ads7846_disable_show(struct device *dev, |
296 | struct device_attribute *attr, char *buf) | |
297 | { | |
298 | struct ads7846 *ts = dev_get_drvdata(dev); | |
299 | ||
300 | return sprintf(buf, "%u\n", ts->disabled); | |
301 | } | |
302 | ||
303 | static ssize_t ads7846_disable_store(struct device *dev, | |
304 | struct device_attribute *attr, | |
305 | const char *buf, size_t count) | |
306 | { | |
307 | struct ads7846 *ts = dev_get_drvdata(dev); | |
308 | char *endp; | |
309 | int i; | |
310 | ||
311 | i = simple_strtoul(buf, &endp, 10); | |
312 | spin_lock_irq(&ts->lock); | |
313 | ||
314 | if (i) | |
315 | ads7846_disable(ts); | |
316 | else | |
317 | ads7846_enable(ts); | |
318 | ||
319 | spin_unlock_irq(&ts->lock); | |
320 | ||
321 | return count; | |
322 | } | |
323 | ||
324 | static DEVICE_ATTR(disable, 0664, ads7846_disable_show, ads7846_disable_store); | |
325 | ||
8dd51650 DT |
326 | static struct attribute *ads7846_attributes[] = { |
327 | &dev_attr_temp0.attr, | |
328 | &dev_attr_temp1.attr, | |
329 | &dev_attr_vbatt.attr, | |
330 | &dev_attr_vaux.attr, | |
331 | &dev_attr_pen_down.attr, | |
332 | &dev_attr_disable.attr, | |
333 | NULL, | |
334 | }; | |
335 | ||
336 | static struct attribute_group ads7846_attr_group = { | |
337 | .attrs = ads7846_attributes, | |
338 | }; | |
339 | ||
340 | /* | |
341 | * ads7843/7845 don't have temperature sensors, and | |
342 | * use the other sensors a bit differently too | |
343 | */ | |
344 | ||
345 | static struct attribute *ads7843_attributes[] = { | |
346 | &dev_attr_vbatt.attr, | |
347 | &dev_attr_vaux.attr, | |
348 | &dev_attr_pen_down.attr, | |
349 | &dev_attr_disable.attr, | |
350 | NULL, | |
351 | }; | |
352 | ||
353 | static struct attribute_group ads7843_attr_group = { | |
354 | .attrs = ads7843_attributes, | |
355 | }; | |
356 | ||
357 | static struct attribute *ads7845_attributes[] = { | |
358 | &dev_attr_vaux.attr, | |
359 | &dev_attr_pen_down.attr, | |
360 | &dev_attr_disable.attr, | |
361 | NULL, | |
362 | }; | |
363 | ||
364 | static struct attribute_group ads7845_attr_group = { | |
365 | .attrs = ads7845_attributes, | |
366 | }; | |
367 | ||
ffa458c1 DB |
368 | /*--------------------------------------------------------------------------*/ |
369 | ||
370 | /* | |
371 | * PENIRQ only kicks the timer. The timer only reissues the SPI transfer, | |
372 | * to retrieve touchscreen status. | |
373 | * | |
374 | * The SPI transfer completion callback does the real work. It reports | |
375 | * touchscreen events and reactivates the timer (or IRQ) as appropriate. | |
376 | */ | |
377 | ||
378 | static void ads7846_rx(void *ads) | |
379 | { | |
a90f7e98 DT |
380 | struct ads7846 *ts = ads; |
381 | struct input_dev *input_dev = ts->input; | |
382 | unsigned Rt; | |
383 | unsigned sync = 0; | |
384 | u16 x, y, z1, z2; | |
385 | unsigned long flags; | |
ffa458c1 | 386 | |
da970e69 ID |
387 | /* ads7846_rx_val() did in-place conversion (including byteswap) from |
388 | * on-the-wire format as part of debouncing to get stable readings. | |
ffa458c1 | 389 | */ |
da970e69 ID |
390 | x = ts->tc.x; |
391 | y = ts->tc.y; | |
392 | z1 = ts->tc.z1; | |
393 | z2 = ts->tc.z2; | |
ffa458c1 DB |
394 | |
395 | /* range filtering */ | |
396 | if (x == MAX_12BIT) | |
397 | x = 0; | |
398 | ||
c9e617a5 | 399 | if (likely(x && z1 && !device_suspended(&ts->spi->dev))) { |
ffa458c1 DB |
400 | /* compute touch pressure resistance using equation #2 */ |
401 | Rt = z2; | |
402 | Rt -= z1; | |
403 | Rt *= x; | |
404 | Rt *= ts->x_plate_ohms; | |
405 | Rt /= z1; | |
406 | Rt = (Rt + 2047) >> 12; | |
407 | } else | |
408 | Rt = 0; | |
409 | ||
d5b415c9 | 410 | /* Sample found inconsistent by debouncing or pressure is beyond |
1936d590 ID |
411 | * the maximum. Don't report it to user space, repeat at least |
412 | * once more the measurement | |
413 | */ | |
d5b415c9 | 414 | if (ts->tc.ignore || Rt > ts->pressure_max) { |
1936d590 ID |
415 | hrtimer_start(&ts->timer, ktime_set(0, TS_POLL_PERIOD), |
416 | HRTIMER_REL); | |
d5b415c9 ID |
417 | return; |
418 | } | |
419 | ||
ffa458c1 DB |
420 | /* NOTE: "pendown" is inferred from pressure; we don't rely on |
421 | * being able to check nPENIRQ status, or "friendly" trigger modes | |
422 | * (both-edges is much better than just-falling or low-level). | |
423 | * | |
424 | * REVISIT: some boards may require reading nPENIRQ; it's | |
425 | * needed on 7843. and 7845 reads pressure differently... | |
426 | * | |
427 | * REVISIT: the touchscreen might not be connected; this code | |
428 | * won't notice that, even if nPENIRQ never fires ... | |
429 | */ | |
430 | if (!ts->pendown && Rt != 0) { | |
a90f7e98 | 431 | input_report_key(input_dev, BTN_TOUCH, 1); |
ffa458c1 DB |
432 | sync = 1; |
433 | } else if (ts->pendown && Rt == 0) { | |
a90f7e98 | 434 | input_report_key(input_dev, BTN_TOUCH, 0); |
ffa458c1 DB |
435 | sync = 1; |
436 | } | |
437 | ||
438 | if (Rt) { | |
a90f7e98 DT |
439 | input_report_abs(input_dev, ABS_X, x); |
440 | input_report_abs(input_dev, ABS_Y, y); | |
ffa458c1 DB |
441 | sync = 1; |
442 | } | |
ae82d5ab ID |
443 | |
444 | if (sync) { | |
445 | input_report_abs(input_dev, ABS_PRESSURE, Rt); | |
a90f7e98 | 446 | input_sync(input_dev); |
ae82d5ab | 447 | } |
ffa458c1 DB |
448 | |
449 | #ifdef VERBOSE | |
450 | if (Rt || ts->pendown) | |
451 | pr_debug("%s: %d/%d/%d%s\n", ts->spi->dev.bus_id, | |
452 | x, y, Rt, Rt ? "" : " UP"); | |
453 | #endif | |
454 | ||
ffa458c1 DB |
455 | spin_lock_irqsave(&ts->lock, flags); |
456 | ||
457 | ts->pendown = (Rt != 0); | |
1936d590 | 458 | hrtimer_start(&ts->timer, ktime_set(0, TS_POLL_PERIOD), HRTIMER_REL); |
ffa458c1 DB |
459 | |
460 | spin_unlock_irqrestore(&ts->lock, flags); | |
461 | } | |
462 | ||
da970e69 | 463 | static int ads7846_debounce(void *ads, int data_idx, int *val) |
0b7018aa ID |
464 | { |
465 | struct ads7846 *ts = ads; | |
0b7018aa | 466 | |
da970e69 ID |
467 | if (!ts->read_cnt || (abs(ts->last_read - *val) > ts->debounce_tol)) { |
468 | /* Start over collecting consistent readings. */ | |
469 | ts->read_rep = 0; | |
d5b415c9 ID |
470 | /* Repeat it, if this was the first read or the read |
471 | * wasn't consistent enough. */ | |
472 | if (ts->read_cnt < ts->debounce_max) { | |
da970e69 | 473 | ts->last_read = *val; |
d5b415c9 | 474 | ts->read_cnt++; |
da970e69 | 475 | return ADS7846_FILTER_REPEAT; |
d5b415c9 ID |
476 | } else { |
477 | /* Maximum number of debouncing reached and still | |
478 | * not enough number of consistent readings. Abort | |
479 | * the whole sample, repeat it in the next sampling | |
480 | * period. | |
481 | */ | |
d5b415c9 | 482 | ts->read_cnt = 0; |
da970e69 | 483 | return ADS7846_FILTER_IGNORE; |
d5b415c9 | 484 | } |
0b7018aa | 485 | } else { |
d5b415c9 ID |
486 | if (++ts->read_rep > ts->debounce_rep) { |
487 | /* Got a good reading for this coordinate, | |
488 | * go for the next one. */ | |
d5b415c9 ID |
489 | ts->read_cnt = 0; |
490 | ts->read_rep = 0; | |
da970e69 ID |
491 | return ADS7846_FILTER_OK; |
492 | } else { | |
d5b415c9 ID |
493 | /* Read more values that are consistent. */ |
494 | ts->read_cnt++; | |
da970e69 ID |
495 | return ADS7846_FILTER_REPEAT; |
496 | } | |
497 | } | |
498 | } | |
499 | ||
500 | static int ads7846_no_filter(void *ads, int data_idx, int *val) | |
501 | { | |
502 | return ADS7846_FILTER_OK; | |
503 | } | |
504 | ||
505 | static void ads7846_rx_val(void *ads) | |
506 | { | |
507 | struct ads7846 *ts = ads; | |
508 | struct spi_message *m; | |
509 | struct spi_transfer *t; | |
510 | u16 *rx_val; | |
511 | int val; | |
512 | int action; | |
513 | int status; | |
514 | ||
515 | m = &ts->msg[ts->msg_idx]; | |
516 | t = list_entry(m->transfers.prev, struct spi_transfer, transfer_list); | |
517 | rx_val = t->rx_buf; | |
518 | ||
519 | /* adjust: on-wire is a must-ignore bit, a BE12 value, then padding; | |
520 | * built from two 8 bit values written msb-first. | |
521 | */ | |
522 | val = be16_to_cpu(*rx_val) >> 3; | |
523 | ||
524 | action = ts->filter(ts->filter_data, ts->msg_idx, &val); | |
525 | switch (action) { | |
526 | case ADS7846_FILTER_REPEAT: | |
527 | break; | |
528 | case ADS7846_FILTER_IGNORE: | |
529 | ts->tc.ignore = 1; | |
530 | /* Last message will contain ads7846_rx() as the | |
531 | * completion function. | |
532 | */ | |
533 | m = ts->last_msg; | |
534 | break; | |
535 | case ADS7846_FILTER_OK: | |
536 | *rx_val = val; | |
537 | ts->tc.ignore = 0; | |
538 | m = &ts->msg[++ts->msg_idx]; | |
539 | break; | |
540 | default: | |
541 | BUG(); | |
0b7018aa ID |
542 | } |
543 | status = spi_async(ts->spi, m); | |
544 | if (status) | |
545 | dev_err(&ts->spi->dev, "spi_async --> %d\n", | |
546 | status); | |
547 | } | |
548 | ||
1936d590 | 549 | static int ads7846_timer(struct hrtimer *handle) |
ffa458c1 | 550 | { |
1936d590 | 551 | struct ads7846 *ts = container_of(handle, struct ads7846, timer); |
ffa458c1 | 552 | int status = 0; |
0b7018aa | 553 | |
c9e617a5 ID |
554 | spin_lock_irq(&ts->lock); |
555 | ||
556 | if (unlikely(ts->msg_idx && !ts->pendown)) { | |
9084533e | 557 | /* measurement cycle ended */ |
c9e617a5 ID |
558 | if (!device_suspended(&ts->spi->dev)) { |
559 | ts->irq_disabled = 0; | |
560 | enable_irq(ts->spi->irq); | |
561 | } | |
562 | ts->pending = 0; | |
563 | ts->msg_idx = 0; | |
564 | } else { | |
565 | /* pen is still down, continue with the measurement */ | |
566 | ts->msg_idx = 0; | |
567 | status = spi_async(ts->spi, &ts->msg[0]); | |
568 | if (status) | |
569 | dev_err(&ts->spi->dev, "spi_async --> %d\n", status); | |
570 | } | |
571 | ||
572 | spin_unlock_irq(&ts->lock); | |
1936d590 | 573 | return HRTIMER_NORESTART; |
0b7018aa ID |
574 | } |
575 | ||
7d12e780 | 576 | static irqreturn_t ads7846_irq(int irq, void *handle) |
0b7018aa ID |
577 | { |
578 | struct ads7846 *ts = handle; | |
579 | unsigned long flags; | |
ffa458c1 DB |
580 | |
581 | spin_lock_irqsave(&ts->lock, flags); | |
c9e617a5 | 582 | if (likely(ts->get_pendown_state())) { |
ffa458c1 | 583 | if (!ts->irq_disabled) { |
9084533e DB |
584 | /* The ARM do_simple_IRQ() dispatcher doesn't act |
585 | * like the other dispatchers: it will report IRQs | |
586 | * even after they've been disabled. We work around | |
587 | * that here. (The "generic irq" framework may help...) | |
0b7018aa | 588 | */ |
ffa458c1 DB |
589 | ts->irq_disabled = 1; |
590 | disable_irq(ts->spi->irq); | |
0b7018aa | 591 | ts->pending = 1; |
1936d590 ID |
592 | hrtimer_start(&ts->timer, ktime_set(0, TS_POLL_DELAY), |
593 | HRTIMER_REL); | |
0b7018aa | 594 | } |
ffa458c1 DB |
595 | } |
596 | spin_unlock_irqrestore(&ts->lock, flags); | |
7de90a8c ID |
597 | |
598 | return IRQ_HANDLED; | |
ffa458c1 DB |
599 | } |
600 | ||
601 | /*--------------------------------------------------------------------------*/ | |
602 | ||
7de90a8c ID |
603 | /* Must be called with ts->lock held */ |
604 | static void ads7846_disable(struct ads7846 *ts) | |
ffa458c1 | 605 | { |
7de90a8c ID |
606 | if (ts->disabled) |
607 | return; | |
ffa458c1 | 608 | |
c9e617a5 ID |
609 | ts->disabled = 1; |
610 | ||
ffa458c1 | 611 | /* are we waiting for IRQ, or polling? */ |
c9e617a5 ID |
612 | if (!ts->pending) { |
613 | ts->irq_disabled = 1; | |
614 | disable_irq(ts->spi->irq); | |
ffa458c1 | 615 | } else { |
c9e617a5 ID |
616 | /* the timer will run at least once more, and |
617 | * leave everything in a clean state, IRQ disabled | |
ffa458c1 | 618 | */ |
c9e617a5 | 619 | while (ts->pending) { |
7de90a8c | 620 | spin_unlock_irq(&ts->lock); |
c4febb94 | 621 | msleep(1); |
7de90a8c | 622 | spin_lock_irq(&ts->lock); |
ffa458c1 DB |
623 | } |
624 | } | |
625 | ||
626 | /* we know the chip's in lowpower mode since we always | |
627 | * leave it that way after every request | |
628 | */ | |
629 | ||
7de90a8c ID |
630 | } |
631 | ||
632 | /* Must be called with ts->lock held */ | |
633 | static void ads7846_enable(struct ads7846 *ts) | |
634 | { | |
635 | if (!ts->disabled) | |
636 | return; | |
637 | ||
638 | ts->disabled = 0; | |
639 | ts->irq_disabled = 0; | |
640 | enable_irq(ts->spi->irq); | |
641 | } | |
642 | ||
643 | static int ads7846_suspend(struct spi_device *spi, pm_message_t message) | |
644 | { | |
645 | struct ads7846 *ts = dev_get_drvdata(&spi->dev); | |
646 | ||
647 | spin_lock_irq(&ts->lock); | |
648 | ||
649 | spi->dev.power.power_state = message; | |
650 | ads7846_disable(ts); | |
651 | ||
652 | spin_unlock_irq(&ts->lock); | |
653 | ||
ffa458c1 | 654 | return 0; |
7de90a8c | 655 | |
ffa458c1 DB |
656 | } |
657 | ||
2e5a7bd9 | 658 | static int ads7846_resume(struct spi_device *spi) |
ffa458c1 | 659 | { |
2e5a7bd9 | 660 | struct ads7846 *ts = dev_get_drvdata(&spi->dev); |
ffa458c1 | 661 | |
7de90a8c ID |
662 | spin_lock_irq(&ts->lock); |
663 | ||
2e5a7bd9 | 664 | spi->dev.power.power_state = PMSG_ON; |
7de90a8c ID |
665 | ads7846_enable(ts); |
666 | ||
667 | spin_unlock_irq(&ts->lock); | |
668 | ||
ffa458c1 DB |
669 | return 0; |
670 | } | |
671 | ||
2e5a7bd9 | 672 | static int __devinit ads7846_probe(struct spi_device *spi) |
ffa458c1 | 673 | { |
ffa458c1 | 674 | struct ads7846 *ts; |
a90f7e98 | 675 | struct input_dev *input_dev; |
2e5a7bd9 | 676 | struct ads7846_platform_data *pdata = spi->dev.platform_data; |
0b7018aa | 677 | struct spi_message *m; |
ffa458c1 | 678 | struct spi_transfer *x; |
de2defd9 | 679 | int vref; |
a90f7e98 | 680 | int err; |
ffa458c1 DB |
681 | |
682 | if (!spi->irq) { | |
2e5a7bd9 | 683 | dev_dbg(&spi->dev, "no IRQ?\n"); |
ffa458c1 DB |
684 | return -ENODEV; |
685 | } | |
686 | ||
687 | if (!pdata) { | |
2e5a7bd9 | 688 | dev_dbg(&spi->dev, "no platform data?\n"); |
ffa458c1 DB |
689 | return -ENODEV; |
690 | } | |
691 | ||
692 | /* don't exceed max specified sample rate */ | |
d93f70b2 | 693 | if (spi->max_speed_hz > (125000 * SAMPLE_BITS)) { |
2e5a7bd9 | 694 | dev_dbg(&spi->dev, "f(sample) %d KHz?\n", |
d93f70b2 | 695 | (spi->max_speed_hz/SAMPLE_BITS)/1000); |
ffa458c1 DB |
696 | return -EINVAL; |
697 | } | |
698 | ||
9084533e DB |
699 | /* REVISIT when the irq can be triggered active-low, or if for some |
700 | * reason the touchscreen isn't hooked up, we don't need to access | |
701 | * the pendown state. | |
702 | */ | |
c9e617a5 ID |
703 | if (pdata->get_pendown_state == NULL) { |
704 | dev_dbg(&spi->dev, "no get_pendown_state function?\n"); | |
705 | return -EINVAL; | |
706 | } | |
707 | ||
9084533e DB |
708 | /* We'd set TX wordsize 8 bits and RX wordsize to 13 bits ... except |
709 | * that even if the hardware can do that, the SPI controller driver | |
710 | * may not. So we stick to very-portable 8 bit words, both RX and TX. | |
ffa458c1 | 711 | */ |
9084533e | 712 | spi->bits_per_word = 8; |
7937e86a ID |
713 | spi->mode = SPI_MODE_1; |
714 | err = spi_setup(spi); | |
715 | if (err < 0) | |
716 | return err; | |
ffa458c1 | 717 | |
a90f7e98 DT |
718 | ts = kzalloc(sizeof(struct ads7846), GFP_KERNEL); |
719 | input_dev = input_allocate_device(); | |
720 | if (!ts || !input_dev) { | |
721 | err = -ENOMEM; | |
722 | goto err_free_mem; | |
723 | } | |
ffa458c1 | 724 | |
2e5a7bd9 | 725 | dev_set_drvdata(&spi->dev, ts); |
a90f7e98 | 726 | spi->dev.power.power_state = PMSG_ON; |
ffa458c1 DB |
727 | |
728 | ts->spi = spi; | |
a90f7e98 | 729 | ts->input = input_dev; |
ffa458c1 | 730 | |
1936d590 | 731 | hrtimer_init(&ts->timer, CLOCK_MONOTONIC, HRTIMER_REL); |
ffa458c1 DB |
732 | ts->timer.function = ads7846_timer; |
733 | ||
7de90a8c ID |
734 | spin_lock_init(&ts->lock); |
735 | ||
ffa458c1 DB |
736 | ts->model = pdata->model ? : 7846; |
737 | ts->vref_delay_usecs = pdata->vref_delay_usecs ? : 100; | |
738 | ts->x_plate_ohms = pdata->x_plate_ohms ? : 400; | |
d5b415c9 | 739 | ts->pressure_max = pdata->pressure_max ? : ~0; |
da970e69 ID |
740 | |
741 | if (pdata->filter != NULL) { | |
742 | if (pdata->filter_init != NULL) { | |
743 | err = pdata->filter_init(pdata, &ts->filter_data); | |
744 | if (err < 0) | |
745 | goto err_free_mem; | |
746 | } | |
747 | ts->filter = pdata->filter; | |
748 | ts->filter_cleanup = pdata->filter_cleanup; | |
749 | } else if (pdata->debounce_max) { | |
d5b415c9 | 750 | ts->debounce_max = pdata->debounce_max; |
da970e69 ID |
751 | if (ts->debounce_max < 2) |
752 | ts->debounce_max = 2; | |
d5b415c9 ID |
753 | ts->debounce_tol = pdata->debounce_tol; |
754 | ts->debounce_rep = pdata->debounce_rep; | |
da970e69 ID |
755 | ts->filter = ads7846_debounce; |
756 | ts->filter_data = ts; | |
d5b415c9 | 757 | } else |
da970e69 | 758 | ts->filter = ads7846_no_filter; |
c9e617a5 | 759 | ts->get_pendown_state = pdata->get_pendown_state; |
ffa458c1 | 760 | |
a90f7e98 | 761 | snprintf(ts->phys, sizeof(ts->phys), "%s/input0", spi->dev.bus_id); |
ffa458c1 | 762 | |
a90f7e98 DT |
763 | input_dev->name = "ADS784x Touchscreen"; |
764 | input_dev->phys = ts->phys; | |
765 | input_dev->cdev.dev = &spi->dev; | |
ffa458c1 | 766 | |
a90f7e98 DT |
767 | input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_ABS); |
768 | input_dev->keybit[LONG(BTN_TOUCH)] = BIT(BTN_TOUCH); | |
769 | input_set_abs_params(input_dev, ABS_X, | |
ffa458c1 DB |
770 | pdata->x_min ? : 0, |
771 | pdata->x_max ? : MAX_12BIT, | |
772 | 0, 0); | |
a90f7e98 | 773 | input_set_abs_params(input_dev, ABS_Y, |
ffa458c1 DB |
774 | pdata->y_min ? : 0, |
775 | pdata->y_max ? : MAX_12BIT, | |
776 | 0, 0); | |
a90f7e98 | 777 | input_set_abs_params(input_dev, ABS_PRESSURE, |
ffa458c1 DB |
778 | pdata->pressure_min, pdata->pressure_max, 0, 0); |
779 | ||
de2defd9 ID |
780 | vref = pdata->keep_vref_on; |
781 | ||
ffa458c1 DB |
782 | /* set up the transfers to read touchscreen state; this assumes we |
783 | * use formula #2 for pressure, not #3. | |
784 | */ | |
0b7018aa | 785 | m = &ts->msg[0]; |
ffa458c1 DB |
786 | x = ts->xfer; |
787 | ||
0b7018aa ID |
788 | spi_message_init(m); |
789 | ||
ffa458c1 | 790 | /* y- still on; turn on only y+ (and ADC) */ |
de2defd9 | 791 | ts->read_y = READ_Y(vref); |
d93f70b2 | 792 | x->tx_buf = &ts->read_y; |
ffa458c1 | 793 | x->len = 1; |
0b7018aa | 794 | spi_message_add_tail(x, m); |
d93f70b2 | 795 | |
ffa458c1 DB |
796 | x++; |
797 | x->rx_buf = &ts->tc.y; | |
798 | x->len = 2; | |
0b7018aa ID |
799 | spi_message_add_tail(x, m); |
800 | ||
da970e69 | 801 | m->complete = ads7846_rx_val; |
0b7018aa ID |
802 | m->context = ts; |
803 | ||
804 | m++; | |
805 | spi_message_init(m); | |
806 | ||
807 | /* turn y- off, x+ on, then leave in lowpower */ | |
808 | x++; | |
de2defd9 | 809 | ts->read_x = READ_X(vref); |
0b7018aa ID |
810 | x->tx_buf = &ts->read_x; |
811 | x->len = 1; | |
812 | spi_message_add_tail(x, m); | |
813 | ||
814 | x++; | |
815 | x->rx_buf = &ts->tc.x; | |
816 | x->len = 2; | |
817 | spi_message_add_tail(x, m); | |
818 | ||
da970e69 | 819 | m->complete = ads7846_rx_val; |
0b7018aa | 820 | m->context = ts; |
ffa458c1 DB |
821 | |
822 | /* turn y+ off, x- on; we'll use formula #2 */ | |
823 | if (ts->model == 7846) { | |
0b7018aa ID |
824 | m++; |
825 | spi_message_init(m); | |
826 | ||
d93f70b2 | 827 | x++; |
de2defd9 | 828 | ts->read_z1 = READ_Z1(vref); |
d93f70b2 | 829 | x->tx_buf = &ts->read_z1; |
ffa458c1 | 830 | x->len = 1; |
0b7018aa | 831 | spi_message_add_tail(x, m); |
d93f70b2 | 832 | |
ffa458c1 DB |
833 | x++; |
834 | x->rx_buf = &ts->tc.z1; | |
835 | x->len = 2; | |
0b7018aa ID |
836 | spi_message_add_tail(x, m); |
837 | ||
da970e69 | 838 | m->complete = ads7846_rx_val; |
0b7018aa ID |
839 | m->context = ts; |
840 | ||
841 | m++; | |
842 | spi_message_init(m); | |
ffa458c1 | 843 | |
d93f70b2 | 844 | x++; |
de2defd9 | 845 | ts->read_z2 = READ_Z2(vref); |
d93f70b2 | 846 | x->tx_buf = &ts->read_z2; |
ffa458c1 | 847 | x->len = 1; |
0b7018aa | 848 | spi_message_add_tail(x, m); |
d93f70b2 | 849 | |
ffa458c1 DB |
850 | x++; |
851 | x->rx_buf = &ts->tc.z2; | |
852 | x->len = 2; | |
0b7018aa | 853 | spi_message_add_tail(x, m); |
ffa458c1 | 854 | |
da970e69 | 855 | m->complete = ads7846_rx_val; |
0b7018aa ID |
856 | m->context = ts; |
857 | } | |
53a0ef89 ID |
858 | |
859 | /* power down */ | |
0b7018aa ID |
860 | m++; |
861 | spi_message_init(m); | |
862 | ||
53a0ef89 ID |
863 | x++; |
864 | ts->pwrdown = PWRDOWN; | |
865 | x->tx_buf = &ts->pwrdown; | |
866 | x->len = 1; | |
0b7018aa | 867 | spi_message_add_tail(x, m); |
53a0ef89 ID |
868 | |
869 | x++; | |
870 | x->rx_buf = &ts->dummy; | |
871 | x->len = 2; | |
d93f70b2 | 872 | CS_CHANGE(*x); |
0b7018aa | 873 | spi_message_add_tail(x, m); |
ffa458c1 | 874 | |
0b7018aa ID |
875 | m->complete = ads7846_rx; |
876 | m->context = ts; | |
ffa458c1 | 877 | |
d5b415c9 ID |
878 | ts->last_msg = m; |
879 | ||
dace1453 | 880 | if (request_irq(spi->irq, ads7846_irq, IRQF_TRIGGER_FALLING, |
9084533e | 881 | spi->dev.driver->name, ts)) { |
2e5a7bd9 | 882 | dev_dbg(&spi->dev, "irq %d busy?\n", spi->irq); |
a90f7e98 | 883 | err = -EBUSY; |
da970e69 | 884 | goto err_cleanup_filter; |
ffa458c1 | 885 | } |
ffa458c1 | 886 | |
2e5a7bd9 | 887 | dev_info(&spi->dev, "touchscreen, irq %d\n", spi->irq); |
ffa458c1 DB |
888 | |
889 | /* take a first sample, leaving nPENIRQ active; avoid | |
890 | * the touchscreen, in case it's not connected. | |
891 | */ | |
2e5a7bd9 | 892 | (void) ads7846_read12_ser(&spi->dev, |
ffa458c1 DB |
893 | READ_12BIT_SER(vaux) | ADS_PD10_ALL_ON); |
894 | ||
8dd51650 DT |
895 | switch (ts->model) { |
896 | case 7846: | |
897 | ts->attr_group = &ads7846_attr_group; | |
898 | break; | |
899 | case 7845: | |
900 | ts->attr_group = &ads7845_attr_group; | |
901 | break; | |
902 | default: | |
903 | ts->attr_group = &ads7843_attr_group; | |
904 | break; | |
ffa458c1 | 905 | } |
8dd51650 DT |
906 | err = sysfs_create_group(&spi->dev.kobj, ts->attr_group); |
907 | if (err) | |
908 | goto err_free_irq; | |
7de90a8c | 909 | |
a90f7e98 DT |
910 | err = input_register_device(input_dev); |
911 | if (err) | |
8dd51650 | 912 | goto err_remove_attr_group; |
a90f7e98 | 913 | |
ffa458c1 | 914 | return 0; |
a90f7e98 | 915 | |
8dd51650 DT |
916 | err_remove_attr_group: |
917 | sysfs_remove_group(&spi->dev.kobj, ts->attr_group); | |
918 | err_free_irq: | |
a90f7e98 | 919 | free_irq(spi->irq, ts); |
da970e69 ID |
920 | err_cleanup_filter: |
921 | if (ts->filter_cleanup) | |
922 | ts->filter_cleanup(ts->filter_data); | |
a90f7e98 DT |
923 | err_free_mem: |
924 | input_free_device(input_dev); | |
925 | kfree(ts); | |
926 | return err; | |
ffa458c1 DB |
927 | } |
928 | ||
2e5a7bd9 | 929 | static int __devexit ads7846_remove(struct spi_device *spi) |
ffa458c1 | 930 | { |
2e5a7bd9 | 931 | struct ads7846 *ts = dev_get_drvdata(&spi->dev); |
ffa458c1 | 932 | |
7de90a8c ID |
933 | input_unregister_device(ts->input); |
934 | ||
2e5a7bd9 | 935 | ads7846_suspend(spi, PMSG_SUSPEND); |
ffa458c1 | 936 | |
8dd51650 | 937 | sysfs_remove_group(&spi->dev.kobj, ts->attr_group); |
ffa458c1 | 938 | |
7de90a8c | 939 | free_irq(ts->spi->irq, ts); |
c9e617a5 ID |
940 | /* suspend left the IRQ disabled */ |
941 | enable_irq(ts->spi->irq); | |
7de90a8c | 942 | |
da970e69 ID |
943 | if (ts->filter_cleanup) |
944 | ts->filter_cleanup(ts->filter_data); | |
945 | ||
ffa458c1 DB |
946 | kfree(ts); |
947 | ||
2e5a7bd9 | 948 | dev_dbg(&spi->dev, "unregistered touchscreen\n"); |
ffa458c1 DB |
949 | return 0; |
950 | } | |
951 | ||
2e5a7bd9 DB |
952 | static struct spi_driver ads7846_driver = { |
953 | .driver = { | |
954 | .name = "ads7846", | |
955 | .bus = &spi_bus_type, | |
956 | .owner = THIS_MODULE, | |
957 | }, | |
ffa458c1 | 958 | .probe = ads7846_probe, |
2e5a7bd9 | 959 | .remove = __devexit_p(ads7846_remove), |
ffa458c1 DB |
960 | .suspend = ads7846_suspend, |
961 | .resume = ads7846_resume, | |
962 | }; | |
963 | ||
964 | static int __init ads7846_init(void) | |
965 | { | |
966 | /* grr, board-specific init should stay out of drivers!! */ | |
967 | ||
968 | #ifdef CONFIG_ARCH_OMAP | |
969 | if (machine_is_omap_osk()) { | |
970 | /* GPIO4 = PENIRQ; GPIO6 = BUSY */ | |
971 | omap_request_gpio(4); | |
972 | omap_set_gpio_direction(4, 1); | |
973 | omap_request_gpio(6); | |
974 | omap_set_gpio_direction(6, 1); | |
975 | } | |
976 | // also TI 1510 Innovator, bitbanging through FPGA | |
977 | // also Nokia 770 | |
978 | // also Palm Tungsten T2 | |
979 | #endif | |
980 | ||
981 | // PXA: | |
982 | // also Dell Axim X50 | |
983 | // also HP iPaq H191x/H192x/H415x/H435x | |
2e5a7bd9 | 984 | // also Intel Lubbock (additional to UCB1400; as temperature sensor) |
ffa458c1 DB |
985 | // also Sharp Zaurus C7xx, C8xx (corgi/sheperd/husky) |
986 | ||
2e5a7bd9 DB |
987 | // Atmel at91sam9261-EK uses ads7843 |
988 | ||
ffa458c1 DB |
989 | // also various AMD Au1x00 devel boards |
990 | ||
2e5a7bd9 | 991 | return spi_register_driver(&ads7846_driver); |
ffa458c1 DB |
992 | } |
993 | module_init(ads7846_init); | |
994 | ||
995 | static void __exit ads7846_exit(void) | |
996 | { | |
2e5a7bd9 | 997 | spi_unregister_driver(&ads7846_driver); |
ffa458c1 DB |
998 | |
999 | #ifdef CONFIG_ARCH_OMAP | |
1000 | if (machine_is_omap_osk()) { | |
1001 | omap_free_gpio(4); | |
1002 | omap_free_gpio(6); | |
1003 | } | |
1004 | #endif | |
1005 | ||
1006 | } | |
1007 | module_exit(ads7846_exit); | |
1008 | ||
1009 | MODULE_DESCRIPTION("ADS7846 TouchScreen Driver"); | |
1010 | MODULE_LICENSE("GPL"); |