Commit | Line | Data |
---|---|---|
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 | */ | |
2c8dc071 | 20 | #include <linux/hwmon.h> |
ffa458c1 | 21 | #include <linux/init.h> |
2c8dc071 | 22 | #include <linux/err.h> |
ffa458c1 DB |
23 | #include <linux/delay.h> |
24 | #include <linux/input.h> | |
25 | #include <linux/interrupt.h> | |
26 | #include <linux/slab.h> | |
27 | #include <linux/spi/spi.h> | |
28 | #include <linux/spi/ads7846.h> | |
3ac8bf07 | 29 | #include <asm/irq.h> |
ffa458c1 | 30 | |
ffa458c1 DB |
31 | |
32 | /* | |
9084533e DB |
33 | * This code has been heavily tested on a Nokia 770, and lightly |
34 | * tested on other ads7846 devices (OSK/Mistral, Lubbock). | |
bff0de5f | 35 | * TSC2046 is just newer ads7846 silicon. |
969111e9 NF |
36 | * Support for ads7843 tested on Atmel at91sam926x-EK. |
37 | * Support for ads7845 has only been stubbed in. | |
ffa458c1 | 38 | * |
7de90a8c ID |
39 | * IRQ handling needs a workaround because of a shortcoming in handling |
40 | * edge triggered IRQs on some platforms like the OMAP1/2. These | |
41 | * platforms don't handle the ARM lazy IRQ disabling properly, thus we | |
42 | * have to maintain our own SW IRQ disabled status. This should be | |
43 | * removed as soon as the affected platform's IRQ handling is fixed. | |
44 | * | |
ffa458c1 DB |
45 | * app note sbaa036 talks in more detail about accurate sampling... |
46 | * that ought to help in situations like LCDs inducing noise (which | |
47 | * can also be helped by using synch signals) and more generally. | |
7de90a8c ID |
48 | * This driver tries to utilize the measures described in the app |
49 | * note. The strength of filtering can be set in the board-* specific | |
50 | * files. | |
ffa458c1 DB |
51 | */ |
52 | ||
1936d590 ID |
53 | #define TS_POLL_DELAY (1 * 1000000) /* ns delay before the first sample */ |
54 | #define TS_POLL_PERIOD (5 * 1000000) /* ns delay between samples */ | |
ffa458c1 | 55 | |
d93f70b2 DB |
56 | /* this driver doesn't aim at the peak continuous sample rate */ |
57 | #define SAMPLE_BITS (8 /*cmd*/ + 16 /*sample*/ + 2 /* before, after */) | |
58 | ||
ffa458c1 DB |
59 | struct ts_event { |
60 | /* For portability, we can't read 12 bit values using SPI (which | |
61 | * would make the controller deliver them as native byteorder u16 | |
d93f70b2 | 62 | * with msbs zeroed). Instead, we read them as two 8-bit values, |
da970e69 | 63 | * *** WHICH NEED BYTESWAPPING *** and range adjustment. |
ffa458c1 | 64 | */ |
da970e69 ID |
65 | u16 x; |
66 | u16 y; | |
67 | u16 z1, z2; | |
2c8dc071 | 68 | int ignore; |
ffa458c1 DB |
69 | }; |
70 | ||
71 | struct ads7846 { | |
a90f7e98 | 72 | struct input_dev *input; |
ffa458c1 DB |
73 | char phys[32]; |
74 | ||
75 | struct spi_device *spi; | |
2c8dc071 DB |
76 | |
77 | #if defined(CONFIG_HWMON) || defined(CONFIG_HWMON_MODULE) | |
8dd51650 | 78 | struct attribute_group *attr_group; |
1beeffe4 | 79 | struct device *hwmon; |
2c8dc071 DB |
80 | #endif |
81 | ||
ffa458c1 | 82 | u16 model; |
7c6d0ee1 | 83 | u16 vref_mv; |
ffa458c1 DB |
84 | u16 vref_delay_usecs; |
85 | u16 x_plate_ohms; | |
d5b415c9 | 86 | u16 pressure_max; |
ffa458c1 | 87 | |
53a0ef89 ID |
88 | u8 read_x, read_y, read_z1, read_z2, pwrdown; |
89 | u16 dummy; /* for the pwrdown read */ | |
ffa458c1 DB |
90 | struct ts_event tc; |
91 | ||
e4f48861 | 92 | struct spi_transfer xfer[18]; |
0b7018aa | 93 | struct spi_message msg[5]; |
d5b415c9 | 94 | struct spi_message *last_msg; |
0b7018aa ID |
95 | int msg_idx; |
96 | int read_cnt; | |
d5b415c9 | 97 | int read_rep; |
0b7018aa ID |
98 | int last_read; |
99 | ||
100 | u16 debounce_max; | |
101 | u16 debounce_tol; | |
d5b415c9 | 102 | u16 debounce_rep; |
ffa458c1 | 103 | |
1d25891f SH |
104 | u16 penirq_recheck_delay_usecs; |
105 | ||
ffa458c1 | 106 | spinlock_t lock; |
1936d590 | 107 | struct hrtimer timer; |
ffa458c1 DB |
108 | unsigned pendown:1; /* P: lock */ |
109 | unsigned pending:1; /* P: lock */ | |
110 | // FIXME remove "irq_disabled" | |
111 | unsigned irq_disabled:1; /* P: lock */ | |
7de90a8c | 112 | unsigned disabled:1; |
fbb38e30 | 113 | unsigned is_suspended:1; |
c9e617a5 | 114 | |
da970e69 ID |
115 | int (*filter)(void *data, int data_idx, int *val); |
116 | void *filter_data; | |
117 | void (*filter_cleanup)(void *data); | |
c9e617a5 | 118 | int (*get_pendown_state)(void); |
ffa458c1 DB |
119 | }; |
120 | ||
121 | /* leave chip selected when we're done, for quicker re-select? */ | |
122 | #if 0 | |
123 | #define CS_CHANGE(xfer) ((xfer).cs_change = 1) | |
124 | #else | |
125 | #define CS_CHANGE(xfer) ((xfer).cs_change = 0) | |
126 | #endif | |
127 | ||
128 | /*--------------------------------------------------------------------------*/ | |
129 | ||
130 | /* The ADS7846 has touchscreen and other sensors. | |
131 | * Earlier ads784x chips are somewhat compatible. | |
132 | */ | |
133 | #define ADS_START (1 << 7) | |
134 | #define ADS_A2A1A0_d_y (1 << 4) /* differential */ | |
135 | #define ADS_A2A1A0_d_z1 (3 << 4) /* differential */ | |
136 | #define ADS_A2A1A0_d_z2 (4 << 4) /* differential */ | |
137 | #define ADS_A2A1A0_d_x (5 << 4) /* differential */ | |
138 | #define ADS_A2A1A0_temp0 (0 << 4) /* non-differential */ | |
139 | #define ADS_A2A1A0_vbatt (2 << 4) /* non-differential */ | |
140 | #define ADS_A2A1A0_vaux (6 << 4) /* non-differential */ | |
141 | #define ADS_A2A1A0_temp1 (7 << 4) /* non-differential */ | |
142 | #define ADS_8_BIT (1 << 3) | |
143 | #define ADS_12_BIT (0 << 3) | |
144 | #define ADS_SER (1 << 2) /* non-differential */ | |
145 | #define ADS_DFR (0 << 2) /* differential */ | |
146 | #define ADS_PD10_PDOWN (0 << 0) /* lowpower mode + penirq */ | |
147 | #define ADS_PD10_ADC_ON (1 << 0) /* ADC on */ | |
148 | #define ADS_PD10_REF_ON (2 << 0) /* vREF on + penirq */ | |
149 | #define ADS_PD10_ALL_ON (3 << 0) /* ADC + vREF on */ | |
150 | ||
151 | #define MAX_12BIT ((1<<12)-1) | |
152 | ||
153 | /* leave ADC powered up (disables penirq) between differential samples */ | |
de2defd9 ID |
154 | #define READ_12BIT_DFR(x, adc, vref) (ADS_START | ADS_A2A1A0_d_ ## x \ |
155 | | ADS_12_BIT | ADS_DFR | \ | |
156 | (adc ? ADS_PD10_ADC_ON : 0) | (vref ? ADS_PD10_REF_ON : 0)) | |
ffa458c1 | 157 | |
de2defd9 ID |
158 | #define READ_Y(vref) (READ_12BIT_DFR(y, 1, vref)) |
159 | #define READ_Z1(vref) (READ_12BIT_DFR(z1, 1, vref)) | |
160 | #define READ_Z2(vref) (READ_12BIT_DFR(z2, 1, vref)) | |
53a0ef89 | 161 | |
de2defd9 ID |
162 | #define READ_X(vref) (READ_12BIT_DFR(x, 1, vref)) |
163 | #define PWRDOWN (READ_12BIT_DFR(y, 0, 0)) /* LAST */ | |
ffa458c1 DB |
164 | |
165 | /* single-ended samples need to first power up reference voltage; | |
166 | * we leave both ADC and VREF powered | |
167 | */ | |
168 | #define READ_12BIT_SER(x) (ADS_START | ADS_A2A1A0_ ## x \ | |
169 | | ADS_12_BIT | ADS_SER) | |
170 | ||
de2defd9 ID |
171 | #define REF_ON (READ_12BIT_DFR(x, 1, 1)) |
172 | #define REF_OFF (READ_12BIT_DFR(y, 0, 0)) | |
ffa458c1 DB |
173 | |
174 | /*--------------------------------------------------------------------------*/ | |
175 | ||
176 | /* | |
177 | * Non-touchscreen sensors only use single-ended conversions. | |
2c8dc071 DB |
178 | * The range is GND..vREF. The ads7843 and ads7835 must use external vREF; |
179 | * ads7846 lets that pin be unconnected, to use internal vREF. | |
ffa458c1 DB |
180 | */ |
181 | ||
182 | struct ser_req { | |
d93f70b2 | 183 | u8 ref_on; |
ffa458c1 | 184 | u8 command; |
d93f70b2 | 185 | u8 ref_off; |
ffa458c1 DB |
186 | u16 scratch; |
187 | __be16 sample; | |
188 | struct spi_message msg; | |
189 | struct spi_transfer xfer[6]; | |
190 | }; | |
191 | ||
7de90a8c ID |
192 | static void ads7846_enable(struct ads7846 *ts); |
193 | static void ads7846_disable(struct ads7846 *ts); | |
194 | ||
c9e617a5 ID |
195 | static int device_suspended(struct device *dev) |
196 | { | |
197 | struct ads7846 *ts = dev_get_drvdata(dev); | |
fbb38e30 | 198 | return ts->is_suspended || ts->disabled; |
c9e617a5 ID |
199 | } |
200 | ||
ffa458c1 DB |
201 | static int ads7846_read12_ser(struct device *dev, unsigned command) |
202 | { | |
203 | struct spi_device *spi = to_spi_device(dev); | |
204 | struct ads7846 *ts = dev_get_drvdata(dev); | |
e94b1766 | 205 | struct ser_req *req = kzalloc(sizeof *req, GFP_KERNEL); |
ffa458c1 | 206 | int status; |
2c8dc071 | 207 | int use_internal; |
ffa458c1 DB |
208 | |
209 | if (!req) | |
210 | return -ENOMEM; | |
211 | ||
0b7018aa | 212 | spi_message_init(&req->msg); |
8275c642 | 213 | |
2c8dc071 DB |
214 | /* FIXME boards with ads7846 might use external vref instead ... */ |
215 | use_internal = (ts->model == 7846); | |
216 | ||
217 | /* maybe turn on internal vREF, and let it settle */ | |
218 | if (use_internal) { | |
219 | req->ref_on = REF_ON; | |
220 | req->xfer[0].tx_buf = &req->ref_on; | |
221 | req->xfer[0].len = 1; | |
222 | spi_message_add_tail(&req->xfer[0], &req->msg); | |
223 | ||
224 | req->xfer[1].rx_buf = &req->scratch; | |
225 | req->xfer[1].len = 2; | |
226 | ||
227 | /* for 1uF, settle for 800 usec; no cap, 100 usec. */ | |
228 | req->xfer[1].delay_usecs = ts->vref_delay_usecs; | |
229 | spi_message_add_tail(&req->xfer[1], &req->msg); | |
230 | } | |
ffa458c1 DB |
231 | |
232 | /* take sample */ | |
233 | req->command = (u8) command; | |
234 | req->xfer[2].tx_buf = &req->command; | |
235 | req->xfer[2].len = 1; | |
2c8dc071 DB |
236 | spi_message_add_tail(&req->xfer[2], &req->msg); |
237 | ||
ffa458c1 DB |
238 | req->xfer[3].rx_buf = &req->sample; |
239 | req->xfer[3].len = 2; | |
2c8dc071 | 240 | spi_message_add_tail(&req->xfer[3], &req->msg); |
ffa458c1 DB |
241 | |
242 | /* REVISIT: take a few more samples, and compare ... */ | |
243 | ||
969111e9 NF |
244 | /* converter in low power mode & enable PENIRQ */ |
245 | req->ref_off = PWRDOWN; | |
246 | req->xfer[4].tx_buf = &req->ref_off; | |
247 | req->xfer[4].len = 1; | |
248 | spi_message_add_tail(&req->xfer[4], &req->msg); | |
249 | ||
250 | req->xfer[5].rx_buf = &req->scratch; | |
251 | req->xfer[5].len = 2; | |
252 | CS_CHANGE(req->xfer[5]); | |
253 | spi_message_add_tail(&req->xfer[5], &req->msg); | |
ffa458c1 | 254 | |
c9e617a5 | 255 | ts->irq_disabled = 1; |
ffa458c1 DB |
256 | disable_irq(spi->irq); |
257 | status = spi_sync(spi, &req->msg); | |
c9e617a5 | 258 | ts->irq_disabled = 0; |
ffa458c1 DB |
259 | enable_irq(spi->irq); |
260 | ||
c24b2602 MP |
261 | if (status == 0) { |
262 | /* on-wire is a must-ignore bit, a BE12 value, then padding */ | |
7c6d0ee1 DB |
263 | status = be16_to_cpu(req->sample); |
264 | status = status >> 3; | |
265 | status &= 0x0fff; | |
c24b2602 | 266 | } |
ffa458c1 | 267 | |
9084533e | 268 | kfree(req); |
7c6d0ee1 | 269 | return status; |
ffa458c1 DB |
270 | } |
271 | ||
2c8dc071 DB |
272 | #if defined(CONFIG_HWMON) || defined(CONFIG_HWMON_MODULE) |
273 | ||
274 | #define SHOW(name, var, adjust) static ssize_t \ | |
ffa458c1 DB |
275 | name ## _show(struct device *dev, struct device_attribute *attr, char *buf) \ |
276 | { \ | |
2c8dc071 | 277 | struct ads7846 *ts = dev_get_drvdata(dev); \ |
ffa458c1 | 278 | ssize_t v = ads7846_read12_ser(dev, \ |
2c8dc071 | 279 | READ_12BIT_SER(var) | ADS_PD10_ALL_ON); \ |
ffa458c1 DB |
280 | if (v < 0) \ |
281 | return v; \ | |
2c8dc071 | 282 | return sprintf(buf, "%u\n", adjust(ts, v)); \ |
ffa458c1 DB |
283 | } \ |
284 | static DEVICE_ATTR(name, S_IRUGO, name ## _show, NULL); | |
285 | ||
2c8dc071 DB |
286 | |
287 | /* Sysfs conventions report temperatures in millidegrees Celcius. | |
288 | * ADS7846 could use the low-accuracy two-sample scheme, but can't do the high | |
289 | * accuracy scheme without calibration data. For now we won't try either; | |
290 | * userspace sees raw sensor values, and must scale/calibrate appropriately. | |
291 | */ | |
292 | static inline unsigned null_adjust(struct ads7846 *ts, ssize_t v) | |
293 | { | |
294 | return v; | |
295 | } | |
296 | ||
297 | SHOW(temp0, temp0, null_adjust) /* temp1_input */ | |
298 | SHOW(temp1, temp1, null_adjust) /* temp2_input */ | |
299 | ||
300 | ||
301 | /* sysfs conventions report voltages in millivolts. We can convert voltages | |
302 | * if we know vREF. userspace may need to scale vAUX to match the board's | |
303 | * external resistors; we assume that vBATT only uses the internal ones. | |
304 | */ | |
305 | static inline unsigned vaux_adjust(struct ads7846 *ts, ssize_t v) | |
306 | { | |
307 | unsigned retval = v; | |
308 | ||
309 | /* external resistors may scale vAUX into 0..vREF */ | |
7c6d0ee1 | 310 | retval *= ts->vref_mv; |
2c8dc071 DB |
311 | retval = retval >> 12; |
312 | return retval; | |
313 | } | |
314 | ||
315 | static inline unsigned vbatt_adjust(struct ads7846 *ts, ssize_t v) | |
316 | { | |
317 | unsigned retval = vaux_adjust(ts, v); | |
318 | ||
319 | /* ads7846 has a resistor ladder to scale this signal down */ | |
320 | if (ts->model == 7846) | |
321 | retval *= 4; | |
322 | return retval; | |
323 | } | |
324 | ||
325 | SHOW(in0_input, vaux, vaux_adjust) | |
326 | SHOW(in1_input, vbatt, vbatt_adjust) | |
327 | ||
328 | ||
329 | static struct attribute *ads7846_attributes[] = { | |
330 | &dev_attr_temp0.attr, | |
331 | &dev_attr_temp1.attr, | |
332 | &dev_attr_in0_input.attr, | |
333 | &dev_attr_in1_input.attr, | |
334 | NULL, | |
335 | }; | |
336 | ||
337 | static struct attribute_group ads7846_attr_group = { | |
338 | .attrs = ads7846_attributes, | |
339 | }; | |
340 | ||
341 | static struct attribute *ads7843_attributes[] = { | |
342 | &dev_attr_in0_input.attr, | |
343 | &dev_attr_in1_input.attr, | |
344 | NULL, | |
345 | }; | |
346 | ||
347 | static struct attribute_group ads7843_attr_group = { | |
348 | .attrs = ads7843_attributes, | |
349 | }; | |
350 | ||
351 | static struct attribute *ads7845_attributes[] = { | |
352 | &dev_attr_in0_input.attr, | |
353 | NULL, | |
354 | }; | |
355 | ||
356 | static struct attribute_group ads7845_attr_group = { | |
357 | .attrs = ads7845_attributes, | |
358 | }; | |
359 | ||
360 | static int ads784x_hwmon_register(struct spi_device *spi, struct ads7846 *ts) | |
361 | { | |
1beeffe4 | 362 | struct device *hwmon; |
2c8dc071 DB |
363 | int err; |
364 | ||
365 | /* hwmon sensors need a reference voltage */ | |
366 | switch (ts->model) { | |
367 | case 7846: | |
7c6d0ee1 | 368 | if (!ts->vref_mv) { |
2c8dc071 | 369 | dev_dbg(&spi->dev, "assuming 2.5V internal vREF\n"); |
7c6d0ee1 | 370 | ts->vref_mv = 2500; |
2c8dc071 DB |
371 | } |
372 | break; | |
373 | case 7845: | |
374 | case 7843: | |
7c6d0ee1 | 375 | if (!ts->vref_mv) { |
2c8dc071 DB |
376 | dev_warn(&spi->dev, |
377 | "external vREF for ADS%d not specified\n", | |
378 | ts->model); | |
379 | return 0; | |
380 | } | |
381 | break; | |
382 | } | |
383 | ||
384 | /* different chips have different sensor groups */ | |
385 | switch (ts->model) { | |
386 | case 7846: | |
387 | ts->attr_group = &ads7846_attr_group; | |
388 | break; | |
389 | case 7845: | |
390 | ts->attr_group = &ads7845_attr_group; | |
391 | break; | |
392 | case 7843: | |
393 | ts->attr_group = &ads7843_attr_group; | |
394 | break; | |
395 | default: | |
396 | dev_dbg(&spi->dev, "ADS%d not recognized\n", ts->model); | |
397 | return 0; | |
398 | } | |
399 | ||
400 | err = sysfs_create_group(&spi->dev.kobj, ts->attr_group); | |
401 | if (err) | |
402 | return err; | |
403 | ||
404 | hwmon = hwmon_device_register(&spi->dev); | |
405 | if (IS_ERR(hwmon)) { | |
406 | sysfs_remove_group(&spi->dev.kobj, ts->attr_group); | |
407 | return PTR_ERR(hwmon); | |
408 | } | |
409 | ||
410 | ts->hwmon = hwmon; | |
411 | return 0; | |
412 | } | |
413 | ||
414 | static void ads784x_hwmon_unregister(struct spi_device *spi, | |
415 | struct ads7846 *ts) | |
416 | { | |
417 | if (ts->hwmon) { | |
418 | sysfs_remove_group(&spi->dev.kobj, ts->attr_group); | |
419 | hwmon_device_unregister(ts->hwmon); | |
420 | } | |
421 | } | |
422 | ||
423 | #else | |
424 | static inline int ads784x_hwmon_register(struct spi_device *spi, | |
425 | struct ads7846 *ts) | |
426 | { | |
427 | return 0; | |
428 | } | |
429 | ||
430 | static inline void ads784x_hwmon_unregister(struct spi_device *spi, | |
431 | struct ads7846 *ts) | |
432 | { | |
433 | } | |
434 | #endif | |
ffa458c1 | 435 | |
438f2a74 ID |
436 | static int is_pen_down(struct device *dev) |
437 | { | |
2c8dc071 | 438 | struct ads7846 *ts = dev_get_drvdata(dev); |
438f2a74 ID |
439 | |
440 | return ts->pendown; | |
441 | } | |
442 | ||
443 | static ssize_t ads7846_pen_down_show(struct device *dev, | |
444 | struct device_attribute *attr, char *buf) | |
445 | { | |
446 | return sprintf(buf, "%u\n", is_pen_down(dev)); | |
447 | } | |
448 | ||
449 | static DEVICE_ATTR(pen_down, S_IRUGO, ads7846_pen_down_show, NULL); | |
450 | ||
7de90a8c ID |
451 | static ssize_t ads7846_disable_show(struct device *dev, |
452 | struct device_attribute *attr, char *buf) | |
453 | { | |
454 | struct ads7846 *ts = dev_get_drvdata(dev); | |
455 | ||
456 | return sprintf(buf, "%u\n", ts->disabled); | |
457 | } | |
458 | ||
459 | static ssize_t ads7846_disable_store(struct device *dev, | |
460 | struct device_attribute *attr, | |
461 | const char *buf, size_t count) | |
462 | { | |
463 | struct ads7846 *ts = dev_get_drvdata(dev); | |
464 | char *endp; | |
465 | int i; | |
466 | ||
467 | i = simple_strtoul(buf, &endp, 10); | |
468 | spin_lock_irq(&ts->lock); | |
469 | ||
470 | if (i) | |
471 | ads7846_disable(ts); | |
472 | else | |
473 | ads7846_enable(ts); | |
474 | ||
475 | spin_unlock_irq(&ts->lock); | |
476 | ||
477 | return count; | |
478 | } | |
479 | ||
480 | static DEVICE_ATTR(disable, 0664, ads7846_disable_show, ads7846_disable_store); | |
481 | ||
2c8dc071 | 482 | static struct attribute *ads784x_attributes[] = { |
8dd51650 DT |
483 | &dev_attr_pen_down.attr, |
484 | &dev_attr_disable.attr, | |
485 | NULL, | |
486 | }; | |
487 | ||
2c8dc071 DB |
488 | static struct attribute_group ads784x_attr_group = { |
489 | .attrs = ads784x_attributes, | |
8dd51650 DT |
490 | }; |
491 | ||
ffa458c1 DB |
492 | /*--------------------------------------------------------------------------*/ |
493 | ||
494 | /* | |
495 | * PENIRQ only kicks the timer. The timer only reissues the SPI transfer, | |
496 | * to retrieve touchscreen status. | |
497 | * | |
498 | * The SPI transfer completion callback does the real work. It reports | |
499 | * touchscreen events and reactivates the timer (or IRQ) as appropriate. | |
500 | */ | |
501 | ||
502 | static void ads7846_rx(void *ads) | |
503 | { | |
a90f7e98 | 504 | struct ads7846 *ts = ads; |
a90f7e98 | 505 | unsigned Rt; |
a90f7e98 | 506 | u16 x, y, z1, z2; |
ffa458c1 | 507 | |
da970e69 ID |
508 | /* ads7846_rx_val() did in-place conversion (including byteswap) from |
509 | * on-the-wire format as part of debouncing to get stable readings. | |
ffa458c1 | 510 | */ |
da970e69 ID |
511 | x = ts->tc.x; |
512 | y = ts->tc.y; | |
513 | z1 = ts->tc.z1; | |
514 | z2 = ts->tc.z2; | |
ffa458c1 DB |
515 | |
516 | /* range filtering */ | |
517 | if (x == MAX_12BIT) | |
518 | x = 0; | |
519 | ||
15e3589e | 520 | if (likely(x && z1)) { |
ffa458c1 DB |
521 | /* compute touch pressure resistance using equation #2 */ |
522 | Rt = z2; | |
523 | Rt -= z1; | |
524 | Rt *= x; | |
525 | Rt *= ts->x_plate_ohms; | |
526 | Rt /= z1; | |
527 | Rt = (Rt + 2047) >> 12; | |
528 | } else | |
529 | Rt = 0; | |
530 | ||
969111e9 NF |
531 | if (ts->model == 7843) |
532 | Rt = ts->pressure_max / 2; | |
533 | ||
d5b415c9 | 534 | /* Sample found inconsistent by debouncing or pressure is beyond |
1936d590 ID |
535 | * the maximum. Don't report it to user space, repeat at least |
536 | * once more the measurement | |
537 | */ | |
d5b415c9 | 538 | if (ts->tc.ignore || Rt > ts->pressure_max) { |
15e3589e ID |
539 | #ifdef VERBOSE |
540 | pr_debug("%s: ignored %d pressure %d\n", | |
541 | ts->spi->dev.bus_id, ts->tc.ignore, Rt); | |
542 | #endif | |
1936d590 | 543 | hrtimer_start(&ts->timer, ktime_set(0, TS_POLL_PERIOD), |
c9cb2e3d | 544 | HRTIMER_MODE_REL); |
d5b415c9 ID |
545 | return; |
546 | } | |
547 | ||
1d25891f SH |
548 | /* Maybe check the pendown state before reporting. This discards |
549 | * false readings when the pen is lifted. | |
550 | */ | |
551 | if (ts->penirq_recheck_delay_usecs) { | |
552 | udelay(ts->penirq_recheck_delay_usecs); | |
553 | if (!ts->get_pendown_state()) | |
554 | Rt = 0; | |
555 | } | |
556 | ||
15e3589e ID |
557 | /* NOTE: We can't rely on the pressure to determine the pen down |
558 | * state, even this controller has a pressure sensor. The pressure | |
559 | * value can fluctuate for quite a while after lifting the pen and | |
560 | * in some cases may not even settle at the expected value. | |
ffa458c1 | 561 | * |
15e3589e ID |
562 | * The only safe way to check for the pen up condition is in the |
563 | * timer by reading the pen signal state (it's a GPIO _and_ IRQ). | |
ffa458c1 | 564 | */ |
ffa458c1 | 565 | if (Rt) { |
15e3589e | 566 | struct input_dev *input = ts->input; |
ae82d5ab | 567 | |
15e3589e ID |
568 | if (!ts->pendown) { |
569 | input_report_key(input, BTN_TOUCH, 1); | |
570 | ts->pendown = 1; | |
571 | #ifdef VERBOSE | |
572 | dev_dbg(&ts->spi->dev, "DOWN\n"); | |
ffa458c1 | 573 | #endif |
15e3589e ID |
574 | } |
575 | input_report_abs(input, ABS_X, x); | |
576 | input_report_abs(input, ABS_Y, y); | |
577 | input_report_abs(input, ABS_PRESSURE, Rt); | |
ffa458c1 | 578 | |
15e3589e ID |
579 | input_sync(input); |
580 | #ifdef VERBOSE | |
581 | dev_dbg(&ts->spi->dev, "%4d/%4d/%4d\n", x, y, Rt); | |
582 | #endif | |
583 | } | |
ffa458c1 | 584 | |
c9cb2e3d TG |
585 | hrtimer_start(&ts->timer, ktime_set(0, TS_POLL_PERIOD), |
586 | HRTIMER_MODE_REL); | |
ffa458c1 DB |
587 | } |
588 | ||
da970e69 | 589 | static int ads7846_debounce(void *ads, int data_idx, int *val) |
0b7018aa ID |
590 | { |
591 | struct ads7846 *ts = ads; | |
0b7018aa | 592 | |
da970e69 ID |
593 | if (!ts->read_cnt || (abs(ts->last_read - *val) > ts->debounce_tol)) { |
594 | /* Start over collecting consistent readings. */ | |
595 | ts->read_rep = 0; | |
d5b415c9 ID |
596 | /* Repeat it, if this was the first read or the read |
597 | * wasn't consistent enough. */ | |
598 | if (ts->read_cnt < ts->debounce_max) { | |
da970e69 | 599 | ts->last_read = *val; |
d5b415c9 | 600 | ts->read_cnt++; |
da970e69 | 601 | return ADS7846_FILTER_REPEAT; |
d5b415c9 ID |
602 | } else { |
603 | /* Maximum number of debouncing reached and still | |
604 | * not enough number of consistent readings. Abort | |
605 | * the whole sample, repeat it in the next sampling | |
606 | * period. | |
607 | */ | |
d5b415c9 | 608 | ts->read_cnt = 0; |
da970e69 | 609 | return ADS7846_FILTER_IGNORE; |
d5b415c9 | 610 | } |
0b7018aa | 611 | } else { |
d5b415c9 ID |
612 | if (++ts->read_rep > ts->debounce_rep) { |
613 | /* Got a good reading for this coordinate, | |
614 | * go for the next one. */ | |
d5b415c9 ID |
615 | ts->read_cnt = 0; |
616 | ts->read_rep = 0; | |
da970e69 ID |
617 | return ADS7846_FILTER_OK; |
618 | } else { | |
d5b415c9 ID |
619 | /* Read more values that are consistent. */ |
620 | ts->read_cnt++; | |
da970e69 ID |
621 | return ADS7846_FILTER_REPEAT; |
622 | } | |
623 | } | |
624 | } | |
625 | ||
626 | static int ads7846_no_filter(void *ads, int data_idx, int *val) | |
627 | { | |
628 | return ADS7846_FILTER_OK; | |
629 | } | |
630 | ||
631 | static void ads7846_rx_val(void *ads) | |
632 | { | |
633 | struct ads7846 *ts = ads; | |
634 | struct spi_message *m; | |
635 | struct spi_transfer *t; | |
da970e69 ID |
636 | int val; |
637 | int action; | |
638 | int status; | |
639 | ||
640 | m = &ts->msg[ts->msg_idx]; | |
641 | t = list_entry(m->transfers.prev, struct spi_transfer, transfer_list); | |
da970e69 ID |
642 | |
643 | /* adjust: on-wire is a must-ignore bit, a BE12 value, then padding; | |
644 | * built from two 8 bit values written msb-first. | |
645 | */ | |
494f6857 | 646 | val = be16_to_cpup((__be16 *)t->rx_buf) >> 3; |
da970e69 ID |
647 | |
648 | action = ts->filter(ts->filter_data, ts->msg_idx, &val); | |
649 | switch (action) { | |
650 | case ADS7846_FILTER_REPEAT: | |
651 | break; | |
652 | case ADS7846_FILTER_IGNORE: | |
653 | ts->tc.ignore = 1; | |
654 | /* Last message will contain ads7846_rx() as the | |
655 | * completion function. | |
656 | */ | |
657 | m = ts->last_msg; | |
658 | break; | |
659 | case ADS7846_FILTER_OK: | |
494f6857 | 660 | *(u16 *)t->rx_buf = val; |
da970e69 ID |
661 | ts->tc.ignore = 0; |
662 | m = &ts->msg[++ts->msg_idx]; | |
663 | break; | |
664 | default: | |
665 | BUG(); | |
0b7018aa ID |
666 | } |
667 | status = spi_async(ts->spi, m); | |
668 | if (status) | |
669 | dev_err(&ts->spi->dev, "spi_async --> %d\n", | |
670 | status); | |
671 | } | |
672 | ||
c9cb2e3d | 673 | static enum hrtimer_restart ads7846_timer(struct hrtimer *handle) |
ffa458c1 | 674 | { |
1936d590 | 675 | struct ads7846 *ts = container_of(handle, struct ads7846, timer); |
ffa458c1 | 676 | int status = 0; |
0b7018aa | 677 | |
c9e617a5 ID |
678 | spin_lock_irq(&ts->lock); |
679 | ||
15e3589e ID |
680 | if (unlikely(!ts->get_pendown_state() || |
681 | device_suspended(&ts->spi->dev))) { | |
682 | if (ts->pendown) { | |
683 | struct input_dev *input = ts->input; | |
684 | ||
685 | input_report_key(input, BTN_TOUCH, 0); | |
686 | input_report_abs(input, ABS_PRESSURE, 0); | |
687 | input_sync(input); | |
688 | ||
689 | ts->pendown = 0; | |
690 | #ifdef VERBOSE | |
691 | dev_dbg(&ts->spi->dev, "UP\n"); | |
692 | #endif | |
693 | } | |
694 | ||
9084533e | 695 | /* measurement cycle ended */ |
c9e617a5 ID |
696 | if (!device_suspended(&ts->spi->dev)) { |
697 | ts->irq_disabled = 0; | |
698 | enable_irq(ts->spi->irq); | |
699 | } | |
700 | ts->pending = 0; | |
c9e617a5 ID |
701 | } else { |
702 | /* pen is still down, continue with the measurement */ | |
703 | ts->msg_idx = 0; | |
704 | status = spi_async(ts->spi, &ts->msg[0]); | |
705 | if (status) | |
706 | dev_err(&ts->spi->dev, "spi_async --> %d\n", status); | |
707 | } | |
708 | ||
709 | spin_unlock_irq(&ts->lock); | |
1936d590 | 710 | return HRTIMER_NORESTART; |
0b7018aa ID |
711 | } |
712 | ||
7d12e780 | 713 | static irqreturn_t ads7846_irq(int irq, void *handle) |
0b7018aa ID |
714 | { |
715 | struct ads7846 *ts = handle; | |
716 | unsigned long flags; | |
ffa458c1 DB |
717 | |
718 | spin_lock_irqsave(&ts->lock, flags); | |
c9e617a5 | 719 | if (likely(ts->get_pendown_state())) { |
ffa458c1 | 720 | if (!ts->irq_disabled) { |
9084533e DB |
721 | /* The ARM do_simple_IRQ() dispatcher doesn't act |
722 | * like the other dispatchers: it will report IRQs | |
723 | * even after they've been disabled. We work around | |
724 | * that here. (The "generic irq" framework may help...) | |
0b7018aa | 725 | */ |
ffa458c1 DB |
726 | ts->irq_disabled = 1; |
727 | disable_irq(ts->spi->irq); | |
0b7018aa | 728 | ts->pending = 1; |
1936d590 | 729 | hrtimer_start(&ts->timer, ktime_set(0, TS_POLL_DELAY), |
c9cb2e3d | 730 | HRTIMER_MODE_REL); |
0b7018aa | 731 | } |
ffa458c1 DB |
732 | } |
733 | spin_unlock_irqrestore(&ts->lock, flags); | |
7de90a8c ID |
734 | |
735 | return IRQ_HANDLED; | |
ffa458c1 DB |
736 | } |
737 | ||
738 | /*--------------------------------------------------------------------------*/ | |
739 | ||
7de90a8c ID |
740 | /* Must be called with ts->lock held */ |
741 | static void ads7846_disable(struct ads7846 *ts) | |
ffa458c1 | 742 | { |
7de90a8c ID |
743 | if (ts->disabled) |
744 | return; | |
ffa458c1 | 745 | |
c9e617a5 ID |
746 | ts->disabled = 1; |
747 | ||
ffa458c1 | 748 | /* are we waiting for IRQ, or polling? */ |
c9e617a5 ID |
749 | if (!ts->pending) { |
750 | ts->irq_disabled = 1; | |
751 | disable_irq(ts->spi->irq); | |
ffa458c1 | 752 | } else { |
c9e617a5 ID |
753 | /* the timer will run at least once more, and |
754 | * leave everything in a clean state, IRQ disabled | |
ffa458c1 | 755 | */ |
c9e617a5 | 756 | while (ts->pending) { |
7de90a8c | 757 | spin_unlock_irq(&ts->lock); |
c4febb94 | 758 | msleep(1); |
7de90a8c | 759 | spin_lock_irq(&ts->lock); |
ffa458c1 DB |
760 | } |
761 | } | |
762 | ||
763 | /* we know the chip's in lowpower mode since we always | |
764 | * leave it that way after every request | |
765 | */ | |
766 | ||
7de90a8c ID |
767 | } |
768 | ||
769 | /* Must be called with ts->lock held */ | |
770 | static void ads7846_enable(struct ads7846 *ts) | |
771 | { | |
772 | if (!ts->disabled) | |
773 | return; | |
774 | ||
775 | ts->disabled = 0; | |
776 | ts->irq_disabled = 0; | |
777 | enable_irq(ts->spi->irq); | |
778 | } | |
779 | ||
780 | static int ads7846_suspend(struct spi_device *spi, pm_message_t message) | |
781 | { | |
782 | struct ads7846 *ts = dev_get_drvdata(&spi->dev); | |
783 | ||
784 | spin_lock_irq(&ts->lock); | |
785 | ||
fbb38e30 | 786 | ts->is_suspended = 1; |
7de90a8c ID |
787 | ads7846_disable(ts); |
788 | ||
789 | spin_unlock_irq(&ts->lock); | |
790 | ||
ffa458c1 | 791 | return 0; |
7de90a8c | 792 | |
ffa458c1 DB |
793 | } |
794 | ||
2e5a7bd9 | 795 | static int ads7846_resume(struct spi_device *spi) |
ffa458c1 | 796 | { |
2e5a7bd9 | 797 | struct ads7846 *ts = dev_get_drvdata(&spi->dev); |
ffa458c1 | 798 | |
7de90a8c ID |
799 | spin_lock_irq(&ts->lock); |
800 | ||
fbb38e30 | 801 | ts->is_suspended = 0; |
7de90a8c ID |
802 | ads7846_enable(ts); |
803 | ||
804 | spin_unlock_irq(&ts->lock); | |
805 | ||
ffa458c1 DB |
806 | return 0; |
807 | } | |
808 | ||
2e5a7bd9 | 809 | static int __devinit ads7846_probe(struct spi_device *spi) |
ffa458c1 | 810 | { |
ffa458c1 | 811 | struct ads7846 *ts; |
a90f7e98 | 812 | struct input_dev *input_dev; |
2e5a7bd9 | 813 | struct ads7846_platform_data *pdata = spi->dev.platform_data; |
0b7018aa | 814 | struct spi_message *m; |
ffa458c1 | 815 | struct spi_transfer *x; |
de2defd9 | 816 | int vref; |
a90f7e98 | 817 | int err; |
ffa458c1 DB |
818 | |
819 | if (!spi->irq) { | |
2e5a7bd9 | 820 | dev_dbg(&spi->dev, "no IRQ?\n"); |
ffa458c1 DB |
821 | return -ENODEV; |
822 | } | |
823 | ||
824 | if (!pdata) { | |
2e5a7bd9 | 825 | dev_dbg(&spi->dev, "no platform data?\n"); |
ffa458c1 DB |
826 | return -ENODEV; |
827 | } | |
828 | ||
829 | /* don't exceed max specified sample rate */ | |
d93f70b2 | 830 | if (spi->max_speed_hz > (125000 * SAMPLE_BITS)) { |
2e5a7bd9 | 831 | dev_dbg(&spi->dev, "f(sample) %d KHz?\n", |
d93f70b2 | 832 | (spi->max_speed_hz/SAMPLE_BITS)/1000); |
ffa458c1 DB |
833 | return -EINVAL; |
834 | } | |
835 | ||
9084533e DB |
836 | /* REVISIT when the irq can be triggered active-low, or if for some |
837 | * reason the touchscreen isn't hooked up, we don't need to access | |
838 | * the pendown state. | |
839 | */ | |
c9e617a5 ID |
840 | if (pdata->get_pendown_state == NULL) { |
841 | dev_dbg(&spi->dev, "no get_pendown_state function?\n"); | |
842 | return -EINVAL; | |
843 | } | |
844 | ||
9084533e DB |
845 | /* We'd set TX wordsize 8 bits and RX wordsize to 13 bits ... except |
846 | * that even if the hardware can do that, the SPI controller driver | |
847 | * may not. So we stick to very-portable 8 bit words, both RX and TX. | |
ffa458c1 | 848 | */ |
9084533e | 849 | spi->bits_per_word = 8; |
230ffc8e | 850 | spi->mode = SPI_MODE_0; |
7937e86a ID |
851 | err = spi_setup(spi); |
852 | if (err < 0) | |
853 | return err; | |
ffa458c1 | 854 | |
a90f7e98 DT |
855 | ts = kzalloc(sizeof(struct ads7846), GFP_KERNEL); |
856 | input_dev = input_allocate_device(); | |
857 | if (!ts || !input_dev) { | |
858 | err = -ENOMEM; | |
859 | goto err_free_mem; | |
860 | } | |
ffa458c1 | 861 | |
2e5a7bd9 | 862 | dev_set_drvdata(&spi->dev, ts); |
ffa458c1 DB |
863 | |
864 | ts->spi = spi; | |
a90f7e98 | 865 | ts->input = input_dev; |
7c6d0ee1 | 866 | ts->vref_mv = pdata->vref_mv; |
ffa458c1 | 867 | |
c9cb2e3d | 868 | hrtimer_init(&ts->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); |
ffa458c1 DB |
869 | ts->timer.function = ads7846_timer; |
870 | ||
7de90a8c ID |
871 | spin_lock_init(&ts->lock); |
872 | ||
ffa458c1 DB |
873 | ts->model = pdata->model ? : 7846; |
874 | ts->vref_delay_usecs = pdata->vref_delay_usecs ? : 100; | |
875 | ts->x_plate_ohms = pdata->x_plate_ohms ? : 400; | |
d5b415c9 | 876 | ts->pressure_max = pdata->pressure_max ? : ~0; |
da970e69 ID |
877 | |
878 | if (pdata->filter != NULL) { | |
879 | if (pdata->filter_init != NULL) { | |
880 | err = pdata->filter_init(pdata, &ts->filter_data); | |
881 | if (err < 0) | |
882 | goto err_free_mem; | |
883 | } | |
884 | ts->filter = pdata->filter; | |
885 | ts->filter_cleanup = pdata->filter_cleanup; | |
886 | } else if (pdata->debounce_max) { | |
d5b415c9 | 887 | ts->debounce_max = pdata->debounce_max; |
da970e69 ID |
888 | if (ts->debounce_max < 2) |
889 | ts->debounce_max = 2; | |
d5b415c9 ID |
890 | ts->debounce_tol = pdata->debounce_tol; |
891 | ts->debounce_rep = pdata->debounce_rep; | |
da970e69 ID |
892 | ts->filter = ads7846_debounce; |
893 | ts->filter_data = ts; | |
d5b415c9 | 894 | } else |
da970e69 | 895 | ts->filter = ads7846_no_filter; |
c9e617a5 | 896 | ts->get_pendown_state = pdata->get_pendown_state; |
ffa458c1 | 897 | |
1d25891f SH |
898 | if (pdata->penirq_recheck_delay_usecs) |
899 | ts->penirq_recheck_delay_usecs = | |
900 | pdata->penirq_recheck_delay_usecs; | |
901 | ||
a90f7e98 | 902 | snprintf(ts->phys, sizeof(ts->phys), "%s/input0", spi->dev.bus_id); |
ffa458c1 | 903 | |
a90f7e98 DT |
904 | input_dev->name = "ADS784x Touchscreen"; |
905 | input_dev->phys = ts->phys; | |
a5394fb0 | 906 | input_dev->dev.parent = &spi->dev; |
ffa458c1 | 907 | |
7b19ada2 JS |
908 | input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS); |
909 | input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH); | |
a90f7e98 | 910 | input_set_abs_params(input_dev, ABS_X, |
ffa458c1 DB |
911 | pdata->x_min ? : 0, |
912 | pdata->x_max ? : MAX_12BIT, | |
913 | 0, 0); | |
a90f7e98 | 914 | input_set_abs_params(input_dev, ABS_Y, |
ffa458c1 DB |
915 | pdata->y_min ? : 0, |
916 | pdata->y_max ? : MAX_12BIT, | |
917 | 0, 0); | |
a90f7e98 | 918 | input_set_abs_params(input_dev, ABS_PRESSURE, |
ffa458c1 DB |
919 | pdata->pressure_min, pdata->pressure_max, 0, 0); |
920 | ||
de2defd9 ID |
921 | vref = pdata->keep_vref_on; |
922 | ||
ffa458c1 DB |
923 | /* set up the transfers to read touchscreen state; this assumes we |
924 | * use formula #2 for pressure, not #3. | |
925 | */ | |
0b7018aa | 926 | m = &ts->msg[0]; |
ffa458c1 DB |
927 | x = ts->xfer; |
928 | ||
0b7018aa ID |
929 | spi_message_init(m); |
930 | ||
ffa458c1 | 931 | /* y- still on; turn on only y+ (and ADC) */ |
de2defd9 | 932 | ts->read_y = READ_Y(vref); |
d93f70b2 | 933 | x->tx_buf = &ts->read_y; |
ffa458c1 | 934 | x->len = 1; |
0b7018aa | 935 | spi_message_add_tail(x, m); |
d93f70b2 | 936 | |
ffa458c1 DB |
937 | x++; |
938 | x->rx_buf = &ts->tc.y; | |
939 | x->len = 2; | |
0b7018aa ID |
940 | spi_message_add_tail(x, m); |
941 | ||
e4f48861 SH |
942 | /* the first sample after switching drivers can be low quality; |
943 | * optionally discard it, using a second one after the signals | |
944 | * have had enough time to stabilize. | |
945 | */ | |
946 | if (pdata->settle_delay_usecs) { | |
947 | x->delay_usecs = pdata->settle_delay_usecs; | |
948 | ||
949 | x++; | |
950 | x->tx_buf = &ts->read_y; | |
951 | x->len = 1; | |
952 | spi_message_add_tail(x, m); | |
953 | ||
954 | x++; | |
955 | x->rx_buf = &ts->tc.y; | |
956 | x->len = 2; | |
957 | spi_message_add_tail(x, m); | |
958 | } | |
959 | ||
da970e69 | 960 | m->complete = ads7846_rx_val; |
0b7018aa ID |
961 | m->context = ts; |
962 | ||
963 | m++; | |
964 | spi_message_init(m); | |
965 | ||
966 | /* turn y- off, x+ on, then leave in lowpower */ | |
967 | x++; | |
de2defd9 | 968 | ts->read_x = READ_X(vref); |
0b7018aa ID |
969 | x->tx_buf = &ts->read_x; |
970 | x->len = 1; | |
971 | spi_message_add_tail(x, m); | |
972 | ||
973 | x++; | |
974 | x->rx_buf = &ts->tc.x; | |
975 | x->len = 2; | |
976 | spi_message_add_tail(x, m); | |
977 | ||
e4f48861 SH |
978 | /* ... maybe discard first sample ... */ |
979 | if (pdata->settle_delay_usecs) { | |
980 | x->delay_usecs = pdata->settle_delay_usecs; | |
981 | ||
982 | x++; | |
983 | x->tx_buf = &ts->read_x; | |
984 | x->len = 1; | |
985 | spi_message_add_tail(x, m); | |
986 | ||
987 | x++; | |
988 | x->rx_buf = &ts->tc.x; | |
989 | x->len = 2; | |
990 | spi_message_add_tail(x, m); | |
991 | } | |
992 | ||
da970e69 | 993 | m->complete = ads7846_rx_val; |
0b7018aa | 994 | m->context = ts; |
ffa458c1 DB |
995 | |
996 | /* turn y+ off, x- on; we'll use formula #2 */ | |
997 | if (ts->model == 7846) { | |
0b7018aa ID |
998 | m++; |
999 | spi_message_init(m); | |
1000 | ||
d93f70b2 | 1001 | x++; |
de2defd9 | 1002 | ts->read_z1 = READ_Z1(vref); |
d93f70b2 | 1003 | x->tx_buf = &ts->read_z1; |
ffa458c1 | 1004 | x->len = 1; |
0b7018aa | 1005 | spi_message_add_tail(x, m); |
d93f70b2 | 1006 | |
ffa458c1 DB |
1007 | x++; |
1008 | x->rx_buf = &ts->tc.z1; | |
1009 | x->len = 2; | |
0b7018aa ID |
1010 | spi_message_add_tail(x, m); |
1011 | ||
e4f48861 SH |
1012 | /* ... maybe discard first sample ... */ |
1013 | if (pdata->settle_delay_usecs) { | |
1014 | x->delay_usecs = pdata->settle_delay_usecs; | |
1015 | ||
1016 | x++; | |
1017 | x->tx_buf = &ts->read_z1; | |
1018 | x->len = 1; | |
1019 | spi_message_add_tail(x, m); | |
1020 | ||
1021 | x++; | |
1022 | x->rx_buf = &ts->tc.z1; | |
1023 | x->len = 2; | |
1024 | spi_message_add_tail(x, m); | |
1025 | } | |
1026 | ||
da970e69 | 1027 | m->complete = ads7846_rx_val; |
0b7018aa ID |
1028 | m->context = ts; |
1029 | ||
1030 | m++; | |
1031 | spi_message_init(m); | |
ffa458c1 | 1032 | |
d93f70b2 | 1033 | x++; |
de2defd9 | 1034 | ts->read_z2 = READ_Z2(vref); |
d93f70b2 | 1035 | x->tx_buf = &ts->read_z2; |
ffa458c1 | 1036 | x->len = 1; |
0b7018aa | 1037 | spi_message_add_tail(x, m); |
d93f70b2 | 1038 | |
ffa458c1 DB |
1039 | x++; |
1040 | x->rx_buf = &ts->tc.z2; | |
1041 | x->len = 2; | |
0b7018aa | 1042 | spi_message_add_tail(x, m); |
ffa458c1 | 1043 | |
e4f48861 SH |
1044 | /* ... maybe discard first sample ... */ |
1045 | if (pdata->settle_delay_usecs) { | |
1046 | x->delay_usecs = pdata->settle_delay_usecs; | |
1047 | ||
1048 | x++; | |
1049 | x->tx_buf = &ts->read_z2; | |
1050 | x->len = 1; | |
1051 | spi_message_add_tail(x, m); | |
1052 | ||
1053 | x++; | |
1054 | x->rx_buf = &ts->tc.z2; | |
1055 | x->len = 2; | |
1056 | spi_message_add_tail(x, m); | |
1057 | } | |
1058 | ||
da970e69 | 1059 | m->complete = ads7846_rx_val; |
0b7018aa ID |
1060 | m->context = ts; |
1061 | } | |
53a0ef89 ID |
1062 | |
1063 | /* power down */ | |
0b7018aa ID |
1064 | m++; |
1065 | spi_message_init(m); | |
1066 | ||
53a0ef89 ID |
1067 | x++; |
1068 | ts->pwrdown = PWRDOWN; | |
1069 | x->tx_buf = &ts->pwrdown; | |
1070 | x->len = 1; | |
0b7018aa | 1071 | spi_message_add_tail(x, m); |
53a0ef89 ID |
1072 | |
1073 | x++; | |
1074 | x->rx_buf = &ts->dummy; | |
1075 | x->len = 2; | |
d93f70b2 | 1076 | CS_CHANGE(*x); |
0b7018aa | 1077 | spi_message_add_tail(x, m); |
ffa458c1 | 1078 | |
0b7018aa ID |
1079 | m->complete = ads7846_rx; |
1080 | m->context = ts; | |
ffa458c1 | 1081 | |
d5b415c9 ID |
1082 | ts->last_msg = m; |
1083 | ||
dace1453 | 1084 | if (request_irq(spi->irq, ads7846_irq, IRQF_TRIGGER_FALLING, |
9084533e | 1085 | spi->dev.driver->name, ts)) { |
2e5a7bd9 | 1086 | dev_dbg(&spi->dev, "irq %d busy?\n", spi->irq); |
a90f7e98 | 1087 | err = -EBUSY; |
da970e69 | 1088 | goto err_cleanup_filter; |
ffa458c1 | 1089 | } |
ffa458c1 | 1090 | |
2c8dc071 DB |
1091 | err = ads784x_hwmon_register(spi, ts); |
1092 | if (err) | |
1093 | goto err_free_irq; | |
1094 | ||
2e5a7bd9 | 1095 | dev_info(&spi->dev, "touchscreen, irq %d\n", spi->irq); |
ffa458c1 | 1096 | |
2c8dc071 | 1097 | /* take a first sample, leaving nPENIRQ active and vREF off; avoid |
ffa458c1 DB |
1098 | * the touchscreen, in case it's not connected. |
1099 | */ | |
2e5a7bd9 | 1100 | (void) ads7846_read12_ser(&spi->dev, |
ffa458c1 DB |
1101 | READ_12BIT_SER(vaux) | ADS_PD10_ALL_ON); |
1102 | ||
2c8dc071 | 1103 | err = sysfs_create_group(&spi->dev.kobj, &ads784x_attr_group); |
8dd51650 | 1104 | if (err) |
2c8dc071 | 1105 | goto err_remove_hwmon; |
7de90a8c | 1106 | |
a90f7e98 DT |
1107 | err = input_register_device(input_dev); |
1108 | if (err) | |
8dd51650 | 1109 | goto err_remove_attr_group; |
a90f7e98 | 1110 | |
ffa458c1 | 1111 | return 0; |
a90f7e98 | 1112 | |
8dd51650 | 1113 | err_remove_attr_group: |
2c8dc071 DB |
1114 | sysfs_remove_group(&spi->dev.kobj, &ads784x_attr_group); |
1115 | err_remove_hwmon: | |
1116 | ads784x_hwmon_unregister(spi, ts); | |
8dd51650 | 1117 | err_free_irq: |
a90f7e98 | 1118 | free_irq(spi->irq, ts); |
da970e69 ID |
1119 | err_cleanup_filter: |
1120 | if (ts->filter_cleanup) | |
1121 | ts->filter_cleanup(ts->filter_data); | |
a90f7e98 DT |
1122 | err_free_mem: |
1123 | input_free_device(input_dev); | |
1124 | kfree(ts); | |
1125 | return err; | |
ffa458c1 DB |
1126 | } |
1127 | ||
2e5a7bd9 | 1128 | static int __devexit ads7846_remove(struct spi_device *spi) |
ffa458c1 | 1129 | { |
2e5a7bd9 | 1130 | struct ads7846 *ts = dev_get_drvdata(&spi->dev); |
ffa458c1 | 1131 | |
2c8dc071 | 1132 | ads784x_hwmon_unregister(spi, ts); |
7de90a8c ID |
1133 | input_unregister_device(ts->input); |
1134 | ||
2e5a7bd9 | 1135 | ads7846_suspend(spi, PMSG_SUSPEND); |
ffa458c1 | 1136 | |
2c8dc071 | 1137 | sysfs_remove_group(&spi->dev.kobj, &ads784x_attr_group); |
ffa458c1 | 1138 | |
7de90a8c | 1139 | free_irq(ts->spi->irq, ts); |
c9e617a5 ID |
1140 | /* suspend left the IRQ disabled */ |
1141 | enable_irq(ts->spi->irq); | |
7de90a8c | 1142 | |
da970e69 ID |
1143 | if (ts->filter_cleanup) |
1144 | ts->filter_cleanup(ts->filter_data); | |
1145 | ||
ffa458c1 DB |
1146 | kfree(ts); |
1147 | ||
2e5a7bd9 | 1148 | dev_dbg(&spi->dev, "unregistered touchscreen\n"); |
ffa458c1 DB |
1149 | return 0; |
1150 | } | |
1151 | ||
2e5a7bd9 DB |
1152 | static struct spi_driver ads7846_driver = { |
1153 | .driver = { | |
1154 | .name = "ads7846", | |
1155 | .bus = &spi_bus_type, | |
1156 | .owner = THIS_MODULE, | |
1157 | }, | |
ffa458c1 | 1158 | .probe = ads7846_probe, |
2e5a7bd9 | 1159 | .remove = __devexit_p(ads7846_remove), |
ffa458c1 DB |
1160 | .suspend = ads7846_suspend, |
1161 | .resume = ads7846_resume, | |
1162 | }; | |
1163 | ||
1164 | static int __init ads7846_init(void) | |
1165 | { | |
2e5a7bd9 | 1166 | return spi_register_driver(&ads7846_driver); |
ffa458c1 DB |
1167 | } |
1168 | module_init(ads7846_init); | |
1169 | ||
1170 | static void __exit ads7846_exit(void) | |
1171 | { | |
2e5a7bd9 | 1172 | spi_unregister_driver(&ads7846_driver); |
ffa458c1 DB |
1173 | } |
1174 | module_exit(ads7846_exit); | |
1175 | ||
1176 | MODULE_DESCRIPTION("ADS7846 TouchScreen Driver"); | |
1177 | MODULE_LICENSE("GPL"); |