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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 | */ | |
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> | |
4d5975e5 | 27 | #include <linux/gpio.h> |
ffa458c1 DB |
28 | #include <linux/spi/spi.h> |
29 | #include <linux/spi/ads7846.h> | |
91143379 | 30 | #include <linux/regulator/consumer.h> |
3ac8bf07 | 31 | #include <asm/irq.h> |
ffa458c1 | 32 | |
ffa458c1 | 33 | /* |
9084533e | 34 | * This code has been heavily tested on a Nokia 770, and lightly |
52ce4eaa | 35 | * tested on other ads7846 devices (OSK/Mistral, Lubbock, Spitz). |
bff0de5f | 36 | * TSC2046 is just newer ads7846 silicon. |
969111e9 NF |
37 | * Support for ads7843 tested on Atmel at91sam926x-EK. |
38 | * Support for ads7845 has only been stubbed in. | |
ffa458c1 | 39 | * |
7de90a8c ID |
40 | * IRQ handling needs a workaround because of a shortcoming in handling |
41 | * edge triggered IRQs on some platforms like the OMAP1/2. These | |
42 | * platforms don't handle the ARM lazy IRQ disabling properly, thus we | |
43 | * have to maintain our own SW IRQ disabled status. This should be | |
44 | * removed as soon as the affected platform's IRQ handling is fixed. | |
45 | * | |
52ce4eaa | 46 | * App note sbaa036 talks in more detail about accurate sampling... |
ffa458c1 DB |
47 | * that ought to help in situations like LCDs inducing noise (which |
48 | * can also be helped by using synch signals) and more generally. | |
7de90a8c ID |
49 | * This driver tries to utilize the measures described in the app |
50 | * note. The strength of filtering can be set in the board-* specific | |
51 | * files. | |
ffa458c1 DB |
52 | */ |
53 | ||
1936d590 ID |
54 | #define TS_POLL_DELAY (1 * 1000000) /* ns delay before the first sample */ |
55 | #define TS_POLL_PERIOD (5 * 1000000) /* ns delay between samples */ | |
ffa458c1 | 56 | |
d93f70b2 DB |
57 | /* this driver doesn't aim at the peak continuous sample rate */ |
58 | #define SAMPLE_BITS (8 /*cmd*/ + 16 /*sample*/ + 2 /* before, after */) | |
59 | ||
ffa458c1 DB |
60 | struct ts_event { |
61 | /* For portability, we can't read 12 bit values using SPI (which | |
62 | * would make the controller deliver them as native byteorder u16 | |
d93f70b2 | 63 | * with msbs zeroed). Instead, we read them as two 8-bit values, |
da970e69 | 64 | * *** WHICH NEED BYTESWAPPING *** and range adjustment. |
ffa458c1 | 65 | */ |
da970e69 ID |
66 | u16 x; |
67 | u16 y; | |
68 | u16 z1, z2; | |
2c8dc071 | 69 | int ignore; |
ffa458c1 DB |
70 | }; |
71 | ||
e8f462d2 DT |
72 | /* |
73 | * We allocate this separately to avoid cache line sharing issues when | |
74 | * driver is used with DMA-based SPI controllers (like atmel_spi) on | |
75 | * systems where main memory is not DMA-coherent (most non-x86 boards). | |
76 | */ | |
77 | struct ads7846_packet { | |
78 | u8 read_x, read_y, read_z1, read_z2, pwrdown; | |
79 | u16 dummy; /* for the pwrdown read */ | |
80 | struct ts_event tc; | |
81 | }; | |
82 | ||
ffa458c1 | 83 | struct ads7846 { |
a90f7e98 | 84 | struct input_dev *input; |
ffa458c1 | 85 | char phys[32]; |
b58895f8 | 86 | char name[32]; |
ffa458c1 DB |
87 | |
88 | struct spi_device *spi; | |
91143379 | 89 | struct regulator *reg; |
2c8dc071 DB |
90 | |
91 | #if defined(CONFIG_HWMON) || defined(CONFIG_HWMON_MODULE) | |
8dd51650 | 92 | struct attribute_group *attr_group; |
1beeffe4 | 93 | struct device *hwmon; |
2c8dc071 DB |
94 | #endif |
95 | ||
ffa458c1 | 96 | u16 model; |
7c6d0ee1 | 97 | u16 vref_mv; |
ffa458c1 DB |
98 | u16 vref_delay_usecs; |
99 | u16 x_plate_ohms; | |
d5b415c9 | 100 | u16 pressure_max; |
ffa458c1 | 101 | |
86579a4c MR |
102 | bool swap_xy; |
103 | ||
e8f462d2 | 104 | struct ads7846_packet *packet; |
ffa458c1 | 105 | |
e4f48861 | 106 | struct spi_transfer xfer[18]; |
0b7018aa | 107 | struct spi_message msg[5]; |
d5b415c9 | 108 | struct spi_message *last_msg; |
0b7018aa ID |
109 | int msg_idx; |
110 | int read_cnt; | |
d5b415c9 | 111 | int read_rep; |
0b7018aa ID |
112 | int last_read; |
113 | ||
114 | u16 debounce_max; | |
115 | u16 debounce_tol; | |
d5b415c9 | 116 | u16 debounce_rep; |
ffa458c1 | 117 | |
1d25891f SH |
118 | u16 penirq_recheck_delay_usecs; |
119 | ||
ffa458c1 | 120 | spinlock_t lock; |
1936d590 | 121 | struct hrtimer timer; |
ffa458c1 DB |
122 | unsigned pendown:1; /* P: lock */ |
123 | unsigned pending:1; /* P: lock */ | |
124 | // FIXME remove "irq_disabled" | |
125 | unsigned irq_disabled:1; /* P: lock */ | |
7de90a8c | 126 | unsigned disabled:1; |
fbb38e30 | 127 | unsigned is_suspended:1; |
c9e617a5 | 128 | |
da970e69 ID |
129 | int (*filter)(void *data, int data_idx, int *val); |
130 | void *filter_data; | |
131 | void (*filter_cleanup)(void *data); | |
c9e617a5 | 132 | int (*get_pendown_state)(void); |
4d5975e5 | 133 | int gpio_pendown; |
fd746d54 EM |
134 | |
135 | void (*wait_for_sync)(void); | |
ffa458c1 DB |
136 | }; |
137 | ||
138 | /* leave chip selected when we're done, for quicker re-select? */ | |
139 | #if 0 | |
140 | #define CS_CHANGE(xfer) ((xfer).cs_change = 1) | |
141 | #else | |
142 | #define CS_CHANGE(xfer) ((xfer).cs_change = 0) | |
143 | #endif | |
144 | ||
145 | /*--------------------------------------------------------------------------*/ | |
146 | ||
147 | /* The ADS7846 has touchscreen and other sensors. | |
148 | * Earlier ads784x chips are somewhat compatible. | |
149 | */ | |
150 | #define ADS_START (1 << 7) | |
151 | #define ADS_A2A1A0_d_y (1 << 4) /* differential */ | |
152 | #define ADS_A2A1A0_d_z1 (3 << 4) /* differential */ | |
153 | #define ADS_A2A1A0_d_z2 (4 << 4) /* differential */ | |
154 | #define ADS_A2A1A0_d_x (5 << 4) /* differential */ | |
155 | #define ADS_A2A1A0_temp0 (0 << 4) /* non-differential */ | |
156 | #define ADS_A2A1A0_vbatt (2 << 4) /* non-differential */ | |
157 | #define ADS_A2A1A0_vaux (6 << 4) /* non-differential */ | |
158 | #define ADS_A2A1A0_temp1 (7 << 4) /* non-differential */ | |
159 | #define ADS_8_BIT (1 << 3) | |
160 | #define ADS_12_BIT (0 << 3) | |
161 | #define ADS_SER (1 << 2) /* non-differential */ | |
162 | #define ADS_DFR (0 << 2) /* differential */ | |
163 | #define ADS_PD10_PDOWN (0 << 0) /* lowpower mode + penirq */ | |
164 | #define ADS_PD10_ADC_ON (1 << 0) /* ADC on */ | |
165 | #define ADS_PD10_REF_ON (2 << 0) /* vREF on + penirq */ | |
166 | #define ADS_PD10_ALL_ON (3 << 0) /* ADC + vREF on */ | |
167 | ||
168 | #define MAX_12BIT ((1<<12)-1) | |
169 | ||
170 | /* leave ADC powered up (disables penirq) between differential samples */ | |
de2defd9 ID |
171 | #define READ_12BIT_DFR(x, adc, vref) (ADS_START | ADS_A2A1A0_d_ ## x \ |
172 | | ADS_12_BIT | ADS_DFR | \ | |
173 | (adc ? ADS_PD10_ADC_ON : 0) | (vref ? ADS_PD10_REF_ON : 0)) | |
ffa458c1 | 174 | |
de2defd9 ID |
175 | #define READ_Y(vref) (READ_12BIT_DFR(y, 1, vref)) |
176 | #define READ_Z1(vref) (READ_12BIT_DFR(z1, 1, vref)) | |
177 | #define READ_Z2(vref) (READ_12BIT_DFR(z2, 1, vref)) | |
53a0ef89 | 178 | |
de2defd9 ID |
179 | #define READ_X(vref) (READ_12BIT_DFR(x, 1, vref)) |
180 | #define PWRDOWN (READ_12BIT_DFR(y, 0, 0)) /* LAST */ | |
ffa458c1 DB |
181 | |
182 | /* single-ended samples need to first power up reference voltage; | |
183 | * we leave both ADC and VREF powered | |
184 | */ | |
185 | #define READ_12BIT_SER(x) (ADS_START | ADS_A2A1A0_ ## x \ | |
186 | | ADS_12_BIT | ADS_SER) | |
187 | ||
de2defd9 ID |
188 | #define REF_ON (READ_12BIT_DFR(x, 1, 1)) |
189 | #define REF_OFF (READ_12BIT_DFR(y, 0, 0)) | |
ffa458c1 DB |
190 | |
191 | /*--------------------------------------------------------------------------*/ | |
192 | ||
193 | /* | |
194 | * Non-touchscreen sensors only use single-ended conversions. | |
2c8dc071 DB |
195 | * The range is GND..vREF. The ads7843 and ads7835 must use external vREF; |
196 | * ads7846 lets that pin be unconnected, to use internal vREF. | |
ffa458c1 DB |
197 | */ |
198 | ||
199 | struct ser_req { | |
d93f70b2 | 200 | u8 ref_on; |
ffa458c1 | 201 | u8 command; |
d93f70b2 | 202 | u8 ref_off; |
ffa458c1 DB |
203 | u16 scratch; |
204 | __be16 sample; | |
205 | struct spi_message msg; | |
206 | struct spi_transfer xfer[6]; | |
207 | }; | |
208 | ||
7de90a8c ID |
209 | static void ads7846_enable(struct ads7846 *ts); |
210 | static void ads7846_disable(struct ads7846 *ts); | |
211 | ||
c9e617a5 ID |
212 | static int device_suspended(struct device *dev) |
213 | { | |
214 | struct ads7846 *ts = dev_get_drvdata(dev); | |
fbb38e30 | 215 | return ts->is_suspended || ts->disabled; |
c9e617a5 ID |
216 | } |
217 | ||
ffa458c1 DB |
218 | static int ads7846_read12_ser(struct device *dev, unsigned command) |
219 | { | |
220 | struct spi_device *spi = to_spi_device(dev); | |
221 | struct ads7846 *ts = dev_get_drvdata(dev); | |
e94b1766 | 222 | struct ser_req *req = kzalloc(sizeof *req, GFP_KERNEL); |
ffa458c1 | 223 | int status; |
2c8dc071 | 224 | int use_internal; |
ffa458c1 DB |
225 | |
226 | if (!req) | |
227 | return -ENOMEM; | |
228 | ||
0b7018aa | 229 | spi_message_init(&req->msg); |
8275c642 | 230 | |
2c8dc071 DB |
231 | /* FIXME boards with ads7846 might use external vref instead ... */ |
232 | use_internal = (ts->model == 7846); | |
233 | ||
234 | /* maybe turn on internal vREF, and let it settle */ | |
235 | if (use_internal) { | |
236 | req->ref_on = REF_ON; | |
237 | req->xfer[0].tx_buf = &req->ref_on; | |
238 | req->xfer[0].len = 1; | |
239 | spi_message_add_tail(&req->xfer[0], &req->msg); | |
240 | ||
241 | req->xfer[1].rx_buf = &req->scratch; | |
242 | req->xfer[1].len = 2; | |
243 | ||
244 | /* for 1uF, settle for 800 usec; no cap, 100 usec. */ | |
245 | req->xfer[1].delay_usecs = ts->vref_delay_usecs; | |
246 | spi_message_add_tail(&req->xfer[1], &req->msg); | |
247 | } | |
ffa458c1 DB |
248 | |
249 | /* take sample */ | |
250 | req->command = (u8) command; | |
251 | req->xfer[2].tx_buf = &req->command; | |
252 | req->xfer[2].len = 1; | |
2c8dc071 DB |
253 | spi_message_add_tail(&req->xfer[2], &req->msg); |
254 | ||
ffa458c1 DB |
255 | req->xfer[3].rx_buf = &req->sample; |
256 | req->xfer[3].len = 2; | |
2c8dc071 | 257 | spi_message_add_tail(&req->xfer[3], &req->msg); |
ffa458c1 DB |
258 | |
259 | /* REVISIT: take a few more samples, and compare ... */ | |
260 | ||
969111e9 NF |
261 | /* converter in low power mode & enable PENIRQ */ |
262 | req->ref_off = PWRDOWN; | |
263 | req->xfer[4].tx_buf = &req->ref_off; | |
264 | req->xfer[4].len = 1; | |
265 | spi_message_add_tail(&req->xfer[4], &req->msg); | |
266 | ||
267 | req->xfer[5].rx_buf = &req->scratch; | |
268 | req->xfer[5].len = 2; | |
269 | CS_CHANGE(req->xfer[5]); | |
270 | spi_message_add_tail(&req->xfer[5], &req->msg); | |
ffa458c1 | 271 | |
c9e617a5 | 272 | ts->irq_disabled = 1; |
ffa458c1 DB |
273 | disable_irq(spi->irq); |
274 | status = spi_sync(spi, &req->msg); | |
c9e617a5 | 275 | ts->irq_disabled = 0; |
ffa458c1 DB |
276 | enable_irq(spi->irq); |
277 | ||
c24b2602 MP |
278 | if (status == 0) { |
279 | /* on-wire is a must-ignore bit, a BE12 value, then padding */ | |
7c6d0ee1 DB |
280 | status = be16_to_cpu(req->sample); |
281 | status = status >> 3; | |
282 | status &= 0x0fff; | |
c24b2602 | 283 | } |
ffa458c1 | 284 | |
9084533e | 285 | kfree(req); |
7c6d0ee1 | 286 | return status; |
ffa458c1 DB |
287 | } |
288 | ||
2c8dc071 DB |
289 | #if defined(CONFIG_HWMON) || defined(CONFIG_HWMON_MODULE) |
290 | ||
291 | #define SHOW(name, var, adjust) static ssize_t \ | |
ffa458c1 DB |
292 | name ## _show(struct device *dev, struct device_attribute *attr, char *buf) \ |
293 | { \ | |
2c8dc071 | 294 | struct ads7846 *ts = dev_get_drvdata(dev); \ |
ffa458c1 | 295 | ssize_t v = ads7846_read12_ser(dev, \ |
2c8dc071 | 296 | READ_12BIT_SER(var) | ADS_PD10_ALL_ON); \ |
ffa458c1 DB |
297 | if (v < 0) \ |
298 | return v; \ | |
2c8dc071 | 299 | return sprintf(buf, "%u\n", adjust(ts, v)); \ |
ffa458c1 DB |
300 | } \ |
301 | static DEVICE_ATTR(name, S_IRUGO, name ## _show, NULL); | |
302 | ||
2c8dc071 | 303 | |
b731d7b6 | 304 | /* Sysfs conventions report temperatures in millidegrees Celsius. |
2c8dc071 DB |
305 | * ADS7846 could use the low-accuracy two-sample scheme, but can't do the high |
306 | * accuracy scheme without calibration data. For now we won't try either; | |
307 | * userspace sees raw sensor values, and must scale/calibrate appropriately. | |
308 | */ | |
309 | static inline unsigned null_adjust(struct ads7846 *ts, ssize_t v) | |
310 | { | |
311 | return v; | |
312 | } | |
313 | ||
314 | SHOW(temp0, temp0, null_adjust) /* temp1_input */ | |
315 | SHOW(temp1, temp1, null_adjust) /* temp2_input */ | |
316 | ||
317 | ||
318 | /* sysfs conventions report voltages in millivolts. We can convert voltages | |
319 | * if we know vREF. userspace may need to scale vAUX to match the board's | |
320 | * external resistors; we assume that vBATT only uses the internal ones. | |
321 | */ | |
322 | static inline unsigned vaux_adjust(struct ads7846 *ts, ssize_t v) | |
323 | { | |
324 | unsigned retval = v; | |
325 | ||
326 | /* external resistors may scale vAUX into 0..vREF */ | |
7c6d0ee1 | 327 | retval *= ts->vref_mv; |
2c8dc071 DB |
328 | retval = retval >> 12; |
329 | return retval; | |
330 | } | |
331 | ||
332 | static inline unsigned vbatt_adjust(struct ads7846 *ts, ssize_t v) | |
333 | { | |
334 | unsigned retval = vaux_adjust(ts, v); | |
335 | ||
336 | /* ads7846 has a resistor ladder to scale this signal down */ | |
337 | if (ts->model == 7846) | |
338 | retval *= 4; | |
339 | return retval; | |
340 | } | |
341 | ||
342 | SHOW(in0_input, vaux, vaux_adjust) | |
343 | SHOW(in1_input, vbatt, vbatt_adjust) | |
344 | ||
345 | ||
346 | static struct attribute *ads7846_attributes[] = { | |
347 | &dev_attr_temp0.attr, | |
348 | &dev_attr_temp1.attr, | |
349 | &dev_attr_in0_input.attr, | |
350 | &dev_attr_in1_input.attr, | |
351 | NULL, | |
352 | }; | |
353 | ||
354 | static struct attribute_group ads7846_attr_group = { | |
355 | .attrs = ads7846_attributes, | |
356 | }; | |
357 | ||
358 | static struct attribute *ads7843_attributes[] = { | |
359 | &dev_attr_in0_input.attr, | |
360 | &dev_attr_in1_input.attr, | |
361 | NULL, | |
362 | }; | |
363 | ||
364 | static struct attribute_group ads7843_attr_group = { | |
365 | .attrs = ads7843_attributes, | |
366 | }; | |
367 | ||
368 | static struct attribute *ads7845_attributes[] = { | |
369 | &dev_attr_in0_input.attr, | |
370 | NULL, | |
371 | }; | |
372 | ||
373 | static struct attribute_group ads7845_attr_group = { | |
374 | .attrs = ads7845_attributes, | |
375 | }; | |
376 | ||
377 | static int ads784x_hwmon_register(struct spi_device *spi, struct ads7846 *ts) | |
378 | { | |
1beeffe4 | 379 | struct device *hwmon; |
2c8dc071 DB |
380 | int err; |
381 | ||
382 | /* hwmon sensors need a reference voltage */ | |
383 | switch (ts->model) { | |
384 | case 7846: | |
7c6d0ee1 | 385 | if (!ts->vref_mv) { |
2c8dc071 | 386 | dev_dbg(&spi->dev, "assuming 2.5V internal vREF\n"); |
7c6d0ee1 | 387 | ts->vref_mv = 2500; |
2c8dc071 DB |
388 | } |
389 | break; | |
390 | case 7845: | |
391 | case 7843: | |
7c6d0ee1 | 392 | if (!ts->vref_mv) { |
2c8dc071 DB |
393 | dev_warn(&spi->dev, |
394 | "external vREF for ADS%d not specified\n", | |
395 | ts->model); | |
396 | return 0; | |
397 | } | |
398 | break; | |
399 | } | |
400 | ||
401 | /* different chips have different sensor groups */ | |
402 | switch (ts->model) { | |
403 | case 7846: | |
404 | ts->attr_group = &ads7846_attr_group; | |
405 | break; | |
406 | case 7845: | |
407 | ts->attr_group = &ads7845_attr_group; | |
408 | break; | |
409 | case 7843: | |
410 | ts->attr_group = &ads7843_attr_group; | |
411 | break; | |
412 | default: | |
413 | dev_dbg(&spi->dev, "ADS%d not recognized\n", ts->model); | |
414 | return 0; | |
415 | } | |
416 | ||
417 | err = sysfs_create_group(&spi->dev.kobj, ts->attr_group); | |
418 | if (err) | |
419 | return err; | |
420 | ||
421 | hwmon = hwmon_device_register(&spi->dev); | |
422 | if (IS_ERR(hwmon)) { | |
423 | sysfs_remove_group(&spi->dev.kobj, ts->attr_group); | |
424 | return PTR_ERR(hwmon); | |
425 | } | |
426 | ||
427 | ts->hwmon = hwmon; | |
428 | return 0; | |
429 | } | |
430 | ||
431 | static void ads784x_hwmon_unregister(struct spi_device *spi, | |
432 | struct ads7846 *ts) | |
433 | { | |
434 | if (ts->hwmon) { | |
435 | sysfs_remove_group(&spi->dev.kobj, ts->attr_group); | |
436 | hwmon_device_unregister(ts->hwmon); | |
437 | } | |
438 | } | |
439 | ||
440 | #else | |
441 | static inline int ads784x_hwmon_register(struct spi_device *spi, | |
442 | struct ads7846 *ts) | |
443 | { | |
444 | return 0; | |
445 | } | |
446 | ||
447 | static inline void ads784x_hwmon_unregister(struct spi_device *spi, | |
448 | struct ads7846 *ts) | |
449 | { | |
450 | } | |
451 | #endif | |
ffa458c1 | 452 | |
438f2a74 ID |
453 | static int is_pen_down(struct device *dev) |
454 | { | |
2c8dc071 | 455 | struct ads7846 *ts = dev_get_drvdata(dev); |
438f2a74 ID |
456 | |
457 | return ts->pendown; | |
458 | } | |
459 | ||
460 | static ssize_t ads7846_pen_down_show(struct device *dev, | |
461 | struct device_attribute *attr, char *buf) | |
462 | { | |
463 | return sprintf(buf, "%u\n", is_pen_down(dev)); | |
464 | } | |
465 | ||
466 | static DEVICE_ATTR(pen_down, S_IRUGO, ads7846_pen_down_show, NULL); | |
467 | ||
7de90a8c ID |
468 | static ssize_t ads7846_disable_show(struct device *dev, |
469 | struct device_attribute *attr, char *buf) | |
470 | { | |
471 | struct ads7846 *ts = dev_get_drvdata(dev); | |
472 | ||
473 | return sprintf(buf, "%u\n", ts->disabled); | |
474 | } | |
475 | ||
476 | static ssize_t ads7846_disable_store(struct device *dev, | |
477 | struct device_attribute *attr, | |
478 | const char *buf, size_t count) | |
479 | { | |
480 | struct ads7846 *ts = dev_get_drvdata(dev); | |
3a0c58dd | 481 | unsigned long i; |
160f1fef JR |
482 | |
483 | if (strict_strtoul(buf, 10, &i)) | |
484 | return -EINVAL; | |
7de90a8c | 485 | |
7de90a8c ID |
486 | spin_lock_irq(&ts->lock); |
487 | ||
488 | if (i) | |
489 | ads7846_disable(ts); | |
490 | else | |
491 | ads7846_enable(ts); | |
492 | ||
493 | spin_unlock_irq(&ts->lock); | |
494 | ||
495 | return count; | |
496 | } | |
497 | ||
498 | static DEVICE_ATTR(disable, 0664, ads7846_disable_show, ads7846_disable_store); | |
499 | ||
2c8dc071 | 500 | static struct attribute *ads784x_attributes[] = { |
8dd51650 DT |
501 | &dev_attr_pen_down.attr, |
502 | &dev_attr_disable.attr, | |
503 | NULL, | |
504 | }; | |
505 | ||
2c8dc071 DB |
506 | static struct attribute_group ads784x_attr_group = { |
507 | .attrs = ads784x_attributes, | |
8dd51650 DT |
508 | }; |
509 | ||
ffa458c1 DB |
510 | /*--------------------------------------------------------------------------*/ |
511 | ||
4d5975e5 EM |
512 | static int get_pendown_state(struct ads7846 *ts) |
513 | { | |
514 | if (ts->get_pendown_state) | |
515 | return ts->get_pendown_state(); | |
516 | ||
517 | return !gpio_get_value(ts->gpio_pendown); | |
518 | } | |
519 | ||
fd746d54 EM |
520 | static void null_wait_for_sync(void) |
521 | { | |
522 | } | |
523 | ||
ffa458c1 DB |
524 | /* |
525 | * PENIRQ only kicks the timer. The timer only reissues the SPI transfer, | |
526 | * to retrieve touchscreen status. | |
527 | * | |
528 | * The SPI transfer completion callback does the real work. It reports | |
529 | * touchscreen events and reactivates the timer (or IRQ) as appropriate. | |
530 | */ | |
531 | ||
532 | static void ads7846_rx(void *ads) | |
533 | { | |
a90f7e98 | 534 | struct ads7846 *ts = ads; |
e8f462d2 | 535 | struct ads7846_packet *packet = ts->packet; |
a90f7e98 | 536 | unsigned Rt; |
a90f7e98 | 537 | u16 x, y, z1, z2; |
ffa458c1 | 538 | |
da970e69 ID |
539 | /* ads7846_rx_val() did in-place conversion (including byteswap) from |
540 | * on-the-wire format as part of debouncing to get stable readings. | |
ffa458c1 | 541 | */ |
e8f462d2 DT |
542 | x = packet->tc.x; |
543 | y = packet->tc.y; | |
544 | z1 = packet->tc.z1; | |
545 | z2 = packet->tc.z2; | |
ffa458c1 DB |
546 | |
547 | /* range filtering */ | |
548 | if (x == MAX_12BIT) | |
549 | x = 0; | |
550 | ||
9460b652 HCE |
551 | if (ts->model == 7843) { |
552 | Rt = ts->pressure_max / 2; | |
553 | } else if (likely(x && z1)) { | |
ffa458c1 DB |
554 | /* compute touch pressure resistance using equation #2 */ |
555 | Rt = z2; | |
556 | Rt -= z1; | |
557 | Rt *= x; | |
558 | Rt *= ts->x_plate_ohms; | |
559 | Rt /= z1; | |
560 | Rt = (Rt + 2047) >> 12; | |
9460b652 | 561 | } else { |
ffa458c1 | 562 | Rt = 0; |
9460b652 | 563 | } |
969111e9 | 564 | |
d5b415c9 | 565 | /* Sample found inconsistent by debouncing or pressure is beyond |
1936d590 ID |
566 | * the maximum. Don't report it to user space, repeat at least |
567 | * once more the measurement | |
568 | */ | |
e8f462d2 | 569 | if (packet->tc.ignore || Rt > ts->pressure_max) { |
52ce4eaa PM |
570 | dev_vdbg(&ts->spi->dev, "ignored %d pressure %d\n", |
571 | packet->tc.ignore, Rt); | |
1936d590 | 572 | hrtimer_start(&ts->timer, ktime_set(0, TS_POLL_PERIOD), |
c9cb2e3d | 573 | HRTIMER_MODE_REL); |
d5b415c9 ID |
574 | return; |
575 | } | |
576 | ||
1d25891f SH |
577 | /* Maybe check the pendown state before reporting. This discards |
578 | * false readings when the pen is lifted. | |
579 | */ | |
580 | if (ts->penirq_recheck_delay_usecs) { | |
581 | udelay(ts->penirq_recheck_delay_usecs); | |
4d5975e5 | 582 | if (!get_pendown_state(ts)) |
1d25891f SH |
583 | Rt = 0; |
584 | } | |
585 | ||
15e3589e ID |
586 | /* NOTE: We can't rely on the pressure to determine the pen down |
587 | * state, even this controller has a pressure sensor. The pressure | |
588 | * value can fluctuate for quite a while after lifting the pen and | |
589 | * in some cases may not even settle at the expected value. | |
ffa458c1 | 590 | * |
15e3589e ID |
591 | * The only safe way to check for the pen up condition is in the |
592 | * timer by reading the pen signal state (it's a GPIO _and_ IRQ). | |
ffa458c1 | 593 | */ |
ffa458c1 | 594 | if (Rt) { |
15e3589e | 595 | struct input_dev *input = ts->input; |
ae82d5ab | 596 | |
15e3589e ID |
597 | if (!ts->pendown) { |
598 | input_report_key(input, BTN_TOUCH, 1); | |
599 | ts->pendown = 1; | |
52ce4eaa | 600 | dev_vdbg(&ts->spi->dev, "DOWN\n"); |
15e3589e | 601 | } |
86579a4c MR |
602 | |
603 | if (ts->swap_xy) | |
604 | swap(x, y); | |
605 | ||
15e3589e ID |
606 | input_report_abs(input, ABS_X, x); |
607 | input_report_abs(input, ABS_Y, y); | |
30ad7ba0 | 608 | input_report_abs(input, ABS_PRESSURE, ts->pressure_max - Rt); |
ffa458c1 | 609 | |
15e3589e | 610 | input_sync(input); |
52ce4eaa | 611 | dev_vdbg(&ts->spi->dev, "%4d/%4d/%4d\n", x, y, Rt); |
15e3589e | 612 | } |
ffa458c1 | 613 | |
c9cb2e3d TG |
614 | hrtimer_start(&ts->timer, ktime_set(0, TS_POLL_PERIOD), |
615 | HRTIMER_MODE_REL); | |
ffa458c1 DB |
616 | } |
617 | ||
da970e69 | 618 | static int ads7846_debounce(void *ads, int data_idx, int *val) |
0b7018aa ID |
619 | { |
620 | struct ads7846 *ts = ads; | |
0b7018aa | 621 | |
da970e69 ID |
622 | if (!ts->read_cnt || (abs(ts->last_read - *val) > ts->debounce_tol)) { |
623 | /* Start over collecting consistent readings. */ | |
624 | ts->read_rep = 0; | |
d5b415c9 ID |
625 | /* Repeat it, if this was the first read or the read |
626 | * wasn't consistent enough. */ | |
627 | if (ts->read_cnt < ts->debounce_max) { | |
da970e69 | 628 | ts->last_read = *val; |
d5b415c9 | 629 | ts->read_cnt++; |
da970e69 | 630 | return ADS7846_FILTER_REPEAT; |
d5b415c9 ID |
631 | } else { |
632 | /* Maximum number of debouncing reached and still | |
633 | * not enough number of consistent readings. Abort | |
634 | * the whole sample, repeat it in the next sampling | |
635 | * period. | |
636 | */ | |
d5b415c9 | 637 | ts->read_cnt = 0; |
da970e69 | 638 | return ADS7846_FILTER_IGNORE; |
d5b415c9 | 639 | } |
0b7018aa | 640 | } else { |
d5b415c9 ID |
641 | if (++ts->read_rep > ts->debounce_rep) { |
642 | /* Got a good reading for this coordinate, | |
643 | * go for the next one. */ | |
d5b415c9 ID |
644 | ts->read_cnt = 0; |
645 | ts->read_rep = 0; | |
da970e69 ID |
646 | return ADS7846_FILTER_OK; |
647 | } else { | |
d5b415c9 ID |
648 | /* Read more values that are consistent. */ |
649 | ts->read_cnt++; | |
da970e69 ID |
650 | return ADS7846_FILTER_REPEAT; |
651 | } | |
652 | } | |
653 | } | |
654 | ||
655 | static int ads7846_no_filter(void *ads, int data_idx, int *val) | |
656 | { | |
657 | return ADS7846_FILTER_OK; | |
658 | } | |
659 | ||
660 | static void ads7846_rx_val(void *ads) | |
661 | { | |
662 | struct ads7846 *ts = ads; | |
e8f462d2 | 663 | struct ads7846_packet *packet = ts->packet; |
da970e69 ID |
664 | struct spi_message *m; |
665 | struct spi_transfer *t; | |
da970e69 ID |
666 | int val; |
667 | int action; | |
668 | int status; | |
669 | ||
670 | m = &ts->msg[ts->msg_idx]; | |
671 | t = list_entry(m->transfers.prev, struct spi_transfer, transfer_list); | |
da970e69 ID |
672 | |
673 | /* adjust: on-wire is a must-ignore bit, a BE12 value, then padding; | |
674 | * built from two 8 bit values written msb-first. | |
675 | */ | |
494f6857 | 676 | val = be16_to_cpup((__be16 *)t->rx_buf) >> 3; |
da970e69 ID |
677 | |
678 | action = ts->filter(ts->filter_data, ts->msg_idx, &val); | |
679 | switch (action) { | |
680 | case ADS7846_FILTER_REPEAT: | |
681 | break; | |
682 | case ADS7846_FILTER_IGNORE: | |
e8f462d2 | 683 | packet->tc.ignore = 1; |
da970e69 ID |
684 | /* Last message will contain ads7846_rx() as the |
685 | * completion function. | |
686 | */ | |
687 | m = ts->last_msg; | |
688 | break; | |
689 | case ADS7846_FILTER_OK: | |
494f6857 | 690 | *(u16 *)t->rx_buf = val; |
e8f462d2 | 691 | packet->tc.ignore = 0; |
da970e69 ID |
692 | m = &ts->msg[++ts->msg_idx]; |
693 | break; | |
694 | default: | |
695 | BUG(); | |
0b7018aa | 696 | } |
fd746d54 | 697 | ts->wait_for_sync(); |
0b7018aa ID |
698 | status = spi_async(ts->spi, m); |
699 | if (status) | |
700 | dev_err(&ts->spi->dev, "spi_async --> %d\n", | |
701 | status); | |
702 | } | |
703 | ||
c9cb2e3d | 704 | static enum hrtimer_restart ads7846_timer(struct hrtimer *handle) |
ffa458c1 | 705 | { |
1936d590 | 706 | struct ads7846 *ts = container_of(handle, struct ads7846, timer); |
ffa458c1 | 707 | int status = 0; |
0b7018aa | 708 | |
ca109491 | 709 | spin_lock(&ts->lock); |
c9e617a5 | 710 | |
4d5975e5 | 711 | if (unlikely(!get_pendown_state(ts) || |
15e3589e ID |
712 | device_suspended(&ts->spi->dev))) { |
713 | if (ts->pendown) { | |
714 | struct input_dev *input = ts->input; | |
715 | ||
716 | input_report_key(input, BTN_TOUCH, 0); | |
717 | input_report_abs(input, ABS_PRESSURE, 0); | |
718 | input_sync(input); | |
719 | ||
720 | ts->pendown = 0; | |
52ce4eaa | 721 | dev_vdbg(&ts->spi->dev, "UP\n"); |
15e3589e ID |
722 | } |
723 | ||
9084533e | 724 | /* measurement cycle ended */ |
c9e617a5 ID |
725 | if (!device_suspended(&ts->spi->dev)) { |
726 | ts->irq_disabled = 0; | |
727 | enable_irq(ts->spi->irq); | |
728 | } | |
729 | ts->pending = 0; | |
c9e617a5 ID |
730 | } else { |
731 | /* pen is still down, continue with the measurement */ | |
732 | ts->msg_idx = 0; | |
fd746d54 | 733 | ts->wait_for_sync(); |
c9e617a5 ID |
734 | status = spi_async(ts->spi, &ts->msg[0]); |
735 | if (status) | |
736 | dev_err(&ts->spi->dev, "spi_async --> %d\n", status); | |
737 | } | |
738 | ||
ca109491 | 739 | spin_unlock(&ts->lock); |
1936d590 | 740 | return HRTIMER_NORESTART; |
0b7018aa ID |
741 | } |
742 | ||
7d12e780 | 743 | static irqreturn_t ads7846_irq(int irq, void *handle) |
0b7018aa ID |
744 | { |
745 | struct ads7846 *ts = handle; | |
746 | unsigned long flags; | |
ffa458c1 DB |
747 | |
748 | spin_lock_irqsave(&ts->lock, flags); | |
4d5975e5 | 749 | if (likely(get_pendown_state(ts))) { |
ffa458c1 | 750 | if (!ts->irq_disabled) { |
9084533e DB |
751 | /* The ARM do_simple_IRQ() dispatcher doesn't act |
752 | * like the other dispatchers: it will report IRQs | |
753 | * even after they've been disabled. We work around | |
754 | * that here. (The "generic irq" framework may help...) | |
0b7018aa | 755 | */ |
ffa458c1 | 756 | ts->irq_disabled = 1; |
3f3e7c6e | 757 | disable_irq_nosync(ts->spi->irq); |
0b7018aa | 758 | ts->pending = 1; |
1936d590 | 759 | hrtimer_start(&ts->timer, ktime_set(0, TS_POLL_DELAY), |
c9cb2e3d | 760 | HRTIMER_MODE_REL); |
0b7018aa | 761 | } |
ffa458c1 DB |
762 | } |
763 | spin_unlock_irqrestore(&ts->lock, flags); | |
7de90a8c ID |
764 | |
765 | return IRQ_HANDLED; | |
ffa458c1 DB |
766 | } |
767 | ||
768 | /*--------------------------------------------------------------------------*/ | |
769 | ||
7de90a8c ID |
770 | /* Must be called with ts->lock held */ |
771 | static void ads7846_disable(struct ads7846 *ts) | |
ffa458c1 | 772 | { |
7de90a8c ID |
773 | if (ts->disabled) |
774 | return; | |
ffa458c1 | 775 | |
c9e617a5 ID |
776 | ts->disabled = 1; |
777 | ||
ffa458c1 | 778 | /* are we waiting for IRQ, or polling? */ |
c9e617a5 ID |
779 | if (!ts->pending) { |
780 | ts->irq_disabled = 1; | |
781 | disable_irq(ts->spi->irq); | |
ffa458c1 | 782 | } else { |
c9e617a5 ID |
783 | /* the timer will run at least once more, and |
784 | * leave everything in a clean state, IRQ disabled | |
ffa458c1 | 785 | */ |
c9e617a5 | 786 | while (ts->pending) { |
7de90a8c | 787 | spin_unlock_irq(&ts->lock); |
c4febb94 | 788 | msleep(1); |
7de90a8c | 789 | spin_lock_irq(&ts->lock); |
ffa458c1 DB |
790 | } |
791 | } | |
792 | ||
91143379 GI |
793 | regulator_disable(ts->reg); |
794 | ||
ffa458c1 DB |
795 | /* we know the chip's in lowpower mode since we always |
796 | * leave it that way after every request | |
797 | */ | |
7de90a8c ID |
798 | } |
799 | ||
800 | /* Must be called with ts->lock held */ | |
801 | static void ads7846_enable(struct ads7846 *ts) | |
802 | { | |
803 | if (!ts->disabled) | |
804 | return; | |
805 | ||
91143379 GI |
806 | regulator_enable(ts->reg); |
807 | ||
7de90a8c ID |
808 | ts->disabled = 0; |
809 | ts->irq_disabled = 0; | |
810 | enable_irq(ts->spi->irq); | |
811 | } | |
812 | ||
813 | static int ads7846_suspend(struct spi_device *spi, pm_message_t message) | |
814 | { | |
815 | struct ads7846 *ts = dev_get_drvdata(&spi->dev); | |
816 | ||
817 | spin_lock_irq(&ts->lock); | |
818 | ||
fbb38e30 | 819 | ts->is_suspended = 1; |
7de90a8c ID |
820 | ads7846_disable(ts); |
821 | ||
822 | spin_unlock_irq(&ts->lock); | |
823 | ||
ffa458c1 | 824 | return 0; |
7de90a8c | 825 | |
ffa458c1 DB |
826 | } |
827 | ||
2e5a7bd9 | 828 | static int ads7846_resume(struct spi_device *spi) |
ffa458c1 | 829 | { |
2e5a7bd9 | 830 | struct ads7846 *ts = dev_get_drvdata(&spi->dev); |
ffa458c1 | 831 | |
7de90a8c ID |
832 | spin_lock_irq(&ts->lock); |
833 | ||
fbb38e30 | 834 | ts->is_suspended = 0; |
7de90a8c ID |
835 | ads7846_enable(ts); |
836 | ||
837 | spin_unlock_irq(&ts->lock); | |
838 | ||
ffa458c1 DB |
839 | return 0; |
840 | } | |
841 | ||
4d5975e5 EM |
842 | static int __devinit setup_pendown(struct spi_device *spi, struct ads7846 *ts) |
843 | { | |
844 | struct ads7846_platform_data *pdata = spi->dev.platform_data; | |
845 | int err; | |
846 | ||
847 | /* REVISIT when the irq can be triggered active-low, or if for some | |
848 | * reason the touchscreen isn't hooked up, we don't need to access | |
849 | * the pendown state. | |
850 | */ | |
851 | if (!pdata->get_pendown_state && !gpio_is_valid(pdata->gpio_pendown)) { | |
852 | dev_err(&spi->dev, "no get_pendown_state nor gpio_pendown?\n"); | |
853 | return -EINVAL; | |
854 | } | |
855 | ||
856 | if (pdata->get_pendown_state) { | |
857 | ts->get_pendown_state = pdata->get_pendown_state; | |
858 | return 0; | |
859 | } | |
860 | ||
861 | err = gpio_request(pdata->gpio_pendown, "ads7846_pendown"); | |
862 | if (err) { | |
863 | dev_err(&spi->dev, "failed to request pendown GPIO%d\n", | |
864 | pdata->gpio_pendown); | |
865 | return err; | |
866 | } | |
867 | ||
868 | ts->gpio_pendown = pdata->gpio_pendown; | |
869 | return 0; | |
870 | } | |
871 | ||
2e5a7bd9 | 872 | static int __devinit ads7846_probe(struct spi_device *spi) |
ffa458c1 | 873 | { |
ffa458c1 | 874 | struct ads7846 *ts; |
e8f462d2 | 875 | struct ads7846_packet *packet; |
a90f7e98 | 876 | struct input_dev *input_dev; |
2e5a7bd9 | 877 | struct ads7846_platform_data *pdata = spi->dev.platform_data; |
0b7018aa | 878 | struct spi_message *m; |
ffa458c1 | 879 | struct spi_transfer *x; |
de2defd9 | 880 | int vref; |
a90f7e98 | 881 | int err; |
ffa458c1 DB |
882 | |
883 | if (!spi->irq) { | |
2e5a7bd9 | 884 | dev_dbg(&spi->dev, "no IRQ?\n"); |
ffa458c1 DB |
885 | return -ENODEV; |
886 | } | |
887 | ||
888 | if (!pdata) { | |
2e5a7bd9 | 889 | dev_dbg(&spi->dev, "no platform data?\n"); |
ffa458c1 DB |
890 | return -ENODEV; |
891 | } | |
892 | ||
893 | /* don't exceed max specified sample rate */ | |
d93f70b2 | 894 | if (spi->max_speed_hz > (125000 * SAMPLE_BITS)) { |
2e5a7bd9 | 895 | dev_dbg(&spi->dev, "f(sample) %d KHz?\n", |
d93f70b2 | 896 | (spi->max_speed_hz/SAMPLE_BITS)/1000); |
ffa458c1 DB |
897 | return -EINVAL; |
898 | } | |
899 | ||
9084533e DB |
900 | /* We'd set TX wordsize 8 bits and RX wordsize to 13 bits ... except |
901 | * that even if the hardware can do that, the SPI controller driver | |
902 | * may not. So we stick to very-portable 8 bit words, both RX and TX. | |
ffa458c1 | 903 | */ |
9084533e | 904 | spi->bits_per_word = 8; |
230ffc8e | 905 | spi->mode = SPI_MODE_0; |
7937e86a ID |
906 | err = spi_setup(spi); |
907 | if (err < 0) | |
908 | return err; | |
ffa458c1 | 909 | |
a90f7e98 | 910 | ts = kzalloc(sizeof(struct ads7846), GFP_KERNEL); |
e8f462d2 | 911 | packet = kzalloc(sizeof(struct ads7846_packet), GFP_KERNEL); |
a90f7e98 | 912 | input_dev = input_allocate_device(); |
e8f462d2 | 913 | if (!ts || !packet || !input_dev) { |
a90f7e98 DT |
914 | err = -ENOMEM; |
915 | goto err_free_mem; | |
916 | } | |
ffa458c1 | 917 | |
2e5a7bd9 | 918 | dev_set_drvdata(&spi->dev, ts); |
ffa458c1 | 919 | |
e8f462d2 | 920 | ts->packet = packet; |
ffa458c1 | 921 | ts->spi = spi; |
a90f7e98 | 922 | ts->input = input_dev; |
7c6d0ee1 | 923 | ts->vref_mv = pdata->vref_mv; |
86579a4c | 924 | ts->swap_xy = pdata->swap_xy; |
ffa458c1 | 925 | |
c9cb2e3d | 926 | hrtimer_init(&ts->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); |
ffa458c1 DB |
927 | ts->timer.function = ads7846_timer; |
928 | ||
7de90a8c ID |
929 | spin_lock_init(&ts->lock); |
930 | ||
ffa458c1 DB |
931 | ts->model = pdata->model ? : 7846; |
932 | ts->vref_delay_usecs = pdata->vref_delay_usecs ? : 100; | |
933 | ts->x_plate_ohms = pdata->x_plate_ohms ? : 400; | |
d5b415c9 | 934 | ts->pressure_max = pdata->pressure_max ? : ~0; |
da970e69 ID |
935 | |
936 | if (pdata->filter != NULL) { | |
937 | if (pdata->filter_init != NULL) { | |
938 | err = pdata->filter_init(pdata, &ts->filter_data); | |
939 | if (err < 0) | |
940 | goto err_free_mem; | |
941 | } | |
942 | ts->filter = pdata->filter; | |
943 | ts->filter_cleanup = pdata->filter_cleanup; | |
944 | } else if (pdata->debounce_max) { | |
d5b415c9 | 945 | ts->debounce_max = pdata->debounce_max; |
da970e69 ID |
946 | if (ts->debounce_max < 2) |
947 | ts->debounce_max = 2; | |
d5b415c9 ID |
948 | ts->debounce_tol = pdata->debounce_tol; |
949 | ts->debounce_rep = pdata->debounce_rep; | |
da970e69 ID |
950 | ts->filter = ads7846_debounce; |
951 | ts->filter_data = ts; | |
d5b415c9 | 952 | } else |
da970e69 | 953 | ts->filter = ads7846_no_filter; |
4d5975e5 EM |
954 | |
955 | err = setup_pendown(spi, ts); | |
956 | if (err) | |
957 | goto err_cleanup_filter; | |
ffa458c1 | 958 | |
1d25891f SH |
959 | if (pdata->penirq_recheck_delay_usecs) |
960 | ts->penirq_recheck_delay_usecs = | |
961 | pdata->penirq_recheck_delay_usecs; | |
962 | ||
fd746d54 EM |
963 | ts->wait_for_sync = pdata->wait_for_sync ? : null_wait_for_sync; |
964 | ||
a6c2490f | 965 | snprintf(ts->phys, sizeof(ts->phys), "%s/input0", dev_name(&spi->dev)); |
b58895f8 | 966 | snprintf(ts->name, sizeof(ts->name), "ADS%d Touchscreen", ts->model); |
ffa458c1 | 967 | |
b58895f8 | 968 | input_dev->name = ts->name; |
a90f7e98 | 969 | input_dev->phys = ts->phys; |
a5394fb0 | 970 | input_dev->dev.parent = &spi->dev; |
ffa458c1 | 971 | |
7b19ada2 JS |
972 | input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS); |
973 | input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH); | |
a90f7e98 | 974 | input_set_abs_params(input_dev, ABS_X, |
ffa458c1 DB |
975 | pdata->x_min ? : 0, |
976 | pdata->x_max ? : MAX_12BIT, | |
977 | 0, 0); | |
a90f7e98 | 978 | input_set_abs_params(input_dev, ABS_Y, |
ffa458c1 DB |
979 | pdata->y_min ? : 0, |
980 | pdata->y_max ? : MAX_12BIT, | |
981 | 0, 0); | |
a90f7e98 | 982 | input_set_abs_params(input_dev, ABS_PRESSURE, |
ffa458c1 DB |
983 | pdata->pressure_min, pdata->pressure_max, 0, 0); |
984 | ||
de2defd9 ID |
985 | vref = pdata->keep_vref_on; |
986 | ||
ffa458c1 DB |
987 | /* set up the transfers to read touchscreen state; this assumes we |
988 | * use formula #2 for pressure, not #3. | |
989 | */ | |
0b7018aa | 990 | m = &ts->msg[0]; |
ffa458c1 DB |
991 | x = ts->xfer; |
992 | ||
0b7018aa ID |
993 | spi_message_init(m); |
994 | ||
ffa458c1 | 995 | /* y- still on; turn on only y+ (and ADC) */ |
e8f462d2 DT |
996 | packet->read_y = READ_Y(vref); |
997 | x->tx_buf = &packet->read_y; | |
ffa458c1 | 998 | x->len = 1; |
0b7018aa | 999 | spi_message_add_tail(x, m); |
d93f70b2 | 1000 | |
ffa458c1 | 1001 | x++; |
e8f462d2 | 1002 | x->rx_buf = &packet->tc.y; |
ffa458c1 | 1003 | x->len = 2; |
0b7018aa ID |
1004 | spi_message_add_tail(x, m); |
1005 | ||
e4f48861 SH |
1006 | /* the first sample after switching drivers can be low quality; |
1007 | * optionally discard it, using a second one after the signals | |
1008 | * have had enough time to stabilize. | |
1009 | */ | |
1010 | if (pdata->settle_delay_usecs) { | |
1011 | x->delay_usecs = pdata->settle_delay_usecs; | |
1012 | ||
1013 | x++; | |
e8f462d2 | 1014 | x->tx_buf = &packet->read_y; |
e4f48861 SH |
1015 | x->len = 1; |
1016 | spi_message_add_tail(x, m); | |
1017 | ||
1018 | x++; | |
e8f462d2 | 1019 | x->rx_buf = &packet->tc.y; |
e4f48861 SH |
1020 | x->len = 2; |
1021 | spi_message_add_tail(x, m); | |
1022 | } | |
1023 | ||
da970e69 | 1024 | m->complete = ads7846_rx_val; |
0b7018aa ID |
1025 | m->context = ts; |
1026 | ||
1027 | m++; | |
1028 | spi_message_init(m); | |
1029 | ||
1030 | /* turn y- off, x+ on, then leave in lowpower */ | |
1031 | x++; | |
e8f462d2 DT |
1032 | packet->read_x = READ_X(vref); |
1033 | x->tx_buf = &packet->read_x; | |
0b7018aa ID |
1034 | x->len = 1; |
1035 | spi_message_add_tail(x, m); | |
1036 | ||
1037 | x++; | |
e8f462d2 | 1038 | x->rx_buf = &packet->tc.x; |
0b7018aa ID |
1039 | x->len = 2; |
1040 | spi_message_add_tail(x, m); | |
1041 | ||
e4f48861 SH |
1042 | /* ... maybe discard first sample ... */ |
1043 | if (pdata->settle_delay_usecs) { | |
1044 | x->delay_usecs = pdata->settle_delay_usecs; | |
1045 | ||
1046 | x++; | |
e8f462d2 | 1047 | x->tx_buf = &packet->read_x; |
e4f48861 SH |
1048 | x->len = 1; |
1049 | spi_message_add_tail(x, m); | |
1050 | ||
1051 | x++; | |
e8f462d2 | 1052 | x->rx_buf = &packet->tc.x; |
e4f48861 SH |
1053 | x->len = 2; |
1054 | spi_message_add_tail(x, m); | |
1055 | } | |
1056 | ||
da970e69 | 1057 | m->complete = ads7846_rx_val; |
0b7018aa | 1058 | m->context = ts; |
ffa458c1 DB |
1059 | |
1060 | /* turn y+ off, x- on; we'll use formula #2 */ | |
1061 | if (ts->model == 7846) { | |
0b7018aa ID |
1062 | m++; |
1063 | spi_message_init(m); | |
1064 | ||
d93f70b2 | 1065 | x++; |
e8f462d2 DT |
1066 | packet->read_z1 = READ_Z1(vref); |
1067 | x->tx_buf = &packet->read_z1; | |
ffa458c1 | 1068 | x->len = 1; |
0b7018aa | 1069 | spi_message_add_tail(x, m); |
d93f70b2 | 1070 | |
ffa458c1 | 1071 | x++; |
e8f462d2 | 1072 | x->rx_buf = &packet->tc.z1; |
ffa458c1 | 1073 | x->len = 2; |
0b7018aa ID |
1074 | spi_message_add_tail(x, m); |
1075 | ||
e4f48861 SH |
1076 | /* ... maybe discard first sample ... */ |
1077 | if (pdata->settle_delay_usecs) { | |
1078 | x->delay_usecs = pdata->settle_delay_usecs; | |
1079 | ||
1080 | x++; | |
e8f462d2 | 1081 | x->tx_buf = &packet->read_z1; |
e4f48861 SH |
1082 | x->len = 1; |
1083 | spi_message_add_tail(x, m); | |
1084 | ||
1085 | x++; | |
e8f462d2 | 1086 | x->rx_buf = &packet->tc.z1; |
e4f48861 SH |
1087 | x->len = 2; |
1088 | spi_message_add_tail(x, m); | |
1089 | } | |
1090 | ||
da970e69 | 1091 | m->complete = ads7846_rx_val; |
0b7018aa ID |
1092 | m->context = ts; |
1093 | ||
1094 | m++; | |
1095 | spi_message_init(m); | |
ffa458c1 | 1096 | |
d93f70b2 | 1097 | x++; |
e8f462d2 DT |
1098 | packet->read_z2 = READ_Z2(vref); |
1099 | x->tx_buf = &packet->read_z2; | |
ffa458c1 | 1100 | x->len = 1; |
0b7018aa | 1101 | spi_message_add_tail(x, m); |
d93f70b2 | 1102 | |
ffa458c1 | 1103 | x++; |
e8f462d2 | 1104 | x->rx_buf = &packet->tc.z2; |
ffa458c1 | 1105 | x->len = 2; |
0b7018aa | 1106 | spi_message_add_tail(x, m); |
ffa458c1 | 1107 | |
e4f48861 SH |
1108 | /* ... maybe discard first sample ... */ |
1109 | if (pdata->settle_delay_usecs) { | |
1110 | x->delay_usecs = pdata->settle_delay_usecs; | |
1111 | ||
1112 | x++; | |
e8f462d2 | 1113 | x->tx_buf = &packet->read_z2; |
e4f48861 SH |
1114 | x->len = 1; |
1115 | spi_message_add_tail(x, m); | |
1116 | ||
1117 | x++; | |
e8f462d2 | 1118 | x->rx_buf = &packet->tc.z2; |
e4f48861 SH |
1119 | x->len = 2; |
1120 | spi_message_add_tail(x, m); | |
1121 | } | |
1122 | ||
da970e69 | 1123 | m->complete = ads7846_rx_val; |
0b7018aa ID |
1124 | m->context = ts; |
1125 | } | |
53a0ef89 ID |
1126 | |
1127 | /* power down */ | |
0b7018aa ID |
1128 | m++; |
1129 | spi_message_init(m); | |
1130 | ||
53a0ef89 | 1131 | x++; |
e8f462d2 DT |
1132 | packet->pwrdown = PWRDOWN; |
1133 | x->tx_buf = &packet->pwrdown; | |
53a0ef89 | 1134 | x->len = 1; |
0b7018aa | 1135 | spi_message_add_tail(x, m); |
53a0ef89 ID |
1136 | |
1137 | x++; | |
e8f462d2 | 1138 | x->rx_buf = &packet->dummy; |
53a0ef89 | 1139 | x->len = 2; |
d93f70b2 | 1140 | CS_CHANGE(*x); |
0b7018aa | 1141 | spi_message_add_tail(x, m); |
ffa458c1 | 1142 | |
0b7018aa ID |
1143 | m->complete = ads7846_rx; |
1144 | m->context = ts; | |
ffa458c1 | 1145 | |
d5b415c9 ID |
1146 | ts->last_msg = m; |
1147 | ||
91143379 GI |
1148 | ts->reg = regulator_get(&spi->dev, "vcc"); |
1149 | if (IS_ERR(ts->reg)) { | |
1150 | dev_err(&spi->dev, "unable to get regulator: %ld\n", | |
1151 | PTR_ERR(ts->reg)); | |
1152 | goto err_free_gpio; | |
1153 | } | |
1154 | ||
1155 | err = regulator_enable(ts->reg); | |
1156 | if (err) { | |
1157 | dev_err(&spi->dev, "unable to enable regulator: %d\n", err); | |
1158 | goto err_put_regulator; | |
1159 | } | |
1160 | ||
dace1453 | 1161 | if (request_irq(spi->irq, ads7846_irq, IRQF_TRIGGER_FALLING, |
9084533e | 1162 | spi->dev.driver->name, ts)) { |
c57c0a2a MR |
1163 | dev_info(&spi->dev, |
1164 | "trying pin change workaround on irq %d\n", spi->irq); | |
1165 | err = request_irq(spi->irq, ads7846_irq, | |
1166 | IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING, | |
1167 | spi->dev.driver->name, ts); | |
1168 | if (err) { | |
1169 | dev_dbg(&spi->dev, "irq %d busy?\n", spi->irq); | |
91143379 | 1170 | goto err_disable_regulator; |
c57c0a2a | 1171 | } |
ffa458c1 | 1172 | } |
ffa458c1 | 1173 | |
2c8dc071 DB |
1174 | err = ads784x_hwmon_register(spi, ts); |
1175 | if (err) | |
1176 | goto err_free_irq; | |
1177 | ||
2e5a7bd9 | 1178 | dev_info(&spi->dev, "touchscreen, irq %d\n", spi->irq); |
ffa458c1 | 1179 | |
2c8dc071 | 1180 | /* take a first sample, leaving nPENIRQ active and vREF off; avoid |
ffa458c1 DB |
1181 | * the touchscreen, in case it's not connected. |
1182 | */ | |
2e5a7bd9 | 1183 | (void) ads7846_read12_ser(&spi->dev, |
ffa458c1 DB |
1184 | READ_12BIT_SER(vaux) | ADS_PD10_ALL_ON); |
1185 | ||
2c8dc071 | 1186 | err = sysfs_create_group(&spi->dev.kobj, &ads784x_attr_group); |
8dd51650 | 1187 | if (err) |
2c8dc071 | 1188 | goto err_remove_hwmon; |
7de90a8c | 1189 | |
a90f7e98 DT |
1190 | err = input_register_device(input_dev); |
1191 | if (err) | |
8dd51650 | 1192 | goto err_remove_attr_group; |
a90f7e98 | 1193 | |
ffa458c1 | 1194 | return 0; |
a90f7e98 | 1195 | |
8dd51650 | 1196 | err_remove_attr_group: |
2c8dc071 DB |
1197 | sysfs_remove_group(&spi->dev.kobj, &ads784x_attr_group); |
1198 | err_remove_hwmon: | |
1199 | ads784x_hwmon_unregister(spi, ts); | |
8dd51650 | 1200 | err_free_irq: |
a90f7e98 | 1201 | free_irq(spi->irq, ts); |
91143379 GI |
1202 | err_disable_regulator: |
1203 | regulator_disable(ts->reg); | |
1204 | err_put_regulator: | |
1205 | regulator_put(ts->reg); | |
4d5975e5 EM |
1206 | err_free_gpio: |
1207 | if (ts->gpio_pendown != -1) | |
1208 | gpio_free(ts->gpio_pendown); | |
da970e69 ID |
1209 | err_cleanup_filter: |
1210 | if (ts->filter_cleanup) | |
1211 | ts->filter_cleanup(ts->filter_data); | |
a90f7e98 DT |
1212 | err_free_mem: |
1213 | input_free_device(input_dev); | |
e8f462d2 | 1214 | kfree(packet); |
a90f7e98 DT |
1215 | kfree(ts); |
1216 | return err; | |
ffa458c1 DB |
1217 | } |
1218 | ||
2e5a7bd9 | 1219 | static int __devexit ads7846_remove(struct spi_device *spi) |
ffa458c1 | 1220 | { |
2e5a7bd9 | 1221 | struct ads7846 *ts = dev_get_drvdata(&spi->dev); |
ffa458c1 | 1222 | |
2c8dc071 | 1223 | ads784x_hwmon_unregister(spi, ts); |
7de90a8c ID |
1224 | input_unregister_device(ts->input); |
1225 | ||
2e5a7bd9 | 1226 | ads7846_suspend(spi, PMSG_SUSPEND); |
ffa458c1 | 1227 | |
2c8dc071 | 1228 | sysfs_remove_group(&spi->dev.kobj, &ads784x_attr_group); |
ffa458c1 | 1229 | |
7de90a8c | 1230 | free_irq(ts->spi->irq, ts); |
c9e617a5 ID |
1231 | /* suspend left the IRQ disabled */ |
1232 | enable_irq(ts->spi->irq); | |
7de90a8c | 1233 | |
91143379 GI |
1234 | regulator_disable(ts->reg); |
1235 | regulator_put(ts->reg); | |
1236 | ||
4d5975e5 EM |
1237 | if (ts->gpio_pendown != -1) |
1238 | gpio_free(ts->gpio_pendown); | |
1239 | ||
da970e69 ID |
1240 | if (ts->filter_cleanup) |
1241 | ts->filter_cleanup(ts->filter_data); | |
1242 | ||
e8f462d2 | 1243 | kfree(ts->packet); |
ffa458c1 DB |
1244 | kfree(ts); |
1245 | ||
2e5a7bd9 | 1246 | dev_dbg(&spi->dev, "unregistered touchscreen\n"); |
ffa458c1 DB |
1247 | return 0; |
1248 | } | |
1249 | ||
2e5a7bd9 DB |
1250 | static struct spi_driver ads7846_driver = { |
1251 | .driver = { | |
1252 | .name = "ads7846", | |
1253 | .bus = &spi_bus_type, | |
1254 | .owner = THIS_MODULE, | |
1255 | }, | |
ffa458c1 | 1256 | .probe = ads7846_probe, |
2e5a7bd9 | 1257 | .remove = __devexit_p(ads7846_remove), |
ffa458c1 DB |
1258 | .suspend = ads7846_suspend, |
1259 | .resume = ads7846_resume, | |
1260 | }; | |
1261 | ||
1262 | static int __init ads7846_init(void) | |
1263 | { | |
2e5a7bd9 | 1264 | return spi_register_driver(&ads7846_driver); |
ffa458c1 DB |
1265 | } |
1266 | module_init(ads7846_init); | |
1267 | ||
1268 | static void __exit ads7846_exit(void) | |
1269 | { | |
2e5a7bd9 | 1270 | spi_unregister_driver(&ads7846_driver); |
ffa458c1 DB |
1271 | } |
1272 | module_exit(ads7846_exit); | |
1273 | ||
1274 | MODULE_DESCRIPTION("ADS7846 TouchScreen Driver"); | |
1275 | MODULE_LICENSE("GPL"); | |
e0626e38 | 1276 | MODULE_ALIAS("spi:ads7846"); |