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 | */ | |
2991a1ca | 20 | #include <linux/types.h> |
2c8dc071 | 21 | #include <linux/hwmon.h> |
ffa458c1 | 22 | #include <linux/init.h> |
2c8dc071 | 23 | #include <linux/err.h> |
2991a1ca | 24 | #include <linux/sched.h> |
ffa458c1 DB |
25 | #include <linux/delay.h> |
26 | #include <linux/input.h> | |
27 | #include <linux/interrupt.h> | |
28 | #include <linux/slab.h> | |
3c36e719 | 29 | #include <linux/pm.h> |
4d5975e5 | 30 | #include <linux/gpio.h> |
ffa458c1 DB |
31 | #include <linux/spi/spi.h> |
32 | #include <linux/spi/ads7846.h> | |
91143379 | 33 | #include <linux/regulator/consumer.h> |
3ac8bf07 | 34 | #include <asm/irq.h> |
ffa458c1 | 35 | |
ffa458c1 | 36 | /* |
9084533e | 37 | * This code has been heavily tested on a Nokia 770, and lightly |
52ce4eaa | 38 | * tested on other ads7846 devices (OSK/Mistral, Lubbock, Spitz). |
bff0de5f | 39 | * TSC2046 is just newer ads7846 silicon. |
969111e9 NF |
40 | * Support for ads7843 tested on Atmel at91sam926x-EK. |
41 | * Support for ads7845 has only been stubbed in. | |
06a09124 | 42 | * Support for Analog Devices AD7873 and AD7843 tested. |
ffa458c1 | 43 | * |
7de90a8c ID |
44 | * IRQ handling needs a workaround because of a shortcoming in handling |
45 | * edge triggered IRQs on some platforms like the OMAP1/2. These | |
46 | * platforms don't handle the ARM lazy IRQ disabling properly, thus we | |
47 | * have to maintain our own SW IRQ disabled status. This should be | |
48 | * removed as soon as the affected platform's IRQ handling is fixed. | |
49 | * | |
52ce4eaa | 50 | * App note sbaa036 talks in more detail about accurate sampling... |
ffa458c1 DB |
51 | * that ought to help in situations like LCDs inducing noise (which |
52 | * can also be helped by using synch signals) and more generally. | |
7de90a8c ID |
53 | * This driver tries to utilize the measures described in the app |
54 | * note. The strength of filtering can be set in the board-* specific | |
55 | * files. | |
ffa458c1 DB |
56 | */ |
57 | ||
2991a1ca JW |
58 | #define TS_POLL_DELAY 1 /* ms delay before the first sample */ |
59 | #define TS_POLL_PERIOD 5 /* ms delay between samples */ | |
ffa458c1 | 60 | |
d93f70b2 DB |
61 | /* this driver doesn't aim at the peak continuous sample rate */ |
62 | #define SAMPLE_BITS (8 /*cmd*/ + 16 /*sample*/ + 2 /* before, after */) | |
63 | ||
ffa458c1 | 64 | struct ts_event { |
2991a1ca JW |
65 | /* |
66 | * For portability, we can't read 12 bit values using SPI (which | |
67 | * would make the controller deliver them as native byte order u16 | |
d93f70b2 | 68 | * with msbs zeroed). Instead, we read them as two 8-bit values, |
da970e69 | 69 | * *** WHICH NEED BYTESWAPPING *** and range adjustment. |
ffa458c1 | 70 | */ |
da970e69 ID |
71 | u16 x; |
72 | u16 y; | |
73 | u16 z1, z2; | |
2991a1ca | 74 | bool ignore; |
3eac5c7e AG |
75 | u8 x_buf[3]; |
76 | u8 y_buf[3]; | |
ffa458c1 DB |
77 | }; |
78 | ||
e8f462d2 DT |
79 | /* |
80 | * We allocate this separately to avoid cache line sharing issues when | |
81 | * driver is used with DMA-based SPI controllers (like atmel_spi) on | |
82 | * systems where main memory is not DMA-coherent (most non-x86 boards). | |
83 | */ | |
84 | struct ads7846_packet { | |
85 | u8 read_x, read_y, read_z1, read_z2, pwrdown; | |
86 | u16 dummy; /* for the pwrdown read */ | |
87 | struct ts_event tc; | |
3eac5c7e AG |
88 | /* for ads7845 with mpc5121 psc spi we use 3-byte buffers */ |
89 | u8 read_x_cmd[3], read_y_cmd[3], pwrdown_cmd[3]; | |
e8f462d2 DT |
90 | }; |
91 | ||
ffa458c1 | 92 | struct ads7846 { |
a90f7e98 | 93 | struct input_dev *input; |
ffa458c1 | 94 | char phys[32]; |
b58895f8 | 95 | char name[32]; |
ffa458c1 DB |
96 | |
97 | struct spi_device *spi; | |
91143379 | 98 | struct regulator *reg; |
2c8dc071 DB |
99 | |
100 | #if defined(CONFIG_HWMON) || defined(CONFIG_HWMON_MODULE) | |
8dd51650 | 101 | struct attribute_group *attr_group; |
1beeffe4 | 102 | struct device *hwmon; |
2c8dc071 DB |
103 | #endif |
104 | ||
ffa458c1 | 105 | u16 model; |
7c6d0ee1 | 106 | u16 vref_mv; |
ffa458c1 DB |
107 | u16 vref_delay_usecs; |
108 | u16 x_plate_ohms; | |
d5b415c9 | 109 | u16 pressure_max; |
ffa458c1 | 110 | |
86579a4c | 111 | bool swap_xy; |
ebcaaad9 | 112 | bool use_internal; |
86579a4c | 113 | |
e8f462d2 | 114 | struct ads7846_packet *packet; |
ffa458c1 | 115 | |
e4f48861 | 116 | struct spi_transfer xfer[18]; |
0b7018aa | 117 | struct spi_message msg[5]; |
2991a1ca JW |
118 | int msg_count; |
119 | wait_queue_head_t wait; | |
120 | ||
121 | bool pendown; | |
122 | ||
0b7018aa | 123 | int read_cnt; |
d5b415c9 | 124 | int read_rep; |
0b7018aa ID |
125 | int last_read; |
126 | ||
127 | u16 debounce_max; | |
128 | u16 debounce_tol; | |
d5b415c9 | 129 | u16 debounce_rep; |
ffa458c1 | 130 | |
1d25891f SH |
131 | u16 penirq_recheck_delay_usecs; |
132 | ||
2991a1ca JW |
133 | struct mutex lock; |
134 | bool stopped; /* P: lock */ | |
135 | bool disabled; /* P: lock */ | |
136 | bool suspended; /* P: lock */ | |
c9e617a5 | 137 | |
da970e69 ID |
138 | int (*filter)(void *data, int data_idx, int *val); |
139 | void *filter_data; | |
140 | void (*filter_cleanup)(void *data); | |
c9e617a5 | 141 | int (*get_pendown_state)(void); |
4d5975e5 | 142 | int gpio_pendown; |
fd746d54 EM |
143 | |
144 | void (*wait_for_sync)(void); | |
ffa458c1 DB |
145 | }; |
146 | ||
147 | /* leave chip selected when we're done, for quicker re-select? */ | |
148 | #if 0 | |
149 | #define CS_CHANGE(xfer) ((xfer).cs_change = 1) | |
150 | #else | |
151 | #define CS_CHANGE(xfer) ((xfer).cs_change = 0) | |
152 | #endif | |
153 | ||
154 | /*--------------------------------------------------------------------------*/ | |
155 | ||
156 | /* The ADS7846 has touchscreen and other sensors. | |
157 | * Earlier ads784x chips are somewhat compatible. | |
158 | */ | |
159 | #define ADS_START (1 << 7) | |
160 | #define ADS_A2A1A0_d_y (1 << 4) /* differential */ | |
161 | #define ADS_A2A1A0_d_z1 (3 << 4) /* differential */ | |
162 | #define ADS_A2A1A0_d_z2 (4 << 4) /* differential */ | |
163 | #define ADS_A2A1A0_d_x (5 << 4) /* differential */ | |
164 | #define ADS_A2A1A0_temp0 (0 << 4) /* non-differential */ | |
165 | #define ADS_A2A1A0_vbatt (2 << 4) /* non-differential */ | |
166 | #define ADS_A2A1A0_vaux (6 << 4) /* non-differential */ | |
167 | #define ADS_A2A1A0_temp1 (7 << 4) /* non-differential */ | |
168 | #define ADS_8_BIT (1 << 3) | |
169 | #define ADS_12_BIT (0 << 3) | |
170 | #define ADS_SER (1 << 2) /* non-differential */ | |
171 | #define ADS_DFR (0 << 2) /* differential */ | |
2991a1ca | 172 | #define ADS_PD10_PDOWN (0 << 0) /* low power mode + penirq */ |
ffa458c1 DB |
173 | #define ADS_PD10_ADC_ON (1 << 0) /* ADC on */ |
174 | #define ADS_PD10_REF_ON (2 << 0) /* vREF on + penirq */ | |
175 | #define ADS_PD10_ALL_ON (3 << 0) /* ADC + vREF on */ | |
176 | ||
177 | #define MAX_12BIT ((1<<12)-1) | |
178 | ||
179 | /* leave ADC powered up (disables penirq) between differential samples */ | |
de2defd9 ID |
180 | #define READ_12BIT_DFR(x, adc, vref) (ADS_START | ADS_A2A1A0_d_ ## x \ |
181 | | ADS_12_BIT | ADS_DFR | \ | |
182 | (adc ? ADS_PD10_ADC_ON : 0) | (vref ? ADS_PD10_REF_ON : 0)) | |
ffa458c1 | 183 | |
de2defd9 ID |
184 | #define READ_Y(vref) (READ_12BIT_DFR(y, 1, vref)) |
185 | #define READ_Z1(vref) (READ_12BIT_DFR(z1, 1, vref)) | |
186 | #define READ_Z2(vref) (READ_12BIT_DFR(z2, 1, vref)) | |
53a0ef89 | 187 | |
de2defd9 ID |
188 | #define READ_X(vref) (READ_12BIT_DFR(x, 1, vref)) |
189 | #define PWRDOWN (READ_12BIT_DFR(y, 0, 0)) /* LAST */ | |
ffa458c1 DB |
190 | |
191 | /* single-ended samples need to first power up reference voltage; | |
192 | * we leave both ADC and VREF powered | |
193 | */ | |
194 | #define READ_12BIT_SER(x) (ADS_START | ADS_A2A1A0_ ## x \ | |
195 | | ADS_12_BIT | ADS_SER) | |
196 | ||
de2defd9 ID |
197 | #define REF_ON (READ_12BIT_DFR(x, 1, 1)) |
198 | #define REF_OFF (READ_12BIT_DFR(y, 0, 0)) | |
ffa458c1 | 199 | |
2991a1ca JW |
200 | /* Must be called with ts->lock held */ |
201 | static void ads7846_stop(struct ads7846 *ts) | |
202 | { | |
203 | if (!ts->disabled && !ts->suspended) { | |
204 | /* Signal IRQ thread to stop polling and disable the handler. */ | |
205 | ts->stopped = true; | |
206 | mb(); | |
207 | wake_up(&ts->wait); | |
208 | disable_irq(ts->spi->irq); | |
209 | } | |
210 | } | |
211 | ||
212 | /* Must be called with ts->lock held */ | |
213 | static void ads7846_restart(struct ads7846 *ts) | |
214 | { | |
215 | if (!ts->disabled && !ts->suspended) { | |
216 | /* Tell IRQ thread that it may poll the device. */ | |
217 | ts->stopped = false; | |
218 | mb(); | |
219 | enable_irq(ts->spi->irq); | |
220 | } | |
221 | } | |
222 | ||
223 | /* Must be called with ts->lock held */ | |
224 | static void __ads7846_disable(struct ads7846 *ts) | |
225 | { | |
226 | ads7846_stop(ts); | |
227 | regulator_disable(ts->reg); | |
228 | ||
229 | /* | |
230 | * We know the chip's in low power mode since we always | |
231 | * leave it that way after every request | |
232 | */ | |
233 | } | |
234 | ||
235 | /* Must be called with ts->lock held */ | |
236 | static void __ads7846_enable(struct ads7846 *ts) | |
237 | { | |
238 | regulator_enable(ts->reg); | |
239 | ads7846_restart(ts); | |
240 | } | |
241 | ||
242 | static void ads7846_disable(struct ads7846 *ts) | |
243 | { | |
244 | mutex_lock(&ts->lock); | |
245 | ||
246 | if (!ts->disabled) { | |
247 | ||
248 | if (!ts->suspended) | |
249 | __ads7846_disable(ts); | |
250 | ||
251 | ts->disabled = true; | |
252 | } | |
253 | ||
254 | mutex_unlock(&ts->lock); | |
255 | } | |
256 | ||
257 | static void ads7846_enable(struct ads7846 *ts) | |
258 | { | |
259 | mutex_lock(&ts->lock); | |
260 | ||
261 | if (ts->disabled) { | |
262 | ||
263 | ts->disabled = false; | |
264 | ||
265 | if (!ts->suspended) | |
266 | __ads7846_enable(ts); | |
267 | } | |
268 | ||
269 | mutex_unlock(&ts->lock); | |
270 | } | |
271 | ||
ffa458c1 DB |
272 | /*--------------------------------------------------------------------------*/ |
273 | ||
274 | /* | |
275 | * Non-touchscreen sensors only use single-ended conversions. | |
2c8dc071 DB |
276 | * The range is GND..vREF. The ads7843 and ads7835 must use external vREF; |
277 | * ads7846 lets that pin be unconnected, to use internal vREF. | |
ffa458c1 DB |
278 | */ |
279 | ||
280 | struct ser_req { | |
d93f70b2 | 281 | u8 ref_on; |
ffa458c1 | 282 | u8 command; |
d93f70b2 | 283 | u8 ref_off; |
ffa458c1 DB |
284 | u16 scratch; |
285 | __be16 sample; | |
286 | struct spi_message msg; | |
287 | struct spi_transfer xfer[6]; | |
288 | }; | |
289 | ||
3eac5c7e AG |
290 | struct ads7845_ser_req { |
291 | u8 command[3]; | |
292 | u8 pwrdown[3]; | |
293 | u8 sample[3]; | |
294 | struct spi_message msg; | |
295 | struct spi_transfer xfer[2]; | |
296 | }; | |
297 | ||
ffa458c1 DB |
298 | static int ads7846_read12_ser(struct device *dev, unsigned command) |
299 | { | |
2991a1ca JW |
300 | struct spi_device *spi = to_spi_device(dev); |
301 | struct ads7846 *ts = dev_get_drvdata(dev); | |
302 | struct ser_req *req; | |
303 | int status; | |
ffa458c1 | 304 | |
2991a1ca | 305 | req = kzalloc(sizeof *req, GFP_KERNEL); |
ffa458c1 DB |
306 | if (!req) |
307 | return -ENOMEM; | |
308 | ||
0b7018aa | 309 | spi_message_init(&req->msg); |
8275c642 | 310 | |
2c8dc071 | 311 | /* maybe turn on internal vREF, and let it settle */ |
ebcaaad9 | 312 | if (ts->use_internal) { |
2c8dc071 DB |
313 | req->ref_on = REF_ON; |
314 | req->xfer[0].tx_buf = &req->ref_on; | |
315 | req->xfer[0].len = 1; | |
316 | spi_message_add_tail(&req->xfer[0], &req->msg); | |
317 | ||
318 | req->xfer[1].rx_buf = &req->scratch; | |
319 | req->xfer[1].len = 2; | |
320 | ||
321 | /* for 1uF, settle for 800 usec; no cap, 100 usec. */ | |
322 | req->xfer[1].delay_usecs = ts->vref_delay_usecs; | |
323 | spi_message_add_tail(&req->xfer[1], &req->msg); | |
ebcaaad9 AS |
324 | |
325 | /* Enable reference voltage */ | |
326 | command |= ADS_PD10_REF_ON; | |
2c8dc071 | 327 | } |
ffa458c1 | 328 | |
ebcaaad9 AS |
329 | /* Enable ADC in every case */ |
330 | command |= ADS_PD10_ADC_ON; | |
331 | ||
ffa458c1 DB |
332 | /* take sample */ |
333 | req->command = (u8) command; | |
334 | req->xfer[2].tx_buf = &req->command; | |
335 | req->xfer[2].len = 1; | |
2c8dc071 DB |
336 | spi_message_add_tail(&req->xfer[2], &req->msg); |
337 | ||
ffa458c1 DB |
338 | req->xfer[3].rx_buf = &req->sample; |
339 | req->xfer[3].len = 2; | |
2c8dc071 | 340 | spi_message_add_tail(&req->xfer[3], &req->msg); |
ffa458c1 DB |
341 | |
342 | /* REVISIT: take a few more samples, and compare ... */ | |
343 | ||
969111e9 NF |
344 | /* converter in low power mode & enable PENIRQ */ |
345 | req->ref_off = PWRDOWN; | |
346 | req->xfer[4].tx_buf = &req->ref_off; | |
347 | req->xfer[4].len = 1; | |
348 | spi_message_add_tail(&req->xfer[4], &req->msg); | |
349 | ||
350 | req->xfer[5].rx_buf = &req->scratch; | |
351 | req->xfer[5].len = 2; | |
352 | CS_CHANGE(req->xfer[5]); | |
353 | spi_message_add_tail(&req->xfer[5], &req->msg); | |
ffa458c1 | 354 | |
2991a1ca JW |
355 | mutex_lock(&ts->lock); |
356 | ads7846_stop(ts); | |
ffa458c1 | 357 | status = spi_sync(spi, &req->msg); |
2991a1ca JW |
358 | ads7846_restart(ts); |
359 | mutex_unlock(&ts->lock); | |
ffa458c1 | 360 | |
c24b2602 MP |
361 | if (status == 0) { |
362 | /* on-wire is a must-ignore bit, a BE12 value, then padding */ | |
7c6d0ee1 DB |
363 | status = be16_to_cpu(req->sample); |
364 | status = status >> 3; | |
365 | status &= 0x0fff; | |
c24b2602 | 366 | } |
ffa458c1 | 367 | |
9084533e | 368 | kfree(req); |
7c6d0ee1 | 369 | return status; |
ffa458c1 DB |
370 | } |
371 | ||
3eac5c7e AG |
372 | static int ads7845_read12_ser(struct device *dev, unsigned command) |
373 | { | |
2991a1ca JW |
374 | struct spi_device *spi = to_spi_device(dev); |
375 | struct ads7846 *ts = dev_get_drvdata(dev); | |
376 | struct ads7845_ser_req *req; | |
377 | int status; | |
3eac5c7e | 378 | |
2991a1ca | 379 | req = kzalloc(sizeof *req, GFP_KERNEL); |
3eac5c7e AG |
380 | if (!req) |
381 | return -ENOMEM; | |
382 | ||
383 | spi_message_init(&req->msg); | |
384 | ||
385 | req->command[0] = (u8) command; | |
386 | req->xfer[0].tx_buf = req->command; | |
387 | req->xfer[0].rx_buf = req->sample; | |
388 | req->xfer[0].len = 3; | |
389 | spi_message_add_tail(&req->xfer[0], &req->msg); | |
390 | ||
2991a1ca JW |
391 | mutex_lock(&ts->lock); |
392 | ads7846_stop(ts); | |
3eac5c7e | 393 | status = spi_sync(spi, &req->msg); |
2991a1ca JW |
394 | ads7846_restart(ts); |
395 | mutex_unlock(&ts->lock); | |
3eac5c7e AG |
396 | |
397 | if (status == 0) { | |
398 | /* BE12 value, then padding */ | |
399 | status = be16_to_cpu(*((u16 *)&req->sample[1])); | |
400 | status = status >> 3; | |
401 | status &= 0x0fff; | |
402 | } | |
403 | ||
404 | kfree(req); | |
405 | return status; | |
406 | } | |
407 | ||
2c8dc071 DB |
408 | #if defined(CONFIG_HWMON) || defined(CONFIG_HWMON_MODULE) |
409 | ||
410 | #define SHOW(name, var, adjust) static ssize_t \ | |
ffa458c1 DB |
411 | name ## _show(struct device *dev, struct device_attribute *attr, char *buf) \ |
412 | { \ | |
2c8dc071 | 413 | struct ads7846 *ts = dev_get_drvdata(dev); \ |
ffa458c1 | 414 | ssize_t v = ads7846_read12_ser(dev, \ |
ebcaaad9 | 415 | READ_12BIT_SER(var)); \ |
ffa458c1 DB |
416 | if (v < 0) \ |
417 | return v; \ | |
2c8dc071 | 418 | return sprintf(buf, "%u\n", adjust(ts, v)); \ |
ffa458c1 DB |
419 | } \ |
420 | static DEVICE_ATTR(name, S_IRUGO, name ## _show, NULL); | |
421 | ||
2c8dc071 | 422 | |
b731d7b6 | 423 | /* Sysfs conventions report temperatures in millidegrees Celsius. |
2c8dc071 DB |
424 | * ADS7846 could use the low-accuracy two-sample scheme, but can't do the high |
425 | * accuracy scheme without calibration data. For now we won't try either; | |
426 | * userspace sees raw sensor values, and must scale/calibrate appropriately. | |
427 | */ | |
428 | static inline unsigned null_adjust(struct ads7846 *ts, ssize_t v) | |
429 | { | |
430 | return v; | |
431 | } | |
432 | ||
433 | SHOW(temp0, temp0, null_adjust) /* temp1_input */ | |
434 | SHOW(temp1, temp1, null_adjust) /* temp2_input */ | |
435 | ||
436 | ||
437 | /* sysfs conventions report voltages in millivolts. We can convert voltages | |
438 | * if we know vREF. userspace may need to scale vAUX to match the board's | |
439 | * external resistors; we assume that vBATT only uses the internal ones. | |
440 | */ | |
441 | static inline unsigned vaux_adjust(struct ads7846 *ts, ssize_t v) | |
442 | { | |
443 | unsigned retval = v; | |
444 | ||
445 | /* external resistors may scale vAUX into 0..vREF */ | |
7c6d0ee1 | 446 | retval *= ts->vref_mv; |
2c8dc071 | 447 | retval = retval >> 12; |
2991a1ca | 448 | |
2c8dc071 DB |
449 | return retval; |
450 | } | |
451 | ||
452 | static inline unsigned vbatt_adjust(struct ads7846 *ts, ssize_t v) | |
453 | { | |
454 | unsigned retval = vaux_adjust(ts, v); | |
455 | ||
456 | /* ads7846 has a resistor ladder to scale this signal down */ | |
457 | if (ts->model == 7846) | |
458 | retval *= 4; | |
2991a1ca | 459 | |
2c8dc071 DB |
460 | return retval; |
461 | } | |
462 | ||
463 | SHOW(in0_input, vaux, vaux_adjust) | |
464 | SHOW(in1_input, vbatt, vbatt_adjust) | |
465 | ||
2c8dc071 DB |
466 | static struct attribute *ads7846_attributes[] = { |
467 | &dev_attr_temp0.attr, | |
468 | &dev_attr_temp1.attr, | |
469 | &dev_attr_in0_input.attr, | |
470 | &dev_attr_in1_input.attr, | |
471 | NULL, | |
472 | }; | |
473 | ||
474 | static struct attribute_group ads7846_attr_group = { | |
475 | .attrs = ads7846_attributes, | |
476 | }; | |
477 | ||
478 | static struct attribute *ads7843_attributes[] = { | |
479 | &dev_attr_in0_input.attr, | |
480 | &dev_attr_in1_input.attr, | |
481 | NULL, | |
482 | }; | |
483 | ||
484 | static struct attribute_group ads7843_attr_group = { | |
485 | .attrs = ads7843_attributes, | |
486 | }; | |
487 | ||
488 | static struct attribute *ads7845_attributes[] = { | |
489 | &dev_attr_in0_input.attr, | |
490 | NULL, | |
491 | }; | |
492 | ||
493 | static struct attribute_group ads7845_attr_group = { | |
494 | .attrs = ads7845_attributes, | |
495 | }; | |
496 | ||
497 | static int ads784x_hwmon_register(struct spi_device *spi, struct ads7846 *ts) | |
498 | { | |
1beeffe4 | 499 | struct device *hwmon; |
2c8dc071 DB |
500 | int err; |
501 | ||
502 | /* hwmon sensors need a reference voltage */ | |
503 | switch (ts->model) { | |
504 | case 7846: | |
7c6d0ee1 | 505 | if (!ts->vref_mv) { |
2c8dc071 | 506 | dev_dbg(&spi->dev, "assuming 2.5V internal vREF\n"); |
7c6d0ee1 | 507 | ts->vref_mv = 2500; |
ebcaaad9 | 508 | ts->use_internal = true; |
2c8dc071 DB |
509 | } |
510 | break; | |
511 | case 7845: | |
512 | case 7843: | |
7c6d0ee1 | 513 | if (!ts->vref_mv) { |
2c8dc071 DB |
514 | dev_warn(&spi->dev, |
515 | "external vREF for ADS%d not specified\n", | |
516 | ts->model); | |
517 | return 0; | |
518 | } | |
519 | break; | |
520 | } | |
521 | ||
522 | /* different chips have different sensor groups */ | |
523 | switch (ts->model) { | |
524 | case 7846: | |
525 | ts->attr_group = &ads7846_attr_group; | |
526 | break; | |
527 | case 7845: | |
528 | ts->attr_group = &ads7845_attr_group; | |
529 | break; | |
530 | case 7843: | |
531 | ts->attr_group = &ads7843_attr_group; | |
532 | break; | |
533 | default: | |
534 | dev_dbg(&spi->dev, "ADS%d not recognized\n", ts->model); | |
535 | return 0; | |
536 | } | |
537 | ||
538 | err = sysfs_create_group(&spi->dev.kobj, ts->attr_group); | |
539 | if (err) | |
540 | return err; | |
541 | ||
542 | hwmon = hwmon_device_register(&spi->dev); | |
543 | if (IS_ERR(hwmon)) { | |
544 | sysfs_remove_group(&spi->dev.kobj, ts->attr_group); | |
545 | return PTR_ERR(hwmon); | |
546 | } | |
547 | ||
548 | ts->hwmon = hwmon; | |
549 | return 0; | |
550 | } | |
551 | ||
552 | static void ads784x_hwmon_unregister(struct spi_device *spi, | |
553 | struct ads7846 *ts) | |
554 | { | |
555 | if (ts->hwmon) { | |
556 | sysfs_remove_group(&spi->dev.kobj, ts->attr_group); | |
557 | hwmon_device_unregister(ts->hwmon); | |
558 | } | |
559 | } | |
560 | ||
561 | #else | |
562 | static inline int ads784x_hwmon_register(struct spi_device *spi, | |
563 | struct ads7846 *ts) | |
564 | { | |
565 | return 0; | |
566 | } | |
567 | ||
568 | static inline void ads784x_hwmon_unregister(struct spi_device *spi, | |
569 | struct ads7846 *ts) | |
570 | { | |
571 | } | |
572 | #endif | |
ffa458c1 | 573 | |
438f2a74 ID |
574 | static ssize_t ads7846_pen_down_show(struct device *dev, |
575 | struct device_attribute *attr, char *buf) | |
576 | { | |
2991a1ca JW |
577 | struct ads7846 *ts = dev_get_drvdata(dev); |
578 | ||
579 | return sprintf(buf, "%u\n", ts->pendown); | |
438f2a74 ID |
580 | } |
581 | ||
582 | static DEVICE_ATTR(pen_down, S_IRUGO, ads7846_pen_down_show, NULL); | |
583 | ||
7de90a8c ID |
584 | static ssize_t ads7846_disable_show(struct device *dev, |
585 | struct device_attribute *attr, char *buf) | |
586 | { | |
2991a1ca | 587 | struct ads7846 *ts = dev_get_drvdata(dev); |
7de90a8c ID |
588 | |
589 | return sprintf(buf, "%u\n", ts->disabled); | |
590 | } | |
591 | ||
592 | static ssize_t ads7846_disable_store(struct device *dev, | |
593 | struct device_attribute *attr, | |
594 | const char *buf, size_t count) | |
595 | { | |
596 | struct ads7846 *ts = dev_get_drvdata(dev); | |
3a0c58dd | 597 | unsigned long i; |
160f1fef JR |
598 | |
599 | if (strict_strtoul(buf, 10, &i)) | |
600 | return -EINVAL; | |
7de90a8c | 601 | |
7de90a8c ID |
602 | if (i) |
603 | ads7846_disable(ts); | |
604 | else | |
605 | ads7846_enable(ts); | |
606 | ||
7de90a8c ID |
607 | return count; |
608 | } | |
609 | ||
610 | static DEVICE_ATTR(disable, 0664, ads7846_disable_show, ads7846_disable_store); | |
611 | ||
2c8dc071 | 612 | static struct attribute *ads784x_attributes[] = { |
8dd51650 DT |
613 | &dev_attr_pen_down.attr, |
614 | &dev_attr_disable.attr, | |
615 | NULL, | |
616 | }; | |
617 | ||
2c8dc071 DB |
618 | static struct attribute_group ads784x_attr_group = { |
619 | .attrs = ads784x_attributes, | |
8dd51650 DT |
620 | }; |
621 | ||
ffa458c1 DB |
622 | /*--------------------------------------------------------------------------*/ |
623 | ||
4d5975e5 EM |
624 | static int get_pendown_state(struct ads7846 *ts) |
625 | { | |
626 | if (ts->get_pendown_state) | |
627 | return ts->get_pendown_state(); | |
628 | ||
629 | return !gpio_get_value(ts->gpio_pendown); | |
630 | } | |
631 | ||
fd746d54 EM |
632 | static void null_wait_for_sync(void) |
633 | { | |
634 | } | |
635 | ||
2991a1ca JW |
636 | static int ads7846_debounce_filter(void *ads, int data_idx, int *val) |
637 | { | |
638 | struct ads7846 *ts = ads; | |
639 | ||
640 | if (!ts->read_cnt || (abs(ts->last_read - *val) > ts->debounce_tol)) { | |
641 | /* Start over collecting consistent readings. */ | |
642 | ts->read_rep = 0; | |
643 | /* | |
644 | * Repeat it, if this was the first read or the read | |
645 | * wasn't consistent enough. | |
646 | */ | |
647 | if (ts->read_cnt < ts->debounce_max) { | |
648 | ts->last_read = *val; | |
649 | ts->read_cnt++; | |
650 | return ADS7846_FILTER_REPEAT; | |
651 | } else { | |
652 | /* | |
653 | * Maximum number of debouncing reached and still | |
654 | * not enough number of consistent readings. Abort | |
655 | * the whole sample, repeat it in the next sampling | |
656 | * period. | |
657 | */ | |
658 | ts->read_cnt = 0; | |
659 | return ADS7846_FILTER_IGNORE; | |
660 | } | |
661 | } else { | |
662 | if (++ts->read_rep > ts->debounce_rep) { | |
663 | /* | |
664 | * Got a good reading for this coordinate, | |
665 | * go for the next one. | |
666 | */ | |
667 | ts->read_cnt = 0; | |
668 | ts->read_rep = 0; | |
669 | return ADS7846_FILTER_OK; | |
670 | } else { | |
671 | /* Read more values that are consistent. */ | |
672 | ts->read_cnt++; | |
673 | return ADS7846_FILTER_REPEAT; | |
674 | } | |
675 | } | |
676 | } | |
677 | ||
678 | static int ads7846_no_filter(void *ads, int data_idx, int *val) | |
679 | { | |
680 | return ADS7846_FILTER_OK; | |
681 | } | |
682 | ||
683 | static int ads7846_get_value(struct ads7846 *ts, struct spi_message *m) | |
684 | { | |
685 | struct spi_transfer *t = | |
686 | list_entry(m->transfers.prev, struct spi_transfer, transfer_list); | |
687 | ||
688 | if (ts->model == 7845) { | |
689 | return be16_to_cpup((__be16 *)&(((char*)t->rx_buf)[1])) >> 3; | |
690 | } else { | |
691 | /* | |
692 | * adjust: on-wire is a must-ignore bit, a BE12 value, then | |
693 | * padding; built from two 8 bit values written msb-first. | |
694 | */ | |
695 | return be16_to_cpup((__be16 *)t->rx_buf) >> 3; | |
696 | } | |
697 | } | |
698 | ||
699 | static void ads7846_update_value(struct spi_message *m, int val) | |
700 | { | |
701 | struct spi_transfer *t = | |
702 | list_entry(m->transfers.prev, struct spi_transfer, transfer_list); | |
703 | ||
704 | *(u16 *)t->rx_buf = val; | |
705 | } | |
706 | ||
707 | static void ads7846_read_state(struct ads7846 *ts) | |
708 | { | |
709 | struct ads7846_packet *packet = ts->packet; | |
710 | struct spi_message *m; | |
711 | int msg_idx = 0; | |
712 | int val; | |
713 | int action; | |
714 | int error; | |
715 | ||
716 | while (msg_idx < ts->msg_count) { | |
717 | ||
718 | ts->wait_for_sync(); | |
719 | ||
720 | m = &ts->msg[msg_idx]; | |
721 | error = spi_sync(ts->spi, m); | |
722 | if (error) { | |
723 | dev_err(&ts->spi->dev, "spi_async --> %d\n", error); | |
724 | packet->tc.ignore = true; | |
725 | return; | |
726 | } | |
727 | ||
728 | /* | |
729 | * Last message is power down request, no need to convert | |
730 | * or filter the value. | |
731 | */ | |
732 | if (msg_idx < ts->msg_count - 1) { | |
ffa458c1 | 733 | |
2991a1ca JW |
734 | val = ads7846_get_value(ts, m); |
735 | ||
736 | action = ts->filter(ts->filter_data, msg_idx, &val); | |
737 | switch (action) { | |
738 | case ADS7846_FILTER_REPEAT: | |
739 | continue; | |
740 | ||
741 | case ADS7846_FILTER_IGNORE: | |
742 | packet->tc.ignore = true; | |
743 | msg_idx = ts->msg_count - 1; | |
744 | continue; | |
745 | ||
746 | case ADS7846_FILTER_OK: | |
747 | ads7846_update_value(m, val); | |
748 | packet->tc.ignore = false; | |
749 | msg_idx++; | |
750 | break; | |
751 | ||
752 | default: | |
753 | BUG(); | |
754 | } | |
755 | } else { | |
756 | msg_idx++; | |
757 | } | |
758 | } | |
759 | } | |
760 | ||
761 | static void ads7846_report_state(struct ads7846 *ts) | |
ffa458c1 | 762 | { |
2991a1ca JW |
763 | struct ads7846_packet *packet = ts->packet; |
764 | unsigned int Rt; | |
765 | u16 x, y, z1, z2; | |
ffa458c1 | 766 | |
2991a1ca JW |
767 | /* |
768 | * ads7846_get_value() does in-place conversion (including byte swap) | |
769 | * from on-the-wire format as part of debouncing to get stable | |
770 | * readings. | |
ffa458c1 | 771 | */ |
3eac5c7e AG |
772 | if (ts->model == 7845) { |
773 | x = *(u16 *)packet->tc.x_buf; | |
774 | y = *(u16 *)packet->tc.y_buf; | |
775 | z1 = 0; | |
776 | z2 = 0; | |
777 | } else { | |
778 | x = packet->tc.x; | |
779 | y = packet->tc.y; | |
780 | z1 = packet->tc.z1; | |
781 | z2 = packet->tc.z2; | |
782 | } | |
ffa458c1 DB |
783 | |
784 | /* range filtering */ | |
785 | if (x == MAX_12BIT) | |
786 | x = 0; | |
787 | ||
9460b652 HCE |
788 | if (ts->model == 7843) { |
789 | Rt = ts->pressure_max / 2; | |
3eac5c7e AG |
790 | } else if (ts->model == 7845) { |
791 | if (get_pendown_state(ts)) | |
792 | Rt = ts->pressure_max / 2; | |
793 | else | |
794 | Rt = 0; | |
795 | dev_vdbg(&ts->spi->dev, "x/y: %d/%d, PD %d\n", x, y, Rt); | |
9460b652 | 796 | } else if (likely(x && z1)) { |
ffa458c1 DB |
797 | /* compute touch pressure resistance using equation #2 */ |
798 | Rt = z2; | |
799 | Rt -= z1; | |
800 | Rt *= x; | |
801 | Rt *= ts->x_plate_ohms; | |
802 | Rt /= z1; | |
803 | Rt = (Rt + 2047) >> 12; | |
9460b652 | 804 | } else { |
ffa458c1 | 805 | Rt = 0; |
9460b652 | 806 | } |
969111e9 | 807 | |
2991a1ca JW |
808 | /* |
809 | * Sample found inconsistent by debouncing or pressure is beyond | |
1936d590 ID |
810 | * the maximum. Don't report it to user space, repeat at least |
811 | * once more the measurement | |
812 | */ | |
e8f462d2 | 813 | if (packet->tc.ignore || Rt > ts->pressure_max) { |
52ce4eaa PM |
814 | dev_vdbg(&ts->spi->dev, "ignored %d pressure %d\n", |
815 | packet->tc.ignore, Rt); | |
d5b415c9 ID |
816 | return; |
817 | } | |
818 | ||
2991a1ca JW |
819 | /* |
820 | * Maybe check the pendown state before reporting. This discards | |
1d25891f SH |
821 | * false readings when the pen is lifted. |
822 | */ | |
823 | if (ts->penirq_recheck_delay_usecs) { | |
824 | udelay(ts->penirq_recheck_delay_usecs); | |
4d5975e5 | 825 | if (!get_pendown_state(ts)) |
1d25891f SH |
826 | Rt = 0; |
827 | } | |
828 | ||
2991a1ca JW |
829 | /* |
830 | * NOTE: We can't rely on the pressure to determine the pen down | |
831 | * state, even this controller has a pressure sensor. The pressure | |
15e3589e ID |
832 | * value can fluctuate for quite a while after lifting the pen and |
833 | * in some cases may not even settle at the expected value. | |
ffa458c1 | 834 | * |
15e3589e ID |
835 | * The only safe way to check for the pen up condition is in the |
836 | * timer by reading the pen signal state (it's a GPIO _and_ IRQ). | |
ffa458c1 | 837 | */ |
ffa458c1 | 838 | if (Rt) { |
15e3589e | 839 | struct input_dev *input = ts->input; |
ae82d5ab | 840 | |
2991a1ca JW |
841 | if (ts->swap_xy) |
842 | swap(x, y); | |
843 | ||
15e3589e ID |
844 | if (!ts->pendown) { |
845 | input_report_key(input, BTN_TOUCH, 1); | |
2991a1ca | 846 | ts->pendown = true; |
52ce4eaa | 847 | dev_vdbg(&ts->spi->dev, "DOWN\n"); |
15e3589e | 848 | } |
86579a4c | 849 | |
15e3589e ID |
850 | input_report_abs(input, ABS_X, x); |
851 | input_report_abs(input, ABS_Y, y); | |
30ad7ba0 | 852 | input_report_abs(input, ABS_PRESSURE, ts->pressure_max - Rt); |
ffa458c1 | 853 | |
15e3589e | 854 | input_sync(input); |
52ce4eaa | 855 | dev_vdbg(&ts->spi->dev, "%4d/%4d/%4d\n", x, y, Rt); |
15e3589e | 856 | } |
da970e69 ID |
857 | } |
858 | ||
2991a1ca | 859 | static irqreturn_t ads7846_hard_irq(int irq, void *handle) |
da970e69 | 860 | { |
2991a1ca | 861 | struct ads7846 *ts = handle; |
da970e69 | 862 | |
2991a1ca | 863 | return get_pendown_state(ts) ? IRQ_WAKE_THREAD : IRQ_HANDLED; |
0b7018aa ID |
864 | } |
865 | ||
0b7018aa | 866 | |
7d12e780 | 867 | static irqreturn_t ads7846_irq(int irq, void *handle) |
0b7018aa ID |
868 | { |
869 | struct ads7846 *ts = handle; | |
7de90a8c | 870 | |
2991a1ca JW |
871 | /* Start with a small delay before checking pendown state */ |
872 | msleep(TS_POLL_DELAY); | |
ffa458c1 | 873 | |
2991a1ca | 874 | while (!ts->stopped && get_pendown_state(ts)) { |
ffa458c1 | 875 | |
2991a1ca JW |
876 | /* pen is down, continue with the measurement */ |
877 | ads7846_read_state(ts); | |
ffa458c1 | 878 | |
2991a1ca JW |
879 | if (!ts->stopped) |
880 | ads7846_report_state(ts); | |
c9e617a5 | 881 | |
2991a1ca JW |
882 | wait_event_timeout(ts->wait, ts->stopped, |
883 | msecs_to_jiffies(TS_POLL_PERIOD)); | |
ffa458c1 DB |
884 | } |
885 | ||
2991a1ca JW |
886 | if (ts->pendown) { |
887 | struct input_dev *input = ts->input; | |
7de90a8c | 888 | |
2991a1ca JW |
889 | input_report_key(input, BTN_TOUCH, 0); |
890 | input_report_abs(input, ABS_PRESSURE, 0); | |
891 | input_sync(input); | |
7de90a8c | 892 | |
2991a1ca JW |
893 | ts->pendown = false; |
894 | dev_vdbg(&ts->spi->dev, "UP\n"); | |
895 | } | |
91143379 | 896 | |
2991a1ca | 897 | return IRQ_HANDLED; |
7de90a8c ID |
898 | } |
899 | ||
3c36e719 MB |
900 | #ifdef CONFIG_PM_SLEEP |
901 | static int ads7846_suspend(struct device *dev) | |
7de90a8c | 902 | { |
3c36e719 | 903 | struct ads7846 *ts = dev_get_drvdata(dev); |
7de90a8c | 904 | |
2991a1ca | 905 | mutex_lock(&ts->lock); |
7de90a8c | 906 | |
2991a1ca | 907 | if (!ts->suspended) { |
7de90a8c | 908 | |
2991a1ca JW |
909 | if (!ts->disabled) |
910 | __ads7846_disable(ts); | |
7de90a8c | 911 | |
2991a1ca JW |
912 | if (device_may_wakeup(&ts->spi->dev)) |
913 | enable_irq_wake(ts->spi->irq); | |
fdba2bb1 | 914 | |
2991a1ca JW |
915 | ts->suspended = true; |
916 | } | |
917 | ||
918 | mutex_unlock(&ts->lock); | |
7de90a8c | 919 | |
2991a1ca | 920 | return 0; |
ffa458c1 DB |
921 | } |
922 | ||
3c36e719 | 923 | static int ads7846_resume(struct device *dev) |
ffa458c1 | 924 | { |
3c36e719 | 925 | struct ads7846 *ts = dev_get_drvdata(dev); |
ffa458c1 | 926 | |
2991a1ca JW |
927 | mutex_lock(&ts->lock); |
928 | ||
929 | if (ts->suspended) { | |
fdba2bb1 | 930 | |
2991a1ca | 931 | ts->suspended = false; |
7de90a8c | 932 | |
2991a1ca JW |
933 | if (device_may_wakeup(&ts->spi->dev)) |
934 | disable_irq_wake(ts->spi->irq); | |
7de90a8c | 935 | |
2991a1ca JW |
936 | if (!ts->disabled) |
937 | __ads7846_enable(ts); | |
938 | } | |
939 | ||
940 | mutex_unlock(&ts->lock); | |
7de90a8c | 941 | |
ffa458c1 DB |
942 | return 0; |
943 | } | |
3c36e719 MB |
944 | #endif |
945 | ||
946 | static SIMPLE_DEV_PM_OPS(ads7846_pm, ads7846_suspend, ads7846_resume); | |
ffa458c1 | 947 | |
2991a1ca | 948 | static int __devinit ads7846_setup_pendown(struct spi_device *spi, struct ads7846 *ts) |
4d5975e5 EM |
949 | { |
950 | struct ads7846_platform_data *pdata = spi->dev.platform_data; | |
951 | int err; | |
952 | ||
0fbc9fdb DT |
953 | /* |
954 | * REVISIT when the irq can be triggered active-low, or if for some | |
4d5975e5 EM |
955 | * reason the touchscreen isn't hooked up, we don't need to access |
956 | * the pendown state. | |
957 | */ | |
4d5975e5 EM |
958 | |
959 | if (pdata->get_pendown_state) { | |
960 | ts->get_pendown_state = pdata->get_pendown_state; | |
0fbc9fdb | 961 | } else if (gpio_is_valid(pdata->gpio_pendown)) { |
4d5975e5 | 962 | |
0fbc9fdb DT |
963 | err = gpio_request(pdata->gpio_pendown, "ads7846_pendown"); |
964 | if (err) { | |
965 | dev_err(&spi->dev, "failed to request pendown GPIO%d\n", | |
966 | pdata->gpio_pendown); | |
967 | return err; | |
968 | } | |
4d5975e5 | 969 | |
0fbc9fdb DT |
970 | ts->gpio_pendown = pdata->gpio_pendown; |
971 | ||
972 | } else { | |
973 | dev_err(&spi->dev, "no get_pendown_state nor gpio_pendown?\n"); | |
974 | return -EINVAL; | |
975 | } | |
2991a1ca | 976 | |
4d5975e5 EM |
977 | return 0; |
978 | } | |
979 | ||
2991a1ca JW |
980 | /* |
981 | * Set up the transfers to read touchscreen state; this assumes we | |
982 | * use formula #2 for pressure, not #3. | |
983 | */ | |
984 | static void __devinit ads7846_setup_spi_msg(struct ads7846 *ts, | |
985 | const struct ads7846_platform_data *pdata) | |
ffa458c1 | 986 | { |
2991a1ca JW |
987 | struct spi_message *m = &ts->msg[0]; |
988 | struct spi_transfer *x = ts->xfer; | |
989 | struct ads7846_packet *packet = ts->packet; | |
990 | int vref = pdata->keep_vref_on; | |
de2defd9 | 991 | |
06a09124 | 992 | if (ts->model == 7873) { |
2991a1ca JW |
993 | /* |
994 | * The AD7873 is almost identical to the ADS7846 | |
06a09124 | 995 | * keep VREF off during differential/ratiometric |
2991a1ca | 996 | * conversion modes. |
06a09124 MH |
997 | */ |
998 | ts->model = 7846; | |
999 | vref = 0; | |
1000 | } | |
1001 | ||
2991a1ca | 1002 | ts->msg_count = 1; |
0b7018aa | 1003 | spi_message_init(m); |
2991a1ca | 1004 | m->context = ts; |
0b7018aa | 1005 | |
3eac5c7e AG |
1006 | if (ts->model == 7845) { |
1007 | packet->read_y_cmd[0] = READ_Y(vref); | |
1008 | packet->read_y_cmd[1] = 0; | |
1009 | packet->read_y_cmd[2] = 0; | |
1010 | x->tx_buf = &packet->read_y_cmd[0]; | |
1011 | x->rx_buf = &packet->tc.y_buf[0]; | |
1012 | x->len = 3; | |
1013 | spi_message_add_tail(x, m); | |
1014 | } else { | |
1015 | /* y- still on; turn on only y+ (and ADC) */ | |
1016 | packet->read_y = READ_Y(vref); | |
1017 | x->tx_buf = &packet->read_y; | |
1018 | x->len = 1; | |
1019 | spi_message_add_tail(x, m); | |
d93f70b2 | 1020 | |
3eac5c7e AG |
1021 | x++; |
1022 | x->rx_buf = &packet->tc.y; | |
1023 | x->len = 2; | |
1024 | spi_message_add_tail(x, m); | |
1025 | } | |
0b7018aa | 1026 | |
2991a1ca JW |
1027 | /* |
1028 | * The first sample after switching drivers can be low quality; | |
e4f48861 SH |
1029 | * optionally discard it, using a second one after the signals |
1030 | * have had enough time to stabilize. | |
1031 | */ | |
1032 | if (pdata->settle_delay_usecs) { | |
1033 | x->delay_usecs = pdata->settle_delay_usecs; | |
1034 | ||
1035 | x++; | |
e8f462d2 | 1036 | x->tx_buf = &packet->read_y; |
e4f48861 SH |
1037 | x->len = 1; |
1038 | spi_message_add_tail(x, m); | |
1039 | ||
1040 | x++; | |
e8f462d2 | 1041 | x->rx_buf = &packet->tc.y; |
e4f48861 SH |
1042 | x->len = 2; |
1043 | spi_message_add_tail(x, m); | |
1044 | } | |
1045 | ||
2991a1ca | 1046 | ts->msg_count++; |
0b7018aa ID |
1047 | m++; |
1048 | spi_message_init(m); | |
2991a1ca | 1049 | m->context = ts; |
0b7018aa | 1050 | |
3eac5c7e AG |
1051 | if (ts->model == 7845) { |
1052 | x++; | |
1053 | packet->read_x_cmd[0] = READ_X(vref); | |
1054 | packet->read_x_cmd[1] = 0; | |
1055 | packet->read_x_cmd[2] = 0; | |
1056 | x->tx_buf = &packet->read_x_cmd[0]; | |
1057 | x->rx_buf = &packet->tc.x_buf[0]; | |
1058 | x->len = 3; | |
1059 | spi_message_add_tail(x, m); | |
1060 | } else { | |
1061 | /* turn y- off, x+ on, then leave in lowpower */ | |
1062 | x++; | |
1063 | packet->read_x = READ_X(vref); | |
1064 | x->tx_buf = &packet->read_x; | |
1065 | x->len = 1; | |
1066 | spi_message_add_tail(x, m); | |
0b7018aa | 1067 | |
3eac5c7e AG |
1068 | x++; |
1069 | x->rx_buf = &packet->tc.x; | |
1070 | x->len = 2; | |
1071 | spi_message_add_tail(x, m); | |
1072 | } | |
0b7018aa | 1073 | |
e4f48861 SH |
1074 | /* ... maybe discard first sample ... */ |
1075 | if (pdata->settle_delay_usecs) { | |
1076 | x->delay_usecs = pdata->settle_delay_usecs; | |
1077 | ||
1078 | x++; | |
e8f462d2 | 1079 | x->tx_buf = &packet->read_x; |
e4f48861 SH |
1080 | x->len = 1; |
1081 | spi_message_add_tail(x, m); | |
1082 | ||
1083 | x++; | |
e8f462d2 | 1084 | x->rx_buf = &packet->tc.x; |
e4f48861 SH |
1085 | x->len = 2; |
1086 | spi_message_add_tail(x, m); | |
1087 | } | |
1088 | ||
ffa458c1 DB |
1089 | /* turn y+ off, x- on; we'll use formula #2 */ |
1090 | if (ts->model == 7846) { | |
2991a1ca | 1091 | ts->msg_count++; |
0b7018aa ID |
1092 | m++; |
1093 | spi_message_init(m); | |
2991a1ca | 1094 | m->context = ts; |
0b7018aa | 1095 | |
d93f70b2 | 1096 | x++; |
e8f462d2 DT |
1097 | packet->read_z1 = READ_Z1(vref); |
1098 | x->tx_buf = &packet->read_z1; | |
ffa458c1 | 1099 | x->len = 1; |
0b7018aa | 1100 | spi_message_add_tail(x, m); |
d93f70b2 | 1101 | |
ffa458c1 | 1102 | x++; |
e8f462d2 | 1103 | x->rx_buf = &packet->tc.z1; |
ffa458c1 | 1104 | x->len = 2; |
0b7018aa ID |
1105 | spi_message_add_tail(x, m); |
1106 | ||
e4f48861 SH |
1107 | /* ... maybe discard first sample ... */ |
1108 | if (pdata->settle_delay_usecs) { | |
1109 | x->delay_usecs = pdata->settle_delay_usecs; | |
1110 | ||
1111 | x++; | |
e8f462d2 | 1112 | x->tx_buf = &packet->read_z1; |
e4f48861 SH |
1113 | x->len = 1; |
1114 | spi_message_add_tail(x, m); | |
1115 | ||
1116 | x++; | |
e8f462d2 | 1117 | x->rx_buf = &packet->tc.z1; |
e4f48861 SH |
1118 | x->len = 2; |
1119 | spi_message_add_tail(x, m); | |
1120 | } | |
1121 | ||
2991a1ca | 1122 | ts->msg_count++; |
0b7018aa ID |
1123 | m++; |
1124 | spi_message_init(m); | |
2991a1ca | 1125 | m->context = ts; |
ffa458c1 | 1126 | |
d93f70b2 | 1127 | x++; |
e8f462d2 DT |
1128 | packet->read_z2 = READ_Z2(vref); |
1129 | x->tx_buf = &packet->read_z2; | |
ffa458c1 | 1130 | x->len = 1; |
0b7018aa | 1131 | spi_message_add_tail(x, m); |
d93f70b2 | 1132 | |
ffa458c1 | 1133 | x++; |
e8f462d2 | 1134 | x->rx_buf = &packet->tc.z2; |
ffa458c1 | 1135 | x->len = 2; |
0b7018aa | 1136 | spi_message_add_tail(x, m); |
ffa458c1 | 1137 | |
e4f48861 SH |
1138 | /* ... maybe discard first sample ... */ |
1139 | if (pdata->settle_delay_usecs) { | |
1140 | x->delay_usecs = pdata->settle_delay_usecs; | |
1141 | ||
1142 | x++; | |
e8f462d2 | 1143 | x->tx_buf = &packet->read_z2; |
e4f48861 SH |
1144 | x->len = 1; |
1145 | spi_message_add_tail(x, m); | |
1146 | ||
1147 | x++; | |
e8f462d2 | 1148 | x->rx_buf = &packet->tc.z2; |
e4f48861 SH |
1149 | x->len = 2; |
1150 | spi_message_add_tail(x, m); | |
1151 | } | |
0b7018aa | 1152 | } |
53a0ef89 ID |
1153 | |
1154 | /* power down */ | |
2991a1ca | 1155 | ts->msg_count++; |
0b7018aa ID |
1156 | m++; |
1157 | spi_message_init(m); | |
2991a1ca | 1158 | m->context = ts; |
0b7018aa | 1159 | |
3eac5c7e AG |
1160 | if (ts->model == 7845) { |
1161 | x++; | |
1162 | packet->pwrdown_cmd[0] = PWRDOWN; | |
1163 | packet->pwrdown_cmd[1] = 0; | |
1164 | packet->pwrdown_cmd[2] = 0; | |
1165 | x->tx_buf = &packet->pwrdown_cmd[0]; | |
1166 | x->len = 3; | |
1167 | } else { | |
1168 | x++; | |
1169 | packet->pwrdown = PWRDOWN; | |
1170 | x->tx_buf = &packet->pwrdown; | |
1171 | x->len = 1; | |
1172 | spi_message_add_tail(x, m); | |
1173 | ||
1174 | x++; | |
1175 | x->rx_buf = &packet->dummy; | |
1176 | x->len = 2; | |
1177 | } | |
53a0ef89 | 1178 | |
d93f70b2 | 1179 | CS_CHANGE(*x); |
0b7018aa | 1180 | spi_message_add_tail(x, m); |
2991a1ca | 1181 | } |
ffa458c1 | 1182 | |
2991a1ca JW |
1183 | static int __devinit ads7846_probe(struct spi_device *spi) |
1184 | { | |
1185 | struct ads7846 *ts; | |
1186 | struct ads7846_packet *packet; | |
1187 | struct input_dev *input_dev; | |
1188 | struct ads7846_platform_data *pdata = spi->dev.platform_data; | |
1189 | unsigned long irq_flags; | |
1190 | int err; | |
1191 | ||
1192 | if (!spi->irq) { | |
1193 | dev_dbg(&spi->dev, "no IRQ?\n"); | |
1194 | return -ENODEV; | |
1195 | } | |
1196 | ||
1197 | if (!pdata) { | |
1198 | dev_dbg(&spi->dev, "no platform data?\n"); | |
1199 | return -ENODEV; | |
1200 | } | |
1201 | ||
1202 | /* don't exceed max specified sample rate */ | |
1203 | if (spi->max_speed_hz > (125000 * SAMPLE_BITS)) { | |
1204 | dev_dbg(&spi->dev, "f(sample) %d KHz?\n", | |
1205 | (spi->max_speed_hz/SAMPLE_BITS)/1000); | |
1206 | return -EINVAL; | |
1207 | } | |
1208 | ||
1209 | /* We'd set TX word size 8 bits and RX word size to 13 bits ... except | |
1210 | * that even if the hardware can do that, the SPI controller driver | |
1211 | * may not. So we stick to very-portable 8 bit words, both RX and TX. | |
1212 | */ | |
1213 | spi->bits_per_word = 8; | |
1214 | spi->mode = SPI_MODE_0; | |
1215 | err = spi_setup(spi); | |
1216 | if (err < 0) | |
1217 | return err; | |
ffa458c1 | 1218 | |
2991a1ca JW |
1219 | ts = kzalloc(sizeof(struct ads7846), GFP_KERNEL); |
1220 | packet = kzalloc(sizeof(struct ads7846_packet), GFP_KERNEL); | |
1221 | input_dev = input_allocate_device(); | |
1222 | if (!ts || !packet || !input_dev) { | |
1223 | err = -ENOMEM; | |
1224 | goto err_free_mem; | |
1225 | } | |
1226 | ||
1227 | dev_set_drvdata(&spi->dev, ts); | |
1228 | ||
1229 | ts->packet = packet; | |
1230 | ts->spi = spi; | |
1231 | ts->input = input_dev; | |
1232 | ts->vref_mv = pdata->vref_mv; | |
1233 | ts->swap_xy = pdata->swap_xy; | |
1234 | ||
1235 | mutex_init(&ts->lock); | |
1236 | init_waitqueue_head(&ts->wait); | |
1237 | ||
1238 | ts->model = pdata->model ? : 7846; | |
1239 | ts->vref_delay_usecs = pdata->vref_delay_usecs ? : 100; | |
1240 | ts->x_plate_ohms = pdata->x_plate_ohms ? : 400; | |
1241 | ts->pressure_max = pdata->pressure_max ? : ~0; | |
1242 | ||
1243 | if (pdata->filter != NULL) { | |
1244 | if (pdata->filter_init != NULL) { | |
1245 | err = pdata->filter_init(pdata, &ts->filter_data); | |
1246 | if (err < 0) | |
1247 | goto err_free_mem; | |
1248 | } | |
1249 | ts->filter = pdata->filter; | |
1250 | ts->filter_cleanup = pdata->filter_cleanup; | |
1251 | } else if (pdata->debounce_max) { | |
1252 | ts->debounce_max = pdata->debounce_max; | |
1253 | if (ts->debounce_max < 2) | |
1254 | ts->debounce_max = 2; | |
1255 | ts->debounce_tol = pdata->debounce_tol; | |
1256 | ts->debounce_rep = pdata->debounce_rep; | |
1257 | ts->filter = ads7846_debounce_filter; | |
1258 | ts->filter_data = ts; | |
1259 | } else { | |
1260 | ts->filter = ads7846_no_filter; | |
1261 | } | |
1262 | ||
1263 | err = ads7846_setup_pendown(spi, ts); | |
1264 | if (err) | |
1265 | goto err_cleanup_filter; | |
1266 | ||
1267 | if (pdata->penirq_recheck_delay_usecs) | |
1268 | ts->penirq_recheck_delay_usecs = | |
1269 | pdata->penirq_recheck_delay_usecs; | |
1270 | ||
1271 | ts->wait_for_sync = pdata->wait_for_sync ? : null_wait_for_sync; | |
1272 | ||
1273 | snprintf(ts->phys, sizeof(ts->phys), "%s/input0", dev_name(&spi->dev)); | |
1274 | snprintf(ts->name, sizeof(ts->name), "ADS%d Touchscreen", ts->model); | |
1275 | ||
1276 | input_dev->name = ts->name; | |
1277 | input_dev->phys = ts->phys; | |
1278 | input_dev->dev.parent = &spi->dev; | |
1279 | ||
1280 | input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS); | |
1281 | input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH); | |
1282 | input_set_abs_params(input_dev, ABS_X, | |
1283 | pdata->x_min ? : 0, | |
1284 | pdata->x_max ? : MAX_12BIT, | |
1285 | 0, 0); | |
1286 | input_set_abs_params(input_dev, ABS_Y, | |
1287 | pdata->y_min ? : 0, | |
1288 | pdata->y_max ? : MAX_12BIT, | |
1289 | 0, 0); | |
1290 | input_set_abs_params(input_dev, ABS_PRESSURE, | |
1291 | pdata->pressure_min, pdata->pressure_max, 0, 0); | |
1292 | ||
1293 | ads7846_setup_spi_msg(ts, pdata); | |
d5b415c9 | 1294 | |
91143379 GI |
1295 | ts->reg = regulator_get(&spi->dev, "vcc"); |
1296 | if (IS_ERR(ts->reg)) { | |
067fb2f6 | 1297 | err = PTR_ERR(ts->reg); |
56960b36 | 1298 | dev_err(&spi->dev, "unable to get regulator: %d\n", err); |
91143379 GI |
1299 | goto err_free_gpio; |
1300 | } | |
1301 | ||
1302 | err = regulator_enable(ts->reg); | |
1303 | if (err) { | |
1304 | dev_err(&spi->dev, "unable to enable regulator: %d\n", err); | |
1305 | goto err_put_regulator; | |
1306 | } | |
1307 | ||
0f622bf4 | 1308 | irq_flags = pdata->irq_flags ? : IRQF_TRIGGER_FALLING; |
2991a1ca | 1309 | irq_flags |= IRQF_ONESHOT; |
7804302b | 1310 | |
2991a1ca JW |
1311 | err = request_threaded_irq(spi->irq, ads7846_hard_irq, ads7846_irq, |
1312 | irq_flags, spi->dev.driver->name, ts); | |
0f622bf4 | 1313 | if (err && !pdata->irq_flags) { |
c57c0a2a MR |
1314 | dev_info(&spi->dev, |
1315 | "trying pin change workaround on irq %d\n", spi->irq); | |
2991a1ca JW |
1316 | irq_flags |= IRQF_TRIGGER_RISING; |
1317 | err = request_threaded_irq(spi->irq, | |
1318 | ads7846_hard_irq, ads7846_irq, | |
1319 | irq_flags, spi->dev.driver->name, ts); | |
0f622bf4 DT |
1320 | } |
1321 | ||
1322 | if (err) { | |
1323 | dev_dbg(&spi->dev, "irq %d busy?\n", spi->irq); | |
1324 | goto err_disable_regulator; | |
ffa458c1 | 1325 | } |
ffa458c1 | 1326 | |
2c8dc071 DB |
1327 | err = ads784x_hwmon_register(spi, ts); |
1328 | if (err) | |
1329 | goto err_free_irq; | |
1330 | ||
2e5a7bd9 | 1331 | dev_info(&spi->dev, "touchscreen, irq %d\n", spi->irq); |
ffa458c1 | 1332 | |
2991a1ca JW |
1333 | /* |
1334 | * Take a first sample, leaving nPENIRQ active and vREF off; avoid | |
ffa458c1 DB |
1335 | * the touchscreen, in case it's not connected. |
1336 | */ | |
3eac5c7e AG |
1337 | if (ts->model == 7845) |
1338 | ads7845_read12_ser(&spi->dev, PWRDOWN); | |
1339 | else | |
ebcaaad9 | 1340 | (void) ads7846_read12_ser(&spi->dev, READ_12BIT_SER(vaux)); |
ffa458c1 | 1341 | |
2c8dc071 | 1342 | err = sysfs_create_group(&spi->dev.kobj, &ads784x_attr_group); |
8dd51650 | 1343 | if (err) |
2c8dc071 | 1344 | goto err_remove_hwmon; |
7de90a8c | 1345 | |
a90f7e98 DT |
1346 | err = input_register_device(input_dev); |
1347 | if (err) | |
8dd51650 | 1348 | goto err_remove_attr_group; |
a90f7e98 | 1349 | |
fdba2bb1 RL |
1350 | device_init_wakeup(&spi->dev, pdata->wakeup); |
1351 | ||
ffa458c1 | 1352 | return 0; |
a90f7e98 | 1353 | |
8dd51650 | 1354 | err_remove_attr_group: |
2c8dc071 DB |
1355 | sysfs_remove_group(&spi->dev.kobj, &ads784x_attr_group); |
1356 | err_remove_hwmon: | |
1357 | ads784x_hwmon_unregister(spi, ts); | |
8dd51650 | 1358 | err_free_irq: |
a90f7e98 | 1359 | free_irq(spi->irq, ts); |
91143379 GI |
1360 | err_disable_regulator: |
1361 | regulator_disable(ts->reg); | |
1362 | err_put_regulator: | |
1363 | regulator_put(ts->reg); | |
4d5975e5 | 1364 | err_free_gpio: |
0fbc9fdb | 1365 | if (!ts->get_pendown_state) |
4d5975e5 | 1366 | gpio_free(ts->gpio_pendown); |
da970e69 ID |
1367 | err_cleanup_filter: |
1368 | if (ts->filter_cleanup) | |
1369 | ts->filter_cleanup(ts->filter_data); | |
a90f7e98 DT |
1370 | err_free_mem: |
1371 | input_free_device(input_dev); | |
e8f462d2 | 1372 | kfree(packet); |
a90f7e98 DT |
1373 | kfree(ts); |
1374 | return err; | |
ffa458c1 DB |
1375 | } |
1376 | ||
2e5a7bd9 | 1377 | static int __devexit ads7846_remove(struct spi_device *spi) |
ffa458c1 | 1378 | { |
2991a1ca | 1379 | struct ads7846 *ts = dev_get_drvdata(&spi->dev); |
ffa458c1 | 1380 | |
fdba2bb1 RL |
1381 | device_init_wakeup(&spi->dev, false); |
1382 | ||
2c8dc071 | 1383 | sysfs_remove_group(&spi->dev.kobj, &ads784x_attr_group); |
ffa458c1 | 1384 | |
2991a1ca | 1385 | ads7846_disable(ts); |
7de90a8c | 1386 | free_irq(ts->spi->irq, ts); |
2991a1ca JW |
1387 | |
1388 | input_unregister_device(ts->input); | |
1389 | ||
1390 | ads784x_hwmon_unregister(spi, ts); | |
7de90a8c | 1391 | |
91143379 GI |
1392 | regulator_disable(ts->reg); |
1393 | regulator_put(ts->reg); | |
1394 | ||
0fbc9fdb DT |
1395 | if (!ts->get_pendown_state) { |
1396 | /* | |
1397 | * If we are not using specialized pendown method we must | |
1398 | * have been relying on gpio we set up ourselves. | |
1399 | */ | |
4d5975e5 | 1400 | gpio_free(ts->gpio_pendown); |
0fbc9fdb | 1401 | } |
4d5975e5 | 1402 | |
da970e69 ID |
1403 | if (ts->filter_cleanup) |
1404 | ts->filter_cleanup(ts->filter_data); | |
1405 | ||
e8f462d2 | 1406 | kfree(ts->packet); |
ffa458c1 DB |
1407 | kfree(ts); |
1408 | ||
2e5a7bd9 | 1409 | dev_dbg(&spi->dev, "unregistered touchscreen\n"); |
2991a1ca | 1410 | |
ffa458c1 DB |
1411 | return 0; |
1412 | } | |
1413 | ||
2e5a7bd9 DB |
1414 | static struct spi_driver ads7846_driver = { |
1415 | .driver = { | |
1416 | .name = "ads7846", | |
1417 | .bus = &spi_bus_type, | |
1418 | .owner = THIS_MODULE, | |
3c36e719 | 1419 | .pm = &ads7846_pm, |
2e5a7bd9 | 1420 | }, |
ffa458c1 | 1421 | .probe = ads7846_probe, |
2e5a7bd9 | 1422 | .remove = __devexit_p(ads7846_remove), |
ffa458c1 DB |
1423 | }; |
1424 | ||
1425 | static int __init ads7846_init(void) | |
1426 | { | |
2e5a7bd9 | 1427 | return spi_register_driver(&ads7846_driver); |
ffa458c1 DB |
1428 | } |
1429 | module_init(ads7846_init); | |
1430 | ||
1431 | static void __exit ads7846_exit(void) | |
1432 | { | |
2e5a7bd9 | 1433 | spi_unregister_driver(&ads7846_driver); |
ffa458c1 DB |
1434 | } |
1435 | module_exit(ads7846_exit); | |
1436 | ||
1437 | MODULE_DESCRIPTION("ADS7846 TouchScreen Driver"); | |
1438 | MODULE_LICENSE("GPL"); | |
e0626e38 | 1439 | MODULE_ALIAS("spi:ads7846"); |