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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 | */ | |
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 | 284 | u16 scratch; |
ffa458c1 DB |
285 | struct spi_message msg; |
286 | struct spi_transfer xfer[6]; | |
1dbe7dad AS |
287 | /* |
288 | * DMA (thus cache coherency maintenance) requires the | |
289 | * transfer buffers to live in their own cache lines. | |
290 | */ | |
291 | __be16 sample ____cacheline_aligned; | |
ffa458c1 DB |
292 | }; |
293 | ||
3eac5c7e AG |
294 | struct ads7845_ser_req { |
295 | u8 command[3]; | |
3eac5c7e AG |
296 | struct spi_message msg; |
297 | struct spi_transfer xfer[2]; | |
1dbe7dad AS |
298 | /* |
299 | * DMA (thus cache coherency maintenance) requires the | |
300 | * transfer buffers to live in their own cache lines. | |
301 | */ | |
302 | u8 sample[3] ____cacheline_aligned; | |
3eac5c7e AG |
303 | }; |
304 | ||
ffa458c1 DB |
305 | static int ads7846_read12_ser(struct device *dev, unsigned command) |
306 | { | |
2991a1ca JW |
307 | struct spi_device *spi = to_spi_device(dev); |
308 | struct ads7846 *ts = dev_get_drvdata(dev); | |
309 | struct ser_req *req; | |
310 | int status; | |
ffa458c1 | 311 | |
2991a1ca | 312 | req = kzalloc(sizeof *req, GFP_KERNEL); |
ffa458c1 DB |
313 | if (!req) |
314 | return -ENOMEM; | |
315 | ||
0b7018aa | 316 | spi_message_init(&req->msg); |
8275c642 | 317 | |
2c8dc071 | 318 | /* maybe turn on internal vREF, and let it settle */ |
ebcaaad9 | 319 | if (ts->use_internal) { |
2c8dc071 DB |
320 | req->ref_on = REF_ON; |
321 | req->xfer[0].tx_buf = &req->ref_on; | |
322 | req->xfer[0].len = 1; | |
323 | spi_message_add_tail(&req->xfer[0], &req->msg); | |
324 | ||
325 | req->xfer[1].rx_buf = &req->scratch; | |
326 | req->xfer[1].len = 2; | |
327 | ||
328 | /* for 1uF, settle for 800 usec; no cap, 100 usec. */ | |
329 | req->xfer[1].delay_usecs = ts->vref_delay_usecs; | |
330 | spi_message_add_tail(&req->xfer[1], &req->msg); | |
ebcaaad9 AS |
331 | |
332 | /* Enable reference voltage */ | |
333 | command |= ADS_PD10_REF_ON; | |
2c8dc071 | 334 | } |
ffa458c1 | 335 | |
ebcaaad9 AS |
336 | /* Enable ADC in every case */ |
337 | command |= ADS_PD10_ADC_ON; | |
338 | ||
ffa458c1 DB |
339 | /* take sample */ |
340 | req->command = (u8) command; | |
341 | req->xfer[2].tx_buf = &req->command; | |
342 | req->xfer[2].len = 1; | |
2c8dc071 DB |
343 | spi_message_add_tail(&req->xfer[2], &req->msg); |
344 | ||
ffa458c1 DB |
345 | req->xfer[3].rx_buf = &req->sample; |
346 | req->xfer[3].len = 2; | |
2c8dc071 | 347 | spi_message_add_tail(&req->xfer[3], &req->msg); |
ffa458c1 DB |
348 | |
349 | /* REVISIT: take a few more samples, and compare ... */ | |
350 | ||
969111e9 NF |
351 | /* converter in low power mode & enable PENIRQ */ |
352 | req->ref_off = PWRDOWN; | |
353 | req->xfer[4].tx_buf = &req->ref_off; | |
354 | req->xfer[4].len = 1; | |
355 | spi_message_add_tail(&req->xfer[4], &req->msg); | |
356 | ||
357 | req->xfer[5].rx_buf = &req->scratch; | |
358 | req->xfer[5].len = 2; | |
359 | CS_CHANGE(req->xfer[5]); | |
360 | spi_message_add_tail(&req->xfer[5], &req->msg); | |
ffa458c1 | 361 | |
2991a1ca JW |
362 | mutex_lock(&ts->lock); |
363 | ads7846_stop(ts); | |
ffa458c1 | 364 | status = spi_sync(spi, &req->msg); |
2991a1ca JW |
365 | ads7846_restart(ts); |
366 | mutex_unlock(&ts->lock); | |
ffa458c1 | 367 | |
c24b2602 MP |
368 | if (status == 0) { |
369 | /* on-wire is a must-ignore bit, a BE12 value, then padding */ | |
7c6d0ee1 DB |
370 | status = be16_to_cpu(req->sample); |
371 | status = status >> 3; | |
372 | status &= 0x0fff; | |
c24b2602 | 373 | } |
ffa458c1 | 374 | |
9084533e | 375 | kfree(req); |
7c6d0ee1 | 376 | return status; |
ffa458c1 DB |
377 | } |
378 | ||
3eac5c7e AG |
379 | static int ads7845_read12_ser(struct device *dev, unsigned command) |
380 | { | |
2991a1ca JW |
381 | struct spi_device *spi = to_spi_device(dev); |
382 | struct ads7846 *ts = dev_get_drvdata(dev); | |
383 | struct ads7845_ser_req *req; | |
384 | int status; | |
3eac5c7e | 385 | |
2991a1ca | 386 | req = kzalloc(sizeof *req, GFP_KERNEL); |
3eac5c7e AG |
387 | if (!req) |
388 | return -ENOMEM; | |
389 | ||
390 | spi_message_init(&req->msg); | |
391 | ||
392 | req->command[0] = (u8) command; | |
393 | req->xfer[0].tx_buf = req->command; | |
394 | req->xfer[0].rx_buf = req->sample; | |
395 | req->xfer[0].len = 3; | |
396 | spi_message_add_tail(&req->xfer[0], &req->msg); | |
397 | ||
2991a1ca JW |
398 | mutex_lock(&ts->lock); |
399 | ads7846_stop(ts); | |
3eac5c7e | 400 | status = spi_sync(spi, &req->msg); |
2991a1ca JW |
401 | ads7846_restart(ts); |
402 | mutex_unlock(&ts->lock); | |
3eac5c7e AG |
403 | |
404 | if (status == 0) { | |
405 | /* BE12 value, then padding */ | |
406 | status = be16_to_cpu(*((u16 *)&req->sample[1])); | |
407 | status = status >> 3; | |
408 | status &= 0x0fff; | |
409 | } | |
410 | ||
411 | kfree(req); | |
412 | return status; | |
413 | } | |
414 | ||
2c8dc071 DB |
415 | #if defined(CONFIG_HWMON) || defined(CONFIG_HWMON_MODULE) |
416 | ||
417 | #define SHOW(name, var, adjust) static ssize_t \ | |
ffa458c1 DB |
418 | name ## _show(struct device *dev, struct device_attribute *attr, char *buf) \ |
419 | { \ | |
2c8dc071 | 420 | struct ads7846 *ts = dev_get_drvdata(dev); \ |
ffa458c1 | 421 | ssize_t v = ads7846_read12_ser(dev, \ |
ebcaaad9 | 422 | READ_12BIT_SER(var)); \ |
ffa458c1 DB |
423 | if (v < 0) \ |
424 | return v; \ | |
2c8dc071 | 425 | return sprintf(buf, "%u\n", adjust(ts, v)); \ |
ffa458c1 DB |
426 | } \ |
427 | static DEVICE_ATTR(name, S_IRUGO, name ## _show, NULL); | |
428 | ||
2c8dc071 | 429 | |
b731d7b6 | 430 | /* Sysfs conventions report temperatures in millidegrees Celsius. |
2c8dc071 DB |
431 | * ADS7846 could use the low-accuracy two-sample scheme, but can't do the high |
432 | * accuracy scheme without calibration data. For now we won't try either; | |
433 | * userspace sees raw sensor values, and must scale/calibrate appropriately. | |
434 | */ | |
435 | static inline unsigned null_adjust(struct ads7846 *ts, ssize_t v) | |
436 | { | |
437 | return v; | |
438 | } | |
439 | ||
440 | SHOW(temp0, temp0, null_adjust) /* temp1_input */ | |
441 | SHOW(temp1, temp1, null_adjust) /* temp2_input */ | |
442 | ||
443 | ||
444 | /* sysfs conventions report voltages in millivolts. We can convert voltages | |
445 | * if we know vREF. userspace may need to scale vAUX to match the board's | |
446 | * external resistors; we assume that vBATT only uses the internal ones. | |
447 | */ | |
448 | static inline unsigned vaux_adjust(struct ads7846 *ts, ssize_t v) | |
449 | { | |
450 | unsigned retval = v; | |
451 | ||
452 | /* external resistors may scale vAUX into 0..vREF */ | |
7c6d0ee1 | 453 | retval *= ts->vref_mv; |
2c8dc071 | 454 | retval = retval >> 12; |
2991a1ca | 455 | |
2c8dc071 DB |
456 | return retval; |
457 | } | |
458 | ||
459 | static inline unsigned vbatt_adjust(struct ads7846 *ts, ssize_t v) | |
460 | { | |
461 | unsigned retval = vaux_adjust(ts, v); | |
462 | ||
463 | /* ads7846 has a resistor ladder to scale this signal down */ | |
464 | if (ts->model == 7846) | |
465 | retval *= 4; | |
2991a1ca | 466 | |
2c8dc071 DB |
467 | return retval; |
468 | } | |
469 | ||
470 | SHOW(in0_input, vaux, vaux_adjust) | |
471 | SHOW(in1_input, vbatt, vbatt_adjust) | |
472 | ||
2c8dc071 DB |
473 | static struct attribute *ads7846_attributes[] = { |
474 | &dev_attr_temp0.attr, | |
475 | &dev_attr_temp1.attr, | |
476 | &dev_attr_in0_input.attr, | |
477 | &dev_attr_in1_input.attr, | |
478 | NULL, | |
479 | }; | |
480 | ||
481 | static struct attribute_group ads7846_attr_group = { | |
482 | .attrs = ads7846_attributes, | |
483 | }; | |
484 | ||
485 | static struct attribute *ads7843_attributes[] = { | |
486 | &dev_attr_in0_input.attr, | |
487 | &dev_attr_in1_input.attr, | |
488 | NULL, | |
489 | }; | |
490 | ||
491 | static struct attribute_group ads7843_attr_group = { | |
492 | .attrs = ads7843_attributes, | |
493 | }; | |
494 | ||
495 | static struct attribute *ads7845_attributes[] = { | |
496 | &dev_attr_in0_input.attr, | |
497 | NULL, | |
498 | }; | |
499 | ||
500 | static struct attribute_group ads7845_attr_group = { | |
501 | .attrs = ads7845_attributes, | |
502 | }; | |
503 | ||
504 | static int ads784x_hwmon_register(struct spi_device *spi, struct ads7846 *ts) | |
505 | { | |
1beeffe4 | 506 | struct device *hwmon; |
2c8dc071 DB |
507 | int err; |
508 | ||
509 | /* hwmon sensors need a reference voltage */ | |
510 | switch (ts->model) { | |
511 | case 7846: | |
7c6d0ee1 | 512 | if (!ts->vref_mv) { |
2c8dc071 | 513 | dev_dbg(&spi->dev, "assuming 2.5V internal vREF\n"); |
7c6d0ee1 | 514 | ts->vref_mv = 2500; |
ebcaaad9 | 515 | ts->use_internal = true; |
2c8dc071 DB |
516 | } |
517 | break; | |
518 | case 7845: | |
519 | case 7843: | |
7c6d0ee1 | 520 | if (!ts->vref_mv) { |
2c8dc071 DB |
521 | dev_warn(&spi->dev, |
522 | "external vREF for ADS%d not specified\n", | |
523 | ts->model); | |
524 | return 0; | |
525 | } | |
526 | break; | |
527 | } | |
528 | ||
529 | /* different chips have different sensor groups */ | |
530 | switch (ts->model) { | |
531 | case 7846: | |
532 | ts->attr_group = &ads7846_attr_group; | |
533 | break; | |
534 | case 7845: | |
535 | ts->attr_group = &ads7845_attr_group; | |
536 | break; | |
537 | case 7843: | |
538 | ts->attr_group = &ads7843_attr_group; | |
539 | break; | |
540 | default: | |
541 | dev_dbg(&spi->dev, "ADS%d not recognized\n", ts->model); | |
542 | return 0; | |
543 | } | |
544 | ||
545 | err = sysfs_create_group(&spi->dev.kobj, ts->attr_group); | |
546 | if (err) | |
547 | return err; | |
548 | ||
549 | hwmon = hwmon_device_register(&spi->dev); | |
550 | if (IS_ERR(hwmon)) { | |
551 | sysfs_remove_group(&spi->dev.kobj, ts->attr_group); | |
552 | return PTR_ERR(hwmon); | |
553 | } | |
554 | ||
555 | ts->hwmon = hwmon; | |
556 | return 0; | |
557 | } | |
558 | ||
559 | static void ads784x_hwmon_unregister(struct spi_device *spi, | |
560 | struct ads7846 *ts) | |
561 | { | |
562 | if (ts->hwmon) { | |
563 | sysfs_remove_group(&spi->dev.kobj, ts->attr_group); | |
564 | hwmon_device_unregister(ts->hwmon); | |
565 | } | |
566 | } | |
567 | ||
568 | #else | |
569 | static inline int ads784x_hwmon_register(struct spi_device *spi, | |
570 | struct ads7846 *ts) | |
571 | { | |
572 | return 0; | |
573 | } | |
574 | ||
575 | static inline void ads784x_hwmon_unregister(struct spi_device *spi, | |
576 | struct ads7846 *ts) | |
577 | { | |
578 | } | |
579 | #endif | |
ffa458c1 | 580 | |
438f2a74 ID |
581 | static ssize_t ads7846_pen_down_show(struct device *dev, |
582 | struct device_attribute *attr, char *buf) | |
583 | { | |
2991a1ca JW |
584 | struct ads7846 *ts = dev_get_drvdata(dev); |
585 | ||
586 | return sprintf(buf, "%u\n", ts->pendown); | |
438f2a74 ID |
587 | } |
588 | ||
589 | static DEVICE_ATTR(pen_down, S_IRUGO, ads7846_pen_down_show, NULL); | |
590 | ||
7de90a8c ID |
591 | static ssize_t ads7846_disable_show(struct device *dev, |
592 | struct device_attribute *attr, char *buf) | |
593 | { | |
2991a1ca | 594 | struct ads7846 *ts = dev_get_drvdata(dev); |
7de90a8c ID |
595 | |
596 | return sprintf(buf, "%u\n", ts->disabled); | |
597 | } | |
598 | ||
599 | static ssize_t ads7846_disable_store(struct device *dev, | |
600 | struct device_attribute *attr, | |
601 | const char *buf, size_t count) | |
602 | { | |
603 | struct ads7846 *ts = dev_get_drvdata(dev); | |
3a0c58dd | 604 | unsigned long i; |
160f1fef JR |
605 | |
606 | if (strict_strtoul(buf, 10, &i)) | |
607 | return -EINVAL; | |
7de90a8c | 608 | |
7de90a8c ID |
609 | if (i) |
610 | ads7846_disable(ts); | |
611 | else | |
612 | ads7846_enable(ts); | |
613 | ||
7de90a8c ID |
614 | return count; |
615 | } | |
616 | ||
617 | static DEVICE_ATTR(disable, 0664, ads7846_disable_show, ads7846_disable_store); | |
618 | ||
2c8dc071 | 619 | static struct attribute *ads784x_attributes[] = { |
8dd51650 DT |
620 | &dev_attr_pen_down.attr, |
621 | &dev_attr_disable.attr, | |
622 | NULL, | |
623 | }; | |
624 | ||
2c8dc071 DB |
625 | static struct attribute_group ads784x_attr_group = { |
626 | .attrs = ads784x_attributes, | |
8dd51650 DT |
627 | }; |
628 | ||
ffa458c1 DB |
629 | /*--------------------------------------------------------------------------*/ |
630 | ||
4d5975e5 EM |
631 | static int get_pendown_state(struct ads7846 *ts) |
632 | { | |
633 | if (ts->get_pendown_state) | |
634 | return ts->get_pendown_state(); | |
635 | ||
636 | return !gpio_get_value(ts->gpio_pendown); | |
637 | } | |
638 | ||
fd746d54 EM |
639 | static void null_wait_for_sync(void) |
640 | { | |
641 | } | |
642 | ||
2991a1ca JW |
643 | static int ads7846_debounce_filter(void *ads, int data_idx, int *val) |
644 | { | |
645 | struct ads7846 *ts = ads; | |
646 | ||
647 | if (!ts->read_cnt || (abs(ts->last_read - *val) > ts->debounce_tol)) { | |
648 | /* Start over collecting consistent readings. */ | |
649 | ts->read_rep = 0; | |
650 | /* | |
651 | * Repeat it, if this was the first read or the read | |
652 | * wasn't consistent enough. | |
653 | */ | |
654 | if (ts->read_cnt < ts->debounce_max) { | |
655 | ts->last_read = *val; | |
656 | ts->read_cnt++; | |
657 | return ADS7846_FILTER_REPEAT; | |
658 | } else { | |
659 | /* | |
660 | * Maximum number of debouncing reached and still | |
661 | * not enough number of consistent readings. Abort | |
662 | * the whole sample, repeat it in the next sampling | |
663 | * period. | |
664 | */ | |
665 | ts->read_cnt = 0; | |
666 | return ADS7846_FILTER_IGNORE; | |
667 | } | |
668 | } else { | |
669 | if (++ts->read_rep > ts->debounce_rep) { | |
670 | /* | |
671 | * Got a good reading for this coordinate, | |
672 | * go for the next one. | |
673 | */ | |
674 | ts->read_cnt = 0; | |
675 | ts->read_rep = 0; | |
676 | return ADS7846_FILTER_OK; | |
677 | } else { | |
678 | /* Read more values that are consistent. */ | |
679 | ts->read_cnt++; | |
680 | return ADS7846_FILTER_REPEAT; | |
681 | } | |
682 | } | |
683 | } | |
684 | ||
685 | static int ads7846_no_filter(void *ads, int data_idx, int *val) | |
686 | { | |
687 | return ADS7846_FILTER_OK; | |
688 | } | |
689 | ||
690 | static int ads7846_get_value(struct ads7846 *ts, struct spi_message *m) | |
691 | { | |
692 | struct spi_transfer *t = | |
693 | list_entry(m->transfers.prev, struct spi_transfer, transfer_list); | |
694 | ||
695 | if (ts->model == 7845) { | |
696 | return be16_to_cpup((__be16 *)&(((char*)t->rx_buf)[1])) >> 3; | |
697 | } else { | |
698 | /* | |
699 | * adjust: on-wire is a must-ignore bit, a BE12 value, then | |
700 | * padding; built from two 8 bit values written msb-first. | |
701 | */ | |
702 | return be16_to_cpup((__be16 *)t->rx_buf) >> 3; | |
703 | } | |
704 | } | |
705 | ||
706 | static void ads7846_update_value(struct spi_message *m, int val) | |
707 | { | |
708 | struct spi_transfer *t = | |
709 | list_entry(m->transfers.prev, struct spi_transfer, transfer_list); | |
710 | ||
711 | *(u16 *)t->rx_buf = val; | |
712 | } | |
713 | ||
714 | static void ads7846_read_state(struct ads7846 *ts) | |
715 | { | |
716 | struct ads7846_packet *packet = ts->packet; | |
717 | struct spi_message *m; | |
718 | int msg_idx = 0; | |
719 | int val; | |
720 | int action; | |
721 | int error; | |
722 | ||
723 | while (msg_idx < ts->msg_count) { | |
724 | ||
725 | ts->wait_for_sync(); | |
726 | ||
727 | m = &ts->msg[msg_idx]; | |
728 | error = spi_sync(ts->spi, m); | |
729 | if (error) { | |
730 | dev_err(&ts->spi->dev, "spi_async --> %d\n", error); | |
731 | packet->tc.ignore = true; | |
732 | return; | |
733 | } | |
734 | ||
735 | /* | |
736 | * Last message is power down request, no need to convert | |
737 | * or filter the value. | |
738 | */ | |
739 | if (msg_idx < ts->msg_count - 1) { | |
ffa458c1 | 740 | |
2991a1ca JW |
741 | val = ads7846_get_value(ts, m); |
742 | ||
743 | action = ts->filter(ts->filter_data, msg_idx, &val); | |
744 | switch (action) { | |
745 | case ADS7846_FILTER_REPEAT: | |
746 | continue; | |
747 | ||
748 | case ADS7846_FILTER_IGNORE: | |
749 | packet->tc.ignore = true; | |
750 | msg_idx = ts->msg_count - 1; | |
751 | continue; | |
752 | ||
753 | case ADS7846_FILTER_OK: | |
754 | ads7846_update_value(m, val); | |
755 | packet->tc.ignore = false; | |
756 | msg_idx++; | |
757 | break; | |
758 | ||
759 | default: | |
760 | BUG(); | |
761 | } | |
762 | } else { | |
763 | msg_idx++; | |
764 | } | |
765 | } | |
766 | } | |
767 | ||
768 | static void ads7846_report_state(struct ads7846 *ts) | |
ffa458c1 | 769 | { |
2991a1ca JW |
770 | struct ads7846_packet *packet = ts->packet; |
771 | unsigned int Rt; | |
772 | u16 x, y, z1, z2; | |
ffa458c1 | 773 | |
2991a1ca JW |
774 | /* |
775 | * ads7846_get_value() does in-place conversion (including byte swap) | |
776 | * from on-the-wire format as part of debouncing to get stable | |
777 | * readings. | |
ffa458c1 | 778 | */ |
3eac5c7e AG |
779 | if (ts->model == 7845) { |
780 | x = *(u16 *)packet->tc.x_buf; | |
781 | y = *(u16 *)packet->tc.y_buf; | |
782 | z1 = 0; | |
783 | z2 = 0; | |
784 | } else { | |
785 | x = packet->tc.x; | |
786 | y = packet->tc.y; | |
787 | z1 = packet->tc.z1; | |
788 | z2 = packet->tc.z2; | |
789 | } | |
ffa458c1 DB |
790 | |
791 | /* range filtering */ | |
792 | if (x == MAX_12BIT) | |
793 | x = 0; | |
794 | ||
9460b652 HCE |
795 | if (ts->model == 7843) { |
796 | Rt = ts->pressure_max / 2; | |
3eac5c7e AG |
797 | } else if (ts->model == 7845) { |
798 | if (get_pendown_state(ts)) | |
799 | Rt = ts->pressure_max / 2; | |
800 | else | |
801 | Rt = 0; | |
802 | dev_vdbg(&ts->spi->dev, "x/y: %d/%d, PD %d\n", x, y, Rt); | |
9460b652 | 803 | } else if (likely(x && z1)) { |
ffa458c1 DB |
804 | /* compute touch pressure resistance using equation #2 */ |
805 | Rt = z2; | |
806 | Rt -= z1; | |
807 | Rt *= x; | |
808 | Rt *= ts->x_plate_ohms; | |
809 | Rt /= z1; | |
810 | Rt = (Rt + 2047) >> 12; | |
9460b652 | 811 | } else { |
ffa458c1 | 812 | Rt = 0; |
9460b652 | 813 | } |
969111e9 | 814 | |
2991a1ca JW |
815 | /* |
816 | * Sample found inconsistent by debouncing or pressure is beyond | |
1936d590 ID |
817 | * the maximum. Don't report it to user space, repeat at least |
818 | * once more the measurement | |
819 | */ | |
e8f462d2 | 820 | if (packet->tc.ignore || Rt > ts->pressure_max) { |
52ce4eaa PM |
821 | dev_vdbg(&ts->spi->dev, "ignored %d pressure %d\n", |
822 | packet->tc.ignore, Rt); | |
d5b415c9 ID |
823 | return; |
824 | } | |
825 | ||
2991a1ca JW |
826 | /* |
827 | * Maybe check the pendown state before reporting. This discards | |
1d25891f SH |
828 | * false readings when the pen is lifted. |
829 | */ | |
830 | if (ts->penirq_recheck_delay_usecs) { | |
831 | udelay(ts->penirq_recheck_delay_usecs); | |
4d5975e5 | 832 | if (!get_pendown_state(ts)) |
1d25891f SH |
833 | Rt = 0; |
834 | } | |
835 | ||
2991a1ca JW |
836 | /* |
837 | * NOTE: We can't rely on the pressure to determine the pen down | |
838 | * state, even this controller has a pressure sensor. The pressure | |
15e3589e ID |
839 | * value can fluctuate for quite a while after lifting the pen and |
840 | * in some cases may not even settle at the expected value. | |
ffa458c1 | 841 | * |
15e3589e ID |
842 | * The only safe way to check for the pen up condition is in the |
843 | * timer by reading the pen signal state (it's a GPIO _and_ IRQ). | |
ffa458c1 | 844 | */ |
ffa458c1 | 845 | if (Rt) { |
15e3589e | 846 | struct input_dev *input = ts->input; |
ae82d5ab | 847 | |
2991a1ca JW |
848 | if (ts->swap_xy) |
849 | swap(x, y); | |
850 | ||
15e3589e ID |
851 | if (!ts->pendown) { |
852 | input_report_key(input, BTN_TOUCH, 1); | |
2991a1ca | 853 | ts->pendown = true; |
52ce4eaa | 854 | dev_vdbg(&ts->spi->dev, "DOWN\n"); |
15e3589e | 855 | } |
86579a4c | 856 | |
15e3589e ID |
857 | input_report_abs(input, ABS_X, x); |
858 | input_report_abs(input, ABS_Y, y); | |
30ad7ba0 | 859 | input_report_abs(input, ABS_PRESSURE, ts->pressure_max - Rt); |
ffa458c1 | 860 | |
15e3589e | 861 | input_sync(input); |
52ce4eaa | 862 | dev_vdbg(&ts->spi->dev, "%4d/%4d/%4d\n", x, y, Rt); |
15e3589e | 863 | } |
da970e69 ID |
864 | } |
865 | ||
2991a1ca | 866 | static irqreturn_t ads7846_hard_irq(int irq, void *handle) |
da970e69 | 867 | { |
2991a1ca | 868 | struct ads7846 *ts = handle; |
da970e69 | 869 | |
2991a1ca | 870 | return get_pendown_state(ts) ? IRQ_WAKE_THREAD : IRQ_HANDLED; |
0b7018aa ID |
871 | } |
872 | ||
0b7018aa | 873 | |
7d12e780 | 874 | static irqreturn_t ads7846_irq(int irq, void *handle) |
0b7018aa ID |
875 | { |
876 | struct ads7846 *ts = handle; | |
7de90a8c | 877 | |
2991a1ca JW |
878 | /* Start with a small delay before checking pendown state */ |
879 | msleep(TS_POLL_DELAY); | |
ffa458c1 | 880 | |
2991a1ca | 881 | while (!ts->stopped && get_pendown_state(ts)) { |
ffa458c1 | 882 | |
2991a1ca JW |
883 | /* pen is down, continue with the measurement */ |
884 | ads7846_read_state(ts); | |
ffa458c1 | 885 | |
2991a1ca JW |
886 | if (!ts->stopped) |
887 | ads7846_report_state(ts); | |
c9e617a5 | 888 | |
2991a1ca JW |
889 | wait_event_timeout(ts->wait, ts->stopped, |
890 | msecs_to_jiffies(TS_POLL_PERIOD)); | |
ffa458c1 DB |
891 | } |
892 | ||
2991a1ca JW |
893 | if (ts->pendown) { |
894 | struct input_dev *input = ts->input; | |
7de90a8c | 895 | |
2991a1ca JW |
896 | input_report_key(input, BTN_TOUCH, 0); |
897 | input_report_abs(input, ABS_PRESSURE, 0); | |
898 | input_sync(input); | |
7de90a8c | 899 | |
2991a1ca JW |
900 | ts->pendown = false; |
901 | dev_vdbg(&ts->spi->dev, "UP\n"); | |
902 | } | |
91143379 | 903 | |
2991a1ca | 904 | return IRQ_HANDLED; |
7de90a8c ID |
905 | } |
906 | ||
3c36e719 MB |
907 | #ifdef CONFIG_PM_SLEEP |
908 | static int ads7846_suspend(struct device *dev) | |
7de90a8c | 909 | { |
3c36e719 | 910 | struct ads7846 *ts = dev_get_drvdata(dev); |
7de90a8c | 911 | |
2991a1ca | 912 | mutex_lock(&ts->lock); |
7de90a8c | 913 | |
2991a1ca | 914 | if (!ts->suspended) { |
7de90a8c | 915 | |
2991a1ca JW |
916 | if (!ts->disabled) |
917 | __ads7846_disable(ts); | |
7de90a8c | 918 | |
2991a1ca JW |
919 | if (device_may_wakeup(&ts->spi->dev)) |
920 | enable_irq_wake(ts->spi->irq); | |
fdba2bb1 | 921 | |
2991a1ca JW |
922 | ts->suspended = true; |
923 | } | |
924 | ||
925 | mutex_unlock(&ts->lock); | |
7de90a8c | 926 | |
2991a1ca | 927 | return 0; |
ffa458c1 DB |
928 | } |
929 | ||
3c36e719 | 930 | static int ads7846_resume(struct device *dev) |
ffa458c1 | 931 | { |
3c36e719 | 932 | struct ads7846 *ts = dev_get_drvdata(dev); |
ffa458c1 | 933 | |
2991a1ca JW |
934 | mutex_lock(&ts->lock); |
935 | ||
936 | if (ts->suspended) { | |
fdba2bb1 | 937 | |
2991a1ca | 938 | ts->suspended = false; |
7de90a8c | 939 | |
2991a1ca JW |
940 | if (device_may_wakeup(&ts->spi->dev)) |
941 | disable_irq_wake(ts->spi->irq); | |
7de90a8c | 942 | |
2991a1ca JW |
943 | if (!ts->disabled) |
944 | __ads7846_enable(ts); | |
945 | } | |
946 | ||
947 | mutex_unlock(&ts->lock); | |
7de90a8c | 948 | |
ffa458c1 DB |
949 | return 0; |
950 | } | |
3c36e719 MB |
951 | #endif |
952 | ||
953 | static SIMPLE_DEV_PM_OPS(ads7846_pm, ads7846_suspend, ads7846_resume); | |
ffa458c1 | 954 | |
2991a1ca | 955 | static int __devinit ads7846_setup_pendown(struct spi_device *spi, struct ads7846 *ts) |
4d5975e5 EM |
956 | { |
957 | struct ads7846_platform_data *pdata = spi->dev.platform_data; | |
958 | int err; | |
959 | ||
0fbc9fdb DT |
960 | /* |
961 | * REVISIT when the irq can be triggered active-low, or if for some | |
4d5975e5 EM |
962 | * reason the touchscreen isn't hooked up, we don't need to access |
963 | * the pendown state. | |
964 | */ | |
4d5975e5 EM |
965 | |
966 | if (pdata->get_pendown_state) { | |
967 | ts->get_pendown_state = pdata->get_pendown_state; | |
0fbc9fdb | 968 | } else if (gpio_is_valid(pdata->gpio_pendown)) { |
4d5975e5 | 969 | |
58c24400 IG |
970 | err = gpio_request_one(pdata->gpio_pendown, GPIOF_IN, |
971 | "ads7846_pendown"); | |
0fbc9fdb | 972 | if (err) { |
58c24400 IG |
973 | dev_err(&spi->dev, |
974 | "failed to request/setup pendown GPIO%d: %d\n", | |
975 | pdata->gpio_pendown, err); | |
1201e7e6 IG |
976 | return err; |
977 | } | |
4d5975e5 | 978 | |
0fbc9fdb DT |
979 | ts->gpio_pendown = pdata->gpio_pendown; |
980 | ||
981 | } else { | |
982 | dev_err(&spi->dev, "no get_pendown_state nor gpio_pendown?\n"); | |
983 | return -EINVAL; | |
984 | } | |
2991a1ca | 985 | |
4d5975e5 EM |
986 | return 0; |
987 | } | |
988 | ||
2991a1ca JW |
989 | /* |
990 | * Set up the transfers to read touchscreen state; this assumes we | |
991 | * use formula #2 for pressure, not #3. | |
992 | */ | |
993 | static void __devinit ads7846_setup_spi_msg(struct ads7846 *ts, | |
994 | const struct ads7846_platform_data *pdata) | |
ffa458c1 | 995 | { |
2991a1ca JW |
996 | struct spi_message *m = &ts->msg[0]; |
997 | struct spi_transfer *x = ts->xfer; | |
998 | struct ads7846_packet *packet = ts->packet; | |
999 | int vref = pdata->keep_vref_on; | |
de2defd9 | 1000 | |
06a09124 | 1001 | if (ts->model == 7873) { |
2991a1ca JW |
1002 | /* |
1003 | * The AD7873 is almost identical to the ADS7846 | |
06a09124 | 1004 | * keep VREF off during differential/ratiometric |
2991a1ca | 1005 | * conversion modes. |
06a09124 MH |
1006 | */ |
1007 | ts->model = 7846; | |
1008 | vref = 0; | |
1009 | } | |
1010 | ||
2991a1ca | 1011 | ts->msg_count = 1; |
0b7018aa | 1012 | spi_message_init(m); |
2991a1ca | 1013 | m->context = ts; |
0b7018aa | 1014 | |
3eac5c7e AG |
1015 | if (ts->model == 7845) { |
1016 | packet->read_y_cmd[0] = READ_Y(vref); | |
1017 | packet->read_y_cmd[1] = 0; | |
1018 | packet->read_y_cmd[2] = 0; | |
1019 | x->tx_buf = &packet->read_y_cmd[0]; | |
1020 | x->rx_buf = &packet->tc.y_buf[0]; | |
1021 | x->len = 3; | |
1022 | spi_message_add_tail(x, m); | |
1023 | } else { | |
1024 | /* y- still on; turn on only y+ (and ADC) */ | |
1025 | packet->read_y = READ_Y(vref); | |
1026 | x->tx_buf = &packet->read_y; | |
1027 | x->len = 1; | |
1028 | spi_message_add_tail(x, m); | |
d93f70b2 | 1029 | |
3eac5c7e AG |
1030 | x++; |
1031 | x->rx_buf = &packet->tc.y; | |
1032 | x->len = 2; | |
1033 | spi_message_add_tail(x, m); | |
1034 | } | |
0b7018aa | 1035 | |
2991a1ca JW |
1036 | /* |
1037 | * The first sample after switching drivers can be low quality; | |
e4f48861 SH |
1038 | * optionally discard it, using a second one after the signals |
1039 | * have had enough time to stabilize. | |
1040 | */ | |
1041 | if (pdata->settle_delay_usecs) { | |
1042 | x->delay_usecs = pdata->settle_delay_usecs; | |
1043 | ||
1044 | x++; | |
e8f462d2 | 1045 | x->tx_buf = &packet->read_y; |
e4f48861 SH |
1046 | x->len = 1; |
1047 | spi_message_add_tail(x, m); | |
1048 | ||
1049 | x++; | |
e8f462d2 | 1050 | x->rx_buf = &packet->tc.y; |
e4f48861 SH |
1051 | x->len = 2; |
1052 | spi_message_add_tail(x, m); | |
1053 | } | |
1054 | ||
2991a1ca | 1055 | ts->msg_count++; |
0b7018aa ID |
1056 | m++; |
1057 | spi_message_init(m); | |
2991a1ca | 1058 | m->context = ts; |
0b7018aa | 1059 | |
3eac5c7e AG |
1060 | if (ts->model == 7845) { |
1061 | x++; | |
1062 | packet->read_x_cmd[0] = READ_X(vref); | |
1063 | packet->read_x_cmd[1] = 0; | |
1064 | packet->read_x_cmd[2] = 0; | |
1065 | x->tx_buf = &packet->read_x_cmd[0]; | |
1066 | x->rx_buf = &packet->tc.x_buf[0]; | |
1067 | x->len = 3; | |
1068 | spi_message_add_tail(x, m); | |
1069 | } else { | |
1070 | /* turn y- off, x+ on, then leave in lowpower */ | |
1071 | x++; | |
1072 | packet->read_x = READ_X(vref); | |
1073 | x->tx_buf = &packet->read_x; | |
1074 | x->len = 1; | |
1075 | spi_message_add_tail(x, m); | |
0b7018aa | 1076 | |
3eac5c7e AG |
1077 | x++; |
1078 | x->rx_buf = &packet->tc.x; | |
1079 | x->len = 2; | |
1080 | spi_message_add_tail(x, m); | |
1081 | } | |
0b7018aa | 1082 | |
e4f48861 SH |
1083 | /* ... maybe discard first sample ... */ |
1084 | if (pdata->settle_delay_usecs) { | |
1085 | x->delay_usecs = pdata->settle_delay_usecs; | |
1086 | ||
1087 | x++; | |
e8f462d2 | 1088 | x->tx_buf = &packet->read_x; |
e4f48861 SH |
1089 | x->len = 1; |
1090 | spi_message_add_tail(x, m); | |
1091 | ||
1092 | x++; | |
e8f462d2 | 1093 | x->rx_buf = &packet->tc.x; |
e4f48861 SH |
1094 | x->len = 2; |
1095 | spi_message_add_tail(x, m); | |
1096 | } | |
1097 | ||
ffa458c1 DB |
1098 | /* turn y+ off, x- on; we'll use formula #2 */ |
1099 | if (ts->model == 7846) { | |
2991a1ca | 1100 | ts->msg_count++; |
0b7018aa ID |
1101 | m++; |
1102 | spi_message_init(m); | |
2991a1ca | 1103 | m->context = ts; |
0b7018aa | 1104 | |
d93f70b2 | 1105 | x++; |
e8f462d2 DT |
1106 | packet->read_z1 = READ_Z1(vref); |
1107 | x->tx_buf = &packet->read_z1; | |
ffa458c1 | 1108 | x->len = 1; |
0b7018aa | 1109 | spi_message_add_tail(x, m); |
d93f70b2 | 1110 | |
ffa458c1 | 1111 | x++; |
e8f462d2 | 1112 | x->rx_buf = &packet->tc.z1; |
ffa458c1 | 1113 | x->len = 2; |
0b7018aa ID |
1114 | spi_message_add_tail(x, m); |
1115 | ||
e4f48861 SH |
1116 | /* ... maybe discard first sample ... */ |
1117 | if (pdata->settle_delay_usecs) { | |
1118 | x->delay_usecs = pdata->settle_delay_usecs; | |
1119 | ||
1120 | x++; | |
e8f462d2 | 1121 | x->tx_buf = &packet->read_z1; |
e4f48861 SH |
1122 | x->len = 1; |
1123 | spi_message_add_tail(x, m); | |
1124 | ||
1125 | x++; | |
e8f462d2 | 1126 | x->rx_buf = &packet->tc.z1; |
e4f48861 SH |
1127 | x->len = 2; |
1128 | spi_message_add_tail(x, m); | |
1129 | } | |
1130 | ||
2991a1ca | 1131 | ts->msg_count++; |
0b7018aa ID |
1132 | m++; |
1133 | spi_message_init(m); | |
2991a1ca | 1134 | m->context = ts; |
ffa458c1 | 1135 | |
d93f70b2 | 1136 | x++; |
e8f462d2 DT |
1137 | packet->read_z2 = READ_Z2(vref); |
1138 | x->tx_buf = &packet->read_z2; | |
ffa458c1 | 1139 | x->len = 1; |
0b7018aa | 1140 | spi_message_add_tail(x, m); |
d93f70b2 | 1141 | |
ffa458c1 | 1142 | x++; |
e8f462d2 | 1143 | x->rx_buf = &packet->tc.z2; |
ffa458c1 | 1144 | x->len = 2; |
0b7018aa | 1145 | spi_message_add_tail(x, m); |
ffa458c1 | 1146 | |
e4f48861 SH |
1147 | /* ... maybe discard first sample ... */ |
1148 | if (pdata->settle_delay_usecs) { | |
1149 | x->delay_usecs = pdata->settle_delay_usecs; | |
1150 | ||
1151 | x++; | |
e8f462d2 | 1152 | x->tx_buf = &packet->read_z2; |
e4f48861 SH |
1153 | x->len = 1; |
1154 | spi_message_add_tail(x, m); | |
1155 | ||
1156 | x++; | |
e8f462d2 | 1157 | x->rx_buf = &packet->tc.z2; |
e4f48861 SH |
1158 | x->len = 2; |
1159 | spi_message_add_tail(x, m); | |
1160 | } | |
0b7018aa | 1161 | } |
53a0ef89 ID |
1162 | |
1163 | /* power down */ | |
2991a1ca | 1164 | ts->msg_count++; |
0b7018aa ID |
1165 | m++; |
1166 | spi_message_init(m); | |
2991a1ca | 1167 | m->context = ts; |
0b7018aa | 1168 | |
3eac5c7e AG |
1169 | if (ts->model == 7845) { |
1170 | x++; | |
1171 | packet->pwrdown_cmd[0] = PWRDOWN; | |
1172 | packet->pwrdown_cmd[1] = 0; | |
1173 | packet->pwrdown_cmd[2] = 0; | |
1174 | x->tx_buf = &packet->pwrdown_cmd[0]; | |
1175 | x->len = 3; | |
1176 | } else { | |
1177 | x++; | |
1178 | packet->pwrdown = PWRDOWN; | |
1179 | x->tx_buf = &packet->pwrdown; | |
1180 | x->len = 1; | |
1181 | spi_message_add_tail(x, m); | |
1182 | ||
1183 | x++; | |
1184 | x->rx_buf = &packet->dummy; | |
1185 | x->len = 2; | |
1186 | } | |
53a0ef89 | 1187 | |
d93f70b2 | 1188 | CS_CHANGE(*x); |
0b7018aa | 1189 | spi_message_add_tail(x, m); |
2991a1ca | 1190 | } |
ffa458c1 | 1191 | |
2991a1ca JW |
1192 | static int __devinit ads7846_probe(struct spi_device *spi) |
1193 | { | |
1194 | struct ads7846 *ts; | |
1195 | struct ads7846_packet *packet; | |
1196 | struct input_dev *input_dev; | |
1197 | struct ads7846_platform_data *pdata = spi->dev.platform_data; | |
1198 | unsigned long irq_flags; | |
1199 | int err; | |
1200 | ||
1201 | if (!spi->irq) { | |
1202 | dev_dbg(&spi->dev, "no IRQ?\n"); | |
1203 | return -ENODEV; | |
1204 | } | |
1205 | ||
1206 | if (!pdata) { | |
1207 | dev_dbg(&spi->dev, "no platform data?\n"); | |
1208 | return -ENODEV; | |
1209 | } | |
1210 | ||
1211 | /* don't exceed max specified sample rate */ | |
1212 | if (spi->max_speed_hz > (125000 * SAMPLE_BITS)) { | |
1213 | dev_dbg(&spi->dev, "f(sample) %d KHz?\n", | |
1214 | (spi->max_speed_hz/SAMPLE_BITS)/1000); | |
1215 | return -EINVAL; | |
1216 | } | |
1217 | ||
1218 | /* We'd set TX word size 8 bits and RX word size to 13 bits ... except | |
1219 | * that even if the hardware can do that, the SPI controller driver | |
1220 | * may not. So we stick to very-portable 8 bit words, both RX and TX. | |
1221 | */ | |
1222 | spi->bits_per_word = 8; | |
1223 | spi->mode = SPI_MODE_0; | |
1224 | err = spi_setup(spi); | |
1225 | if (err < 0) | |
1226 | return err; | |
ffa458c1 | 1227 | |
2991a1ca JW |
1228 | ts = kzalloc(sizeof(struct ads7846), GFP_KERNEL); |
1229 | packet = kzalloc(sizeof(struct ads7846_packet), GFP_KERNEL); | |
1230 | input_dev = input_allocate_device(); | |
1231 | if (!ts || !packet || !input_dev) { | |
1232 | err = -ENOMEM; | |
1233 | goto err_free_mem; | |
1234 | } | |
1235 | ||
1236 | dev_set_drvdata(&spi->dev, ts); | |
1237 | ||
1238 | ts->packet = packet; | |
1239 | ts->spi = spi; | |
1240 | ts->input = input_dev; | |
1241 | ts->vref_mv = pdata->vref_mv; | |
1242 | ts->swap_xy = pdata->swap_xy; | |
1243 | ||
1244 | mutex_init(&ts->lock); | |
1245 | init_waitqueue_head(&ts->wait); | |
1246 | ||
1247 | ts->model = pdata->model ? : 7846; | |
1248 | ts->vref_delay_usecs = pdata->vref_delay_usecs ? : 100; | |
1249 | ts->x_plate_ohms = pdata->x_plate_ohms ? : 400; | |
1250 | ts->pressure_max = pdata->pressure_max ? : ~0; | |
1251 | ||
1252 | if (pdata->filter != NULL) { | |
1253 | if (pdata->filter_init != NULL) { | |
1254 | err = pdata->filter_init(pdata, &ts->filter_data); | |
1255 | if (err < 0) | |
1256 | goto err_free_mem; | |
1257 | } | |
1258 | ts->filter = pdata->filter; | |
1259 | ts->filter_cleanup = pdata->filter_cleanup; | |
1260 | } else if (pdata->debounce_max) { | |
1261 | ts->debounce_max = pdata->debounce_max; | |
1262 | if (ts->debounce_max < 2) | |
1263 | ts->debounce_max = 2; | |
1264 | ts->debounce_tol = pdata->debounce_tol; | |
1265 | ts->debounce_rep = pdata->debounce_rep; | |
1266 | ts->filter = ads7846_debounce_filter; | |
1267 | ts->filter_data = ts; | |
1268 | } else { | |
1269 | ts->filter = ads7846_no_filter; | |
1270 | } | |
1271 | ||
1272 | err = ads7846_setup_pendown(spi, ts); | |
1273 | if (err) | |
1274 | goto err_cleanup_filter; | |
1275 | ||
1276 | if (pdata->penirq_recheck_delay_usecs) | |
1277 | ts->penirq_recheck_delay_usecs = | |
1278 | pdata->penirq_recheck_delay_usecs; | |
1279 | ||
1280 | ts->wait_for_sync = pdata->wait_for_sync ? : null_wait_for_sync; | |
1281 | ||
1282 | snprintf(ts->phys, sizeof(ts->phys), "%s/input0", dev_name(&spi->dev)); | |
1283 | snprintf(ts->name, sizeof(ts->name), "ADS%d Touchscreen", ts->model); | |
1284 | ||
1285 | input_dev->name = ts->name; | |
1286 | input_dev->phys = ts->phys; | |
1287 | input_dev->dev.parent = &spi->dev; | |
1288 | ||
1289 | input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS); | |
1290 | input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH); | |
1291 | input_set_abs_params(input_dev, ABS_X, | |
1292 | pdata->x_min ? : 0, | |
1293 | pdata->x_max ? : MAX_12BIT, | |
1294 | 0, 0); | |
1295 | input_set_abs_params(input_dev, ABS_Y, | |
1296 | pdata->y_min ? : 0, | |
1297 | pdata->y_max ? : MAX_12BIT, | |
1298 | 0, 0); | |
1299 | input_set_abs_params(input_dev, ABS_PRESSURE, | |
1300 | pdata->pressure_min, pdata->pressure_max, 0, 0); | |
1301 | ||
1302 | ads7846_setup_spi_msg(ts, pdata); | |
d5b415c9 | 1303 | |
91143379 GI |
1304 | ts->reg = regulator_get(&spi->dev, "vcc"); |
1305 | if (IS_ERR(ts->reg)) { | |
067fb2f6 | 1306 | err = PTR_ERR(ts->reg); |
56960b36 | 1307 | dev_err(&spi->dev, "unable to get regulator: %d\n", err); |
91143379 GI |
1308 | goto err_free_gpio; |
1309 | } | |
1310 | ||
1311 | err = regulator_enable(ts->reg); | |
1312 | if (err) { | |
1313 | dev_err(&spi->dev, "unable to enable regulator: %d\n", err); | |
1314 | goto err_put_regulator; | |
1315 | } | |
1316 | ||
0f622bf4 | 1317 | irq_flags = pdata->irq_flags ? : IRQF_TRIGGER_FALLING; |
2991a1ca | 1318 | irq_flags |= IRQF_ONESHOT; |
7804302b | 1319 | |
2991a1ca JW |
1320 | err = request_threaded_irq(spi->irq, ads7846_hard_irq, ads7846_irq, |
1321 | irq_flags, spi->dev.driver->name, ts); | |
0f622bf4 | 1322 | if (err && !pdata->irq_flags) { |
c57c0a2a MR |
1323 | dev_info(&spi->dev, |
1324 | "trying pin change workaround on irq %d\n", spi->irq); | |
2991a1ca JW |
1325 | irq_flags |= IRQF_TRIGGER_RISING; |
1326 | err = request_threaded_irq(spi->irq, | |
1327 | ads7846_hard_irq, ads7846_irq, | |
1328 | irq_flags, spi->dev.driver->name, ts); | |
0f622bf4 DT |
1329 | } |
1330 | ||
1331 | if (err) { | |
1332 | dev_dbg(&spi->dev, "irq %d busy?\n", spi->irq); | |
1333 | goto err_disable_regulator; | |
ffa458c1 | 1334 | } |
ffa458c1 | 1335 | |
2c8dc071 DB |
1336 | err = ads784x_hwmon_register(spi, ts); |
1337 | if (err) | |
1338 | goto err_free_irq; | |
1339 | ||
2e5a7bd9 | 1340 | dev_info(&spi->dev, "touchscreen, irq %d\n", spi->irq); |
ffa458c1 | 1341 | |
2991a1ca JW |
1342 | /* |
1343 | * Take a first sample, leaving nPENIRQ active and vREF off; avoid | |
ffa458c1 DB |
1344 | * the touchscreen, in case it's not connected. |
1345 | */ | |
3eac5c7e AG |
1346 | if (ts->model == 7845) |
1347 | ads7845_read12_ser(&spi->dev, PWRDOWN); | |
1348 | else | |
ebcaaad9 | 1349 | (void) ads7846_read12_ser(&spi->dev, READ_12BIT_SER(vaux)); |
ffa458c1 | 1350 | |
2c8dc071 | 1351 | err = sysfs_create_group(&spi->dev.kobj, &ads784x_attr_group); |
8dd51650 | 1352 | if (err) |
2c8dc071 | 1353 | goto err_remove_hwmon; |
7de90a8c | 1354 | |
a90f7e98 DT |
1355 | err = input_register_device(input_dev); |
1356 | if (err) | |
8dd51650 | 1357 | goto err_remove_attr_group; |
a90f7e98 | 1358 | |
fdba2bb1 RL |
1359 | device_init_wakeup(&spi->dev, pdata->wakeup); |
1360 | ||
ffa458c1 | 1361 | return 0; |
a90f7e98 | 1362 | |
8dd51650 | 1363 | err_remove_attr_group: |
2c8dc071 DB |
1364 | sysfs_remove_group(&spi->dev.kobj, &ads784x_attr_group); |
1365 | err_remove_hwmon: | |
1366 | ads784x_hwmon_unregister(spi, ts); | |
8dd51650 | 1367 | err_free_irq: |
a90f7e98 | 1368 | free_irq(spi->irq, ts); |
91143379 GI |
1369 | err_disable_regulator: |
1370 | regulator_disable(ts->reg); | |
1371 | err_put_regulator: | |
1372 | regulator_put(ts->reg); | |
4d5975e5 | 1373 | err_free_gpio: |
0fbc9fdb | 1374 | if (!ts->get_pendown_state) |
4d5975e5 | 1375 | gpio_free(ts->gpio_pendown); |
da970e69 ID |
1376 | err_cleanup_filter: |
1377 | if (ts->filter_cleanup) | |
1378 | ts->filter_cleanup(ts->filter_data); | |
a90f7e98 DT |
1379 | err_free_mem: |
1380 | input_free_device(input_dev); | |
e8f462d2 | 1381 | kfree(packet); |
a90f7e98 DT |
1382 | kfree(ts); |
1383 | return err; | |
ffa458c1 DB |
1384 | } |
1385 | ||
2e5a7bd9 | 1386 | static int __devexit ads7846_remove(struct spi_device *spi) |
ffa458c1 | 1387 | { |
2991a1ca | 1388 | struct ads7846 *ts = dev_get_drvdata(&spi->dev); |
ffa458c1 | 1389 | |
fdba2bb1 RL |
1390 | device_init_wakeup(&spi->dev, false); |
1391 | ||
2c8dc071 | 1392 | sysfs_remove_group(&spi->dev.kobj, &ads784x_attr_group); |
ffa458c1 | 1393 | |
2991a1ca | 1394 | ads7846_disable(ts); |
7de90a8c | 1395 | free_irq(ts->spi->irq, ts); |
2991a1ca JW |
1396 | |
1397 | input_unregister_device(ts->input); | |
1398 | ||
1399 | ads784x_hwmon_unregister(spi, ts); | |
7de90a8c | 1400 | |
91143379 GI |
1401 | regulator_disable(ts->reg); |
1402 | regulator_put(ts->reg); | |
1403 | ||
0fbc9fdb DT |
1404 | if (!ts->get_pendown_state) { |
1405 | /* | |
1406 | * If we are not using specialized pendown method we must | |
1407 | * have been relying on gpio we set up ourselves. | |
1408 | */ | |
4d5975e5 | 1409 | gpio_free(ts->gpio_pendown); |
0fbc9fdb | 1410 | } |
4d5975e5 | 1411 | |
da970e69 ID |
1412 | if (ts->filter_cleanup) |
1413 | ts->filter_cleanup(ts->filter_data); | |
1414 | ||
e8f462d2 | 1415 | kfree(ts->packet); |
ffa458c1 DB |
1416 | kfree(ts); |
1417 | ||
2e5a7bd9 | 1418 | dev_dbg(&spi->dev, "unregistered touchscreen\n"); |
2991a1ca | 1419 | |
ffa458c1 DB |
1420 | return 0; |
1421 | } | |
1422 | ||
2e5a7bd9 DB |
1423 | static struct spi_driver ads7846_driver = { |
1424 | .driver = { | |
1425 | .name = "ads7846", | |
1426 | .bus = &spi_bus_type, | |
1427 | .owner = THIS_MODULE, | |
3c36e719 | 1428 | .pm = &ads7846_pm, |
2e5a7bd9 | 1429 | }, |
ffa458c1 | 1430 | .probe = ads7846_probe, |
2e5a7bd9 | 1431 | .remove = __devexit_p(ads7846_remove), |
ffa458c1 DB |
1432 | }; |
1433 | ||
1434 | static int __init ads7846_init(void) | |
1435 | { | |
2e5a7bd9 | 1436 | return spi_register_driver(&ads7846_driver); |
ffa458c1 DB |
1437 | } |
1438 | module_init(ads7846_init); | |
1439 | ||
1440 | static void __exit ads7846_exit(void) | |
1441 | { | |
2e5a7bd9 | 1442 | spi_unregister_driver(&ads7846_driver); |
ffa458c1 DB |
1443 | } |
1444 | module_exit(ads7846_exit); | |
1445 | ||
1446 | MODULE_DESCRIPTION("ADS7846 TouchScreen Driver"); | |
1447 | MODULE_LICENSE("GPL"); | |
e0626e38 | 1448 | MODULE_ALIAS("spi:ads7846"); |