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> |
a608026e DM |
30 | #include <linux/of.h> |
31 | #include <linux/of_gpio.h> | |
32 | #include <linux/of_device.h> | |
4d5975e5 | 33 | #include <linux/gpio.h> |
ffa458c1 DB |
34 | #include <linux/spi/spi.h> |
35 | #include <linux/spi/ads7846.h> | |
91143379 | 36 | #include <linux/regulator/consumer.h> |
d2d8442d | 37 | #include <linux/module.h> |
3ac8bf07 | 38 | #include <asm/irq.h> |
ffa458c1 | 39 | |
ffa458c1 | 40 | /* |
9084533e | 41 | * This code has been heavily tested on a Nokia 770, and lightly |
52ce4eaa | 42 | * tested on other ads7846 devices (OSK/Mistral, Lubbock, Spitz). |
bff0de5f | 43 | * TSC2046 is just newer ads7846 silicon. |
969111e9 NF |
44 | * Support for ads7843 tested on Atmel at91sam926x-EK. |
45 | * Support for ads7845 has only been stubbed in. | |
06a09124 | 46 | * Support for Analog Devices AD7873 and AD7843 tested. |
ffa458c1 | 47 | * |
7de90a8c ID |
48 | * IRQ handling needs a workaround because of a shortcoming in handling |
49 | * edge triggered IRQs on some platforms like the OMAP1/2. These | |
50 | * platforms don't handle the ARM lazy IRQ disabling properly, thus we | |
51 | * have to maintain our own SW IRQ disabled status. This should be | |
52 | * removed as soon as the affected platform's IRQ handling is fixed. | |
53 | * | |
52ce4eaa | 54 | * App note sbaa036 talks in more detail about accurate sampling... |
ffa458c1 DB |
55 | * that ought to help in situations like LCDs inducing noise (which |
56 | * can also be helped by using synch signals) and more generally. | |
7de90a8c ID |
57 | * This driver tries to utilize the measures described in the app |
58 | * note. The strength of filtering can be set in the board-* specific | |
59 | * files. | |
ffa458c1 DB |
60 | */ |
61 | ||
2991a1ca JW |
62 | #define TS_POLL_DELAY 1 /* ms delay before the first sample */ |
63 | #define TS_POLL_PERIOD 5 /* ms delay between samples */ | |
ffa458c1 | 64 | |
d93f70b2 DB |
65 | /* this driver doesn't aim at the peak continuous sample rate */ |
66 | #define SAMPLE_BITS (8 /*cmd*/ + 16 /*sample*/ + 2 /* before, after */) | |
67 | ||
ffa458c1 | 68 | struct ts_event { |
2991a1ca JW |
69 | /* |
70 | * For portability, we can't read 12 bit values using SPI (which | |
71 | * would make the controller deliver them as native byte order u16 | |
d93f70b2 | 72 | * with msbs zeroed). Instead, we read them as two 8-bit values, |
da970e69 | 73 | * *** WHICH NEED BYTESWAPPING *** and range adjustment. |
ffa458c1 | 74 | */ |
da970e69 ID |
75 | u16 x; |
76 | u16 y; | |
77 | u16 z1, z2; | |
2991a1ca | 78 | bool ignore; |
3eac5c7e AG |
79 | u8 x_buf[3]; |
80 | u8 y_buf[3]; | |
ffa458c1 DB |
81 | }; |
82 | ||
e8f462d2 DT |
83 | /* |
84 | * We allocate this separately to avoid cache line sharing issues when | |
85 | * driver is used with DMA-based SPI controllers (like atmel_spi) on | |
86 | * systems where main memory is not DMA-coherent (most non-x86 boards). | |
87 | */ | |
88 | struct ads7846_packet { | |
89 | u8 read_x, read_y, read_z1, read_z2, pwrdown; | |
90 | u16 dummy; /* for the pwrdown read */ | |
91 | struct ts_event tc; | |
3eac5c7e AG |
92 | /* for ads7845 with mpc5121 psc spi we use 3-byte buffers */ |
93 | u8 read_x_cmd[3], read_y_cmd[3], pwrdown_cmd[3]; | |
e8f462d2 DT |
94 | }; |
95 | ||
ffa458c1 | 96 | struct ads7846 { |
a90f7e98 | 97 | struct input_dev *input; |
ffa458c1 | 98 | char phys[32]; |
b58895f8 | 99 | char name[32]; |
ffa458c1 DB |
100 | |
101 | struct spi_device *spi; | |
91143379 | 102 | struct regulator *reg; |
2c8dc071 DB |
103 | |
104 | #if defined(CONFIG_HWMON) || defined(CONFIG_HWMON_MODULE) | |
8dd51650 | 105 | struct attribute_group *attr_group; |
1beeffe4 | 106 | struct device *hwmon; |
2c8dc071 DB |
107 | #endif |
108 | ||
ffa458c1 | 109 | u16 model; |
7c6d0ee1 | 110 | u16 vref_mv; |
ffa458c1 DB |
111 | u16 vref_delay_usecs; |
112 | u16 x_plate_ohms; | |
d5b415c9 | 113 | u16 pressure_max; |
ffa458c1 | 114 | |
86579a4c | 115 | bool swap_xy; |
ebcaaad9 | 116 | bool use_internal; |
86579a4c | 117 | |
e8f462d2 | 118 | struct ads7846_packet *packet; |
ffa458c1 | 119 | |
e4f48861 | 120 | struct spi_transfer xfer[18]; |
0b7018aa | 121 | struct spi_message msg[5]; |
2991a1ca JW |
122 | int msg_count; |
123 | wait_queue_head_t wait; | |
124 | ||
125 | bool pendown; | |
126 | ||
0b7018aa | 127 | int read_cnt; |
d5b415c9 | 128 | int read_rep; |
0b7018aa ID |
129 | int last_read; |
130 | ||
131 | u16 debounce_max; | |
132 | u16 debounce_tol; | |
d5b415c9 | 133 | u16 debounce_rep; |
ffa458c1 | 134 | |
1d25891f SH |
135 | u16 penirq_recheck_delay_usecs; |
136 | ||
2991a1ca JW |
137 | struct mutex lock; |
138 | bool stopped; /* P: lock */ | |
139 | bool disabled; /* P: lock */ | |
140 | bool suspended; /* P: lock */ | |
c9e617a5 | 141 | |
da970e69 ID |
142 | int (*filter)(void *data, int data_idx, int *val); |
143 | void *filter_data; | |
144 | void (*filter_cleanup)(void *data); | |
c9e617a5 | 145 | int (*get_pendown_state)(void); |
4d5975e5 | 146 | int gpio_pendown; |
fd746d54 EM |
147 | |
148 | void (*wait_for_sync)(void); | |
ffa458c1 DB |
149 | }; |
150 | ||
151 | /* leave chip selected when we're done, for quicker re-select? */ | |
152 | #if 0 | |
153 | #define CS_CHANGE(xfer) ((xfer).cs_change = 1) | |
154 | #else | |
155 | #define CS_CHANGE(xfer) ((xfer).cs_change = 0) | |
156 | #endif | |
157 | ||
158 | /*--------------------------------------------------------------------------*/ | |
159 | ||
160 | /* The ADS7846 has touchscreen and other sensors. | |
161 | * Earlier ads784x chips are somewhat compatible. | |
162 | */ | |
163 | #define ADS_START (1 << 7) | |
164 | #define ADS_A2A1A0_d_y (1 << 4) /* differential */ | |
165 | #define ADS_A2A1A0_d_z1 (3 << 4) /* differential */ | |
166 | #define ADS_A2A1A0_d_z2 (4 << 4) /* differential */ | |
167 | #define ADS_A2A1A0_d_x (5 << 4) /* differential */ | |
168 | #define ADS_A2A1A0_temp0 (0 << 4) /* non-differential */ | |
169 | #define ADS_A2A1A0_vbatt (2 << 4) /* non-differential */ | |
170 | #define ADS_A2A1A0_vaux (6 << 4) /* non-differential */ | |
171 | #define ADS_A2A1A0_temp1 (7 << 4) /* non-differential */ | |
172 | #define ADS_8_BIT (1 << 3) | |
173 | #define ADS_12_BIT (0 << 3) | |
174 | #define ADS_SER (1 << 2) /* non-differential */ | |
175 | #define ADS_DFR (0 << 2) /* differential */ | |
2991a1ca | 176 | #define ADS_PD10_PDOWN (0 << 0) /* low power mode + penirq */ |
ffa458c1 DB |
177 | #define ADS_PD10_ADC_ON (1 << 0) /* ADC on */ |
178 | #define ADS_PD10_REF_ON (2 << 0) /* vREF on + penirq */ | |
179 | #define ADS_PD10_ALL_ON (3 << 0) /* ADC + vREF on */ | |
180 | ||
181 | #define MAX_12BIT ((1<<12)-1) | |
182 | ||
183 | /* leave ADC powered up (disables penirq) between differential samples */ | |
de2defd9 ID |
184 | #define READ_12BIT_DFR(x, adc, vref) (ADS_START | ADS_A2A1A0_d_ ## x \ |
185 | | ADS_12_BIT | ADS_DFR | \ | |
186 | (adc ? ADS_PD10_ADC_ON : 0) | (vref ? ADS_PD10_REF_ON : 0)) | |
ffa458c1 | 187 | |
de2defd9 ID |
188 | #define READ_Y(vref) (READ_12BIT_DFR(y, 1, vref)) |
189 | #define READ_Z1(vref) (READ_12BIT_DFR(z1, 1, vref)) | |
190 | #define READ_Z2(vref) (READ_12BIT_DFR(z2, 1, vref)) | |
53a0ef89 | 191 | |
de2defd9 ID |
192 | #define READ_X(vref) (READ_12BIT_DFR(x, 1, vref)) |
193 | #define PWRDOWN (READ_12BIT_DFR(y, 0, 0)) /* LAST */ | |
ffa458c1 DB |
194 | |
195 | /* single-ended samples need to first power up reference voltage; | |
196 | * we leave both ADC and VREF powered | |
197 | */ | |
198 | #define READ_12BIT_SER(x) (ADS_START | ADS_A2A1A0_ ## x \ | |
199 | | ADS_12_BIT | ADS_SER) | |
200 | ||
de2defd9 ID |
201 | #define REF_ON (READ_12BIT_DFR(x, 1, 1)) |
202 | #define REF_OFF (READ_12BIT_DFR(y, 0, 0)) | |
ffa458c1 | 203 | |
2991a1ca JW |
204 | /* Must be called with ts->lock held */ |
205 | static void ads7846_stop(struct ads7846 *ts) | |
206 | { | |
207 | if (!ts->disabled && !ts->suspended) { | |
208 | /* Signal IRQ thread to stop polling and disable the handler. */ | |
209 | ts->stopped = true; | |
210 | mb(); | |
211 | wake_up(&ts->wait); | |
212 | disable_irq(ts->spi->irq); | |
213 | } | |
214 | } | |
215 | ||
216 | /* Must be called with ts->lock held */ | |
217 | static void ads7846_restart(struct ads7846 *ts) | |
218 | { | |
219 | if (!ts->disabled && !ts->suspended) { | |
220 | /* Tell IRQ thread that it may poll the device. */ | |
221 | ts->stopped = false; | |
222 | mb(); | |
223 | enable_irq(ts->spi->irq); | |
224 | } | |
225 | } | |
226 | ||
227 | /* Must be called with ts->lock held */ | |
228 | static void __ads7846_disable(struct ads7846 *ts) | |
229 | { | |
230 | ads7846_stop(ts); | |
231 | regulator_disable(ts->reg); | |
232 | ||
233 | /* | |
234 | * We know the chip's in low power mode since we always | |
235 | * leave it that way after every request | |
236 | */ | |
237 | } | |
238 | ||
239 | /* Must be called with ts->lock held */ | |
240 | static void __ads7846_enable(struct ads7846 *ts) | |
241 | { | |
f94352f8 MB |
242 | int error; |
243 | ||
244 | error = regulator_enable(ts->reg); | |
245 | if (error != 0) | |
246 | dev_err(&ts->spi->dev, "Failed to enable supply: %d\n", error); | |
247 | ||
2991a1ca JW |
248 | ads7846_restart(ts); |
249 | } | |
250 | ||
251 | static void ads7846_disable(struct ads7846 *ts) | |
252 | { | |
253 | mutex_lock(&ts->lock); | |
254 | ||
255 | if (!ts->disabled) { | |
256 | ||
257 | if (!ts->suspended) | |
258 | __ads7846_disable(ts); | |
259 | ||
260 | ts->disabled = true; | |
261 | } | |
262 | ||
263 | mutex_unlock(&ts->lock); | |
264 | } | |
265 | ||
266 | static void ads7846_enable(struct ads7846 *ts) | |
267 | { | |
268 | mutex_lock(&ts->lock); | |
269 | ||
270 | if (ts->disabled) { | |
271 | ||
272 | ts->disabled = false; | |
273 | ||
274 | if (!ts->suspended) | |
275 | __ads7846_enable(ts); | |
276 | } | |
277 | ||
278 | mutex_unlock(&ts->lock); | |
279 | } | |
280 | ||
ffa458c1 DB |
281 | /*--------------------------------------------------------------------------*/ |
282 | ||
283 | /* | |
284 | * Non-touchscreen sensors only use single-ended conversions. | |
2c8dc071 DB |
285 | * The range is GND..vREF. The ads7843 and ads7835 must use external vREF; |
286 | * ads7846 lets that pin be unconnected, to use internal vREF. | |
ffa458c1 DB |
287 | */ |
288 | ||
289 | struct ser_req { | |
d93f70b2 | 290 | u8 ref_on; |
ffa458c1 | 291 | u8 command; |
d93f70b2 | 292 | u8 ref_off; |
ffa458c1 | 293 | u16 scratch; |
ffa458c1 DB |
294 | struct spi_message msg; |
295 | struct spi_transfer xfer[6]; | |
1dbe7dad AS |
296 | /* |
297 | * DMA (thus cache coherency maintenance) requires the | |
298 | * transfer buffers to live in their own cache lines. | |
299 | */ | |
300 | __be16 sample ____cacheline_aligned; | |
ffa458c1 DB |
301 | }; |
302 | ||
3eac5c7e AG |
303 | struct ads7845_ser_req { |
304 | u8 command[3]; | |
3eac5c7e AG |
305 | struct spi_message msg; |
306 | struct spi_transfer xfer[2]; | |
1dbe7dad AS |
307 | /* |
308 | * DMA (thus cache coherency maintenance) requires the | |
309 | * transfer buffers to live in their own cache lines. | |
310 | */ | |
311 | u8 sample[3] ____cacheline_aligned; | |
3eac5c7e AG |
312 | }; |
313 | ||
ffa458c1 DB |
314 | static int ads7846_read12_ser(struct device *dev, unsigned command) |
315 | { | |
2991a1ca JW |
316 | struct spi_device *spi = to_spi_device(dev); |
317 | struct ads7846 *ts = dev_get_drvdata(dev); | |
318 | struct ser_req *req; | |
319 | int status; | |
ffa458c1 | 320 | |
2991a1ca | 321 | req = kzalloc(sizeof *req, GFP_KERNEL); |
ffa458c1 DB |
322 | if (!req) |
323 | return -ENOMEM; | |
324 | ||
0b7018aa | 325 | spi_message_init(&req->msg); |
8275c642 | 326 | |
2c8dc071 | 327 | /* maybe turn on internal vREF, and let it settle */ |
ebcaaad9 | 328 | if (ts->use_internal) { |
2c8dc071 DB |
329 | req->ref_on = REF_ON; |
330 | req->xfer[0].tx_buf = &req->ref_on; | |
331 | req->xfer[0].len = 1; | |
332 | spi_message_add_tail(&req->xfer[0], &req->msg); | |
333 | ||
334 | req->xfer[1].rx_buf = &req->scratch; | |
335 | req->xfer[1].len = 2; | |
336 | ||
337 | /* for 1uF, settle for 800 usec; no cap, 100 usec. */ | |
338 | req->xfer[1].delay_usecs = ts->vref_delay_usecs; | |
339 | spi_message_add_tail(&req->xfer[1], &req->msg); | |
ebcaaad9 AS |
340 | |
341 | /* Enable reference voltage */ | |
342 | command |= ADS_PD10_REF_ON; | |
2c8dc071 | 343 | } |
ffa458c1 | 344 | |
ebcaaad9 AS |
345 | /* Enable ADC in every case */ |
346 | command |= ADS_PD10_ADC_ON; | |
347 | ||
ffa458c1 DB |
348 | /* take sample */ |
349 | req->command = (u8) command; | |
350 | req->xfer[2].tx_buf = &req->command; | |
351 | req->xfer[2].len = 1; | |
2c8dc071 DB |
352 | spi_message_add_tail(&req->xfer[2], &req->msg); |
353 | ||
ffa458c1 DB |
354 | req->xfer[3].rx_buf = &req->sample; |
355 | req->xfer[3].len = 2; | |
2c8dc071 | 356 | spi_message_add_tail(&req->xfer[3], &req->msg); |
ffa458c1 DB |
357 | |
358 | /* REVISIT: take a few more samples, and compare ... */ | |
359 | ||
969111e9 NF |
360 | /* converter in low power mode & enable PENIRQ */ |
361 | req->ref_off = PWRDOWN; | |
362 | req->xfer[4].tx_buf = &req->ref_off; | |
363 | req->xfer[4].len = 1; | |
364 | spi_message_add_tail(&req->xfer[4], &req->msg); | |
365 | ||
366 | req->xfer[5].rx_buf = &req->scratch; | |
367 | req->xfer[5].len = 2; | |
368 | CS_CHANGE(req->xfer[5]); | |
369 | spi_message_add_tail(&req->xfer[5], &req->msg); | |
ffa458c1 | 370 | |
2991a1ca JW |
371 | mutex_lock(&ts->lock); |
372 | ads7846_stop(ts); | |
ffa458c1 | 373 | status = spi_sync(spi, &req->msg); |
2991a1ca JW |
374 | ads7846_restart(ts); |
375 | mutex_unlock(&ts->lock); | |
ffa458c1 | 376 | |
c24b2602 MP |
377 | if (status == 0) { |
378 | /* on-wire is a must-ignore bit, a BE12 value, then padding */ | |
7c6d0ee1 DB |
379 | status = be16_to_cpu(req->sample); |
380 | status = status >> 3; | |
381 | status &= 0x0fff; | |
c24b2602 | 382 | } |
ffa458c1 | 383 | |
9084533e | 384 | kfree(req); |
7c6d0ee1 | 385 | return status; |
ffa458c1 DB |
386 | } |
387 | ||
3eac5c7e AG |
388 | static int ads7845_read12_ser(struct device *dev, unsigned command) |
389 | { | |
2991a1ca JW |
390 | struct spi_device *spi = to_spi_device(dev); |
391 | struct ads7846 *ts = dev_get_drvdata(dev); | |
392 | struct ads7845_ser_req *req; | |
393 | int status; | |
3eac5c7e | 394 | |
2991a1ca | 395 | req = kzalloc(sizeof *req, GFP_KERNEL); |
3eac5c7e AG |
396 | if (!req) |
397 | return -ENOMEM; | |
398 | ||
399 | spi_message_init(&req->msg); | |
400 | ||
401 | req->command[0] = (u8) command; | |
402 | req->xfer[0].tx_buf = req->command; | |
403 | req->xfer[0].rx_buf = req->sample; | |
404 | req->xfer[0].len = 3; | |
405 | spi_message_add_tail(&req->xfer[0], &req->msg); | |
406 | ||
2991a1ca JW |
407 | mutex_lock(&ts->lock); |
408 | ads7846_stop(ts); | |
3eac5c7e | 409 | status = spi_sync(spi, &req->msg); |
2991a1ca JW |
410 | ads7846_restart(ts); |
411 | mutex_unlock(&ts->lock); | |
3eac5c7e AG |
412 | |
413 | if (status == 0) { | |
414 | /* BE12 value, then padding */ | |
415 | status = be16_to_cpu(*((u16 *)&req->sample[1])); | |
416 | status = status >> 3; | |
417 | status &= 0x0fff; | |
418 | } | |
419 | ||
420 | kfree(req); | |
421 | return status; | |
422 | } | |
423 | ||
2c8dc071 DB |
424 | #if defined(CONFIG_HWMON) || defined(CONFIG_HWMON_MODULE) |
425 | ||
426 | #define SHOW(name, var, adjust) static ssize_t \ | |
ffa458c1 DB |
427 | name ## _show(struct device *dev, struct device_attribute *attr, char *buf) \ |
428 | { \ | |
2c8dc071 | 429 | struct ads7846 *ts = dev_get_drvdata(dev); \ |
ffa458c1 | 430 | ssize_t v = ads7846_read12_ser(dev, \ |
ebcaaad9 | 431 | READ_12BIT_SER(var)); \ |
ffa458c1 DB |
432 | if (v < 0) \ |
433 | return v; \ | |
2c8dc071 | 434 | return sprintf(buf, "%u\n", adjust(ts, v)); \ |
ffa458c1 DB |
435 | } \ |
436 | static DEVICE_ATTR(name, S_IRUGO, name ## _show, NULL); | |
437 | ||
2c8dc071 | 438 | |
b731d7b6 | 439 | /* Sysfs conventions report temperatures in millidegrees Celsius. |
2c8dc071 DB |
440 | * ADS7846 could use the low-accuracy two-sample scheme, but can't do the high |
441 | * accuracy scheme without calibration data. For now we won't try either; | |
442 | * userspace sees raw sensor values, and must scale/calibrate appropriately. | |
443 | */ | |
444 | static inline unsigned null_adjust(struct ads7846 *ts, ssize_t v) | |
445 | { | |
446 | return v; | |
447 | } | |
448 | ||
449 | SHOW(temp0, temp0, null_adjust) /* temp1_input */ | |
450 | SHOW(temp1, temp1, null_adjust) /* temp2_input */ | |
451 | ||
452 | ||
453 | /* sysfs conventions report voltages in millivolts. We can convert voltages | |
454 | * if we know vREF. userspace may need to scale vAUX to match the board's | |
455 | * external resistors; we assume that vBATT only uses the internal ones. | |
456 | */ | |
457 | static inline unsigned vaux_adjust(struct ads7846 *ts, ssize_t v) | |
458 | { | |
459 | unsigned retval = v; | |
460 | ||
461 | /* external resistors may scale vAUX into 0..vREF */ | |
7c6d0ee1 | 462 | retval *= ts->vref_mv; |
2c8dc071 | 463 | retval = retval >> 12; |
2991a1ca | 464 | |
2c8dc071 DB |
465 | return retval; |
466 | } | |
467 | ||
468 | static inline unsigned vbatt_adjust(struct ads7846 *ts, ssize_t v) | |
469 | { | |
470 | unsigned retval = vaux_adjust(ts, v); | |
471 | ||
472 | /* ads7846 has a resistor ladder to scale this signal down */ | |
473 | if (ts->model == 7846) | |
474 | retval *= 4; | |
2991a1ca | 475 | |
2c8dc071 DB |
476 | return retval; |
477 | } | |
478 | ||
479 | SHOW(in0_input, vaux, vaux_adjust) | |
480 | SHOW(in1_input, vbatt, vbatt_adjust) | |
481 | ||
2c8dc071 DB |
482 | static struct attribute *ads7846_attributes[] = { |
483 | &dev_attr_temp0.attr, | |
484 | &dev_attr_temp1.attr, | |
485 | &dev_attr_in0_input.attr, | |
486 | &dev_attr_in1_input.attr, | |
487 | NULL, | |
488 | }; | |
489 | ||
490 | static struct attribute_group ads7846_attr_group = { | |
491 | .attrs = ads7846_attributes, | |
492 | }; | |
493 | ||
494 | static struct attribute *ads7843_attributes[] = { | |
495 | &dev_attr_in0_input.attr, | |
496 | &dev_attr_in1_input.attr, | |
497 | NULL, | |
498 | }; | |
499 | ||
500 | static struct attribute_group ads7843_attr_group = { | |
501 | .attrs = ads7843_attributes, | |
502 | }; | |
503 | ||
504 | static struct attribute *ads7845_attributes[] = { | |
505 | &dev_attr_in0_input.attr, | |
506 | NULL, | |
507 | }; | |
508 | ||
509 | static struct attribute_group ads7845_attr_group = { | |
510 | .attrs = ads7845_attributes, | |
511 | }; | |
512 | ||
513 | static int ads784x_hwmon_register(struct spi_device *spi, struct ads7846 *ts) | |
514 | { | |
1beeffe4 | 515 | struct device *hwmon; |
2c8dc071 DB |
516 | int err; |
517 | ||
518 | /* hwmon sensors need a reference voltage */ | |
519 | switch (ts->model) { | |
520 | case 7846: | |
7c6d0ee1 | 521 | if (!ts->vref_mv) { |
2c8dc071 | 522 | dev_dbg(&spi->dev, "assuming 2.5V internal vREF\n"); |
7c6d0ee1 | 523 | ts->vref_mv = 2500; |
ebcaaad9 | 524 | ts->use_internal = true; |
2c8dc071 DB |
525 | } |
526 | break; | |
527 | case 7845: | |
528 | case 7843: | |
7c6d0ee1 | 529 | if (!ts->vref_mv) { |
2c8dc071 DB |
530 | dev_warn(&spi->dev, |
531 | "external vREF for ADS%d not specified\n", | |
532 | ts->model); | |
533 | return 0; | |
534 | } | |
535 | break; | |
536 | } | |
537 | ||
538 | /* different chips have different sensor groups */ | |
539 | switch (ts->model) { | |
540 | case 7846: | |
541 | ts->attr_group = &ads7846_attr_group; | |
542 | break; | |
543 | case 7845: | |
544 | ts->attr_group = &ads7845_attr_group; | |
545 | break; | |
546 | case 7843: | |
547 | ts->attr_group = &ads7843_attr_group; | |
548 | break; | |
549 | default: | |
550 | dev_dbg(&spi->dev, "ADS%d not recognized\n", ts->model); | |
551 | return 0; | |
552 | } | |
553 | ||
554 | err = sysfs_create_group(&spi->dev.kobj, ts->attr_group); | |
555 | if (err) | |
556 | return err; | |
557 | ||
558 | hwmon = hwmon_device_register(&spi->dev); | |
559 | if (IS_ERR(hwmon)) { | |
560 | sysfs_remove_group(&spi->dev.kobj, ts->attr_group); | |
561 | return PTR_ERR(hwmon); | |
562 | } | |
563 | ||
564 | ts->hwmon = hwmon; | |
565 | return 0; | |
566 | } | |
567 | ||
568 | static void ads784x_hwmon_unregister(struct spi_device *spi, | |
569 | struct ads7846 *ts) | |
570 | { | |
571 | if (ts->hwmon) { | |
572 | sysfs_remove_group(&spi->dev.kobj, ts->attr_group); | |
573 | hwmon_device_unregister(ts->hwmon); | |
574 | } | |
575 | } | |
576 | ||
577 | #else | |
578 | static inline int ads784x_hwmon_register(struct spi_device *spi, | |
579 | struct ads7846 *ts) | |
580 | { | |
581 | return 0; | |
582 | } | |
583 | ||
584 | static inline void ads784x_hwmon_unregister(struct spi_device *spi, | |
585 | struct ads7846 *ts) | |
586 | { | |
587 | } | |
588 | #endif | |
ffa458c1 | 589 | |
438f2a74 ID |
590 | static ssize_t ads7846_pen_down_show(struct device *dev, |
591 | struct device_attribute *attr, char *buf) | |
592 | { | |
2991a1ca JW |
593 | struct ads7846 *ts = dev_get_drvdata(dev); |
594 | ||
595 | return sprintf(buf, "%u\n", ts->pendown); | |
438f2a74 ID |
596 | } |
597 | ||
598 | static DEVICE_ATTR(pen_down, S_IRUGO, ads7846_pen_down_show, NULL); | |
599 | ||
7de90a8c ID |
600 | static ssize_t ads7846_disable_show(struct device *dev, |
601 | struct device_attribute *attr, char *buf) | |
602 | { | |
2991a1ca | 603 | struct ads7846 *ts = dev_get_drvdata(dev); |
7de90a8c ID |
604 | |
605 | return sprintf(buf, "%u\n", ts->disabled); | |
606 | } | |
607 | ||
608 | static ssize_t ads7846_disable_store(struct device *dev, | |
609 | struct device_attribute *attr, | |
610 | const char *buf, size_t count) | |
611 | { | |
612 | struct ads7846 *ts = dev_get_drvdata(dev); | |
76496e7a JD |
613 | unsigned int i; |
614 | int err; | |
160f1fef | 615 | |
76496e7a JD |
616 | err = kstrtouint(buf, 10, &i); |
617 | if (err) | |
618 | return err; | |
7de90a8c | 619 | |
7de90a8c ID |
620 | if (i) |
621 | ads7846_disable(ts); | |
622 | else | |
623 | ads7846_enable(ts); | |
624 | ||
7de90a8c ID |
625 | return count; |
626 | } | |
627 | ||
628 | static DEVICE_ATTR(disable, 0664, ads7846_disable_show, ads7846_disable_store); | |
629 | ||
2c8dc071 | 630 | static struct attribute *ads784x_attributes[] = { |
8dd51650 DT |
631 | &dev_attr_pen_down.attr, |
632 | &dev_attr_disable.attr, | |
633 | NULL, | |
634 | }; | |
635 | ||
2c8dc071 DB |
636 | static struct attribute_group ads784x_attr_group = { |
637 | .attrs = ads784x_attributes, | |
8dd51650 DT |
638 | }; |
639 | ||
ffa458c1 DB |
640 | /*--------------------------------------------------------------------------*/ |
641 | ||
4d5975e5 EM |
642 | static int get_pendown_state(struct ads7846 *ts) |
643 | { | |
644 | if (ts->get_pendown_state) | |
645 | return ts->get_pendown_state(); | |
646 | ||
647 | return !gpio_get_value(ts->gpio_pendown); | |
648 | } | |
649 | ||
fd746d54 EM |
650 | static void null_wait_for_sync(void) |
651 | { | |
652 | } | |
653 | ||
2991a1ca JW |
654 | static int ads7846_debounce_filter(void *ads, int data_idx, int *val) |
655 | { | |
656 | struct ads7846 *ts = ads; | |
657 | ||
658 | if (!ts->read_cnt || (abs(ts->last_read - *val) > ts->debounce_tol)) { | |
659 | /* Start over collecting consistent readings. */ | |
660 | ts->read_rep = 0; | |
661 | /* | |
662 | * Repeat it, if this was the first read or the read | |
663 | * wasn't consistent enough. | |
664 | */ | |
665 | if (ts->read_cnt < ts->debounce_max) { | |
666 | ts->last_read = *val; | |
667 | ts->read_cnt++; | |
668 | return ADS7846_FILTER_REPEAT; | |
669 | } else { | |
670 | /* | |
671 | * Maximum number of debouncing reached and still | |
672 | * not enough number of consistent readings. Abort | |
673 | * the whole sample, repeat it in the next sampling | |
674 | * period. | |
675 | */ | |
676 | ts->read_cnt = 0; | |
677 | return ADS7846_FILTER_IGNORE; | |
678 | } | |
679 | } else { | |
680 | if (++ts->read_rep > ts->debounce_rep) { | |
681 | /* | |
682 | * Got a good reading for this coordinate, | |
683 | * go for the next one. | |
684 | */ | |
685 | ts->read_cnt = 0; | |
686 | ts->read_rep = 0; | |
687 | return ADS7846_FILTER_OK; | |
688 | } else { | |
689 | /* Read more values that are consistent. */ | |
690 | ts->read_cnt++; | |
691 | return ADS7846_FILTER_REPEAT; | |
692 | } | |
693 | } | |
694 | } | |
695 | ||
696 | static int ads7846_no_filter(void *ads, int data_idx, int *val) | |
697 | { | |
698 | return ADS7846_FILTER_OK; | |
699 | } | |
700 | ||
701 | static int ads7846_get_value(struct ads7846 *ts, struct spi_message *m) | |
702 | { | |
703 | struct spi_transfer *t = | |
704 | list_entry(m->transfers.prev, struct spi_transfer, transfer_list); | |
705 | ||
706 | if (ts->model == 7845) { | |
707 | return be16_to_cpup((__be16 *)&(((char*)t->rx_buf)[1])) >> 3; | |
708 | } else { | |
709 | /* | |
710 | * adjust: on-wire is a must-ignore bit, a BE12 value, then | |
711 | * padding; built from two 8 bit values written msb-first. | |
712 | */ | |
713 | return be16_to_cpup((__be16 *)t->rx_buf) >> 3; | |
714 | } | |
715 | } | |
716 | ||
717 | static void ads7846_update_value(struct spi_message *m, int val) | |
718 | { | |
719 | struct spi_transfer *t = | |
720 | list_entry(m->transfers.prev, struct spi_transfer, transfer_list); | |
721 | ||
722 | *(u16 *)t->rx_buf = val; | |
723 | } | |
724 | ||
725 | static void ads7846_read_state(struct ads7846 *ts) | |
726 | { | |
727 | struct ads7846_packet *packet = ts->packet; | |
728 | struct spi_message *m; | |
729 | int msg_idx = 0; | |
730 | int val; | |
731 | int action; | |
732 | int error; | |
733 | ||
734 | while (msg_idx < ts->msg_count) { | |
735 | ||
736 | ts->wait_for_sync(); | |
737 | ||
738 | m = &ts->msg[msg_idx]; | |
739 | error = spi_sync(ts->spi, m); | |
740 | if (error) { | |
741 | dev_err(&ts->spi->dev, "spi_async --> %d\n", error); | |
742 | packet->tc.ignore = true; | |
743 | return; | |
744 | } | |
745 | ||
746 | /* | |
747 | * Last message is power down request, no need to convert | |
748 | * or filter the value. | |
749 | */ | |
750 | if (msg_idx < ts->msg_count - 1) { | |
ffa458c1 | 751 | |
2991a1ca JW |
752 | val = ads7846_get_value(ts, m); |
753 | ||
754 | action = ts->filter(ts->filter_data, msg_idx, &val); | |
755 | switch (action) { | |
756 | case ADS7846_FILTER_REPEAT: | |
757 | continue; | |
758 | ||
759 | case ADS7846_FILTER_IGNORE: | |
760 | packet->tc.ignore = true; | |
761 | msg_idx = ts->msg_count - 1; | |
762 | continue; | |
763 | ||
764 | case ADS7846_FILTER_OK: | |
765 | ads7846_update_value(m, val); | |
766 | packet->tc.ignore = false; | |
767 | msg_idx++; | |
768 | break; | |
769 | ||
770 | default: | |
771 | BUG(); | |
772 | } | |
773 | } else { | |
774 | msg_idx++; | |
775 | } | |
776 | } | |
777 | } | |
778 | ||
779 | static void ads7846_report_state(struct ads7846 *ts) | |
ffa458c1 | 780 | { |
2991a1ca JW |
781 | struct ads7846_packet *packet = ts->packet; |
782 | unsigned int Rt; | |
783 | u16 x, y, z1, z2; | |
ffa458c1 | 784 | |
2991a1ca JW |
785 | /* |
786 | * ads7846_get_value() does in-place conversion (including byte swap) | |
787 | * from on-the-wire format as part of debouncing to get stable | |
788 | * readings. | |
ffa458c1 | 789 | */ |
3eac5c7e AG |
790 | if (ts->model == 7845) { |
791 | x = *(u16 *)packet->tc.x_buf; | |
792 | y = *(u16 *)packet->tc.y_buf; | |
793 | z1 = 0; | |
794 | z2 = 0; | |
795 | } else { | |
796 | x = packet->tc.x; | |
797 | y = packet->tc.y; | |
798 | z1 = packet->tc.z1; | |
799 | z2 = packet->tc.z2; | |
800 | } | |
ffa458c1 DB |
801 | |
802 | /* range filtering */ | |
803 | if (x == MAX_12BIT) | |
804 | x = 0; | |
805 | ||
9460b652 HCE |
806 | if (ts->model == 7843) { |
807 | Rt = ts->pressure_max / 2; | |
3eac5c7e AG |
808 | } else if (ts->model == 7845) { |
809 | if (get_pendown_state(ts)) | |
810 | Rt = ts->pressure_max / 2; | |
811 | else | |
812 | Rt = 0; | |
813 | dev_vdbg(&ts->spi->dev, "x/y: %d/%d, PD %d\n", x, y, Rt); | |
9460b652 | 814 | } else if (likely(x && z1)) { |
ffa458c1 DB |
815 | /* compute touch pressure resistance using equation #2 */ |
816 | Rt = z2; | |
817 | Rt -= z1; | |
818 | Rt *= x; | |
819 | Rt *= ts->x_plate_ohms; | |
820 | Rt /= z1; | |
821 | Rt = (Rt + 2047) >> 12; | |
9460b652 | 822 | } else { |
ffa458c1 | 823 | Rt = 0; |
9460b652 | 824 | } |
969111e9 | 825 | |
2991a1ca JW |
826 | /* |
827 | * Sample found inconsistent by debouncing or pressure is beyond | |
1936d590 ID |
828 | * the maximum. Don't report it to user space, repeat at least |
829 | * once more the measurement | |
830 | */ | |
e8f462d2 | 831 | if (packet->tc.ignore || Rt > ts->pressure_max) { |
52ce4eaa PM |
832 | dev_vdbg(&ts->spi->dev, "ignored %d pressure %d\n", |
833 | packet->tc.ignore, Rt); | |
d5b415c9 ID |
834 | return; |
835 | } | |
836 | ||
2991a1ca JW |
837 | /* |
838 | * Maybe check the pendown state before reporting. This discards | |
1d25891f SH |
839 | * false readings when the pen is lifted. |
840 | */ | |
841 | if (ts->penirq_recheck_delay_usecs) { | |
842 | udelay(ts->penirq_recheck_delay_usecs); | |
4d5975e5 | 843 | if (!get_pendown_state(ts)) |
1d25891f SH |
844 | Rt = 0; |
845 | } | |
846 | ||
2991a1ca JW |
847 | /* |
848 | * NOTE: We can't rely on the pressure to determine the pen down | |
849 | * state, even this controller has a pressure sensor. The pressure | |
15e3589e ID |
850 | * value can fluctuate for quite a while after lifting the pen and |
851 | * in some cases may not even settle at the expected value. | |
ffa458c1 | 852 | * |
15e3589e ID |
853 | * The only safe way to check for the pen up condition is in the |
854 | * timer by reading the pen signal state (it's a GPIO _and_ IRQ). | |
ffa458c1 | 855 | */ |
ffa458c1 | 856 | if (Rt) { |
15e3589e | 857 | struct input_dev *input = ts->input; |
ae82d5ab | 858 | |
2991a1ca JW |
859 | if (ts->swap_xy) |
860 | swap(x, y); | |
861 | ||
15e3589e ID |
862 | if (!ts->pendown) { |
863 | input_report_key(input, BTN_TOUCH, 1); | |
2991a1ca | 864 | ts->pendown = true; |
52ce4eaa | 865 | dev_vdbg(&ts->spi->dev, "DOWN\n"); |
15e3589e | 866 | } |
86579a4c | 867 | |
15e3589e ID |
868 | input_report_abs(input, ABS_X, x); |
869 | input_report_abs(input, ABS_Y, y); | |
30ad7ba0 | 870 | input_report_abs(input, ABS_PRESSURE, ts->pressure_max - Rt); |
ffa458c1 | 871 | |
15e3589e | 872 | input_sync(input); |
52ce4eaa | 873 | dev_vdbg(&ts->spi->dev, "%4d/%4d/%4d\n", x, y, Rt); |
15e3589e | 874 | } |
da970e69 ID |
875 | } |
876 | ||
2991a1ca | 877 | static irqreturn_t ads7846_hard_irq(int irq, void *handle) |
da970e69 | 878 | { |
2991a1ca | 879 | struct ads7846 *ts = handle; |
da970e69 | 880 | |
2991a1ca | 881 | return get_pendown_state(ts) ? IRQ_WAKE_THREAD : IRQ_HANDLED; |
0b7018aa ID |
882 | } |
883 | ||
0b7018aa | 884 | |
7d12e780 | 885 | static irqreturn_t ads7846_irq(int irq, void *handle) |
0b7018aa ID |
886 | { |
887 | struct ads7846 *ts = handle; | |
7de90a8c | 888 | |
2991a1ca JW |
889 | /* Start with a small delay before checking pendown state */ |
890 | msleep(TS_POLL_DELAY); | |
ffa458c1 | 891 | |
2991a1ca | 892 | while (!ts->stopped && get_pendown_state(ts)) { |
ffa458c1 | 893 | |
2991a1ca JW |
894 | /* pen is down, continue with the measurement */ |
895 | ads7846_read_state(ts); | |
ffa458c1 | 896 | |
2991a1ca JW |
897 | if (!ts->stopped) |
898 | ads7846_report_state(ts); | |
c9e617a5 | 899 | |
2991a1ca JW |
900 | wait_event_timeout(ts->wait, ts->stopped, |
901 | msecs_to_jiffies(TS_POLL_PERIOD)); | |
ffa458c1 DB |
902 | } |
903 | ||
2991a1ca JW |
904 | if (ts->pendown) { |
905 | struct input_dev *input = ts->input; | |
7de90a8c | 906 | |
2991a1ca JW |
907 | input_report_key(input, BTN_TOUCH, 0); |
908 | input_report_abs(input, ABS_PRESSURE, 0); | |
909 | input_sync(input); | |
7de90a8c | 910 | |
2991a1ca JW |
911 | ts->pendown = false; |
912 | dev_vdbg(&ts->spi->dev, "UP\n"); | |
913 | } | |
91143379 | 914 | |
2991a1ca | 915 | return IRQ_HANDLED; |
7de90a8c ID |
916 | } |
917 | ||
3c36e719 MB |
918 | #ifdef CONFIG_PM_SLEEP |
919 | static int ads7846_suspend(struct device *dev) | |
7de90a8c | 920 | { |
3c36e719 | 921 | struct ads7846 *ts = dev_get_drvdata(dev); |
7de90a8c | 922 | |
2991a1ca | 923 | mutex_lock(&ts->lock); |
7de90a8c | 924 | |
2991a1ca | 925 | if (!ts->suspended) { |
7de90a8c | 926 | |
2991a1ca JW |
927 | if (!ts->disabled) |
928 | __ads7846_disable(ts); | |
7de90a8c | 929 | |
2991a1ca JW |
930 | if (device_may_wakeup(&ts->spi->dev)) |
931 | enable_irq_wake(ts->spi->irq); | |
fdba2bb1 | 932 | |
2991a1ca JW |
933 | ts->suspended = true; |
934 | } | |
935 | ||
936 | mutex_unlock(&ts->lock); | |
7de90a8c | 937 | |
2991a1ca | 938 | return 0; |
ffa458c1 DB |
939 | } |
940 | ||
3c36e719 | 941 | static int ads7846_resume(struct device *dev) |
ffa458c1 | 942 | { |
3c36e719 | 943 | struct ads7846 *ts = dev_get_drvdata(dev); |
ffa458c1 | 944 | |
2991a1ca JW |
945 | mutex_lock(&ts->lock); |
946 | ||
947 | if (ts->suspended) { | |
fdba2bb1 | 948 | |
2991a1ca | 949 | ts->suspended = false; |
7de90a8c | 950 | |
2991a1ca JW |
951 | if (device_may_wakeup(&ts->spi->dev)) |
952 | disable_irq_wake(ts->spi->irq); | |
7de90a8c | 953 | |
2991a1ca JW |
954 | if (!ts->disabled) |
955 | __ads7846_enable(ts); | |
956 | } | |
957 | ||
958 | mutex_unlock(&ts->lock); | |
7de90a8c | 959 | |
ffa458c1 DB |
960 | return 0; |
961 | } | |
3c36e719 MB |
962 | #endif |
963 | ||
964 | static SIMPLE_DEV_PM_OPS(ads7846_pm, ads7846_suspend, ads7846_resume); | |
ffa458c1 | 965 | |
5298cc4c | 966 | static int ads7846_setup_pendown(struct spi_device *spi, |
57691a1e DT |
967 | struct ads7846 *ts, |
968 | const struct ads7846_platform_data *pdata) | |
4d5975e5 | 969 | { |
4d5975e5 EM |
970 | int err; |
971 | ||
0fbc9fdb DT |
972 | /* |
973 | * REVISIT when the irq can be triggered active-low, or if for some | |
4d5975e5 EM |
974 | * reason the touchscreen isn't hooked up, we don't need to access |
975 | * the pendown state. | |
976 | */ | |
4d5975e5 EM |
977 | |
978 | if (pdata->get_pendown_state) { | |
979 | ts->get_pendown_state = pdata->get_pendown_state; | |
0fbc9fdb | 980 | } else if (gpio_is_valid(pdata->gpio_pendown)) { |
4d5975e5 | 981 | |
58c24400 IG |
982 | err = gpio_request_one(pdata->gpio_pendown, GPIOF_IN, |
983 | "ads7846_pendown"); | |
0fbc9fdb | 984 | if (err) { |
58c24400 IG |
985 | dev_err(&spi->dev, |
986 | "failed to request/setup pendown GPIO%d: %d\n", | |
987 | pdata->gpio_pendown, err); | |
1201e7e6 IG |
988 | return err; |
989 | } | |
4d5975e5 | 990 | |
0fbc9fdb DT |
991 | ts->gpio_pendown = pdata->gpio_pendown; |
992 | ||
c4f49254 IG |
993 | if (pdata->gpio_pendown_debounce) |
994 | gpio_set_debounce(pdata->gpio_pendown, | |
995 | pdata->gpio_pendown_debounce); | |
0fbc9fdb DT |
996 | } else { |
997 | dev_err(&spi->dev, "no get_pendown_state nor gpio_pendown?\n"); | |
998 | return -EINVAL; | |
999 | } | |
2991a1ca | 1000 | |
4d5975e5 EM |
1001 | return 0; |
1002 | } | |
1003 | ||
2991a1ca JW |
1004 | /* |
1005 | * Set up the transfers to read touchscreen state; this assumes we | |
1006 | * use formula #2 for pressure, not #3. | |
1007 | */ | |
5298cc4c | 1008 | static void ads7846_setup_spi_msg(struct ads7846 *ts, |
57691a1e | 1009 | const struct ads7846_platform_data *pdata) |
ffa458c1 | 1010 | { |
2991a1ca JW |
1011 | struct spi_message *m = &ts->msg[0]; |
1012 | struct spi_transfer *x = ts->xfer; | |
1013 | struct ads7846_packet *packet = ts->packet; | |
1014 | int vref = pdata->keep_vref_on; | |
de2defd9 | 1015 | |
06a09124 | 1016 | if (ts->model == 7873) { |
2991a1ca JW |
1017 | /* |
1018 | * The AD7873 is almost identical to the ADS7846 | |
06a09124 | 1019 | * keep VREF off during differential/ratiometric |
2991a1ca | 1020 | * conversion modes. |
06a09124 MH |
1021 | */ |
1022 | ts->model = 7846; | |
1023 | vref = 0; | |
1024 | } | |
1025 | ||
2991a1ca | 1026 | ts->msg_count = 1; |
0b7018aa | 1027 | spi_message_init(m); |
2991a1ca | 1028 | m->context = ts; |
0b7018aa | 1029 | |
3eac5c7e AG |
1030 | if (ts->model == 7845) { |
1031 | packet->read_y_cmd[0] = READ_Y(vref); | |
1032 | packet->read_y_cmd[1] = 0; | |
1033 | packet->read_y_cmd[2] = 0; | |
1034 | x->tx_buf = &packet->read_y_cmd[0]; | |
1035 | x->rx_buf = &packet->tc.y_buf[0]; | |
1036 | x->len = 3; | |
1037 | spi_message_add_tail(x, m); | |
1038 | } else { | |
1039 | /* y- still on; turn on only y+ (and ADC) */ | |
1040 | packet->read_y = READ_Y(vref); | |
1041 | x->tx_buf = &packet->read_y; | |
1042 | x->len = 1; | |
1043 | spi_message_add_tail(x, m); | |
d93f70b2 | 1044 | |
3eac5c7e AG |
1045 | x++; |
1046 | x->rx_buf = &packet->tc.y; | |
1047 | x->len = 2; | |
1048 | spi_message_add_tail(x, m); | |
1049 | } | |
0b7018aa | 1050 | |
2991a1ca JW |
1051 | /* |
1052 | * The first sample after switching drivers can be low quality; | |
e4f48861 SH |
1053 | * optionally discard it, using a second one after the signals |
1054 | * have had enough time to stabilize. | |
1055 | */ | |
1056 | if (pdata->settle_delay_usecs) { | |
1057 | x->delay_usecs = pdata->settle_delay_usecs; | |
1058 | ||
1059 | x++; | |
e8f462d2 | 1060 | x->tx_buf = &packet->read_y; |
e4f48861 SH |
1061 | x->len = 1; |
1062 | spi_message_add_tail(x, m); | |
1063 | ||
1064 | x++; | |
e8f462d2 | 1065 | x->rx_buf = &packet->tc.y; |
e4f48861 SH |
1066 | x->len = 2; |
1067 | spi_message_add_tail(x, m); | |
1068 | } | |
1069 | ||
2991a1ca | 1070 | ts->msg_count++; |
0b7018aa ID |
1071 | m++; |
1072 | spi_message_init(m); | |
2991a1ca | 1073 | m->context = ts; |
0b7018aa | 1074 | |
3eac5c7e AG |
1075 | if (ts->model == 7845) { |
1076 | x++; | |
1077 | packet->read_x_cmd[0] = READ_X(vref); | |
1078 | packet->read_x_cmd[1] = 0; | |
1079 | packet->read_x_cmd[2] = 0; | |
1080 | x->tx_buf = &packet->read_x_cmd[0]; | |
1081 | x->rx_buf = &packet->tc.x_buf[0]; | |
1082 | x->len = 3; | |
1083 | spi_message_add_tail(x, m); | |
1084 | } else { | |
1085 | /* turn y- off, x+ on, then leave in lowpower */ | |
1086 | x++; | |
1087 | packet->read_x = READ_X(vref); | |
1088 | x->tx_buf = &packet->read_x; | |
1089 | x->len = 1; | |
1090 | spi_message_add_tail(x, m); | |
0b7018aa | 1091 | |
3eac5c7e AG |
1092 | x++; |
1093 | x->rx_buf = &packet->tc.x; | |
1094 | x->len = 2; | |
1095 | spi_message_add_tail(x, m); | |
1096 | } | |
0b7018aa | 1097 | |
e4f48861 SH |
1098 | /* ... maybe discard first sample ... */ |
1099 | if (pdata->settle_delay_usecs) { | |
1100 | x->delay_usecs = pdata->settle_delay_usecs; | |
1101 | ||
1102 | x++; | |
e8f462d2 | 1103 | x->tx_buf = &packet->read_x; |
e4f48861 SH |
1104 | x->len = 1; |
1105 | spi_message_add_tail(x, m); | |
1106 | ||
1107 | x++; | |
e8f462d2 | 1108 | x->rx_buf = &packet->tc.x; |
e4f48861 SH |
1109 | x->len = 2; |
1110 | spi_message_add_tail(x, m); | |
1111 | } | |
1112 | ||
ffa458c1 DB |
1113 | /* turn y+ off, x- on; we'll use formula #2 */ |
1114 | if (ts->model == 7846) { | |
2991a1ca | 1115 | ts->msg_count++; |
0b7018aa ID |
1116 | m++; |
1117 | spi_message_init(m); | |
2991a1ca | 1118 | m->context = ts; |
0b7018aa | 1119 | |
d93f70b2 | 1120 | x++; |
e8f462d2 DT |
1121 | packet->read_z1 = READ_Z1(vref); |
1122 | x->tx_buf = &packet->read_z1; | |
ffa458c1 | 1123 | x->len = 1; |
0b7018aa | 1124 | spi_message_add_tail(x, m); |
d93f70b2 | 1125 | |
ffa458c1 | 1126 | x++; |
e8f462d2 | 1127 | x->rx_buf = &packet->tc.z1; |
ffa458c1 | 1128 | x->len = 2; |
0b7018aa ID |
1129 | spi_message_add_tail(x, m); |
1130 | ||
e4f48861 SH |
1131 | /* ... maybe discard first sample ... */ |
1132 | if (pdata->settle_delay_usecs) { | |
1133 | x->delay_usecs = pdata->settle_delay_usecs; | |
1134 | ||
1135 | x++; | |
e8f462d2 | 1136 | x->tx_buf = &packet->read_z1; |
e4f48861 SH |
1137 | x->len = 1; |
1138 | spi_message_add_tail(x, m); | |
1139 | ||
1140 | x++; | |
e8f462d2 | 1141 | x->rx_buf = &packet->tc.z1; |
e4f48861 SH |
1142 | x->len = 2; |
1143 | spi_message_add_tail(x, m); | |
1144 | } | |
1145 | ||
2991a1ca | 1146 | ts->msg_count++; |
0b7018aa ID |
1147 | m++; |
1148 | spi_message_init(m); | |
2991a1ca | 1149 | m->context = ts; |
ffa458c1 | 1150 | |
d93f70b2 | 1151 | x++; |
e8f462d2 DT |
1152 | packet->read_z2 = READ_Z2(vref); |
1153 | x->tx_buf = &packet->read_z2; | |
ffa458c1 | 1154 | x->len = 1; |
0b7018aa | 1155 | spi_message_add_tail(x, m); |
d93f70b2 | 1156 | |
ffa458c1 | 1157 | x++; |
e8f462d2 | 1158 | x->rx_buf = &packet->tc.z2; |
ffa458c1 | 1159 | x->len = 2; |
0b7018aa | 1160 | spi_message_add_tail(x, m); |
ffa458c1 | 1161 | |
e4f48861 SH |
1162 | /* ... maybe discard first sample ... */ |
1163 | if (pdata->settle_delay_usecs) { | |
1164 | x->delay_usecs = pdata->settle_delay_usecs; | |
1165 | ||
1166 | x++; | |
e8f462d2 | 1167 | x->tx_buf = &packet->read_z2; |
e4f48861 SH |
1168 | x->len = 1; |
1169 | spi_message_add_tail(x, m); | |
1170 | ||
1171 | x++; | |
e8f462d2 | 1172 | x->rx_buf = &packet->tc.z2; |
e4f48861 SH |
1173 | x->len = 2; |
1174 | spi_message_add_tail(x, m); | |
1175 | } | |
0b7018aa | 1176 | } |
53a0ef89 ID |
1177 | |
1178 | /* power down */ | |
2991a1ca | 1179 | ts->msg_count++; |
0b7018aa ID |
1180 | m++; |
1181 | spi_message_init(m); | |
2991a1ca | 1182 | m->context = ts; |
0b7018aa | 1183 | |
3eac5c7e AG |
1184 | if (ts->model == 7845) { |
1185 | x++; | |
1186 | packet->pwrdown_cmd[0] = PWRDOWN; | |
1187 | packet->pwrdown_cmd[1] = 0; | |
1188 | packet->pwrdown_cmd[2] = 0; | |
1189 | x->tx_buf = &packet->pwrdown_cmd[0]; | |
1190 | x->len = 3; | |
1191 | } else { | |
1192 | x++; | |
1193 | packet->pwrdown = PWRDOWN; | |
1194 | x->tx_buf = &packet->pwrdown; | |
1195 | x->len = 1; | |
1196 | spi_message_add_tail(x, m); | |
1197 | ||
1198 | x++; | |
1199 | x->rx_buf = &packet->dummy; | |
1200 | x->len = 2; | |
1201 | } | |
53a0ef89 | 1202 | |
d93f70b2 | 1203 | CS_CHANGE(*x); |
0b7018aa | 1204 | spi_message_add_tail(x, m); |
2991a1ca | 1205 | } |
ffa458c1 | 1206 | |
a608026e DM |
1207 | #ifdef CONFIG_OF |
1208 | static const struct of_device_id ads7846_dt_ids[] = { | |
1209 | { .compatible = "ti,tsc2046", .data = (void *) 7846 }, | |
1210 | { .compatible = "ti,ads7843", .data = (void *) 7843 }, | |
1211 | { .compatible = "ti,ads7845", .data = (void *) 7845 }, | |
1212 | { .compatible = "ti,ads7846", .data = (void *) 7846 }, | |
1213 | { .compatible = "ti,ads7873", .data = (void *) 7873 }, | |
1214 | { } | |
1215 | }; | |
1216 | MODULE_DEVICE_TABLE(of, ads7846_dt_ids); | |
1217 | ||
1218 | static const struct ads7846_platform_data *ads7846_probe_dt(struct device *dev) | |
1219 | { | |
1220 | struct ads7846_platform_data *pdata; | |
1221 | struct device_node *node = dev->of_node; | |
1222 | const struct of_device_id *match; | |
1223 | ||
1224 | if (!node) { | |
1225 | dev_err(dev, "Device does not have associated DT data\n"); | |
1226 | return ERR_PTR(-EINVAL); | |
1227 | } | |
1228 | ||
1229 | match = of_match_device(ads7846_dt_ids, dev); | |
1230 | if (!match) { | |
1231 | dev_err(dev, "Unknown device model\n"); | |
1232 | return ERR_PTR(-EINVAL); | |
1233 | } | |
1234 | ||
1235 | pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); | |
1236 | if (!pdata) | |
1237 | return ERR_PTR(-ENOMEM); | |
1238 | ||
1239 | pdata->model = (unsigned long)match->data; | |
1240 | ||
1241 | of_property_read_u16(node, "ti,vref-delay-usecs", | |
1242 | &pdata->vref_delay_usecs); | |
1243 | of_property_read_u16(node, "ti,vref-mv", &pdata->vref_mv); | |
1244 | pdata->keep_vref_on = of_property_read_bool(node, "ti,keep-vref-on"); | |
1245 | ||
1246 | pdata->swap_xy = of_property_read_bool(node, "ti,swap-xy"); | |
1247 | ||
1248 | of_property_read_u16(node, "ti,settle-delay-usec", | |
1249 | &pdata->settle_delay_usecs); | |
1250 | of_property_read_u16(node, "ti,penirq-recheck-delay-usecs", | |
1251 | &pdata->penirq_recheck_delay_usecs); | |
1252 | ||
1253 | of_property_read_u16(node, "ti,x-plate-ohms", &pdata->x_plate_ohms); | |
1254 | of_property_read_u16(node, "ti,y-plate-ohms", &pdata->y_plate_ohms); | |
1255 | ||
1256 | of_property_read_u16(node, "ti,x-min", &pdata->x_min); | |
1257 | of_property_read_u16(node, "ti,y-min", &pdata->y_min); | |
1258 | of_property_read_u16(node, "ti,x-max", &pdata->x_max); | |
1259 | of_property_read_u16(node, "ti,y-max", &pdata->y_max); | |
1260 | ||
1261 | of_property_read_u16(node, "ti,pressure-min", &pdata->pressure_min); | |
1262 | of_property_read_u16(node, "ti,pressure-max", &pdata->pressure_max); | |
1263 | ||
1264 | of_property_read_u16(node, "ti,debounce-max", &pdata->debounce_max); | |
1265 | of_property_read_u16(node, "ti,debounce-tol", &pdata->debounce_tol); | |
1266 | of_property_read_u16(node, "ti,debounce-rep", &pdata->debounce_rep); | |
1267 | ||
1268 | of_property_read_u32(node, "ti,pendown-gpio-debounce", | |
1269 | &pdata->gpio_pendown_debounce); | |
1270 | ||
1271 | pdata->wakeup = of_property_read_bool(node, "linux,wakeup"); | |
1272 | ||
1273 | pdata->gpio_pendown = of_get_named_gpio(dev->of_node, "pendown-gpio", 0); | |
1274 | ||
1275 | return pdata; | |
1276 | } | |
1277 | #else | |
1278 | static const struct ads7846_platform_data *ads7846_probe_dt(struct device *dev) | |
1279 | { | |
1280 | dev_err(dev, "no platform data defined\n"); | |
1281 | return ERR_PTR(-EINVAL); | |
1282 | } | |
1283 | #endif | |
1284 | ||
5298cc4c | 1285 | static int ads7846_probe(struct spi_device *spi) |
2991a1ca | 1286 | { |
a608026e | 1287 | const struct ads7846_platform_data *pdata; |
2991a1ca JW |
1288 | struct ads7846 *ts; |
1289 | struct ads7846_packet *packet; | |
1290 | struct input_dev *input_dev; | |
2991a1ca JW |
1291 | unsigned long irq_flags; |
1292 | int err; | |
1293 | ||
1294 | if (!spi->irq) { | |
1295 | dev_dbg(&spi->dev, "no IRQ?\n"); | |
a608026e | 1296 | return -EINVAL; |
2991a1ca JW |
1297 | } |
1298 | ||
1299 | /* don't exceed max specified sample rate */ | |
1300 | if (spi->max_speed_hz > (125000 * SAMPLE_BITS)) { | |
a608026e | 1301 | dev_err(&spi->dev, "f(sample) %d KHz?\n", |
2991a1ca JW |
1302 | (spi->max_speed_hz/SAMPLE_BITS)/1000); |
1303 | return -EINVAL; | |
1304 | } | |
1305 | ||
a608026e DM |
1306 | /* |
1307 | * We'd set TX word size 8 bits and RX word size to 13 bits ... except | |
2991a1ca JW |
1308 | * that even if the hardware can do that, the SPI controller driver |
1309 | * may not. So we stick to very-portable 8 bit words, both RX and TX. | |
1310 | */ | |
1311 | spi->bits_per_word = 8; | |
1312 | spi->mode = SPI_MODE_0; | |
1313 | err = spi_setup(spi); | |
1314 | if (err < 0) | |
1315 | return err; | |
ffa458c1 | 1316 | |
2991a1ca JW |
1317 | ts = kzalloc(sizeof(struct ads7846), GFP_KERNEL); |
1318 | packet = kzalloc(sizeof(struct ads7846_packet), GFP_KERNEL); | |
1319 | input_dev = input_allocate_device(); | |
1320 | if (!ts || !packet || !input_dev) { | |
1321 | err = -ENOMEM; | |
1322 | goto err_free_mem; | |
1323 | } | |
1324 | ||
c12454fa | 1325 | spi_set_drvdata(spi, ts); |
2991a1ca JW |
1326 | |
1327 | ts->packet = packet; | |
1328 | ts->spi = spi; | |
1329 | ts->input = input_dev; | |
2991a1ca JW |
1330 | |
1331 | mutex_init(&ts->lock); | |
1332 | init_waitqueue_head(&ts->wait); | |
1333 | ||
a608026e DM |
1334 | pdata = dev_get_platdata(&spi->dev); |
1335 | if (!pdata) { | |
1336 | pdata = ads7846_probe_dt(&spi->dev); | |
1337 | if (IS_ERR(pdata)) | |
1338 | return PTR_ERR(pdata); | |
1339 | } | |
1340 | ||
2991a1ca JW |
1341 | ts->model = pdata->model ? : 7846; |
1342 | ts->vref_delay_usecs = pdata->vref_delay_usecs ? : 100; | |
1343 | ts->x_plate_ohms = pdata->x_plate_ohms ? : 400; | |
1344 | ts->pressure_max = pdata->pressure_max ? : ~0; | |
1345 | ||
a608026e DM |
1346 | ts->vref_mv = pdata->vref_mv; |
1347 | ts->swap_xy = pdata->swap_xy; | |
1348 | ||
2991a1ca JW |
1349 | if (pdata->filter != NULL) { |
1350 | if (pdata->filter_init != NULL) { | |
1351 | err = pdata->filter_init(pdata, &ts->filter_data); | |
1352 | if (err < 0) | |
1353 | goto err_free_mem; | |
1354 | } | |
1355 | ts->filter = pdata->filter; | |
1356 | ts->filter_cleanup = pdata->filter_cleanup; | |
1357 | } else if (pdata->debounce_max) { | |
1358 | ts->debounce_max = pdata->debounce_max; | |
1359 | if (ts->debounce_max < 2) | |
1360 | ts->debounce_max = 2; | |
1361 | ts->debounce_tol = pdata->debounce_tol; | |
1362 | ts->debounce_rep = pdata->debounce_rep; | |
1363 | ts->filter = ads7846_debounce_filter; | |
1364 | ts->filter_data = ts; | |
1365 | } else { | |
1366 | ts->filter = ads7846_no_filter; | |
1367 | } | |
1368 | ||
57691a1e | 1369 | err = ads7846_setup_pendown(spi, ts, pdata); |
2991a1ca JW |
1370 | if (err) |
1371 | goto err_cleanup_filter; | |
1372 | ||
1373 | if (pdata->penirq_recheck_delay_usecs) | |
1374 | ts->penirq_recheck_delay_usecs = | |
1375 | pdata->penirq_recheck_delay_usecs; | |
1376 | ||
1377 | ts->wait_for_sync = pdata->wait_for_sync ? : null_wait_for_sync; | |
1378 | ||
1379 | snprintf(ts->phys, sizeof(ts->phys), "%s/input0", dev_name(&spi->dev)); | |
1380 | snprintf(ts->name, sizeof(ts->name), "ADS%d Touchscreen", ts->model); | |
1381 | ||
1382 | input_dev->name = ts->name; | |
1383 | input_dev->phys = ts->phys; | |
1384 | input_dev->dev.parent = &spi->dev; | |
1385 | ||
1386 | input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS); | |
1387 | input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH); | |
1388 | input_set_abs_params(input_dev, ABS_X, | |
1389 | pdata->x_min ? : 0, | |
1390 | pdata->x_max ? : MAX_12BIT, | |
1391 | 0, 0); | |
1392 | input_set_abs_params(input_dev, ABS_Y, | |
1393 | pdata->y_min ? : 0, | |
1394 | pdata->y_max ? : MAX_12BIT, | |
1395 | 0, 0); | |
1396 | input_set_abs_params(input_dev, ABS_PRESSURE, | |
1397 | pdata->pressure_min, pdata->pressure_max, 0, 0); | |
1398 | ||
1399 | ads7846_setup_spi_msg(ts, pdata); | |
d5b415c9 | 1400 | |
91143379 GI |
1401 | ts->reg = regulator_get(&spi->dev, "vcc"); |
1402 | if (IS_ERR(ts->reg)) { | |
067fb2f6 | 1403 | err = PTR_ERR(ts->reg); |
56960b36 | 1404 | dev_err(&spi->dev, "unable to get regulator: %d\n", err); |
91143379 GI |
1405 | goto err_free_gpio; |
1406 | } | |
1407 | ||
1408 | err = regulator_enable(ts->reg); | |
1409 | if (err) { | |
1410 | dev_err(&spi->dev, "unable to enable regulator: %d\n", err); | |
1411 | goto err_put_regulator; | |
1412 | } | |
1413 | ||
0f622bf4 | 1414 | irq_flags = pdata->irq_flags ? : IRQF_TRIGGER_FALLING; |
2991a1ca | 1415 | irq_flags |= IRQF_ONESHOT; |
7804302b | 1416 | |
2991a1ca JW |
1417 | err = request_threaded_irq(spi->irq, ads7846_hard_irq, ads7846_irq, |
1418 | irq_flags, spi->dev.driver->name, ts); | |
0f622bf4 | 1419 | if (err && !pdata->irq_flags) { |
c57c0a2a MR |
1420 | dev_info(&spi->dev, |
1421 | "trying pin change workaround on irq %d\n", spi->irq); | |
2991a1ca JW |
1422 | irq_flags |= IRQF_TRIGGER_RISING; |
1423 | err = request_threaded_irq(spi->irq, | |
1424 | ads7846_hard_irq, ads7846_irq, | |
1425 | irq_flags, spi->dev.driver->name, ts); | |
0f622bf4 DT |
1426 | } |
1427 | ||
1428 | if (err) { | |
1429 | dev_dbg(&spi->dev, "irq %d busy?\n", spi->irq); | |
1430 | goto err_disable_regulator; | |
ffa458c1 | 1431 | } |
ffa458c1 | 1432 | |
2c8dc071 DB |
1433 | err = ads784x_hwmon_register(spi, ts); |
1434 | if (err) | |
1435 | goto err_free_irq; | |
1436 | ||
2e5a7bd9 | 1437 | dev_info(&spi->dev, "touchscreen, irq %d\n", spi->irq); |
ffa458c1 | 1438 | |
2991a1ca JW |
1439 | /* |
1440 | * Take a first sample, leaving nPENIRQ active and vREF off; avoid | |
ffa458c1 DB |
1441 | * the touchscreen, in case it's not connected. |
1442 | */ | |
3eac5c7e AG |
1443 | if (ts->model == 7845) |
1444 | ads7845_read12_ser(&spi->dev, PWRDOWN); | |
1445 | else | |
ebcaaad9 | 1446 | (void) ads7846_read12_ser(&spi->dev, READ_12BIT_SER(vaux)); |
ffa458c1 | 1447 | |
2c8dc071 | 1448 | err = sysfs_create_group(&spi->dev.kobj, &ads784x_attr_group); |
8dd51650 | 1449 | if (err) |
2c8dc071 | 1450 | goto err_remove_hwmon; |
7de90a8c | 1451 | |
a90f7e98 DT |
1452 | err = input_register_device(input_dev); |
1453 | if (err) | |
8dd51650 | 1454 | goto err_remove_attr_group; |
a90f7e98 | 1455 | |
fdba2bb1 RL |
1456 | device_init_wakeup(&spi->dev, pdata->wakeup); |
1457 | ||
a608026e DM |
1458 | /* |
1459 | * If device does not carry platform data we must have allocated it | |
1460 | * when parsing DT data. | |
1461 | */ | |
1462 | if (!dev_get_platdata(&spi->dev)) | |
1463 | devm_kfree(&spi->dev, (void *)pdata); | |
1464 | ||
ffa458c1 | 1465 | return 0; |
a90f7e98 | 1466 | |
8dd51650 | 1467 | err_remove_attr_group: |
2c8dc071 DB |
1468 | sysfs_remove_group(&spi->dev.kobj, &ads784x_attr_group); |
1469 | err_remove_hwmon: | |
1470 | ads784x_hwmon_unregister(spi, ts); | |
8dd51650 | 1471 | err_free_irq: |
a90f7e98 | 1472 | free_irq(spi->irq, ts); |
91143379 GI |
1473 | err_disable_regulator: |
1474 | regulator_disable(ts->reg); | |
1475 | err_put_regulator: | |
1476 | regulator_put(ts->reg); | |
4d5975e5 | 1477 | err_free_gpio: |
0fbc9fdb | 1478 | if (!ts->get_pendown_state) |
4d5975e5 | 1479 | gpio_free(ts->gpio_pendown); |
da970e69 ID |
1480 | err_cleanup_filter: |
1481 | if (ts->filter_cleanup) | |
1482 | ts->filter_cleanup(ts->filter_data); | |
a90f7e98 DT |
1483 | err_free_mem: |
1484 | input_free_device(input_dev); | |
e8f462d2 | 1485 | kfree(packet); |
a90f7e98 DT |
1486 | kfree(ts); |
1487 | return err; | |
ffa458c1 DB |
1488 | } |
1489 | ||
e2619cf7 | 1490 | static int ads7846_remove(struct spi_device *spi) |
ffa458c1 | 1491 | { |
c12454fa | 1492 | struct ads7846 *ts = spi_get_drvdata(spi); |
ffa458c1 | 1493 | |
fdba2bb1 RL |
1494 | device_init_wakeup(&spi->dev, false); |
1495 | ||
2c8dc071 | 1496 | sysfs_remove_group(&spi->dev.kobj, &ads784x_attr_group); |
ffa458c1 | 1497 | |
2991a1ca | 1498 | ads7846_disable(ts); |
7de90a8c | 1499 | free_irq(ts->spi->irq, ts); |
2991a1ca JW |
1500 | |
1501 | input_unregister_device(ts->input); | |
1502 | ||
1503 | ads784x_hwmon_unregister(spi, ts); | |
7de90a8c | 1504 | |
91143379 GI |
1505 | regulator_disable(ts->reg); |
1506 | regulator_put(ts->reg); | |
1507 | ||
0fbc9fdb DT |
1508 | if (!ts->get_pendown_state) { |
1509 | /* | |
1510 | * If we are not using specialized pendown method we must | |
1511 | * have been relying on gpio we set up ourselves. | |
1512 | */ | |
4d5975e5 | 1513 | gpio_free(ts->gpio_pendown); |
0fbc9fdb | 1514 | } |
4d5975e5 | 1515 | |
da970e69 ID |
1516 | if (ts->filter_cleanup) |
1517 | ts->filter_cleanup(ts->filter_data); | |
1518 | ||
e8f462d2 | 1519 | kfree(ts->packet); |
ffa458c1 DB |
1520 | kfree(ts); |
1521 | ||
2e5a7bd9 | 1522 | dev_dbg(&spi->dev, "unregistered touchscreen\n"); |
2991a1ca | 1523 | |
ffa458c1 DB |
1524 | return 0; |
1525 | } | |
1526 | ||
2e5a7bd9 DB |
1527 | static struct spi_driver ads7846_driver = { |
1528 | .driver = { | |
1529 | .name = "ads7846", | |
2e5a7bd9 | 1530 | .owner = THIS_MODULE, |
3c36e719 | 1531 | .pm = &ads7846_pm, |
a608026e | 1532 | .of_match_table = of_match_ptr(ads7846_dt_ids), |
2e5a7bd9 | 1533 | }, |
ffa458c1 | 1534 | .probe = ads7846_probe, |
1cb0aa88 | 1535 | .remove = ads7846_remove, |
ffa458c1 DB |
1536 | }; |
1537 | ||
ca83922e | 1538 | module_spi_driver(ads7846_driver); |
ffa458c1 DB |
1539 | |
1540 | MODULE_DESCRIPTION("ADS7846 TouchScreen Driver"); | |
1541 | MODULE_LICENSE("GPL"); | |
e0626e38 | 1542 | MODULE_ALIAS("spi:ads7846"); |