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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
ffa458c1 DB |
2 | /* |
3 | * ADS7846 based touchscreen and sensor driver | |
4 | * | |
5 | * Copyright (c) 2005 David Brownell | |
7de90a8c ID |
6 | * Copyright (c) 2006 Nokia Corporation |
7 | * Various changes: Imre Deak <imre.deak@nokia.com> | |
ffa458c1 DB |
8 | * |
9 | * Using code from: | |
10 | * - corgi_ts.c | |
11 | * Copyright (C) 2004-2005 Richard Purdie | |
12 | * - omap_ts.[hc], ads7846.h, ts_osk.c | |
13 | * Copyright (C) 2002 MontaVista Software | |
14 | * Copyright (C) 2004 Texas Instruments | |
15 | * Copyright (C) 2005 Dirk Behme | |
ffa458c1 | 16 | */ |
2991a1ca | 17 | #include <linux/types.h> |
2c8dc071 | 18 | #include <linux/hwmon.h> |
2c8dc071 | 19 | #include <linux/err.h> |
2991a1ca | 20 | #include <linux/sched.h> |
ffa458c1 DB |
21 | #include <linux/delay.h> |
22 | #include <linux/input.h> | |
23 | #include <linux/interrupt.h> | |
24 | #include <linux/slab.h> | |
3c36e719 | 25 | #include <linux/pm.h> |
a608026e DM |
26 | #include <linux/of.h> |
27 | #include <linux/of_gpio.h> | |
28 | #include <linux/of_device.h> | |
4d5975e5 | 29 | #include <linux/gpio.h> |
ffa458c1 DB |
30 | #include <linux/spi/spi.h> |
31 | #include <linux/spi/ads7846.h> | |
91143379 | 32 | #include <linux/regulator/consumer.h> |
d2d8442d | 33 | #include <linux/module.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 | 99 | |
c52b4fc7 | 100 | #if IS_ENABLED(CONFIG_HWMON) |
1beeffe4 | 101 | struct device *hwmon; |
2c8dc071 DB |
102 | #endif |
103 | ||
ffa458c1 | 104 | u16 model; |
7c6d0ee1 | 105 | u16 vref_mv; |
ffa458c1 DB |
106 | u16 vref_delay_usecs; |
107 | u16 x_plate_ohms; | |
d5b415c9 | 108 | u16 pressure_max; |
ffa458c1 | 109 | |
86579a4c | 110 | bool swap_xy; |
ebcaaad9 | 111 | bool use_internal; |
86579a4c | 112 | |
e8f462d2 | 113 | struct ads7846_packet *packet; |
ffa458c1 | 114 | |
e4f48861 | 115 | struct spi_transfer xfer[18]; |
0b7018aa | 116 | struct spi_message msg[5]; |
2991a1ca JW |
117 | int msg_count; |
118 | wait_queue_head_t wait; | |
119 | ||
120 | bool pendown; | |
121 | ||
0b7018aa | 122 | int read_cnt; |
d5b415c9 | 123 | int read_rep; |
0b7018aa ID |
124 | int last_read; |
125 | ||
126 | u16 debounce_max; | |
127 | u16 debounce_tol; | |
d5b415c9 | 128 | u16 debounce_rep; |
ffa458c1 | 129 | |
1d25891f SH |
130 | u16 penirq_recheck_delay_usecs; |
131 | ||
2991a1ca JW |
132 | struct mutex lock; |
133 | bool stopped; /* P: lock */ | |
134 | bool disabled; /* P: lock */ | |
135 | bool suspended; /* P: lock */ | |
c9e617a5 | 136 | |
da970e69 ID |
137 | int (*filter)(void *data, int data_idx, int *val); |
138 | void *filter_data; | |
139 | void (*filter_cleanup)(void *data); | |
c9e617a5 | 140 | int (*get_pendown_state)(void); |
4d5975e5 | 141 | int gpio_pendown; |
fd746d54 EM |
142 | |
143 | void (*wait_for_sync)(void); | |
ffa458c1 DB |
144 | }; |
145 | ||
146 | /* leave chip selected when we're done, for quicker re-select? */ | |
147 | #if 0 | |
148 | #define CS_CHANGE(xfer) ((xfer).cs_change = 1) | |
149 | #else | |
150 | #define CS_CHANGE(xfer) ((xfer).cs_change = 0) | |
151 | #endif | |
152 | ||
153 | /*--------------------------------------------------------------------------*/ | |
154 | ||
155 | /* The ADS7846 has touchscreen and other sensors. | |
156 | * Earlier ads784x chips are somewhat compatible. | |
157 | */ | |
158 | #define ADS_START (1 << 7) | |
159 | #define ADS_A2A1A0_d_y (1 << 4) /* differential */ | |
160 | #define ADS_A2A1A0_d_z1 (3 << 4) /* differential */ | |
161 | #define ADS_A2A1A0_d_z2 (4 << 4) /* differential */ | |
162 | #define ADS_A2A1A0_d_x (5 << 4) /* differential */ | |
163 | #define ADS_A2A1A0_temp0 (0 << 4) /* non-differential */ | |
164 | #define ADS_A2A1A0_vbatt (2 << 4) /* non-differential */ | |
165 | #define ADS_A2A1A0_vaux (6 << 4) /* non-differential */ | |
166 | #define ADS_A2A1A0_temp1 (7 << 4) /* non-differential */ | |
167 | #define ADS_8_BIT (1 << 3) | |
168 | #define ADS_12_BIT (0 << 3) | |
169 | #define ADS_SER (1 << 2) /* non-differential */ | |
170 | #define ADS_DFR (0 << 2) /* differential */ | |
2991a1ca | 171 | #define ADS_PD10_PDOWN (0 << 0) /* low power mode + penirq */ |
ffa458c1 DB |
172 | #define ADS_PD10_ADC_ON (1 << 0) /* ADC on */ |
173 | #define ADS_PD10_REF_ON (2 << 0) /* vREF on + penirq */ | |
174 | #define ADS_PD10_ALL_ON (3 << 0) /* ADC + vREF on */ | |
175 | ||
176 | #define MAX_12BIT ((1<<12)-1) | |
177 | ||
178 | /* leave ADC powered up (disables penirq) between differential samples */ | |
de2defd9 ID |
179 | #define READ_12BIT_DFR(x, adc, vref) (ADS_START | ADS_A2A1A0_d_ ## x \ |
180 | | ADS_12_BIT | ADS_DFR | \ | |
181 | (adc ? ADS_PD10_ADC_ON : 0) | (vref ? ADS_PD10_REF_ON : 0)) | |
ffa458c1 | 182 | |
de2defd9 ID |
183 | #define READ_Y(vref) (READ_12BIT_DFR(y, 1, vref)) |
184 | #define READ_Z1(vref) (READ_12BIT_DFR(z1, 1, vref)) | |
185 | #define READ_Z2(vref) (READ_12BIT_DFR(z2, 1, vref)) | |
53a0ef89 | 186 | |
de2defd9 ID |
187 | #define READ_X(vref) (READ_12BIT_DFR(x, 1, vref)) |
188 | #define PWRDOWN (READ_12BIT_DFR(y, 0, 0)) /* LAST */ | |
ffa458c1 DB |
189 | |
190 | /* single-ended samples need to first power up reference voltage; | |
191 | * we leave both ADC and VREF powered | |
192 | */ | |
193 | #define READ_12BIT_SER(x) (ADS_START | ADS_A2A1A0_ ## x \ | |
194 | | ADS_12_BIT | ADS_SER) | |
195 | ||
de2defd9 ID |
196 | #define REF_ON (READ_12BIT_DFR(x, 1, 1)) |
197 | #define REF_OFF (READ_12BIT_DFR(y, 0, 0)) | |
ffa458c1 | 198 | |
2991a1ca JW |
199 | /* Must be called with ts->lock held */ |
200 | static void ads7846_stop(struct ads7846 *ts) | |
201 | { | |
202 | if (!ts->disabled && !ts->suspended) { | |
203 | /* Signal IRQ thread to stop polling and disable the handler. */ | |
204 | ts->stopped = true; | |
205 | mb(); | |
206 | wake_up(&ts->wait); | |
207 | disable_irq(ts->spi->irq); | |
208 | } | |
209 | } | |
210 | ||
211 | /* Must be called with ts->lock held */ | |
212 | static void ads7846_restart(struct ads7846 *ts) | |
213 | { | |
214 | if (!ts->disabled && !ts->suspended) { | |
215 | /* Tell IRQ thread that it may poll the device. */ | |
216 | ts->stopped = false; | |
217 | mb(); | |
218 | enable_irq(ts->spi->irq); | |
219 | } | |
220 | } | |
221 | ||
222 | /* Must be called with ts->lock held */ | |
223 | static void __ads7846_disable(struct ads7846 *ts) | |
224 | { | |
225 | ads7846_stop(ts); | |
226 | regulator_disable(ts->reg); | |
227 | ||
228 | /* | |
229 | * We know the chip's in low power mode since we always | |
230 | * leave it that way after every request | |
231 | */ | |
232 | } | |
233 | ||
234 | /* Must be called with ts->lock held */ | |
235 | static void __ads7846_enable(struct ads7846 *ts) | |
236 | { | |
f94352f8 MB |
237 | int error; |
238 | ||
239 | error = regulator_enable(ts->reg); | |
240 | if (error != 0) | |
241 | dev_err(&ts->spi->dev, "Failed to enable supply: %d\n", error); | |
242 | ||
2991a1ca JW |
243 | ads7846_restart(ts); |
244 | } | |
245 | ||
246 | static void ads7846_disable(struct ads7846 *ts) | |
247 | { | |
248 | mutex_lock(&ts->lock); | |
249 | ||
250 | if (!ts->disabled) { | |
251 | ||
252 | if (!ts->suspended) | |
253 | __ads7846_disable(ts); | |
254 | ||
255 | ts->disabled = true; | |
256 | } | |
257 | ||
258 | mutex_unlock(&ts->lock); | |
259 | } | |
260 | ||
261 | static void ads7846_enable(struct ads7846 *ts) | |
262 | { | |
263 | mutex_lock(&ts->lock); | |
264 | ||
265 | if (ts->disabled) { | |
266 | ||
267 | ts->disabled = false; | |
268 | ||
269 | if (!ts->suspended) | |
270 | __ads7846_enable(ts); | |
271 | } | |
272 | ||
273 | mutex_unlock(&ts->lock); | |
274 | } | |
275 | ||
ffa458c1 DB |
276 | /*--------------------------------------------------------------------------*/ |
277 | ||
278 | /* | |
279 | * Non-touchscreen sensors only use single-ended conversions. | |
2c8dc071 DB |
280 | * The range is GND..vREF. The ads7843 and ads7835 must use external vREF; |
281 | * ads7846 lets that pin be unconnected, to use internal vREF. | |
ffa458c1 DB |
282 | */ |
283 | ||
284 | struct ser_req { | |
d93f70b2 | 285 | u8 ref_on; |
ffa458c1 | 286 | u8 command; |
d93f70b2 | 287 | u8 ref_off; |
ffa458c1 | 288 | u16 scratch; |
ffa458c1 DB |
289 | struct spi_message msg; |
290 | struct spi_transfer xfer[6]; | |
1dbe7dad AS |
291 | /* |
292 | * DMA (thus cache coherency maintenance) requires the | |
293 | * transfer buffers to live in their own cache lines. | |
294 | */ | |
295 | __be16 sample ____cacheline_aligned; | |
ffa458c1 DB |
296 | }; |
297 | ||
3eac5c7e AG |
298 | struct ads7845_ser_req { |
299 | u8 command[3]; | |
3eac5c7e AG |
300 | struct spi_message msg; |
301 | struct spi_transfer xfer[2]; | |
1dbe7dad AS |
302 | /* |
303 | * DMA (thus cache coherency maintenance) requires the | |
304 | * transfer buffers to live in their own cache lines. | |
305 | */ | |
306 | u8 sample[3] ____cacheline_aligned; | |
3eac5c7e AG |
307 | }; |
308 | ||
ffa458c1 DB |
309 | static int ads7846_read12_ser(struct device *dev, unsigned command) |
310 | { | |
2991a1ca JW |
311 | struct spi_device *spi = to_spi_device(dev); |
312 | struct ads7846 *ts = dev_get_drvdata(dev); | |
313 | struct ser_req *req; | |
314 | int status; | |
ffa458c1 | 315 | |
2991a1ca | 316 | req = kzalloc(sizeof *req, GFP_KERNEL); |
ffa458c1 DB |
317 | if (!req) |
318 | return -ENOMEM; | |
319 | ||
0b7018aa | 320 | spi_message_init(&req->msg); |
8275c642 | 321 | |
2c8dc071 | 322 | /* maybe turn on internal vREF, and let it settle */ |
ebcaaad9 | 323 | if (ts->use_internal) { |
2c8dc071 DB |
324 | req->ref_on = REF_ON; |
325 | req->xfer[0].tx_buf = &req->ref_on; | |
326 | req->xfer[0].len = 1; | |
327 | spi_message_add_tail(&req->xfer[0], &req->msg); | |
328 | ||
329 | req->xfer[1].rx_buf = &req->scratch; | |
330 | req->xfer[1].len = 2; | |
331 | ||
332 | /* for 1uF, settle for 800 usec; no cap, 100 usec. */ | |
333 | req->xfer[1].delay_usecs = ts->vref_delay_usecs; | |
334 | spi_message_add_tail(&req->xfer[1], &req->msg); | |
ebcaaad9 AS |
335 | |
336 | /* Enable reference voltage */ | |
337 | command |= ADS_PD10_REF_ON; | |
2c8dc071 | 338 | } |
ffa458c1 | 339 | |
ebcaaad9 AS |
340 | /* Enable ADC in every case */ |
341 | command |= ADS_PD10_ADC_ON; | |
342 | ||
ffa458c1 DB |
343 | /* take sample */ |
344 | req->command = (u8) command; | |
345 | req->xfer[2].tx_buf = &req->command; | |
346 | req->xfer[2].len = 1; | |
2c8dc071 DB |
347 | spi_message_add_tail(&req->xfer[2], &req->msg); |
348 | ||
ffa458c1 DB |
349 | req->xfer[3].rx_buf = &req->sample; |
350 | req->xfer[3].len = 2; | |
2c8dc071 | 351 | spi_message_add_tail(&req->xfer[3], &req->msg); |
ffa458c1 DB |
352 | |
353 | /* REVISIT: take a few more samples, and compare ... */ | |
354 | ||
969111e9 NF |
355 | /* converter in low power mode & enable PENIRQ */ |
356 | req->ref_off = PWRDOWN; | |
357 | req->xfer[4].tx_buf = &req->ref_off; | |
358 | req->xfer[4].len = 1; | |
359 | spi_message_add_tail(&req->xfer[4], &req->msg); | |
360 | ||
361 | req->xfer[5].rx_buf = &req->scratch; | |
362 | req->xfer[5].len = 2; | |
363 | CS_CHANGE(req->xfer[5]); | |
364 | spi_message_add_tail(&req->xfer[5], &req->msg); | |
ffa458c1 | 365 | |
2991a1ca JW |
366 | mutex_lock(&ts->lock); |
367 | ads7846_stop(ts); | |
ffa458c1 | 368 | status = spi_sync(spi, &req->msg); |
2991a1ca JW |
369 | ads7846_restart(ts); |
370 | mutex_unlock(&ts->lock); | |
ffa458c1 | 371 | |
c24b2602 MP |
372 | if (status == 0) { |
373 | /* on-wire is a must-ignore bit, a BE12 value, then padding */ | |
7c6d0ee1 DB |
374 | status = be16_to_cpu(req->sample); |
375 | status = status >> 3; | |
376 | status &= 0x0fff; | |
c24b2602 | 377 | } |
ffa458c1 | 378 | |
9084533e | 379 | kfree(req); |
7c6d0ee1 | 380 | return status; |
ffa458c1 DB |
381 | } |
382 | ||
3eac5c7e AG |
383 | static int ads7845_read12_ser(struct device *dev, unsigned command) |
384 | { | |
2991a1ca JW |
385 | struct spi_device *spi = to_spi_device(dev); |
386 | struct ads7846 *ts = dev_get_drvdata(dev); | |
387 | struct ads7845_ser_req *req; | |
388 | int status; | |
3eac5c7e | 389 | |
2991a1ca | 390 | req = kzalloc(sizeof *req, GFP_KERNEL); |
3eac5c7e AG |
391 | if (!req) |
392 | return -ENOMEM; | |
393 | ||
394 | spi_message_init(&req->msg); | |
395 | ||
396 | req->command[0] = (u8) command; | |
397 | req->xfer[0].tx_buf = req->command; | |
398 | req->xfer[0].rx_buf = req->sample; | |
399 | req->xfer[0].len = 3; | |
400 | spi_message_add_tail(&req->xfer[0], &req->msg); | |
401 | ||
2991a1ca JW |
402 | mutex_lock(&ts->lock); |
403 | ads7846_stop(ts); | |
3eac5c7e | 404 | status = spi_sync(spi, &req->msg); |
2991a1ca JW |
405 | ads7846_restart(ts); |
406 | mutex_unlock(&ts->lock); | |
3eac5c7e AG |
407 | |
408 | if (status == 0) { | |
409 | /* BE12 value, then padding */ | |
410 | status = be16_to_cpu(*((u16 *)&req->sample[1])); | |
411 | status = status >> 3; | |
412 | status &= 0x0fff; | |
413 | } | |
414 | ||
415 | kfree(req); | |
416 | return status; | |
417 | } | |
418 | ||
c52b4fc7 | 419 | #if IS_ENABLED(CONFIG_HWMON) |
2c8dc071 DB |
420 | |
421 | #define SHOW(name, var, adjust) static ssize_t \ | |
ffa458c1 DB |
422 | name ## _show(struct device *dev, struct device_attribute *attr, char *buf) \ |
423 | { \ | |
2c8dc071 | 424 | struct ads7846 *ts = dev_get_drvdata(dev); \ |
2fdf4cd9 | 425 | ssize_t v = ads7846_read12_ser(&ts->spi->dev, \ |
ebcaaad9 | 426 | READ_12BIT_SER(var)); \ |
ffa458c1 DB |
427 | if (v < 0) \ |
428 | return v; \ | |
2c8dc071 | 429 | return sprintf(buf, "%u\n", adjust(ts, v)); \ |
ffa458c1 DB |
430 | } \ |
431 | static DEVICE_ATTR(name, S_IRUGO, name ## _show, NULL); | |
432 | ||
2c8dc071 | 433 | |
b731d7b6 | 434 | /* Sysfs conventions report temperatures in millidegrees Celsius. |
2c8dc071 DB |
435 | * ADS7846 could use the low-accuracy two-sample scheme, but can't do the high |
436 | * accuracy scheme without calibration data. For now we won't try either; | |
437 | * userspace sees raw sensor values, and must scale/calibrate appropriately. | |
438 | */ | |
439 | static inline unsigned null_adjust(struct ads7846 *ts, ssize_t v) | |
440 | { | |
441 | return v; | |
442 | } | |
443 | ||
444 | SHOW(temp0, temp0, null_adjust) /* temp1_input */ | |
445 | SHOW(temp1, temp1, null_adjust) /* temp2_input */ | |
446 | ||
447 | ||
448 | /* sysfs conventions report voltages in millivolts. We can convert voltages | |
449 | * if we know vREF. userspace may need to scale vAUX to match the board's | |
450 | * external resistors; we assume that vBATT only uses the internal ones. | |
451 | */ | |
452 | static inline unsigned vaux_adjust(struct ads7846 *ts, ssize_t v) | |
453 | { | |
454 | unsigned retval = v; | |
455 | ||
456 | /* external resistors may scale vAUX into 0..vREF */ | |
7c6d0ee1 | 457 | retval *= ts->vref_mv; |
2c8dc071 | 458 | retval = retval >> 12; |
2991a1ca | 459 | |
2c8dc071 DB |
460 | return retval; |
461 | } | |
462 | ||
463 | static inline unsigned vbatt_adjust(struct ads7846 *ts, ssize_t v) | |
464 | { | |
465 | unsigned retval = vaux_adjust(ts, v); | |
466 | ||
467 | /* ads7846 has a resistor ladder to scale this signal down */ | |
468 | if (ts->model == 7846) | |
469 | retval *= 4; | |
2991a1ca | 470 | |
2c8dc071 DB |
471 | return retval; |
472 | } | |
473 | ||
474 | SHOW(in0_input, vaux, vaux_adjust) | |
475 | SHOW(in1_input, vbatt, vbatt_adjust) | |
476 | ||
e585c40b GR |
477 | static umode_t ads7846_is_visible(struct kobject *kobj, struct attribute *attr, |
478 | int index) | |
479 | { | |
480 | struct device *dev = container_of(kobj, struct device, kobj); | |
481 | struct ads7846 *ts = dev_get_drvdata(dev); | |
2c8dc071 | 482 | |
e585c40b GR |
483 | if (ts->model == 7843 && index < 2) /* in0, in1 */ |
484 | return 0; | |
485 | if (ts->model == 7845 && index != 2) /* in0 */ | |
486 | return 0; | |
2c8dc071 | 487 | |
e585c40b GR |
488 | return attr->mode; |
489 | } | |
2c8dc071 | 490 | |
e585c40b GR |
491 | static struct attribute *ads7846_attributes[] = { |
492 | &dev_attr_temp0.attr, /* 0 */ | |
493 | &dev_attr_temp1.attr, /* 1 */ | |
494 | &dev_attr_in0_input.attr, /* 2 */ | |
495 | &dev_attr_in1_input.attr, /* 3 */ | |
2c8dc071 DB |
496 | NULL, |
497 | }; | |
498 | ||
9e938dec | 499 | static const struct attribute_group ads7846_attr_group = { |
e585c40b GR |
500 | .attrs = ads7846_attributes, |
501 | .is_visible = ads7846_is_visible, | |
2c8dc071 | 502 | }; |
e585c40b | 503 | __ATTRIBUTE_GROUPS(ads7846_attr); |
2c8dc071 DB |
504 | |
505 | static int ads784x_hwmon_register(struct spi_device *spi, struct ads7846 *ts) | |
506 | { | |
2c8dc071 DB |
507 | /* hwmon sensors need a reference voltage */ |
508 | switch (ts->model) { | |
509 | case 7846: | |
7c6d0ee1 | 510 | if (!ts->vref_mv) { |
2c8dc071 | 511 | dev_dbg(&spi->dev, "assuming 2.5V internal vREF\n"); |
7c6d0ee1 | 512 | ts->vref_mv = 2500; |
ebcaaad9 | 513 | ts->use_internal = true; |
2c8dc071 DB |
514 | } |
515 | break; | |
516 | case 7845: | |
517 | case 7843: | |
7c6d0ee1 | 518 | if (!ts->vref_mv) { |
2c8dc071 DB |
519 | dev_warn(&spi->dev, |
520 | "external vREF for ADS%d not specified\n", | |
521 | ts->model); | |
522 | return 0; | |
523 | } | |
524 | break; | |
525 | } | |
526 | ||
e585c40b GR |
527 | ts->hwmon = hwmon_device_register_with_groups(&spi->dev, spi->modalias, |
528 | ts, ads7846_attr_groups); | |
2c8dc071 | 529 | |
c4517f82 | 530 | return PTR_ERR_OR_ZERO(ts->hwmon); |
2c8dc071 DB |
531 | } |
532 | ||
533 | static void ads784x_hwmon_unregister(struct spi_device *spi, | |
534 | struct ads7846 *ts) | |
535 | { | |
e585c40b | 536 | if (ts->hwmon) |
2c8dc071 | 537 | hwmon_device_unregister(ts->hwmon); |
2c8dc071 DB |
538 | } |
539 | ||
540 | #else | |
541 | static inline int ads784x_hwmon_register(struct spi_device *spi, | |
542 | struct ads7846 *ts) | |
543 | { | |
544 | return 0; | |
545 | } | |
546 | ||
547 | static inline void ads784x_hwmon_unregister(struct spi_device *spi, | |
548 | struct ads7846 *ts) | |
549 | { | |
550 | } | |
551 | #endif | |
ffa458c1 | 552 | |
438f2a74 ID |
553 | static ssize_t ads7846_pen_down_show(struct device *dev, |
554 | struct device_attribute *attr, char *buf) | |
555 | { | |
2991a1ca JW |
556 | struct ads7846 *ts = dev_get_drvdata(dev); |
557 | ||
558 | return sprintf(buf, "%u\n", ts->pendown); | |
438f2a74 ID |
559 | } |
560 | ||
561 | static DEVICE_ATTR(pen_down, S_IRUGO, ads7846_pen_down_show, NULL); | |
562 | ||
7de90a8c ID |
563 | static ssize_t ads7846_disable_show(struct device *dev, |
564 | struct device_attribute *attr, char *buf) | |
565 | { | |
2991a1ca | 566 | struct ads7846 *ts = dev_get_drvdata(dev); |
7de90a8c ID |
567 | |
568 | return sprintf(buf, "%u\n", ts->disabled); | |
569 | } | |
570 | ||
571 | static ssize_t ads7846_disable_store(struct device *dev, | |
572 | struct device_attribute *attr, | |
573 | const char *buf, size_t count) | |
574 | { | |
575 | struct ads7846 *ts = dev_get_drvdata(dev); | |
76496e7a JD |
576 | unsigned int i; |
577 | int err; | |
160f1fef | 578 | |
76496e7a JD |
579 | err = kstrtouint(buf, 10, &i); |
580 | if (err) | |
581 | return err; | |
7de90a8c | 582 | |
7de90a8c ID |
583 | if (i) |
584 | ads7846_disable(ts); | |
585 | else | |
586 | ads7846_enable(ts); | |
587 | ||
7de90a8c ID |
588 | return count; |
589 | } | |
590 | ||
591 | static DEVICE_ATTR(disable, 0664, ads7846_disable_show, ads7846_disable_store); | |
592 | ||
2c8dc071 | 593 | static struct attribute *ads784x_attributes[] = { |
8dd51650 DT |
594 | &dev_attr_pen_down.attr, |
595 | &dev_attr_disable.attr, | |
596 | NULL, | |
597 | }; | |
598 | ||
9e938dec | 599 | static const struct attribute_group ads784x_attr_group = { |
2c8dc071 | 600 | .attrs = ads784x_attributes, |
8dd51650 DT |
601 | }; |
602 | ||
ffa458c1 DB |
603 | /*--------------------------------------------------------------------------*/ |
604 | ||
4d5975e5 EM |
605 | static int get_pendown_state(struct ads7846 *ts) |
606 | { | |
607 | if (ts->get_pendown_state) | |
608 | return ts->get_pendown_state(); | |
609 | ||
610 | return !gpio_get_value(ts->gpio_pendown); | |
611 | } | |
612 | ||
fd746d54 EM |
613 | static void null_wait_for_sync(void) |
614 | { | |
615 | } | |
616 | ||
2991a1ca JW |
617 | static int ads7846_debounce_filter(void *ads, int data_idx, int *val) |
618 | { | |
619 | struct ads7846 *ts = ads; | |
620 | ||
621 | if (!ts->read_cnt || (abs(ts->last_read - *val) > ts->debounce_tol)) { | |
622 | /* Start over collecting consistent readings. */ | |
623 | ts->read_rep = 0; | |
624 | /* | |
625 | * Repeat it, if this was the first read or the read | |
626 | * wasn't consistent enough. | |
627 | */ | |
628 | if (ts->read_cnt < ts->debounce_max) { | |
629 | ts->last_read = *val; | |
630 | ts->read_cnt++; | |
631 | return ADS7846_FILTER_REPEAT; | |
632 | } else { | |
633 | /* | |
634 | * Maximum number of debouncing reached and still | |
635 | * not enough number of consistent readings. Abort | |
636 | * the whole sample, repeat it in the next sampling | |
637 | * period. | |
638 | */ | |
639 | ts->read_cnt = 0; | |
640 | return ADS7846_FILTER_IGNORE; | |
641 | } | |
642 | } else { | |
643 | if (++ts->read_rep > ts->debounce_rep) { | |
644 | /* | |
645 | * Got a good reading for this coordinate, | |
646 | * go for the next one. | |
647 | */ | |
648 | ts->read_cnt = 0; | |
649 | ts->read_rep = 0; | |
650 | return ADS7846_FILTER_OK; | |
651 | } else { | |
652 | /* Read more values that are consistent. */ | |
653 | ts->read_cnt++; | |
654 | return ADS7846_FILTER_REPEAT; | |
655 | } | |
656 | } | |
657 | } | |
658 | ||
659 | static int ads7846_no_filter(void *ads, int data_idx, int *val) | |
660 | { | |
661 | return ADS7846_FILTER_OK; | |
662 | } | |
663 | ||
664 | static int ads7846_get_value(struct ads7846 *ts, struct spi_message *m) | |
665 | { | |
879f2fea | 666 | int value; |
2991a1ca JW |
667 | struct spi_transfer *t = |
668 | list_entry(m->transfers.prev, struct spi_transfer, transfer_list); | |
669 | ||
670 | if (ts->model == 7845) { | |
879f2fea | 671 | value = be16_to_cpup((__be16 *)&(((char *)t->rx_buf)[1])); |
2991a1ca JW |
672 | } else { |
673 | /* | |
674 | * adjust: on-wire is a must-ignore bit, a BE12 value, then | |
675 | * padding; built from two 8 bit values written msb-first. | |
676 | */ | |
879f2fea | 677 | value = be16_to_cpup((__be16 *)t->rx_buf); |
2991a1ca | 678 | } |
879f2fea AG |
679 | |
680 | /* enforce ADC output is 12 bits width */ | |
681 | return (value >> 3) & 0xfff; | |
2991a1ca JW |
682 | } |
683 | ||
684 | static void ads7846_update_value(struct spi_message *m, int val) | |
685 | { | |
686 | struct spi_transfer *t = | |
687 | list_entry(m->transfers.prev, struct spi_transfer, transfer_list); | |
688 | ||
689 | *(u16 *)t->rx_buf = val; | |
690 | } | |
691 | ||
692 | static void ads7846_read_state(struct ads7846 *ts) | |
693 | { | |
694 | struct ads7846_packet *packet = ts->packet; | |
695 | struct spi_message *m; | |
696 | int msg_idx = 0; | |
697 | int val; | |
698 | int action; | |
699 | int error; | |
700 | ||
701 | while (msg_idx < ts->msg_count) { | |
702 | ||
703 | ts->wait_for_sync(); | |
704 | ||
705 | m = &ts->msg[msg_idx]; | |
706 | error = spi_sync(ts->spi, m); | |
707 | if (error) { | |
c8986208 | 708 | dev_err(&ts->spi->dev, "spi_sync --> %d\n", error); |
2991a1ca JW |
709 | packet->tc.ignore = true; |
710 | return; | |
711 | } | |
712 | ||
713 | /* | |
714 | * Last message is power down request, no need to convert | |
715 | * or filter the value. | |
716 | */ | |
717 | if (msg_idx < ts->msg_count - 1) { | |
ffa458c1 | 718 | |
2991a1ca JW |
719 | val = ads7846_get_value(ts, m); |
720 | ||
721 | action = ts->filter(ts->filter_data, msg_idx, &val); | |
722 | switch (action) { | |
723 | case ADS7846_FILTER_REPEAT: | |
724 | continue; | |
725 | ||
726 | case ADS7846_FILTER_IGNORE: | |
727 | packet->tc.ignore = true; | |
728 | msg_idx = ts->msg_count - 1; | |
729 | continue; | |
730 | ||
731 | case ADS7846_FILTER_OK: | |
732 | ads7846_update_value(m, val); | |
733 | packet->tc.ignore = false; | |
734 | msg_idx++; | |
735 | break; | |
736 | ||
737 | default: | |
738 | BUG(); | |
739 | } | |
740 | } else { | |
741 | msg_idx++; | |
742 | } | |
743 | } | |
744 | } | |
745 | ||
746 | static void ads7846_report_state(struct ads7846 *ts) | |
ffa458c1 | 747 | { |
2991a1ca JW |
748 | struct ads7846_packet *packet = ts->packet; |
749 | unsigned int Rt; | |
750 | u16 x, y, z1, z2; | |
ffa458c1 | 751 | |
2991a1ca JW |
752 | /* |
753 | * ads7846_get_value() does in-place conversion (including byte swap) | |
754 | * from on-the-wire format as part of debouncing to get stable | |
755 | * readings. | |
ffa458c1 | 756 | */ |
3eac5c7e AG |
757 | if (ts->model == 7845) { |
758 | x = *(u16 *)packet->tc.x_buf; | |
759 | y = *(u16 *)packet->tc.y_buf; | |
760 | z1 = 0; | |
761 | z2 = 0; | |
762 | } else { | |
763 | x = packet->tc.x; | |
764 | y = packet->tc.y; | |
765 | z1 = packet->tc.z1; | |
766 | z2 = packet->tc.z2; | |
767 | } | |
ffa458c1 DB |
768 | |
769 | /* range filtering */ | |
770 | if (x == MAX_12BIT) | |
771 | x = 0; | |
772 | ||
9460b652 HCE |
773 | if (ts->model == 7843) { |
774 | Rt = ts->pressure_max / 2; | |
3eac5c7e AG |
775 | } else if (ts->model == 7845) { |
776 | if (get_pendown_state(ts)) | |
777 | Rt = ts->pressure_max / 2; | |
778 | else | |
779 | Rt = 0; | |
780 | dev_vdbg(&ts->spi->dev, "x/y: %d/%d, PD %d\n", x, y, Rt); | |
9460b652 | 781 | } else if (likely(x && z1)) { |
ffa458c1 DB |
782 | /* compute touch pressure resistance using equation #2 */ |
783 | Rt = z2; | |
784 | Rt -= z1; | |
785 | Rt *= x; | |
786 | Rt *= ts->x_plate_ohms; | |
787 | Rt /= z1; | |
788 | Rt = (Rt + 2047) >> 12; | |
9460b652 | 789 | } else { |
ffa458c1 | 790 | Rt = 0; |
9460b652 | 791 | } |
969111e9 | 792 | |
2991a1ca JW |
793 | /* |
794 | * Sample found inconsistent by debouncing or pressure is beyond | |
1936d590 ID |
795 | * the maximum. Don't report it to user space, repeat at least |
796 | * once more the measurement | |
797 | */ | |
e8f462d2 | 798 | if (packet->tc.ignore || Rt > ts->pressure_max) { |
52ce4eaa PM |
799 | dev_vdbg(&ts->spi->dev, "ignored %d pressure %d\n", |
800 | packet->tc.ignore, Rt); | |
d5b415c9 ID |
801 | return; |
802 | } | |
803 | ||
2991a1ca JW |
804 | /* |
805 | * Maybe check the pendown state before reporting. This discards | |
1d25891f SH |
806 | * false readings when the pen is lifted. |
807 | */ | |
808 | if (ts->penirq_recheck_delay_usecs) { | |
809 | udelay(ts->penirq_recheck_delay_usecs); | |
4d5975e5 | 810 | if (!get_pendown_state(ts)) |
1d25891f SH |
811 | Rt = 0; |
812 | } | |
813 | ||
2991a1ca JW |
814 | /* |
815 | * NOTE: We can't rely on the pressure to determine the pen down | |
816 | * state, even this controller has a pressure sensor. The pressure | |
15e3589e ID |
817 | * value can fluctuate for quite a while after lifting the pen and |
818 | * in some cases may not even settle at the expected value. | |
ffa458c1 | 819 | * |
15e3589e ID |
820 | * The only safe way to check for the pen up condition is in the |
821 | * timer by reading the pen signal state (it's a GPIO _and_ IRQ). | |
ffa458c1 | 822 | */ |
ffa458c1 | 823 | if (Rt) { |
15e3589e | 824 | struct input_dev *input = ts->input; |
ae82d5ab | 825 | |
2991a1ca JW |
826 | if (ts->swap_xy) |
827 | swap(x, y); | |
828 | ||
15e3589e ID |
829 | if (!ts->pendown) { |
830 | input_report_key(input, BTN_TOUCH, 1); | |
2991a1ca | 831 | ts->pendown = true; |
52ce4eaa | 832 | dev_vdbg(&ts->spi->dev, "DOWN\n"); |
15e3589e | 833 | } |
86579a4c | 834 | |
15e3589e ID |
835 | input_report_abs(input, ABS_X, x); |
836 | input_report_abs(input, ABS_Y, y); | |
30ad7ba0 | 837 | input_report_abs(input, ABS_PRESSURE, ts->pressure_max - Rt); |
ffa458c1 | 838 | |
15e3589e | 839 | input_sync(input); |
52ce4eaa | 840 | dev_vdbg(&ts->spi->dev, "%4d/%4d/%4d\n", x, y, Rt); |
15e3589e | 841 | } |
da970e69 ID |
842 | } |
843 | ||
2991a1ca | 844 | static irqreturn_t ads7846_hard_irq(int irq, void *handle) |
da970e69 | 845 | { |
2991a1ca | 846 | struct ads7846 *ts = handle; |
da970e69 | 847 | |
2991a1ca | 848 | return get_pendown_state(ts) ? IRQ_WAKE_THREAD : IRQ_HANDLED; |
0b7018aa ID |
849 | } |
850 | ||
0b7018aa | 851 | |
7d12e780 | 852 | static irqreturn_t ads7846_irq(int irq, void *handle) |
0b7018aa ID |
853 | { |
854 | struct ads7846 *ts = handle; | |
7de90a8c | 855 | |
2991a1ca JW |
856 | /* Start with a small delay before checking pendown state */ |
857 | msleep(TS_POLL_DELAY); | |
ffa458c1 | 858 | |
2991a1ca | 859 | while (!ts->stopped && get_pendown_state(ts)) { |
ffa458c1 | 860 | |
2991a1ca JW |
861 | /* pen is down, continue with the measurement */ |
862 | ads7846_read_state(ts); | |
ffa458c1 | 863 | |
2991a1ca JW |
864 | if (!ts->stopped) |
865 | ads7846_report_state(ts); | |
c9e617a5 | 866 | |
2991a1ca JW |
867 | wait_event_timeout(ts->wait, ts->stopped, |
868 | msecs_to_jiffies(TS_POLL_PERIOD)); | |
ffa458c1 DB |
869 | } |
870 | ||
f5a28a7d | 871 | if (ts->pendown && !ts->stopped) { |
2991a1ca | 872 | struct input_dev *input = ts->input; |
7de90a8c | 873 | |
2991a1ca JW |
874 | input_report_key(input, BTN_TOUCH, 0); |
875 | input_report_abs(input, ABS_PRESSURE, 0); | |
876 | input_sync(input); | |
7de90a8c | 877 | |
2991a1ca JW |
878 | ts->pendown = false; |
879 | dev_vdbg(&ts->spi->dev, "UP\n"); | |
880 | } | |
91143379 | 881 | |
2991a1ca | 882 | return IRQ_HANDLED; |
7de90a8c ID |
883 | } |
884 | ||
02b6a58b | 885 | static int __maybe_unused ads7846_suspend(struct device *dev) |
7de90a8c | 886 | { |
3c36e719 | 887 | struct ads7846 *ts = dev_get_drvdata(dev); |
7de90a8c | 888 | |
2991a1ca | 889 | mutex_lock(&ts->lock); |
7de90a8c | 890 | |
2991a1ca | 891 | if (!ts->suspended) { |
7de90a8c | 892 | |
2991a1ca JW |
893 | if (!ts->disabled) |
894 | __ads7846_disable(ts); | |
7de90a8c | 895 | |
2991a1ca JW |
896 | if (device_may_wakeup(&ts->spi->dev)) |
897 | enable_irq_wake(ts->spi->irq); | |
fdba2bb1 | 898 | |
2991a1ca JW |
899 | ts->suspended = true; |
900 | } | |
901 | ||
902 | mutex_unlock(&ts->lock); | |
7de90a8c | 903 | |
2991a1ca | 904 | return 0; |
ffa458c1 DB |
905 | } |
906 | ||
02b6a58b | 907 | static int __maybe_unused ads7846_resume(struct device *dev) |
ffa458c1 | 908 | { |
3c36e719 | 909 | struct ads7846 *ts = dev_get_drvdata(dev); |
ffa458c1 | 910 | |
2991a1ca JW |
911 | mutex_lock(&ts->lock); |
912 | ||
913 | if (ts->suspended) { | |
fdba2bb1 | 914 | |
2991a1ca | 915 | ts->suspended = false; |
7de90a8c | 916 | |
2991a1ca JW |
917 | if (device_may_wakeup(&ts->spi->dev)) |
918 | disable_irq_wake(ts->spi->irq); | |
7de90a8c | 919 | |
2991a1ca JW |
920 | if (!ts->disabled) |
921 | __ads7846_enable(ts); | |
922 | } | |
923 | ||
924 | mutex_unlock(&ts->lock); | |
7de90a8c | 925 | |
ffa458c1 DB |
926 | return 0; |
927 | } | |
3c36e719 MB |
928 | |
929 | static SIMPLE_DEV_PM_OPS(ads7846_pm, ads7846_suspend, ads7846_resume); | |
ffa458c1 | 930 | |
5298cc4c | 931 | static int ads7846_setup_pendown(struct spi_device *spi, |
57691a1e DT |
932 | struct ads7846 *ts, |
933 | const struct ads7846_platform_data *pdata) | |
4d5975e5 | 934 | { |
4d5975e5 EM |
935 | int err; |
936 | ||
0fbc9fdb DT |
937 | /* |
938 | * REVISIT when the irq can be triggered active-low, or if for some | |
4d5975e5 EM |
939 | * reason the touchscreen isn't hooked up, we don't need to access |
940 | * the pendown state. | |
941 | */ | |
4d5975e5 EM |
942 | |
943 | if (pdata->get_pendown_state) { | |
944 | ts->get_pendown_state = pdata->get_pendown_state; | |
0fbc9fdb | 945 | } else if (gpio_is_valid(pdata->gpio_pendown)) { |
4d5975e5 | 946 | |
58c24400 IG |
947 | err = gpio_request_one(pdata->gpio_pendown, GPIOF_IN, |
948 | "ads7846_pendown"); | |
0fbc9fdb | 949 | if (err) { |
58c24400 IG |
950 | dev_err(&spi->dev, |
951 | "failed to request/setup pendown GPIO%d: %d\n", | |
952 | pdata->gpio_pendown, err); | |
1201e7e6 IG |
953 | return err; |
954 | } | |
4d5975e5 | 955 | |
0fbc9fdb DT |
956 | ts->gpio_pendown = pdata->gpio_pendown; |
957 | ||
c4f49254 IG |
958 | if (pdata->gpio_pendown_debounce) |
959 | gpio_set_debounce(pdata->gpio_pendown, | |
960 | pdata->gpio_pendown_debounce); | |
0fbc9fdb DT |
961 | } else { |
962 | dev_err(&spi->dev, "no get_pendown_state nor gpio_pendown?\n"); | |
963 | return -EINVAL; | |
964 | } | |
2991a1ca | 965 | |
4d5975e5 EM |
966 | return 0; |
967 | } | |
968 | ||
2991a1ca JW |
969 | /* |
970 | * Set up the transfers to read touchscreen state; this assumes we | |
971 | * use formula #2 for pressure, not #3. | |
972 | */ | |
5298cc4c | 973 | static void ads7846_setup_spi_msg(struct ads7846 *ts, |
57691a1e | 974 | const struct ads7846_platform_data *pdata) |
ffa458c1 | 975 | { |
2991a1ca JW |
976 | struct spi_message *m = &ts->msg[0]; |
977 | struct spi_transfer *x = ts->xfer; | |
978 | struct ads7846_packet *packet = ts->packet; | |
979 | int vref = pdata->keep_vref_on; | |
de2defd9 | 980 | |
06a09124 | 981 | if (ts->model == 7873) { |
2991a1ca JW |
982 | /* |
983 | * The AD7873 is almost identical to the ADS7846 | |
06a09124 | 984 | * keep VREF off during differential/ratiometric |
2991a1ca | 985 | * conversion modes. |
06a09124 MH |
986 | */ |
987 | ts->model = 7846; | |
988 | vref = 0; | |
989 | } | |
990 | ||
2991a1ca | 991 | ts->msg_count = 1; |
0b7018aa | 992 | spi_message_init(m); |
2991a1ca | 993 | m->context = ts; |
0b7018aa | 994 | |
3eac5c7e AG |
995 | if (ts->model == 7845) { |
996 | packet->read_y_cmd[0] = READ_Y(vref); | |
997 | packet->read_y_cmd[1] = 0; | |
998 | packet->read_y_cmd[2] = 0; | |
999 | x->tx_buf = &packet->read_y_cmd[0]; | |
1000 | x->rx_buf = &packet->tc.y_buf[0]; | |
1001 | x->len = 3; | |
1002 | spi_message_add_tail(x, m); | |
1003 | } else { | |
1004 | /* y- still on; turn on only y+ (and ADC) */ | |
1005 | packet->read_y = READ_Y(vref); | |
1006 | x->tx_buf = &packet->read_y; | |
1007 | x->len = 1; | |
1008 | spi_message_add_tail(x, m); | |
d93f70b2 | 1009 | |
3eac5c7e AG |
1010 | x++; |
1011 | x->rx_buf = &packet->tc.y; | |
1012 | x->len = 2; | |
1013 | spi_message_add_tail(x, m); | |
1014 | } | |
0b7018aa | 1015 | |
2991a1ca JW |
1016 | /* |
1017 | * The first sample after switching drivers can be low quality; | |
e4f48861 SH |
1018 | * optionally discard it, using a second one after the signals |
1019 | * have had enough time to stabilize. | |
1020 | */ | |
1021 | if (pdata->settle_delay_usecs) { | |
1022 | x->delay_usecs = pdata->settle_delay_usecs; | |
1023 | ||
1024 | x++; | |
e8f462d2 | 1025 | x->tx_buf = &packet->read_y; |
e4f48861 SH |
1026 | x->len = 1; |
1027 | spi_message_add_tail(x, m); | |
1028 | ||
1029 | x++; | |
e8f462d2 | 1030 | x->rx_buf = &packet->tc.y; |
e4f48861 SH |
1031 | x->len = 2; |
1032 | spi_message_add_tail(x, m); | |
1033 | } | |
1034 | ||
2991a1ca | 1035 | ts->msg_count++; |
0b7018aa ID |
1036 | m++; |
1037 | spi_message_init(m); | |
2991a1ca | 1038 | m->context = ts; |
0b7018aa | 1039 | |
3eac5c7e AG |
1040 | if (ts->model == 7845) { |
1041 | x++; | |
1042 | packet->read_x_cmd[0] = READ_X(vref); | |
1043 | packet->read_x_cmd[1] = 0; | |
1044 | packet->read_x_cmd[2] = 0; | |
1045 | x->tx_buf = &packet->read_x_cmd[0]; | |
1046 | x->rx_buf = &packet->tc.x_buf[0]; | |
1047 | x->len = 3; | |
1048 | spi_message_add_tail(x, m); | |
1049 | } else { | |
1050 | /* turn y- off, x+ on, then leave in lowpower */ | |
1051 | x++; | |
1052 | packet->read_x = READ_X(vref); | |
1053 | x->tx_buf = &packet->read_x; | |
1054 | x->len = 1; | |
1055 | spi_message_add_tail(x, m); | |
0b7018aa | 1056 | |
3eac5c7e AG |
1057 | x++; |
1058 | x->rx_buf = &packet->tc.x; | |
1059 | x->len = 2; | |
1060 | spi_message_add_tail(x, m); | |
1061 | } | |
0b7018aa | 1062 | |
e4f48861 SH |
1063 | /* ... maybe discard first sample ... */ |
1064 | if (pdata->settle_delay_usecs) { | |
1065 | x->delay_usecs = pdata->settle_delay_usecs; | |
1066 | ||
1067 | x++; | |
e8f462d2 | 1068 | x->tx_buf = &packet->read_x; |
e4f48861 SH |
1069 | x->len = 1; |
1070 | spi_message_add_tail(x, m); | |
1071 | ||
1072 | x++; | |
e8f462d2 | 1073 | x->rx_buf = &packet->tc.x; |
e4f48861 SH |
1074 | x->len = 2; |
1075 | spi_message_add_tail(x, m); | |
1076 | } | |
1077 | ||
ffa458c1 DB |
1078 | /* turn y+ off, x- on; we'll use formula #2 */ |
1079 | if (ts->model == 7846) { | |
2991a1ca | 1080 | ts->msg_count++; |
0b7018aa ID |
1081 | m++; |
1082 | spi_message_init(m); | |
2991a1ca | 1083 | m->context = ts; |
0b7018aa | 1084 | |
d93f70b2 | 1085 | x++; |
e8f462d2 DT |
1086 | packet->read_z1 = READ_Z1(vref); |
1087 | x->tx_buf = &packet->read_z1; | |
ffa458c1 | 1088 | x->len = 1; |
0b7018aa | 1089 | spi_message_add_tail(x, m); |
d93f70b2 | 1090 | |
ffa458c1 | 1091 | x++; |
e8f462d2 | 1092 | x->rx_buf = &packet->tc.z1; |
ffa458c1 | 1093 | x->len = 2; |
0b7018aa ID |
1094 | spi_message_add_tail(x, m); |
1095 | ||
e4f48861 SH |
1096 | /* ... maybe discard first sample ... */ |
1097 | if (pdata->settle_delay_usecs) { | |
1098 | x->delay_usecs = pdata->settle_delay_usecs; | |
1099 | ||
1100 | x++; | |
e8f462d2 | 1101 | x->tx_buf = &packet->read_z1; |
e4f48861 SH |
1102 | x->len = 1; |
1103 | spi_message_add_tail(x, m); | |
1104 | ||
1105 | x++; | |
e8f462d2 | 1106 | x->rx_buf = &packet->tc.z1; |
e4f48861 SH |
1107 | x->len = 2; |
1108 | spi_message_add_tail(x, m); | |
1109 | } | |
1110 | ||
2991a1ca | 1111 | ts->msg_count++; |
0b7018aa ID |
1112 | m++; |
1113 | spi_message_init(m); | |
2991a1ca | 1114 | m->context = ts; |
ffa458c1 | 1115 | |
d93f70b2 | 1116 | x++; |
e8f462d2 DT |
1117 | packet->read_z2 = READ_Z2(vref); |
1118 | x->tx_buf = &packet->read_z2; | |
ffa458c1 | 1119 | x->len = 1; |
0b7018aa | 1120 | spi_message_add_tail(x, m); |
d93f70b2 | 1121 | |
ffa458c1 | 1122 | x++; |
e8f462d2 | 1123 | x->rx_buf = &packet->tc.z2; |
ffa458c1 | 1124 | x->len = 2; |
0b7018aa | 1125 | spi_message_add_tail(x, m); |
ffa458c1 | 1126 | |
e4f48861 SH |
1127 | /* ... maybe discard first sample ... */ |
1128 | if (pdata->settle_delay_usecs) { | |
1129 | x->delay_usecs = pdata->settle_delay_usecs; | |
1130 | ||
1131 | x++; | |
e8f462d2 | 1132 | x->tx_buf = &packet->read_z2; |
e4f48861 SH |
1133 | x->len = 1; |
1134 | spi_message_add_tail(x, m); | |
1135 | ||
1136 | x++; | |
e8f462d2 | 1137 | x->rx_buf = &packet->tc.z2; |
e4f48861 SH |
1138 | x->len = 2; |
1139 | spi_message_add_tail(x, m); | |
1140 | } | |
0b7018aa | 1141 | } |
53a0ef89 ID |
1142 | |
1143 | /* power down */ | |
2991a1ca | 1144 | ts->msg_count++; |
0b7018aa ID |
1145 | m++; |
1146 | spi_message_init(m); | |
2991a1ca | 1147 | m->context = ts; |
0b7018aa | 1148 | |
3eac5c7e AG |
1149 | if (ts->model == 7845) { |
1150 | x++; | |
1151 | packet->pwrdown_cmd[0] = PWRDOWN; | |
1152 | packet->pwrdown_cmd[1] = 0; | |
1153 | packet->pwrdown_cmd[2] = 0; | |
1154 | x->tx_buf = &packet->pwrdown_cmd[0]; | |
1155 | x->len = 3; | |
1156 | } else { | |
1157 | x++; | |
1158 | packet->pwrdown = PWRDOWN; | |
1159 | x->tx_buf = &packet->pwrdown; | |
1160 | x->len = 1; | |
1161 | spi_message_add_tail(x, m); | |
1162 | ||
1163 | x++; | |
1164 | x->rx_buf = &packet->dummy; | |
1165 | x->len = 2; | |
1166 | } | |
53a0ef89 | 1167 | |
d93f70b2 | 1168 | CS_CHANGE(*x); |
0b7018aa | 1169 | spi_message_add_tail(x, m); |
2991a1ca | 1170 | } |
ffa458c1 | 1171 | |
a608026e DM |
1172 | #ifdef CONFIG_OF |
1173 | static const struct of_device_id ads7846_dt_ids[] = { | |
1174 | { .compatible = "ti,tsc2046", .data = (void *) 7846 }, | |
1175 | { .compatible = "ti,ads7843", .data = (void *) 7843 }, | |
1176 | { .compatible = "ti,ads7845", .data = (void *) 7845 }, | |
1177 | { .compatible = "ti,ads7846", .data = (void *) 7846 }, | |
1178 | { .compatible = "ti,ads7873", .data = (void *) 7873 }, | |
1179 | { } | |
1180 | }; | |
1181 | MODULE_DEVICE_TABLE(of, ads7846_dt_ids); | |
1182 | ||
1183 | static const struct ads7846_platform_data *ads7846_probe_dt(struct device *dev) | |
1184 | { | |
1185 | struct ads7846_platform_data *pdata; | |
1186 | struct device_node *node = dev->of_node; | |
1187 | const struct of_device_id *match; | |
1188 | ||
1189 | if (!node) { | |
1190 | dev_err(dev, "Device does not have associated DT data\n"); | |
1191 | return ERR_PTR(-EINVAL); | |
1192 | } | |
1193 | ||
1194 | match = of_match_device(ads7846_dt_ids, dev); | |
1195 | if (!match) { | |
1196 | dev_err(dev, "Unknown device model\n"); | |
1197 | return ERR_PTR(-EINVAL); | |
1198 | } | |
1199 | ||
1200 | pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); | |
1201 | if (!pdata) | |
1202 | return ERR_PTR(-ENOMEM); | |
1203 | ||
1204 | pdata->model = (unsigned long)match->data; | |
1205 | ||
1206 | of_property_read_u16(node, "ti,vref-delay-usecs", | |
1207 | &pdata->vref_delay_usecs); | |
1208 | of_property_read_u16(node, "ti,vref-mv", &pdata->vref_mv); | |
1209 | pdata->keep_vref_on = of_property_read_bool(node, "ti,keep-vref-on"); | |
1210 | ||
1211 | pdata->swap_xy = of_property_read_bool(node, "ti,swap-xy"); | |
1212 | ||
1213 | of_property_read_u16(node, "ti,settle-delay-usec", | |
1214 | &pdata->settle_delay_usecs); | |
1215 | of_property_read_u16(node, "ti,penirq-recheck-delay-usecs", | |
1216 | &pdata->penirq_recheck_delay_usecs); | |
1217 | ||
1218 | of_property_read_u16(node, "ti,x-plate-ohms", &pdata->x_plate_ohms); | |
1219 | of_property_read_u16(node, "ti,y-plate-ohms", &pdata->y_plate_ohms); | |
1220 | ||
1221 | of_property_read_u16(node, "ti,x-min", &pdata->x_min); | |
1222 | of_property_read_u16(node, "ti,y-min", &pdata->y_min); | |
1223 | of_property_read_u16(node, "ti,x-max", &pdata->x_max); | |
1224 | of_property_read_u16(node, "ti,y-max", &pdata->y_max); | |
1225 | ||
1226 | of_property_read_u16(node, "ti,pressure-min", &pdata->pressure_min); | |
1227 | of_property_read_u16(node, "ti,pressure-max", &pdata->pressure_max); | |
1228 | ||
1229 | of_property_read_u16(node, "ti,debounce-max", &pdata->debounce_max); | |
1230 | of_property_read_u16(node, "ti,debounce-tol", &pdata->debounce_tol); | |
1231 | of_property_read_u16(node, "ti,debounce-rep", &pdata->debounce_rep); | |
1232 | ||
1233 | of_property_read_u32(node, "ti,pendown-gpio-debounce", | |
1234 | &pdata->gpio_pendown_debounce); | |
1235 | ||
abf77a32 DT |
1236 | pdata->wakeup = of_property_read_bool(node, "wakeup-source") || |
1237 | of_property_read_bool(node, "linux,wakeup"); | |
a608026e DM |
1238 | |
1239 | pdata->gpio_pendown = of_get_named_gpio(dev->of_node, "pendown-gpio", 0); | |
1240 | ||
1241 | return pdata; | |
1242 | } | |
1243 | #else | |
1244 | static const struct ads7846_platform_data *ads7846_probe_dt(struct device *dev) | |
1245 | { | |
1246 | dev_err(dev, "no platform data defined\n"); | |
1247 | return ERR_PTR(-EINVAL); | |
1248 | } | |
1249 | #endif | |
1250 | ||
5298cc4c | 1251 | static int ads7846_probe(struct spi_device *spi) |
2991a1ca | 1252 | { |
a608026e | 1253 | const struct ads7846_platform_data *pdata; |
2991a1ca JW |
1254 | struct ads7846 *ts; |
1255 | struct ads7846_packet *packet; | |
1256 | struct input_dev *input_dev; | |
2991a1ca JW |
1257 | unsigned long irq_flags; |
1258 | int err; | |
1259 | ||
1260 | if (!spi->irq) { | |
1261 | dev_dbg(&spi->dev, "no IRQ?\n"); | |
a608026e | 1262 | return -EINVAL; |
2991a1ca JW |
1263 | } |
1264 | ||
1265 | /* don't exceed max specified sample rate */ | |
1266 | if (spi->max_speed_hz > (125000 * SAMPLE_BITS)) { | |
a608026e | 1267 | dev_err(&spi->dev, "f(sample) %d KHz?\n", |
2991a1ca JW |
1268 | (spi->max_speed_hz/SAMPLE_BITS)/1000); |
1269 | return -EINVAL; | |
1270 | } | |
1271 | ||
a608026e DM |
1272 | /* |
1273 | * We'd set TX word size 8 bits and RX word size to 13 bits ... except | |
2991a1ca JW |
1274 | * that even if the hardware can do that, the SPI controller driver |
1275 | * may not. So we stick to very-portable 8 bit words, both RX and TX. | |
1276 | */ | |
1277 | spi->bits_per_word = 8; | |
1278 | spi->mode = SPI_MODE_0; | |
1279 | err = spi_setup(spi); | |
1280 | if (err < 0) | |
1281 | return err; | |
ffa458c1 | 1282 | |
2991a1ca JW |
1283 | ts = kzalloc(sizeof(struct ads7846), GFP_KERNEL); |
1284 | packet = kzalloc(sizeof(struct ads7846_packet), GFP_KERNEL); | |
1285 | input_dev = input_allocate_device(); | |
1286 | if (!ts || !packet || !input_dev) { | |
1287 | err = -ENOMEM; | |
1288 | goto err_free_mem; | |
1289 | } | |
1290 | ||
c12454fa | 1291 | spi_set_drvdata(spi, ts); |
2991a1ca JW |
1292 | |
1293 | ts->packet = packet; | |
1294 | ts->spi = spi; | |
1295 | ts->input = input_dev; | |
2991a1ca JW |
1296 | |
1297 | mutex_init(&ts->lock); | |
1298 | init_waitqueue_head(&ts->wait); | |
1299 | ||
a608026e DM |
1300 | pdata = dev_get_platdata(&spi->dev); |
1301 | if (!pdata) { | |
1302 | pdata = ads7846_probe_dt(&spi->dev); | |
a1cd3fd0 PG |
1303 | if (IS_ERR(pdata)) { |
1304 | err = PTR_ERR(pdata); | |
1305 | goto err_free_mem; | |
1306 | } | |
a608026e DM |
1307 | } |
1308 | ||
2991a1ca JW |
1309 | ts->model = pdata->model ? : 7846; |
1310 | ts->vref_delay_usecs = pdata->vref_delay_usecs ? : 100; | |
1311 | ts->x_plate_ohms = pdata->x_plate_ohms ? : 400; | |
1312 | ts->pressure_max = pdata->pressure_max ? : ~0; | |
1313 | ||
a608026e DM |
1314 | ts->vref_mv = pdata->vref_mv; |
1315 | ts->swap_xy = pdata->swap_xy; | |
1316 | ||
2991a1ca JW |
1317 | if (pdata->filter != NULL) { |
1318 | if (pdata->filter_init != NULL) { | |
1319 | err = pdata->filter_init(pdata, &ts->filter_data); | |
1320 | if (err < 0) | |
1321 | goto err_free_mem; | |
1322 | } | |
1323 | ts->filter = pdata->filter; | |
1324 | ts->filter_cleanup = pdata->filter_cleanup; | |
1325 | } else if (pdata->debounce_max) { | |
1326 | ts->debounce_max = pdata->debounce_max; | |
1327 | if (ts->debounce_max < 2) | |
1328 | ts->debounce_max = 2; | |
1329 | ts->debounce_tol = pdata->debounce_tol; | |
1330 | ts->debounce_rep = pdata->debounce_rep; | |
1331 | ts->filter = ads7846_debounce_filter; | |
1332 | ts->filter_data = ts; | |
1333 | } else { | |
1334 | ts->filter = ads7846_no_filter; | |
1335 | } | |
1336 | ||
57691a1e | 1337 | err = ads7846_setup_pendown(spi, ts, pdata); |
2991a1ca JW |
1338 | if (err) |
1339 | goto err_cleanup_filter; | |
1340 | ||
1341 | if (pdata->penirq_recheck_delay_usecs) | |
1342 | ts->penirq_recheck_delay_usecs = | |
1343 | pdata->penirq_recheck_delay_usecs; | |
1344 | ||
1345 | ts->wait_for_sync = pdata->wait_for_sync ? : null_wait_for_sync; | |
1346 | ||
1347 | snprintf(ts->phys, sizeof(ts->phys), "%s/input0", dev_name(&spi->dev)); | |
1348 | snprintf(ts->name, sizeof(ts->name), "ADS%d Touchscreen", ts->model); | |
1349 | ||
1350 | input_dev->name = ts->name; | |
1351 | input_dev->phys = ts->phys; | |
1352 | input_dev->dev.parent = &spi->dev; | |
1353 | ||
1354 | input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS); | |
1355 | input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH); | |
1356 | input_set_abs_params(input_dev, ABS_X, | |
1357 | pdata->x_min ? : 0, | |
1358 | pdata->x_max ? : MAX_12BIT, | |
1359 | 0, 0); | |
1360 | input_set_abs_params(input_dev, ABS_Y, | |
1361 | pdata->y_min ? : 0, | |
1362 | pdata->y_max ? : MAX_12BIT, | |
1363 | 0, 0); | |
1364 | input_set_abs_params(input_dev, ABS_PRESSURE, | |
1365 | pdata->pressure_min, pdata->pressure_max, 0, 0); | |
1366 | ||
1367 | ads7846_setup_spi_msg(ts, pdata); | |
d5b415c9 | 1368 | |
91143379 GI |
1369 | ts->reg = regulator_get(&spi->dev, "vcc"); |
1370 | if (IS_ERR(ts->reg)) { | |
067fb2f6 | 1371 | err = PTR_ERR(ts->reg); |
56960b36 | 1372 | dev_err(&spi->dev, "unable to get regulator: %d\n", err); |
91143379 GI |
1373 | goto err_free_gpio; |
1374 | } | |
1375 | ||
1376 | err = regulator_enable(ts->reg); | |
1377 | if (err) { | |
1378 | dev_err(&spi->dev, "unable to enable regulator: %d\n", err); | |
1379 | goto err_put_regulator; | |
1380 | } | |
1381 | ||
0f622bf4 | 1382 | irq_flags = pdata->irq_flags ? : IRQF_TRIGGER_FALLING; |
2991a1ca | 1383 | irq_flags |= IRQF_ONESHOT; |
7804302b | 1384 | |
2991a1ca JW |
1385 | err = request_threaded_irq(spi->irq, ads7846_hard_irq, ads7846_irq, |
1386 | irq_flags, spi->dev.driver->name, ts); | |
0f622bf4 | 1387 | if (err && !pdata->irq_flags) { |
c57c0a2a MR |
1388 | dev_info(&spi->dev, |
1389 | "trying pin change workaround on irq %d\n", spi->irq); | |
2991a1ca JW |
1390 | irq_flags |= IRQF_TRIGGER_RISING; |
1391 | err = request_threaded_irq(spi->irq, | |
1392 | ads7846_hard_irq, ads7846_irq, | |
1393 | irq_flags, spi->dev.driver->name, ts); | |
0f622bf4 DT |
1394 | } |
1395 | ||
1396 | if (err) { | |
1397 | dev_dbg(&spi->dev, "irq %d busy?\n", spi->irq); | |
1398 | goto err_disable_regulator; | |
ffa458c1 | 1399 | } |
ffa458c1 | 1400 | |
2c8dc071 DB |
1401 | err = ads784x_hwmon_register(spi, ts); |
1402 | if (err) | |
1403 | goto err_free_irq; | |
1404 | ||
2e5a7bd9 | 1405 | dev_info(&spi->dev, "touchscreen, irq %d\n", spi->irq); |
ffa458c1 | 1406 | |
2991a1ca JW |
1407 | /* |
1408 | * Take a first sample, leaving nPENIRQ active and vREF off; avoid | |
ffa458c1 DB |
1409 | * the touchscreen, in case it's not connected. |
1410 | */ | |
3eac5c7e AG |
1411 | if (ts->model == 7845) |
1412 | ads7845_read12_ser(&spi->dev, PWRDOWN); | |
1413 | else | |
ebcaaad9 | 1414 | (void) ads7846_read12_ser(&spi->dev, READ_12BIT_SER(vaux)); |
ffa458c1 | 1415 | |
2c8dc071 | 1416 | err = sysfs_create_group(&spi->dev.kobj, &ads784x_attr_group); |
8dd51650 | 1417 | if (err) |
2c8dc071 | 1418 | goto err_remove_hwmon; |
7de90a8c | 1419 | |
a90f7e98 DT |
1420 | err = input_register_device(input_dev); |
1421 | if (err) | |
8dd51650 | 1422 | goto err_remove_attr_group; |
a90f7e98 | 1423 | |
fdba2bb1 RL |
1424 | device_init_wakeup(&spi->dev, pdata->wakeup); |
1425 | ||
a608026e DM |
1426 | /* |
1427 | * If device does not carry platform data we must have allocated it | |
1428 | * when parsing DT data. | |
1429 | */ | |
1430 | if (!dev_get_platdata(&spi->dev)) | |
1431 | devm_kfree(&spi->dev, (void *)pdata); | |
1432 | ||
ffa458c1 | 1433 | return 0; |
a90f7e98 | 1434 | |
8dd51650 | 1435 | err_remove_attr_group: |
2c8dc071 DB |
1436 | sysfs_remove_group(&spi->dev.kobj, &ads784x_attr_group); |
1437 | err_remove_hwmon: | |
1438 | ads784x_hwmon_unregister(spi, ts); | |
8dd51650 | 1439 | err_free_irq: |
a90f7e98 | 1440 | free_irq(spi->irq, ts); |
91143379 GI |
1441 | err_disable_regulator: |
1442 | regulator_disable(ts->reg); | |
1443 | err_put_regulator: | |
1444 | regulator_put(ts->reg); | |
4d5975e5 | 1445 | err_free_gpio: |
0fbc9fdb | 1446 | if (!ts->get_pendown_state) |
4d5975e5 | 1447 | gpio_free(ts->gpio_pendown); |
da970e69 ID |
1448 | err_cleanup_filter: |
1449 | if (ts->filter_cleanup) | |
1450 | ts->filter_cleanup(ts->filter_data); | |
a90f7e98 DT |
1451 | err_free_mem: |
1452 | input_free_device(input_dev); | |
e8f462d2 | 1453 | kfree(packet); |
a90f7e98 DT |
1454 | kfree(ts); |
1455 | return err; | |
ffa458c1 DB |
1456 | } |
1457 | ||
e2619cf7 | 1458 | static int ads7846_remove(struct spi_device *spi) |
ffa458c1 | 1459 | { |
c12454fa | 1460 | struct ads7846 *ts = spi_get_drvdata(spi); |
ffa458c1 | 1461 | |
2c8dc071 | 1462 | sysfs_remove_group(&spi->dev.kobj, &ads784x_attr_group); |
ffa458c1 | 1463 | |
2991a1ca | 1464 | ads7846_disable(ts); |
7de90a8c | 1465 | free_irq(ts->spi->irq, ts); |
2991a1ca JW |
1466 | |
1467 | input_unregister_device(ts->input); | |
1468 | ||
1469 | ads784x_hwmon_unregister(spi, ts); | |
7de90a8c | 1470 | |
91143379 GI |
1471 | regulator_put(ts->reg); |
1472 | ||
0fbc9fdb DT |
1473 | if (!ts->get_pendown_state) { |
1474 | /* | |
1475 | * If we are not using specialized pendown method we must | |
1476 | * have been relying on gpio we set up ourselves. | |
1477 | */ | |
4d5975e5 | 1478 | gpio_free(ts->gpio_pendown); |
0fbc9fdb | 1479 | } |
4d5975e5 | 1480 | |
da970e69 ID |
1481 | if (ts->filter_cleanup) |
1482 | ts->filter_cleanup(ts->filter_data); | |
1483 | ||
e8f462d2 | 1484 | kfree(ts->packet); |
ffa458c1 DB |
1485 | kfree(ts); |
1486 | ||
2e5a7bd9 | 1487 | dev_dbg(&spi->dev, "unregistered touchscreen\n"); |
2991a1ca | 1488 | |
ffa458c1 DB |
1489 | return 0; |
1490 | } | |
1491 | ||
2e5a7bd9 DB |
1492 | static struct spi_driver ads7846_driver = { |
1493 | .driver = { | |
1494 | .name = "ads7846", | |
3c36e719 | 1495 | .pm = &ads7846_pm, |
a608026e | 1496 | .of_match_table = of_match_ptr(ads7846_dt_ids), |
2e5a7bd9 | 1497 | }, |
ffa458c1 | 1498 | .probe = ads7846_probe, |
1cb0aa88 | 1499 | .remove = ads7846_remove, |
ffa458c1 DB |
1500 | }; |
1501 | ||
ca83922e | 1502 | module_spi_driver(ads7846_driver); |
ffa458c1 DB |
1503 | |
1504 | MODULE_DESCRIPTION("ADS7846 TouchScreen Driver"); | |
1505 | MODULE_LICENSE("GPL"); | |
e0626e38 | 1506 | MODULE_ALIAS("spi:ads7846"); |