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Commit | Line | Data |
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ffa458c1 DB |
1 | /* |
2 | * ADS7846 based touchscreen and sensor driver | |
3 | * | |
4 | * Copyright (c) 2005 David Brownell | |
7de90a8c ID |
5 | * Copyright (c) 2006 Nokia Corporation |
6 | * Various changes: Imre Deak <imre.deak@nokia.com> | |
ffa458c1 DB |
7 | * |
8 | * Using code from: | |
9 | * - corgi_ts.c | |
10 | * Copyright (C) 2004-2005 Richard Purdie | |
11 | * - omap_ts.[hc], ads7846.h, ts_osk.c | |
12 | * Copyright (C) 2002 MontaVista Software | |
13 | * Copyright (C) 2004 Texas Instruments | |
14 | * Copyright (C) 2005 Dirk Behme | |
15 | * | |
16 | * This program is free software; you can redistribute it and/or modify | |
17 | * it under the terms of the GNU General Public License version 2 as | |
18 | * published by the Free Software Foundation. | |
19 | */ | |
2c8dc071 | 20 | #include <linux/hwmon.h> |
ffa458c1 | 21 | #include <linux/init.h> |
2c8dc071 | 22 | #include <linux/err.h> |
ffa458c1 DB |
23 | #include <linux/delay.h> |
24 | #include <linux/input.h> | |
25 | #include <linux/interrupt.h> | |
26 | #include <linux/slab.h> | |
27 | #include <linux/spi/spi.h> | |
28 | #include <linux/spi/ads7846.h> | |
3ac8bf07 | 29 | #include <asm/irq.h> |
ffa458c1 DB |
30 | |
31 | #ifdef CONFIG_ARM | |
32 | #include <asm/mach-types.h> | |
33 | #ifdef CONFIG_ARCH_OMAP | |
34 | #include <asm/arch/gpio.h> | |
35 | #endif | |
ffa458c1 DB |
36 | #endif |
37 | ||
38 | ||
39 | /* | |
9084533e DB |
40 | * This code has been heavily tested on a Nokia 770, and lightly |
41 | * tested on other ads7846 devices (OSK/Mistral, Lubbock). | |
ffa458c1 DB |
42 | * Support for ads7843 and ads7845 has only been stubbed in. |
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 | * | |
ffa458c1 DB |
50 | * app note sbaa036 talks in more detail about accurate sampling... |
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 | ||
1936d590 ID |
58 | #define TS_POLL_DELAY (1 * 1000000) /* ns delay before the first sample */ |
59 | #define TS_POLL_PERIOD (5 * 1000000) /* ns 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 DB |
64 | struct ts_event { |
65 | /* For portability, we can't read 12 bit values using SPI (which | |
66 | * would make the controller deliver them as native byteorder u16 | |
d93f70b2 | 67 | * with msbs zeroed). Instead, we read them as two 8-bit values, |
da970e69 | 68 | * *** WHICH NEED BYTESWAPPING *** and range adjustment. |
ffa458c1 | 69 | */ |
da970e69 ID |
70 | u16 x; |
71 | u16 y; | |
72 | u16 z1, z2; | |
2c8dc071 | 73 | int ignore; |
ffa458c1 DB |
74 | }; |
75 | ||
76 | struct ads7846 { | |
a90f7e98 | 77 | struct input_dev *input; |
ffa458c1 DB |
78 | char phys[32]; |
79 | ||
80 | struct spi_device *spi; | |
2c8dc071 DB |
81 | |
82 | #if defined(CONFIG_HWMON) || defined(CONFIG_HWMON_MODULE) | |
8dd51650 | 83 | struct attribute_group *attr_group; |
2c8dc071 DB |
84 | struct class_device *hwmon; |
85 | #endif | |
86 | ||
ffa458c1 DB |
87 | u16 model; |
88 | u16 vref_delay_usecs; | |
89 | u16 x_plate_ohms; | |
d5b415c9 | 90 | u16 pressure_max; |
ffa458c1 | 91 | |
53a0ef89 ID |
92 | u8 read_x, read_y, read_z1, read_z2, pwrdown; |
93 | u16 dummy; /* for the pwrdown read */ | |
ffa458c1 DB |
94 | struct ts_event tc; |
95 | ||
53a0ef89 | 96 | struct spi_transfer xfer[10]; |
0b7018aa | 97 | struct spi_message msg[5]; |
d5b415c9 | 98 | struct spi_message *last_msg; |
0b7018aa ID |
99 | int msg_idx; |
100 | int read_cnt; | |
d5b415c9 | 101 | int read_rep; |
0b7018aa ID |
102 | int last_read; |
103 | ||
104 | u16 debounce_max; | |
105 | u16 debounce_tol; | |
d5b415c9 | 106 | u16 debounce_rep; |
ffa458c1 DB |
107 | |
108 | spinlock_t lock; | |
1936d590 | 109 | struct hrtimer timer; |
ffa458c1 DB |
110 | unsigned pendown:1; /* P: lock */ |
111 | unsigned pending:1; /* P: lock */ | |
112 | // FIXME remove "irq_disabled" | |
113 | unsigned irq_disabled:1; /* P: lock */ | |
7de90a8c | 114 | unsigned disabled:1; |
c9e617a5 | 115 | |
da970e69 ID |
116 | int (*filter)(void *data, int data_idx, int *val); |
117 | void *filter_data; | |
118 | void (*filter_cleanup)(void *data); | |
c9e617a5 | 119 | int (*get_pendown_state)(void); |
ffa458c1 DB |
120 | }; |
121 | ||
122 | /* leave chip selected when we're done, for quicker re-select? */ | |
123 | #if 0 | |
124 | #define CS_CHANGE(xfer) ((xfer).cs_change = 1) | |
125 | #else | |
126 | #define CS_CHANGE(xfer) ((xfer).cs_change = 0) | |
127 | #endif | |
128 | ||
129 | /*--------------------------------------------------------------------------*/ | |
130 | ||
131 | /* The ADS7846 has touchscreen and other sensors. | |
132 | * Earlier ads784x chips are somewhat compatible. | |
133 | */ | |
134 | #define ADS_START (1 << 7) | |
135 | #define ADS_A2A1A0_d_y (1 << 4) /* differential */ | |
136 | #define ADS_A2A1A0_d_z1 (3 << 4) /* differential */ | |
137 | #define ADS_A2A1A0_d_z2 (4 << 4) /* differential */ | |
138 | #define ADS_A2A1A0_d_x (5 << 4) /* differential */ | |
139 | #define ADS_A2A1A0_temp0 (0 << 4) /* non-differential */ | |
140 | #define ADS_A2A1A0_vbatt (2 << 4) /* non-differential */ | |
141 | #define ADS_A2A1A0_vaux (6 << 4) /* non-differential */ | |
142 | #define ADS_A2A1A0_temp1 (7 << 4) /* non-differential */ | |
143 | #define ADS_8_BIT (1 << 3) | |
144 | #define ADS_12_BIT (0 << 3) | |
145 | #define ADS_SER (1 << 2) /* non-differential */ | |
146 | #define ADS_DFR (0 << 2) /* differential */ | |
147 | #define ADS_PD10_PDOWN (0 << 0) /* lowpower mode + penirq */ | |
148 | #define ADS_PD10_ADC_ON (1 << 0) /* ADC on */ | |
149 | #define ADS_PD10_REF_ON (2 << 0) /* vREF on + penirq */ | |
150 | #define ADS_PD10_ALL_ON (3 << 0) /* ADC + vREF on */ | |
151 | ||
152 | #define MAX_12BIT ((1<<12)-1) | |
153 | ||
154 | /* leave ADC powered up (disables penirq) between differential samples */ | |
de2defd9 ID |
155 | #define READ_12BIT_DFR(x, adc, vref) (ADS_START | ADS_A2A1A0_d_ ## x \ |
156 | | ADS_12_BIT | ADS_DFR | \ | |
157 | (adc ? ADS_PD10_ADC_ON : 0) | (vref ? ADS_PD10_REF_ON : 0)) | |
ffa458c1 | 158 | |
de2defd9 ID |
159 | #define READ_Y(vref) (READ_12BIT_DFR(y, 1, vref)) |
160 | #define READ_Z1(vref) (READ_12BIT_DFR(z1, 1, vref)) | |
161 | #define READ_Z2(vref) (READ_12BIT_DFR(z2, 1, vref)) | |
53a0ef89 | 162 | |
de2defd9 ID |
163 | #define READ_X(vref) (READ_12BIT_DFR(x, 1, vref)) |
164 | #define PWRDOWN (READ_12BIT_DFR(y, 0, 0)) /* LAST */ | |
ffa458c1 DB |
165 | |
166 | /* single-ended samples need to first power up reference voltage; | |
167 | * we leave both ADC and VREF powered | |
168 | */ | |
169 | #define READ_12BIT_SER(x) (ADS_START | ADS_A2A1A0_ ## x \ | |
170 | | ADS_12_BIT | ADS_SER) | |
171 | ||
de2defd9 ID |
172 | #define REF_ON (READ_12BIT_DFR(x, 1, 1)) |
173 | #define REF_OFF (READ_12BIT_DFR(y, 0, 0)) | |
ffa458c1 DB |
174 | |
175 | /*--------------------------------------------------------------------------*/ | |
176 | ||
177 | /* | |
178 | * Non-touchscreen sensors only use single-ended conversions. | |
2c8dc071 DB |
179 | * The range is GND..vREF. The ads7843 and ads7835 must use external vREF; |
180 | * ads7846 lets that pin be unconnected, to use internal vREF. | |
ffa458c1 | 181 | */ |
2c8dc071 DB |
182 | static unsigned vREF_mV; |
183 | module_param(vREF_mV, uint, 0); | |
184 | MODULE_PARM_DESC(vREF_mV, "external vREF voltage, in milliVolts"); | |
ffa458c1 DB |
185 | |
186 | struct ser_req { | |
d93f70b2 | 187 | u8 ref_on; |
ffa458c1 | 188 | u8 command; |
d93f70b2 | 189 | u8 ref_off; |
ffa458c1 DB |
190 | u16 scratch; |
191 | __be16 sample; | |
192 | struct spi_message msg; | |
193 | struct spi_transfer xfer[6]; | |
194 | }; | |
195 | ||
7de90a8c ID |
196 | static void ads7846_enable(struct ads7846 *ts); |
197 | static void ads7846_disable(struct ads7846 *ts); | |
198 | ||
c9e617a5 ID |
199 | static int device_suspended(struct device *dev) |
200 | { | |
201 | struct ads7846 *ts = dev_get_drvdata(dev); | |
202 | return dev->power.power_state.event != PM_EVENT_ON || ts->disabled; | |
203 | } | |
204 | ||
ffa458c1 DB |
205 | static int ads7846_read12_ser(struct device *dev, unsigned command) |
206 | { | |
207 | struct spi_device *spi = to_spi_device(dev); | |
208 | struct ads7846 *ts = dev_get_drvdata(dev); | |
e94b1766 | 209 | struct ser_req *req = kzalloc(sizeof *req, GFP_KERNEL); |
ffa458c1 DB |
210 | int status; |
211 | int sample; | |
2c8dc071 | 212 | int use_internal; |
ffa458c1 DB |
213 | |
214 | if (!req) | |
215 | return -ENOMEM; | |
216 | ||
0b7018aa | 217 | spi_message_init(&req->msg); |
8275c642 | 218 | |
2c8dc071 DB |
219 | /* FIXME boards with ads7846 might use external vref instead ... */ |
220 | use_internal = (ts->model == 7846); | |
221 | ||
222 | /* maybe turn on internal vREF, and let it settle */ | |
223 | if (use_internal) { | |
224 | req->ref_on = REF_ON; | |
225 | req->xfer[0].tx_buf = &req->ref_on; | |
226 | req->xfer[0].len = 1; | |
227 | spi_message_add_tail(&req->xfer[0], &req->msg); | |
228 | ||
229 | req->xfer[1].rx_buf = &req->scratch; | |
230 | req->xfer[1].len = 2; | |
231 | ||
232 | /* for 1uF, settle for 800 usec; no cap, 100 usec. */ | |
233 | req->xfer[1].delay_usecs = ts->vref_delay_usecs; | |
234 | spi_message_add_tail(&req->xfer[1], &req->msg); | |
235 | } | |
ffa458c1 DB |
236 | |
237 | /* take sample */ | |
238 | req->command = (u8) command; | |
239 | req->xfer[2].tx_buf = &req->command; | |
240 | req->xfer[2].len = 1; | |
2c8dc071 DB |
241 | spi_message_add_tail(&req->xfer[2], &req->msg); |
242 | ||
ffa458c1 DB |
243 | req->xfer[3].rx_buf = &req->sample; |
244 | req->xfer[3].len = 2; | |
2c8dc071 | 245 | spi_message_add_tail(&req->xfer[3], &req->msg); |
ffa458c1 DB |
246 | |
247 | /* REVISIT: take a few more samples, and compare ... */ | |
248 | ||
2c8dc071 DB |
249 | /* maybe off internal vREF */ |
250 | if (use_internal) { | |
251 | req->ref_off = REF_OFF; | |
252 | req->xfer[4].tx_buf = &req->ref_off; | |
253 | req->xfer[4].len = 1; | |
254 | spi_message_add_tail(&req->xfer[4], &req->msg); | |
255 | ||
256 | req->xfer[5].rx_buf = &req->scratch; | |
257 | req->xfer[5].len = 2; | |
258 | CS_CHANGE(req->xfer[5]); | |
259 | spi_message_add_tail(&req->xfer[5], &req->msg); | |
260 | } | |
ffa458c1 | 261 | |
c9e617a5 | 262 | ts->irq_disabled = 1; |
ffa458c1 DB |
263 | disable_irq(spi->irq); |
264 | status = spi_sync(spi, &req->msg); | |
c9e617a5 | 265 | ts->irq_disabled = 0; |
ffa458c1 DB |
266 | enable_irq(spi->irq); |
267 | ||
268 | if (req->msg.status) | |
269 | status = req->msg.status; | |
9084533e DB |
270 | |
271 | /* on-wire is a must-ignore bit, a BE12 value, then padding */ | |
ffa458c1 | 272 | sample = be16_to_cpu(req->sample); |
9084533e DB |
273 | sample = sample >> 3; |
274 | sample &= 0x0fff; | |
ffa458c1 | 275 | |
9084533e | 276 | kfree(req); |
ffa458c1 DB |
277 | return status ? status : sample; |
278 | } | |
279 | ||
2c8dc071 DB |
280 | #if defined(CONFIG_HWMON) || defined(CONFIG_HWMON_MODULE) |
281 | ||
282 | #define SHOW(name, var, adjust) static ssize_t \ | |
ffa458c1 DB |
283 | name ## _show(struct device *dev, struct device_attribute *attr, char *buf) \ |
284 | { \ | |
2c8dc071 | 285 | struct ads7846 *ts = dev_get_drvdata(dev); \ |
ffa458c1 | 286 | ssize_t v = ads7846_read12_ser(dev, \ |
2c8dc071 | 287 | READ_12BIT_SER(var) | ADS_PD10_ALL_ON); \ |
ffa458c1 DB |
288 | if (v < 0) \ |
289 | return v; \ | |
2c8dc071 | 290 | return sprintf(buf, "%u\n", adjust(ts, v)); \ |
ffa458c1 DB |
291 | } \ |
292 | static DEVICE_ATTR(name, S_IRUGO, name ## _show, NULL); | |
293 | ||
2c8dc071 DB |
294 | |
295 | /* Sysfs conventions report temperatures in millidegrees Celcius. | |
296 | * ADS7846 could use the low-accuracy two-sample scheme, but can't do the high | |
297 | * accuracy scheme without calibration data. For now we won't try either; | |
298 | * userspace sees raw sensor values, and must scale/calibrate appropriately. | |
299 | */ | |
300 | static inline unsigned null_adjust(struct ads7846 *ts, ssize_t v) | |
301 | { | |
302 | return v; | |
303 | } | |
304 | ||
305 | SHOW(temp0, temp0, null_adjust) /* temp1_input */ | |
306 | SHOW(temp1, temp1, null_adjust) /* temp2_input */ | |
307 | ||
308 | ||
309 | /* sysfs conventions report voltages in millivolts. We can convert voltages | |
310 | * if we know vREF. userspace may need to scale vAUX to match the board's | |
311 | * external resistors; we assume that vBATT only uses the internal ones. | |
312 | */ | |
313 | static inline unsigned vaux_adjust(struct ads7846 *ts, ssize_t v) | |
314 | { | |
315 | unsigned retval = v; | |
316 | ||
317 | /* external resistors may scale vAUX into 0..vREF */ | |
318 | retval *= vREF_mV; | |
319 | retval = retval >> 12; | |
320 | return retval; | |
321 | } | |
322 | ||
323 | static inline unsigned vbatt_adjust(struct ads7846 *ts, ssize_t v) | |
324 | { | |
325 | unsigned retval = vaux_adjust(ts, v); | |
326 | ||
327 | /* ads7846 has a resistor ladder to scale this signal down */ | |
328 | if (ts->model == 7846) | |
329 | retval *= 4; | |
330 | return retval; | |
331 | } | |
332 | ||
333 | SHOW(in0_input, vaux, vaux_adjust) | |
334 | SHOW(in1_input, vbatt, vbatt_adjust) | |
335 | ||
336 | ||
337 | static struct attribute *ads7846_attributes[] = { | |
338 | &dev_attr_temp0.attr, | |
339 | &dev_attr_temp1.attr, | |
340 | &dev_attr_in0_input.attr, | |
341 | &dev_attr_in1_input.attr, | |
342 | NULL, | |
343 | }; | |
344 | ||
345 | static struct attribute_group ads7846_attr_group = { | |
346 | .attrs = ads7846_attributes, | |
347 | }; | |
348 | ||
349 | static struct attribute *ads7843_attributes[] = { | |
350 | &dev_attr_in0_input.attr, | |
351 | &dev_attr_in1_input.attr, | |
352 | NULL, | |
353 | }; | |
354 | ||
355 | static struct attribute_group ads7843_attr_group = { | |
356 | .attrs = ads7843_attributes, | |
357 | }; | |
358 | ||
359 | static struct attribute *ads7845_attributes[] = { | |
360 | &dev_attr_in0_input.attr, | |
361 | NULL, | |
362 | }; | |
363 | ||
364 | static struct attribute_group ads7845_attr_group = { | |
365 | .attrs = ads7845_attributes, | |
366 | }; | |
367 | ||
368 | static int ads784x_hwmon_register(struct spi_device *spi, struct ads7846 *ts) | |
369 | { | |
370 | struct class_device *hwmon; | |
371 | int err; | |
372 | ||
373 | /* hwmon sensors need a reference voltage */ | |
374 | switch (ts->model) { | |
375 | case 7846: | |
376 | if (!vREF_mV) { | |
377 | dev_dbg(&spi->dev, "assuming 2.5V internal vREF\n"); | |
378 | vREF_mV = 2500; | |
379 | } | |
380 | break; | |
381 | case 7845: | |
382 | case 7843: | |
383 | if (!vREF_mV) { | |
384 | dev_warn(&spi->dev, | |
385 | "external vREF for ADS%d not specified\n", | |
386 | ts->model); | |
387 | return 0; | |
388 | } | |
389 | break; | |
390 | } | |
391 | ||
392 | /* different chips have different sensor groups */ | |
393 | switch (ts->model) { | |
394 | case 7846: | |
395 | ts->attr_group = &ads7846_attr_group; | |
396 | break; | |
397 | case 7845: | |
398 | ts->attr_group = &ads7845_attr_group; | |
399 | break; | |
400 | case 7843: | |
401 | ts->attr_group = &ads7843_attr_group; | |
402 | break; | |
403 | default: | |
404 | dev_dbg(&spi->dev, "ADS%d not recognized\n", ts->model); | |
405 | return 0; | |
406 | } | |
407 | ||
408 | err = sysfs_create_group(&spi->dev.kobj, ts->attr_group); | |
409 | if (err) | |
410 | return err; | |
411 | ||
412 | hwmon = hwmon_device_register(&spi->dev); | |
413 | if (IS_ERR(hwmon)) { | |
414 | sysfs_remove_group(&spi->dev.kobj, ts->attr_group); | |
415 | return PTR_ERR(hwmon); | |
416 | } | |
417 | ||
418 | ts->hwmon = hwmon; | |
419 | return 0; | |
420 | } | |
421 | ||
422 | static void ads784x_hwmon_unregister(struct spi_device *spi, | |
423 | struct ads7846 *ts) | |
424 | { | |
425 | if (ts->hwmon) { | |
426 | sysfs_remove_group(&spi->dev.kobj, ts->attr_group); | |
427 | hwmon_device_unregister(ts->hwmon); | |
428 | } | |
429 | } | |
430 | ||
431 | #else | |
432 | static inline int ads784x_hwmon_register(struct spi_device *spi, | |
433 | struct ads7846 *ts) | |
434 | { | |
435 | return 0; | |
436 | } | |
437 | ||
438 | static inline void ads784x_hwmon_unregister(struct spi_device *spi, | |
439 | struct ads7846 *ts) | |
440 | { | |
441 | } | |
442 | #endif | |
ffa458c1 | 443 | |
438f2a74 ID |
444 | static int is_pen_down(struct device *dev) |
445 | { | |
2c8dc071 | 446 | struct ads7846 *ts = dev_get_drvdata(dev); |
438f2a74 ID |
447 | |
448 | return ts->pendown; | |
449 | } | |
450 | ||
451 | static ssize_t ads7846_pen_down_show(struct device *dev, | |
452 | struct device_attribute *attr, char *buf) | |
453 | { | |
454 | return sprintf(buf, "%u\n", is_pen_down(dev)); | |
455 | } | |
456 | ||
457 | static DEVICE_ATTR(pen_down, S_IRUGO, ads7846_pen_down_show, NULL); | |
458 | ||
7de90a8c ID |
459 | static ssize_t ads7846_disable_show(struct device *dev, |
460 | struct device_attribute *attr, char *buf) | |
461 | { | |
462 | struct ads7846 *ts = dev_get_drvdata(dev); | |
463 | ||
464 | return sprintf(buf, "%u\n", ts->disabled); | |
465 | } | |
466 | ||
467 | static ssize_t ads7846_disable_store(struct device *dev, | |
468 | struct device_attribute *attr, | |
469 | const char *buf, size_t count) | |
470 | { | |
471 | struct ads7846 *ts = dev_get_drvdata(dev); | |
472 | char *endp; | |
473 | int i; | |
474 | ||
475 | i = simple_strtoul(buf, &endp, 10); | |
476 | spin_lock_irq(&ts->lock); | |
477 | ||
478 | if (i) | |
479 | ads7846_disable(ts); | |
480 | else | |
481 | ads7846_enable(ts); | |
482 | ||
483 | spin_unlock_irq(&ts->lock); | |
484 | ||
485 | return count; | |
486 | } | |
487 | ||
488 | static DEVICE_ATTR(disable, 0664, ads7846_disable_show, ads7846_disable_store); | |
489 | ||
2c8dc071 | 490 | static struct attribute *ads784x_attributes[] = { |
8dd51650 DT |
491 | &dev_attr_pen_down.attr, |
492 | &dev_attr_disable.attr, | |
493 | NULL, | |
494 | }; | |
495 | ||
2c8dc071 DB |
496 | static struct attribute_group ads784x_attr_group = { |
497 | .attrs = ads784x_attributes, | |
8dd51650 DT |
498 | }; |
499 | ||
ffa458c1 DB |
500 | /*--------------------------------------------------------------------------*/ |
501 | ||
502 | /* | |
503 | * PENIRQ only kicks the timer. The timer only reissues the SPI transfer, | |
504 | * to retrieve touchscreen status. | |
505 | * | |
506 | * The SPI transfer completion callback does the real work. It reports | |
507 | * touchscreen events and reactivates the timer (or IRQ) as appropriate. | |
508 | */ | |
509 | ||
510 | static void ads7846_rx(void *ads) | |
511 | { | |
a90f7e98 | 512 | struct ads7846 *ts = ads; |
a90f7e98 | 513 | unsigned Rt; |
a90f7e98 | 514 | u16 x, y, z1, z2; |
ffa458c1 | 515 | |
da970e69 ID |
516 | /* ads7846_rx_val() did in-place conversion (including byteswap) from |
517 | * on-the-wire format as part of debouncing to get stable readings. | |
ffa458c1 | 518 | */ |
da970e69 ID |
519 | x = ts->tc.x; |
520 | y = ts->tc.y; | |
521 | z1 = ts->tc.z1; | |
522 | z2 = ts->tc.z2; | |
ffa458c1 DB |
523 | |
524 | /* range filtering */ | |
525 | if (x == MAX_12BIT) | |
526 | x = 0; | |
527 | ||
15e3589e | 528 | if (likely(x && z1)) { |
ffa458c1 DB |
529 | /* compute touch pressure resistance using equation #2 */ |
530 | Rt = z2; | |
531 | Rt -= z1; | |
532 | Rt *= x; | |
533 | Rt *= ts->x_plate_ohms; | |
534 | Rt /= z1; | |
535 | Rt = (Rt + 2047) >> 12; | |
536 | } else | |
537 | Rt = 0; | |
538 | ||
d5b415c9 | 539 | /* Sample found inconsistent by debouncing or pressure is beyond |
1936d590 ID |
540 | * the maximum. Don't report it to user space, repeat at least |
541 | * once more the measurement | |
542 | */ | |
d5b415c9 | 543 | if (ts->tc.ignore || Rt > ts->pressure_max) { |
15e3589e ID |
544 | #ifdef VERBOSE |
545 | pr_debug("%s: ignored %d pressure %d\n", | |
546 | ts->spi->dev.bus_id, ts->tc.ignore, Rt); | |
547 | #endif | |
1936d590 | 548 | hrtimer_start(&ts->timer, ktime_set(0, TS_POLL_PERIOD), |
c9cb2e3d | 549 | HRTIMER_MODE_REL); |
d5b415c9 ID |
550 | return; |
551 | } | |
552 | ||
15e3589e ID |
553 | /* NOTE: We can't rely on the pressure to determine the pen down |
554 | * state, even this controller has a pressure sensor. The pressure | |
555 | * value can fluctuate for quite a while after lifting the pen and | |
556 | * in some cases may not even settle at the expected value. | |
ffa458c1 | 557 | * |
15e3589e ID |
558 | * The only safe way to check for the pen up condition is in the |
559 | * timer by reading the pen signal state (it's a GPIO _and_ IRQ). | |
ffa458c1 | 560 | */ |
ffa458c1 | 561 | if (Rt) { |
15e3589e | 562 | struct input_dev *input = ts->input; |
ae82d5ab | 563 | |
15e3589e ID |
564 | if (!ts->pendown) { |
565 | input_report_key(input, BTN_TOUCH, 1); | |
566 | ts->pendown = 1; | |
567 | #ifdef VERBOSE | |
568 | dev_dbg(&ts->spi->dev, "DOWN\n"); | |
ffa458c1 | 569 | #endif |
15e3589e ID |
570 | } |
571 | input_report_abs(input, ABS_X, x); | |
572 | input_report_abs(input, ABS_Y, y); | |
573 | input_report_abs(input, ABS_PRESSURE, Rt); | |
ffa458c1 | 574 | |
15e3589e ID |
575 | input_sync(input); |
576 | #ifdef VERBOSE | |
577 | dev_dbg(&ts->spi->dev, "%4d/%4d/%4d\n", x, y, Rt); | |
578 | #endif | |
579 | } | |
ffa458c1 | 580 | |
c9cb2e3d TG |
581 | hrtimer_start(&ts->timer, ktime_set(0, TS_POLL_PERIOD), |
582 | HRTIMER_MODE_REL); | |
ffa458c1 DB |
583 | } |
584 | ||
da970e69 | 585 | static int ads7846_debounce(void *ads, int data_idx, int *val) |
0b7018aa ID |
586 | { |
587 | struct ads7846 *ts = ads; | |
0b7018aa | 588 | |
da970e69 ID |
589 | if (!ts->read_cnt || (abs(ts->last_read - *val) > ts->debounce_tol)) { |
590 | /* Start over collecting consistent readings. */ | |
591 | ts->read_rep = 0; | |
d5b415c9 ID |
592 | /* Repeat it, if this was the first read or the read |
593 | * wasn't consistent enough. */ | |
594 | if (ts->read_cnt < ts->debounce_max) { | |
da970e69 | 595 | ts->last_read = *val; |
d5b415c9 | 596 | ts->read_cnt++; |
da970e69 | 597 | return ADS7846_FILTER_REPEAT; |
d5b415c9 ID |
598 | } else { |
599 | /* Maximum number of debouncing reached and still | |
600 | * not enough number of consistent readings. Abort | |
601 | * the whole sample, repeat it in the next sampling | |
602 | * period. | |
603 | */ | |
d5b415c9 | 604 | ts->read_cnt = 0; |
da970e69 | 605 | return ADS7846_FILTER_IGNORE; |
d5b415c9 | 606 | } |
0b7018aa | 607 | } else { |
d5b415c9 ID |
608 | if (++ts->read_rep > ts->debounce_rep) { |
609 | /* Got a good reading for this coordinate, | |
610 | * go for the next one. */ | |
d5b415c9 ID |
611 | ts->read_cnt = 0; |
612 | ts->read_rep = 0; | |
da970e69 ID |
613 | return ADS7846_FILTER_OK; |
614 | } else { | |
d5b415c9 ID |
615 | /* Read more values that are consistent. */ |
616 | ts->read_cnt++; | |
da970e69 ID |
617 | return ADS7846_FILTER_REPEAT; |
618 | } | |
619 | } | |
620 | } | |
621 | ||
622 | static int ads7846_no_filter(void *ads, int data_idx, int *val) | |
623 | { | |
624 | return ADS7846_FILTER_OK; | |
625 | } | |
626 | ||
627 | static void ads7846_rx_val(void *ads) | |
628 | { | |
629 | struct ads7846 *ts = ads; | |
630 | struct spi_message *m; | |
631 | struct spi_transfer *t; | |
632 | u16 *rx_val; | |
633 | int val; | |
634 | int action; | |
635 | int status; | |
636 | ||
637 | m = &ts->msg[ts->msg_idx]; | |
638 | t = list_entry(m->transfers.prev, struct spi_transfer, transfer_list); | |
639 | rx_val = t->rx_buf; | |
640 | ||
641 | /* adjust: on-wire is a must-ignore bit, a BE12 value, then padding; | |
642 | * built from two 8 bit values written msb-first. | |
643 | */ | |
644 | val = be16_to_cpu(*rx_val) >> 3; | |
645 | ||
646 | action = ts->filter(ts->filter_data, ts->msg_idx, &val); | |
647 | switch (action) { | |
648 | case ADS7846_FILTER_REPEAT: | |
649 | break; | |
650 | case ADS7846_FILTER_IGNORE: | |
651 | ts->tc.ignore = 1; | |
652 | /* Last message will contain ads7846_rx() as the | |
653 | * completion function. | |
654 | */ | |
655 | m = ts->last_msg; | |
656 | break; | |
657 | case ADS7846_FILTER_OK: | |
658 | *rx_val = val; | |
659 | ts->tc.ignore = 0; | |
660 | m = &ts->msg[++ts->msg_idx]; | |
661 | break; | |
662 | default: | |
663 | BUG(); | |
0b7018aa ID |
664 | } |
665 | status = spi_async(ts->spi, m); | |
666 | if (status) | |
667 | dev_err(&ts->spi->dev, "spi_async --> %d\n", | |
668 | status); | |
669 | } | |
670 | ||
c9cb2e3d | 671 | static enum hrtimer_restart ads7846_timer(struct hrtimer *handle) |
ffa458c1 | 672 | { |
1936d590 | 673 | struct ads7846 *ts = container_of(handle, struct ads7846, timer); |
ffa458c1 | 674 | int status = 0; |
0b7018aa | 675 | |
c9e617a5 ID |
676 | spin_lock_irq(&ts->lock); |
677 | ||
15e3589e ID |
678 | if (unlikely(!ts->get_pendown_state() || |
679 | device_suspended(&ts->spi->dev))) { | |
680 | if (ts->pendown) { | |
681 | struct input_dev *input = ts->input; | |
682 | ||
683 | input_report_key(input, BTN_TOUCH, 0); | |
684 | input_report_abs(input, ABS_PRESSURE, 0); | |
685 | input_sync(input); | |
686 | ||
687 | ts->pendown = 0; | |
688 | #ifdef VERBOSE | |
689 | dev_dbg(&ts->spi->dev, "UP\n"); | |
690 | #endif | |
691 | } | |
692 | ||
9084533e | 693 | /* measurement cycle ended */ |
c9e617a5 ID |
694 | if (!device_suspended(&ts->spi->dev)) { |
695 | ts->irq_disabled = 0; | |
696 | enable_irq(ts->spi->irq); | |
697 | } | |
698 | ts->pending = 0; | |
c9e617a5 ID |
699 | } else { |
700 | /* pen is still down, continue with the measurement */ | |
701 | ts->msg_idx = 0; | |
702 | status = spi_async(ts->spi, &ts->msg[0]); | |
703 | if (status) | |
704 | dev_err(&ts->spi->dev, "spi_async --> %d\n", status); | |
705 | } | |
706 | ||
707 | spin_unlock_irq(&ts->lock); | |
1936d590 | 708 | return HRTIMER_NORESTART; |
0b7018aa ID |
709 | } |
710 | ||
7d12e780 | 711 | static irqreturn_t ads7846_irq(int irq, void *handle) |
0b7018aa ID |
712 | { |
713 | struct ads7846 *ts = handle; | |
714 | unsigned long flags; | |
ffa458c1 DB |
715 | |
716 | spin_lock_irqsave(&ts->lock, flags); | |
c9e617a5 | 717 | if (likely(ts->get_pendown_state())) { |
ffa458c1 | 718 | if (!ts->irq_disabled) { |
9084533e DB |
719 | /* The ARM do_simple_IRQ() dispatcher doesn't act |
720 | * like the other dispatchers: it will report IRQs | |
721 | * even after they've been disabled. We work around | |
722 | * that here. (The "generic irq" framework may help...) | |
0b7018aa | 723 | */ |
ffa458c1 DB |
724 | ts->irq_disabled = 1; |
725 | disable_irq(ts->spi->irq); | |
0b7018aa | 726 | ts->pending = 1; |
1936d590 | 727 | hrtimer_start(&ts->timer, ktime_set(0, TS_POLL_DELAY), |
c9cb2e3d | 728 | HRTIMER_MODE_REL); |
0b7018aa | 729 | } |
ffa458c1 DB |
730 | } |
731 | spin_unlock_irqrestore(&ts->lock, flags); | |
7de90a8c ID |
732 | |
733 | return IRQ_HANDLED; | |
ffa458c1 DB |
734 | } |
735 | ||
736 | /*--------------------------------------------------------------------------*/ | |
737 | ||
7de90a8c ID |
738 | /* Must be called with ts->lock held */ |
739 | static void ads7846_disable(struct ads7846 *ts) | |
ffa458c1 | 740 | { |
7de90a8c ID |
741 | if (ts->disabled) |
742 | return; | |
ffa458c1 | 743 | |
c9e617a5 ID |
744 | ts->disabled = 1; |
745 | ||
ffa458c1 | 746 | /* are we waiting for IRQ, or polling? */ |
c9e617a5 ID |
747 | if (!ts->pending) { |
748 | ts->irq_disabled = 1; | |
749 | disable_irq(ts->spi->irq); | |
ffa458c1 | 750 | } else { |
c9e617a5 ID |
751 | /* the timer will run at least once more, and |
752 | * leave everything in a clean state, IRQ disabled | |
ffa458c1 | 753 | */ |
c9e617a5 | 754 | while (ts->pending) { |
7de90a8c | 755 | spin_unlock_irq(&ts->lock); |
c4febb94 | 756 | msleep(1); |
7de90a8c | 757 | spin_lock_irq(&ts->lock); |
ffa458c1 DB |
758 | } |
759 | } | |
760 | ||
761 | /* we know the chip's in lowpower mode since we always | |
762 | * leave it that way after every request | |
763 | */ | |
764 | ||
7de90a8c ID |
765 | } |
766 | ||
767 | /* Must be called with ts->lock held */ | |
768 | static void ads7846_enable(struct ads7846 *ts) | |
769 | { | |
770 | if (!ts->disabled) | |
771 | return; | |
772 | ||
773 | ts->disabled = 0; | |
774 | ts->irq_disabled = 0; | |
775 | enable_irq(ts->spi->irq); | |
776 | } | |
777 | ||
778 | static int ads7846_suspend(struct spi_device *spi, pm_message_t message) | |
779 | { | |
780 | struct ads7846 *ts = dev_get_drvdata(&spi->dev); | |
781 | ||
782 | spin_lock_irq(&ts->lock); | |
783 | ||
784 | spi->dev.power.power_state = message; | |
785 | ads7846_disable(ts); | |
786 | ||
787 | spin_unlock_irq(&ts->lock); | |
788 | ||
ffa458c1 | 789 | return 0; |
7de90a8c | 790 | |
ffa458c1 DB |
791 | } |
792 | ||
2e5a7bd9 | 793 | static int ads7846_resume(struct spi_device *spi) |
ffa458c1 | 794 | { |
2e5a7bd9 | 795 | struct ads7846 *ts = dev_get_drvdata(&spi->dev); |
ffa458c1 | 796 | |
7de90a8c ID |
797 | spin_lock_irq(&ts->lock); |
798 | ||
2e5a7bd9 | 799 | spi->dev.power.power_state = PMSG_ON; |
7de90a8c ID |
800 | ads7846_enable(ts); |
801 | ||
802 | spin_unlock_irq(&ts->lock); | |
803 | ||
ffa458c1 DB |
804 | return 0; |
805 | } | |
806 | ||
2e5a7bd9 | 807 | static int __devinit ads7846_probe(struct spi_device *spi) |
ffa458c1 | 808 | { |
ffa458c1 | 809 | struct ads7846 *ts; |
a90f7e98 | 810 | struct input_dev *input_dev; |
2e5a7bd9 | 811 | struct ads7846_platform_data *pdata = spi->dev.platform_data; |
0b7018aa | 812 | struct spi_message *m; |
ffa458c1 | 813 | struct spi_transfer *x; |
de2defd9 | 814 | int vref; |
a90f7e98 | 815 | int err; |
ffa458c1 DB |
816 | |
817 | if (!spi->irq) { | |
2e5a7bd9 | 818 | dev_dbg(&spi->dev, "no IRQ?\n"); |
ffa458c1 DB |
819 | return -ENODEV; |
820 | } | |
821 | ||
822 | if (!pdata) { | |
2e5a7bd9 | 823 | dev_dbg(&spi->dev, "no platform data?\n"); |
ffa458c1 DB |
824 | return -ENODEV; |
825 | } | |
826 | ||
827 | /* don't exceed max specified sample rate */ | |
d93f70b2 | 828 | if (spi->max_speed_hz > (125000 * SAMPLE_BITS)) { |
2e5a7bd9 | 829 | dev_dbg(&spi->dev, "f(sample) %d KHz?\n", |
d93f70b2 | 830 | (spi->max_speed_hz/SAMPLE_BITS)/1000); |
ffa458c1 DB |
831 | return -EINVAL; |
832 | } | |
833 | ||
9084533e DB |
834 | /* REVISIT when the irq can be triggered active-low, or if for some |
835 | * reason the touchscreen isn't hooked up, we don't need to access | |
836 | * the pendown state. | |
837 | */ | |
c9e617a5 ID |
838 | if (pdata->get_pendown_state == NULL) { |
839 | dev_dbg(&spi->dev, "no get_pendown_state function?\n"); | |
840 | return -EINVAL; | |
841 | } | |
842 | ||
9084533e DB |
843 | /* We'd set TX wordsize 8 bits and RX wordsize to 13 bits ... except |
844 | * that even if the hardware can do that, the SPI controller driver | |
845 | * may not. So we stick to very-portable 8 bit words, both RX and TX. | |
ffa458c1 | 846 | */ |
9084533e | 847 | spi->bits_per_word = 8; |
7937e86a ID |
848 | spi->mode = SPI_MODE_1; |
849 | err = spi_setup(spi); | |
850 | if (err < 0) | |
851 | return err; | |
ffa458c1 | 852 | |
a90f7e98 DT |
853 | ts = kzalloc(sizeof(struct ads7846), GFP_KERNEL); |
854 | input_dev = input_allocate_device(); | |
855 | if (!ts || !input_dev) { | |
856 | err = -ENOMEM; | |
857 | goto err_free_mem; | |
858 | } | |
ffa458c1 | 859 | |
2e5a7bd9 | 860 | dev_set_drvdata(&spi->dev, ts); |
a90f7e98 | 861 | spi->dev.power.power_state = PMSG_ON; |
ffa458c1 DB |
862 | |
863 | ts->spi = spi; | |
a90f7e98 | 864 | ts->input = input_dev; |
ffa458c1 | 865 | |
c9cb2e3d | 866 | hrtimer_init(&ts->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); |
ffa458c1 DB |
867 | ts->timer.function = ads7846_timer; |
868 | ||
7de90a8c ID |
869 | spin_lock_init(&ts->lock); |
870 | ||
ffa458c1 DB |
871 | ts->model = pdata->model ? : 7846; |
872 | ts->vref_delay_usecs = pdata->vref_delay_usecs ? : 100; | |
873 | ts->x_plate_ohms = pdata->x_plate_ohms ? : 400; | |
d5b415c9 | 874 | ts->pressure_max = pdata->pressure_max ? : ~0; |
da970e69 ID |
875 | |
876 | if (pdata->filter != NULL) { | |
877 | if (pdata->filter_init != NULL) { | |
878 | err = pdata->filter_init(pdata, &ts->filter_data); | |
879 | if (err < 0) | |
880 | goto err_free_mem; | |
881 | } | |
882 | ts->filter = pdata->filter; | |
883 | ts->filter_cleanup = pdata->filter_cleanup; | |
884 | } else if (pdata->debounce_max) { | |
d5b415c9 | 885 | ts->debounce_max = pdata->debounce_max; |
da970e69 ID |
886 | if (ts->debounce_max < 2) |
887 | ts->debounce_max = 2; | |
d5b415c9 ID |
888 | ts->debounce_tol = pdata->debounce_tol; |
889 | ts->debounce_rep = pdata->debounce_rep; | |
da970e69 ID |
890 | ts->filter = ads7846_debounce; |
891 | ts->filter_data = ts; | |
d5b415c9 | 892 | } else |
da970e69 | 893 | ts->filter = ads7846_no_filter; |
c9e617a5 | 894 | ts->get_pendown_state = pdata->get_pendown_state; |
ffa458c1 | 895 | |
a90f7e98 | 896 | snprintf(ts->phys, sizeof(ts->phys), "%s/input0", spi->dev.bus_id); |
ffa458c1 | 897 | |
a90f7e98 DT |
898 | input_dev->name = "ADS784x Touchscreen"; |
899 | input_dev->phys = ts->phys; | |
900 | input_dev->cdev.dev = &spi->dev; | |
ffa458c1 | 901 | |
a90f7e98 DT |
902 | input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_ABS); |
903 | input_dev->keybit[LONG(BTN_TOUCH)] = BIT(BTN_TOUCH); | |
904 | input_set_abs_params(input_dev, ABS_X, | |
ffa458c1 DB |
905 | pdata->x_min ? : 0, |
906 | pdata->x_max ? : MAX_12BIT, | |
907 | 0, 0); | |
a90f7e98 | 908 | input_set_abs_params(input_dev, ABS_Y, |
ffa458c1 DB |
909 | pdata->y_min ? : 0, |
910 | pdata->y_max ? : MAX_12BIT, | |
911 | 0, 0); | |
a90f7e98 | 912 | input_set_abs_params(input_dev, ABS_PRESSURE, |
ffa458c1 DB |
913 | pdata->pressure_min, pdata->pressure_max, 0, 0); |
914 | ||
de2defd9 ID |
915 | vref = pdata->keep_vref_on; |
916 | ||
ffa458c1 DB |
917 | /* set up the transfers to read touchscreen state; this assumes we |
918 | * use formula #2 for pressure, not #3. | |
919 | */ | |
0b7018aa | 920 | m = &ts->msg[0]; |
ffa458c1 DB |
921 | x = ts->xfer; |
922 | ||
0b7018aa ID |
923 | spi_message_init(m); |
924 | ||
ffa458c1 | 925 | /* y- still on; turn on only y+ (and ADC) */ |
de2defd9 | 926 | ts->read_y = READ_Y(vref); |
d93f70b2 | 927 | x->tx_buf = &ts->read_y; |
ffa458c1 | 928 | x->len = 1; |
0b7018aa | 929 | spi_message_add_tail(x, m); |
d93f70b2 | 930 | |
ffa458c1 DB |
931 | x++; |
932 | x->rx_buf = &ts->tc.y; | |
933 | x->len = 2; | |
0b7018aa ID |
934 | spi_message_add_tail(x, m); |
935 | ||
da970e69 | 936 | m->complete = ads7846_rx_val; |
0b7018aa ID |
937 | m->context = ts; |
938 | ||
939 | m++; | |
940 | spi_message_init(m); | |
941 | ||
942 | /* turn y- off, x+ on, then leave in lowpower */ | |
943 | x++; | |
de2defd9 | 944 | ts->read_x = READ_X(vref); |
0b7018aa ID |
945 | x->tx_buf = &ts->read_x; |
946 | x->len = 1; | |
947 | spi_message_add_tail(x, m); | |
948 | ||
949 | x++; | |
950 | x->rx_buf = &ts->tc.x; | |
951 | x->len = 2; | |
952 | spi_message_add_tail(x, m); | |
953 | ||
da970e69 | 954 | m->complete = ads7846_rx_val; |
0b7018aa | 955 | m->context = ts; |
ffa458c1 DB |
956 | |
957 | /* turn y+ off, x- on; we'll use formula #2 */ | |
958 | if (ts->model == 7846) { | |
0b7018aa ID |
959 | m++; |
960 | spi_message_init(m); | |
961 | ||
d93f70b2 | 962 | x++; |
de2defd9 | 963 | ts->read_z1 = READ_Z1(vref); |
d93f70b2 | 964 | x->tx_buf = &ts->read_z1; |
ffa458c1 | 965 | x->len = 1; |
0b7018aa | 966 | spi_message_add_tail(x, m); |
d93f70b2 | 967 | |
ffa458c1 DB |
968 | x++; |
969 | x->rx_buf = &ts->tc.z1; | |
970 | x->len = 2; | |
0b7018aa ID |
971 | spi_message_add_tail(x, m); |
972 | ||
da970e69 | 973 | m->complete = ads7846_rx_val; |
0b7018aa ID |
974 | m->context = ts; |
975 | ||
976 | m++; | |
977 | spi_message_init(m); | |
ffa458c1 | 978 | |
d93f70b2 | 979 | x++; |
de2defd9 | 980 | ts->read_z2 = READ_Z2(vref); |
d93f70b2 | 981 | x->tx_buf = &ts->read_z2; |
ffa458c1 | 982 | x->len = 1; |
0b7018aa | 983 | spi_message_add_tail(x, m); |
d93f70b2 | 984 | |
ffa458c1 DB |
985 | x++; |
986 | x->rx_buf = &ts->tc.z2; | |
987 | x->len = 2; | |
0b7018aa | 988 | spi_message_add_tail(x, m); |
ffa458c1 | 989 | |
da970e69 | 990 | m->complete = ads7846_rx_val; |
0b7018aa ID |
991 | m->context = ts; |
992 | } | |
53a0ef89 ID |
993 | |
994 | /* power down */ | |
0b7018aa ID |
995 | m++; |
996 | spi_message_init(m); | |
997 | ||
53a0ef89 ID |
998 | x++; |
999 | ts->pwrdown = PWRDOWN; | |
1000 | x->tx_buf = &ts->pwrdown; | |
1001 | x->len = 1; | |
0b7018aa | 1002 | spi_message_add_tail(x, m); |
53a0ef89 ID |
1003 | |
1004 | x++; | |
1005 | x->rx_buf = &ts->dummy; | |
1006 | x->len = 2; | |
d93f70b2 | 1007 | CS_CHANGE(*x); |
0b7018aa | 1008 | spi_message_add_tail(x, m); |
ffa458c1 | 1009 | |
0b7018aa ID |
1010 | m->complete = ads7846_rx; |
1011 | m->context = ts; | |
ffa458c1 | 1012 | |
d5b415c9 ID |
1013 | ts->last_msg = m; |
1014 | ||
dace1453 | 1015 | if (request_irq(spi->irq, ads7846_irq, IRQF_TRIGGER_FALLING, |
9084533e | 1016 | spi->dev.driver->name, ts)) { |
2e5a7bd9 | 1017 | dev_dbg(&spi->dev, "irq %d busy?\n", spi->irq); |
a90f7e98 | 1018 | err = -EBUSY; |
da970e69 | 1019 | goto err_cleanup_filter; |
ffa458c1 | 1020 | } |
ffa458c1 | 1021 | |
2c8dc071 DB |
1022 | err = ads784x_hwmon_register(spi, ts); |
1023 | if (err) | |
1024 | goto err_free_irq; | |
1025 | ||
2e5a7bd9 | 1026 | dev_info(&spi->dev, "touchscreen, irq %d\n", spi->irq); |
ffa458c1 | 1027 | |
2c8dc071 | 1028 | /* take a first sample, leaving nPENIRQ active and vREF off; avoid |
ffa458c1 DB |
1029 | * the touchscreen, in case it's not connected. |
1030 | */ | |
2e5a7bd9 | 1031 | (void) ads7846_read12_ser(&spi->dev, |
ffa458c1 DB |
1032 | READ_12BIT_SER(vaux) | ADS_PD10_ALL_ON); |
1033 | ||
2c8dc071 | 1034 | err = sysfs_create_group(&spi->dev.kobj, &ads784x_attr_group); |
8dd51650 | 1035 | if (err) |
2c8dc071 | 1036 | goto err_remove_hwmon; |
7de90a8c | 1037 | |
a90f7e98 DT |
1038 | err = input_register_device(input_dev); |
1039 | if (err) | |
8dd51650 | 1040 | goto err_remove_attr_group; |
a90f7e98 | 1041 | |
ffa458c1 | 1042 | return 0; |
a90f7e98 | 1043 | |
8dd51650 | 1044 | err_remove_attr_group: |
2c8dc071 DB |
1045 | sysfs_remove_group(&spi->dev.kobj, &ads784x_attr_group); |
1046 | err_remove_hwmon: | |
1047 | ads784x_hwmon_unregister(spi, ts); | |
8dd51650 | 1048 | err_free_irq: |
a90f7e98 | 1049 | free_irq(spi->irq, ts); |
da970e69 ID |
1050 | err_cleanup_filter: |
1051 | if (ts->filter_cleanup) | |
1052 | ts->filter_cleanup(ts->filter_data); | |
a90f7e98 DT |
1053 | err_free_mem: |
1054 | input_free_device(input_dev); | |
1055 | kfree(ts); | |
1056 | return err; | |
ffa458c1 DB |
1057 | } |
1058 | ||
2e5a7bd9 | 1059 | static int __devexit ads7846_remove(struct spi_device *spi) |
ffa458c1 | 1060 | { |
2e5a7bd9 | 1061 | struct ads7846 *ts = dev_get_drvdata(&spi->dev); |
ffa458c1 | 1062 | |
2c8dc071 | 1063 | ads784x_hwmon_unregister(spi, ts); |
7de90a8c ID |
1064 | input_unregister_device(ts->input); |
1065 | ||
2e5a7bd9 | 1066 | ads7846_suspend(spi, PMSG_SUSPEND); |
ffa458c1 | 1067 | |
2c8dc071 | 1068 | sysfs_remove_group(&spi->dev.kobj, &ads784x_attr_group); |
ffa458c1 | 1069 | |
7de90a8c | 1070 | free_irq(ts->spi->irq, ts); |
c9e617a5 ID |
1071 | /* suspend left the IRQ disabled */ |
1072 | enable_irq(ts->spi->irq); | |
7de90a8c | 1073 | |
da970e69 ID |
1074 | if (ts->filter_cleanup) |
1075 | ts->filter_cleanup(ts->filter_data); | |
1076 | ||
ffa458c1 DB |
1077 | kfree(ts); |
1078 | ||
2e5a7bd9 | 1079 | dev_dbg(&spi->dev, "unregistered touchscreen\n"); |
ffa458c1 DB |
1080 | return 0; |
1081 | } | |
1082 | ||
2e5a7bd9 DB |
1083 | static struct spi_driver ads7846_driver = { |
1084 | .driver = { | |
1085 | .name = "ads7846", | |
1086 | .bus = &spi_bus_type, | |
1087 | .owner = THIS_MODULE, | |
1088 | }, | |
ffa458c1 | 1089 | .probe = ads7846_probe, |
2e5a7bd9 | 1090 | .remove = __devexit_p(ads7846_remove), |
ffa458c1 DB |
1091 | .suspend = ads7846_suspend, |
1092 | .resume = ads7846_resume, | |
1093 | }; | |
1094 | ||
1095 | static int __init ads7846_init(void) | |
1096 | { | |
1097 | /* grr, board-specific init should stay out of drivers!! */ | |
1098 | ||
1099 | #ifdef CONFIG_ARCH_OMAP | |
1100 | if (machine_is_omap_osk()) { | |
1101 | /* GPIO4 = PENIRQ; GPIO6 = BUSY */ | |
1102 | omap_request_gpio(4); | |
1103 | omap_set_gpio_direction(4, 1); | |
1104 | omap_request_gpio(6); | |
1105 | omap_set_gpio_direction(6, 1); | |
1106 | } | |
1107 | // also TI 1510 Innovator, bitbanging through FPGA | |
1108 | // also Nokia 770 | |
1109 | // also Palm Tungsten T2 | |
1110 | #endif | |
1111 | ||
1112 | // PXA: | |
1113 | // also Dell Axim X50 | |
1114 | // also HP iPaq H191x/H192x/H415x/H435x | |
2e5a7bd9 | 1115 | // also Intel Lubbock (additional to UCB1400; as temperature sensor) |
ffa458c1 DB |
1116 | // also Sharp Zaurus C7xx, C8xx (corgi/sheperd/husky) |
1117 | ||
2e5a7bd9 DB |
1118 | // Atmel at91sam9261-EK uses ads7843 |
1119 | ||
ffa458c1 DB |
1120 | // also various AMD Au1x00 devel boards |
1121 | ||
2e5a7bd9 | 1122 | return spi_register_driver(&ads7846_driver); |
ffa458c1 DB |
1123 | } |
1124 | module_init(ads7846_init); | |
1125 | ||
1126 | static void __exit ads7846_exit(void) | |
1127 | { | |
2e5a7bd9 | 1128 | spi_unregister_driver(&ads7846_driver); |
ffa458c1 DB |
1129 | |
1130 | #ifdef CONFIG_ARCH_OMAP | |
1131 | if (machine_is_omap_osk()) { | |
1132 | omap_free_gpio(4); | |
1133 | omap_free_gpio(6); | |
1134 | } | |
1135 | #endif | |
1136 | ||
1137 | } | |
1138 | module_exit(ads7846_exit); | |
1139 | ||
1140 | MODULE_DESCRIPTION("ADS7846 TouchScreen Driver"); | |
1141 | MODULE_LICENSE("GPL"); |