Root/target/linux/omap24xx/patches-2.6.38/600-tsc2005.patch

1---
2 drivers/input/touchscreen/Kconfig | 11
3 drivers/input/touchscreen/Makefile | 1
4 drivers/input/touchscreen/tsc2005.c | 958 ++++++++++++++++++++++++++++++++++++
5 include/linux/spi/tsc2005.h | 30 +
6 4 files changed, 1000 insertions(+)
7
8--- a/drivers/input/touchscreen/Kconfig
9+++ b/drivers/input/touchscreen/Kconfig
10@@ -629,6 +629,17 @@ config TOUCHSCREEN_TOUCHIT213
11       To compile this driver as a module, choose M here: the
12       module will be called touchit213.
13 
14+config TOUCHSCREEN_TSC2005
15+ tristate "TSC2005 based touchscreens"
16+ depends on SPI_MASTER
17+ help
18+ Say Y here if you have a TSC2005 based touchscreen.
19+
20+ If unsure, say N.
21+
22+ To compile this driver as a module, choose M here: the
23+ module will be called tsc2005.
24+
25 config TOUCHSCREEN_TSC2007
26     tristate "TSC2007 based touchscreens"
27     depends on I2C
28--- a/drivers/input/touchscreen/Makefile
29+++ b/drivers/input/touchscreen/Makefile
30@@ -45,6 +45,7 @@ obj-$(CONFIG_TOUCHSCREEN_TNETV107X) += t
31 obj-$(CONFIG_TOUCHSCREEN_TOUCHIT213) += touchit213.o
32 obj-$(CONFIG_TOUCHSCREEN_TOUCHRIGHT) += touchright.o
33 obj-$(CONFIG_TOUCHSCREEN_TOUCHWIN) += touchwin.o
34+obj-$(CONFIG_TOUCHSCREEN_TSC2005) += tsc2005.o
35 obj-$(CONFIG_TOUCHSCREEN_TSC2007) += tsc2007.o
36 obj-$(CONFIG_TOUCHSCREEN_UCB1400) += ucb1400_ts.o
37 obj-$(CONFIG_TOUCHSCREEN_WACOM_W8001) += wacom_w8001.o
38--- /dev/null
39+++ b/drivers/input/touchscreen/tsc2005.c
40@@ -0,0 +1,958 @@
41+/*
42+ * TSC2005 touchscreen driver
43+ *
44+ * Copyright (C) 2006-2008 Nokia Corporation
45+ *
46+ * Author: Lauri Leukkunen <lauri.leukkunen@nokia.com>
47+ * based on TSC2301 driver by Klaus K. Pedersen <klaus.k.pedersen@nokia.com>
48+ *
49+ * This program is free software; you can redistribute it and/or modify
50+ * it under the terms of the GNU General Public License as published by
51+ * the Free Software Foundation; either version 2 of the License, or
52+ * (at your option) any later version.
53+ *
54+ * This program is distributed in the hope that it will be useful,
55+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
56+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
57+ * GNU General Public License for more details.
58+ *
59+ * You should have received a copy of the GNU General Public License
60+ * along with this program; if not, write to the Free Software
61+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
62+ *
63+ */
64+
65+#include <linux/kernel.h>
66+#include <linux/module.h>
67+#include <linux/input.h>
68+#include <linux/interrupt.h>
69+#include <linux/delay.h>
70+#include <linux/spi/spi.h>
71+
72+#include <linux/spi/tsc2005.h>
73+
74+/**
75+ * The touchscreen interface operates as follows:
76+ *
77+ * Initialize:
78+ * Request access to GPIO103 (DAV)
79+ * tsc2005_ts_irq_handler will trigger when DAV line goes down
80+ *
81+ * 1) Pen is pressed against touchscreeen
82+ * 2) TSC2005 performs AD conversion
83+ * 3) After the conversion is done TSC2005 drives DAV line down
84+ * 4) GPIO IRQ is received and tsc2005_ts_irq_handler is called
85+ * 5) tsc2005_ts_irq_handler queues up an spi transfer to fetch
86+ * the x, y, z1, z2 values
87+ * 6) tsc2005_ts_rx() reports coordinates to input layer and
88+ * sets up tsc2005_ts_timer() to be called after TSC2005_TS_SCAN_TIME
89+ * 7) When the penup_timer expires, there have not been DAV interrupts
90+ * during the last 20ms which means the pen has been lifted.
91+ */
92+
93+#define TSC2005_VDD_LOWER_27
94+
95+#ifdef TSC2005_VDD_LOWER_27
96+#define TSC2005_HZ (10000000)
97+#else
98+#define TSC2005_HZ (25000000)
99+#endif
100+
101+#define TSC2005_CMD (0x80)
102+#define TSC2005_REG (0x00)
103+
104+#define TSC2005_CMD_STOP (1)
105+#define TSC2005_CMD_10BIT (0 << 2)
106+#define TSC2005_CMD_12BIT (1 << 2)
107+
108+#define TSC2005_CMD_SCAN_XYZZ (0 << 3)
109+#define TSC2005_CMD_SCAN_XY (1 << 3)
110+#define TSC2005_CMD_SCAN_X (2 << 3)
111+#define TSC2005_CMD_SCAN_Y (3 << 3)
112+#define TSC2005_CMD_SCAN_ZZ (4 << 3)
113+#define TSC2005_CMD_AUX_SINGLE (5 << 3)
114+#define TSC2005_CMD_TEMP1 (6 << 3)
115+#define TSC2005_CMD_TEMP2 (7 << 3)
116+#define TSC2005_CMD_AUX_CONT (8 << 3)
117+#define TSC2005_CMD_TEST_X_CONN (9 << 3)
118+#define TSC2005_CMD_TEST_Y_CONN (10 << 3)
119+#define TSC2005_CMD_TEST_SHORT (11 << 3)
120+/* command 12 reserved, according to 2008-03 erratum */
121+#define TSC2005_CMD_DRIVE_XX (13 << 3)
122+#define TSC2005_CMD_DRIVE_YY (14 << 3)
123+#define TSC2005_CMD_DRIVE_YX (15 << 3)
124+
125+#define TSC2005_REG_X (0 << 3)
126+#define TSC2005_REG_Y (1 << 3)
127+#define TSC2005_REG_Z1 (2 << 3)
128+#define TSC2005_REG_Z2 (3 << 3)
129+#define TSC2005_REG_AUX (4 << 3)
130+#define TSC2005_REG_TEMP1 (5 << 3)
131+#define TSC2005_REG_TEMP2 (6 << 3)
132+#define TSC2005_REG_STATUS (7 << 3)
133+#define TSC2005_REG_AUX_HIGH (8 << 3)
134+#define TSC2005_REG_AUX_LOW (9 << 3)
135+#define TSC2005_REG_TEMP_HIGH (10 << 3)
136+#define TSC2005_REG_TEMP_LOW (11 << 3)
137+#define TSC2005_REG_CFR0 (12 << 3)
138+#define TSC2005_REG_CFR1 (13 << 3)
139+#define TSC2005_REG_CFR2 (14 << 3)
140+#define TSC2005_REG_FUNCTION (15 << 3)
141+
142+#define TSC2005_REG_PND0 (1 << 1)
143+#define TSC2005_REG_READ (0x01)
144+#define TSC2005_REG_WRITE (0x00)
145+
146+
147+#define TSC2005_CFR0_LONGSAMPLING (1)
148+#define TSC2005_CFR0_DETECTINWAIT (1 << 1)
149+#define TSC2005_CFR0_SENSETIME_32US (0)
150+#define TSC2005_CFR0_SENSETIME_96US (1 << 2)
151+#define TSC2005_CFR0_SENSETIME_544US (1 << 3)
152+#define TSC2005_CFR0_SENSETIME_2080US (1 << 4)
153+#define TSC2005_CFR0_SENSETIME_2656US (0x001C)
154+#define TSC2005_CFR0_PRECHARGE_20US (0x0000)
155+#define TSC2005_CFR0_PRECHARGE_84US (0x0020)
156+#define TSC2005_CFR0_PRECHARGE_276US (0x0040)
157+#define TSC2005_CFR0_PRECHARGE_1044US (0x0080)
158+#define TSC2005_CFR0_PRECHARGE_1364US (0x00E0)
159+#define TSC2005_CFR0_STABTIME_0US (0x0000)
160+#define TSC2005_CFR0_STABTIME_100US (0x0100)
161+#define TSC2005_CFR0_STABTIME_500US (0x0200)
162+#define TSC2005_CFR0_STABTIME_1MS (0x0300)
163+#define TSC2005_CFR0_STABTIME_5MS (0x0400)
164+#define TSC2005_CFR0_STABTIME_100MS (0x0700)
165+#define TSC2005_CFR0_CLOCK_4MHZ (0x0000)
166+#define TSC2005_CFR0_CLOCK_2MHZ (0x0800)
167+#define TSC2005_CFR0_CLOCK_1MHZ (0x1000)
168+#define TSC2005_CFR0_RESOLUTION12 (0x2000)
169+#define TSC2005_CFR0_STATUS (0x4000)
170+#define TSC2005_CFR0_PENMODE (0x8000)
171+
172+#define TSC2005_CFR0_INITVALUE (TSC2005_CFR0_STABTIME_1MS | \
173+ TSC2005_CFR0_CLOCK_1MHZ | \
174+ TSC2005_CFR0_RESOLUTION12 | \
175+ TSC2005_CFR0_PRECHARGE_276US | \
176+ TSC2005_CFR0_PENMODE)
177+
178+/* Bits common to both read and write of config register 0 */
179+#define TSC2005_CFR0_RW_MASK 0x3fff
180+
181+#define TSC2005_CFR1_BATCHDELAY_0MS (0x0000)
182+#define TSC2005_CFR1_BATCHDELAY_1MS (0x0001)
183+#define TSC2005_CFR1_BATCHDELAY_2MS (0x0002)
184+#define TSC2005_CFR1_BATCHDELAY_4MS (0x0003)
185+#define TSC2005_CFR1_BATCHDELAY_10MS (0x0004)
186+#define TSC2005_CFR1_BATCHDELAY_20MS (0x0005)
187+#define TSC2005_CFR1_BATCHDELAY_40MS (0x0006)
188+#define TSC2005_CFR1_BATCHDELAY_100MS (0x0007)
189+
190+#define TSC2005_CFR1_INITVALUE (TSC2005_CFR1_BATCHDELAY_4MS)
191+
192+#define TSC2005_CFR2_MAVE_TEMP (0x0001)
193+#define TSC2005_CFR2_MAVE_AUX (0x0002)
194+#define TSC2005_CFR2_MAVE_Z (0x0004)
195+#define TSC2005_CFR2_MAVE_Y (0x0008)
196+#define TSC2005_CFR2_MAVE_X (0x0010)
197+#define TSC2005_CFR2_AVG_1 (0x0000)
198+#define TSC2005_CFR2_AVG_3 (0x0400)
199+#define TSC2005_CFR2_AVG_7 (0x0800)
200+#define TSC2005_CFR2_MEDIUM_1 (0x0000)
201+#define TSC2005_CFR2_MEDIUM_3 (0x1000)
202+#define TSC2005_CFR2_MEDIUM_7 (0x2000)
203+#define TSC2005_CFR2_MEDIUM_15 (0x3000)
204+
205+#define TSC2005_CFR2_IRQ_MASK (0xC000)
206+#define TSC2005_CFR2_IRQ_DAV (0x4000)
207+#define TSC2005_CFR2_IRQ_PEN (0x8000)
208+#define TSC2005_CFR2_IRQ_PENDAV (0x0000)
209+
210+#define TSC2005_CFR2_INITVALUE (TSC2005_CFR2_IRQ_PENDAV | \
211+ TSC2005_CFR2_MAVE_X | \
212+ TSC2005_CFR2_MAVE_Y | \
213+ TSC2005_CFR2_MAVE_Z | \
214+ TSC2005_CFR2_MEDIUM_15 | \
215+ TSC2005_CFR2_AVG_7)
216+
217+#define MAX_12BIT ((1 << 12) - 1)
218+#define TS_SAMPLES 4
219+#define TSC2005_TS_PENUP_TIME 40
220+
221+static const u32 tsc2005_read_reg[] = {
222+ (TSC2005_REG | TSC2005_REG_X | TSC2005_REG_READ) << 16,
223+ (TSC2005_REG | TSC2005_REG_Y | TSC2005_REG_READ) << 16,
224+ (TSC2005_REG | TSC2005_REG_Z1 | TSC2005_REG_READ) << 16,
225+ (TSC2005_REG | TSC2005_REG_Z2 | TSC2005_REG_READ) << 16,
226+};
227+#define NUM_READ_REGS (sizeof(tsc2005_read_reg)/sizeof(tsc2005_read_reg[0]))
228+
229+struct tsc2005 {
230+ struct spi_device *spi;
231+
232+ struct input_dev *idev;
233+ char phys[32];
234+ struct timer_list penup_timer;
235+
236+ /* ESD recovery via a hardware reset if the tsc2005
237+ * doesn't respond after a configurable period (in ms) of
238+ * IRQ/SPI inactivity. If esd_timeout is 0, timer and work
239+ * fields are used.
240+ */
241+ u32 esd_timeout;
242+ struct timer_list esd_timer;
243+ struct work_struct esd_work;
244+
245+ spinlock_t lock;
246+ struct mutex mutex;
247+
248+ struct spi_message read_msg;
249+ struct spi_transfer read_xfer[NUM_READ_REGS];
250+ u32 data[NUM_READ_REGS];
251+
252+ /* previously reported x,y,p (if pen_down) */
253+ int out_x;
254+ int out_y;
255+ int out_p;
256+ /* fudge parameters - changes must exceed one of these. */
257+ int fudge_x;
258+ int fudge_y;
259+ int fudge_p;
260+ /* raw copy of previous x,y,z */
261+ int in_x;
262+ int in_y;
263+ int in_z1;
264+ int in_z2;
265+ /* average accumulators for each component */
266+ int sample_cnt;
267+ int avg_x;
268+ int avg_y;
269+ int avg_z1;
270+ int avg_z2;
271+ /* configuration */
272+ int x_plate_ohm;
273+ int hw_avg_max;
274+ int stab_time;
275+ int p_max;
276+ int touch_pressure;
277+ /* status */
278+ u8 sample_sent;
279+ u8 pen_down;
280+ u8 disabled;
281+ u8 disable_depth;
282+ u8 spi_pending;
283+
284+ void (*set_reset)(bool enable);
285+};
286+
287+static void tsc2005_cmd(struct tsc2005 *ts, u8 cmd)
288+{
289+ u8 data = TSC2005_CMD | TSC2005_CMD_12BIT | cmd;
290+ struct spi_message msg;
291+ struct spi_transfer xfer = { 0 };
292+
293+ xfer.tx_buf = &data;
294+ xfer.rx_buf = NULL;
295+ xfer.len = 1;
296+ xfer.bits_per_word = 8;
297+
298+ spi_message_init(&msg);
299+ spi_message_add_tail(&xfer, &msg);
300+ spi_sync(ts->spi, &msg);
301+}
302+
303+static void tsc2005_write(struct tsc2005 *ts, u8 reg, u16 value)
304+{
305+ u32 tx;
306+ struct spi_message msg;
307+ struct spi_transfer xfer = { 0 };
308+
309+ tx = (TSC2005_REG | reg | TSC2005_REG_PND0 |
310+ TSC2005_REG_WRITE) << 16;
311+ tx |= value;
312+
313+ xfer.tx_buf = &tx;
314+ xfer.rx_buf = NULL;
315+ xfer.len = 4;
316+ xfer.bits_per_word = 24;
317+
318+ spi_message_init(&msg);
319+ spi_message_add_tail(&xfer, &msg);
320+ spi_sync(ts->spi, &msg);
321+}
322+
323+static void tsc2005_read(struct tsc2005 *ts, u8 reg, u16 *value)
324+{
325+ u32 tx;
326+ u32 rx = 0;
327+ struct spi_message msg;
328+ struct spi_transfer xfer = { 0 };
329+
330+ tx = (TSC2005_REG | reg | TSC2005_REG_READ) << 16;
331+
332+ xfer.tx_buf = &tx;
333+ xfer.rx_buf = &rx;
334+ xfer.len = 4;
335+ xfer.bits_per_word = 24;
336+
337+ spi_message_init(&msg);
338+ spi_message_add_tail(&xfer, &msg);
339+ spi_sync(ts->spi, &msg);
340+ *value = rx;
341+}
342+
343+static void tsc2005_ts_update_pen_state(struct tsc2005 *ts,
344+ int x, int y, int pressure)
345+{
346+ if (pressure) {
347+ input_report_abs(ts->idev, ABS_X, x);
348+ input_report_abs(ts->idev, ABS_Y, y);
349+ input_report_abs(ts->idev, ABS_PRESSURE, pressure);
350+ if (!ts->pen_down) {
351+ input_report_key(ts->idev, BTN_TOUCH, 1);
352+ ts->pen_down = 1;
353+ }
354+ } else {
355+ input_report_abs(ts->idev, ABS_PRESSURE, 0);
356+ if (ts->pen_down) {
357+ input_report_key(ts->idev, BTN_TOUCH, 0);
358+ ts->pen_down = 0;
359+ }
360+ }
361+
362+ input_sync(ts->idev);
363+}
364+
365+/*
366+ * This function is called by the SPI framework after the coordinates
367+ * have been read from TSC2005
368+ */
369+static void tsc2005_ts_rx(void *arg)
370+{
371+ struct tsc2005 *ts = arg;
372+ unsigned long flags;
373+ int inside_rect, pressure_limit;
374+ int x, y, z1, z2, pressure;
375+
376+ spin_lock_irqsave(&ts->lock, flags);
377+
378+ if (ts->disable_depth) {
379+ ts->spi_pending = 0;
380+ goto out;
381+ }
382+
383+ x = ts->data[0];
384+ y = ts->data[1];
385+ z1 = ts->data[2];
386+ z2 = ts->data[3];
387+
388+ /* validate pressure and position */
389+ if (x > MAX_12BIT || y > MAX_12BIT)
390+ goto out;
391+
392+ /* skip coords if the pressure-components are out of range */
393+ if (z1 < 100 || z2 > MAX_12BIT || z1 >= z2)
394+ goto out;
395+
396+ /* skip point if this is a pen down with the exact same values as
397+ * the value before pen-up - that implies SPI fed us stale data
398+ */
399+ if (!ts->pen_down &&
400+ ts->in_x == x &&
401+ ts->in_y == y &&
402+ ts->in_z1 == z1 &&
403+ ts->in_z2 == z2)
404+ goto out;
405+
406+ /* At this point we are happy we have a valid and useful reading.
407+ * Remember it for later comparisons. We may now begin downsampling
408+ */
409+ ts->in_x = x;
410+ ts->in_y = y;
411+ ts->in_z1 = z1;
412+ ts->in_z2 = z2;
413+
414+ /* don't run average on the "pen down" event */
415+ if (ts->sample_sent) {
416+ ts->avg_x += x;
417+ ts->avg_y += y;
418+ ts->avg_z1 += z1;
419+ ts->avg_z2 += z2;
420+
421+ if (++ts->sample_cnt < TS_SAMPLES)
422+ goto out;
423+
424+ x = ts->avg_x / TS_SAMPLES;
425+ y = ts->avg_y / TS_SAMPLES;
426+ z1 = ts->avg_z1 / TS_SAMPLES;
427+ z2 = ts->avg_z2 / TS_SAMPLES;
428+ }
429+
430+ ts->sample_cnt = 0;
431+ ts->avg_x = 0;
432+ ts->avg_y = 0;
433+ ts->avg_z1 = 0;
434+ ts->avg_z2 = 0;
435+
436+ pressure = x * (z2 - z1) / z1;
437+ pressure = pressure * ts->x_plate_ohm / 4096;
438+
439+ pressure_limit = ts->sample_sent ? ts->p_max : ts->touch_pressure;
440+ if (pressure > pressure_limit)
441+ goto out;
442+
443+ /* Discard the event if it still is within the previous rect -
444+ * unless the pressure is clearly harder, but then use previous
445+ * x,y position. If any coordinate deviates enough, fudging
446+ * of all three will still take place in the input layer.
447+ */
448+ inside_rect = (ts->sample_sent &&
449+ x > (int)ts->out_x - ts->fudge_x &&
450+ x < (int)ts->out_x + ts->fudge_x &&
451+ y > (int)ts->out_y - ts->fudge_y &&
452+ y < (int)ts->out_y + ts->fudge_y);
453+ if (inside_rect)
454+ x = ts->out_x, y = ts->out_y;
455+
456+ if (!inside_rect || pressure < (ts->out_p - ts->fudge_p)) {
457+ tsc2005_ts_update_pen_state(ts, x, y, pressure);
458+ ts->sample_sent = 1;
459+ ts->out_x = x;
460+ ts->out_y = y;
461+ ts->out_p = pressure;
462+ }
463+out:
464+ if (ts->spi_pending > 1) {
465+ /* One or more interrupts (sometimes several dozens)
466+ * occured while waiting for the SPI read - get
467+ * another read going.
468+ */
469+ ts->spi_pending = 1;
470+ if (spi_async(ts->spi, &ts->read_msg)) {
471+ dev_err(&ts->spi->dev, "ts: spi_async() failed");
472+ ts->spi_pending = 0;
473+ }
474+ } else
475+ ts->spi_pending = 0;
476+
477+ /* kick pen up timer - to make sure it expires again(!) */
478+ if (ts->sample_sent) {
479+ mod_timer(&ts->penup_timer,
480+ jiffies + msecs_to_jiffies(TSC2005_TS_PENUP_TIME));
481+ /* Also kick the watchdog, as we still think we're alive */
482+ if (ts->esd_timeout && ts->disable_depth == 0) {
483+ unsigned long wdj = msecs_to_jiffies(ts->esd_timeout);
484+ mod_timer(&ts->esd_timer, round_jiffies(jiffies+wdj));
485+ }
486+ }
487+ spin_unlock_irqrestore(&ts->lock, flags);
488+}
489+
490+/* This penup timer is very forgiving of delayed SPI reads. The
491+ * (ESD) watchdog will rescue us if spi_pending remains set, unless
492+ * we are enterring the disabled state. In that case we must just
493+ * handle the pen up, and let disabling complete.
494+ */
495+static void tsc2005_ts_penup_timer_handler(unsigned long data)
496+{
497+ struct tsc2005 *ts = (struct tsc2005 *)data;
498+ if ((!ts->spi_pending || ts->disable_depth) &&
499+ ts->sample_sent) {
500+ tsc2005_ts_update_pen_state(ts, 0, 0, 0);
501+ ts->sample_sent = 0;
502+ }
503+}
504+
505+/*
506+ * This interrupt is called when pen is down and coordinates are
507+ * available. That is indicated by a either:
508+ * a) a rising edge on PINTDAV or (PENDAV mode)
509+ * b) a falling edge on DAV line (DAV mode)
510+ * depending on the setting of the IRQ bits in the CFR2 setting above.
511+ */
512+static irqreturn_t tsc2005_ts_irq_handler(int irq, void *dev_id)
513+{
514+ struct tsc2005 *ts = dev_id;
515+ if (ts->disable_depth)
516+ goto out;
517+
518+ if (!ts->spi_pending) {
519+ if (spi_async(ts->spi, &ts->read_msg)) {
520+ dev_err(&ts->spi->dev, "ts: spi_async() failed");
521+ goto out;
522+ }
523+ }
524+ /* By shifting in 1s we can never wrap */
525+ ts->spi_pending = (ts->spi_pending<<1)+1;
526+
527+ /* Kick pen up timer only if it's not been started yet. Strictly,
528+ * it isn't even necessary to start it at all here, but doing so
529+ * keeps an equivalence between pen state and timer state.
530+ * The SPI read loop will keep pushing it into the future.
531+ * If it times out with an SPI pending, it's ignored anyway.
532+ */
533+ if (!timer_pending(&ts->penup_timer)) {
534+ unsigned long pu = msecs_to_jiffies(TSC2005_TS_PENUP_TIME);
535+ ts->penup_timer.expires = jiffies + pu;
536+ add_timer(&ts->penup_timer);
537+ }
538+out:
539+ return IRQ_HANDLED;
540+}
541+
542+static void tsc2005_ts_setup_spi_xfer(struct tsc2005 *ts)
543+{
544+ struct spi_message *m = &ts->read_msg;
545+ struct spi_transfer *x = &ts->read_xfer[0];
546+ int i;
547+
548+ spi_message_init(m);
549+
550+ for (i = 0; i < NUM_READ_REGS; i++, x++) {
551+ x->tx_buf = &tsc2005_read_reg[i];
552+ x->rx_buf = &ts->data[i];
553+ x->len = 4;
554+ x->bits_per_word = 24;
555+ x->cs_change = i < (NUM_READ_REGS - 1);
556+ spi_message_add_tail(x, m);
557+ }
558+
559+ m->complete = tsc2005_ts_rx;
560+ m->context = ts;
561+}
562+
563+static ssize_t tsc2005_ts_pen_down_show(struct device *dev,
564+ struct device_attribute *attr,
565+ char *buf)
566+{
567+ struct tsc2005 *ts = dev_get_drvdata(dev);
568+
569+ return sprintf(buf, "%u\n", ts->pen_down);
570+}
571+
572+static DEVICE_ATTR(pen_down, S_IRUGO, tsc2005_ts_pen_down_show, NULL);
573+
574+static int tsc2005_configure(struct tsc2005 *ts, int flags)
575+{
576+ tsc2005_write(ts, TSC2005_REG_CFR0, TSC2005_CFR0_INITVALUE);
577+ tsc2005_write(ts, TSC2005_REG_CFR1, TSC2005_CFR1_INITVALUE);
578+ tsc2005_write(ts, TSC2005_REG_CFR2, TSC2005_CFR2_INITVALUE);
579+ tsc2005_cmd(ts, flags);
580+
581+ return 0;
582+}
583+
584+static void tsc2005_start_scan(struct tsc2005 *ts)
585+{
586+ tsc2005_configure(ts, TSC2005_CMD_SCAN_XYZZ);
587+}
588+
589+static void tsc2005_stop_scan(struct tsc2005 *ts)
590+{
591+ tsc2005_cmd(ts, TSC2005_CMD_STOP);
592+}
593+
594+/* Must be called with mutex held */
595+static void tsc2005_disable(struct tsc2005 *ts)
596+{
597+ if (ts->disable_depth++ != 0)
598+ return;
599+
600+ disable_irq(ts->spi->irq);
601+ if (ts->esd_timeout)
602+ del_timer(&ts->esd_timer);
603+
604+ /* wait until penup timer expire normally */
605+ do {
606+ msleep(4);
607+ } while (ts->sample_sent);
608+
609+ tsc2005_stop_scan(ts);
610+}
611+
612+static void tsc2005_enable(struct tsc2005 *ts)
613+{
614+ if (ts->disable_depth != 1)
615+ goto out;
616+
617+ if (ts->esd_timeout) {
618+ unsigned long wdj = msecs_to_jiffies(ts->esd_timeout);
619+ ts->esd_timer.expires = round_jiffies(jiffies+wdj);
620+ add_timer(&ts->esd_timer);
621+ }
622+ tsc2005_start_scan(ts);
623+ enable_irq(ts->spi->irq);
624+out:
625+ --ts->disable_depth;
626+}
627+
628+static ssize_t tsc2005_disable_show(struct device *dev,
629+ struct device_attribute *attr, char *buf)
630+{
631+ struct tsc2005 *ts = dev_get_drvdata(dev);
632+
633+ return sprintf(buf, "%u\n", ts->disabled);
634+}
635+
636+static ssize_t tsc2005_disable_store(struct device *dev,
637+ struct device_attribute *attr,
638+ const char *buf, size_t count)
639+{
640+ struct tsc2005 *ts = dev_get_drvdata(dev);
641+ unsigned long res;
642+ int i;
643+
644+ if (strict_strtoul(buf, 10, &res) < 0)
645+ return -EINVAL;
646+ i = res ? 1 : 0;
647+
648+ mutex_lock(&ts->mutex);
649+ if (i == ts->disabled)
650+ goto out;
651+ ts->disabled = i;
652+
653+ if (i)
654+ tsc2005_disable(ts);
655+ else
656+ tsc2005_enable(ts);
657+out:
658+ mutex_unlock(&ts->mutex);
659+ return count;
660+}
661+
662+static DEVICE_ATTR(disable_ts, 0664, tsc2005_disable_show,
663+ tsc2005_disable_store);
664+
665+static ssize_t tsc2005_ctrl_selftest_show(struct device *dev,
666+ struct device_attribute *attr,
667+ char *buf)
668+{
669+ u16 temp_high_orig, temp_high_test, temp_high;
670+ unsigned int result = 1;
671+ struct tsc2005 *ts = dev_get_drvdata(dev);
672+
673+ if (!ts->set_reset) {
674+ dev_warn(&ts->spi->dev,
675+ "unable to selftest: reset not configured\n");
676+ result = 0;
677+ goto out;
678+ }
679+
680+ mutex_lock(&ts->mutex);
681+ tsc2005_disable(ts);
682+
683+ /* Test ctrl communications via temp high / low registers */
684+ tsc2005_read(ts, TSC2005_REG_TEMP_HIGH, &temp_high_orig);
685+
686+ temp_high_test = (temp_high_orig - 1) & 0x0FFF;
687+
688+ tsc2005_write(ts, TSC2005_REG_TEMP_HIGH, temp_high_test);
689+
690+ tsc2005_read(ts, TSC2005_REG_TEMP_HIGH, &temp_high);
691+
692+ if (temp_high != temp_high_test) {
693+ result = 0;
694+ dev_warn(dev, "selftest failed: %d != %d\n",
695+ temp_high, temp_high_test);
696+ }
697+
698+ /* HW Reset */
699+ ts->set_reset(0);
700+ msleep(1); /* only 10us required */
701+ ts->set_reset(1);
702+
703+ tsc2005_enable(ts);
704+
705+ /* Test that reset really happened */
706+ tsc2005_read(ts, TSC2005_REG_TEMP_HIGH, &temp_high);
707+
708+ if (temp_high != temp_high_orig) {
709+ result = 0;
710+ dev_warn(dev, "selftest failed after reset: "
711+ "%d != %d\n",
712+ temp_high, temp_high_orig);
713+ }
714+
715+ mutex_unlock(&ts->mutex);
716+
717+out:
718+ return sprintf(buf, "%u\n", result);
719+}
720+
721+static DEVICE_ATTR(ts_ctrl_selftest, S_IRUGO, tsc2005_ctrl_selftest_show, NULL);
722+
723+static void tsc2005_esd_timer_handler(unsigned long data)
724+{
725+ struct tsc2005 *ts = (struct tsc2005 *)data;
726+ if (!ts->disable_depth)
727+ schedule_work(&ts->esd_work);
728+}
729+
730+static void tsc2005_rst_handler(struct work_struct *work)
731+{
732+ u16 reg_val;
733+ struct tsc2005 *ts = container_of(work, struct tsc2005, esd_work);
734+ unsigned long wdj;
735+
736+ mutex_lock(&ts->mutex);
737+
738+ /* If we are disabled, or the a touch has been detected,
739+ * then ignore this timeout. The enable will restart the
740+ * watchdog, as it restarts scanning
741+ */
742+ if (ts->disable_depth)
743+ goto out;
744+
745+ /* If we cannot read our known value from configuration register 0
746+ * then reset the controller as if from power-up and start
747+ * scanning again. Always re-arm the watchdog.
748+ */
749+ tsc2005_read(ts, TSC2005_REG_CFR0, &reg_val);
750+ if ((reg_val ^ TSC2005_CFR0_INITVALUE) & TSC2005_CFR0_RW_MASK) {
751+ dev_info(&ts->spi->dev, "TSC not responding, resetting.\n");
752+ /* If this timer kicked in, the penup timer, if ever active
753+ * at all, must have expired ages ago, so no need to del it.
754+ */
755+ ts->set_reset(0);
756+ if (ts->sample_sent) {
757+ tsc2005_ts_update_pen_state(ts, 0, 0, 0);
758+ ts->sample_sent = 0;
759+ }
760+ ts->spi_pending = 0;
761+ msleep(1); /* only 10us required */
762+ ts->set_reset(1);
763+ tsc2005_start_scan(ts);
764+ }
765+ wdj = msecs_to_jiffies(ts->esd_timeout);
766+ mod_timer(&ts->esd_timer, round_jiffies(jiffies+wdj));
767+
768+out:
769+ mutex_unlock(&ts->mutex);
770+}
771+
772+static int __devinit tsc2005_ts_init(struct tsc2005 *ts,
773+ struct tsc2005_platform_data *pdata)
774+{
775+ struct input_dev *idev;
776+ int r;
777+ int x_max, y_max;
778+
779+ init_timer(&ts->penup_timer);
780+ setup_timer(&ts->penup_timer, tsc2005_ts_penup_timer_handler,
781+ (unsigned long)ts);
782+
783+ spin_lock_init(&ts->lock);
784+ mutex_init(&ts->mutex);
785+
786+ ts->x_plate_ohm = pdata->ts_x_plate_ohm ? : 280;
787+ ts->hw_avg_max = pdata->ts_hw_avg;
788+ ts->stab_time = pdata->ts_stab_time;
789+ x_max = pdata->ts_x_max ? : 4096;
790+ ts->fudge_x = pdata->ts_x_fudge ? : 4;
791+ y_max = pdata->ts_y_max ? : 4096;
792+ ts->fudge_y = pdata->ts_y_fudge ? : 8;
793+ ts->p_max = pdata->ts_pressure_max ? : MAX_12BIT;
794+ ts->touch_pressure = pdata->ts_touch_pressure ? : ts->p_max;
795+ ts->fudge_p = pdata->ts_pressure_fudge ? : 2;
796+
797+ ts->set_reset = pdata->set_reset;
798+
799+ idev = input_allocate_device();
800+ if (idev == NULL) {
801+ r = -ENOMEM;
802+ goto err1;
803+ }
804+
805+ idev->name = "TSC2005 touchscreen";
806+ snprintf(ts->phys, sizeof(ts->phys), "%s/input-ts",
807+ dev_name(&ts->spi->dev));
808+ idev->phys = ts->phys;
809+
810+ idev->evbit[0] = BIT(EV_ABS) | BIT(EV_KEY);
811+ idev->absbit[0] = BIT(ABS_X) | BIT(ABS_Y) | BIT(ABS_PRESSURE);
812+ idev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
813+ ts->idev = idev;
814+
815+ tsc2005_ts_setup_spi_xfer(ts);
816+
817+ input_set_abs_params(idev, ABS_X, 0, x_max, ts->fudge_x, 0);
818+ input_set_abs_params(idev, ABS_Y, 0, y_max, ts->fudge_y, 0);
819+ input_set_abs_params(idev, ABS_PRESSURE, 0, ts->p_max, ts->fudge_p, 0);
820+
821+ tsc2005_start_scan(ts);
822+
823+ r = request_irq(ts->spi->irq, tsc2005_ts_irq_handler,
824+ (((TSC2005_CFR2_INITVALUE & TSC2005_CFR2_IRQ_MASK) ==
825+ TSC2005_CFR2_IRQ_PENDAV)
826+ ? IRQF_TRIGGER_RISING
827+ : IRQF_TRIGGER_FALLING) |
828+ IRQF_DISABLED, "tsc2005", ts);
829+ if (r < 0) {
830+ dev_err(&ts->spi->dev, "unable to get DAV IRQ");
831+ goto err2;
832+ }
833+
834+ set_irq_wake(ts->spi->irq, 1);
835+
836+ r = input_register_device(idev);
837+ if (r < 0) {
838+ dev_err(&ts->spi->dev, "can't register touchscreen device\n");
839+ goto err3;
840+ }
841+
842+ /* We can tolerate these failing */
843+ r = device_create_file(&ts->spi->dev, &dev_attr_ts_ctrl_selftest);
844+ if (r < 0)
845+ dev_warn(&ts->spi->dev, "can't create sysfs file for %s: %d\n",
846+ dev_attr_ts_ctrl_selftest.attr.name, r);
847+
848+ r = device_create_file(&ts->spi->dev, &dev_attr_pen_down);
849+ if (r < 0)
850+ dev_warn(&ts->spi->dev, "can't create sysfs file for %s: %d\n",
851+ dev_attr_pen_down.attr.name, r);
852+
853+ r = device_create_file(&ts->spi->dev, &dev_attr_disable_ts);
854+ if (r < 0)
855+ dev_warn(&ts->spi->dev, "can't create sysfs file for %s: %d\n",
856+ dev_attr_disable_ts.attr.name, r);
857+
858+ /* Finally, configure and start the optional EDD watchdog. */
859+ ts->esd_timeout = pdata->esd_timeout;
860+ if (ts->esd_timeout && ts->set_reset) {
861+ unsigned long wdj;
862+ setup_timer(&ts->esd_timer, tsc2005_esd_timer_handler,
863+ (unsigned long)ts);
864+ INIT_WORK(&ts->esd_work, tsc2005_rst_handler);
865+ wdj = msecs_to_jiffies(ts->esd_timeout);
866+ ts->esd_timer.expires = round_jiffies(jiffies+wdj);
867+ add_timer(&ts->esd_timer);
868+ }
869+
870+ return 0;
871+err3:
872+ free_irq(ts->spi->irq, ts);
873+err2:
874+ tsc2005_stop_scan(ts);
875+ input_free_device(idev);
876+err1:
877+ return r;
878+}
879+
880+static int __devinit tsc2005_probe(struct spi_device *spi)
881+{
882+ struct tsc2005 *ts;
883+ struct tsc2005_platform_data *pdata = spi->dev.platform_data;
884+ int r;
885+
886+ if (spi->irq < 0) {
887+ dev_dbg(&spi->dev, "no irq?\n");
888+ return -ENODEV;
889+ }
890+ if (!pdata) {
891+ dev_dbg(&spi->dev, "no platform data?\n");
892+ return -ENODEV;
893+ }
894+
895+ ts = kzalloc(sizeof(*ts), GFP_KERNEL);
896+ if (ts == NULL)
897+ return -ENOMEM;
898+
899+ dev_set_drvdata(&spi->dev, ts);
900+ ts->spi = spi;
901+ spi->dev.power.power_state = PMSG_ON;
902+
903+ spi->mode = SPI_MODE_0;
904+ spi->bits_per_word = 8;
905+ /* The max speed might've been defined by the board-specific
906+ * struct */
907+ if (!spi->max_speed_hz)
908+ spi->max_speed_hz = TSC2005_HZ;
909+
910+ spi_setup(spi);
911+
912+ r = tsc2005_ts_init(ts, pdata);
913+ if (r)
914+ goto err1;
915+
916+ return 0;
917+
918+err1:
919+ kfree(ts);
920+ return r;
921+}
922+
923+static int __devexit tsc2005_remove(struct spi_device *spi)
924+{
925+ struct tsc2005 *ts = dev_get_drvdata(&spi->dev);
926+
927+ mutex_lock(&ts->mutex);
928+ tsc2005_disable(ts);
929+ mutex_unlock(&ts->mutex);
930+
931+ device_remove_file(&ts->spi->dev, &dev_attr_disable_ts);
932+ device_remove_file(&ts->spi->dev, &dev_attr_pen_down);
933+ device_remove_file(&ts->spi->dev, &dev_attr_ts_ctrl_selftest);
934+
935+ free_irq(ts->spi->irq, ts);
936+ input_unregister_device(ts->idev);
937+
938+ if (ts->esd_timeout)
939+ del_timer(&ts->esd_timer);
940+ kfree(ts);
941+
942+ return 0;
943+}
944+
945+#ifdef CONFIG_PM
946+static int tsc2005_suspend(struct spi_device *spi, pm_message_t mesg)
947+{
948+ struct tsc2005 *ts = dev_get_drvdata(&spi->dev);
949+
950+ mutex_lock(&ts->mutex);
951+ tsc2005_disable(ts);
952+ mutex_unlock(&ts->mutex);
953+
954+ return 0;
955+}
956+
957+static int tsc2005_resume(struct spi_device *spi)
958+{
959+ struct tsc2005 *ts = dev_get_drvdata(&spi->dev);
960+
961+ mutex_lock(&ts->mutex);
962+ tsc2005_enable(ts);
963+ mutex_unlock(&ts->mutex);
964+
965+ return 0;
966+}
967+#endif
968+
969+static struct spi_driver tsc2005_driver = {
970+ .driver = {
971+ .name = "tsc2005",
972+ .owner = THIS_MODULE,
973+ },
974+#ifdef CONFIG_PM
975+ .suspend = tsc2005_suspend,
976+ .resume = tsc2005_resume,
977+#endif
978+ .probe = tsc2005_probe,
979+ .remove = __devexit_p(tsc2005_remove),
980+};
981+
982+static int __init tsc2005_init(void)
983+{
984+ printk(KERN_INFO "TSC2005 driver initializing\n");
985+
986+ return spi_register_driver(&tsc2005_driver);
987+}
988+module_init(tsc2005_init);
989+
990+static void __exit tsc2005_exit(void)
991+{
992+ spi_unregister_driver(&tsc2005_driver);
993+}
994+module_exit(tsc2005_exit);
995+
996+MODULE_AUTHOR("Lauri Leukkunen <lauri.leukkunen@nokia.com>");
997+MODULE_LICENSE("GPL");
998+MODULE_ALIAS("platform:tsc2005");
999--- /dev/null
1000+++ b/include/linux/spi/tsc2005.h
1001@@ -0,0 +1,30 @@
1002+#ifndef _LINUX_SPI_TSC2005_H
1003+#define _LINUX_SPI_TSC2005_H
1004+
1005+#include <linux/types.h>
1006+
1007+struct tsc2005_platform_data {
1008+ u16 ts_x_plate_ohm;
1009+ u32 ts_stab_time; /* voltage settling time */
1010+ u8 ts_hw_avg; /* HW assiseted averaging. Can be
1011+ 0, 4, 8, 16 samples per reading */
1012+ u32 ts_touch_pressure; /* Pressure limit until we report a
1013+ touch event. After that we switch
1014+ to ts_max_pressure. */
1015+ u32 ts_pressure_max;/* Samples with bigger pressure value will
1016+ be ignored, since the corresponding X, Y
1017+ values are unreliable */
1018+ u32 ts_pressure_fudge;
1019+ u32 ts_x_max;
1020+ u32 ts_x_fudge;
1021+ u32 ts_y_max;
1022+ u32 ts_y_fudge;
1023+
1024+ u32 esd_timeout; /* msec of inactivity before we check */
1025+
1026+ unsigned ts_ignore_last:1;
1027+
1028+ void (*set_reset)(bool enable);
1029+};
1030+
1031+#endif
1032

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