3 * Cypress TrueTouch(TM) Standard Product (TTSP) touchscreen drivers.
4 * For use with Cypress Txx3xx parts.
5 * Supported parts include:
9 * Copyright (C) 2009, 2010, 2011 Cypress Semiconductor, Inc.
10 * Copyright (C) 2012 Javier Martinez Canillas <javier@dowhile0.org>
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * version 2, and only version 2, as published by the
15 * Free Software Foundation.
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
22 * You should have received a copy of the GNU General Public License along
23 * with this program; if not, write to the Free Software Foundation, Inc.,
24 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
26 * Contact Cypress Semiconductor at www.cypress.com <kev@cypress.com>
30 #include <linux/delay.h>
31 #include <linux/input.h>
32 #include <linux/input/mt.h>
33 #include <linux/gpio.h>
34 #include <linux/interrupt.h>
35 #include <linux/slab.h>
37 #include "cyttsp_core.h"
39 /* Bootloader number of command keys */
40 #define CY_NUM_BL_KEYS 8
43 #define GET_NUM_TOUCHES(x) ((x) & 0x0F)
44 #define IS_LARGE_AREA(x) (((x) & 0x10) >> 4)
45 #define IS_BAD_PKT(x) ((x) & 0x20)
46 #define IS_VALID_APP(x) ((x) & 0x01)
47 #define IS_OPERATIONAL_ERR(x) ((x) & 0x3F)
48 #define GET_HSTMODE(reg) (((reg) & 0x70) >> 4)
49 #define GET_BOOTLOADERMODE(reg) (((reg) & 0x10) >> 4)
51 #define CY_REG_BASE 0x00
52 #define CY_REG_ACT_DIST 0x1E
53 #define CY_REG_ACT_INTRVL 0x1D
54 #define CY_REG_TCH_TMOUT (CY_REG_ACT_INTRVL + 1)
55 #define CY_REG_LP_INTRVL (CY_REG_TCH_TMOUT + 1)
57 #define CY_DELAY_DFLT 20 /* ms */
58 #define CY_DELAY_MAX 500
59 #define CY_ACT_DIST_DFLT 0xF8
60 #define CY_HNDSHK_BIT 0x80
61 /* device mode bits */
62 #define CY_OPERATE_MODE 0x00
63 #define CY_SYSINFO_MODE 0x10
64 /* power mode select bits */
65 #define CY_SOFT_RESET_MODE 0x01 /* return to Bootloader mode */
66 #define CY_DEEP_SLEEP_MODE 0x02
67 #define CY_LOW_POWER_MODE 0x04
69 /* Slots management */
70 #define CY_MAX_FINGER 4
73 static const u8 bl_command[] = {
74 0x00, /* file offset */
76 0xA5, /* exit bootloader command */
77 0, 1, 2, 3, 4, 5, 6, 7 /* default keys */
80 static int ttsp_read_block_data(struct cyttsp *ts, u8 command,
86 for (tries = 0; tries < CY_NUM_RETRY; tries++) {
87 error = ts->bus_ops->read(ts, command, length, buf);
91 msleep(CY_DELAY_DFLT);
97 static int ttsp_write_block_data(struct cyttsp *ts, u8 command,
103 for (tries = 0; tries < CY_NUM_RETRY; tries++) {
104 error = ts->bus_ops->write(ts, command, length, buf);
108 msleep(CY_DELAY_DFLT);
114 static int ttsp_send_command(struct cyttsp *ts, u8 cmd)
116 return ttsp_write_block_data(ts, CY_REG_BASE, sizeof(cmd), &cmd);
119 static int cyttsp_handshake(struct cyttsp *ts)
121 if (ts->pdata->use_hndshk)
122 return ttsp_send_command(ts,
123 ts->xy_data.hst_mode ^ CY_HNDSHK_BIT);
128 static int cyttsp_load_bl_regs(struct cyttsp *ts)
130 memset(&ts->bl_data, 0, sizeof(ts->bl_data));
131 ts->bl_data.bl_status = 0x10;
133 return ttsp_read_block_data(ts, CY_REG_BASE,
134 sizeof(ts->bl_data), &ts->bl_data);
137 static int cyttsp_exit_bl_mode(struct cyttsp *ts)
140 u8 bl_cmd[sizeof(bl_command)];
142 memcpy(bl_cmd, bl_command, sizeof(bl_command));
143 if (ts->pdata->bl_keys)
144 memcpy(&bl_cmd[sizeof(bl_command) - CY_NUM_BL_KEYS],
145 ts->pdata->bl_keys, CY_NUM_BL_KEYS);
147 error = ttsp_write_block_data(ts, CY_REG_BASE,
148 sizeof(bl_cmd), bl_cmd);
152 /* wait for TTSP Device to complete the operation */
153 msleep(CY_DELAY_DFLT);
155 error = cyttsp_load_bl_regs(ts);
159 if (GET_BOOTLOADERMODE(ts->bl_data.bl_status))
165 static int cyttsp_set_operational_mode(struct cyttsp *ts)
169 error = ttsp_send_command(ts, CY_OPERATE_MODE);
173 /* wait for TTSP Device to complete switch to Operational mode */
174 error = ttsp_read_block_data(ts, CY_REG_BASE,
175 sizeof(ts->xy_data), &ts->xy_data);
179 error = cyttsp_handshake(ts);
183 return ts->xy_data.act_dist == CY_ACT_DIST_DFLT ? -EIO : 0;
186 static int cyttsp_set_sysinfo_mode(struct cyttsp *ts)
190 memset(&ts->sysinfo_data, 0, sizeof(ts->sysinfo_data));
192 /* switch to sysinfo mode */
193 error = ttsp_send_command(ts, CY_SYSINFO_MODE);
197 /* read sysinfo registers */
198 msleep(CY_DELAY_DFLT);
199 error = ttsp_read_block_data(ts, CY_REG_BASE, sizeof(ts->sysinfo_data),
204 error = cyttsp_handshake(ts);
208 if (!ts->sysinfo_data.tts_verh && !ts->sysinfo_data.tts_verl)
214 static int cyttsp_set_sysinfo_regs(struct cyttsp *ts)
218 if (ts->pdata->act_intrvl != CY_ACT_INTRVL_DFLT ||
219 ts->pdata->tch_tmout != CY_TCH_TMOUT_DFLT ||
220 ts->pdata->lp_intrvl != CY_LP_INTRVL_DFLT) {
223 ts->pdata->act_intrvl,
224 ts->pdata->tch_tmout,
228 /* set intrvl registers */
229 retval = ttsp_write_block_data(ts, CY_REG_ACT_INTRVL,
230 sizeof(intrvl_ray), intrvl_ray);
231 msleep(CY_DELAY_DFLT);
237 static int cyttsp_soft_reset(struct cyttsp *ts)
239 unsigned long timeout;
242 /* wait for interrupt to set ready completion */
243 INIT_COMPLETION(ts->bl_ready);
244 ts->state = CY_BL_STATE;
248 retval = ttsp_send_command(ts, CY_SOFT_RESET_MODE);
252 timeout = wait_for_completion_timeout(&ts->bl_ready,
253 msecs_to_jiffies(CY_DELAY_DFLT * CY_DELAY_MAX));
254 retval = timeout ? 0 : -EIO;
257 ts->state = CY_IDLE_STATE;
258 disable_irq(ts->irq);
262 static int cyttsp_act_dist_setup(struct cyttsp *ts)
264 u8 act_dist_setup = ts->pdata->act_dist;
266 /* Init gesture; active distance setup */
267 return ttsp_write_block_data(ts, CY_REG_ACT_DIST,
268 sizeof(act_dist_setup), &act_dist_setup);
271 static void cyttsp_extract_track_ids(struct cyttsp_xydata *xy_data, int *ids)
273 ids[0] = xy_data->touch12_id >> 4;
274 ids[1] = xy_data->touch12_id & 0xF;
275 ids[2] = xy_data->touch34_id >> 4;
276 ids[3] = xy_data->touch34_id & 0xF;
279 static const struct cyttsp_tch *cyttsp_get_tch(struct cyttsp_xydata *xy_data,
284 return &xy_data->tch1;
286 return &xy_data->tch2;
288 return &xy_data->tch3;
290 return &xy_data->tch4;
296 static void cyttsp_report_tchdata(struct cyttsp *ts)
298 struct cyttsp_xydata *xy_data = &ts->xy_data;
299 struct input_dev *input = ts->input;
300 int num_tch = GET_NUM_TOUCHES(xy_data->tt_stat);
301 const struct cyttsp_tch *tch;
304 DECLARE_BITMAP(used, CY_MAX_ID);
306 if (IS_LARGE_AREA(xy_data->tt_stat) == 1) {
307 /* terminate all active tracks */
309 dev_dbg(ts->dev, "%s: Large area detected\n", __func__);
310 } else if (num_tch > CY_MAX_FINGER) {
311 /* terminate all active tracks */
313 dev_dbg(ts->dev, "%s: Num touch error detected\n", __func__);
314 } else if (IS_BAD_PKT(xy_data->tt_mode)) {
315 /* terminate all active tracks */
317 dev_dbg(ts->dev, "%s: Invalid buffer detected\n", __func__);
320 cyttsp_extract_track_ids(xy_data, ids);
322 bitmap_zero(used, CY_MAX_ID);
324 for (i = 0; i < num_tch; i++) {
325 tch = cyttsp_get_tch(xy_data, i);
327 input_mt_slot(input, ids[i]);
328 input_mt_report_slot_state(input, MT_TOOL_FINGER, true);
329 input_report_abs(input, ABS_MT_POSITION_X, be16_to_cpu(tch->x));
330 input_report_abs(input, ABS_MT_POSITION_Y, be16_to_cpu(tch->y));
331 input_report_abs(input, ABS_MT_TOUCH_MAJOR, tch->z);
333 __set_bit(ids[i], used);
336 for (i = 0; i < CY_MAX_ID; i++) {
337 if (test_bit(i, used))
340 input_mt_slot(input, i);
341 input_mt_report_slot_state(input, MT_TOOL_FINGER, false);
347 static irqreturn_t cyttsp_irq(int irq, void *handle)
349 struct cyttsp *ts = handle;
352 if (unlikely(ts->state == CY_BL_STATE)) {
353 complete(&ts->bl_ready);
357 /* Get touch data from CYTTSP device */
358 error = ttsp_read_block_data(ts, CY_REG_BASE,
359 sizeof(struct cyttsp_xydata), &ts->xy_data);
363 /* provide flow control handshake */
364 error = cyttsp_handshake(ts);
368 if (unlikely(ts->state == CY_IDLE_STATE))
371 if (GET_BOOTLOADERMODE(ts->xy_data.tt_mode)) {
373 * TTSP device has reset back to bootloader mode.
374 * Restore to operational mode.
376 error = cyttsp_exit_bl_mode(ts);
379 "Could not return to operational mode, err: %d\n",
381 ts->state = CY_IDLE_STATE;
384 cyttsp_report_tchdata(ts);
391 static int cyttsp_power_on(struct cyttsp *ts)
395 error = cyttsp_soft_reset(ts);
399 error = cyttsp_load_bl_regs(ts);
403 if (GET_BOOTLOADERMODE(ts->bl_data.bl_status) &&
404 IS_VALID_APP(ts->bl_data.bl_status)) {
405 error = cyttsp_exit_bl_mode(ts);
410 if (GET_HSTMODE(ts->bl_data.bl_file) != CY_OPERATE_MODE ||
411 IS_OPERATIONAL_ERR(ts->bl_data.bl_status)) {
415 error = cyttsp_set_sysinfo_mode(ts);
419 error = cyttsp_set_sysinfo_regs(ts);
423 error = cyttsp_set_operational_mode(ts);
427 /* init active distance */
428 error = cyttsp_act_dist_setup(ts);
432 ts->state = CY_ACTIVE_STATE;
437 static int cyttsp_enable(struct cyttsp *ts)
442 * The device firmware can wake on an I2C or SPI memory slave
443 * address match. So just reading a register is sufficient to
444 * wake up the device. The first read attempt will fail but it
445 * will wake it up making the second read attempt successful.
447 error = ttsp_read_block_data(ts, CY_REG_BASE,
448 sizeof(ts->xy_data), &ts->xy_data);
452 if (GET_HSTMODE(ts->xy_data.hst_mode))
460 static int cyttsp_disable(struct cyttsp *ts)
464 error = ttsp_send_command(ts, CY_LOW_POWER_MODE);
468 disable_irq(ts->irq);
473 #ifdef CONFIG_PM_SLEEP
474 static int cyttsp_suspend(struct device *dev)
476 struct cyttsp *ts = dev_get_drvdata(dev);
479 mutex_lock(&ts->input->mutex);
481 if (ts->input->users) {
482 retval = cyttsp_disable(ts);
484 ts->suspended = true;
487 mutex_unlock(&ts->input->mutex);
492 static int cyttsp_resume(struct device *dev)
494 struct cyttsp *ts = dev_get_drvdata(dev);
496 mutex_lock(&ts->input->mutex);
498 if (ts->input->users)
501 ts->suspended = false;
503 mutex_unlock(&ts->input->mutex);
510 SIMPLE_DEV_PM_OPS(cyttsp_pm_ops, cyttsp_suspend, cyttsp_resume);
511 EXPORT_SYMBOL_GPL(cyttsp_pm_ops);
513 static int cyttsp_open(struct input_dev *dev)
515 struct cyttsp *ts = input_get_drvdata(dev);
519 retval = cyttsp_enable(ts);
524 static void cyttsp_close(struct input_dev *dev)
526 struct cyttsp *ts = input_get_drvdata(dev);
532 struct cyttsp *cyttsp_probe(const struct cyttsp_bus_ops *bus_ops,
533 struct device *dev, int irq, size_t xfer_buf_size)
535 const struct cyttsp_platform_data *pdata = dev->platform_data;
537 struct input_dev *input_dev;
540 if (!pdata || !pdata->name || irq <= 0) {
545 ts = kzalloc(sizeof(*ts) + xfer_buf_size, GFP_KERNEL);
546 input_dev = input_allocate_device();
547 if (!ts || !input_dev) {
553 ts->input = input_dev;
554 ts->pdata = dev->platform_data;
555 ts->bus_ops = bus_ops;
558 init_completion(&ts->bl_ready);
559 snprintf(ts->phys, sizeof(ts->phys), "%s/input0", dev_name(dev));
562 error = pdata->init();
564 dev_err(ts->dev, "platform init failed, err: %d\n",
570 input_dev->name = pdata->name;
571 input_dev->phys = ts->phys;
572 input_dev->id.bustype = bus_ops->bustype;
573 input_dev->dev.parent = ts->dev;
575 input_dev->open = cyttsp_open;
576 input_dev->close = cyttsp_close;
578 input_set_drvdata(input_dev, ts);
580 __set_bit(EV_ABS, input_dev->evbit);
581 input_set_abs_params(input_dev, ABS_MT_POSITION_X,
582 0, pdata->maxx, 0, 0);
583 input_set_abs_params(input_dev, ABS_MT_POSITION_Y,
584 0, pdata->maxy, 0, 0);
585 input_set_abs_params(input_dev, ABS_MT_TOUCH_MAJOR,
588 input_mt_init_slots(input_dev, CY_MAX_ID, 0);
590 error = request_threaded_irq(ts->irq, NULL, cyttsp_irq,
591 IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
594 dev_err(ts->dev, "failed to request IRQ %d, err: %d\n",
596 goto err_platform_exit;
599 disable_irq(ts->irq);
601 error = cyttsp_power_on(ts);
605 error = input_register_device(input_dev);
607 dev_err(ts->dev, "failed to register input device: %d\n",
615 free_irq(ts->irq, ts);
620 input_free_device(input_dev);
623 return ERR_PTR(error);
625 EXPORT_SYMBOL_GPL(cyttsp_probe);
627 void cyttsp_remove(struct cyttsp *ts)
629 free_irq(ts->irq, ts);
630 input_unregister_device(ts->input);
635 EXPORT_SYMBOL_GPL(cyttsp_remove);
637 MODULE_LICENSE("GPL");
638 MODULE_DESCRIPTION("Cypress TrueTouch(R) Standard touchscreen driver core");
639 MODULE_AUTHOR("Cypress");