2 * clearpad_tm1217.c - Touch Screen driver for Synaptics Clearpad
5 * Copyright (C) 2008 Intel Corp
7 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; version 2 of the License.
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
18 * You should have received a copy of the GNU General Public License along
19 * with this program; ifnot, write to the Free Software Foundation, Inc.,
20 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
22 * Questions/Comments/Bug fixes to Ramesh Agarwal (ramesh.agarwal@intel.com)
23 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
26 #include <linux/module.h>
27 #include <linux/kernel.h>
28 #include <linux/input.h>
29 #include <linux/interrupt.h>
31 #include <linux/i2c.h>
32 #include <linux/timer.h>
33 #include <linux/gpio.h>
34 #include <linux/hrtimer.h>
35 #include <linux/kthread.h>
36 #include <linux/delay.h>
37 #include <linux/slab.h>
38 #include "cp_tm1217.h"
40 #define CPTM1217_DEVICE_NAME "cptm1217"
41 #define CPTM1217_DRIVER_NAME CPTM1217_DEVICE_NAME
43 #define MAX_TOUCH_SUPPORTED 2
44 #define TOUCH_SUPPORTED 1
45 #define SAMPLING_FREQ 80 /* Frequency in HZ */
46 #define DELAY_BTWIN_SAMPLE (1000 / SAMPLING_FREQ)
47 #define WAIT_FOR_RESPONSE 5 /* 5msec just works */
48 #define MAX_RETRIES 5 /* As above */
49 #define INCREMENTAL_DELAY 5 /* As above */
51 /* Regster Definitions */
52 #define TMA1217_DEV_STATUS 0x13 /* Device Status */
53 #define TMA1217_INT_STATUS 0x14 /* Interrupt Status */
55 /* Controller can detect upto 2 possible finger touches.
56 * Each finger touch provides 12 bit X Y co-ordinates, the values are split
57 * across 2 registers, and an 8 bit Z value */
58 #define TMA1217_FINGER_STATE 0x18 /* Finger State */
59 #define TMA1217_FINGER1_X_HIGHER8 0x19 /* Higher 8 bit of X coordinate */
60 #define TMA1217_FINGER1_Y_HIGHER8 0x1A /* Higher 8 bit of Y coordinate */
61 #define TMA1217_FINGER1_XY_LOWER4 0x1B /* Lower 4 bits of X and Y */
62 #define TMA1217_FINGER1_Z_VALUE 0x1D /* 8 bit Z value for finger 1 */
63 #define TMA1217_FINGER2_X_HIGHER8 0x1E /* Higher 8 bit of X coordinate */
64 #define TMA1217_FINGER2_Y_HIGHER8 0x1F /* Higher 8 bit of Y coordinate */
65 #define TMA1217_FINGER2_XY_LOWER4 0x20 /* Lower 4 bits of X and Y */
66 #define TMA1217_FINGER2_Z_VALUE 0x22 /* 8 bit Z value for finger 2 */
67 #define TMA1217_DEVICE_CTRL 0x23 /* Device Control */
68 #define TMA1217_INTERRUPT_ENABLE 0x24 /* Interrupt Enable */
69 #define TMA1217_REPORT_MODE 0x2B /* Reporting Mode */
70 #define TMA1217_MAX_X_LOWER8 0x31 /* Bit 0-7 for Max X */
71 #define TMA1217_MAX_X_HIGHER4 0x32 /* Bit 8-11 for Max X */
72 #define TMA1217_MAX_Y_LOWER8 0x33 /* Bit 0-7 for Max Y */
73 #define TMA1217_MAX_Y_HIGHER4 0x34 /* Bit 8-11 for Max Y */
74 #define TMA1217_DEVICE_CMD_RESET 0x67 /* Device CMD reg for reset */
75 #define TMA1217_DEVICE_CMD_REZERO 0x69 /* Device CMD reg for rezero */
77 #define TMA1217_MANUFACTURER_ID 0x73 /* Manufacturer Id */
78 #define TMA1217_PRODUCT_FAMILY 0x75 /* Product Family */
79 #define TMA1217_FIRMWARE_REVISION 0x76 /* Firmware Revision */
80 #define TMA1217_SERIAL_NO_HIGH 0x7C /* Bit 8-15 of device serial no. */
81 #define TMA1217_SERIAL_NO_LOW 0x7D /* Bit 0-7 of device serial no. */
82 #define TMA1217_PRODUCT_ID_START 0x7E /* Start address for 10 byte ID */
83 #define TMA1217_DEVICE_CAPABILITY 0x8B /* Reporting capability */
87 * The touch position structure.
95 /* Device Specific info given by the controller */
101 /* Vendor related info given by the controller */
102 struct cp_vendor_info {
110 * Private structure to store the device details
112 struct cp_tm1217_device {
113 struct i2c_client *client;
115 struct cp_vendor_info vinfo;
116 struct cp_dev_info dinfo;
117 struct input_dev_info {
120 struct input_dev *input;
121 struct touch_state touch;
122 } cp_input_info[MAX_TOUCH_SUPPORTED];
125 struct mutex thread_mutex;
131 /* The following functions are used to read/write registers on the device
132 * as per the RMI prorocol. Technically, a page select should be written
133 * before doing read/write but since the register offsets are below 0xFF
134 * we can use the default value of page which is 0x00
136 static int cp_tm1217_read(struct cp_tm1217_device *ts,
141 /* Send the address */
142 retval = i2c_master_send(ts->client, &req[0], 1);
144 dev_err(ts->dev, "cp_tm1217: I2C send failed\n");
147 msleep(WAIT_FOR_RESPONSE);
148 for (i = 0; i < MAX_RETRIES; i++) {
149 retval = i2c_master_recv(ts->client, &req[1], size);
150 if (retval == size) {
153 msleep(INCREMENTAL_DELAY);
154 dev_dbg(ts->dev, "cp_tm1217: Retry count is %d\n", i);
158 dev_err(ts->dev, "cp_tm1217: Read from device failed\n");
163 static int cp_tm1217_write(struct cp_tm1217_device *ts,
168 /* Send the address and the data to be written */
169 retval = i2c_master_send(ts->client, &req[0], size + 1);
170 if (retval != size + 1) {
171 dev_err(ts->dev, "cp_tm1217: I2C write failed: %d\n", retval);
174 /* Wait for the write to complete. TBD why this is required */
175 msleep(WAIT_FOR_RESPONSE);
180 static int cp_tm1217_mask_interrupt(struct cp_tm1217_device *ts)
185 req[0] = TMA1217_INTERRUPT_ENABLE;
187 retval = cp_tm1217_write(ts, req, 1);
194 static int cp_tm1217_unmask_interrupt(struct cp_tm1217_device *ts)
199 req[0] = TMA1217_INTERRUPT_ENABLE;
201 retval = cp_tm1217_write(ts, req, 1);
208 static void process_touch(struct cp_tm1217_device *ts, int index)
211 struct input_dev_info *input_info =
212 (struct input_dev_info *)&ts->cp_input_info[index];
216 xy_data[0] = TMA1217_FINGER1_X_HIGHER8;
218 xy_data[0] = TMA1217_FINGER2_X_HIGHER8;
220 retval = cp_tm1217_read(ts, xy_data, 5);
222 dev_err(ts->dev, "cp_tm1217: XY read from device failed\n");
226 /* Note: Currently not using the Z values but may be requried in
228 input_info->touch.x = (xy_data[1] << 4)
229 | (xy_data[3] & 0x0F);
230 input_info->touch.y = (xy_data[2] << 4)
231 | ((xy_data[3] & 0xF0) >> 4);
232 input_report_abs(input_info->input, ABS_X, input_info->touch.x);
233 input_report_abs(input_info->input, ABS_Y, input_info->touch.y);
234 input_sync(input_info->input);
237 static void cp_tm1217_get_data(struct cp_tm1217_device *ts)
240 int retval, i, finger_touched = 0;
243 req[0] = TMA1217_FINGER_STATE;
244 retval = cp_tm1217_read(ts, req, 1);
247 "cp_tm1217: Read from device failed\n");
251 /* Start sampling until the pressure is below
253 for (i = 0; i < TOUCH_SUPPORTED; i++) {
256 if (ts->cp_input_info[i].touch.button == 0) {
257 /* send the button touch event */
259 ts->cp_input_info[i].input,
261 ts->cp_input_info[i].touch.button = 1;
263 process_touch(ts, i);
265 if (ts->cp_input_info[i].touch.button == 1) {
266 /* send the button release event */
268 ts->cp_input_info[i].input,
270 input_sync(ts->cp_input_info[i].input);
271 ts->cp_input_info[i].touch.button = 0;
274 req[1] = req[1] >> 2;
276 msleep(DELAY_BTWIN_SAMPLE);
277 } while (finger_touched > 0);
280 static irqreturn_t cp_tm1217_sample_thread(int irq, void *handle)
282 struct cp_tm1217_device *ts = (struct cp_tm1217_device *) handle;
286 /* Chedk if another thread is already running */
287 mutex_lock(&ts->thread_mutex);
288 if (ts->thread_running == 1) {
289 mutex_unlock(&ts->thread_mutex);
292 ts->thread_running = 1;
293 mutex_unlock(&ts->thread_mutex);
296 /* Mask the interrupts */
297 retval = cp_tm1217_mask_interrupt(ts);
299 /* Read the Interrupt Status register to find the cause of the
301 req[0] = TMA1217_INT_STATUS;
302 retval = cp_tm1217_read(ts, req, 1);
309 cp_tm1217_get_data(ts);
312 /* Unmask the interrupts before going to sleep */
313 retval = cp_tm1217_unmask_interrupt(ts);
315 mutex_lock(&ts->thread_mutex);
316 ts->thread_running = 0;
317 mutex_unlock(&ts->thread_mutex);
322 static int cp_tm1217_init_data(struct cp_tm1217_device *ts)
327 /* Read the vendor id/ fw revision etc. Ignoring return check as this
328 is non critical info */
329 req[0] = TMA1217_MANUFACTURER_ID;
330 retval = cp_tm1217_read(ts, req, 1);
331 ts->vinfo.vendor_id = req[1];
333 req[0] = TMA1217_PRODUCT_FAMILY;
334 retval = cp_tm1217_read(ts, req, 1);
335 ts->vinfo.product_family = req[1];
337 req[0] = TMA1217_FIRMWARE_REVISION;
338 retval = cp_tm1217_read(ts, req, 1);
339 ts->vinfo.firmware_rev = req[1];
341 req[0] = TMA1217_SERIAL_NO_HIGH;
342 retval = cp_tm1217_read(ts, req, 1);
343 ts->vinfo.serial_no = (req[1] << 8);
345 req[0] = TMA1217_SERIAL_NO_LOW;
346 retval = cp_tm1217_read(ts, req, 1);
347 ts->vinfo.serial_no = ts->vinfo.serial_no | req[1];
349 req[0] = TMA1217_MAX_X_HIGHER4;
350 retval = cp_tm1217_read(ts, req, 1);
351 ts->dinfo.maxX = (req[1] & 0xF) << 8;
353 req[0] = TMA1217_MAX_X_LOWER8;
354 retval = cp_tm1217_read(ts, req, 1);
355 ts->dinfo.maxX = ts->dinfo.maxX | req[1];
357 req[0] = TMA1217_MAX_Y_HIGHER4;
358 retval = cp_tm1217_read(ts, req, 1);
359 ts->dinfo.maxY = (req[1] & 0xF) << 8;
361 req[0] = TMA1217_MAX_Y_LOWER8;
362 retval = cp_tm1217_read(ts, req, 1);
363 ts->dinfo.maxY = ts->dinfo.maxY | req[1];
370 * Set up a GPIO for use as the interrupt. We can't simply do this at
371 * boot time because the GPIO drivers themselves may not be around at
372 * boot/firmware set up time to do the work. Instead defer it to driver
376 static int cp_tm1217_setup_gpio_irq(struct cp_tm1217_device *ts)
380 /* Hook up the irq handler */
381 retval = gpio_request(ts->gpio, "cp_tm1217_touch");
383 dev_err(ts->dev, "cp_tm1217: GPIO request failed error %d\n",
388 retval = gpio_direction_input(ts->gpio);
391 "cp_tm1217: GPIO direction configuration failed, error %d\n",
397 retval = gpio_to_irq(ts->gpio);
399 dev_err(ts->dev, "cp_tm1217: GPIO to IRQ failedi,"
400 " error %d\n", retval);
404 "cp_tm1217: Got IRQ number is %d for GPIO %d\n",
409 static int cp_tm1217_probe(struct i2c_client *client,
410 const struct i2c_device_id *id)
412 struct cp_tm1217_device *ts;
413 struct input_dev *input_dev;
414 struct input_dev_info *input_info;
415 struct cp_tm1217_platform_data *pdata;
419 /* No pdata is fine - we then use "normal" IRQ mode */
421 pdata = client->dev.platform_data;
423 ts = kzalloc(sizeof(struct cp_tm1217_device), GFP_KERNEL);
425 dev_err(&client->dev,
426 "cp_tm1217: Private Device Struct alloc failed\n");
431 ts->dev = &client->dev;
432 i2c_set_clientdata(client, ts);
434 ts->thread_running = 0;
435 mutex_init(&ts->thread_mutex);
437 /* Reset the Controller */
438 req[0] = TMA1217_DEVICE_CMD_RESET;
440 retval = cp_tm1217_write(ts, req, 1);
442 dev_err(ts->dev, "cp_tm1217: Controller reset failed\n");
447 /* Clear up the interrupt status from reset. */
448 req[0] = TMA1217_INT_STATUS;
449 retval = cp_tm1217_read(ts, req, 1);
451 /* Mask all the interrupts */
452 retval = cp_tm1217_mask_interrupt(ts);
454 /* Read the controller information */
455 cp_tm1217_init_data(ts);
457 /* The following code will register multiple event devices when
458 multi-pointer is enabled, the code has not been tested
460 for (i = 0; i < TOUCH_SUPPORTED; i++) {
461 input_dev = input_allocate_device();
462 if (input_dev == NULL) {
464 "cp_tm1217:Input Device Struct alloc failed\n");
468 input_info = &ts->cp_input_info[i];
469 snprintf(input_info->name, sizeof(input_info->name),
470 "cp_tm1217_touchscreen_%d", i);
471 input_dev->name = input_info->name;
472 snprintf(input_info->phys, sizeof(input_info->phys),
473 "%s/input%d", dev_name(&client->dev), i);
475 input_dev->phys = input_info->phys;
476 input_dev->id.bustype = BUS_I2C;
478 input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
479 input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
481 input_set_abs_params(input_dev, ABS_X, 0, ts->dinfo.maxX, 0, 0);
482 input_set_abs_params(input_dev, ABS_Y, 0, ts->dinfo.maxY, 0, 0);
484 retval = input_register_device(input_dev);
487 "Input dev registration failed for %s\n",
491 input_info->input = input_dev;
494 /* Setup the reporting mode to send an interrupt only when
495 finger arrives or departs. */
496 req[0] = TMA1217_REPORT_MODE;
498 retval = cp_tm1217_write(ts, req, 1);
500 /* Setup the device to no sleep mode for now and make it configured */
501 req[0] = TMA1217_DEVICE_CTRL;
503 retval = cp_tm1217_write(ts, req, 1);
505 /* Check for the status of the device */
506 req[0] = TMA1217_DEV_STATUS;
507 retval = cp_tm1217_read(ts, req, 1);
510 "cp_tm1217: Device Status 0x%x != 0: config failed\n",
517 if (pdata && pdata->gpio) {
518 ts->gpio = pdata->gpio;
519 retval = cp_tm1217_setup_gpio_irq(ts);
521 retval = client->irq;
524 dev_err(ts->dev, "cp_tm1217: GPIO request failed error %d\n",
529 client->irq = retval;
532 retval = request_threaded_irq(client->irq,
533 NULL, cp_tm1217_sample_thread,
534 IRQF_TRIGGER_FALLING, "cp_tm1217_touch", ts);
536 dev_err(ts->dev, "cp_tm1217: Request IRQ error %d\n", retval);
540 /* Unmask the interrupts */
541 retval = cp_tm1217_unmask_interrupt(ts);
545 free_irq(client->irq, ts);
550 /* Clean up before returning failure */
551 for (i = 0; i < TOUCH_SUPPORTED; i++) {
552 if (ts->cp_input_info[i].input) {
553 input_unregister_device(ts->cp_input_info[i].input);
554 input_free_device(ts->cp_input_info[i].input);
566 static int cp_tm1217_suspend(struct i2c_client *client, pm_message_t mesg)
568 struct cp_tm1217_device *ts = i2c_get_clientdata(client);
572 /* Put the controller to sleep */
573 req[0] = TMA1217_DEVICE_CTRL;
574 retval = cp_tm1217_read(ts, req, 1);
575 req[1] = (req[1] & 0xF8) | 0x1;
576 retval = cp_tm1217_write(ts, req, 1);
578 if (device_may_wakeup(&client->dev))
579 enable_irq_wake(client->irq);
588 static int cp_tm1217_resume(struct i2c_client *client)
590 struct cp_tm1217_device *ts = i2c_get_clientdata(client);
594 /* Take the controller out of sleep */
595 req[0] = TMA1217_DEVICE_CTRL;
596 retval = cp_tm1217_read(ts, req, 1);
597 req[1] = (req[1] & 0xF8) | 0x4;
598 retval = cp_tm1217_write(ts, req, 1);
600 /* Restore the register settings sinc the power to the
601 could have been cut off */
603 /* Setup the reporting mode to send an interrupt only when
604 finger arrives or departs. */
605 req[0] = TMA1217_REPORT_MODE;
607 retval = cp_tm1217_write(ts, req, 1);
609 /* Setup the device to no sleep mode for now and make it configured */
610 req[0] = TMA1217_DEVICE_CTRL;
612 retval = cp_tm1217_write(ts, req, 1);
614 /* Setup the interrupt mask */
615 retval = cp_tm1217_unmask_interrupt(ts);
617 if (device_may_wakeup(&client->dev))
618 disable_irq_wake(client->irq);
627 static int cp_tm1217_remove(struct i2c_client *client)
629 struct cp_tm1217_device *ts = i2c_get_clientdata(client);
632 free_irq(client->irq, ts);
635 for (i = 0; i < TOUCH_SUPPORTED; i++)
636 input_unregister_device(ts->cp_input_info[i].input);
641 static struct i2c_device_id cp_tm1217_idtable[] = {
642 { CPTM1217_DEVICE_NAME, 0 },
646 MODULE_DEVICE_TABLE(i2c, cp_tm1217_idtable);
648 static struct i2c_driver cp_tm1217_driver = {
650 .owner = THIS_MODULE,
651 .name = CPTM1217_DRIVER_NAME,
653 .id_table = cp_tm1217_idtable,
654 .probe = cp_tm1217_probe,
655 .remove = cp_tm1217_remove,
656 .suspend = cp_tm1217_suspend,
657 .resume = cp_tm1217_resume,
660 static int __init clearpad_tm1217_init(void)
662 return i2c_add_driver(&cp_tm1217_driver);
665 static void __exit clearpad_tm1217_exit(void)
667 i2c_del_driver(&cp_tm1217_driver);
670 module_init(clearpad_tm1217_init);
671 module_exit(clearpad_tm1217_exit);
673 MODULE_AUTHOR("Ramesh Agarwal <ramesh.agarwal@intel.com>");
674 MODULE_DESCRIPTION("Synaptics TM1217 TouchScreen Driver");
675 MODULE_LICENSE("GPL v2");