2 * Elan Microelectronics touch panels with I2C interface
4 * Copyright (C) 2014 Elan Microelectronics Corporation.
5 * Scott Liu <scott.liu@emc.com.tw>
7 * This code is partly based on hid-multitouch.c:
9 * Copyright (c) 2010-2012 Stephane Chatty <chatty@enac.fr>
10 * Copyright (c) 2010-2012 Benjamin Tissoires <benjamin.tissoires@gmail.com>
11 * Copyright (c) 2010-2012 Ecole Nationale de l'Aviation Civile, France
14 * This code is partly based on i2c-hid.c:
16 * Copyright (c) 2012 Benjamin Tissoires <benjamin.tissoires@gmail.com>
17 * Copyright (c) 2012 Ecole Nationale de l'Aviation Civile, France
18 * Copyright (c) 2012 Red Hat, Inc
22 * This software is licensed under the terms of the GNU General Public
23 * License version 2, as published by the Free Software Foundation, and
24 * may be copied, distributed, and modified under those terms.
27 #include <linux/module.h>
28 #include <linux/input.h>
29 #include <linux/interrupt.h>
30 #include <linux/platform_device.h>
31 #include <linux/async.h>
32 #include <linux/i2c.h>
33 #include <linux/delay.h>
34 #include <linux/uaccess.h>
35 #include <linux/buffer_head.h>
36 #include <linux/slab.h>
37 #include <linux/firmware.h>
38 #include <linux/input/mt.h>
39 #include <linux/acpi.h>
41 #include <linux/gpio/consumer.h>
42 #include <linux/regulator/consumer.h>
43 #include <linux/uuid.h>
44 #include <asm/unaligned.h>
46 /* Device, Driver information */
47 #define DEVICE_NAME "elants_i2c"
48 #define DRV_VERSION "1.0.9"
50 /* Convert from rows or columns into resolution */
51 #define ELAN_TS_RESOLUTION(n, m) (((n) - 1) * (m))
56 #define FW_HDR_COUNT 1
57 #define FW_HDR_LENGTH 2
59 /* Buffer mode Queue Header information */
60 #define QUEUE_HEADER_SINGLE 0x62
61 #define QUEUE_HEADER_NORMAL 0X63
62 #define QUEUE_HEADER_WAIT 0x64
64 /* Command header definition */
65 #define CMD_HEADER_WRITE 0x54
66 #define CMD_HEADER_READ 0x53
67 #define CMD_HEADER_6B_READ 0x5B
68 #define CMD_HEADER_RESP 0x52
69 #define CMD_HEADER_6B_RESP 0x9B
70 #define CMD_HEADER_HELLO 0x55
71 #define CMD_HEADER_REK 0x66
73 /* FW position data */
74 #define PACKET_SIZE 55
75 #define MAX_CONTACT_NUM 10
76 #define FW_POS_HEADER 0
77 #define FW_POS_STATE 1
78 #define FW_POS_TOTAL 2
80 #define FW_POS_CHECKSUM 34
81 #define FW_POS_WIDTH 35
82 #define FW_POS_PRESSURE 45
84 #define HEADER_REPORT_10_FINGER 0x62
86 /* Header (4 bytes) plus 3 fill 10-finger packets */
87 #define MAX_PACKET_SIZE 169
89 #define BOOT_TIME_DELAY_MS 50
91 /* FW read command, 0x53 0x?? 0x0, 0x01 */
92 #define E_ELAN_INFO_FW_VER 0x00
93 #define E_ELAN_INFO_BC_VER 0x10
94 #define E_ELAN_INFO_TEST_VER 0xE0
95 #define E_ELAN_INFO_FW_ID 0xF0
96 #define E_INFO_OSR 0xD6
97 #define E_INFO_PHY_SCAN 0xD7
98 #define E_INFO_PHY_DRIVER 0xD8
100 #define MAX_RETRIES 3
101 #define MAX_FW_UPDATE_RETRIES 30
103 #define ELAN_FW_PAGESIZE 132
105 /* calibration timeout definition */
106 #define ELAN_CALI_TIMEOUT_MSEC 12000
108 #define ELAN_POWERON_DELAY_USEC 500
109 #define ELAN_RESET_DELAY_MSEC 20
113 ELAN_WAIT_QUEUE_HEADER,
114 ELAN_WAIT_RECALIBRATION,
117 enum elants_iap_mode {
118 ELAN_IAP_OPERATIONAL,
122 /* struct elants_data - represents state of Elan touchscreen device */
124 struct i2c_client *client;
125 struct input_dev *input;
127 struct regulator *vcc33;
128 struct regulator *vccio;
129 struct gpio_desc *reset_gpio;
137 unsigned int x_res; /* resolution in units/mm */
142 enum elants_state state;
143 enum elants_iap_mode iap_mode;
145 /* Guards against concurrent access to the device via sysfs */
146 struct mutex sysfs_mutex;
148 u8 cmd_resp[HEADER_SIZE];
149 struct completion cmd_done;
151 u8 buf[MAX_PACKET_SIZE];
153 bool wake_irq_enabled;
154 bool keep_power_in_suspend;
157 static int elants_i2c_send(struct i2c_client *client,
158 const void *data, size_t size)
162 ret = i2c_master_send(client, data, size);
169 dev_err(&client->dev, "%s failed (%*ph): %d\n",
170 __func__, (int)size, data, ret);
175 static int elants_i2c_read(struct i2c_client *client, void *data, size_t size)
179 ret = i2c_master_recv(client, data, size);
186 dev_err(&client->dev, "%s failed: %d\n", __func__, ret);
191 static int elants_i2c_execute_command(struct i2c_client *client,
192 const u8 *cmd, size_t cmd_size,
193 u8 *resp, size_t resp_size)
195 struct i2c_msg msgs[2];
197 u8 expected_response;
200 case CMD_HEADER_READ:
201 expected_response = CMD_HEADER_RESP;
204 case CMD_HEADER_6B_READ:
205 expected_response = CMD_HEADER_6B_RESP;
209 dev_err(&client->dev, "%s: invalid command %*ph\n",
210 __func__, (int)cmd_size, cmd);
214 msgs[0].addr = client->addr;
215 msgs[0].flags = client->flags & I2C_M_TEN;
216 msgs[0].len = cmd_size;
217 msgs[0].buf = (u8 *)cmd;
219 msgs[1].addr = client->addr;
220 msgs[1].flags = client->flags & I2C_M_TEN;
221 msgs[1].flags |= I2C_M_RD;
222 msgs[1].len = resp_size;
225 ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
229 if (ret != ARRAY_SIZE(msgs) || resp[FW_HDR_TYPE] != expected_response)
235 static int elants_i2c_calibrate(struct elants_data *ts)
237 struct i2c_client *client = ts->client;
239 static const u8 w_flashkey[] = { 0x54, 0xC0, 0xE1, 0x5A };
240 static const u8 rek[] = { 0x54, 0x29, 0x00, 0x01 };
241 static const u8 rek_resp[] = { CMD_HEADER_REK, 0x66, 0x66, 0x66 };
243 disable_irq(client->irq);
245 ts->state = ELAN_WAIT_RECALIBRATION;
246 reinit_completion(&ts->cmd_done);
248 elants_i2c_send(client, w_flashkey, sizeof(w_flashkey));
249 elants_i2c_send(client, rek, sizeof(rek));
251 enable_irq(client->irq);
253 ret = wait_for_completion_interruptible_timeout(&ts->cmd_done,
254 msecs_to_jiffies(ELAN_CALI_TIMEOUT_MSEC));
256 ts->state = ELAN_STATE_NORMAL;
259 error = ret < 0 ? ret : -ETIMEDOUT;
260 dev_err(&client->dev,
261 "error while waiting for calibration to complete: %d\n",
266 if (memcmp(rek_resp, ts->cmd_resp, sizeof(rek_resp))) {
267 dev_err(&client->dev,
268 "unexpected calibration response: %*ph\n",
269 (int)sizeof(ts->cmd_resp), ts->cmd_resp);
276 static int elants_i2c_sw_reset(struct i2c_client *client)
278 const u8 soft_rst_cmd[] = { 0x77, 0x77, 0x77, 0x77 };
281 error = elants_i2c_send(client, soft_rst_cmd,
282 sizeof(soft_rst_cmd));
284 dev_err(&client->dev, "software reset failed: %d\n", error);
289 * We should wait at least 10 msec (but no more than 40) before
290 * sending fastboot or IAP command to the device.
297 static u16 elants_i2c_parse_version(u8 *buf)
299 return get_unaligned_be32(buf) >> 4;
302 static int elants_i2c_query_hw_version(struct elants_data *ts)
304 struct i2c_client *client = ts->client;
305 int error, retry_cnt;
306 const u8 cmd[] = { CMD_HEADER_READ, E_ELAN_INFO_FW_ID, 0x00, 0x01 };
307 u8 resp[HEADER_SIZE];
309 for (retry_cnt = 0; retry_cnt < MAX_RETRIES; retry_cnt++) {
310 error = elants_i2c_execute_command(client, cmd, sizeof(cmd),
313 ts->hw_version = elants_i2c_parse_version(resp);
314 if (ts->hw_version != 0xffff)
318 dev_dbg(&client->dev, "read fw id error=%d, buf=%*phC\n",
319 error, (int)sizeof(resp), resp);
323 dev_err(&client->dev,
324 "Failed to read fw id: %d\n", error);
328 dev_err(&client->dev, "Invalid fw id: %#04x\n", ts->hw_version);
333 static int elants_i2c_query_fw_version(struct elants_data *ts)
335 struct i2c_client *client = ts->client;
336 int error, retry_cnt;
337 const u8 cmd[] = { CMD_HEADER_READ, E_ELAN_INFO_FW_VER, 0x00, 0x01 };
338 u8 resp[HEADER_SIZE];
340 for (retry_cnt = 0; retry_cnt < MAX_RETRIES; retry_cnt++) {
341 error = elants_i2c_execute_command(client, cmd, sizeof(cmd),
344 ts->fw_version = elants_i2c_parse_version(resp);
345 if (ts->fw_version != 0x0000 &&
346 ts->fw_version != 0xffff)
350 dev_dbg(&client->dev, "read fw version error=%d, buf=%*phC\n",
351 error, (int)sizeof(resp), resp);
354 dev_err(&client->dev,
355 "Failed to read fw version or fw version is invalid\n");
360 static int elants_i2c_query_test_version(struct elants_data *ts)
362 struct i2c_client *client = ts->client;
363 int error, retry_cnt;
365 const u8 cmd[] = { CMD_HEADER_READ, E_ELAN_INFO_TEST_VER, 0x00, 0x01 };
366 u8 resp[HEADER_SIZE];
368 for (retry_cnt = 0; retry_cnt < MAX_RETRIES; retry_cnt++) {
369 error = elants_i2c_execute_command(client, cmd, sizeof(cmd),
372 version = elants_i2c_parse_version(resp);
373 ts->test_version = version >> 8;
374 ts->solution_version = version & 0xff;
379 dev_dbg(&client->dev,
380 "read test version error rc=%d, buf=%*phC\n",
381 error, (int)sizeof(resp), resp);
384 dev_err(&client->dev, "Failed to read test version\n");
389 static int elants_i2c_query_bc_version(struct elants_data *ts)
391 struct i2c_client *client = ts->client;
392 const u8 cmd[] = { CMD_HEADER_READ, E_ELAN_INFO_BC_VER, 0x00, 0x01 };
393 u8 resp[HEADER_SIZE];
397 error = elants_i2c_execute_command(client, cmd, sizeof(cmd),
400 dev_err(&client->dev,
401 "read BC version error=%d, buf=%*phC\n",
402 error, (int)sizeof(resp), resp);
406 version = elants_i2c_parse_version(resp);
407 ts->bc_version = version >> 8;
408 ts->iap_version = version & 0xff;
413 static int elants_i2c_query_ts_info(struct elants_data *ts)
415 struct i2c_client *client = ts->client;
418 u16 phy_x, phy_y, rows, cols, osr;
419 const u8 get_resolution_cmd[] = {
420 CMD_HEADER_6B_READ, 0x00, 0x00, 0x00, 0x00, 0x00
422 const u8 get_osr_cmd[] = {
423 CMD_HEADER_READ, E_INFO_OSR, 0x00, 0x01
425 const u8 get_physical_scan_cmd[] = {
426 CMD_HEADER_READ, E_INFO_PHY_SCAN, 0x00, 0x01
428 const u8 get_physical_drive_cmd[] = {
429 CMD_HEADER_READ, E_INFO_PHY_DRIVER, 0x00, 0x01
432 /* Get trace number */
433 error = elants_i2c_execute_command(client,
435 sizeof(get_resolution_cmd),
438 dev_err(&client->dev, "get resolution command failed: %d\n",
443 rows = resp[2] + resp[6] + resp[10];
444 cols = resp[3] + resp[7] + resp[11];
446 /* Process mm_to_pixel information */
447 error = elants_i2c_execute_command(client,
448 get_osr_cmd, sizeof(get_osr_cmd),
451 dev_err(&client->dev, "get osr command failed: %d\n",
458 error = elants_i2c_execute_command(client,
459 get_physical_scan_cmd,
460 sizeof(get_physical_scan_cmd),
463 dev_err(&client->dev, "get physical scan command failed: %d\n",
468 phy_x = get_unaligned_be16(&resp[2]);
470 error = elants_i2c_execute_command(client,
471 get_physical_drive_cmd,
472 sizeof(get_physical_drive_cmd),
475 dev_err(&client->dev, "get physical drive command failed: %d\n",
480 phy_y = get_unaligned_be16(&resp[2]);
482 dev_dbg(&client->dev, "phy_x=%d, phy_y=%d\n", phy_x, phy_y);
484 if (rows == 0 || cols == 0 || osr == 0) {
485 dev_warn(&client->dev,
486 "invalid trace number data: %d, %d, %d\n",
489 /* translate trace number to TS resolution */
490 ts->x_max = ELAN_TS_RESOLUTION(rows, osr);
491 ts->x_res = DIV_ROUND_CLOSEST(ts->x_max, phy_x);
492 ts->y_max = ELAN_TS_RESOLUTION(cols, osr);
493 ts->y_res = DIV_ROUND_CLOSEST(ts->y_max, phy_y);
499 static int elants_i2c_fastboot(struct i2c_client *client)
501 const u8 boot_cmd[] = { 0x4D, 0x61, 0x69, 0x6E };
504 error = elants_i2c_send(client, boot_cmd, sizeof(boot_cmd));
506 dev_err(&client->dev, "boot failed: %d\n", error);
510 dev_dbg(&client->dev, "boot success -- 0x%x\n", client->addr);
514 static int elants_i2c_initialize(struct elants_data *ts)
516 struct i2c_client *client = ts->client;
517 int error, error2, retry_cnt;
518 const u8 hello_packet[] = { 0x55, 0x55, 0x55, 0x55 };
519 const u8 recov_packet[] = { 0x55, 0x55, 0x80, 0x80 };
522 for (retry_cnt = 0; retry_cnt < MAX_RETRIES; retry_cnt++) {
523 error = elants_i2c_sw_reset(client);
525 /* Continue initializing if it's the last try */
526 if (retry_cnt < MAX_RETRIES - 1)
530 error = elants_i2c_fastboot(client);
532 /* Continue initializing if it's the last try */
533 if (retry_cnt < MAX_RETRIES - 1)
537 /* Wait for Hello packet */
538 msleep(BOOT_TIME_DELAY_MS);
540 error = elants_i2c_read(client, buf, sizeof(buf));
542 dev_err(&client->dev,
543 "failed to read 'hello' packet: %d\n", error);
544 } else if (!memcmp(buf, hello_packet, sizeof(hello_packet))) {
545 ts->iap_mode = ELAN_IAP_OPERATIONAL;
547 } else if (!memcmp(buf, recov_packet, sizeof(recov_packet))) {
549 * Setting error code will mark device
550 * in recovery mode below.
556 dev_err(&client->dev,
557 "invalid 'hello' packet: %*ph\n",
558 (int)sizeof(buf), buf);
562 /* hw version is available even if device in recovery state */
563 error2 = elants_i2c_query_hw_version(ts);
568 error = elants_i2c_query_fw_version(ts);
570 error = elants_i2c_query_test_version(ts);
572 error = elants_i2c_query_bc_version(ts);
574 error = elants_i2c_query_ts_info(ts);
577 ts->iap_mode = ELAN_IAP_RECOVERY;
583 * Firmware update interface.
586 static int elants_i2c_fw_write_page(struct i2c_client *client,
589 const u8 ack_ok[] = { 0xaa, 0xaa };
594 for (retry = 0; retry < MAX_FW_UPDATE_RETRIES; retry++) {
595 error = elants_i2c_send(client, page, ELAN_FW_PAGESIZE);
597 dev_err(&client->dev,
598 "IAP Write Page failed: %d\n", error);
602 error = elants_i2c_read(client, buf, 2);
604 dev_err(&client->dev,
605 "IAP Ack read failed: %d\n", error);
609 if (!memcmp(buf, ack_ok, sizeof(ack_ok)))
613 dev_err(&client->dev,
614 "IAP Get Ack Error [%02x:%02x]\n",
621 static int elants_i2c_do_update_firmware(struct i2c_client *client,
622 const struct firmware *fw,
625 const u8 enter_iap[] = { 0x45, 0x49, 0x41, 0x50 };
626 const u8 enter_iap2[] = { 0x54, 0x00, 0x12, 0x34 };
627 const u8 iap_ack[] = { 0x55, 0xaa, 0x33, 0xcc };
628 const u8 close_idle[] = {0x54, 0x2c, 0x01, 0x01};
631 int page, n_fw_pages;
634 /* Recovery mode detection! */
636 dev_dbg(&client->dev, "Recovery mode procedure\n");
637 error = elants_i2c_send(client, enter_iap2, sizeof(enter_iap2));
639 /* Start IAP Procedure */
640 dev_dbg(&client->dev, "Normal IAP procedure\n");
641 /* Close idle mode */
642 error = elants_i2c_send(client, close_idle, sizeof(close_idle));
644 dev_err(&client->dev, "Failed close idle: %d\n", error);
646 elants_i2c_sw_reset(client);
648 error = elants_i2c_send(client, enter_iap, sizeof(enter_iap));
652 dev_err(&client->dev, "failed to enter IAP mode: %d\n", error);
658 /* check IAP state */
659 error = elants_i2c_read(client, buf, 4);
661 dev_err(&client->dev,
662 "failed to read IAP acknowledgement: %d\n",
667 if (memcmp(buf, iap_ack, sizeof(iap_ack))) {
668 dev_err(&client->dev,
669 "failed to enter IAP: %*ph (expected %*ph)\n",
670 (int)sizeof(buf), buf, (int)sizeof(iap_ack), iap_ack);
674 dev_info(&client->dev, "successfully entered IAP mode");
676 send_id = client->addr;
677 error = elants_i2c_send(client, &send_id, 1);
679 dev_err(&client->dev, "sending dummy byte failed: %d\n",
684 /* Clear the last page of Master */
685 error = elants_i2c_send(client, fw->data, ELAN_FW_PAGESIZE);
687 dev_err(&client->dev, "clearing of the last page failed: %d\n",
692 error = elants_i2c_read(client, buf, 2);
694 dev_err(&client->dev,
695 "failed to read ACK for clearing the last page: %d\n",
700 n_fw_pages = fw->size / ELAN_FW_PAGESIZE;
701 dev_dbg(&client->dev, "IAP Pages = %d\n", n_fw_pages);
703 for (page = 0; page < n_fw_pages; page++) {
704 error = elants_i2c_fw_write_page(client,
705 fw->data + page * ELAN_FW_PAGESIZE);
707 dev_err(&client->dev,
708 "failed to write FW page %d: %d\n",
714 /* Old iap needs to wait 200ms for WDT and rest is for hello packets */
717 dev_info(&client->dev, "firmware update completed\n");
721 static int elants_i2c_fw_update(struct elants_data *ts)
723 struct i2c_client *client = ts->client;
724 const struct firmware *fw;
728 fw_name = kasprintf(GFP_KERNEL, "/*(DEBLOBBED)*/", ts->hw_version);
732 dev_info(&client->dev, "requesting fw name = %s\n", fw_name);
733 error = reject_firmware(&fw, fw_name, &client->dev);
736 dev_err(&client->dev, "failed to request firmware: %d\n",
741 if (fw->size % ELAN_FW_PAGESIZE) {
742 dev_err(&client->dev, "invalid firmware length: %zu\n",
748 disable_irq(client->irq);
750 error = elants_i2c_do_update_firmware(client, fw,
751 ts->iap_mode == ELAN_IAP_RECOVERY);
753 dev_err(&client->dev, "firmware update failed: %d\n", error);
754 ts->iap_mode = ELAN_IAP_RECOVERY;
758 error = elants_i2c_initialize(ts);
760 dev_err(&client->dev,
761 "failed to initialize device after firmware update: %d\n",
763 ts->iap_mode = ELAN_IAP_RECOVERY;
767 ts->iap_mode = ELAN_IAP_OPERATIONAL;
770 ts->state = ELAN_STATE_NORMAL;
771 enable_irq(client->irq);
775 elants_i2c_calibrate(ts);
777 release_firmware(fw);
785 static void elants_i2c_mt_event(struct elants_data *ts, u8 *buf)
787 struct input_dev *input = ts->input;
788 unsigned int n_fingers;
792 n_fingers = buf[FW_POS_STATE + 1] & 0x0f;
793 finger_state = ((buf[FW_POS_STATE + 1] & 0x30) << 4) |
796 dev_dbg(&ts->client->dev,
797 "n_fingers: %u, state: %04x\n", n_fingers, finger_state);
799 for (i = 0; i < MAX_CONTACT_NUM && n_fingers; i++) {
800 if (finger_state & 1) {
801 unsigned int x, y, p, w;
804 pos = &buf[FW_POS_XY + i * 3];
805 x = (((u16)pos[0] & 0xf0) << 4) | pos[1];
806 y = (((u16)pos[0] & 0x0f) << 8) | pos[2];
807 p = buf[FW_POS_PRESSURE + i];
808 w = buf[FW_POS_WIDTH + i];
810 dev_dbg(&ts->client->dev, "i=%d x=%d y=%d p=%d w=%d\n",
813 input_mt_slot(input, i);
814 input_mt_report_slot_state(input, MT_TOOL_FINGER, true);
815 input_event(input, EV_ABS, ABS_MT_POSITION_X, x);
816 input_event(input, EV_ABS, ABS_MT_POSITION_Y, y);
817 input_event(input, EV_ABS, ABS_MT_PRESSURE, p);
818 input_event(input, EV_ABS, ABS_MT_TOUCH_MAJOR, w);
826 input_mt_sync_frame(input);
830 static u8 elants_i2c_calculate_checksum(u8 *buf)
835 for (i = 0; i < FW_POS_CHECKSUM; i++)
841 static void elants_i2c_event(struct elants_data *ts, u8 *buf)
843 u8 checksum = elants_i2c_calculate_checksum(buf);
845 if (unlikely(buf[FW_POS_CHECKSUM] != checksum))
846 dev_warn(&ts->client->dev,
847 "%s: invalid checksum for packet %02x: %02x vs. %02x\n",
848 __func__, buf[FW_POS_HEADER],
849 checksum, buf[FW_POS_CHECKSUM]);
850 else if (unlikely(buf[FW_POS_HEADER] != HEADER_REPORT_10_FINGER))
851 dev_warn(&ts->client->dev,
852 "%s: unknown packet type: %02x\n",
853 __func__, buf[FW_POS_HEADER]);
855 elants_i2c_mt_event(ts, buf);
858 static irqreturn_t elants_i2c_irq(int irq, void *_dev)
860 const u8 wait_packet[] = { 0x64, 0x64, 0x64, 0x64 };
861 struct elants_data *ts = _dev;
862 struct i2c_client *client = ts->client;
863 int report_count, report_len;
867 len = i2c_master_recv(client, ts->buf, sizeof(ts->buf));
869 dev_err(&client->dev, "%s: failed to read data: %d\n",
874 dev_dbg(&client->dev, "%s: packet %*ph\n",
875 __func__, HEADER_SIZE, ts->buf);
878 case ELAN_WAIT_RECALIBRATION:
879 if (ts->buf[FW_HDR_TYPE] == CMD_HEADER_REK) {
880 memcpy(ts->cmd_resp, ts->buf, sizeof(ts->cmd_resp));
881 complete(&ts->cmd_done);
882 ts->state = ELAN_STATE_NORMAL;
886 case ELAN_WAIT_QUEUE_HEADER:
887 if (ts->buf[FW_HDR_TYPE] != QUEUE_HEADER_NORMAL)
890 ts->state = ELAN_STATE_NORMAL;
893 case ELAN_STATE_NORMAL:
895 switch (ts->buf[FW_HDR_TYPE]) {
896 case CMD_HEADER_HELLO:
897 case CMD_HEADER_RESP:
901 case QUEUE_HEADER_WAIT:
902 if (memcmp(ts->buf, wait_packet, sizeof(wait_packet))) {
903 dev_err(&client->dev,
904 "invalid wait packet %*ph\n",
905 HEADER_SIZE, ts->buf);
907 ts->state = ELAN_WAIT_QUEUE_HEADER;
912 case QUEUE_HEADER_SINGLE:
913 elants_i2c_event(ts, &ts->buf[HEADER_SIZE]);
916 case QUEUE_HEADER_NORMAL:
917 report_count = ts->buf[FW_HDR_COUNT];
918 if (report_count == 0 || report_count > 3) {
919 dev_err(&client->dev,
920 "bad report count: %*ph\n",
921 HEADER_SIZE, ts->buf);
925 report_len = ts->buf[FW_HDR_LENGTH] / report_count;
926 if (report_len != PACKET_SIZE) {
927 dev_err(&client->dev,
928 "mismatching report length: %*ph\n",
929 HEADER_SIZE, ts->buf);
933 for (i = 0; i < report_count; i++) {
934 u8 *buf = ts->buf + HEADER_SIZE +
936 elants_i2c_event(ts, buf);
941 dev_err(&client->dev, "unknown packet %*ph\n",
942 HEADER_SIZE, ts->buf);
955 static ssize_t calibrate_store(struct device *dev,
956 struct device_attribute *attr,
957 const char *buf, size_t count)
959 struct i2c_client *client = to_i2c_client(dev);
960 struct elants_data *ts = i2c_get_clientdata(client);
963 error = mutex_lock_interruptible(&ts->sysfs_mutex);
967 error = elants_i2c_calibrate(ts);
969 mutex_unlock(&ts->sysfs_mutex);
970 return error ?: count;
973 static ssize_t write_update_fw(struct device *dev,
974 struct device_attribute *attr,
975 const char *buf, size_t count)
977 struct i2c_client *client = to_i2c_client(dev);
978 struct elants_data *ts = i2c_get_clientdata(client);
981 error = mutex_lock_interruptible(&ts->sysfs_mutex);
985 error = elants_i2c_fw_update(ts);
986 dev_dbg(dev, "firmware update result: %d\n", error);
988 mutex_unlock(&ts->sysfs_mutex);
989 return error ?: count;
992 static ssize_t show_iap_mode(struct device *dev,
993 struct device_attribute *attr, char *buf)
995 struct i2c_client *client = to_i2c_client(dev);
996 struct elants_data *ts = i2c_get_clientdata(client);
998 return sprintf(buf, "%s\n",
999 ts->iap_mode == ELAN_IAP_OPERATIONAL ?
1000 "Normal" : "Recovery");
1003 static DEVICE_ATTR(calibrate, S_IWUSR, NULL, calibrate_store);
1004 static DEVICE_ATTR(iap_mode, S_IRUGO, show_iap_mode, NULL);
1005 static DEVICE_ATTR(update_fw, S_IWUSR, NULL, write_update_fw);
1007 struct elants_version_attribute {
1008 struct device_attribute dattr;
1009 size_t field_offset;
1013 #define __ELANTS_FIELD_SIZE(_field) \
1014 sizeof(((struct elants_data *)NULL)->_field)
1015 #define __ELANTS_VERIFY_SIZE(_field) \
1016 (BUILD_BUG_ON_ZERO(__ELANTS_FIELD_SIZE(_field) > 2) + \
1017 __ELANTS_FIELD_SIZE(_field))
1018 #define ELANTS_VERSION_ATTR(_field) \
1019 struct elants_version_attribute elants_ver_attr_##_field = { \
1020 .dattr = __ATTR(_field, S_IRUGO, \
1021 elants_version_attribute_show, NULL), \
1022 .field_offset = offsetof(struct elants_data, _field), \
1023 .field_size = __ELANTS_VERIFY_SIZE(_field), \
1026 static ssize_t elants_version_attribute_show(struct device *dev,
1027 struct device_attribute *dattr,
1030 struct i2c_client *client = to_i2c_client(dev);
1031 struct elants_data *ts = i2c_get_clientdata(client);
1032 struct elants_version_attribute *attr =
1033 container_of(dattr, struct elants_version_attribute, dattr);
1034 u8 *field = (u8 *)((char *)ts + attr->field_offset);
1035 unsigned int fmt_size;
1038 if (attr->field_size == 1) {
1040 fmt_size = 2; /* 2 HEX digits */
1042 val = *(u16 *)field;
1043 fmt_size = 4; /* 4 HEX digits */
1046 return sprintf(buf, "%0*x\n", fmt_size, val);
1049 static ELANTS_VERSION_ATTR(fw_version);
1050 static ELANTS_VERSION_ATTR(hw_version);
1051 static ELANTS_VERSION_ATTR(test_version);
1052 static ELANTS_VERSION_ATTR(solution_version);
1053 static ELANTS_VERSION_ATTR(bc_version);
1054 static ELANTS_VERSION_ATTR(iap_version);
1056 static struct attribute *elants_attributes[] = {
1057 &dev_attr_calibrate.attr,
1058 &dev_attr_update_fw.attr,
1059 &dev_attr_iap_mode.attr,
1061 &elants_ver_attr_fw_version.dattr.attr,
1062 &elants_ver_attr_hw_version.dattr.attr,
1063 &elants_ver_attr_test_version.dattr.attr,
1064 &elants_ver_attr_solution_version.dattr.attr,
1065 &elants_ver_attr_bc_version.dattr.attr,
1066 &elants_ver_attr_iap_version.dattr.attr,
1070 static const struct attribute_group elants_attribute_group = {
1071 .attrs = elants_attributes,
1074 static void elants_i2c_remove_sysfs_group(void *_data)
1076 struct elants_data *ts = _data;
1078 sysfs_remove_group(&ts->client->dev.kobj, &elants_attribute_group);
1081 static int elants_i2c_power_on(struct elants_data *ts)
1086 * If we do not have reset gpio assume platform firmware
1087 * controls regulators and does power them on for us.
1089 if (IS_ERR_OR_NULL(ts->reset_gpio))
1092 gpiod_set_value_cansleep(ts->reset_gpio, 1);
1094 error = regulator_enable(ts->vcc33);
1096 dev_err(&ts->client->dev,
1097 "failed to enable vcc33 regulator: %d\n",
1099 goto release_reset_gpio;
1102 error = regulator_enable(ts->vccio);
1104 dev_err(&ts->client->dev,
1105 "failed to enable vccio regulator: %d\n",
1107 regulator_disable(ts->vcc33);
1108 goto release_reset_gpio;
1112 * We need to wait a bit after powering on controller before
1113 * we are allowed to release reset GPIO.
1115 udelay(ELAN_POWERON_DELAY_USEC);
1118 gpiod_set_value_cansleep(ts->reset_gpio, 0);
1122 msleep(ELAN_RESET_DELAY_MSEC);
1127 static void elants_i2c_power_off(void *_data)
1129 struct elants_data *ts = _data;
1131 if (!IS_ERR_OR_NULL(ts->reset_gpio)) {
1133 * Activate reset gpio to prevent leakage through the
1134 * pin once we shut off power to the controller.
1136 gpiod_set_value_cansleep(ts->reset_gpio, 1);
1137 regulator_disable(ts->vccio);
1138 regulator_disable(ts->vcc33);
1143 static const struct acpi_device_id i2c_hid_ids[] = {
1149 static const guid_t i2c_hid_guid =
1150 GUID_INIT(0x3CDFF6F7, 0x4267, 0x4555,
1151 0xAD, 0x05, 0xB3, 0x0A, 0x3D, 0x89, 0x38, 0xDE);
1153 static bool elants_acpi_is_hid_device(struct device *dev)
1155 acpi_handle handle = ACPI_HANDLE(dev);
1156 union acpi_object *obj;
1158 if (acpi_match_device_ids(ACPI_COMPANION(dev), i2c_hid_ids))
1161 obj = acpi_evaluate_dsm_typed(handle, &i2c_hid_guid, 1, 1, NULL, ACPI_TYPE_INTEGER);
1170 static bool elants_acpi_is_hid_device(struct device *dev)
1176 static int elants_i2c_probe(struct i2c_client *client,
1177 const struct i2c_device_id *id)
1179 union i2c_smbus_data dummy;
1180 struct elants_data *ts;
1181 unsigned long irqflags;
1184 /* Don't bind to i2c-hid compatible devices, these are handled by the i2c-hid drv. */
1185 if (elants_acpi_is_hid_device(&client->dev)) {
1186 dev_warn(&client->dev, "This device appears to be an I2C-HID device, not binding\n");
1190 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
1191 dev_err(&client->dev, "I2C check functionality error\n");
1195 ts = devm_kzalloc(&client->dev, sizeof(struct elants_data), GFP_KERNEL);
1199 mutex_init(&ts->sysfs_mutex);
1200 init_completion(&ts->cmd_done);
1202 ts->client = client;
1203 i2c_set_clientdata(client, ts);
1205 ts->vcc33 = devm_regulator_get(&client->dev, "vcc33");
1206 if (IS_ERR(ts->vcc33)) {
1207 error = PTR_ERR(ts->vcc33);
1208 if (error != -EPROBE_DEFER)
1209 dev_err(&client->dev,
1210 "Failed to get 'vcc33' regulator: %d\n",
1215 ts->vccio = devm_regulator_get(&client->dev, "vccio");
1216 if (IS_ERR(ts->vccio)) {
1217 error = PTR_ERR(ts->vccio);
1218 if (error != -EPROBE_DEFER)
1219 dev_err(&client->dev,
1220 "Failed to get 'vccio' regulator: %d\n",
1225 ts->reset_gpio = devm_gpiod_get(&client->dev, "reset", GPIOD_OUT_LOW);
1226 if (IS_ERR(ts->reset_gpio)) {
1227 error = PTR_ERR(ts->reset_gpio);
1229 if (error == -EPROBE_DEFER)
1232 if (error != -ENOENT && error != -ENOSYS) {
1233 dev_err(&client->dev,
1234 "failed to get reset gpio: %d\n",
1239 ts->keep_power_in_suspend = true;
1242 error = elants_i2c_power_on(ts);
1246 error = devm_add_action(&client->dev, elants_i2c_power_off, ts);
1248 dev_err(&client->dev,
1249 "failed to install power off action: %d\n", error);
1250 elants_i2c_power_off(ts);
1254 /* Make sure there is something at this address */
1255 if (i2c_smbus_xfer(client->adapter, client->addr, 0,
1256 I2C_SMBUS_READ, 0, I2C_SMBUS_BYTE, &dummy) < 0) {
1257 dev_err(&client->dev, "nothing at this address\n");
1261 error = elants_i2c_initialize(ts);
1263 dev_err(&client->dev, "failed to initialize: %d\n", error);
1267 ts->input = devm_input_allocate_device(&client->dev);
1269 dev_err(&client->dev, "Failed to allocate input device\n");
1273 ts->input->name = "Elan Touchscreen";
1274 ts->input->id.bustype = BUS_I2C;
1276 __set_bit(BTN_TOUCH, ts->input->keybit);
1277 __set_bit(EV_ABS, ts->input->evbit);
1278 __set_bit(EV_KEY, ts->input->evbit);
1280 /* Single touch input params setup */
1281 input_set_abs_params(ts->input, ABS_X, 0, ts->x_max, 0, 0);
1282 input_set_abs_params(ts->input, ABS_Y, 0, ts->y_max, 0, 0);
1283 input_set_abs_params(ts->input, ABS_PRESSURE, 0, 255, 0, 0);
1284 input_abs_set_res(ts->input, ABS_X, ts->x_res);
1285 input_abs_set_res(ts->input, ABS_Y, ts->y_res);
1287 /* Multitouch input params setup */
1288 error = input_mt_init_slots(ts->input, MAX_CONTACT_NUM,
1289 INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED);
1291 dev_err(&client->dev,
1292 "failed to initialize MT slots: %d\n", error);
1296 input_set_abs_params(ts->input, ABS_MT_POSITION_X, 0, ts->x_max, 0, 0);
1297 input_set_abs_params(ts->input, ABS_MT_POSITION_Y, 0, ts->y_max, 0, 0);
1298 input_set_abs_params(ts->input, ABS_MT_TOUCH_MAJOR, 0, 255, 0, 0);
1299 input_set_abs_params(ts->input, ABS_MT_PRESSURE, 0, 255, 0, 0);
1300 input_abs_set_res(ts->input, ABS_MT_POSITION_X, ts->x_res);
1301 input_abs_set_res(ts->input, ABS_MT_POSITION_Y, ts->y_res);
1303 error = input_register_device(ts->input);
1305 dev_err(&client->dev,
1306 "unable to register input device: %d\n", error);
1311 * Systems using device tree should set up interrupt via DTS,
1312 * the rest will use the default falling edge interrupts.
1314 irqflags = client->dev.of_node ? 0 : IRQF_TRIGGER_FALLING;
1316 error = devm_request_threaded_irq(&client->dev, client->irq,
1317 NULL, elants_i2c_irq,
1318 irqflags | IRQF_ONESHOT,
1321 dev_err(&client->dev, "Failed to register interrupt\n");
1326 * Systems using device tree should set up wakeup via DTS,
1327 * the rest will configure device as wakeup source by default.
1329 if (!client->dev.of_node)
1330 device_init_wakeup(&client->dev, true);
1332 error = sysfs_create_group(&client->dev.kobj, &elants_attribute_group);
1334 dev_err(&client->dev, "failed to create sysfs attributes: %d\n",
1339 error = devm_add_action(&client->dev,
1340 elants_i2c_remove_sysfs_group, ts);
1342 elants_i2c_remove_sysfs_group(ts);
1343 dev_err(&client->dev,
1344 "Failed to add sysfs cleanup action: %d\n",
1352 static int __maybe_unused elants_i2c_suspend(struct device *dev)
1354 struct i2c_client *client = to_i2c_client(dev);
1355 struct elants_data *ts = i2c_get_clientdata(client);
1356 const u8 set_sleep_cmd[] = { 0x54, 0x50, 0x00, 0x01 };
1360 /* Command not support in IAP recovery mode */
1361 if (ts->iap_mode != ELAN_IAP_OPERATIONAL)
1364 disable_irq(client->irq);
1366 if (device_may_wakeup(dev)) {
1368 * The device will automatically enter idle mode
1369 * that has reduced power consumption.
1371 ts->wake_irq_enabled = (enable_irq_wake(client->irq) == 0);
1372 } else if (ts->keep_power_in_suspend) {
1373 for (retry_cnt = 0; retry_cnt < MAX_RETRIES; retry_cnt++) {
1374 error = elants_i2c_send(client, set_sleep_cmd,
1375 sizeof(set_sleep_cmd));
1379 dev_err(&client->dev,
1380 "suspend command failed: %d\n", error);
1383 elants_i2c_power_off(ts);
1389 static int __maybe_unused elants_i2c_resume(struct device *dev)
1391 struct i2c_client *client = to_i2c_client(dev);
1392 struct elants_data *ts = i2c_get_clientdata(client);
1393 const u8 set_active_cmd[] = { 0x54, 0x58, 0x00, 0x01 };
1397 if (device_may_wakeup(dev)) {
1398 if (ts->wake_irq_enabled)
1399 disable_irq_wake(client->irq);
1400 elants_i2c_sw_reset(client);
1401 } else if (ts->keep_power_in_suspend) {
1402 for (retry_cnt = 0; retry_cnt < MAX_RETRIES; retry_cnt++) {
1403 error = elants_i2c_send(client, set_active_cmd,
1404 sizeof(set_active_cmd));
1408 dev_err(&client->dev,
1409 "resume command failed: %d\n", error);
1412 elants_i2c_power_on(ts);
1413 elants_i2c_initialize(ts);
1416 ts->state = ELAN_STATE_NORMAL;
1417 enable_irq(client->irq);
1422 static SIMPLE_DEV_PM_OPS(elants_i2c_pm_ops,
1423 elants_i2c_suspend, elants_i2c_resume);
1425 static const struct i2c_device_id elants_i2c_id[] = {
1429 MODULE_DEVICE_TABLE(i2c, elants_i2c_id);
1432 static const struct acpi_device_id elants_acpi_id[] = {
1436 MODULE_DEVICE_TABLE(acpi, elants_acpi_id);
1440 static const struct of_device_id elants_of_match[] = {
1441 { .compatible = "elan,ekth3500" },
1444 MODULE_DEVICE_TABLE(of, elants_of_match);
1447 static struct i2c_driver elants_i2c_driver = {
1448 .probe = elants_i2c_probe,
1449 .id_table = elants_i2c_id,
1451 .name = DEVICE_NAME,
1452 .pm = &elants_i2c_pm_ops,
1453 .acpi_match_table = ACPI_PTR(elants_acpi_id),
1454 .of_match_table = of_match_ptr(elants_of_match),
1455 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
1458 module_i2c_driver(elants_i2c_driver);
1460 MODULE_AUTHOR("Scott Liu <scott.liu@emc.com.tw>");
1461 MODULE_DESCRIPTION("Elan I2c Touchscreen driver");
1462 MODULE_VERSION(DRV_VERSION);
1463 MODULE_LICENSE("GPL");