12874c5fdSThomas Gleixner // SPDX-License-Identifier: GPL-2.0-or-later
29a6a4193SAlexandrov Stansilav /*
39a6a4193SAlexandrov Stansilav * HID Driver for ELAN Touchpad
49a6a4193SAlexandrov Stansilav *
59a6a4193SAlexandrov Stansilav * Currently only supports touchpad found on HP Pavilion X2 10
69a6a4193SAlexandrov Stansilav *
79a6a4193SAlexandrov Stansilav * Copyright (c) 2016 Alexandrov Stanislav <neko@nya.ai>
89a6a4193SAlexandrov Stansilav */
99a6a4193SAlexandrov Stansilav
109a6a4193SAlexandrov Stansilav #include <linux/hid.h>
119a6a4193SAlexandrov Stansilav #include <linux/input/mt.h>
129a6a4193SAlexandrov Stansilav #include <linux/leds.h>
139a6a4193SAlexandrov Stansilav #include <linux/module.h>
149a6a4193SAlexandrov Stansilav #include <linux/usb.h>
159a6a4193SAlexandrov Stansilav
169a6a4193SAlexandrov Stansilav #include "hid-ids.h"
179a6a4193SAlexandrov Stansilav
18e7ad3dc9SHans de Goede #define ELAN_MT_I2C 0x5d
199a6a4193SAlexandrov Stansilav #define ELAN_SINGLE_FINGER 0x81
209a6a4193SAlexandrov Stansilav #define ELAN_MT_FIRST_FINGER 0x82
219a6a4193SAlexandrov Stansilav #define ELAN_MT_SECOND_FINGER 0x83
229a6a4193SAlexandrov Stansilav #define ELAN_INPUT_REPORT_SIZE 8
23e7ad3dc9SHans de Goede #define ELAN_I2C_REPORT_SIZE 32
24e7ad3dc9SHans de Goede #define ELAN_FINGER_DATA_LEN 5
25314f04e8SHans de Goede #define ELAN_MAX_FINGERS 5
262f612de2SHans de Goede #define ELAN_MAX_PRESSURE 255
27314f04e8SHans de Goede #define ELAN_TP_USB_INTF 1
289a6a4193SAlexandrov Stansilav
2979d11f2aSHans de Goede #define ELAN_FEATURE_REPORT 0x0d
3079d11f2aSHans de Goede #define ELAN_FEATURE_SIZE 5
3179d11f2aSHans de Goede #define ELAN_PARAM_MAX_X 6
3279d11f2aSHans de Goede #define ELAN_PARAM_MAX_Y 7
3379d11f2aSHans de Goede #define ELAN_PARAM_RES 8
3479d11f2aSHans de Goede
359a6a4193SAlexandrov Stansilav #define ELAN_MUTE_LED_REPORT 0xBC
369a6a4193SAlexandrov Stansilav #define ELAN_LED_REPORT_SIZE 8
379a6a4193SAlexandrov Stansilav
387ed3f281SHans de Goede #define ELAN_HAS_LED BIT(0)
397ed3f281SHans de Goede
409a6a4193SAlexandrov Stansilav struct elan_drvdata {
419a6a4193SAlexandrov Stansilav struct input_dev *input;
429a6a4193SAlexandrov Stansilav u8 prev_report[ELAN_INPUT_REPORT_SIZE];
439a6a4193SAlexandrov Stansilav struct led_classdev mute_led;
449a6a4193SAlexandrov Stansilav u8 mute_led_state;
4579d11f2aSHans de Goede u16 max_x;
4679d11f2aSHans de Goede u16 max_y;
4719588beeSHans de Goede u16 res_x;
4819588beeSHans de Goede u16 res_y;
499a6a4193SAlexandrov Stansilav };
509a6a4193SAlexandrov Stansilav
is_not_elan_touchpad(struct hid_device * hdev)519a6a4193SAlexandrov Stansilav static int is_not_elan_touchpad(struct hid_device *hdev)
529a6a4193SAlexandrov Stansilav {
53*93020953SGreg Kroah-Hartman if (hid_is_usb(hdev)) {
549a6a4193SAlexandrov Stansilav struct usb_interface *intf = to_usb_interface(hdev->dev.parent);
559a6a4193SAlexandrov Stansilav
56e7ad3dc9SHans de Goede return (intf->altsetting->desc.bInterfaceNumber !=
57e7ad3dc9SHans de Goede ELAN_TP_USB_INTF);
58e7ad3dc9SHans de Goede }
59e7ad3dc9SHans de Goede
60e7ad3dc9SHans de Goede return 0;
619a6a4193SAlexandrov Stansilav }
629a6a4193SAlexandrov Stansilav
elan_input_mapping(struct hid_device * hdev,struct hid_input * hi,struct hid_field * field,struct hid_usage * usage,unsigned long ** bit,int * max)639a6a4193SAlexandrov Stansilav static int elan_input_mapping(struct hid_device *hdev, struct hid_input *hi,
649a6a4193SAlexandrov Stansilav struct hid_field *field, struct hid_usage *usage,
659a6a4193SAlexandrov Stansilav unsigned long **bit, int *max)
669a6a4193SAlexandrov Stansilav {
679a6a4193SAlexandrov Stansilav if (is_not_elan_touchpad(hdev))
689a6a4193SAlexandrov Stansilav return 0;
699a6a4193SAlexandrov Stansilav
709a6a4193SAlexandrov Stansilav if (field->report->id == ELAN_SINGLE_FINGER ||
719a6a4193SAlexandrov Stansilav field->report->id == ELAN_MT_FIRST_FINGER ||
72e7ad3dc9SHans de Goede field->report->id == ELAN_MT_SECOND_FINGER ||
73e7ad3dc9SHans de Goede field->report->id == ELAN_MT_I2C)
749a6a4193SAlexandrov Stansilav return -1;
759a6a4193SAlexandrov Stansilav
769a6a4193SAlexandrov Stansilav return 0;
779a6a4193SAlexandrov Stansilav }
789a6a4193SAlexandrov Stansilav
elan_get_device_param(struct hid_device * hdev,unsigned char * dmabuf,unsigned char param)7979d11f2aSHans de Goede static int elan_get_device_param(struct hid_device *hdev,
8079d11f2aSHans de Goede unsigned char *dmabuf, unsigned char param)
8179d11f2aSHans de Goede {
8279d11f2aSHans de Goede int ret;
8379d11f2aSHans de Goede
8479d11f2aSHans de Goede dmabuf[0] = ELAN_FEATURE_REPORT;
8579d11f2aSHans de Goede dmabuf[1] = 0x05;
8679d11f2aSHans de Goede dmabuf[2] = 0x03;
8779d11f2aSHans de Goede dmabuf[3] = param;
8879d11f2aSHans de Goede dmabuf[4] = 0x01;
8979d11f2aSHans de Goede
9079d11f2aSHans de Goede ret = hid_hw_raw_request(hdev, ELAN_FEATURE_REPORT, dmabuf,
9179d11f2aSHans de Goede ELAN_FEATURE_SIZE, HID_FEATURE_REPORT,
9279d11f2aSHans de Goede HID_REQ_SET_REPORT);
9379d11f2aSHans de Goede if (ret != ELAN_FEATURE_SIZE) {
9479d11f2aSHans de Goede hid_err(hdev, "Set report error for parm %d: %d\n", param, ret);
9579d11f2aSHans de Goede return ret;
9679d11f2aSHans de Goede }
9779d11f2aSHans de Goede
9879d11f2aSHans de Goede ret = hid_hw_raw_request(hdev, ELAN_FEATURE_REPORT, dmabuf,
9979d11f2aSHans de Goede ELAN_FEATURE_SIZE, HID_FEATURE_REPORT,
10079d11f2aSHans de Goede HID_REQ_GET_REPORT);
10179d11f2aSHans de Goede if (ret != ELAN_FEATURE_SIZE) {
10279d11f2aSHans de Goede hid_err(hdev, "Get report error for parm %d: %d\n", param, ret);
10379d11f2aSHans de Goede return ret;
10479d11f2aSHans de Goede }
10579d11f2aSHans de Goede
10679d11f2aSHans de Goede return 0;
10779d11f2aSHans de Goede }
10879d11f2aSHans de Goede
elan_convert_res(char val)10919588beeSHans de Goede static unsigned int elan_convert_res(char val)
11019588beeSHans de Goede {
11119588beeSHans de Goede /*
11219588beeSHans de Goede * (value from firmware) * 10 + 790 = dpi
11319588beeSHans de Goede * dpi * 10 / 254 = dots/mm
11419588beeSHans de Goede */
11519588beeSHans de Goede return (val * 10 + 790) * 10 / 254;
11619588beeSHans de Goede }
11719588beeSHans de Goede
elan_get_device_params(struct hid_device * hdev)11879d11f2aSHans de Goede static int elan_get_device_params(struct hid_device *hdev)
11979d11f2aSHans de Goede {
12079d11f2aSHans de Goede struct elan_drvdata *drvdata = hid_get_drvdata(hdev);
12179d11f2aSHans de Goede unsigned char *dmabuf;
12279d11f2aSHans de Goede int ret;
12379d11f2aSHans de Goede
12479d11f2aSHans de Goede dmabuf = kmalloc(ELAN_FEATURE_SIZE, GFP_KERNEL);
12579d11f2aSHans de Goede if (!dmabuf)
12679d11f2aSHans de Goede return -ENOMEM;
12779d11f2aSHans de Goede
12879d11f2aSHans de Goede ret = elan_get_device_param(hdev, dmabuf, ELAN_PARAM_MAX_X);
12979d11f2aSHans de Goede if (ret)
13079d11f2aSHans de Goede goto err;
13179d11f2aSHans de Goede
13279d11f2aSHans de Goede drvdata->max_x = (dmabuf[4] << 8) | dmabuf[3];
13379d11f2aSHans de Goede
13479d11f2aSHans de Goede ret = elan_get_device_param(hdev, dmabuf, ELAN_PARAM_MAX_Y);
13579d11f2aSHans de Goede if (ret)
13679d11f2aSHans de Goede goto err;
13779d11f2aSHans de Goede
13879d11f2aSHans de Goede drvdata->max_y = (dmabuf[4] << 8) | dmabuf[3];
13979d11f2aSHans de Goede
14019588beeSHans de Goede ret = elan_get_device_param(hdev, dmabuf, ELAN_PARAM_RES);
14119588beeSHans de Goede if (ret)
14219588beeSHans de Goede goto err;
14319588beeSHans de Goede
14419588beeSHans de Goede drvdata->res_x = elan_convert_res(dmabuf[3]);
14519588beeSHans de Goede drvdata->res_y = elan_convert_res(dmabuf[4]);
14619588beeSHans de Goede
14779d11f2aSHans de Goede err:
14879d11f2aSHans de Goede kfree(dmabuf);
14979d11f2aSHans de Goede return ret;
15079d11f2aSHans de Goede }
15179d11f2aSHans de Goede
elan_input_configured(struct hid_device * hdev,struct hid_input * hi)1529a6a4193SAlexandrov Stansilav static int elan_input_configured(struct hid_device *hdev, struct hid_input *hi)
1539a6a4193SAlexandrov Stansilav {
1549a6a4193SAlexandrov Stansilav int ret;
1559a6a4193SAlexandrov Stansilav struct input_dev *input;
1569a6a4193SAlexandrov Stansilav struct elan_drvdata *drvdata = hid_get_drvdata(hdev);
1579a6a4193SAlexandrov Stansilav
1589a6a4193SAlexandrov Stansilav if (is_not_elan_touchpad(hdev))
1599a6a4193SAlexandrov Stansilav return 0;
1609a6a4193SAlexandrov Stansilav
16179d11f2aSHans de Goede ret = elan_get_device_params(hdev);
16279d11f2aSHans de Goede if (ret)
16379d11f2aSHans de Goede return ret;
16479d11f2aSHans de Goede
1659a6a4193SAlexandrov Stansilav input = devm_input_allocate_device(&hdev->dev);
1669a6a4193SAlexandrov Stansilav if (!input)
1679a6a4193SAlexandrov Stansilav return -ENOMEM;
1689a6a4193SAlexandrov Stansilav
1699a6a4193SAlexandrov Stansilav input->name = "Elan Touchpad";
1709a6a4193SAlexandrov Stansilav input->phys = hdev->phys;
1719a6a4193SAlexandrov Stansilav input->uniq = hdev->uniq;
1729a6a4193SAlexandrov Stansilav input->id.bustype = hdev->bus;
1739a6a4193SAlexandrov Stansilav input->id.vendor = hdev->vendor;
1749a6a4193SAlexandrov Stansilav input->id.product = hdev->product;
1759a6a4193SAlexandrov Stansilav input->id.version = hdev->version;
1769a6a4193SAlexandrov Stansilav input->dev.parent = &hdev->dev;
1779a6a4193SAlexandrov Stansilav
17879d11f2aSHans de Goede input_set_abs_params(input, ABS_MT_POSITION_X, 0, drvdata->max_x,
17979d11f2aSHans de Goede 0, 0);
18079d11f2aSHans de Goede input_set_abs_params(input, ABS_MT_POSITION_Y, 0, drvdata->max_y,
18179d11f2aSHans de Goede 0, 0);
1822f612de2SHans de Goede input_set_abs_params(input, ABS_MT_PRESSURE, 0, ELAN_MAX_PRESSURE,
1832f612de2SHans de Goede 0, 0);
1849a6a4193SAlexandrov Stansilav
1859a6a4193SAlexandrov Stansilav __set_bit(BTN_LEFT, input->keybit);
1869a6a4193SAlexandrov Stansilav __set_bit(INPUT_PROP_BUTTONPAD, input->propbit);
1879a6a4193SAlexandrov Stansilav
188314f04e8SHans de Goede ret = input_mt_init_slots(input, ELAN_MAX_FINGERS, INPUT_MT_POINTER);
1899a6a4193SAlexandrov Stansilav if (ret) {
1909a6a4193SAlexandrov Stansilav hid_err(hdev, "Failed to init elan MT slots: %d\n", ret);
1919a6a4193SAlexandrov Stansilav return ret;
1929a6a4193SAlexandrov Stansilav }
1939a6a4193SAlexandrov Stansilav
19419588beeSHans de Goede input_abs_set_res(input, ABS_X, drvdata->res_x);
19519588beeSHans de Goede input_abs_set_res(input, ABS_Y, drvdata->res_y);
19619588beeSHans de Goede
1979a6a4193SAlexandrov Stansilav ret = input_register_device(input);
1989a6a4193SAlexandrov Stansilav if (ret) {
1999a6a4193SAlexandrov Stansilav hid_err(hdev, "Failed to register elan input device: %d\n",
2009a6a4193SAlexandrov Stansilav ret);
201b7429ea5SDinghao Liu input_mt_destroy_slots(input);
2029a6a4193SAlexandrov Stansilav return ret;
2039a6a4193SAlexandrov Stansilav }
2049a6a4193SAlexandrov Stansilav
2059a6a4193SAlexandrov Stansilav drvdata->input = input;
2069a6a4193SAlexandrov Stansilav
2079a6a4193SAlexandrov Stansilav return 0;
2089a6a4193SAlexandrov Stansilav }
2099a6a4193SAlexandrov Stansilav
elan_report_mt_slot(struct elan_drvdata * drvdata,u8 * data,unsigned int slot_num)2109a6a4193SAlexandrov Stansilav static void elan_report_mt_slot(struct elan_drvdata *drvdata, u8 *data,
2119a6a4193SAlexandrov Stansilav unsigned int slot_num)
2129a6a4193SAlexandrov Stansilav {
2139a6a4193SAlexandrov Stansilav struct input_dev *input = drvdata->input;
2142f612de2SHans de Goede int x, y, p;
2159a6a4193SAlexandrov Stansilav
2169a6a4193SAlexandrov Stansilav bool active = !!data;
2179a6a4193SAlexandrov Stansilav
2189a6a4193SAlexandrov Stansilav input_mt_slot(input, slot_num);
2199a6a4193SAlexandrov Stansilav input_mt_report_slot_state(input, MT_TOOL_FINGER, active);
2209a6a4193SAlexandrov Stansilav if (active) {
2219a6a4193SAlexandrov Stansilav x = ((data[0] & 0xF0) << 4) | data[1];
22279d11f2aSHans de Goede y = drvdata->max_y -
2239a6a4193SAlexandrov Stansilav (((data[0] & 0x07) << 8) | data[2]);
2242f612de2SHans de Goede p = data[4];
2259a6a4193SAlexandrov Stansilav
2269a6a4193SAlexandrov Stansilav input_report_abs(input, ABS_MT_POSITION_X, x);
2279a6a4193SAlexandrov Stansilav input_report_abs(input, ABS_MT_POSITION_Y, y);
2282f612de2SHans de Goede input_report_abs(input, ABS_MT_PRESSURE, p);
2299a6a4193SAlexandrov Stansilav }
2309a6a4193SAlexandrov Stansilav }
2319a6a4193SAlexandrov Stansilav
elan_usb_report_input(struct elan_drvdata * drvdata,u8 * data)232e7ad3dc9SHans de Goede static void elan_usb_report_input(struct elan_drvdata *drvdata, u8 *data)
2339a6a4193SAlexandrov Stansilav {
2349a6a4193SAlexandrov Stansilav int i;
2359a6a4193SAlexandrov Stansilav struct input_dev *input = drvdata->input;
2369a6a4193SAlexandrov Stansilav
2379a6a4193SAlexandrov Stansilav /*
2389a6a4193SAlexandrov Stansilav * There is 3 types of reports: for single touch,
2399a6a4193SAlexandrov Stansilav * for multitouch - first finger and for multitouch - second finger
2409a6a4193SAlexandrov Stansilav *
2419a6a4193SAlexandrov Stansilav * packet structure for ELAN_SINGLE_FINGER and ELAN_MT_FIRST_FINGER:
2429a6a4193SAlexandrov Stansilav *
2439a6a4193SAlexandrov Stansilav * byte 1: 1 0 0 0 0 0 0 1 // 0x81 or 0x82
2449a6a4193SAlexandrov Stansilav * byte 2: 0 0 0 0 0 0 0 0 // looks like unused
2459a6a4193SAlexandrov Stansilav * byte 3: f5 f4 f3 f2 f1 0 0 L
2469a6a4193SAlexandrov Stansilav * byte 4: x12 x11 x10 x9 0? y11 y10 y9
2479a6a4193SAlexandrov Stansilav * byte 5: x8 x7 x6 x5 x4 x3 x2 x1
2489a6a4193SAlexandrov Stansilav * byte 6: y8 y7 y6 y5 y4 y3 y2 y1
2499a6a4193SAlexandrov Stansilav * byte 7: sy4 sy3 sy2 sy1 sx4 sx3 sx2 sx1
2502f612de2SHans de Goede * byte 8: p8 p7 p6 p5 p4 p3 p2 p1
2519a6a4193SAlexandrov Stansilav *
2529a6a4193SAlexandrov Stansilav * packet structure for ELAN_MT_SECOND_FINGER:
2539a6a4193SAlexandrov Stansilav *
2549a6a4193SAlexandrov Stansilav * byte 1: 1 0 0 0 0 0 1 1 // 0x83
2559a6a4193SAlexandrov Stansilav * byte 2: x12 x11 x10 x9 0 y11 y10 y9
2569a6a4193SAlexandrov Stansilav * byte 3: x8 x7 x6 x5 x4 x3 x2 x1
2579a6a4193SAlexandrov Stansilav * byte 4: y8 y7 y6 y5 y4 y3 y2 y1
2589a6a4193SAlexandrov Stansilav * byte 5: sy4 sy3 sy2 sy1 sx4 sx3 sx2 sx1
2592f612de2SHans de Goede * byte 6: p8 p7 p6 p5 p4 p3 p2 p1
2609a6a4193SAlexandrov Stansilav * byte 7: 0 0 0 0 0 0 0 0
2619a6a4193SAlexandrov Stansilav * byte 8: 0 0 0 0 0 0 0 0
2629a6a4193SAlexandrov Stansilav *
2639a6a4193SAlexandrov Stansilav * f5-f1: finger touch bits
2649a6a4193SAlexandrov Stansilav * L: clickpad button
2652f612de2SHans de Goede * sy / sx: finger width / height expressed in traces, the total number
2662f612de2SHans de Goede * of traces can be queried by doing a HID_REQ_SET_REPORT
2672f612de2SHans de Goede * { 0x0d, 0x05, 0x03, 0x05, 0x01 } followed by a GET, in the
2682f612de2SHans de Goede * returned buf, buf[3]=no-x-traces, buf[4]=no-y-traces.
2692f612de2SHans de Goede * p: pressure
2709a6a4193SAlexandrov Stansilav */
2719a6a4193SAlexandrov Stansilav
2729a6a4193SAlexandrov Stansilav if (data[0] == ELAN_SINGLE_FINGER) {
273314f04e8SHans de Goede for (i = 0; i < ELAN_MAX_FINGERS; i++) {
2749a6a4193SAlexandrov Stansilav if (data[2] & BIT(i + 3))
2759a6a4193SAlexandrov Stansilav elan_report_mt_slot(drvdata, data + 3, i);
2769a6a4193SAlexandrov Stansilav else
2779a6a4193SAlexandrov Stansilav elan_report_mt_slot(drvdata, NULL, i);
2789a6a4193SAlexandrov Stansilav }
2799a6a4193SAlexandrov Stansilav input_report_key(input, BTN_LEFT, data[2] & 0x01);
2809a6a4193SAlexandrov Stansilav }
2819a6a4193SAlexandrov Stansilav /*
2829a6a4193SAlexandrov Stansilav * When touched with two fingers Elan touchpad will emit two HID reports
2839a6a4193SAlexandrov Stansilav * first is ELAN_MT_FIRST_FINGER and second is ELAN_MT_SECOND_FINGER
2849a6a4193SAlexandrov Stansilav * we will save ELAN_MT_FIRST_FINGER report and wait for
2859a6a4193SAlexandrov Stansilav * ELAN_MT_SECOND_FINGER to finish multitouch
2869a6a4193SAlexandrov Stansilav */
2879a6a4193SAlexandrov Stansilav if (data[0] == ELAN_MT_FIRST_FINGER) {
2889a6a4193SAlexandrov Stansilav memcpy(drvdata->prev_report, data,
2899a6a4193SAlexandrov Stansilav sizeof(drvdata->prev_report));
2909a6a4193SAlexandrov Stansilav return;
2919a6a4193SAlexandrov Stansilav }
2929a6a4193SAlexandrov Stansilav
2939a6a4193SAlexandrov Stansilav if (data[0] == ELAN_MT_SECOND_FINGER) {
2949a6a4193SAlexandrov Stansilav int first = 0;
2959a6a4193SAlexandrov Stansilav u8 *prev_report = drvdata->prev_report;
2969a6a4193SAlexandrov Stansilav
2979a6a4193SAlexandrov Stansilav if (prev_report[0] != ELAN_MT_FIRST_FINGER)
2989a6a4193SAlexandrov Stansilav return;
2999a6a4193SAlexandrov Stansilav
300314f04e8SHans de Goede for (i = 0; i < ELAN_MAX_FINGERS; i++) {
3019a6a4193SAlexandrov Stansilav if (prev_report[2] & BIT(i + 3)) {
3029a6a4193SAlexandrov Stansilav if (!first) {
3039a6a4193SAlexandrov Stansilav first = 1;
3049a6a4193SAlexandrov Stansilav elan_report_mt_slot(drvdata, prev_report + 3, i);
3059a6a4193SAlexandrov Stansilav } else {
3069a6a4193SAlexandrov Stansilav elan_report_mt_slot(drvdata, data + 1, i);
3079a6a4193SAlexandrov Stansilav }
3089a6a4193SAlexandrov Stansilav } else {
3099a6a4193SAlexandrov Stansilav elan_report_mt_slot(drvdata, NULL, i);
3109a6a4193SAlexandrov Stansilav }
3119a6a4193SAlexandrov Stansilav }
3129a6a4193SAlexandrov Stansilav input_report_key(input, BTN_LEFT, prev_report[2] & 0x01);
3139a6a4193SAlexandrov Stansilav }
3149a6a4193SAlexandrov Stansilav
3159a6a4193SAlexandrov Stansilav input_mt_sync_frame(input);
3169a6a4193SAlexandrov Stansilav input_sync(input);
3179a6a4193SAlexandrov Stansilav }
3189a6a4193SAlexandrov Stansilav
elan_i2c_report_input(struct elan_drvdata * drvdata,u8 * data)319e7ad3dc9SHans de Goede static void elan_i2c_report_input(struct elan_drvdata *drvdata, u8 *data)
320e7ad3dc9SHans de Goede {
321e7ad3dc9SHans de Goede struct input_dev *input = drvdata->input;
322e7ad3dc9SHans de Goede u8 *finger_data;
323e7ad3dc9SHans de Goede int i;
324e7ad3dc9SHans de Goede
325e7ad3dc9SHans de Goede /*
326e7ad3dc9SHans de Goede * Elan MT touchpads in i2c mode send finger data in the same format
327e7ad3dc9SHans de Goede * as in USB mode, but then with all fingers in a single packet.
328e7ad3dc9SHans de Goede *
329e7ad3dc9SHans de Goede * packet structure for ELAN_MT_I2C:
330e7ad3dc9SHans de Goede *
331e7ad3dc9SHans de Goede * byte 1: 1 0 0 1 1 1 0 1 // 0x5d
332e7ad3dc9SHans de Goede * byte 2: f5 f4 f3 f2 f1 0 0 L
333e7ad3dc9SHans de Goede * byte 3: x12 x11 x10 x9 0? y11 y10 y9
334e7ad3dc9SHans de Goede * byte 4: x8 x7 x6 x5 x4 x3 x2 x1
335e7ad3dc9SHans de Goede * byte 5: y8 y7 y6 y5 y4 y3 y2 y1
336e7ad3dc9SHans de Goede * byte 6: sy4 sy3 sy2 sy1 sx4 sx3 sx2 sx1
337e7ad3dc9SHans de Goede * byte 7: p8 p7 p6 p5 p4 p3 p2 p1
338e7ad3dc9SHans de Goede * byte 8-12: Same as byte 3-7 for second finger down
339e7ad3dc9SHans de Goede * byte 13-17: Same as byte 3-7 for third finger down
340e7ad3dc9SHans de Goede * byte 18-22: Same as byte 3-7 for fourth finger down
341e7ad3dc9SHans de Goede * byte 23-27: Same as byte 3-7 for fifth finger down
342e7ad3dc9SHans de Goede */
343e7ad3dc9SHans de Goede
344e7ad3dc9SHans de Goede finger_data = data + 2;
345e7ad3dc9SHans de Goede for (i = 0; i < ELAN_MAX_FINGERS; i++) {
346e7ad3dc9SHans de Goede if (data[1] & BIT(i + 3)) {
347e7ad3dc9SHans de Goede elan_report_mt_slot(drvdata, finger_data, i);
348e7ad3dc9SHans de Goede finger_data += ELAN_FINGER_DATA_LEN;
349e7ad3dc9SHans de Goede } else {
350e7ad3dc9SHans de Goede elan_report_mt_slot(drvdata, NULL, i);
351e7ad3dc9SHans de Goede }
352e7ad3dc9SHans de Goede }
353e7ad3dc9SHans de Goede
354e7ad3dc9SHans de Goede input_report_key(input, BTN_LEFT, data[1] & 0x01);
355e7ad3dc9SHans de Goede input_mt_sync_frame(input);
356e7ad3dc9SHans de Goede input_sync(input);
357e7ad3dc9SHans de Goede }
358e7ad3dc9SHans de Goede
elan_raw_event(struct hid_device * hdev,struct hid_report * report,u8 * data,int size)3599a6a4193SAlexandrov Stansilav static int elan_raw_event(struct hid_device *hdev,
3609a6a4193SAlexandrov Stansilav struct hid_report *report, u8 *data, int size)
3619a6a4193SAlexandrov Stansilav {
3629a6a4193SAlexandrov Stansilav struct elan_drvdata *drvdata = hid_get_drvdata(hdev);
3639a6a4193SAlexandrov Stansilav
3649a6a4193SAlexandrov Stansilav if (is_not_elan_touchpad(hdev))
3659a6a4193SAlexandrov Stansilav return 0;
3669a6a4193SAlexandrov Stansilav
3679a6a4193SAlexandrov Stansilav if (data[0] == ELAN_SINGLE_FINGER ||
3689a6a4193SAlexandrov Stansilav data[0] == ELAN_MT_FIRST_FINGER ||
3699a6a4193SAlexandrov Stansilav data[0] == ELAN_MT_SECOND_FINGER) {
3709a6a4193SAlexandrov Stansilav if (size == ELAN_INPUT_REPORT_SIZE) {
371e7ad3dc9SHans de Goede elan_usb_report_input(drvdata, data);
3729a6a4193SAlexandrov Stansilav return 1;
3739a6a4193SAlexandrov Stansilav }
3749a6a4193SAlexandrov Stansilav }
3759a6a4193SAlexandrov Stansilav
376e7ad3dc9SHans de Goede if (data[0] == ELAN_MT_I2C && size == ELAN_I2C_REPORT_SIZE) {
377e7ad3dc9SHans de Goede elan_i2c_report_input(drvdata, data);
378e7ad3dc9SHans de Goede return 1;
379e7ad3dc9SHans de Goede }
380e7ad3dc9SHans de Goede
3819a6a4193SAlexandrov Stansilav return 0;
3829a6a4193SAlexandrov Stansilav }
3839a6a4193SAlexandrov Stansilav
elan_start_multitouch(struct hid_device * hdev)3849a6a4193SAlexandrov Stansilav static int elan_start_multitouch(struct hid_device *hdev)
3859a6a4193SAlexandrov Stansilav {
3869a6a4193SAlexandrov Stansilav int ret;
3879a6a4193SAlexandrov Stansilav
3889a6a4193SAlexandrov Stansilav /*
3899a6a4193SAlexandrov Stansilav * This byte sequence will enable multitouch mode and disable
3909a6a4193SAlexandrov Stansilav * mouse emulation
3919a6a4193SAlexandrov Stansilav */
3928471300fSColin Ian King static const unsigned char buf[] = { 0x0D, 0x00, 0x03, 0x21, 0x00 };
3939a6a4193SAlexandrov Stansilav unsigned char *dmabuf = kmemdup(buf, sizeof(buf), GFP_KERNEL);
3949a6a4193SAlexandrov Stansilav
3959a6a4193SAlexandrov Stansilav if (!dmabuf)
3969a6a4193SAlexandrov Stansilav return -ENOMEM;
3979a6a4193SAlexandrov Stansilav
3989a6a4193SAlexandrov Stansilav ret = hid_hw_raw_request(hdev, dmabuf[0], dmabuf, sizeof(buf),
3999a6a4193SAlexandrov Stansilav HID_FEATURE_REPORT, HID_REQ_SET_REPORT);
4009a6a4193SAlexandrov Stansilav
4019a6a4193SAlexandrov Stansilav kfree(dmabuf);
4029a6a4193SAlexandrov Stansilav
4039a6a4193SAlexandrov Stansilav if (ret != sizeof(buf)) {
4049a6a4193SAlexandrov Stansilav hid_err(hdev, "Failed to start multitouch: %d\n", ret);
4059a6a4193SAlexandrov Stansilav return ret;
4069a6a4193SAlexandrov Stansilav }
4079a6a4193SAlexandrov Stansilav
4089a6a4193SAlexandrov Stansilav return 0;
4099a6a4193SAlexandrov Stansilav }
4109a6a4193SAlexandrov Stansilav
elan_mute_led_set_brigtness(struct led_classdev * led_cdev,enum led_brightness value)4119a6a4193SAlexandrov Stansilav static int elan_mute_led_set_brigtness(struct led_classdev *led_cdev,
4129a6a4193SAlexandrov Stansilav enum led_brightness value)
4139a6a4193SAlexandrov Stansilav {
4149a6a4193SAlexandrov Stansilav int ret;
4159a6a4193SAlexandrov Stansilav u8 led_state;
4169a6a4193SAlexandrov Stansilav struct device *dev = led_cdev->dev->parent;
4179a6a4193SAlexandrov Stansilav struct hid_device *hdev = to_hid_device(dev);
4189a6a4193SAlexandrov Stansilav struct elan_drvdata *drvdata = hid_get_drvdata(hdev);
4199a6a4193SAlexandrov Stansilav
4209a6a4193SAlexandrov Stansilav unsigned char *dmabuf = kzalloc(ELAN_LED_REPORT_SIZE, GFP_KERNEL);
4219a6a4193SAlexandrov Stansilav
4229a6a4193SAlexandrov Stansilav if (!dmabuf)
4239a6a4193SAlexandrov Stansilav return -ENOMEM;
4249a6a4193SAlexandrov Stansilav
4259a6a4193SAlexandrov Stansilav led_state = !!value;
4269a6a4193SAlexandrov Stansilav
4279a6a4193SAlexandrov Stansilav dmabuf[0] = ELAN_MUTE_LED_REPORT;
4289a6a4193SAlexandrov Stansilav dmabuf[1] = 0x02;
4299a6a4193SAlexandrov Stansilav dmabuf[2] = led_state;
4309a6a4193SAlexandrov Stansilav
4319a6a4193SAlexandrov Stansilav ret = hid_hw_raw_request(hdev, dmabuf[0], dmabuf, ELAN_LED_REPORT_SIZE,
4329a6a4193SAlexandrov Stansilav HID_FEATURE_REPORT, HID_REQ_SET_REPORT);
4339a6a4193SAlexandrov Stansilav
4349a6a4193SAlexandrov Stansilav kfree(dmabuf);
4359a6a4193SAlexandrov Stansilav
4369a6a4193SAlexandrov Stansilav if (ret != ELAN_LED_REPORT_SIZE) {
437efb618fbSHans de Goede if (ret != -ENODEV)
4389a6a4193SAlexandrov Stansilav hid_err(hdev, "Failed to set mute led brightness: %d\n", ret);
439efb618fbSHans de Goede return ret < 0 ? ret : -EIO;
4409a6a4193SAlexandrov Stansilav }
4419a6a4193SAlexandrov Stansilav
4429a6a4193SAlexandrov Stansilav drvdata->mute_led_state = led_state;
4439a6a4193SAlexandrov Stansilav return 0;
4449a6a4193SAlexandrov Stansilav }
4459a6a4193SAlexandrov Stansilav
elan_init_mute_led(struct hid_device * hdev)4469a6a4193SAlexandrov Stansilav static int elan_init_mute_led(struct hid_device *hdev)
4479a6a4193SAlexandrov Stansilav {
4489a6a4193SAlexandrov Stansilav struct elan_drvdata *drvdata = hid_get_drvdata(hdev);
4499a6a4193SAlexandrov Stansilav struct led_classdev *mute_led = &drvdata->mute_led;
4509a6a4193SAlexandrov Stansilav
4519a6a4193SAlexandrov Stansilav mute_led->name = "elan:red:mute";
4522601371eSHans de Goede mute_led->default_trigger = "audio-mute";
4539a6a4193SAlexandrov Stansilav mute_led->brightness_set_blocking = elan_mute_led_set_brigtness;
4549a6a4193SAlexandrov Stansilav mute_led->max_brightness = LED_ON;
455efb618fbSHans de Goede mute_led->flags = LED_HW_PLUGGABLE;
4569a6a4193SAlexandrov Stansilav mute_led->dev = &hdev->dev;
4579a6a4193SAlexandrov Stansilav
4589a6a4193SAlexandrov Stansilav return devm_led_classdev_register(&hdev->dev, mute_led);
4599a6a4193SAlexandrov Stansilav }
4609a6a4193SAlexandrov Stansilav
elan_probe(struct hid_device * hdev,const struct hid_device_id * id)4619a6a4193SAlexandrov Stansilav static int elan_probe(struct hid_device *hdev, const struct hid_device_id *id)
4629a6a4193SAlexandrov Stansilav {
4639a6a4193SAlexandrov Stansilav int ret;
4649a6a4193SAlexandrov Stansilav struct elan_drvdata *drvdata;
4659a6a4193SAlexandrov Stansilav
4669a6a4193SAlexandrov Stansilav drvdata = devm_kzalloc(&hdev->dev, sizeof(*drvdata), GFP_KERNEL);
4679a6a4193SAlexandrov Stansilav
4689a6a4193SAlexandrov Stansilav if (!drvdata)
4699a6a4193SAlexandrov Stansilav return -ENOMEM;
4709a6a4193SAlexandrov Stansilav
4719a6a4193SAlexandrov Stansilav hid_set_drvdata(hdev, drvdata);
4729a6a4193SAlexandrov Stansilav
4739a6a4193SAlexandrov Stansilav ret = hid_parse(hdev);
4749a6a4193SAlexandrov Stansilav if (ret) {
4759a6a4193SAlexandrov Stansilav hid_err(hdev, "Hid Parse failed\n");
4769a6a4193SAlexandrov Stansilav return ret;
4779a6a4193SAlexandrov Stansilav }
4789a6a4193SAlexandrov Stansilav
4799a6a4193SAlexandrov Stansilav ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
4809a6a4193SAlexandrov Stansilav if (ret) {
4819a6a4193SAlexandrov Stansilav hid_err(hdev, "Hid hw start failed\n");
4829a6a4193SAlexandrov Stansilav return ret;
4839a6a4193SAlexandrov Stansilav }
4849a6a4193SAlexandrov Stansilav
4859a6a4193SAlexandrov Stansilav if (is_not_elan_touchpad(hdev))
4869a6a4193SAlexandrov Stansilav return 0;
4879a6a4193SAlexandrov Stansilav
4889a6a4193SAlexandrov Stansilav if (!drvdata->input) {
48914f39921SColin Ian King hid_err(hdev, "Input device is not registered\n");
4909a6a4193SAlexandrov Stansilav ret = -ENAVAIL;
4919a6a4193SAlexandrov Stansilav goto err;
4929a6a4193SAlexandrov Stansilav }
4939a6a4193SAlexandrov Stansilav
4949a6a4193SAlexandrov Stansilav ret = elan_start_multitouch(hdev);
4959a6a4193SAlexandrov Stansilav if (ret)
4969a6a4193SAlexandrov Stansilav goto err;
4979a6a4193SAlexandrov Stansilav
4987ed3f281SHans de Goede if (id->driver_data & ELAN_HAS_LED) {
4999a6a4193SAlexandrov Stansilav ret = elan_init_mute_led(hdev);
5009a6a4193SAlexandrov Stansilav if (ret)
5019a6a4193SAlexandrov Stansilav goto err;
5027ed3f281SHans de Goede }
5039a6a4193SAlexandrov Stansilav
5049a6a4193SAlexandrov Stansilav return 0;
5059a6a4193SAlexandrov Stansilav err:
5069a6a4193SAlexandrov Stansilav hid_hw_stop(hdev);
5079a6a4193SAlexandrov Stansilav return ret;
5089a6a4193SAlexandrov Stansilav }
5099a6a4193SAlexandrov Stansilav
5109a6a4193SAlexandrov Stansilav static const struct hid_device_id elan_devices[] = {
5116e5dd632SHans de Goede { HID_USB_DEVICE(USB_VENDOR_ID_ELAN, USB_DEVICE_ID_HP_X2),
5126e5dd632SHans de Goede .driver_data = ELAN_HAS_LED },
5137ed3f281SHans de Goede { HID_USB_DEVICE(USB_VENDOR_ID_ELAN, USB_DEVICE_ID_HP_X2_10_COVER),
5147ed3f281SHans de Goede .driver_data = ELAN_HAS_LED },
515e7ad3dc9SHans de Goede { HID_I2C_DEVICE(USB_VENDOR_ID_ELAN, USB_DEVICE_ID_TOSHIBA_CLICK_L9W) },
5169a6a4193SAlexandrov Stansilav { }
5179a6a4193SAlexandrov Stansilav };
5189a6a4193SAlexandrov Stansilav MODULE_DEVICE_TABLE(hid, elan_devices);
5199a6a4193SAlexandrov Stansilav
5209a6a4193SAlexandrov Stansilav static struct hid_driver elan_driver = {
5219a6a4193SAlexandrov Stansilav .name = "elan",
5229a6a4193SAlexandrov Stansilav .id_table = elan_devices,
5239a6a4193SAlexandrov Stansilav .input_mapping = elan_input_mapping,
5249a6a4193SAlexandrov Stansilav .input_configured = elan_input_configured,
5259a6a4193SAlexandrov Stansilav .raw_event = elan_raw_event,
5269a6a4193SAlexandrov Stansilav .probe = elan_probe,
5279a6a4193SAlexandrov Stansilav };
5289a6a4193SAlexandrov Stansilav
5299a6a4193SAlexandrov Stansilav module_hid_driver(elan_driver);
5309a6a4193SAlexandrov Stansilav
5319a6a4193SAlexandrov Stansilav MODULE_LICENSE("GPL");
5329a6a4193SAlexandrov Stansilav MODULE_AUTHOR("Alexandrov Stanislav");
5339a6a4193SAlexandrov Stansilav MODULE_DESCRIPTION("Driver for HID ELAN Touchpads");
534