1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3  * Elantech Touchpad driver (v6)
4  *
5  * Copyright (C) 2007-2009 Arjan Opmeer <arjan@opmeer.net>
6  *
7  * Trademarks are the property of their respective owners.
8  */
9 
10 #ifndef _ELANTECH_H
11 #define _ELANTECH_H
12 
13 /*
14  * Command values for Synaptics style queries
15  */
16 #define ETP_FW_ID_QUERY			0x00
17 #define ETP_FW_VERSION_QUERY		0x01
18 #define ETP_CAPABILITIES_QUERY		0x02
19 #define ETP_SAMPLE_QUERY		0x03
20 #define ETP_RESOLUTION_QUERY		0x04
21 #define ETP_ICBODY_QUERY		0x05
22 
23 /*
24  * Command values for register reading or writing
25  */
26 #define ETP_REGISTER_READ		0x10
27 #define ETP_REGISTER_WRITE		0x11
28 #define ETP_REGISTER_READWRITE		0x00
29 
30 /*
31  * Hardware version 2 custom PS/2 command value
32  */
33 #define ETP_PS2_CUSTOM_COMMAND		0xf8
34 
35 /*
36  * Times to retry a ps2_command and millisecond delay between tries
37  */
38 #define ETP_PS2_COMMAND_TRIES		3
39 #define ETP_PS2_COMMAND_DELAY		500
40 
41 /*
42  * Times to try to read back a register and millisecond delay between tries
43  */
44 #define ETP_READ_BACK_TRIES		5
45 #define ETP_READ_BACK_DELAY		2000
46 
47 /*
48  * Register bitmasks for hardware version 1
49  */
50 #define ETP_R10_ABSOLUTE_MODE		0x04
51 #define ETP_R11_4_BYTE_MODE		0x02
52 
53 /*
54  * Capability bitmasks
55  */
56 #define ETP_CAP_HAS_ROCKER		0x04
57 
58 /*
59  * One hard to find application note states that X axis range is 0 to 576
60  * and Y axis range is 0 to 384 for harware version 1.
61  * Edge fuzz might be necessary because of bezel around the touchpad
62  */
63 #define ETP_EDGE_FUZZ_V1		32
64 
65 #define ETP_XMIN_V1			(  0 + ETP_EDGE_FUZZ_V1)
66 #define ETP_XMAX_V1			(576 - ETP_EDGE_FUZZ_V1)
67 #define ETP_YMIN_V1			(  0 + ETP_EDGE_FUZZ_V1)
68 #define ETP_YMAX_V1			(384 - ETP_EDGE_FUZZ_V1)
69 
70 /*
71  * The resolution for older v2 hardware doubled.
72  * (newer v2's firmware provides command so we can query)
73  */
74 #define ETP_XMIN_V2			0
75 #define ETP_XMAX_V2			1152
76 #define ETP_YMIN_V2			0
77 #define ETP_YMAX_V2			768
78 
79 #define ETP_PMIN_V2			0
80 #define ETP_PMAX_V2			255
81 #define ETP_WMIN_V2			0
82 #define ETP_WMAX_V2			15
83 
84 /*
85  * v3 hardware has 2 kinds of packet types,
86  * v4 hardware has 3.
87  */
88 #define PACKET_UNKNOWN			0x01
89 #define PACKET_DEBOUNCE			0x02
90 #define PACKET_V3_HEAD			0x03
91 #define PACKET_V3_TAIL			0x04
92 #define PACKET_V4_HEAD			0x05
93 #define PACKET_V4_MOTION		0x06
94 #define PACKET_V4_STATUS		0x07
95 #define PACKET_TRACKPOINT		0x08
96 
97 /*
98  * track up to 5 fingers for v4 hardware
99  */
100 #define ETP_MAX_FINGERS			5
101 
102 /*
103  * weight value for v4 hardware
104  */
105 #define ETP_WEIGHT_VALUE		5
106 
107 /*
108  * Bus information on 3rd byte of query ETP_RESOLUTION_QUERY(0x04)
109  */
110 #define ETP_BUS_PS2_ONLY		0
111 #define ETP_BUS_SMB_ALERT_ONLY		1
112 #define ETP_BUS_SMB_HST_NTFY_ONLY	2
113 #define ETP_BUS_PS2_SMB_ALERT		3
114 #define ETP_BUS_PS2_SMB_HST_NTFY	4
115 
116 /*
117  * New ICs are either using SMBus Host Notify or just plain PS2.
118  *
119  * ETP_FW_VERSION_QUERY is:
120  * Byte 1:
121  *  - bit 0..3: IC BODY
122  * Byte 2:
123  *  - bit 4: HiddenButton
124  *  - bit 5: PS2_SMBUS_NOTIFY
125  *  - bit 6: PS2CRCCheck
126  */
127 #define ETP_NEW_IC_SMBUS_HOST_NOTIFY(fw_version)	\
128 		((((fw_version) & 0x0f2000) == 0x0f2000) && \
129 		 ((fw_version) & 0x0000ff) > 0)
130 
131 /*
132  * The base position for one finger, v4 hardware
133  */
134 struct finger_pos {
135 	unsigned int x;
136 	unsigned int y;
137 };
138 
139 struct elantech_device_info {
140 	unsigned char capabilities[3];
141 	unsigned char samples[3];
142 	unsigned char debug;
143 	unsigned char hw_version;
144 	unsigned char pattern;
145 	unsigned int fw_version;
146 	unsigned int ic_version;
147 	unsigned int product_id;
148 	unsigned int x_min;
149 	unsigned int y_min;
150 	unsigned int x_max;
151 	unsigned int y_max;
152 	unsigned int x_res;
153 	unsigned int y_res;
154 	unsigned int x_traces;
155 	unsigned int y_traces;
156 	unsigned int width;
157 	unsigned int bus;
158 	bool paritycheck;
159 	bool jumpy_cursor;
160 	bool reports_pressure;
161 	bool crc_enabled;
162 	bool set_hw_resolution;
163 	bool has_trackpoint;
164 	bool has_middle_button;
165 	int (*send_cmd)(struct psmouse *psmouse, unsigned char c,
166 			unsigned char *param);
167 };
168 
169 struct elantech_data {
170 	struct input_dev *tp_dev;	/* Relative device for trackpoint */
171 	char tp_phys[32];
172 	unsigned char reg_07;
173 	unsigned char reg_10;
174 	unsigned char reg_11;
175 	unsigned char reg_20;
176 	unsigned char reg_21;
177 	unsigned char reg_22;
178 	unsigned char reg_23;
179 	unsigned char reg_24;
180 	unsigned char reg_25;
181 	unsigned char reg_26;
182 	unsigned int single_finger_reports;
183 	unsigned int y_max;
184 	unsigned int width;
185 	struct finger_pos mt[ETP_MAX_FINGERS];
186 	unsigned char parity[256];
187 	struct elantech_device_info info;
188 	void (*original_set_rate)(struct psmouse *psmouse, unsigned int rate);
189 };
190 
191 int elantech_detect(struct psmouse *psmouse, bool set_properties);
192 int elantech_init_ps2(struct psmouse *psmouse);
193 
194 #ifdef CONFIG_MOUSE_PS2_ELANTECH
195 int elantech_init(struct psmouse *psmouse);
196 #else
elantech_init(struct psmouse * psmouse)197 static inline int elantech_init(struct psmouse *psmouse)
198 {
199 	return -ENOSYS;
200 }
201 #endif /* CONFIG_MOUSE_PS2_ELANTECH */
202 
203 int elantech_init_smbus(struct psmouse *psmouse);
204 
205 #endif
206