Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * Elo serial touchscreen driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * Copyright (c) 2004 Vojtech Pavlik
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10)  * This driver can handle serial Elo touchscreens using either the Elo standard
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11)  * 'E271-2210' 10-byte protocol, Elo legacy 'E281A-4002' 6-byte protocol, Elo
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12)  * legacy 'E271-140' 4-byte protocol and Elo legacy 'E261-280' 3-byte protocol.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #include <linux/input.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #include <linux/serio.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) #include <linux/ctype.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) #define DRIVER_DESC	"Elo serial touchscreen driver"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) MODULE_DESCRIPTION(DRIVER_DESC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30)  * Definitions & global arrays.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) #define ELO_MAX_LENGTH		10
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) #define ELO10_PACKET_LEN	8
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) #define ELO10_TOUCH		0x03
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) #define ELO10_PRESSURE		0x80
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) #define ELO10_LEAD_BYTE		'U'
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) #define ELO10_ID_CMD		'i'
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) #define ELO10_TOUCH_PACKET	'T'
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) #define ELO10_ACK_PACKET	'A'
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) #define ELI10_ID_PACKET		'I'
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48)  * Per-touchscreen data.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) struct elo {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 	struct input_dev *dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 	struct serio *serio;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 	struct mutex cmd_mutex;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 	struct completion cmd_done;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 	int id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 	int idx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 	unsigned char expected_packet;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 	unsigned char csum;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 	unsigned char data[ELO_MAX_LENGTH];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 	unsigned char response[ELO10_PACKET_LEN];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 	char phys[32];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) static void elo_process_data_10(struct elo *elo, unsigned char data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 	struct input_dev *dev = elo->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 	elo->data[elo->idx] = data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 	switch (elo->idx++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	case 0:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 		elo->csum = 0xaa;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 		if (data != ELO10_LEAD_BYTE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 			dev_dbg(&elo->serio->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 				"unsynchronized data: 0x%02x\n", data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 			elo->idx = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 	case 9:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 		elo->idx = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 		if (data != elo->csum) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 			dev_dbg(&elo->serio->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 				"bad checksum: 0x%02x, expected 0x%02x\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 				 data, elo->csum);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 		if (elo->data[1] != elo->expected_packet) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 			if (elo->data[1] != ELO10_TOUCH_PACKET)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 				dev_dbg(&elo->serio->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 					"unexpected packet: 0x%02x\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 					 elo->data[1]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 		if (likely(elo->data[1] == ELO10_TOUCH_PACKET)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 			input_report_abs(dev, ABS_X, (elo->data[4] << 8) | elo->data[3]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 			input_report_abs(dev, ABS_Y, (elo->data[6] << 8) | elo->data[5]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 			if (elo->data[2] & ELO10_PRESSURE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 				input_report_abs(dev, ABS_PRESSURE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 						(elo->data[8] << 8) | elo->data[7]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 			input_report_key(dev, BTN_TOUCH, elo->data[2] & ELO10_TOUCH);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 			input_sync(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 		} else if (elo->data[1] == ELO10_ACK_PACKET) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 			if (elo->data[2] == '0')
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 				elo->expected_packet = ELO10_TOUCH_PACKET;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 			complete(&elo->cmd_done);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 		} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 			memcpy(elo->response, &elo->data[1], ELO10_PACKET_LEN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 			elo->expected_packet = ELO10_ACK_PACKET;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 	elo->csum += data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) static void elo_process_data_6(struct elo *elo, unsigned char data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 	struct input_dev *dev = elo->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 	elo->data[elo->idx] = data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 	switch (elo->idx++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 	case 0:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 		if ((data & 0xc0) != 0xc0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 			elo->idx = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 	case 1:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 		if ((data & 0xc0) != 0x80)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 			elo->idx = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 	case 2:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 		if ((data & 0xc0) != 0x40)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 			elo->idx = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 	case 3:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 		if (data & 0xc0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 			elo->idx = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 		input_report_abs(dev, ABS_X, ((elo->data[0] & 0x3f) << 6) | (elo->data[1] & 0x3f));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 		input_report_abs(dev, ABS_Y, ((elo->data[2] & 0x3f) << 6) | (elo->data[3] & 0x3f));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 		if (elo->id == 2) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 			input_report_key(dev, BTN_TOUCH, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 			input_sync(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 			elo->idx = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 	case 4:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 		if (data) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 			input_sync(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 			elo->idx = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 	case 5:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 		if ((data & 0xf0) == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 			input_report_abs(dev, ABS_PRESSURE, elo->data[5]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 			input_report_key(dev, BTN_TOUCH, !!elo->data[5]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 		input_sync(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 		elo->idx = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) static void elo_process_data_3(struct elo *elo, unsigned char data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 	struct input_dev *dev = elo->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 	elo->data[elo->idx] = data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 	switch (elo->idx++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 	case 0:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 		if ((data & 0x7f) != 0x01)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 			elo->idx = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 	case 2:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 		input_report_key(dev, BTN_TOUCH, !(elo->data[1] & 0x80));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 		input_report_abs(dev, ABS_X, elo->data[1]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 		input_report_abs(dev, ABS_Y, elo->data[2]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 		input_sync(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 		elo->idx = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) static irqreturn_t elo_interrupt(struct serio *serio,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 		unsigned char data, unsigned int flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 	struct elo *elo = serio_get_drvdata(serio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 	switch (elo->id) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 	case 0:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 		elo_process_data_10(elo, data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 	case 1:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 	case 2:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 		elo_process_data_6(elo, data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 	case 3:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 		elo_process_data_3(elo, data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 	return IRQ_HANDLED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) static int elo_command_10(struct elo *elo, unsigned char *packet)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 	int rc = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 	int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 	unsigned char csum = 0xaa + ELO10_LEAD_BYTE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 	mutex_lock(&elo->cmd_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 	serio_pause_rx(elo->serio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 	elo->expected_packet = toupper(packet[0]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 	init_completion(&elo->cmd_done);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 	serio_continue_rx(elo->serio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 	if (serio_write(elo->serio, ELO10_LEAD_BYTE))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 	for (i = 0; i < ELO10_PACKET_LEN; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 		csum += packet[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 		if (serio_write(elo->serio, packet[i]))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 			goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 	if (serio_write(elo->serio, csum))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 	wait_for_completion_timeout(&elo->cmd_done, HZ);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 	if (elo->expected_packet == ELO10_TOUCH_PACKET) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 		/* We are back in reporting mode, the command was ACKed */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 		memcpy(packet, elo->response, ELO10_PACKET_LEN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 		rc = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253)  out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 	mutex_unlock(&elo->cmd_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 	return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) static int elo_setup_10(struct elo *elo)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 	static const char *elo_types[] = { "Accu", "Dura", "Intelli", "Carroll" };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 	struct input_dev *dev = elo->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 	unsigned char packet[ELO10_PACKET_LEN] = { ELO10_ID_CMD };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 	if (elo_command_10(elo, packet))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 		return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 	dev->id.version = (packet[5] << 8) | packet[4];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 	input_set_abs_params(dev, ABS_X, 96, 4000, 0, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 	input_set_abs_params(dev, ABS_Y, 96, 4000, 0, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 	if (packet[3] & ELO10_PRESSURE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 		input_set_abs_params(dev, ABS_PRESSURE, 0, 255, 0, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 	dev_info(&elo->serio->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 		 "%sTouch touchscreen, fw: %02x.%02x, features: 0x%02x, controller: 0x%02x\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 		 elo_types[(packet[1] -'0') & 0x03],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 		 packet[5], packet[4], packet[3], packet[7]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283)  * elo_disconnect() is the opposite of elo_connect()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) static void elo_disconnect(struct serio *serio)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 	struct elo *elo = serio_get_drvdata(serio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 	input_get_device(elo->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 	input_unregister_device(elo->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 	serio_close(serio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 	serio_set_drvdata(serio, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 	input_put_device(elo->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 	kfree(elo);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299)  * elo_connect() is the routine that is called when someone adds a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300)  * new serio device that supports Gunze protocol and registers it as
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301)  * an input device.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) static int elo_connect(struct serio *serio, struct serio_driver *drv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 	struct elo *elo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 	struct input_dev *input_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 	int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 	elo = kzalloc(sizeof(struct elo), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) 	input_dev = input_allocate_device();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) 	if (!elo || !input_dev) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 		err = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 		goto fail1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 	elo->serio = serio;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 	elo->id = serio->id.id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 	elo->dev = input_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 	elo->expected_packet = ELO10_TOUCH_PACKET;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) 	mutex_init(&elo->cmd_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 	init_completion(&elo->cmd_done);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) 	snprintf(elo->phys, sizeof(elo->phys), "%s/input0", serio->phys);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) 	input_dev->name = "Elo Serial TouchScreen";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) 	input_dev->phys = elo->phys;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) 	input_dev->id.bustype = BUS_RS232;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) 	input_dev->id.vendor = SERIO_ELO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) 	input_dev->id.product = elo->id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) 	input_dev->id.version = 0x0100;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) 	input_dev->dev.parent = &serio->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) 	input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) 	input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) 	serio_set_drvdata(serio, elo);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) 	err = serio_open(serio, drv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) 	if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) 		goto fail2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) 	switch (elo->id) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) 	case 0: /* 10-byte protocol */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) 		if (elo_setup_10(elo)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) 			err = -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) 			goto fail3;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) 	case 1: /* 6-byte protocol */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) 		input_set_abs_params(input_dev, ABS_PRESSURE, 0, 15, 0, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) 		fallthrough;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) 	case 2: /* 4-byte protocol */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) 		input_set_abs_params(input_dev, ABS_X, 96, 4000, 0, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) 		input_set_abs_params(input_dev, ABS_Y, 96, 4000, 0, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) 	case 3: /* 3-byte protocol */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) 		input_set_abs_params(input_dev, ABS_X, 0, 255, 0, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) 		input_set_abs_params(input_dev, ABS_Y, 0, 255, 0, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) 	err = input_register_device(elo->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) 	if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) 		goto fail3;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372)  fail3: serio_close(serio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373)  fail2:	serio_set_drvdata(serio, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374)  fail1:	input_free_device(input_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) 	kfree(elo);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) 	return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380)  * The serio driver structure.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) static const struct serio_device_id elo_serio_ids[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) 	{
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) 		.type	= SERIO_RS232,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) 		.proto	= SERIO_ELO,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) 		.id	= SERIO_ANY,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) 		.extra	= SERIO_ANY,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) 	},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) 	{ 0 }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) MODULE_DEVICE_TABLE(serio, elo_serio_ids);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) static struct serio_driver elo_drv = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) 	.driver		= {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) 		.name	= "elo",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) 	},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) 	.description	= DRIVER_DESC,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) 	.id_table	= elo_serio_ids,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) 	.interrupt	= elo_interrupt,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) 	.connect	= elo_connect,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) 	.disconnect	= elo_disconnect,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) module_serio_driver(elo_drv);