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)  * Driver for I2C connected EETI EXC3000 multiple touch controller
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * Copyright (C) 2017 Ahmet Inan <inan@distec.de>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  * minimal implementation based on egalax_ts.c and egalax_i2c.c
^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) #include <linux/bitops.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <linux/delay.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/gpio/consumer.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/i2c.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/input.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <linux/input/mt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <linux/input/touchscreen.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <linux/interrupt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #include <linux/of.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) #include <linux/sizes.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) #include <linux/timer.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) #include <asm/unaligned.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) #define EXC3000_NUM_SLOTS		10
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) #define EXC3000_SLOTS_PER_FRAME		5
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) #define EXC3000_LEN_FRAME		66
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) #define EXC3000_LEN_POINT		10
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) #define EXC3000_LEN_MODEL_NAME		16
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) #define EXC3000_LEN_FW_VERSION		16
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) #define EXC3000_MT1_EVENT		0x06
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) #define EXC3000_MT2_EVENT		0x18
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) #define EXC3000_TIMEOUT_MS		100
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) #define EXC3000_RESET_MS		10
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) #define EXC3000_READY_MS		100
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) static const struct i2c_device_id exc3000_id[];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) struct eeti_dev_info {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 	const char *name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 	int max_xy;
^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) enum eeti_dev_id {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 	EETI_EXC3000,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 	EETI_EXC80H60,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 	EETI_EXC80H84,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) static struct eeti_dev_info exc3000_info[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 	[EETI_EXC3000] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 		.name = "EETI EXC3000 Touch Screen",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 		.max_xy = SZ_4K - 1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 	},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 	[EETI_EXC80H60] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 		.name = "EETI EXC80H60 Touch Screen",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 		.max_xy = SZ_16K - 1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 	},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 	[EETI_EXC80H84] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 		.name = "EETI EXC80H84 Touch Screen",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 		.max_xy = SZ_16K - 1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 	},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) struct exc3000_data {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 	struct i2c_client *client;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 	const struct eeti_dev_info *info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	struct input_dev *input;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 	struct touchscreen_properties prop;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 	struct gpio_desc *reset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 	struct timer_list timer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 	u8 buf[2 * EXC3000_LEN_FRAME];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 	struct completion wait_event;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 	struct mutex query_lock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 	int query_result;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 	char model[EXC3000_LEN_MODEL_NAME];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 	char fw_version[EXC3000_LEN_FW_VERSION];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) static void exc3000_report_slots(struct input_dev *input,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 				 struct touchscreen_properties *prop,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 				 const u8 *buf, int num)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 	for (; num--; buf += EXC3000_LEN_POINT) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 		if (buf[0] & BIT(0)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 			input_mt_slot(input, buf[1]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 			input_mt_report_slot_state(input, MT_TOOL_FINGER, true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 			touchscreen_report_pos(input, prop,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 					       get_unaligned_le16(buf + 2),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 					       get_unaligned_le16(buf + 4),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 					       true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) static void exc3000_timer(struct timer_list *t)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 	struct exc3000_data *data = from_timer(data, t, timer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 	input_mt_sync_frame(data->input);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 	input_sync(data->input);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) static int exc3000_read_frame(struct exc3000_data *data, u8 *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 	struct i2c_client *client = data->client;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 	u8 expected_event = EXC3000_MT1_EVENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 	if (data->info->max_xy == SZ_16K - 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 		expected_event = EXC3000_MT2_EVENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 	ret = i2c_master_send(client, "'", 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 	if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 	if (ret != 2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 		return -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 	ret = i2c_master_recv(client, buf, EXC3000_LEN_FRAME);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 	if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 	if (ret != EXC3000_LEN_FRAME)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 		return -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 	if (get_unaligned_le16(buf) != EXC3000_LEN_FRAME)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 	if (buf[2] != expected_event)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) static int exc3000_read_data(struct exc3000_data *data,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 			     u8 *buf, int *n_slots)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 	int error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 	error = exc3000_read_frame(data, buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 	if (error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 		return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 	*n_slots = buf[3];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 	if (!*n_slots || *n_slots > EXC3000_NUM_SLOTS)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 	if (*n_slots > EXC3000_SLOTS_PER_FRAME) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 		/* Read 2nd frame to get the rest of the contacts. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 		error = exc3000_read_frame(data, buf + EXC3000_LEN_FRAME);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 		if (error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 			return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 		/* 2nd chunk must have number of contacts set to 0. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 		if (buf[EXC3000_LEN_FRAME + 3] != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 			return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) static int exc3000_query_interrupt(struct exc3000_data *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 	u8 *buf = data->buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 	int error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 	error = i2c_master_recv(data->client, buf, EXC3000_LEN_FRAME);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 	if (error < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 		return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 	if (buf[0] != 'B')
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 		return -EPROTO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 	if (buf[4] == 'E')
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 		strlcpy(data->model, buf + 5, sizeof(data->model));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 	else if (buf[4] == 'D')
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 		strlcpy(data->fw_version, buf + 5, sizeof(data->fw_version));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 		return -EPROTO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) static irqreturn_t exc3000_interrupt(int irq, void *dev_id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 	struct exc3000_data *data = dev_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 	struct input_dev *input = data->input;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 	u8 *buf = data->buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 	int slots, total_slots;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 	int error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 	if (mutex_is_locked(&data->query_lock)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 		data->query_result = exc3000_query_interrupt(data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 		complete(&data->wait_event);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 	error = exc3000_read_data(data, buf, &total_slots);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 	if (error) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 		/* Schedule a timer to release "stuck" contacts */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 		mod_timer(&data->timer,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 			  jiffies + msecs_to_jiffies(EXC3000_TIMEOUT_MS));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 	 * We read full state successfully, no contacts will be "stuck".
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 	del_timer_sync(&data->timer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 	while (total_slots > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 		slots = min(total_slots, EXC3000_SLOTS_PER_FRAME);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 		exc3000_report_slots(input, &data->prop, buf + 4, slots);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 		total_slots -= slots;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 		buf += EXC3000_LEN_FRAME;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 	input_mt_sync_frame(input);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 	input_sync(input);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 	return IRQ_HANDLED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) static ssize_t fw_version_show(struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 			       struct device_attribute *attr, char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 	struct i2c_client *client = to_i2c_client(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 	struct exc3000_data *data = i2c_get_clientdata(client);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 	static const u8 request[68] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 		0x67, 0x00, 0x42, 0x00, 0x03, 0x01, 'D', 0x00
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 	};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 	int error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 	mutex_lock(&data->query_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 	data->query_result = -ETIMEDOUT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 	reinit_completion(&data->wait_event);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 	error = i2c_master_send(client, request, sizeof(request));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 	if (error < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 		mutex_unlock(&data->query_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 		return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 	wait_for_completion_interruptible_timeout(&data->wait_event, 1 * HZ);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 	mutex_unlock(&data->query_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 	if (data->query_result < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 		return data->query_result;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 	return sprintf(buf, "%s\n", data->fw_version);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) static DEVICE_ATTR_RO(fw_version);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) static ssize_t exc3000_get_model(struct exc3000_data *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 	static const u8 request[68] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 		0x67, 0x00, 0x42, 0x00, 0x03, 0x01, 'E', 0x00
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 	};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 	struct i2c_client *client = data->client;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 	int error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 	mutex_lock(&data->query_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 	data->query_result = -ETIMEDOUT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 	reinit_completion(&data->wait_event);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 	error = i2c_master_send(client, request, sizeof(request));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 	if (error < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 		mutex_unlock(&data->query_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 		return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 	wait_for_completion_interruptible_timeout(&data->wait_event, 1 * HZ);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 	mutex_unlock(&data->query_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 	return data->query_result;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) static ssize_t model_show(struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 			  struct device_attribute *attr, char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 	struct i2c_client *client = to_i2c_client(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 	struct exc3000_data *data = i2c_get_clientdata(client);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 	int error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 	error = exc3000_get_model(data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 	if (error < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 		return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 	return sprintf(buf, "%s\n", data->model);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) static DEVICE_ATTR_RO(model);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) static struct attribute *sysfs_attrs[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 	&dev_attr_fw_version.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 	&dev_attr_model.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 	NULL
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) static struct attribute_group exc3000_attribute_group = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 	.attrs = sysfs_attrs
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) static int exc3000_probe(struct i2c_client *client)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) 	struct exc3000_data *data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 	struct input_dev *input;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 	int error, max_xy, retry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 	data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 	if (!data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 	data->client = client;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) 	data->info = device_get_match_data(&client->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 	if (!data->info) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) 		enum eeti_dev_id eeti_dev_id =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) 			i2c_match_id(exc3000_id, client)->driver_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) 		data->info = &exc3000_info[eeti_dev_id];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) 	timer_setup(&data->timer, exc3000_timer, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) 	init_completion(&data->wait_event);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) 	mutex_init(&data->query_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) 	data->reset = devm_gpiod_get_optional(&client->dev, "reset",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) 					      GPIOD_OUT_HIGH);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) 	if (IS_ERR(data->reset))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) 		return PTR_ERR(data->reset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) 	if (data->reset) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) 		msleep(EXC3000_RESET_MS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) 		gpiod_set_value_cansleep(data->reset, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) 		msleep(EXC3000_READY_MS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) 	input = devm_input_allocate_device(&client->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) 	if (!input)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) 	data->input = input;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) 	input_set_drvdata(input, data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) 	input->name = data->info->name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) 	input->id.bustype = BUS_I2C;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) 	max_xy = data->info->max_xy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) 	input_set_abs_params(input, ABS_MT_POSITION_X, 0, max_xy, 0, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) 	input_set_abs_params(input, ABS_MT_POSITION_Y, 0, max_xy, 0, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) 	touchscreen_parse_properties(input, true, &data->prop);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) 	error = input_mt_init_slots(input, EXC3000_NUM_SLOTS,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) 				    INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) 	if (error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) 		return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) 	error = input_register_device(input);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) 	if (error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) 		return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) 	error = devm_request_threaded_irq(&client->dev, client->irq,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) 					  NULL, exc3000_interrupt, IRQF_ONESHOT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) 					  client->name, data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) 	if (error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) 		return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) 	 * I²C does not have built-in recovery, so retry on failure. This
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) 	 * ensures, that the device probe will not fail for temporary issues
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) 	 * on the bus.  This is not needed for the sysfs calls (userspace
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) 	 * will receive the error code and can start another query) and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) 	 * cannot be done for touch events (but that only means loosing one
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) 	 * or two touch events anyways).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) 	for (retry = 0; retry < 3; retry++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) 		error = exc3000_get_model(data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) 		if (!error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) 		dev_warn(&client->dev, "Retry %d get EETI EXC3000 model: %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) 			 retry + 1, error);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) 	if (error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) 		return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) 	dev_dbg(&client->dev, "TS Model: %s", data->model);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) 	i2c_set_clientdata(client, data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) 	error = devm_device_add_group(&client->dev, &exc3000_attribute_group);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) 	if (error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) 		return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) static const struct i2c_device_id exc3000_id[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) 	{ "exc3000", EETI_EXC3000 },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) 	{ "exc80h60", EETI_EXC80H60 },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) 	{ "exc80h84", EETI_EXC80H84 },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) 	{ }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) MODULE_DEVICE_TABLE(i2c, exc3000_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) #ifdef CONFIG_OF
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) static const struct of_device_id exc3000_of_match[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) 	{ .compatible = "eeti,exc3000", .data = &exc3000_info[EETI_EXC3000] },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) 	{ .compatible = "eeti,exc80h60", .data = &exc3000_info[EETI_EXC80H60] },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) 	{ .compatible = "eeti,exc80h84", .data = &exc3000_info[EETI_EXC80H84] },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) 	{ }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) MODULE_DEVICE_TABLE(of, exc3000_of_match);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) static struct i2c_driver exc3000_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) 	.driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) 		.name	= "exc3000",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) 		.of_match_table = of_match_ptr(exc3000_of_match),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) 	},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) 	.id_table	= exc3000_id,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) 	.probe_new	= exc3000_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) module_i2c_driver(exc3000_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) MODULE_AUTHOR("Ahmet Inan <inan@distec.de>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) MODULE_DESCRIPTION("I2C connected EETI EXC3000 multiple touch controller driver");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) MODULE_LICENSE("GPL v2");