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)  * Touch Screen driver for SiS 9200 family I2C Touch panels
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * Copyright (C) 2015 SiS, Inc.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  * Copyright (C) 2016 Nextfour Group
^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) #include <linux/crc-itu-t.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <linux/delay.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <linux/i2c.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/input.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/input/mt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/interrupt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/gpio/consumer.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <asm/unaligned.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #define SIS_I2C_NAME		"sis_i2c_ts"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23)  * The I2C packet format:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24)  * le16		byte count
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25)  * u8		Report ID
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26)  * <contact data - variable length>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27)  * u8		Number of contacts
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28)  * le16		Scan Time (optional)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29)  * le16		CRC
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31)  * One touch point information consists of 6+ bytes, the order is:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32)  * u8		contact state
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33)  * u8		finger id
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34)  * le16		x axis
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35)  * le16		y axis
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36)  * u8		contact width (optional)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37)  * u8		contact height (optional)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38)  * u8		pressure (optional)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40)  * Maximum amount of data transmitted in one shot is 64 bytes, if controller
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41)  * needs to report more contacts than fit in one packet it will send true
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42)  * number of contacts in first packet and 0 as number of contacts in second
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43)  * packet.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) #define SIS_MAX_PACKET_SIZE		64
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) #define SIS_PKT_LEN_OFFSET		0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) #define SIS_PKT_REPORT_OFFSET		2 /* Report ID/type */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) #define SIS_PKT_CONTACT_OFFSET		3 /* First contact */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) #define SIS_SCAN_TIME_LEN		2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) /* Supported report types */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) #define SIS_ALL_IN_ONE_PACKAGE		0x10
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) #define SIS_PKT_IS_TOUCH(x)		(((x) & 0x0f) == 0x01)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) #define SIS_PKT_IS_HIDI2C(x)		(((x) & 0x0f) == 0x06)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) /* Contact properties within report */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) #define SIS_PKT_HAS_AREA(x)		((x) & BIT(4))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) #define SIS_PKT_HAS_PRESSURE(x)		((x) & BIT(5))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) #define SIS_PKT_HAS_SCANTIME(x)		((x) & BIT(6))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) /* Contact size */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) #define SIS_BASE_LEN_PER_CONTACT	6
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) #define SIS_AREA_LEN_PER_CONTACT	2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) #define SIS_PRESSURE_LEN_PER_CONTACT	1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) /* Offsets within contact data */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) #define SIS_CONTACT_STATUS_OFFSET	0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) #define SIS_CONTACT_ID_OFFSET		1 /* Contact ID */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) #define SIS_CONTACT_X_OFFSET		2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) #define SIS_CONTACT_Y_OFFSET		4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) #define SIS_CONTACT_WIDTH_OFFSET	6
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) #define SIS_CONTACT_HEIGHT_OFFSET	7
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) #define SIS_CONTACT_PRESSURE_OFFSET(id)	(SIS_PKT_HAS_AREA(id) ? 8 : 6)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) /* Individual contact state */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) #define SIS_STATUS_UP			0x0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) #define SIS_STATUS_DOWN			0x3
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) /* Touchscreen parameters */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) #define SIS_MAX_FINGERS			10
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) #define SIS_MAX_X			4095
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) #define SIS_MAX_Y			4095
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) #define SIS_MAX_PRESSURE		255
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) /* Resolution diagonal */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) #define SIS_AREA_LENGTH_LONGER		5792
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) /*((SIS_MAX_X^2) + (SIS_MAX_Y^2))^0.5*/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) #define SIS_AREA_LENGTH_SHORT		5792
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) #define SIS_AREA_UNIT			(5792 / 32)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) struct sis_ts_data {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 	struct i2c_client *client;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 	struct input_dev *input;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 	struct gpio_desc *attn_gpio;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 	struct gpio_desc *reset_gpio;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 	u8 packet[SIS_MAX_PACKET_SIZE];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) static int sis_read_packet(struct i2c_client *client, u8 *buf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 			   unsigned int *num_contacts,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 			   unsigned int *contact_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 	int count_idx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 	u16 len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 	u16 crc, pkg_crc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 	u8 report_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 	ret = i2c_master_recv(client, buf, SIS_MAX_PACKET_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 	if (ret <= 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 		return -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 	len = get_unaligned_le16(&buf[SIS_PKT_LEN_OFFSET]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 	if (len > SIS_MAX_PACKET_SIZE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 		dev_err(&client->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 			"%s: invalid packet length (%d vs %d)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 			__func__, len, SIS_MAX_PACKET_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 		return -E2BIG;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 	if (len < 10)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 	report_id = buf[SIS_PKT_REPORT_OFFSET];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 	count_idx  = len - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 	*contact_size = SIS_BASE_LEN_PER_CONTACT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 	if (report_id != SIS_ALL_IN_ONE_PACKAGE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 		if (SIS_PKT_IS_TOUCH(report_id)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 			/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 			 * Calculate CRC ignoring packet length
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 			 * in the beginning and CRC transmitted
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 			 * at the end of the packet.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 			 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 			crc = crc_itu_t(0, buf + 2, len - 2 - 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 			pkg_crc = get_unaligned_le16(&buf[len - 2]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 			if (crc != pkg_crc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 				dev_err(&client->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 					"%s: CRC Error (%d vs %d)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 					__func__, crc, pkg_crc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 				return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 			count_idx -= 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 		} else if (!SIS_PKT_IS_HIDI2C(report_id)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 			dev_err(&client->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 				"%s: invalid packet ID %#02x\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 				__func__, report_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 			return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 		if (SIS_PKT_HAS_SCANTIME(report_id))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 			count_idx -= SIS_SCAN_TIME_LEN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 		if (SIS_PKT_HAS_AREA(report_id))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 			*contact_size += SIS_AREA_LEN_PER_CONTACT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 		if (SIS_PKT_HAS_PRESSURE(report_id))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 			*contact_size += SIS_PRESSURE_LEN_PER_CONTACT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 	*num_contacts = buf[count_idx];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) static int sis_ts_report_contact(struct sis_ts_data *ts, const u8 *data, u8 id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 	struct input_dev *input = ts->input;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 	int slot;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 	u8 status = data[SIS_CONTACT_STATUS_OFFSET];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 	u8 pressure;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 	u8 height, width;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 	u16 x, y;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 	if (status != SIS_STATUS_DOWN && status != SIS_STATUS_UP) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 		dev_err(&ts->client->dev, "Unexpected touch status: %#02x\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 			data[SIS_CONTACT_STATUS_OFFSET]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 	slot = input_mt_get_slot_by_key(input, data[SIS_CONTACT_ID_OFFSET]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 	if (slot < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 		return -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 	input_mt_slot(input, slot);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 	input_mt_report_slot_state(input, MT_TOOL_FINGER,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 				   status == SIS_STATUS_DOWN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 	if (status == SIS_STATUS_DOWN) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 		pressure = height = width = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 		if (id != SIS_ALL_IN_ONE_PACKAGE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 			if (SIS_PKT_HAS_AREA(id)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 				width = data[SIS_CONTACT_WIDTH_OFFSET];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 				height = data[SIS_CONTACT_HEIGHT_OFFSET];
^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) 			if (SIS_PKT_HAS_PRESSURE(id))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 				pressure =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 					data[SIS_CONTACT_PRESSURE_OFFSET(id)];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 		x = get_unaligned_le16(&data[SIS_CONTACT_X_OFFSET]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 		y = get_unaligned_le16(&data[SIS_CONTACT_Y_OFFSET]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 		input_report_abs(input, ABS_MT_TOUCH_MAJOR,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 				 width * SIS_AREA_UNIT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 		input_report_abs(input, ABS_MT_TOUCH_MINOR,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 				 height * SIS_AREA_UNIT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 		input_report_abs(input, ABS_MT_PRESSURE, pressure);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 		input_report_abs(input, ABS_MT_POSITION_X, x);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 		input_report_abs(input, ABS_MT_POSITION_Y, y);
^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) 	return 0;
^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) static void sis_ts_handle_packet(struct sis_ts_data *ts)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 	const u8 *contact;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 	unsigned int num_to_report = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 	unsigned int num_contacts;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 	unsigned int num_reported;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 	unsigned int contact_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 	int error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 	u8 report_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 	do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 		error = sis_read_packet(ts->client, ts->packet,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 					&num_contacts, &contact_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 		if (error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 		if (num_to_report == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 			num_to_report = num_contacts;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 		} else if (num_contacts != 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 			dev_err(&ts->client->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 				"%s: nonzero (%d) point count in tail packet\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 				__func__, num_contacts);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 		report_id = ts->packet[SIS_PKT_REPORT_OFFSET];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 		contact = &ts->packet[SIS_PKT_CONTACT_OFFSET];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 		num_reported = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 		while (num_to_report > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 			error = sis_ts_report_contact(ts, contact, report_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 			if (error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 				break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 			contact += contact_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 			num_to_report--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 			num_reported++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 			if (report_id != SIS_ALL_IN_ONE_PACKAGE &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 			    num_reported >= 5) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 				/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 				 * The remainder of contacts is sent
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 				 * in the 2nd packet.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 				 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 				break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 	} while (num_to_report > 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 	input_mt_sync_frame(ts->input);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 	input_sync(ts->input);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) static irqreturn_t sis_ts_irq_handler(int irq, void *dev_id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 	struct sis_ts_data *ts = dev_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 	do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 		sis_ts_handle_packet(ts);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 	} while (ts->attn_gpio && gpiod_get_value_cansleep(ts->attn_gpio));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 	return IRQ_HANDLED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) static void sis_ts_reset(struct sis_ts_data *ts)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 	if (ts->reset_gpio) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 		/* Get out of reset */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 		usleep_range(1000, 2000);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 		gpiod_set_value(ts->reset_gpio, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 		usleep_range(1000, 2000);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 		gpiod_set_value(ts->reset_gpio, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 		msleep(100);
^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) static int sis_ts_probe(struct i2c_client *client,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 			const struct i2c_device_id *id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 	struct sis_ts_data *ts;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 	struct input_dev *input;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 	int error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 	ts = devm_kzalloc(&client->dev, sizeof(*ts), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 	if (!ts)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 	ts->client = client;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) 	ts->attn_gpio = devm_gpiod_get_optional(&client->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 						"attn", GPIOD_IN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 	if (IS_ERR(ts->attn_gpio)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) 		error = PTR_ERR(ts->attn_gpio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 		if (error != -EPROBE_DEFER)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 			dev_err(&client->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 				"Failed to get attention GPIO: %d\n", error);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 		return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 	ts->reset_gpio = devm_gpiod_get_optional(&client->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) 						 "reset", GPIOD_OUT_LOW);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) 	if (IS_ERR(ts->reset_gpio)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) 		error = PTR_ERR(ts->reset_gpio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) 		if (error != -EPROBE_DEFER)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) 			dev_err(&client->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) 				"Failed to get reset GPIO: %d\n", error);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) 		return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) 	sis_ts_reset(ts);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) 	ts->input = input = devm_input_allocate_device(&client->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) 	if (!input) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) 		dev_err(&client->dev, "Failed to allocate input device\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) 	input->name = "SiS Touchscreen";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) 	input->id.bustype = BUS_I2C;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) 	input_set_abs_params(input, ABS_MT_POSITION_X, 0, SIS_MAX_X, 0, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) 	input_set_abs_params(input, ABS_MT_POSITION_Y, 0, SIS_MAX_Y, 0, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) 	input_set_abs_params(input, ABS_MT_PRESSURE, 0, SIS_MAX_PRESSURE, 0, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) 	input_set_abs_params(input, ABS_MT_TOUCH_MAJOR,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) 			     0, SIS_AREA_LENGTH_LONGER, 0, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) 	input_set_abs_params(input, ABS_MT_TOUCH_MINOR,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) 			     0, SIS_AREA_LENGTH_SHORT, 0, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) 	error = input_mt_init_slots(input, SIS_MAX_FINGERS, INPUT_MT_DIRECT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) 	if (error) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) 		dev_err(&client->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) 			"Failed to initialize MT slots: %d\n", error);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) 		return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) 	error = devm_request_threaded_irq(&client->dev, client->irq,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) 					  NULL, sis_ts_irq_handler,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) 					  IRQF_ONESHOT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) 					  client->name, ts);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) 	if (error) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) 		dev_err(&client->dev, "Failed to request IRQ: %d\n", error);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) 		return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) 	error = input_register_device(ts->input);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) 	if (error) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) 		dev_err(&client->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) 			"Failed to register input device: %d\n", 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) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) #ifdef CONFIG_OF
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) static const struct of_device_id sis_ts_dt_ids[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) 	{ .compatible = "sis,9200-ts" },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) 	{ /* sentinel */ }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) MODULE_DEVICE_TABLE(of, sis_ts_dt_ids);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) static const struct i2c_device_id sis_ts_id[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) 	{ SIS_I2C_NAME,	0 },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) 	{ "9200-ts",	0 },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) 	{ /* sentinel */  }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) MODULE_DEVICE_TABLE(i2c, sis_ts_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) static struct i2c_driver sis_ts_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) 	.driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) 		.name	= SIS_I2C_NAME,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) 		.of_match_table = of_match_ptr(sis_ts_dt_ids),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) 	},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) 	.probe		= sis_ts_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) 	.id_table	= sis_ts_id,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) module_i2c_driver(sis_ts_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) MODULE_DESCRIPTION("SiS 9200 Family Touchscreen Driver");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) MODULE_LICENSE("GPL v2");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) MODULE_AUTHOR("Mika Penttilä <mika.penttila@nextfour.com>");