// SPDX-License-Identifier: GPL-2.0-only /* * Touch Screen driver for SiS 9200 family I2C Touch panels * * Copyright (C) 2015 SiS, Inc. * Copyright (C) 2016 Nextfour Group */ #include <linux/crc-itu-t.h> #include <linux/delay.h> #include <linux/i2c.h> #include <linux/input.h> #include <linux/input/mt.h> #include <linux/interrupt.h> #include <linux/gpio/consumer.h> #include <linux/module.h> #include <linux/slab.h> #include <linux/unaligned.h> #define SIS_I2C_NAME … /* * The I2C packet format: * le16 byte count * u8 Report ID * <contact data - variable length> * u8 Number of contacts * le16 Scan Time (optional) * le16 CRC * * One touch point information consists of 6+ bytes, the order is: * u8 contact state * u8 finger id * le16 x axis * le16 y axis * u8 contact width (optional) * u8 contact height (optional) * u8 pressure (optional) * * Maximum amount of data transmitted in one shot is 64 bytes, if controller * needs to report more contacts than fit in one packet it will send true * number of contacts in first packet and 0 as number of contacts in second * packet. */ #define SIS_MAX_PACKET_SIZE … #define SIS_PKT_LEN_OFFSET … #define SIS_PKT_REPORT_OFFSET … #define SIS_PKT_CONTACT_OFFSET … #define SIS_SCAN_TIME_LEN … /* Supported report types */ #define SIS_ALL_IN_ONE_PACKAGE … #define SIS_PKT_IS_TOUCH(x) … #define SIS_PKT_IS_HIDI2C(x) … /* Contact properties within report */ #define SIS_PKT_HAS_AREA(x) … #define SIS_PKT_HAS_PRESSURE(x) … #define SIS_PKT_HAS_SCANTIME(x) … /* Contact size */ #define SIS_BASE_LEN_PER_CONTACT … #define SIS_AREA_LEN_PER_CONTACT … #define SIS_PRESSURE_LEN_PER_CONTACT … /* Offsets within contact data */ #define SIS_CONTACT_STATUS_OFFSET … #define SIS_CONTACT_ID_OFFSET … #define SIS_CONTACT_X_OFFSET … #define SIS_CONTACT_Y_OFFSET … #define SIS_CONTACT_WIDTH_OFFSET … #define SIS_CONTACT_HEIGHT_OFFSET … #define SIS_CONTACT_PRESSURE_OFFSET(id) … /* Individual contact state */ #define SIS_STATUS_UP … #define SIS_STATUS_DOWN … /* Touchscreen parameters */ #define SIS_MAX_FINGERS … #define SIS_MAX_X … #define SIS_MAX_Y … #define SIS_MAX_PRESSURE … /* Resolution diagonal */ #define SIS_AREA_LENGTH_LONGER … /*((SIS_MAX_X^2) + (SIS_MAX_Y^2))^0.5*/ #define SIS_AREA_LENGTH_SHORT … #define SIS_AREA_UNIT … struct sis_ts_data { … }; static int sis_read_packet(struct i2c_client *client, u8 *buf, unsigned int *num_contacts, unsigned int *contact_size) { … } static int sis_ts_report_contact(struct sis_ts_data *ts, const u8 *data, u8 id) { … } static void sis_ts_handle_packet(struct sis_ts_data *ts) { … } static irqreturn_t sis_ts_irq_handler(int irq, void *dev_id) { … } static void sis_ts_reset(struct sis_ts_data *ts) { … } static int sis_ts_probe(struct i2c_client *client) { … } #ifdef CONFIG_OF static const struct of_device_id sis_ts_dt_ids[] = …; MODULE_DEVICE_TABLE(of, sis_ts_dt_ids); #endif static const struct i2c_device_id sis_ts_id[] = …; MODULE_DEVICE_TABLE(i2c, sis_ts_id); static struct i2c_driver sis_ts_driver = …; module_i2c_driver(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …; MODULE_AUTHOR(…) …;
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