mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-09 07:46:40 +07:00
01b944fe1c
Prepare first round of input updates for 4.3 merge window.
462 lines
11 KiB
C
462 lines
11 KiB
C
/*
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* Driver for Goodix Touchscreens
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*
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* Copyright (c) 2014 Red Hat Inc.
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*
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* This code is based on gt9xx.c authored by andrew@goodix.com:
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*
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* 2010 - 2012 Goodix Technology.
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*/
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/*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; version 2 of the License.
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*/
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#include <linux/kernel.h>
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#include <linux/dmi.h>
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#include <linux/i2c.h>
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#include <linux/input.h>
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#include <linux/input/mt.h>
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#include <linux/module.h>
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#include <linux/delay.h>
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#include <linux/irq.h>
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#include <linux/interrupt.h>
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#include <linux/slab.h>
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#include <linux/acpi.h>
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#include <linux/of.h>
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#include <asm/unaligned.h>
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struct goodix_ts_data {
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struct i2c_client *client;
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struct input_dev *input_dev;
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int abs_x_max;
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int abs_y_max;
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unsigned int max_touch_num;
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unsigned int int_trigger_type;
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bool rotated_screen;
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};
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#define GOODIX_MAX_HEIGHT 4096
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#define GOODIX_MAX_WIDTH 4096
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#define GOODIX_INT_TRIGGER 1
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#define GOODIX_CONTACT_SIZE 8
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#define GOODIX_MAX_CONTACTS 10
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#define GOODIX_CONFIG_MAX_LENGTH 240
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/* Register defines */
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#define GOODIX_READ_COOR_ADDR 0x814E
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#define GOODIX_REG_CONFIG_DATA 0x8047
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#define GOODIX_REG_ID 0x8140
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#define RESOLUTION_LOC 1
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#define MAX_CONTACTS_LOC 5
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#define TRIGGER_LOC 6
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static const unsigned long goodix_irq_flags[] = {
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IRQ_TYPE_EDGE_RISING,
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IRQ_TYPE_EDGE_FALLING,
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IRQ_TYPE_LEVEL_LOW,
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IRQ_TYPE_LEVEL_HIGH,
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};
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/*
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* Those tablets have their coordinates origin at the bottom right
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* of the tablet, as if rotated 180 degrees
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*/
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static const struct dmi_system_id rotated_screen[] = {
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#if defined(CONFIG_DMI) && defined(CONFIG_X86)
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{
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.ident = "WinBook TW100",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "WinBook"),
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DMI_MATCH(DMI_PRODUCT_NAME, "TW100")
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}
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},
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{
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.ident = "WinBook TW700",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "WinBook"),
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DMI_MATCH(DMI_PRODUCT_NAME, "TW700")
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},
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},
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#endif
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{}
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};
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/**
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* goodix_i2c_read - read data from a register of the i2c slave device.
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*
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* @client: i2c device.
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* @reg: the register to read from.
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* @buf: raw write data buffer.
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* @len: length of the buffer to write
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*/
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static int goodix_i2c_read(struct i2c_client *client,
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u16 reg, u8 *buf, int len)
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{
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struct i2c_msg msgs[2];
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u16 wbuf = cpu_to_be16(reg);
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int ret;
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msgs[0].flags = 0;
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msgs[0].addr = client->addr;
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msgs[0].len = 2;
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msgs[0].buf = (u8 *)&wbuf;
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msgs[1].flags = I2C_M_RD;
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msgs[1].addr = client->addr;
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msgs[1].len = len;
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msgs[1].buf = buf;
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ret = i2c_transfer(client->adapter, msgs, 2);
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return ret < 0 ? ret : (ret != ARRAY_SIZE(msgs) ? -EIO : 0);
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}
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static int goodix_ts_read_input_report(struct goodix_ts_data *ts, u8 *data)
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{
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int touch_num;
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int error;
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error = goodix_i2c_read(ts->client, GOODIX_READ_COOR_ADDR, data,
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GOODIX_CONTACT_SIZE + 1);
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if (error) {
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dev_err(&ts->client->dev, "I2C transfer error: %d\n", error);
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return error;
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}
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if (!(data[0] & 0x80))
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return -EAGAIN;
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touch_num = data[0] & 0x0f;
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if (touch_num > ts->max_touch_num)
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return -EPROTO;
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if (touch_num > 1) {
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data += 1 + GOODIX_CONTACT_SIZE;
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error = goodix_i2c_read(ts->client,
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GOODIX_READ_COOR_ADDR +
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1 + GOODIX_CONTACT_SIZE,
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data,
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GOODIX_CONTACT_SIZE * (touch_num - 1));
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if (error)
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return error;
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}
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return touch_num;
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}
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static void goodix_ts_report_touch(struct goodix_ts_data *ts, u8 *coor_data)
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{
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int id = coor_data[0] & 0x0F;
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int input_x = get_unaligned_le16(&coor_data[1]);
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int input_y = get_unaligned_le16(&coor_data[3]);
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int input_w = get_unaligned_le16(&coor_data[5]);
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if (ts->rotated_screen) {
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input_x = ts->abs_x_max - input_x;
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input_y = ts->abs_y_max - input_y;
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}
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input_mt_slot(ts->input_dev, id);
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input_mt_report_slot_state(ts->input_dev, MT_TOOL_FINGER, true);
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input_report_abs(ts->input_dev, ABS_MT_POSITION_X, input_x);
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input_report_abs(ts->input_dev, ABS_MT_POSITION_Y, input_y);
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input_report_abs(ts->input_dev, ABS_MT_TOUCH_MAJOR, input_w);
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input_report_abs(ts->input_dev, ABS_MT_WIDTH_MAJOR, input_w);
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}
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/**
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* goodix_process_events - Process incoming events
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*
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* @ts: our goodix_ts_data pointer
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*
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* Called when the IRQ is triggered. Read the current device state, and push
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* the input events to the user space.
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*/
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static void goodix_process_events(struct goodix_ts_data *ts)
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{
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u8 point_data[1 + GOODIX_CONTACT_SIZE * GOODIX_MAX_CONTACTS];
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int touch_num;
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int i;
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touch_num = goodix_ts_read_input_report(ts, point_data);
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if (touch_num < 0)
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return;
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for (i = 0; i < touch_num; i++)
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goodix_ts_report_touch(ts,
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&point_data[1 + GOODIX_CONTACT_SIZE * i]);
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input_mt_sync_frame(ts->input_dev);
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input_sync(ts->input_dev);
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}
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/**
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* goodix_ts_irq_handler - The IRQ handler
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*
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* @irq: interrupt number.
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* @dev_id: private data pointer.
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*/
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static irqreturn_t goodix_ts_irq_handler(int irq, void *dev_id)
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{
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static const u8 end_cmd[] = {
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GOODIX_READ_COOR_ADDR >> 8,
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GOODIX_READ_COOR_ADDR & 0xff,
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0
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};
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struct goodix_ts_data *ts = dev_id;
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goodix_process_events(ts);
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if (i2c_master_send(ts->client, end_cmd, sizeof(end_cmd)) < 0)
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dev_err(&ts->client->dev, "I2C write end_cmd error\n");
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return IRQ_HANDLED;
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}
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/**
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* goodix_read_config - Read the embedded configuration of the panel
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*
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* @ts: our goodix_ts_data pointer
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*
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* Must be called during probe
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*/
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static void goodix_read_config(struct goodix_ts_data *ts)
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{
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u8 config[GOODIX_CONFIG_MAX_LENGTH];
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int error;
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error = goodix_i2c_read(ts->client, GOODIX_REG_CONFIG_DATA,
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config,
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GOODIX_CONFIG_MAX_LENGTH);
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if (error) {
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dev_warn(&ts->client->dev,
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"Error reading config (%d), using defaults\n",
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error);
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ts->abs_x_max = GOODIX_MAX_WIDTH;
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ts->abs_y_max = GOODIX_MAX_HEIGHT;
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ts->int_trigger_type = GOODIX_INT_TRIGGER;
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ts->max_touch_num = GOODIX_MAX_CONTACTS;
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return;
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}
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ts->abs_x_max = get_unaligned_le16(&config[RESOLUTION_LOC]);
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ts->abs_y_max = get_unaligned_le16(&config[RESOLUTION_LOC + 2]);
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ts->int_trigger_type = config[TRIGGER_LOC] & 0x03;
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ts->max_touch_num = config[MAX_CONTACTS_LOC] & 0x0f;
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if (!ts->abs_x_max || !ts->abs_y_max || !ts->max_touch_num) {
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dev_err(&ts->client->dev,
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"Invalid config, using defaults\n");
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ts->abs_x_max = GOODIX_MAX_WIDTH;
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ts->abs_y_max = GOODIX_MAX_HEIGHT;
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ts->max_touch_num = GOODIX_MAX_CONTACTS;
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}
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ts->rotated_screen = dmi_check_system(rotated_screen);
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if (ts->rotated_screen)
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dev_dbg(&ts->client->dev,
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"Applying '180 degrees rotated screen' quirk\n");
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}
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/**
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* goodix_read_version - Read goodix touchscreen version
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*
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* @client: the i2c client
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* @version: output buffer containing the version on success
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* @id: output buffer containing the id on success
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*/
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static int goodix_read_version(struct i2c_client *client, u16 *version, u16 *id)
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{
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int error;
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u8 buf[6];
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char id_str[5];
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error = goodix_i2c_read(client, GOODIX_REG_ID, buf, sizeof(buf));
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if (error) {
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dev_err(&client->dev, "read version failed: %d\n", error);
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return error;
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}
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memcpy(id_str, buf, 4);
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id_str[4] = 0;
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if (kstrtou16(id_str, 10, id))
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*id = 0x1001;
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*version = get_unaligned_le16(&buf[4]);
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dev_info(&client->dev, "ID %d, version: %04x\n", *id, *version);
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return 0;
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}
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/**
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* goodix_i2c_test - I2C test function to check if the device answers.
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*
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* @client: the i2c client
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*/
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static int goodix_i2c_test(struct i2c_client *client)
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{
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int retry = 0;
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int error;
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u8 test;
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while (retry++ < 2) {
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error = goodix_i2c_read(client, GOODIX_REG_CONFIG_DATA,
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&test, 1);
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if (!error)
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return 0;
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dev_err(&client->dev, "i2c test failed attempt %d: %d\n",
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retry, error);
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msleep(20);
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}
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return error;
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}
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/**
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* goodix_request_input_dev - Allocate, populate and register the input device
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*
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* @ts: our goodix_ts_data pointer
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* @version: device firmware version
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* @id: device ID
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*
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* Must be called during probe
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*/
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static int goodix_request_input_dev(struct goodix_ts_data *ts, u16 version,
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u16 id)
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{
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int error;
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ts->input_dev = devm_input_allocate_device(&ts->client->dev);
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if (!ts->input_dev) {
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dev_err(&ts->client->dev, "Failed to allocate input device.");
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return -ENOMEM;
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}
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input_set_abs_params(ts->input_dev, ABS_MT_POSITION_X,
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0, ts->abs_x_max, 0, 0);
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input_set_abs_params(ts->input_dev, ABS_MT_POSITION_Y,
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0, ts->abs_y_max, 0, 0);
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input_set_abs_params(ts->input_dev, ABS_MT_WIDTH_MAJOR, 0, 255, 0, 0);
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input_set_abs_params(ts->input_dev, ABS_MT_TOUCH_MAJOR, 0, 255, 0, 0);
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input_mt_init_slots(ts->input_dev, ts->max_touch_num,
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INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED);
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ts->input_dev->name = "Goodix Capacitive TouchScreen";
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ts->input_dev->phys = "input/ts";
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ts->input_dev->id.bustype = BUS_I2C;
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ts->input_dev->id.vendor = 0x0416;
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ts->input_dev->id.product = id;
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ts->input_dev->id.version = version;
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error = input_register_device(ts->input_dev);
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if (error) {
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dev_err(&ts->client->dev,
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"Failed to register input device: %d", error);
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return error;
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}
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return 0;
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}
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static int goodix_ts_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct goodix_ts_data *ts;
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unsigned long irq_flags;
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int error;
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u16 version_info, id_info;
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dev_dbg(&client->dev, "I2C Address: 0x%02x\n", client->addr);
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if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
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dev_err(&client->dev, "I2C check functionality failed.\n");
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return -ENXIO;
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}
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ts = devm_kzalloc(&client->dev, sizeof(*ts), GFP_KERNEL);
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if (!ts)
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return -ENOMEM;
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ts->client = client;
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i2c_set_clientdata(client, ts);
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error = goodix_i2c_test(client);
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if (error) {
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dev_err(&client->dev, "I2C communication failure: %d\n", error);
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return error;
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}
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error = goodix_read_version(client, &version_info, &id_info);
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if (error) {
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dev_err(&client->dev, "Read version failed.\n");
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return error;
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}
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goodix_read_config(ts);
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error = goodix_request_input_dev(ts, version_info, id_info);
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if (error)
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return error;
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irq_flags = goodix_irq_flags[ts->int_trigger_type] | IRQF_ONESHOT;
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error = devm_request_threaded_irq(&ts->client->dev, client->irq,
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NULL, goodix_ts_irq_handler,
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irq_flags, client->name, ts);
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if (error) {
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dev_err(&client->dev, "request IRQ failed: %d\n", error);
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return error;
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}
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return 0;
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}
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static const struct i2c_device_id goodix_ts_id[] = {
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{ "GDIX1001:00", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, goodix_ts_id);
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#ifdef CONFIG_ACPI
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static const struct acpi_device_id goodix_acpi_match[] = {
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{ "GDIX1001", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(acpi, goodix_acpi_match);
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#endif
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#ifdef CONFIG_OF
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static const struct of_device_id goodix_of_match[] = {
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{ .compatible = "goodix,gt911" },
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{ .compatible = "goodix,gt9110" },
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{ .compatible = "goodix,gt912" },
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{ .compatible = "goodix,gt927" },
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{ .compatible = "goodix,gt9271" },
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{ .compatible = "goodix,gt928" },
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{ .compatible = "goodix,gt967" },
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{ }
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};
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MODULE_DEVICE_TABLE(of, goodix_of_match);
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#endif
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static struct i2c_driver goodix_ts_driver = {
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.probe = goodix_ts_probe,
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.id_table = goodix_ts_id,
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.driver = {
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.name = "Goodix-TS",
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.acpi_match_table = ACPI_PTR(goodix_acpi_match),
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.of_match_table = of_match_ptr(goodix_of_match),
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},
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};
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module_i2c_driver(goodix_ts_driver);
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MODULE_AUTHOR("Benjamin Tissoires <benjamin.tissoires@gmail.com>");
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MODULE_AUTHOR("Bastien Nocera <hadess@hadess.net>");
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MODULE_DESCRIPTION("Goodix touchscreen driver");
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MODULE_LICENSE("GPL v2");
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