/*
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* Wacom Penabled Driver for I2C
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*
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* Copyright (c) 2011 - 2013 Tatsunosuke Tobita, Wacom.
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* <tobita.tatsunosuke@wacom.co.jp>
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*
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* This program is free software; you can redistribute it
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* and/or modify it under the terms of the GNU General
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* Public License as published by the Free Software
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* Foundation; either version of 2 of the License,
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* or (at your option) any later version.
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*/
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#include <linux/module.h>
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#include <linux/input.h>
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#include <linux/i2c.h>
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#include <linux/slab.h>
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#include <linux/irq.h>
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#include <linux/interrupt.h>
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#include <linux/gpio.h>
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#include <linux/of_gpio.h>
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#include <linux/delay.h>
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#include <asm/unaligned.h>
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#include <linux/regulator/driver.h>
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#include <linux/regulator/consumer.h>
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#include <linux/notifier.h>
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#include "tp_suspend.h"
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//#define ORIGIN_COORD
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static int exchange_x_y_flag = 0;
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static int revert_x_flag = 0;
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static int revert_y_flag = 0;
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static int screen_max_x = 20280;
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static int screen_max_y = 13942;
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#define WACOM_CMD_QUERY0 0x04
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#define WACOM_CMD_QUERY1 0x00
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#define WACOM_CMD_QUERY2 0x33
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#define WACOM_CMD_QUERY3 0x02
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#define WACOM_CMD_THROW0 0x05
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#define WACOM_CMD_THROW1 0x00
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#define WACOM_QUERY_SIZE 19
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struct wacom_features {
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int x_max;
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int y_max;
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int pressure_max;
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char fw_version;
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};
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/*HID specific register*/
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#define HID_DESC_REGISTER 1
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#define COMM_REG 0x04
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#define DATA_REG 0x05
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typedef struct hid_descriptor {
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u16 wHIDDescLength;
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u16 bcdVersion;
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u16 wReportDescLength;
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u16 wReportDescRegister;
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u16 wInputRegister;
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u16 wMaxInputLength;
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u16 wOutputRegister;
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u16 wMaxOutputLength;
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u16 wCommandRegister;
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u16 wDataRegister;
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u16 wVendorID;
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u16 wProductID;
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u16 wVersion;
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u16 RESERVED_HIGH;
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u16 RESERVED_LOW;
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} HID_DESC;
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struct wacom_i2c {
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struct wacom_features *features;
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struct i2c_client *client;
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struct input_dev *input;
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u8 data[WACOM_QUERY_SIZE];
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bool prox;
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int tool;
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struct tp_device tp;
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struct regulator *supply;
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int irq_gpio;
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int pen_detect_gpio;
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int reset_gpio;
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};
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static int get_hid_desc(struct i2c_client *client,
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struct hid_descriptor *hid_desc)
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{
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int ret = -1;
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char cmd[] = {HID_DESC_REGISTER, 0x00};
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struct i2c_msg msgs[] = {
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{
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.addr = client->addr,
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.flags = 0,
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.len = sizeof(cmd),
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.buf = cmd,
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},
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{
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.addr = client->addr,
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.flags = I2C_M_RD,
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.len = sizeof(HID_DESC),
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.buf = (char *)hid_desc,
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},
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};
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ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
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if (ret < 0)
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return ret;
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if (ret != ARRAY_SIZE(msgs))
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return -EIO;
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printk("******************************\n");
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printk("wacom firmware vesrsion:0x%x\n", hid_desc->wVersion);
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printk("******************************\n");
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ret = 0;
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//out:
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return ret;
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}
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static int wacom_query_device(struct i2c_client *client,
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struct wacom_features *features)
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{
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int ret;
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u8 cmd1[] = { WACOM_CMD_QUERY0, WACOM_CMD_QUERY1,
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WACOM_CMD_QUERY2, WACOM_CMD_QUERY3 };
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u8 cmd2[] = { WACOM_CMD_THROW0, WACOM_CMD_THROW1 };
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u8 data[WACOM_QUERY_SIZE];
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struct i2c_msg msgs[] = {
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{
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.addr = client->addr,
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.flags = 0,
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.len = sizeof(cmd1),
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.buf = cmd1,
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},
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{
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.addr = client->addr,
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.flags = 0,
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.len = sizeof(cmd2),
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.buf = cmd2,
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},
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{
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.addr = client->addr,
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.flags = I2C_M_RD,
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.len = sizeof(data),
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.buf = data,
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},
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};
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ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
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if (ret < 0)
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return ret;
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if (ret != ARRAY_SIZE(msgs))
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return -EIO;
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features->x_max = get_unaligned_le16(&data[3]);
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features->y_max = get_unaligned_le16(&data[5]);
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features->pressure_max = get_unaligned_le16(&data[11]);
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features->fw_version = get_unaligned_le16(&data[13]);
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printk("Wacom source screen x_max:%d, y_max:%d, pressure:%d, fw:%d\n",
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features->x_max, features->y_max,
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features->pressure_max, features->fw_version);
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if (1 == exchange_x_y_flag) {
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swap(features->x_max, features->y_max);
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}
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screen_max_x = features->x_max;
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screen_max_y = features->y_max;
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printk("Wacom desc screen x_max:%d, y_max:%d\n", features->x_max, features->y_max);
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return 0;
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}
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static irqreturn_t wacom_i2c_irq(int irq, void *dev_id)
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{
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struct wacom_i2c *wac_i2c = dev_id;
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struct input_dev *input = wac_i2c->input;
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//struct wacom_features *features = wac_i2c->features;
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u8 *data = wac_i2c->data;
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unsigned int x, y, pressure;
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signed short tilt_x, tilt_y;
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unsigned char tsw, f1, f2, ers;
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int error;
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if (device_can_wakeup(&wac_i2c->client->dev))
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pm_stay_awake(&wac_i2c->client->dev);
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error = i2c_master_recv(wac_i2c->client,
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wac_i2c->data, sizeof(wac_i2c->data));
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if (error < 0)
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goto out;
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tsw = data[3] & 0x01;
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ers = data[3] & 0x04;
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f1 = data[3] & 0x02;
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f2 = data[3] & 0x10;
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x = le16_to_cpup((__le16 *)&data[4]);
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y = le16_to_cpup((__le16 *)&data[6]);
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pressure = le16_to_cpup((__le16 *)&data[8]);
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tilt_x = le16_to_cpup((__le16 *)&data[11]);
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tilt_y = le16_to_cpup((__le16 *)&data[13]);
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if (!wac_i2c->prox)
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wac_i2c->tool = (data[3] & 0x0c) ?
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BTN_TOOL_RUBBER : BTN_TOOL_PEN;
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wac_i2c->prox = data[3] & 0x20;
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if (1 == exchange_x_y_flag) {
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swap(x, y);
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}
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if (1 == revert_x_flag) {
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x = screen_max_x - x;
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}
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if (1 == revert_y_flag) {
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y = screen_max_y - y;
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}
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input_report_key(input, BTN_TOUCH, tsw || ers);
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input_report_key(input, wac_i2c->tool, wac_i2c->prox);
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input_report_key(input, BTN_STYLUS, f1);
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input_report_key(input, BTN_STYLUS2, f2);
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input_report_abs(input, ABS_X, x);
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input_report_abs(input, ABS_Y, y);
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input_report_abs(input, ABS_TILT_X, tilt_x / 100);
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input_report_abs(input, ABS_TILT_Y, tilt_y / 100);
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input_report_abs(input, ABS_PRESSURE, pressure);
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input_sync(input);
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out:
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if (device_can_wakeup(&wac_i2c->client->dev))
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pm_relax(&wac_i2c->client->dev);
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return IRQ_HANDLED;
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}
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static int wacom_i2c_open(struct input_dev *dev)
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{
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struct wacom_i2c *wac_i2c = input_get_drvdata(dev);
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struct i2c_client *client = wac_i2c->client;
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enable_irq(client->irq);
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return 0;
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}
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static void wacom_i2c_close(struct input_dev *dev)
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{
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struct wacom_i2c *wac_i2c = input_get_drvdata(dev);
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struct i2c_client *client = wac_i2c->client;
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disable_irq(client->irq);
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}
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static int __maybe_unused wacom_i2c_suspend(struct tp_device *tp_d)
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{
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struct wacom_i2c *wac_i2c = container_of(tp_d, struct wacom_i2c, tp);
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dev_dbg(&wac_i2c->client->dev, "%s\n", __func__);
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disable_irq(wac_i2c->client->irq);
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if (wac_i2c->supply) {
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gpio_direction_output(wac_i2c->irq_gpio, 0);
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gpio_direction_output(wac_i2c->pen_detect_gpio, 0);
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gpio_direction_output(wac_i2c->reset_gpio, 0);
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regulator_disable(wac_i2c->supply);
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}
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return 0;
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}
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static int __maybe_unused wacom_i2c_resume(struct tp_device *tp_d)
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{
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struct wacom_i2c *wac_i2c = container_of(tp_d, struct wacom_i2c, tp);
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int ret;
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dev_dbg(&wac_i2c->client->dev, "%s\n", __func__);
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if (wac_i2c->supply) {
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gpio_direction_input(wac_i2c->irq_gpio);
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gpio_direction_input(wac_i2c->pen_detect_gpio);
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gpio_direction_output(wac_i2c->reset_gpio, 1);
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ret = regulator_enable(wac_i2c->supply);
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if (ret < 0)
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dev_err(&wac_i2c->client->dev, "failed to enable wacom power supply\n");
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}
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enable_irq(wac_i2c->client->irq);
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return 0;
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}
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static int wacom_i2c_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct wacom_i2c *wac_i2c;
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struct input_dev *input;
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struct wacom_features features = { 0 };
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HID_DESC hid_desc = { 0 };
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struct device_node *wac_np;
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int error;
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struct regulator *power_supply;
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wac_np = client->dev.of_node;
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if (!wac_np) {
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dev_err(&client->dev, "get device node error\n");
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return -ENODEV;
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}
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if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
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dev_err(&client->dev, "i2c_check_functionality error\n");
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return -EIO;
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}
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of_property_read_u32(wac_np, "revert_x", &revert_x_flag);
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of_property_read_u32(wac_np, "revert_y", &revert_y_flag);
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of_property_read_u32(wac_np, "xy_exchange", &exchange_x_y_flag);
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power_supply = devm_regulator_get(&client->dev, "pwr");
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if (power_supply) {
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dev_info(&client->dev, "wacom power supply = %dmv\n", regulator_get_voltage(power_supply));
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error = regulator_enable(power_supply);
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if (error < 0)
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dev_err(&client->dev, "failed to enable wacom power supply\n");
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}
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error = wacom_query_device(client, &features);
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if (error)
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return error;
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error = get_hid_desc(client, &hid_desc);
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if (error)
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return error;
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wac_i2c = kzalloc(sizeof(*wac_i2c), GFP_KERNEL);
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input = input_allocate_device();
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if (!wac_i2c || !input) {
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error = -ENOMEM;
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goto err_free_mem;
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}
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if (power_supply)
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wac_i2c->supply = power_supply;
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wac_i2c->reset_gpio = of_get_named_gpio(wac_np, "gpio_rst", 0);
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if (!gpio_is_valid(wac_i2c->reset_gpio)) {
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dev_err(&client->dev, "no gpio_rst pin available\n");
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goto err_free_mem;
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}
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error = devm_gpio_request_one(&client->dev, wac_i2c->reset_gpio, GPIOF_OUT_INIT_LOW, "gpio-rst");
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if (error < 0) {
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goto err_free_mem;
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}
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gpio_direction_output(wac_i2c->reset_gpio, 0);
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msleep(100);
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gpio_direction_output(wac_i2c->reset_gpio, 1);
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wac_i2c->pen_detect_gpio = of_get_named_gpio(wac_np, "gpio_detect", 0);
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if (!gpio_is_valid(wac_i2c->pen_detect_gpio)) {
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dev_err(&client->dev, "no pen_detect_gpio pin available\n");
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goto err_free_reset_gpio;
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}
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error = devm_gpio_request_one(&client->dev, wac_i2c->pen_detect_gpio, GPIOF_IN, "gpio_detect");
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if (error < 0) {
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goto err_free_reset_gpio;
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}
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wac_i2c->irq_gpio = of_get_named_gpio(wac_np, "gpio_intr", 0);
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if (!gpio_is_valid(wac_i2c->irq_gpio)) {
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dev_err(&client->dev, "no gpio_intr pin available\n");
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goto err_free_pen_detect_gpio;
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}
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error = devm_gpio_request_one(&client->dev, wac_i2c->irq_gpio, GPIOF_IN, "gpio_intr");
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if (error < 0) {
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goto err_free_pen_detect_gpio;
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}
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client->irq = gpio_to_irq(wac_i2c->irq_gpio);
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if (client->irq < 0) {
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dev_err(&client->dev, "Unable to get irq number for GPIO %d, error %d\n", wac_i2c->irq_gpio, client->irq);
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goto err_free_irq_gpio;
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}
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wac_i2c->features = &features;
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wac_i2c->client = client;
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wac_i2c->input = input;
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input->name = "Wacom I2C Digitizer";
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input->id.bustype = BUS_I2C;
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input->id.vendor = 0x56a;
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//input->id.version = features.fw_version;
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input->id.version = hid_desc.wVersion;
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input->dev.parent = &client->dev;
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input->open = wacom_i2c_open;
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input->close = wacom_i2c_close;
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input->evbit[0] |= BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
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__set_bit(BTN_TOOL_PEN, input->keybit);
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__set_bit(BTN_TOOL_RUBBER, input->keybit);
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__set_bit(BTN_STYLUS, input->keybit);
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__set_bit(BTN_STYLUS2, input->keybit);
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__set_bit(BTN_TOUCH, input->keybit);
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__set_bit(INPUT_PROP_DIRECT, input->propbit);
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input_set_abs_params(input, ABS_X, 0, features.x_max, 0, 0);
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input_set_abs_params(input, ABS_Y, 0, features.y_max, 0, 0);
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input_set_abs_params(input, ABS_PRESSURE, 0, features.pressure_max, 0, 0);
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input_set_abs_params(input, ABS_TILT_X, -90, 90, 0, 0);
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input_set_abs_params(input, ABS_TILT_Y, -90, 90, 0, 0);
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input_set_drvdata(input, wac_i2c);
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error = request_threaded_irq(client->irq, NULL, wacom_i2c_irq,
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IRQF_TRIGGER_LOW | IRQF_ONESHOT,
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"wacom", wac_i2c);
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if (error) {
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dev_err(&client->dev,
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"Failed to enable IRQ, error: %d\n", error);
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goto err_free_mem;
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}
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/* Disable the IRQ, we'll enable it in wac_i2c_open() */
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disable_irq(client->irq);
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error = input_register_device(wac_i2c->input);
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if (error) {
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dev_err(&client->dev,
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"Failed to register input device, error: %d\n", error);
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goto err_free_irq;
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}
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device_init_wakeup(&client->dev, 1);
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enable_irq_wake(client->irq);
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wac_i2c->tp.tp_resume = wacom_i2c_resume;
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wac_i2c->tp.tp_suspend = wacom_i2c_suspend;
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tp_register_fb(&wac_i2c->tp);
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i2c_set_clientdata(client, wac_i2c);
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return 0;
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err_free_irq:
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free_irq(client->irq, wac_i2c);
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err_free_reset_gpio:
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err_free_pen_detect_gpio:
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err_free_irq_gpio:
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err_free_mem:
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input_free_device(input);
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kfree(wac_i2c);
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return error;
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}
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static int wacom_i2c_remove(struct i2c_client *client)
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{
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struct wacom_i2c *wac_i2c = i2c_get_clientdata(client);
|
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free_irq(client->irq, wac_i2c);
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input_unregister_device(wac_i2c->input);
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kfree(wac_i2c);
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return 0;
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}
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static const struct i2c_device_id wacom_i2c_id[] = {
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{ "wacom", 0 },
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{ },
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};
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MODULE_DEVICE_TABLE(i2c, wacom_i2c_id);
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static const struct of_device_id wacom_dt_ids[] = {
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{
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.compatible = "wacom,w9013",
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.data = (void *) &wacom_i2c_id[0],
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}, {
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/* sentinel */
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}
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};
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MODULE_DEVICE_TABLE(of, wacom_dt_ids);
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static struct i2c_driver wacom_i2c_driver = {
|
.driver = {
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.name = "wacom",
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.owner = THIS_MODULE,
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.of_match_table = wacom_dt_ids,
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},
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.probe = wacom_i2c_probe,
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.remove = wacom_i2c_remove,
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.id_table = wacom_i2c_id,
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};
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static int __init wacom_init(void)
|
{
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return i2c_add_driver(&wacom_i2c_driver);
|
}
|
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static void __exit wacom_exit(void)
|
{
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i2c_del_driver(&wacom_i2c_driver);
|
}
|
|
/*
|
* Module entry points
|
*/
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subsys_initcall(wacom_init);
|
//late_initcall(wacom_init);
|
module_exit(wacom_exit);
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//module_i2c_driver(wacom_i2c_driver);
|
|
MODULE_AUTHOR("Tatsunosuke Tobita <tobita.tatsunosuke@wacom.co.jp>");
|
MODULE_DESCRIPTION("WACOM EMR I2C Driver");
|
MODULE_LICENSE("GPL");
|
