From: Tatsunosuke Tobita <tobita.tatsunosuke@xxxxxxxxxxx>
This adds a driver support for Wacom Stylus Device with I2C interface.
Signed-off-by: Tatsunosuke Tobita <tobita.tatsunosuke@xxxxxxxxxxx>
---
drivers/input/touchscreen/wacom_i2c.c | 244 +++++++++++++++++++++++++++++++++
drivers/input/touchscreen/wacom_i2c.h | 55 ++++++++
2 files changed, 299 insertions(+), 0 deletions(-)
create mode 100644 drivers/input/touchscreen/wacom_i2c.c
create mode 100644 drivers/input/touchscreen/wacom_i2c.h
diff --git a/drivers/input/touchscreen/wacom_i2c.c b/drivers/input/touchscreen/wacom_i2c.c
new file mode 100644
index 0000000..2da4a3b
--- /dev/null
+++ b/drivers/input/touchscreen/wacom_i2c.c
@@ -0,0 +1,244 @@
+/*
+ * Wacom Penabled Driver for I2C
+ *
+ * Copyright (c) 2011 Tatsunosuke Tobita, Wacom.
+ * <tobita.tatsunosuke@xxxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it
+ * and/or modify it under the terms of the GNU General
+ * Public License as published by the Free Software
+ * Foundation; either version of 2 of the License,
+ * or (at your option) any later version.
+ */
+
+#include "wacom_i2c.h"
+
+static int wacom_send_query(struct wacom_i2c *wac_i2c)
+{
+ int ret;
+ u8 cmd[4] = {CMD_QUERY0, CMD_QUERY1, CMD_QUERY2, CMD_QUERY3};
+ u8 data[COM_COORD_NUM];
+
+ ret = i2c_master_send(wac_i2c->client, cmd, sizeof(cmd));
+ if (ret < 0) {
+ dev_printk(KERN_ERR, &wac_i2c->client->dev,
+ "Sending 1st Query failed \n");
+ return -1;
+ }
+
+ cmd[0] = CMD_THROW0; cmd[1] = CMD_THROW1;
+ ret = i2c_master_send(wac_i2c->client, cmd, 2);
+ if (ret < 0) {
+ dev_printk(KERN_ERR, &wac_i2c->client->dev,
+ "Sending 2nd Query failed \n");
+ return -1;
+ }
+
+ ret = i2c_master_recv(wac_i2c->client, data, QUERY_SIZE);
+ if (ret < 0) {
+ dev_printk(KERN_ERR, &wac_i2c->client->dev,
+ "Receiving data failed 1\n");
+ return -1;
+ }
+
+ wac_i2c->wac_feature.x_max = get_unaligned_le16(&data[3]);
+ wac_i2c->wac_feature.y_max = get_unaligned_le16(&data[5]);
+ wac_i2c->wac_feature.pressure_max = get_unaligned_le16(&data[11]);
+ wac_i2c->wac_feature.fw_version = get_unaligned_le16(&data[13]);
+
+ dev_dbg(&wac_i2c->client->dev,
+ "x_max:%d, y_max:%d, pressure:%d, fw:%d\n",
+ wac_i2c->wac_feature.x_max, wac_i2c->wac_feature.y_max,
+ wac_i2c->wac_feature.pressure_max, wac_i2c->wac_feature.fw_version);
+
+ return 0;
+}
+
+static irqreturn_t wacom_i2c_irq(int irqno, void *param)
+{
+ struct wacom_i2c *wac_i2c = param;
+ int ret;
+ unsigned int x, y, pressure;
+ unsigned char tsw, f1, f2, ers;
+ u8 data[COM_COORD_NUM];
+
+ do {
+ ret = i2c_master_recv(wac_i2c->client, data, QUERY_SIZE);
+ } while (gpio_get_value(irq_to_gpio(wac_i2c->client->irq)) == 0);
+
+ if (ret > 0) {
+ tsw = data[3]&0x01;
+ ers = data[3]&0x04;
+ f1 = data[3]&0x02;
+ f2 = data[3]&0x10;
+ x = le16_to_cpup((__le16 *)&data[4]);
+ y = le16_to_cpup((__le16 *)&data[6]);
+ pressure = le16_to_cpup((__le16 *)&data[8]);
+
+ input_report_abs(wac_i2c->input, ABS_X, x);
+ input_report_abs(wac_i2c->input, ABS_Y, y);
+ input_report_key(wac_i2c->input, BTN_TOOL_PEN, tsw);
+ input_report_key(wac_i2c->input, BTN_TOOL_RUBBER, ers);
+ input_report_abs(wac_i2c->input, ABS_PRESSURE, pressure);
+ input_report_key(wac_i2c->input, BTN_TOUCH, (tsw || ers));
+ input_report_key(wac_i2c->input, BTN_STYLUS, f1);
+ input_report_key(wac_i2c->input, BTN_STYLUS2, f2);
+
+ input_sync(wac_i2c->input);
+ }
+
+ return IRQ_HANDLED;
+}
+
+static int wacom_i2c_input_open(struct input_dev *dev)
+{
+ struct wacom_i2c *wac_i2c = input_get_drvdata(dev);
+ int ret;
+ ret = wacom_send_query(wac_i2c);
+ if (ret < 0)
+ return -EIO;
+
+ wac_i2c->input->id.version = wac_i2c->wac_feature.fw_version;
+ input_set_abs_params(wac_i2c->input, ABS_X, 0,
+ wac_i2c->wac_feature.x_max, 0, 0);
+ input_set_abs_params(wac_i2c->input, ABS_Y, 0,
+ wac_i2c->wac_feature.y_max, 0, 0);
+ input_set_abs_params(wac_i2c->input, ABS_PRESSURE, 0,
+ wac_i2c->wac_feature.pressure_max, 0, 0);
+
+ return 0;
+}
+
+static void wacom_i2c_input_close(struct input_dev *dev)
+{
+}
+
+static int __devinit wacom_i2c_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct wacom_i2c *wac_i2c;
+ int ret, err;
+ u8 data[COM_COORD_NUM];
+
+ if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
+ err = -EIO;
+ goto fail1;
+ }
+
+ wac_i2c = kzalloc(sizeof(*wac_i2c), GFP_KERNEL);
+ wac_i2c->input = input_allocate_device();
+ if (wac_i2c == NULL || wac_i2c->input == NULL) {
+ err = -ENOMEM;
+ goto fail2;
+ }
+ wac_i2c->client = client;
+ i2c_set_clientdata(client, wac_i2c);
+ mutex_init(&wac_i2c->lock);
+
+ __set_bit(BTN_TOOL_PEN, wac_i2c->input->keybit);
+ __set_bit(BTN_TOOL_RUBBER, wac_i2c->input->keybit);
+ __set_bit(BTN_STYLUS, wac_i2c->input->keybit);
+ __set_bit(BTN_STYLUS2, wac_i2c->input->keybit);
+ __set_bit(BTN_TOUCH, wac_i2c->input->keybit);
+
+ wac_i2c->input->name = "Wacom I2C Digitizer";
+ wac_i2c->input->id.bustype = BUS_I2C;
+ wac_i2c->input->id.vendor = 0x56a;
+ wac_i2c->input->dev.parent = &client->dev;
+ wac_i2c->input->open = wacom_i2c_input_open;
+ wac_i2c->input->close = wacom_i2c_input_close;
+ wac_i2c->input->evbit[0] |= BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
+ input_set_drvdata(wac_i2c->input, wac_i2c);
+
+ if (input_register_device(wac_i2c->input)) {
+ dev_printk(KERN_ERR, &wac_i2c->client->dev, "Failed to register input device \n");
+ err = -ENODEV;
+ goto fail3;
+ }
+
+
+ ret = request_threaded_irq(wac_i2c->client->irq, NULL,
+ wacom_i2c_irq, IRQF_TRIGGER_FALLING, "WACOM_I2C_IRQ", wac_i2c);
+ if (ret) {
+ dev_printk(KERN_ERR, &wac_i2c->client->dev, "Failed to enable IRQ for EMR \n");
+ return ret;
+ }
+
+ /*Clear the buffer in the firmware*/
+ do {
+ ret = i2c_master_recv(wac_i2c->client, data, QUERY_SIZE);
+ } while (gpio_get_value(irq_to_gpio(wac_i2c->client->irq)) == 0);
+
+ return 0;
+
+ fail3:
+ input_free_device(wac_i2c->input);
+ fail2:
+ dev_err(&wac_i2c->client->dev, "Freeing device \n");
+ fail1:
+ return err;
+}
+
+static int __devexit wacom_i2c_remove(struct i2c_client *client)
+{
+ struct wacom_i2c *wac_i2c = i2c_get_clientdata(client);
+
+ free_irq(wac_i2c->client->irq, wac_i2c);
+ input_unregister_device(wac_i2c->input);
+ kfree(wac_i2c);
+
+ return 0;
+}
+
+static int wacom_i2c_suspend(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ disable_irq(client->irq);
+
+ return 0;
+}
+
+static int wacom_i2c_resume(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ enable_irq(client->irq);
+
+ return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(wacom_i2c_pm, wacom_i2c_suspend, wacom_i2c_resume);
+
+static const struct i2c_device_id wacom_i2c_id[] = {
+ {WACNAME, 0},
+ {},
+};
+MODULE_DEVICE_TABLE(i2c, wacom_i2c_id);
+
+static struct i2c_driver wacom_i2c_driver = {
+ .driver = {
+ .name = "wacom_i2c",
+ .owner = THIS_MODULE,
+ .pm = &wacom_i2c_pm,
+ },
+
+ .probe = wacom_i2c_probe,
+ .remove = __devexit_p(wacom_i2c_remove),
+ .id_table = wacom_i2c_id,
+};
+
+static int __init wacom_i2c_init(void)
+{
+ return i2c_add_driver(&wacom_i2c_driver);
+}
+
+static void __exit wacom_i2c_exit(void)
+{
+ i2c_del_driver(&wacom_i2c_driver);
+}
+
+module_init(wacom_i2c_init);
+module_exit(wacom_i2c_exit);
+
+MODULE_AUTHOR("Tatsunosuke Tobita <tobita.tatsunosuke@xxxxxxxxxxx>");
+MODULE_DESCRIPTION("WACOM EMR I2C Driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/input/touchscreen/wacom_i2c.h b/drivers/input/touchscreen/wacom_i2c.h
new file mode 100644
index 0000000..b5c2d07
--- /dev/null
+++ b/drivers/input/touchscreen/wacom_i2c.h
@@ -0,0 +1,55 @@
+/*
+ * Wacom Penabled Driver for I2C
+ *
+ * Copyright (c) 2011 Tatsunosuke Tobita, Wacom.
+ * <tobita.tatsunosuke@xxxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it
+ * and/or modify it under the terms of the GNU General
+ * Public License as published by the Free Software
+ * Foundation; either version of 2 of the License,
+ * or (at your option) any later version.
+ */
+
+#ifndef WACOM_I2C_H
+#define WACOM_I2C_H
+
+#include <linux/module.h>
+#include <linux/input.h>
+#include <linux/i2c.h>
+#include <linux/slab.h>
+#include <linux/irq.h>
+#include <linux/interrupt.h>
+#include <linux/gpio.h>
+#include <asm/unaligned.h>
+
+#define NAMEBUF 12
+#define WACNAME "WAC_I2C_EMR"
+
+/*Wacom Command*/
+#define COM_COORD_NUM 128
+#define CMD_QUERY0 0x04
+#define CMD_QUERY1 0x00
+#define CMD_QUERY2 0x33
+#define CMD_QUERY3 0x02
+#define CMD_THROW0 0x05
+#define CMD_THROW1 0x00
+#define QUERY_SIZE 19
+
+/*Parameters for wacom own features*/
+struct wacom_features {
+ int x_max;
+ int y_max;
+ int pressure_max;
+ char fw_version;
+};
+
+/*Parameters for i2c driver*/
+struct wacom_i2c {
+ struct i2c_client *client;
+ struct input_dev *input;
+ struct mutex lock;
+ struct wacom_features wac_feature;
+ int type;
+};
+#endif
--
1.7.1
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