![Dmitry Torokhov](/assets/img/avatar_default.png)
Apparently GCC can't figure out that we bail if we fail to query device and will not try to use 'features': drivers/input/touchscreen/wacom_i2c.c: In function ‘wacom_i2c_probe’: drivers/input/touchscreen/wacom_i2c.c:177:20: warning: ‘features.fw_version’ may be used uninitialized in this function [-Wmaybe-uninitialized] Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
283 lines
6.5 KiB
C
283 lines
6.5 KiB
C
/*
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* Wacom Penabled Driver for I2C
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*
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* Copyright (c) 2011 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 <asm/unaligned.h>
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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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#define WACOM_RETRY_CNT 100
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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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struct wacom_i2c {
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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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};
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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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dev_dbg(&client->dev,
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"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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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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u8 *data = wac_i2c->data;
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unsigned int x, y, pressure;
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unsigned char tsw, f1, f2, ers;
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int error;
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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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input_report_key(input, BTN_TOUCH, tsw || ers);
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input_report_key(input, BTN_TOOL_PEN, tsw);
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input_report_key(input, BTN_TOOL_RUBBER, ers);
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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_PRESSURE, pressure);
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input_sync(input);
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out:
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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 __devinit 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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int error;
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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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error = wacom_query_device(client, &features);
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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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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->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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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,
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0, features.pressure_max, 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_i2c", 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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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_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 __devexit 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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#ifdef CONFIG_PM_SLEEP
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static int wacom_i2c_suspend(struct device *dev)
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{
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struct i2c_client *client = to_i2c_client(dev);
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disable_irq(client->irq);
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return 0;
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}
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static int wacom_i2c_resume(struct device *dev)
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{
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struct i2c_client *client = to_i2c_client(dev);
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enable_irq(client->irq);
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return 0;
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}
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#endif
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static SIMPLE_DEV_PM_OPS(wacom_i2c_pm, wacom_i2c_suspend, wacom_i2c_resume);
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static const struct i2c_device_id wacom_i2c_id[] = {
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{ "WAC_I2C_EMR", 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 struct i2c_driver wacom_i2c_driver = {
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.driver = {
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.name = "wacom_i2c",
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.owner = THIS_MODULE,
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.pm = &wacom_i2c_pm,
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},
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.probe = wacom_i2c_probe,
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.remove = __devexit_p(wacom_i2c_remove),
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.id_table = wacom_i2c_id,
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};
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module_i2c_driver(wacom_i2c_driver);
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MODULE_AUTHOR("Tatsunosuke Tobita <tobita.tatsunosuke@wacom.co.jp>");
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MODULE_DESCRIPTION("WACOM EMR I2C Driver");
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MODULE_LICENSE("GPL");
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