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/* Copyright (c) 2013, The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/of.h>
#include <linux/input.h>
#include <linux/input/gen_vkeys.h>
#define MAX_BUF_SIZE 256
#define VKEY_VER_CODE "0x01"
#define HEIGHT_SCALE_NUM 8
#define HEIGHT_SCALE_DENOM 10
#define VKEY_Y_OFFSET_DEFAULT 0
/* numerator and denomenator for border equations */
#define BORDER_ADJUST_NUM 3
#define BORDER_ADJUST_DENOM 4
static struct kobject *vkey_obj;
static char *vkey_buf;
static ssize_t vkey_show(struct kobject *obj,
struct kobj_attribute *attr, char *buf)
{
strlcpy(buf, vkey_buf, MAX_BUF_SIZE);
return strnlen(buf, MAX_BUF_SIZE);
}
static struct kobj_attribute vkey_obj_attr = {
.attr = {
.mode = S_IRUGO,
},
.show = vkey_show,
};
static struct attribute *vkey_attr[] = {
&vkey_obj_attr.attr,
NULL,
};
static struct attribute_group vkey_grp = {
.attrs = vkey_attr,
};
static int vkey_parse_dt(struct device *dev,
struct vkeys_platform_data *pdata)
{
struct device_node *np = dev->of_node;
struct property *prop;
int rc, val;
rc = of_property_read_string(np, "label", &pdata->name);
if (rc) {
dev_err(dev, "Failed to read label\n");
return -EINVAL;
}
rc = of_property_read_u32(np, "qcom,disp-maxx", &pdata->disp_maxx);
if (rc) {
dev_err(dev, "Failed to read display max x\n");
return -EINVAL;
}
rc = of_property_read_u32(np, "qcom,disp-maxy", &pdata->disp_maxy);
if (rc) {
dev_err(dev, "Failed to read display max y\n");
return -EINVAL;
}
rc = of_property_read_u32(np, "qcom,panel-maxx", &pdata->panel_maxx);
if (rc) {
dev_err(dev, "Failed to read panel max x\n");
return -EINVAL;
}
rc = of_property_read_u32(np, "qcom,panel-maxy", &pdata->panel_maxy);
if (rc) {
dev_err(dev, "Failed to read panel max y\n");
return -EINVAL;
}
prop = of_find_property(np, "qcom,key-codes", NULL);
if (prop) {
pdata->num_keys = prop->length / sizeof(u32);
pdata->keycodes = devm_kzalloc(dev,
sizeof(u32) * pdata->num_keys, GFP_KERNEL);
if (!pdata->keycodes)
return -ENOMEM;
rc = of_property_read_u32_array(np, "qcom,key-codes",
pdata->keycodes, pdata->num_keys);
if (rc) {
dev_err(dev, "Failed to read key codes\n");
return -EINVAL;
}
}
pdata->y_offset = VKEY_Y_OFFSET_DEFAULT;
rc = of_property_read_u32(np, "qcom,y-offset", &val);
if (!rc)
pdata->y_offset = val;
else if (rc != -EINVAL) {
dev_err(dev, "Failed to read y position offset\n");
return rc;
}
return 0;
}
static int vkeys_probe(struct platform_device *pdev)
{
struct vkeys_platform_data *pdata;
int width, height, center_x, center_y;
int x1 = 0, x2 = 0, i, c = 0, ret, border;
char *name;
vkey_buf = devm_kzalloc(&pdev->dev, MAX_BUF_SIZE, GFP_KERNEL);
if (!vkey_buf) {
dev_err(&pdev->dev, "Failed to allocate memory\n");
return -ENOMEM;
}
if (pdev->dev.of_node) {
pdata = devm_kzalloc(&pdev->dev,
sizeof(struct vkeys_platform_data), GFP_KERNEL);
if (!pdata) {
dev_err(&pdev->dev, "Failed to allocate memory\n");
return -ENOMEM;
}
ret = vkey_parse_dt(&pdev->dev, pdata);
if (ret) {
dev_err(&pdev->dev, "Parsing DT failed(%d)", ret);
return ret;
}
} else
pdata = pdev->dev.platform_data;
if (!pdata || !pdata->name || !pdata->keycodes || !pdata->num_keys ||
!pdata->disp_maxx || !pdata->disp_maxy || !pdata->panel_maxy) {
dev_err(&pdev->dev, "pdata is invalid\n");
return -EINVAL;
}
border = (pdata->panel_maxx - pdata->disp_maxx) * 2;
width = ((pdata->disp_maxx - (border * (pdata->num_keys - 1)))
/ pdata->num_keys);
height = (pdata->panel_maxy - pdata->disp_maxy);
center_y = pdata->disp_maxy + (height / 2) + pdata->y_offset;
height = height * HEIGHT_SCALE_NUM / HEIGHT_SCALE_DENOM;
x2 -= border * BORDER_ADJUST_NUM / BORDER_ADJUST_DENOM;
for (i = 0; i < pdata->num_keys; i++) {
x1 = x2 + border;
x2 = x2 + border + width;
center_x = x1 + (x2 - x1) / 2;
c += snprintf(vkey_buf + c, MAX_BUF_SIZE - c,
"%s:%d:%d:%d:%d:%d\n",
VKEY_VER_CODE, pdata->keycodes[i],
center_x, center_y, width, height);
}
vkey_buf[c] = '\0';
name = devm_kzalloc(&pdev->dev, sizeof(*name) * MAX_BUF_SIZE,
GFP_KERNEL);
if (!name)
return -ENOMEM;
snprintf(name, MAX_BUF_SIZE,
"virtualkeys.%s", pdata->name);
vkey_obj_attr.attr.name = name;
vkey_obj = kobject_create_and_add("board_properties", NULL);
if (!vkey_obj) {
dev_err(&pdev->dev, "unable to create kobject\n");
return -ENOMEM;
}
ret = sysfs_create_group(vkey_obj, &vkey_grp);
if (ret) {
dev_err(&pdev->dev, "failed to create attributes\n");
goto destroy_kobj;
}
return 0;
destroy_kobj:
kobject_put(vkey_obj);
return ret;
}
static int vkeys_remove(struct platform_device *pdev)
{
sysfs_remove_group(vkey_obj, &vkey_grp);
kobject_put(vkey_obj);
return 0;
}
static struct of_device_id vkey_match_table[] = {
{ .compatible = "qcom,gen-vkeys",},
{ },
};
static struct platform_driver vkeys_driver = {
.probe = vkeys_probe,
.remove = vkeys_remove,
.driver = {
.owner = THIS_MODULE,
.name = "gen_vkeys",
.of_match_table = vkey_match_table,
},
};
module_platform_driver(vkeys_driver);
MODULE_LICENSE("GPL v2");
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