int wacom_checksum(struct wacom_i2c *wac_i2c)
{
int ret = 0, retry = 10;
int i = 0;
u8 buf[5] = {0, };
buf[0] = COM_CHECKSUM;
while (retry--) {
ret = wacom_i2c_send(wac_i2c, &buf[0], 1, false);
if (ret < 0) {
printk(KERN_DEBUG
"[E-PEN] i2c fail, retry, %d\n",
__LINE__);
continue;
}
msleep(200);
ret = wacom_i2c_recv(wac_i2c, buf, 5, false);
if (ret < 0) {
printk(KERN_DEBUG
"[E-PEN] i2c fail, retry, %d\n",
__LINE__);
continue;
} else if (buf[0] == 0x1f)
break;
printk(KERN_DEBUG "[E-PEN] checksum retry\n");
}
if (ret >= 0) {
printk(KERN_DEBUG
"[E-PEN] received checksum %x, %x, %x, %x, %x\n",
buf[0], buf[1], buf[2], buf[3], buf[4]);
}
for (i = 0; i < 5; ++i) {
if (buf[i] != Firmware_checksum[i]) {
printk(KERN_DEBUG
"[E-PEN] checksum fail %dth %x %x\n", i,
buf[i], Firmware_checksum[i]);
break;
}
}
wac_i2c->checksum_result = (5 == i);
#ifdef WACOM_CONNECTION_CHECK
if (!wac_i2c->connection_check)
wacom_open_test(wac_i2c);
#endif
return ret;
}
static ssize_t epen_connection_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct wacom_i2c *wac_i2c = dev_get_drvdata(dev);
printk(KERN_DEBUG"epen:%s\n", __func__);
wacom_open_test(wac_i2c);
printk(KERN_DEBUG
"epen:connection_check : %d\n",
wac_i2c->connection_check);
return sprintf(buf, "%s\n",
wac_i2c->connection_check ?
"OK" : "NG");
}
