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* ideapad_acpi.c - Lenovo IdeaPad ACPI Extras
*
* Copyright © 2010 Intel Corporation
* Copyright © 2010 David Woodhouse <dwmw2@infradead.org>
*
* 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 2 of the License, or
* (at your option) any later version.
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/types.h>
#include <acpi/acpi_bus.h>
#include <acpi/acpi_drivers.h>
#include <linux/rfkill.h>
#define IDEAPAD_DEV_CAMERA 0
#define IDEAPAD_DEV_WLAN 1
#define IDEAPAD_DEV_BLUETOOTH 2
#define IDEAPAD_DEV_3G 3
#define IDEAPAD_DEV_KILLSW 4
struct ideapad_private {
acpi_handle handle;
struct rfkill *rfk[5];
} *ideapad_priv;
static struct {
char *name;
int cfgbit;
int opcode;
int type;
} ideapad_rfk_data[] = {
{ "ideapad_camera", 19, 0x1E, NUM_RFKILL_TYPES },
{ "ideapad_wlan", 18, 0x15, RFKILL_TYPE_WLAN },
{ "ideapad_bluetooth", 16, 0x17, RFKILL_TYPE_BLUETOOTH },
{ "ideapad_3g", 17, 0x20, RFKILL_TYPE_WWAN },
{ "ideapad_killsw", 0, 0, RFKILL_TYPE_WLAN }
};
static bool no_bt_rfkill;
module_param(no_bt_rfkill, bool, 0444);
MODULE_PARM_DESC(no_bt_rfkill, "No rfkill for bluetooth.");
/*
* ACPI Helpers
*/
#define IDEAPAD_EC_TIMEOUT (100) /* in ms */
static int read_method_int(acpi_handle handle, const char *method, int *val)
{
acpi_status status;
unsigned long long result;
status = acpi_evaluate_integer(handle, (char *)method, NULL, &result);
if (ACPI_FAILURE(status)) {
*val = -1;
return -1;
} else {
*val = result;
return 0;
}
}
static int method_vpcr(acpi_handle handle, int cmd, int *ret)
{
acpi_status status;
unsigned long long result;
struct acpi_object_list params;
union acpi_object in_obj;
params.count = 1;
params.pointer = &in_obj;
in_obj.type = ACPI_TYPE_INTEGER;
in_obj.integer.value = cmd;
status = acpi_evaluate_integer(handle, "VPCR", ¶ms, &result);
if (ACPI_FAILURE(status)) {
*ret = -1;
return -1;
} else {
*ret = result;
return 0;
}
}
static int method_vpcw(acpi_handle handle, int cmd, int data)
{
struct acpi_object_list params;
union acpi_object in_obj[2];
acpi_status status;
params.count = 2;
params.pointer = in_obj;
in_obj[0].type = ACPI_TYPE_INTEGER;
in_obj[0].integer.value = cmd;
in_obj[1].type = ACPI_TYPE_INTEGER;
in_obj[1].integer.value = data;
status = acpi_evaluate_object(handle, "VPCW", ¶ms, NULL);
if (status != AE_OK)
return -1;
return 0;
}
static int read_ec_data(acpi_handle handle, int cmd, unsigned long *data)
{
int val;
unsigned long int end_jiffies;
if (method_vpcw(handle, 1, cmd))
return -1;
for (end_jiffies = jiffies+(HZ)*IDEAPAD_EC_TIMEOUT/1000+1;
time_before(jiffies, end_jiffies);) {
schedule();
if (method_vpcr(handle, 1, &val))
return -1;
if (val == 0) {
if (method_vpcr(handle, 0, &val))
return -1;
*data = val;
return 0;
}
}
pr_err("timeout in read_ec_cmd\n");
return -1;
}
static int write_ec_cmd(acpi_handle handle, int cmd, unsigned long data)
{
int val;
unsigned long int end_jiffies;
if (method_vpcw(handle, 0, data))
return -1;
if (method_vpcw(handle, 1, cmd))
return -1;
for (end_jiffies = jiffies+(HZ)*IDEAPAD_EC_TIMEOUT/1000+1;
time_before(jiffies, end_jiffies);) {
schedule();
if (method_vpcr(handle, 1, &val))
return -1;
if (val == 0)
return 0;
}
pr_err("timeout in write_ec_cmd\n");
return -1;
}
/* the above is ACPI helpers */
static ssize_t show_ideapad_cam(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct ideapad_private *priv = dev_get_drvdata(dev);
acpi_handle handle = priv->handle;
unsigned long result;
if (read_ec_data(handle, 0x1D, &result))
return sprintf(buf, "-1\n");
return sprintf(buf, "%lu\n", result);
}
static ssize_t store_ideapad_cam(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct ideapad_private *priv = dev_get_drvdata(dev);
acpi_handle handle = priv->handle;
int ret, state;
if (!count)
return 0;
if (sscanf(buf, "%i", &state) != 1)
return -EINVAL;
ret = write_ec_cmd(handle, 0x1E, state);
if (ret < 0)
return ret;
return count;
}
static DEVICE_ATTR(camera_power, 0644, show_ideapad_cam, store_ideapad_cam);
static int ideapad_rfk_set(void *data, bool blocked)
{
int device = (unsigned long)data;
if (device == IDEAPAD_DEV_KILLSW)
return -EINVAL;
return write_ec_cmd(ideapad_priv->handle,
ideapad_rfk_data[device].opcode,
!blocked);
}
static struct rfkill_ops ideapad_rfk_ops = {
.set_block = ideapad_rfk_set,
};
static void ideapad_sync_rfk_state(struct acpi_device *adevice)
{
struct ideapad_private *priv = dev_get_drvdata(&adevice->dev);
acpi_handle handle = priv->handle;
unsigned long hw_blocked;
int i;
if (read_ec_data(handle, 0x23, &hw_blocked))
return;
hw_blocked = !hw_blocked;
for (i = IDEAPAD_DEV_WLAN; i <= IDEAPAD_DEV_KILLSW; i++)
if (priv->rfk[i])
rfkill_set_hw_state(priv->rfk[i], hw_blocked);
}
static int ideapad_register_rfkill(struct acpi_device *adevice, int dev)
{
struct ideapad_private *priv = dev_get_drvdata(&adevice->dev);
int ret;
unsigned long sw_blocked;
if (no_bt_rfkill &&
(ideapad_rfk_data[dev].type == RFKILL_TYPE_BLUETOOTH)) {
/* Force to enable bluetooth when no_bt_rfkill=1 */
write_ec_cmd(ideapad_priv->handle,
ideapad_rfk_data[dev].opcode, 1);
return 0;
}
priv->rfk[dev] = rfkill_alloc(ideapad_rfk_data[dev].name, &adevice->dev,
ideapad_rfk_data[dev].type, &ideapad_rfk_ops,
(void *)(long)dev);
if (!priv->rfk[dev])
return -ENOMEM;
if (read_ec_data(ideapad_priv->handle, ideapad_rfk_data[dev].opcode-1,
&sw_blocked)) {
rfkill_init_sw_state(priv->rfk[dev], 0);
} else {
sw_blocked = !sw_blocked;
rfkill_init_sw_state(priv->rfk[dev], sw_blocked);
}
ret = rfkill_register(priv->rfk[dev]);
if (ret) {
rfkill_destroy(priv->rfk[dev]);
return ret;
}
return 0;
}
static void ideapad_unregister_rfkill(struct acpi_device *adevice, int dev)
{
struct ideapad_private *priv = dev_get_drvdata(&adevice->dev);
if (!priv->rfk[dev])
return;
rfkill_unregister(priv->rfk[dev]);
rfkill_destroy(priv->rfk[dev]);
}
static const struct acpi_device_id ideapad_device_ids[] = {
{ "VPC2004", 0},
{ "", 0},
};
MODULE_DEVICE_TABLE(acpi, ideapad_device_ids);
static int ideapad_acpi_add(struct acpi_device *adevice)
{
int i, cfg;
int devs_present[5];
struct ideapad_private *priv;
if (read_method_int(adevice->handle, "_CFG", &cfg))
return -ENODEV;
for (i = IDEAPAD_DEV_CAMERA; i < IDEAPAD_DEV_KILLSW; i++) {
if (test_bit(ideapad_rfk_data[i].cfgbit, (unsigned long *)&cfg))
devs_present[i] = 1;
else
devs_present[i] = 0;
}
/* The hardware switch is always present */
devs_present[IDEAPAD_DEV_KILLSW] = 1;
priv = kzalloc(sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
if (devs_present[IDEAPAD_DEV_CAMERA]) {
int ret = device_create_file(&adevice->dev, &dev_attr_camera_power);
if (ret) {
kfree(priv);
return ret;
}
}
priv->handle = adevice->handle;
dev_set_drvdata(&adevice->dev, priv);
ideapad_priv = priv;
for (i = IDEAPAD_DEV_WLAN; i <= IDEAPAD_DEV_KILLSW; i++) {
if (!devs_present[i])
continue;
ideapad_register_rfkill(adevice, i);
}
ideapad_sync_rfk_state(adevice);
return 0;
}
static int ideapad_acpi_remove(struct acpi_device *adevice, int type)
{
struct ideapad_private *priv = dev_get_drvdata(&adevice->dev);
int i;
device_remove_file(&adevice->dev, &dev_attr_camera_power);
for (i = IDEAPAD_DEV_WLAN; i <= IDEAPAD_DEV_KILLSW; i++)
ideapad_unregister_rfkill(adevice, i);
dev_set_drvdata(&adevice->dev, NULL);
kfree(priv);
return 0;
}
static void ideapad_acpi_notify(struct acpi_device *adevice, u32 event)
{
acpi_handle handle = adevice->handle;
unsigned long vpc1, vpc2, vpc_bit;
if (read_ec_data(handle, 0x10, &vpc1))
return;
if (read_ec_data(handle, 0x1A, &vpc2))
return;
vpc1 = (vpc2 << 8) | vpc1;
for (vpc_bit = 0; vpc_bit < 16; vpc_bit++) {
if (test_bit(vpc_bit, &vpc1)) {
if (vpc_bit == 9)
ideapad_sync_rfk_state(adevice);
}
}
}
static struct acpi_driver ideapad_acpi_driver = {
.name = "ideapad_acpi",
.class = "IdeaPad",
.ids = ideapad_device_ids,
.ops.add = ideapad_acpi_add,
.ops.remove = ideapad_acpi_remove,
.ops.notify = ideapad_acpi_notify,
.owner = THIS_MODULE,
};
static int __init ideapad_acpi_module_init(void)
{
acpi_bus_register_driver(&ideapad_acpi_driver);
return 0;
}
static void __exit ideapad_acpi_module_exit(void)
{
acpi_bus_unregister_driver(&ideapad_acpi_driver);
}
MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
MODULE_DESCRIPTION("IdeaPad ACPI Extras");
MODULE_LICENSE("GPL");
module_init(ideapad_acpi_module_init);
module_exit(ideapad_acpi_module_exit);
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