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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* ideapad-laptop.h - Lenovo IdeaPad ACPI Extras
*
* Copyright © 2010 Intel Corporation
* Copyright © 2010 David Woodhouse <dwmw2@infradead.org>
*/
#ifndef _IDEAPAD_LAPTOP_H_
#define _IDEAPAD_LAPTOP_H_
#include <linux/acpi.h>
#include <linux/jiffies.h>
#include <linux/errno.h>
enum {
VPCCMD_R_VPC1 = 0x10,
VPCCMD_R_BL_MAX,
VPCCMD_R_BL,
VPCCMD_W_BL,
VPCCMD_R_WIFI,
VPCCMD_W_WIFI,
VPCCMD_R_BT,
VPCCMD_W_BT,
VPCCMD_R_BL_POWER,
VPCCMD_R_NOVO,
VPCCMD_R_VPC2,
VPCCMD_R_TOUCHPAD,
VPCCMD_W_TOUCHPAD,
VPCCMD_R_CAMERA,
VPCCMD_W_CAMERA,
VPCCMD_R_3G,
VPCCMD_W_3G,
VPCCMD_R_ODD, /* 0x21 */
VPCCMD_W_FAN,
VPCCMD_R_RF,
VPCCMD_W_RF,
VPCCMD_W_YMC = 0x2A,
VPCCMD_R_FAN = 0x2B,
VPCCMD_R_SPECIAL_BUTTONS = 0x31,
VPCCMD_W_BL_POWER = 0x33,
};
static inline int eval_int_with_arg(acpi_handle handle, const char *name, unsigned long arg, unsigned long *res)
{
struct acpi_object_list params;
unsigned long long result;
union acpi_object in_obj;
acpi_status status;
params.count = 1;
params.pointer = &in_obj;
in_obj.type = ACPI_TYPE_INTEGER;
in_obj.integer.value = arg;
status = acpi_evaluate_integer(handle, (char *)name, ¶ms, &result);
if (ACPI_FAILURE(status))
return -EIO;
if (res)
*res = result;
return 0;
}
static inline int eval_vpcr(acpi_handle handle, unsigned long cmd, unsigned long *res)
{
return eval_int_with_arg(handle, "VPCR", cmd, res);
}
static inline int eval_vpcw(acpi_handle handle, unsigned long cmd, unsigned long 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 (ACPI_FAILURE(status))
return -EIO;
return 0;
}
#define IDEAPAD_EC_TIMEOUT 200 /* in ms */
static inline int read_ec_data(acpi_handle handle, unsigned long cmd, unsigned long *data)
{
unsigned long end_jiffies, val;
int err;
err = eval_vpcw(handle, 1, cmd);
if (err)
return err;
end_jiffies = jiffies + msecs_to_jiffies(IDEAPAD_EC_TIMEOUT) + 1;
while (time_before(jiffies, end_jiffies)) {
schedule();
err = eval_vpcr(handle, 1, &val);
if (err)
return err;
if (val == 0)
return eval_vpcr(handle, 0, data);
}
acpi_handle_err(handle, "timeout in %s\n", __func__);
return -ETIMEDOUT;
}
static inline int write_ec_cmd(acpi_handle handle, unsigned long cmd, unsigned long data)
{
unsigned long end_jiffies, val;
int err;
err = eval_vpcw(handle, 0, data);
if (err)
return err;
err = eval_vpcw(handle, 1, cmd);
if (err)
return err;
end_jiffies = jiffies + msecs_to_jiffies(IDEAPAD_EC_TIMEOUT) + 1;
while (time_before(jiffies, end_jiffies)) {
schedule();
err = eval_vpcr(handle, 1, &val);
if (err)
return err;
if (val == 0)
return 0;
}
acpi_handle_err(handle, "timeout in %s\n", __func__);
return -ETIMEDOUT;
}
#undef IDEAPAD_EC_TIMEOUT
#endif /* !_IDEAPAD_LAPTOP_H_ */
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