// SPDX-License-Identifier: GPL-2.0-only
/*
* 3 - axis accelerometer driver supporting many I2C Bosch - Sensortec chips
* Copyright ( c ) 2014 , Intel Corporation .
*/
#include <linux/device.h>
#include <linux/mod_devicetable.h>
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/acpi.h>
#include <linux/regmap.h>
#include "bmc150-accel.h"
#ifdef CONFIG_ACPI
static const struct acpi_device_id bmc150_acpi_dual_accel_ids[] = {
{"BOSC0200" },
{"DUAL250E" },
{ }
};
/*
* The DUAL250E ACPI device for 360 ° hinges type 2 - in - 1 s with 1 accelerometer
* in the display and 1 in the hinge has an ACPI - method ( DSM ) to tell the
* ACPI code about the angle between the 2 halves . This will make the ACPI
* code enable / disable the keyboard and touchpad . We need to call this to avoid
* the keyboard being disabled when the 2 - in - 1 is turned - on or resumed while
* fully folded into tablet mode ( which gets detected with a HALL - sensor ) .
* If we don ' t call this then the keyboard won ' t work even when the 2 - in - 1 is
* changed to be used in laptop mode after the power - on / resume .
*
* This DSM takes 2 angles , selected by setting aux0 to 0 or 1 , these presumably
* define the angle between the gravity vector measured by the accelerometer in
* the display ( aux0 = 0 ) resp . the base ( aux0 = 1 ) and some reference vector .
* The 2 angles get subtracted from each other so the reference vector does
* not matter and we can simply leave the second angle at 0 .
*/
#define BMC150_DSM_GUID "7681541e-8827-4239-8d9d-36be7fe12542"
#define DUAL250E_SET_ANGLE_FN_INDEX 3
struct dual250e_set_angle_args {
u32 aux0;
u32 ang0;
u32 rawx;
u32 rawy;
u32 rawz;
} __packed;
static bool bmc150_acpi_set_angle_dsm(struct i2c_client *client, u32 aux0, u32 ang0)
{
struct acpi_device *adev = ACPI_COMPANION(&client->dev);
struct dual250e_set_angle_args args = {
.aux0 = aux0,
.ang0 = ang0,
};
union acpi_object args_obj, *obj;
guid_t guid;
if (!acpi_dev_hid_uid_match(adev, "DUAL250E" , NULL))
return false ;
guid_parse(BMC150_DSM_GUID, &guid);
if (!acpi_check_dsm(adev->handle, &guid, 0 , BIT(DUAL250E_SET_ANGLE_FN_INDEX)))
return false ;
/*
* Note this triggers the following warning :
* " ACPI Warning : \ _ SB . PCI0 . I2C2 . ACC1 . _ DSM : Argument # 4 type mismatch -
* Found [ Buffer ] , ACPI requires [ Package ] "
* This is unavoidable since the _ DSM implementation expects a " naked "
* buffer , so wrapping it in a package will _ not_ work .
*/
args_obj.type = ACPI_TYPE_BUFFER;
args_obj.buffer.length = sizeof (args);
args_obj.buffer.pointer = (u8 *)&args;
obj = acpi_evaluate_dsm(adev->handle, &guid, 0 , DUAL250E_SET_ANGLE_FN_INDEX, &args_obj);
if (!obj) {
dev_err(&client->dev, "Failed to call DSM to enable keyboard and touchpad\n" );
return false ;
}
ACPI_FREE(obj);
return true ;
}
static bool bmc150_acpi_enable_keyboard(struct i2c_client *client)
{
/*
* The EC must see a change for it to re - enable the kbd , so first
* set the angle to 270 ° ( tent / stand mode ) and then change it to
* 90 ° ( laptop mode ) .
*/
if (!bmc150_acpi_set_angle_dsm(client, 0 , 270 ))
return false ;
/* The EC needs some time to notice the angle being changed */
msleep(100 );
return bmc150_acpi_set_angle_dsm(client, 0 , 90 );
}
static void bmc150_acpi_resume_work(struct work_struct *work)
{
struct bmc150_accel_data *data =
container_of(work, struct bmc150_accel_data, resume_work.work);
bmc150_acpi_enable_keyboard(data->second_device);
}
static void bmc150_acpi_resume_handler(struct device *dev)
{
struct bmc150_accel_data *data = iio_priv(dev_get_drvdata(dev));
/*
* Delay the bmc150_acpi_enable_keyboard ( ) call till after the system
* resume has completed , otherwise it will not work .
*/
schedule_delayed_work(&data->resume_work, msecs_to_jiffies(1000 ));
}
/*
* Some acpi_devices describe 2 accelerometers in a single ACPI device ,
* try instantiating a second i2c_client for an I2cSerialBusV2 ACPI resource
* with index 1 .
*/
static void bmc150_acpi_dual_accel_probe(struct i2c_client *client)
{
struct bmc150_accel_data *data = iio_priv(i2c_get_clientdata(client));
struct acpi_device *adev = ACPI_COMPANION(&client->dev);
char dev_name[16 ];
struct i2c_board_info board_info = {
.type = "bmc150_accel" ,
.dev_name = dev_name,
.fwnode = client->dev.fwnode,
};
if (acpi_match_device_ids(adev, bmc150_acpi_dual_accel_ids))
return ;
/*
* The 2 nd accel sits in the base of 2 - in - 1 s . The suffix is static , as
* there should never be more then 1 ACPI node with 2 accelerometers .
*/
snprintf(dev_name, sizeof (dev_name), "%s:base" , acpi_device_hid(adev));
board_info.irq = acpi_dev_gpio_irq_get(adev, 1 );
data->second_device = i2c_acpi_new_device(&client->dev, 1 , &board_info);
if (!IS_ERR(data->second_device) && bmc150_acpi_enable_keyboard(data->second_device)) {
INIT_DELAYED_WORK(&data->resume_work, bmc150_acpi_resume_work);
data->resume_callback = bmc150_acpi_resume_handler;
}
}
static void bmc150_acpi_dual_accel_remove(struct i2c_client *client)
{
struct bmc150_accel_data *data = iio_priv(i2c_get_clientdata(client));
if (data->resume_callback)
cancel_delayed_work_sync(&data->resume_work);
i2c_unregister_device(data->second_device);
}
#else
static void bmc150_acpi_dual_accel_probe(struct i2c_client *client) {}
static void bmc150_acpi_dual_accel_remove(struct i2c_client *client) {}
#endif
static int bmc150_accel_probe(struct i2c_client *client)
{
const struct i2c_device_id *id = i2c_client_get_device_id(client);
struct regmap *regmap;
const char *name = NULL;
enum bmc150_type type = BOSCH_UNKNOWN;
bool block_supported =
i2c_check_functionality(client->adapter, I2C_FUNC_I2C) ||
i2c_check_functionality(client->adapter,
I2C_FUNC_SMBUS_READ_I2C_BLOCK);
int ret;
regmap = devm_regmap_init_i2c(client, &bmc150_regmap_conf);
if (IS_ERR(regmap)) {
dev_err(&client->dev, "Failed to initialize i2c regmap\n" );
return PTR_ERR(regmap);
}
if (id) {
name = id->name;
type = id->driver_data;
}
ret = bmc150_accel_core_probe(&client->dev, regmap, client->irq,
type, name, block_supported);
if (ret)
return ret;
/*
* The ! id check avoids recursion when probe ( ) gets called
* for the second client .
*/
if (!id && has_acpi_companion(&client->dev))
bmc150_acpi_dual_accel_probe(client);
return 0 ;
}
static void bmc150_accel_remove(struct i2c_client *client)
{
bmc150_acpi_dual_accel_remove(client);
bmc150_accel_core_remove(&client->dev);
}
static const struct acpi_device_id bmc150_accel_acpi_match[] = {
{"BMA0255" },
{"BMA0280" },
{"BMA222" },
{"BMA222E" },
{"BMA250E" },
{"BMC150A" },
{"BMI055A" },
/*
* The " BOSC0200 " identifier used here is not unique to devices using
* bmc150 . The same " BOSC0200 " identifier is found in the ACPI tables
* of the ASUS ROG ALLY and Ayaneo AIR Plus which both use a Bosch
* BMI323 chip . This creates a conflict with duplicate ACPI identifiers
* which multiple drivers want to use . Fortunately , when the bmc150
* driver starts to load on the ASUS ROG ALLY , the chip ID check
* portion fails ( correctly ) because the chip IDs received ( via i2c )
* are unique between bmc150 and bmi323 and a dmesg output similar to
* this : " bmc150_accel_i2c i2c - BOSC0200 : 00 : Invalid chip 0 " can be
* seen . This allows the bmi323 driver to take over for ASUS ROG ALLY ,
* and other devices using the bmi323 chip .
*/
{"BOSC0200" },
{"BSBA0150" },
{"DUAL250E" },
{ }
};
MODULE_DEVICE_TABLE(acpi, bmc150_accel_acpi_match);
static const struct i2c_device_id bmc150_accel_id[] = {
{"bma222" },
{"bma222e" },
{"bma250e" },
{"bma253" },
{"bma254" },
{"bma255" },
{"bma280" },
{"bmc150_accel" },
{"bmc156_accel" , BOSCH_BMC156},
{"bmi055_accel" },
{ }
};
MODULE_DEVICE_TABLE(i2c, bmc150_accel_id);
static const struct of_device_id bmc150_accel_of_match[] = {
{ .compatible = "bosch,bma222" },
{ .compatible = "bosch,bma222e" },
{ .compatible = "bosch,bma250e" },
{ .compatible = "bosch,bma253" },
{ .compatible = "bosch,bma254" },
{ .compatible = "bosch,bma255" },
{ .compatible = "bosch,bma280" },
{ .compatible = "bosch,bmc150_accel" },
{ .compatible = "bosch,bmc156_accel" },
{ .compatible = "bosch,bmi055_accel" },
{ }
};
MODULE_DEVICE_TABLE(of, bmc150_accel_of_match);
static struct i2c_driver bmc150_accel_driver = {
.driver = {
.name = "bmc150_accel_i2c" ,
.of_match_table = bmc150_accel_of_match,
.acpi_match_table = bmc150_accel_acpi_match,
.pm = &bmc150_accel_pm_ops,
},
.probe = bmc150_accel_probe,
.remove = bmc150_accel_remove,
.id_table = bmc150_accel_id,
};
module_i2c_driver(bmc150_accel_driver);
MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>" );
MODULE_LICENSE("GPL v2" );
MODULE_DESCRIPTION("BMC150 I2C accelerometer driver" );
MODULE_IMPORT_NS("IIO_BMC150" );
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