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