// 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-1s 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 2nd accel sits in the base of 2-in-1s. 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"}, {"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 = ACPI_PTR(bmc150_accel_acpi_match), .pm = &bmc150_accel_pm_ops, }, .probe_new = 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);