295 lines · c
1// SPDX-License-Identifier: GPL-2.0-only2/*3 * 3-axis accelerometer driver supporting many I2C Bosch-Sensortec chips4 * Copyright (c) 2014, Intel Corporation.5 */6 7#include <linux/device.h>8#include <linux/mod_devicetable.h>9#include <linux/i2c.h>10#include <linux/module.h>11#include <linux/acpi.h>12#include <linux/regmap.h>13 14#include "bmc150-accel.h"15 16#ifdef CONFIG_ACPI17static const struct acpi_device_id bmc150_acpi_dual_accel_ids[] = {18 {"BOSC0200"},19 {"DUAL250E"},20 { }21};22 23/*24 * The DUAL250E ACPI device for 360° hinges type 2-in-1s with 1 accelerometer25 * in the display and 1 in the hinge has an ACPI-method (DSM) to tell the26 * ACPI code about the angle between the 2 halves. This will make the ACPI27 * code enable/disable the keyboard and touchpad. We need to call this to avoid28 * the keyboard being disabled when the 2-in-1 is turned-on or resumed while29 * fully folded into tablet mode (which gets detected with a HALL-sensor).30 * If we don't call this then the keyboard won't work even when the 2-in-1 is31 * changed to be used in laptop mode after the power-on / resume.32 *33 * This DSM takes 2 angles, selected by setting aux0 to 0 or 1, these presumably34 * define the angle between the gravity vector measured by the accelerometer in35 * the display (aux0=0) resp. the base (aux0=1) and some reference vector.36 * The 2 angles get subtracted from each other so the reference vector does37 * not matter and we can simply leave the second angle at 0.38 */39 40#define BMC150_DSM_GUID "7681541e-8827-4239-8d9d-36be7fe12542"41#define DUAL250E_SET_ANGLE_FN_INDEX 342 43struct dual250e_set_angle_args {44 u32 aux0;45 u32 ang0;46 u32 rawx;47 u32 rawy;48 u32 rawz;49} __packed;50 51static bool bmc150_acpi_set_angle_dsm(struct i2c_client *client, u32 aux0, u32 ang0)52{53 struct acpi_device *adev = ACPI_COMPANION(&client->dev);54 struct dual250e_set_angle_args args = {55 .aux0 = aux0,56 .ang0 = ang0,57 };58 union acpi_object args_obj, *obj;59 guid_t guid;60 61 if (!acpi_dev_hid_uid_match(adev, "DUAL250E", NULL))62 return false;63 64 guid_parse(BMC150_DSM_GUID, &guid);65 66 if (!acpi_check_dsm(adev->handle, &guid, 0, BIT(DUAL250E_SET_ANGLE_FN_INDEX)))67 return false;68 69 /*70 * Note this triggers the following warning:71 * "ACPI Warning: \_SB.PCI0.I2C2.ACC1._DSM: Argument #4 type mismatch -72 * Found [Buffer], ACPI requires [Package]"73 * This is unavoidable since the _DSM implementation expects a "naked"74 * buffer, so wrapping it in a package will _not_ work.75 */76 args_obj.type = ACPI_TYPE_BUFFER;77 args_obj.buffer.length = sizeof(args);78 args_obj.buffer.pointer = (u8 *)&args;79 80 obj = acpi_evaluate_dsm(adev->handle, &guid, 0, DUAL250E_SET_ANGLE_FN_INDEX, &args_obj);81 if (!obj) {82 dev_err(&client->dev, "Failed to call DSM to enable keyboard and touchpad\n");83 return false;84 }85 86 ACPI_FREE(obj);87 return true;88}89 90static bool bmc150_acpi_enable_keyboard(struct i2c_client *client)91{92 /*93 * The EC must see a change for it to re-enable the kbd, so first94 * set the angle to 270° (tent/stand mode) and then change it to95 * 90° (laptop mode).96 */97 if (!bmc150_acpi_set_angle_dsm(client, 0, 270))98 return false;99 100 /* The EC needs some time to notice the angle being changed */101 msleep(100);102 103 return bmc150_acpi_set_angle_dsm(client, 0, 90);104}105 106static void bmc150_acpi_resume_work(struct work_struct *work)107{108 struct bmc150_accel_data *data =109 container_of(work, struct bmc150_accel_data, resume_work.work);110 111 bmc150_acpi_enable_keyboard(data->second_device);112}113 114static void bmc150_acpi_resume_handler(struct device *dev)115{116 struct bmc150_accel_data *data = iio_priv(dev_get_drvdata(dev));117 118 /*119 * Delay the bmc150_acpi_enable_keyboard() call till after the system120 * resume has completed, otherwise it will not work.121 */122 schedule_delayed_work(&data->resume_work, msecs_to_jiffies(1000));123}124 125/*126 * Some acpi_devices describe 2 accelerometers in a single ACPI device,127 * try instantiating a second i2c_client for an I2cSerialBusV2 ACPI resource128 * with index 1.129 */130static void bmc150_acpi_dual_accel_probe(struct i2c_client *client)131{132 struct bmc150_accel_data *data = iio_priv(i2c_get_clientdata(client));133 struct acpi_device *adev = ACPI_COMPANION(&client->dev);134 char dev_name[16];135 struct i2c_board_info board_info = {136 .type = "bmc150_accel",137 .dev_name = dev_name,138 .fwnode = client->dev.fwnode,139 };140 141 if (acpi_match_device_ids(adev, bmc150_acpi_dual_accel_ids))142 return;143 144 /*145 * The 2nd accel sits in the base of 2-in-1s. The suffix is static, as146 * there should never be more then 1 ACPI node with 2 accelerometers.147 */148 snprintf(dev_name, sizeof(dev_name), "%s:base", acpi_device_hid(adev));149 150 board_info.irq = acpi_dev_gpio_irq_get(adev, 1);151 152 data->second_device = i2c_acpi_new_device(&client->dev, 1, &board_info);153 154 if (!IS_ERR(data->second_device) && bmc150_acpi_enable_keyboard(data->second_device)) {155 INIT_DELAYED_WORK(&data->resume_work, bmc150_acpi_resume_work);156 data->resume_callback = bmc150_acpi_resume_handler;157 }158}159 160static void bmc150_acpi_dual_accel_remove(struct i2c_client *client)161{162 struct bmc150_accel_data *data = iio_priv(i2c_get_clientdata(client));163 164 if (data->resume_callback)165 cancel_delayed_work_sync(&data->resume_work);166 167 i2c_unregister_device(data->second_device);168}169#else170static void bmc150_acpi_dual_accel_probe(struct i2c_client *client) {}171static void bmc150_acpi_dual_accel_remove(struct i2c_client *client) {}172#endif173 174static int bmc150_accel_probe(struct i2c_client *client)175{176 const struct i2c_device_id *id = i2c_client_get_device_id(client);177 struct regmap *regmap;178 const char *name = NULL;179 enum bmc150_type type = BOSCH_UNKNOWN;180 bool block_supported =181 i2c_check_functionality(client->adapter, I2C_FUNC_I2C) ||182 i2c_check_functionality(client->adapter,183 I2C_FUNC_SMBUS_READ_I2C_BLOCK);184 int ret;185 186 regmap = devm_regmap_init_i2c(client, &bmc150_regmap_conf);187 if (IS_ERR(regmap)) {188 dev_err(&client->dev, "Failed to initialize i2c regmap\n");189 return PTR_ERR(regmap);190 }191 192 if (id) {193 name = id->name;194 type = id->driver_data;195 }196 197 ret = bmc150_accel_core_probe(&client->dev, regmap, client->irq,198 type, name, block_supported);199 if (ret)200 return ret;201 202 /*203 * The !id check avoids recursion when probe() gets called204 * for the second client.205 */206 if (!id && has_acpi_companion(&client->dev))207 bmc150_acpi_dual_accel_probe(client);208 209 return 0;210}211 212static void bmc150_accel_remove(struct i2c_client *client)213{214 bmc150_acpi_dual_accel_remove(client);215 216 bmc150_accel_core_remove(&client->dev);217}218 219static const struct acpi_device_id bmc150_accel_acpi_match[] = {220 {"BMA0255"},221 {"BMA0280"},222 {"BMA222"},223 {"BMA222E"},224 {"BMA250E"},225 {"BMC150A"},226 {"BMI055A"},227 /*228 * The "BOSC0200" identifier used here is not unique to devices using229 * bmc150. The same "BOSC0200" identifier is found in the ACPI tables230 * of the ASUS ROG ALLY and Ayaneo AIR Plus which both use a Bosch231 * BMI323 chip. This creates a conflict with duplicate ACPI identifiers232 * which multiple drivers want to use. Fortunately, when the bmc150233 * driver starts to load on the ASUS ROG ALLY, the chip ID check234 * portion fails (correctly) because the chip IDs received (via i2c)235 * are unique between bmc150 and bmi323 and a dmesg output similar to236 * this: "bmc150_accel_i2c i2c-BOSC0200:00: Invalid chip 0" can be237 * seen. This allows the bmi323 driver to take over for ASUS ROG ALLY,238 * and other devices using the bmi323 chip.239 */240 {"BOSC0200"},241 {"BSBA0150"},242 {"DUAL250E"},243 { },244};245MODULE_DEVICE_TABLE(acpi, bmc150_accel_acpi_match);246 247static const struct i2c_device_id bmc150_accel_id[] = {248 {"bma222"},249 {"bma222e"},250 {"bma250e"},251 {"bma253"},252 {"bma254"},253 {"bma255"},254 {"bma280"},255 {"bmc150_accel"},256 {"bmc156_accel", BOSCH_BMC156},257 {"bmi055_accel"},258 {}259};260 261MODULE_DEVICE_TABLE(i2c, bmc150_accel_id);262 263static const struct of_device_id bmc150_accel_of_match[] = {264 { .compatible = "bosch,bma222" },265 { .compatible = "bosch,bma222e" },266 { .compatible = "bosch,bma250e" },267 { .compatible = "bosch,bma253" },268 { .compatible = "bosch,bma254" },269 { .compatible = "bosch,bma255" },270 { .compatible = "bosch,bma280" },271 { .compatible = "bosch,bmc150_accel" },272 { .compatible = "bosch,bmc156_accel" },273 { .compatible = "bosch,bmi055_accel" },274 { },275};276MODULE_DEVICE_TABLE(of, bmc150_accel_of_match);277 278static struct i2c_driver bmc150_accel_driver = {279 .driver = {280 .name = "bmc150_accel_i2c",281 .of_match_table = bmc150_accel_of_match,282 .acpi_match_table = bmc150_accel_acpi_match,283 .pm = &bmc150_accel_pm_ops,284 },285 .probe = bmc150_accel_probe,286 .remove = bmc150_accel_remove,287 .id_table = bmc150_accel_id,288};289module_i2c_driver(bmc150_accel_driver);290 291MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>");292MODULE_LICENSE("GPL v2");293MODULE_DESCRIPTION("BMC150 I2C accelerometer driver");294MODULE_IMPORT_NS(IIO_BMC150);295