iio/accel/bmc150-accel-i2c.c

0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  * 3-axis accelerometer driver supporting many I2C Bosch-Sensortec chips
0004  * Copyright (c) 2014, Intel Corporation.
0005  */
0006
0007 #include <linux/device.h>
0008 #include <linux/mod_devicetable.h>
0009 #include <linux/i2c.h>
0010 #include <linux/module.h>
0011 #include <linux/acpi.h>
0012 #include <linux/regmap.h>
0013
0014 #include "bmc150-accel.h"
0015
0016 #ifdef CONFIG_ACPI
0017 static const struct acpi_device_id bmc150_acpi_dual_accel_ids[] = {
0018     {"BOSC0200"},
0019     {"DUAL250E"},
0020     { }
0021 };
0022
0023 /*
0024  * The DUAL250E ACPI device for 360° hinges type 2-in-1s with 1 accelerometer
0025  * in the display and 1 in the hinge has an ACPI-method (DSM) to tell the
0026  * ACPI code about the angle between the 2 halves. This will make the ACPI
0027  * code enable/disable the keyboard and touchpad. We need to call this to avoid
0028  * the keyboard being disabled when the 2-in-1 is turned-on or resumed while
0029  * fully folded into tablet mode (which gets detected with a HALL-sensor).
0030  * If we don't call this then the keyboard won't work even when the 2-in-1 is
0031  * changed to be used in laptop mode after the power-on / resume.
0032  *
0033  * This DSM takes 2 angles, selected by setting aux0 to 0 or 1, these presumably
0034  * define the angle between the gravity vector measured by the accelerometer in
0035  * the display (aux0=0) resp. the base (aux0=1) and some reference vector.
0036  * The 2 angles get subtracted from each other so the reference vector does
0037  * not matter and we can simply leave the second angle at 0.
0038  */
0039
0040 #define BMC150_DSM_GUID             "7681541e-8827-4239-8d9d-36be7fe12542"
0041 #define DUAL250E_SET_ANGLE_FN_INDEX     3
0042
0043 struct dual250e_set_angle_args {
0044     u32 aux0;
0045     u32 ang0;
0046     u32 rawx;
0047     u32 rawy;
0048     u32 rawz;
0049 } __packed;
0050
0051 static bool bmc150_acpi_set_angle_dsm(struct i2c_client *client, u32 aux0, u32 ang0)
0052 {
0053     struct acpi_device *adev = ACPI_COMPANION(&client->dev);
0054     struct dual250e_set_angle_args args = {
0055         .aux0 = aux0,
0056         .ang0 = ang0,
0057     };
0058     union acpi_object args_obj, *obj;
0059     guid_t guid;
0060
0061     if (!acpi_dev_hid_uid_match(adev, "DUAL250E", NULL))
0062         return false;
0063
0064     guid_parse(BMC150_DSM_GUID, &guid);
0065
0066     if (!acpi_check_dsm(adev->handle, &guid, 0, BIT(DUAL250E_SET_ANGLE_FN_INDEX)))
0067         return false;
0068
0069     /*
0070      * Note this triggers the following warning:
0071      * "ACPI Warning: \_SB.PCI0.I2C2.ACC1._DSM: Argument #4 type mismatch -
0072      *                Found [Buffer], ACPI requires [Package]"
0073      * This is unavoidable since the _DSM implementation expects a "naked"
0074      * buffer, so wrapping it in a package will _not_ work.
0075      */
0076     args_obj.type = ACPI_TYPE_BUFFER;
0077     args_obj.buffer.length = sizeof(args);
0078     args_obj.buffer.pointer = (u8 *)&args;
0079
0080     obj = acpi_evaluate_dsm(adev->handle, &guid, 0, DUAL250E_SET_ANGLE_FN_INDEX, &args_obj);
0081     if (!obj) {
0082         dev_err(&client->dev, "Failed to call DSM to enable keyboard and touchpad\n");
0083         return false;
0084     }
0085
0086     ACPI_FREE(obj);
0087     return true;
0088 }
0089
0090 static bool bmc150_acpi_enable_keyboard(struct i2c_client *client)
0091 {
0092     /*
0093      * The EC must see a change for it to re-enable the kbd, so first
0094      * set the angle to 270° (tent/stand mode) and then change it to
0095      * 90° (laptop mode).
0096      */
0097     if (!bmc150_acpi_set_angle_dsm(client, 0, 270))
0098         return false;
0099
0100     /* The EC needs some time to notice the angle being changed */
0101     msleep(100);
0102
0103     return bmc150_acpi_set_angle_dsm(client, 0, 90);
0104 }
0105
0106 static void bmc150_acpi_resume_work(struct work_struct *work)
0107 {
0108     struct bmc150_accel_data *data =
0109         container_of(work, struct bmc150_accel_data, resume_work.work);
0110
0111     bmc150_acpi_enable_keyboard(data->second_device);
0112 }
0113
0114 static void bmc150_acpi_resume_handler(struct device *dev)
0115 {
0116     struct bmc150_accel_data *data = iio_priv(dev_get_drvdata(dev));
0117
0118     /*
0119      * Delay the bmc150_acpi_enable_keyboard() call till after the system
0120      * resume has completed, otherwise it will not work.
0121      */
0122     schedule_delayed_work(&data->resume_work, msecs_to_jiffies(1000));
0123 }
0124
0125 /*
0126  * Some acpi_devices describe 2 accelerometers in a single ACPI device,
0127  * try instantiating a second i2c_client for an I2cSerialBusV2 ACPI resource
0128  * with index 1.
0129  */
0130 static void bmc150_acpi_dual_accel_probe(struct i2c_client *client)
0131 {
0132     struct bmc150_accel_data *data = iio_priv(i2c_get_clientdata(client));
0133     struct acpi_device *adev = ACPI_COMPANION(&client->dev);
0134     char dev_name[16];
0135     struct i2c_board_info board_info = {
0136         .type = "bmc150_accel",
0137         .dev_name = dev_name,
0138         .fwnode = client->dev.fwnode,
0139     };
0140
0141     if (acpi_match_device_ids(adev, bmc150_acpi_dual_accel_ids))
0142         return;
0143
0144     /*
0145      * The 2nd accel sits in the base of 2-in-1s. The suffix is static, as
0146      * there should never be more then 1 ACPI node with 2 accelerometers.
0147      */
0148     snprintf(dev_name, sizeof(dev_name), "%s:base", acpi_device_hid(adev));
0149
0150     board_info.irq = acpi_dev_gpio_irq_get(adev, 1);
0151
0152     data->second_device = i2c_acpi_new_device(&client->dev, 1, &board_info);
0153
0154     if (!IS_ERR(data->second_device) && bmc150_acpi_enable_keyboard(data->second_device)) {
0155         INIT_DELAYED_WORK(&data->resume_work, bmc150_acpi_resume_work);
0156         data->resume_callback = bmc150_acpi_resume_handler;
0157     }
0158 }
0159
0160 static void bmc150_acpi_dual_accel_remove(struct i2c_client *client)
0161 {
0162     struct bmc150_accel_data *data = iio_priv(i2c_get_clientdata(client));
0163
0164     if (data->resume_callback)
0165         cancel_delayed_work_sync(&data->resume_work);
0166
0167     i2c_unregister_device(data->second_device);
0168 }
0169 #else
0170 static void bmc150_acpi_dual_accel_probe(struct i2c_client *client) {}
0171 static void bmc150_acpi_dual_accel_remove(struct i2c_client *client) {}
0172 #endif
0173
0174 static int bmc150_accel_probe(struct i2c_client *client,
0175                   const struct i2c_device_id *id)
0176 {
0177     struct regmap *regmap;
0178     const char *name = NULL;
0179     enum bmc150_type type = BOSCH_UNKNOWN;
0180     bool block_supported =
0181         i2c_check_functionality(client->adapter, I2C_FUNC_I2C) ||
0182         i2c_check_functionality(client->adapter,
0183                     I2C_FUNC_SMBUS_READ_I2C_BLOCK);
0184     int ret;
0185
0186     regmap = devm_regmap_init_i2c(client, &bmc150_regmap_conf);
0187     if (IS_ERR(regmap)) {
0188         dev_err(&client->dev, "Failed to initialize i2c regmap\n");
0189         return PTR_ERR(regmap);
0190     }
0191
0192     if (id) {
0193         name = id->name;
0194         type = id->driver_data;
0195     }
0196
0197     ret = bmc150_accel_core_probe(&client->dev, regmap, client->irq,
0198                       type, name, block_supported);
0199     if (ret)
0200         return ret;
0201
0202     /*
0203      * The !id check avoids recursion when probe() gets called
0204      * for the second client.
0205      */
0206     if (!id && has_acpi_companion(&client->dev))
0207         bmc150_acpi_dual_accel_probe(client);
0208
0209     return 0;
0210 }
0211
0212 static int bmc150_accel_remove(struct i2c_client *client)
0213 {
0214     bmc150_acpi_dual_accel_remove(client);
0215
0216     bmc150_accel_core_remove(&client->dev);
0217
0218     return 0;
0219 }
0220
0221 static const struct acpi_device_id bmc150_accel_acpi_match[] = {
0222     {"BMA0255"},
0223     {"BMA0280"},
0224     {"BMA222"},
0225     {"BMA222E"},
0226     {"BMA250E"},
0227     {"BMC150A"},
0228     {"BMI055A"},
0229     {"BOSC0200"},
0230     {"BSBA0150"},
0231     {"DUAL250E"},
0232     { },
0233 };
0234 MODULE_DEVICE_TABLE(acpi, bmc150_accel_acpi_match);
0235
0236 static const struct i2c_device_id bmc150_accel_id[] = {
0237     {"bma222"},
0238     {"bma222e"},
0239     {"bma250e"},
0240     {"bma253"},
0241     {"bma254"},
0242     {"bma255"},
0243     {"bma280"},
0244     {"bmc150_accel"},
0245     {"bmc156_accel", BOSCH_BMC156},
0246     {"bmi055_accel"},
0247     {}
0248 };
0249
0250 MODULE_DEVICE_TABLE(i2c, bmc150_accel_id);
0251
0252 static const struct of_device_id bmc150_accel_of_match[] = {
0253     { .compatible = "bosch,bma222" },
0254     { .compatible = "bosch,bma222e" },
0255     { .compatible = "bosch,bma250e" },
0256     { .compatible = "bosch,bma253" },
0257     { .compatible = "bosch,bma254" },
0258     { .compatible = "bosch,bma255" },
0259     { .compatible = "bosch,bma280" },
0260     { .compatible = "bosch,bmc150_accel" },
0261     { .compatible = "bosch,bmc156_accel" },
0262     { .compatible = "bosch,bmi055_accel" },
0263     { },
0264 };
0265 MODULE_DEVICE_TABLE(of, bmc150_accel_of_match);
0266
0267 static struct i2c_driver bmc150_accel_driver = {
0268     .driver = {
0269         .name   = "bmc150_accel_i2c",
0270         .of_match_table = bmc150_accel_of_match,
0271         .acpi_match_table = ACPI_PTR(bmc150_accel_acpi_match),
0272         .pm = &bmc150_accel_pm_ops,
0273     },
0274     .probe      = bmc150_accel_probe,
0275     .remove     = bmc150_accel_remove,
0276     .id_table   = bmc150_accel_id,
0277 };
0278 module_i2c_driver(bmc150_accel_driver);
0279
0280 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>");
0281 MODULE_LICENSE("GPL v2");
0282 MODULE_DESCRIPTION("BMC150 I2C accelerometer driver");
0283 MODULE_IMPORT_NS(IIO_BMC150);