drivers/iio/accel/bmc150-accel-i2c.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * 3-axis accelerometer driver supporting many I2C Bosch-Sensortec chips
   4  * 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_ACPI
  17 static 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 accelerometer
  25  * in the display and 1 in the hinge has an ACPI-method (DSM) to tell the
  26  * ACPI code about the angle between the 2 halves. This will make the ACPI
  27  * code enable/disable the keyboard and touchpad. We need to call this to avoid
  28  * the keyboard being disabled when the 2-in-1 is turned-on or resumed while
  29  * 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 is
  31  * 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 presumably
  34  * define the angle between the gravity vector measured by the accelerometer in
  35  * 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 does
  37  * 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             3
  42
  43 struct dual250e_set_angle_args {
  44         u32 aux0;
  45         u32 ang0;
  46         u32 rawx;
  47         u32 rawy;
  48         u32 rawz;
  49 } __packed;
  50
  51 static 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
  90 static 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 first
  94          * set the angle to 270° (tent/stand mode) and then change it to
  95          * 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
 106 static 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
 114 static 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 system
 120          * 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 resource
 128  * with index 1.
 129  */
 130 static 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, as
 146          * 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
 160 static 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 #else
 170 static void bmc150_acpi_dual_accel_probe(struct i2c_client *client) {}
 171 static void bmc150_acpi_dual_accel_remove(struct i2c_client *client) {}
 172 #endif
 173
 174 static 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 called
 204          * 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
 212 static 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
 219 static 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 using
 229          * bmc150. The same "BOSC0200" identifier is found in the ACPI tables
 230          * of the ASUS ROG ALLY and Ayaneo AIR Plus which both use a Bosch
 231          * BMI323 chip. This creates a conflict with duplicate ACPI identifiers
 232          * which multiple drivers want to use. Fortunately, when the bmc150
 233          * driver starts to load on the ASUS ROG ALLY, the chip ID check
 234          * portion fails (correctly) because the chip IDs received (via i2c)
 235          * are unique between bmc150 and bmi323 and a dmesg output similar to
 236          * this: "bmc150_accel_i2c i2c-BOSC0200:00: Invalid chip 0" can be
 237          * 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 };
 245 MODULE_DEVICE_TABLE(acpi, bmc150_accel_acpi_match);
 246
 247 static 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
 261 MODULE_DEVICE_TABLE(i2c, bmc150_accel_id);
 262
 263 static 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 };
 276 MODULE_DEVICE_TABLE(of, bmc150_accel_of_match);
 277
 278 static 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 };
 289 module_i2c_driver(bmc150_accel_driver);
 290
 291 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>");
 292 MODULE_LICENSE("GPL v2");
 293 MODULE_DESCRIPTION("BMC150 I2C accelerometer driver");
 294 MODULE_IMPORT_NS("IIO_BMC150");