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); 295