Merge tag 'x86-urgent-2024-03-24' of git://git.kernel.org/pub/scm/linux/kernel/git...
[sfrench/cifs-2.6.git] / 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);