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
17static 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
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, hid2: "DUAL250E", NULL))
62 return false;
63
64 guid_parse(BMC150_DSM_GUID, u: &guid);
65
66 if (!acpi_check_dsm(handle: adev->handle, guid: &guid, rev: 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(handle: adev->handle, guid: &guid, rev: 0, DUAL250E_SET_ANGLE_FN_INDEX, argv4: &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 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, aux0: 0, ang0: 270))
98 return false;
99
100 /* The EC needs some time to notice the angle being changed */
101 msleep(msecs: 100);
102
103 return bmc150_acpi_set_angle_dsm(client, aux0: 0, ang0: 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(client: data->second_device);
112}
113
114static void bmc150_acpi_resume_handler(struct device *dev)
115{
116 struct bmc150_accel_data *data = iio_priv(indio_dev: 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(dwork: &data->resume_work, delay: msecs_to_jiffies(m: 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 */
130static void bmc150_acpi_dual_accel_probe(struct i2c_client *client)
131{
132 struct bmc150_accel_data *data = iio_priv(indio_dev: 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(device: adev, ids: 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(buf: dev_name, size: sizeof(dev_name), fmt: "%s:base", acpi_device_hid(device: adev));
149
150 board_info.irq = acpi_dev_gpio_irq_get(adev, index: 1);
151
152 data->second_device = i2c_acpi_new_device(dev: &client->dev, index: 1, info: &board_info);
153
154 if (!IS_ERR(ptr: data->second_device) && bmc150_acpi_enable_keyboard(client: 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(indio_dev: i2c_get_clientdata(client));
163
164 if (data->resume_callback)
165 cancel_delayed_work_sync(dwork: &data->resume_work);
166
167 i2c_unregister_device(client: data->second_device);
168}
169#else
170static void bmc150_acpi_dual_accel_probe(struct i2c_client *client) {}
171static void bmc150_acpi_dual_accel_remove(struct i2c_client *client) {}
172#endif
173
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(adap: client->adapter, I2C_FUNC_I2C) ||
182 i2c_check_functionality(adap: 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(ptr: regmap)) {
188 dev_err(&client->dev, "Failed to initialize i2c regmap\n");
189 return PTR_ERR(ptr: regmap);
190 }
191
192 if (id) {
193 name = id->name;
194 type = id->driver_data;
195 }
196
197 ret = bmc150_accel_core_probe(dev: &client->dev, regmap, irq: 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(dev: &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(dev: &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 {"BOSC0200"},
228 {"BSBA0150"},
229 {"DUAL250E"},
230 { },
231};
232MODULE_DEVICE_TABLE(acpi, bmc150_accel_acpi_match);
233
234static const struct i2c_device_id bmc150_accel_id[] = {
235 {"bma222"},
236 {"bma222e"},
237 {"bma250e"},
238 {"bma253"},
239 {"bma254"},
240 {"bma255"},
241 {"bma280"},
242 {"bmc150_accel"},
243 {"bmc156_accel", BOSCH_BMC156},
244 {"bmi055_accel"},
245 {}
246};
247
248MODULE_DEVICE_TABLE(i2c, bmc150_accel_id);
249
250static const struct of_device_id bmc150_accel_of_match[] = {
251 { .compatible = "bosch,bma222" },
252 { .compatible = "bosch,bma222e" },
253 { .compatible = "bosch,bma250e" },
254 { .compatible = "bosch,bma253" },
255 { .compatible = "bosch,bma254" },
256 { .compatible = "bosch,bma255" },
257 { .compatible = "bosch,bma280" },
258 { .compatible = "bosch,bmc150_accel" },
259 { .compatible = "bosch,bmc156_accel" },
260 { .compatible = "bosch,bmi055_accel" },
261 { },
262};
263MODULE_DEVICE_TABLE(of, bmc150_accel_of_match);
264
265static struct i2c_driver bmc150_accel_driver = {
266 .driver = {
267 .name = "bmc150_accel_i2c",
268 .of_match_table = bmc150_accel_of_match,
269 .acpi_match_table = ACPI_PTR(bmc150_accel_acpi_match),
270 .pm = &bmc150_accel_pm_ops,
271 },
272 .probe = bmc150_accel_probe,
273 .remove = bmc150_accel_remove,
274 .id_table = bmc150_accel_id,
275};
276module_i2c_driver(bmc150_accel_driver);
277
278MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>");
279MODULE_LICENSE("GPL v2");
280MODULE_DESCRIPTION("BMC150 I2C accelerometer driver");
281MODULE_IMPORT_NS(IIO_BMC150);
282

source code of linux/drivers/iio/accel/bmc150-accel-i2c.c