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, 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 | |
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, 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 | |
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(client: data->second_device); |
112 | } |
113 | |
114 | static 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 | */ |
130 | static 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 | |
160 | static 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 |
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(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 | |
212 | static 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 | |
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 | {"BOSC0200" }, |
228 | {"BSBA0150" }, |
229 | {"DUAL250E" }, |
230 | { }, |
231 | }; |
232 | MODULE_DEVICE_TABLE(acpi, bmc150_accel_acpi_match); |
233 | |
234 | static 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 | |
248 | MODULE_DEVICE_TABLE(i2c, bmc150_accel_id); |
249 | |
250 | static 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 | }; |
263 | MODULE_DEVICE_TABLE(of, bmc150_accel_of_match); |
264 | |
265 | static 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 | }; |
276 | module_i2c_driver(bmc150_accel_driver); |
277 | |
278 | MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>" ); |
279 | MODULE_LICENSE("GPL v2" ); |
280 | MODULE_DESCRIPTION("BMC150 I2C accelerometer driver" ); |
281 | MODULE_IMPORT_NS(IIO_BMC150); |
282 | |