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, "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
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, 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
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(data->second_device);
112}
113
114static 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 */
130static 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
160static 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
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(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
212static 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
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