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 			      const struct i2c_device_id *id)
176 {
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 int 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 	return 0;
219 }
220 
221 static const struct acpi_device_id bmc150_accel_acpi_match[] = {
222 	{"BMA0255"},
223 	{"BMA0280"},
224 	{"BMA222"},
225 	{"BMA222E"},
226 	{"BMA250E"},
227 	{"BMC150A"},
228 	{"BMI055A"},
229 	{"BOSC0200"},
230 	{"BSBA0150"},
231 	{"DUAL250E"},
232 	{ },
233 };
234 MODULE_DEVICE_TABLE(acpi, bmc150_accel_acpi_match);
235 
236 static const struct i2c_device_id bmc150_accel_id[] = {
237 	{"bma222"},
238 	{"bma222e"},
239 	{"bma250e"},
240 	{"bma253"},
241 	{"bma254"},
242 	{"bma255"},
243 	{"bma280"},
244 	{"bmc150_accel"},
245 	{"bmc156_accel", BOSCH_BMC156},
246 	{"bmi055_accel"},
247 	{}
248 };
249 
250 MODULE_DEVICE_TABLE(i2c, bmc150_accel_id);
251 
252 static const struct of_device_id bmc150_accel_of_match[] = {
253 	{ .compatible = "bosch,bma222" },
254 	{ .compatible = "bosch,bma222e" },
255 	{ .compatible = "bosch,bma250e" },
256 	{ .compatible = "bosch,bma253" },
257 	{ .compatible = "bosch,bma254" },
258 	{ .compatible = "bosch,bma255" },
259 	{ .compatible = "bosch,bma280" },
260 	{ .compatible = "bosch,bmc150_accel" },
261 	{ .compatible = "bosch,bmc156_accel" },
262 	{ .compatible = "bosch,bmi055_accel" },
263 	{ },
264 };
265 MODULE_DEVICE_TABLE(of, bmc150_accel_of_match);
266 
267 static struct i2c_driver bmc150_accel_driver = {
268 	.driver = {
269 		.name	= "bmc150_accel_i2c",
270 		.of_match_table = bmc150_accel_of_match,
271 		.acpi_match_table = ACPI_PTR(bmc150_accel_acpi_match),
272 		.pm	= &bmc150_accel_pm_ops,
273 	},
274 	.probe		= bmc150_accel_probe,
275 	.remove		= bmc150_accel_remove,
276 	.id_table	= bmc150_accel_id,
277 };
278 module_i2c_driver(bmc150_accel_driver);
279 
280 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>");
281 MODULE_LICENSE("GPL v2");
282 MODULE_DESCRIPTION("BMC150 I2C accelerometer driver");
283 MODULE_IMPORT_NS(IIO_BMC150);
284