int3403_thermal.c

  1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * ACPI INT3403 thermal driver
  4 * Copyright (c) 2013, Intel Corporation.
  5 */
  6
  7#include <linux/kernel.h>
  8#include <linux/module.h>
  9#include <linux/init.h>
 10#include <linux/types.h>
 11#include <linux/acpi.h>
 12#include <linux/thermal.h>
 13#include <linux/platform_device.h>
 14#include "int340x_thermal_zone.h"
 15
 16#define INT3403_TYPE_SENSOR		0x03
 17#define INT3403_TYPE_CHARGER		0x0B
 18#define INT3403_TYPE_BATTERY		0x0C
 19#define INT3403_PERF_CHANGED_EVENT	0x80
 20#define INT3403_PERF_TRIP_POINT_CHANGED	0x81
 21#define INT3403_THERMAL_EVENT		0x90
 22
 23/* Preserved structure for future expandbility */
 24struct int3403_sensor {
 25	struct int34x_thermal_zone *int340x_zone;
 26};
 27
 28struct int3403_cdev {
 29	struct thermal_cooling_device *cdev;
 30	unsigned long max_state;
 31};
 32
 33struct int3403_priv {
 34	struct platform_device *pdev;
 35	struct acpi_device *adev;
 36	unsigned long long type;
 37	void *priv;
 38};
 39
 40static void int3403_notify(acpi_handle handle,
 41		u32 event, void *data)
 42{
 43	struct int3403_priv *priv = data;
 44	struct int3403_sensor *obj;
 45
 46	if (!priv)
 47		return;
 48
 49	obj = priv->priv;
 50	if (priv->type != INT3403_TYPE_SENSOR || !obj)
 51		return;
 52
 53	switch (event) {
 54	case INT3403_PERF_CHANGED_EVENT:
 55		break;
 56	case INT3403_THERMAL_EVENT:
 57		int340x_thermal_zone_device_update(obj->int340x_zone,
 58						   THERMAL_TRIP_VIOLATED);
 59		break;
 60	case INT3403_PERF_TRIP_POINT_CHANGED:
 61		int340x_thermal_update_trips(obj->int340x_zone);
 62		int340x_thermal_zone_device_update(obj->int340x_zone,
 63						   THERMAL_TRIP_CHANGED);
 64		break;
 65	default:
 66		dev_dbg(&priv->pdev->dev, "Unsupported event [0x%x]\n", event);
 67		break;
 68	}
 69}
 70
 71static int int3403_sensor_add(struct int3403_priv *priv)
 72{
 73	int result = 0;
 74	struct int3403_sensor *obj;
 75
 76	obj = devm_kzalloc(&priv->pdev->dev, sizeof(*obj), GFP_KERNEL);
 77	if (!obj)
 78		return -ENOMEM;
 79
 80	priv->priv = obj;
 81
 82	obj->int340x_zone = int340x_thermal_zone_add(priv->adev, NULL);
 83	if (IS_ERR(obj->int340x_zone))
 84		return PTR_ERR(obj->int340x_zone);
 85
 86	result = acpi_install_notify_handler(priv->adev->handle,
 87			ACPI_DEVICE_NOTIFY, int3403_notify,
 88			(void *)priv);
 89	if (result)
 90		goto err_free_obj;
 91
 92	return 0;
 93
 94 err_free_obj:
 95	int340x_thermal_zone_remove(obj->int340x_zone);
 96	return result;
 97}
 98
 99static int int3403_sensor_remove(struct int3403_priv *priv)
100{
101	struct int3403_sensor *obj = priv->priv;
102
103	acpi_remove_notify_handler(priv->adev->handle,
104				   ACPI_DEVICE_NOTIFY, int3403_notify);
105	int340x_thermal_zone_remove(obj->int340x_zone);
106
107	return 0;
108}
109
110/* INT3403 Cooling devices */
111static int int3403_get_max_state(struct thermal_cooling_device *cdev,
112				 unsigned long *state)
113{
114	struct int3403_priv *priv = cdev->devdata;
115	struct int3403_cdev *obj = priv->priv;
116
117	*state = obj->max_state;
118	return 0;
119}
120
121static int int3403_get_cur_state(struct thermal_cooling_device *cdev,
122				 unsigned long *state)
123{
124	struct int3403_priv *priv = cdev->devdata;
125	unsigned long long level;
126	acpi_status status;
127
128	status = acpi_evaluate_integer(priv->adev->handle, "PPPC", NULL, &level);
129	if (ACPI_SUCCESS(status)) {
130		*state = level;
131		return 0;
132	} else
133		return -EINVAL;
134}
135
136static int
137int3403_set_cur_state(struct thermal_cooling_device *cdev, unsigned long state)
138{
139	struct int3403_priv *priv = cdev->devdata;
140	acpi_status status;
141
142	status = acpi_execute_simple_method(priv->adev->handle, "SPPC", state);
143	if (ACPI_SUCCESS(status))
144		return 0;
145	else
146		return -EINVAL;
147}
148
149static const struct thermal_cooling_device_ops int3403_cooling_ops = {
150	.get_max_state = int3403_get_max_state,
151	.get_cur_state = int3403_get_cur_state,
152	.set_cur_state = int3403_set_cur_state,
153};
154
155static int int3403_cdev_add(struct int3403_priv *priv)
156{
157	int result = 0;
158	acpi_status status;
159	struct int3403_cdev *obj;
160	struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER, NULL };
161	union acpi_object *p;
162
163	obj = devm_kzalloc(&priv->pdev->dev, sizeof(*obj), GFP_KERNEL);
164	if (!obj)
165		return -ENOMEM;
166
167	status = acpi_evaluate_object(priv->adev->handle, "PPSS", NULL, &buf);
168	if (ACPI_FAILURE(status))
169		return -ENODEV;
170
171	p = buf.pointer;
172	if (!p || (p->type != ACPI_TYPE_PACKAGE)) {
173		pr_warn("Invalid PPSS data\n");
174		kfree(buf.pointer);
175		return -EFAULT;
176	}
177
178	priv->priv = obj;
179	obj->max_state = p->package.count - 1;
180	obj->cdev =
181		thermal_cooling_device_register(acpi_device_bid(priv->adev),
182				priv, &int3403_cooling_ops);
183	if (IS_ERR(obj->cdev))
184		result = PTR_ERR(obj->cdev);
185
186	kfree(buf.pointer);
187	/* TODO: add ACPI notification support */
188
189	return result;
190}
191
192static int int3403_cdev_remove(struct int3403_priv *priv)
193{
194	struct int3403_cdev *obj = priv->priv;
195
196	thermal_cooling_device_unregister(obj->cdev);
197	return 0;
198}
199
200static int int3403_add(struct platform_device *pdev)
201{
202	struct int3403_priv *priv;
203	int result = 0;
204	unsigned long long tmp;
205	acpi_status status;
206
207	priv = devm_kzalloc(&pdev->dev, sizeof(struct int3403_priv),
208			    GFP_KERNEL);
209	if (!priv)
210		return -ENOMEM;
211
212	priv->pdev = pdev;
213	priv->adev = ACPI_COMPANION(&(pdev->dev));
214	if (!priv->adev) {
215		result = -EINVAL;
216		goto err;
217	}
218
219
220	status = acpi_evaluate_integer(priv->adev->handle, "_TMP",
221				       NULL, &tmp);
222	if (ACPI_FAILURE(status)) {
223		status = acpi_evaluate_integer(priv->adev->handle, "PTYP",
224				       NULL, &priv->type);
225		if (ACPI_FAILURE(status)) {
226			result = -EINVAL;
227			goto err;
228		}
229	} else {
230		priv->type = INT3403_TYPE_SENSOR;
231	}
232
233	platform_set_drvdata(pdev, priv);
234	switch (priv->type) {
235	case INT3403_TYPE_SENSOR:
236		result = int3403_sensor_add(priv);
237		break;
238	case INT3403_TYPE_CHARGER:
239	case INT3403_TYPE_BATTERY:
240		result = int3403_cdev_add(priv);
241		break;
242	default:
243		result = -EINVAL;
244	}
245
246	if (result)
247		goto err;
248	return result;
249
250err:
251	return result;
252}
253
254static void int3403_remove(struct platform_device *pdev)
255{
256	struct int3403_priv *priv = platform_get_drvdata(pdev);
257
258	switch (priv->type) {
259	case INT3403_TYPE_SENSOR:
260		int3403_sensor_remove(priv);
261		break;
262	case INT3403_TYPE_CHARGER:
263	case INT3403_TYPE_BATTERY:
264		int3403_cdev_remove(priv);
265		break;
266	default:
267		break;
268	}
269}
270
271static const struct acpi_device_id int3403_device_ids[] = {
272	{"INT3403", 0},
273	{"INTC1043", 0},
274	{"INTC1046", 0},
275	{"INTC1062", 0},
276	{"INTC1069", 0},
277	{"INTC10A1", 0},
278	{"INTC10D5", 0},
279	{"INTC10FD", 0},
280	{"INTC10F4", 0},
281	{"", 0},
282};
283MODULE_DEVICE_TABLE(acpi, int3403_device_ids);
284
285static struct platform_driver int3403_driver = {
286	.probe = int3403_add,
287	.remove = int3403_remove,
288	.driver = {
289		.name = "int3403 thermal",
290		.acpi_match_table = int3403_device_ids,
291	},
292};
293
294module_platform_driver(int3403_driver);
295
296MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>");
297MODULE_LICENSE("GPL v2");
298MODULE_DESCRIPTION("ACPI INT3403 thermal driver");