1 // SPDX-License-Identifier: GPL-2.0
3 * Greybus Vibrator protocol driver.
5 * Copyright 2014 Google Inc.
6 * Copyright 2014 Linaro Ltd.
9 #include <linux/kernel.h>
10 #include <linux/module.h>
11 #include <linux/slab.h>
12 #include <linux/device.h>
13 #include <linux/kdev_t.h>
14 #include <linux/idr.h>
15 #include <linux/pm_runtime.h>
16 #include <linux/greybus.h>
18 struct gb_vibrator_device {
19 struct gb_connection *connection;
21 int minor; /* vibrator minor number */
22 struct delayed_work delayed_work;
25 /* Greybus Vibrator operation types */
26 #define GB_VIBRATOR_TYPE_ON 0x02
27 #define GB_VIBRATOR_TYPE_OFF 0x03
29 static int turn_off(struct gb_vibrator_device *vib)
31 struct gb_bundle *bundle = vib->connection->bundle;
34 ret = gb_operation_sync(vib->connection, GB_VIBRATOR_TYPE_OFF,
37 gb_pm_runtime_put_autosuspend(bundle);
42 static int turn_on(struct gb_vibrator_device *vib, u16 timeout_ms)
44 struct gb_bundle *bundle = vib->connection->bundle;
47 ret = gb_pm_runtime_get_sync(bundle);
51 /* Vibrator was switched ON earlier */
52 if (cancel_delayed_work_sync(&vib->delayed_work))
55 ret = gb_operation_sync(vib->connection, GB_VIBRATOR_TYPE_ON,
58 gb_pm_runtime_put_autosuspend(bundle);
62 schedule_delayed_work(&vib->delayed_work, msecs_to_jiffies(timeout_ms));
67 static void gb_vibrator_worker(struct work_struct *work)
69 struct delayed_work *delayed_work = to_delayed_work(work);
70 struct gb_vibrator_device *vib =
71 container_of(delayed_work,
72 struct gb_vibrator_device,
78 static ssize_t timeout_store(struct device *dev, struct device_attribute *attr,
79 const char *buf, size_t count)
81 struct gb_vibrator_device *vib = dev_get_drvdata(dev);
85 retval = kstrtoul(buf, 10, &val);
87 dev_err(dev, "could not parse timeout value %d\n", retval);
92 retval = turn_on(vib, (u16)val);
94 retval = turn_off(vib);
100 static DEVICE_ATTR_WO(timeout);
102 static struct attribute *vibrator_attrs[] = {
103 &dev_attr_timeout.attr,
106 ATTRIBUTE_GROUPS(vibrator);
108 static struct class vibrator_class = {
110 .owner = THIS_MODULE,
111 .dev_groups = vibrator_groups,
114 static DEFINE_IDA(minors);
116 static int gb_vibrator_probe(struct gb_bundle *bundle,
117 const struct greybus_bundle_id *id)
119 struct greybus_descriptor_cport *cport_desc;
120 struct gb_connection *connection;
121 struct gb_vibrator_device *vib;
125 if (bundle->num_cports != 1)
128 cport_desc = &bundle->cport_desc[0];
129 if (cport_desc->protocol_id != GREYBUS_PROTOCOL_VIBRATOR)
132 vib = kzalloc(sizeof(*vib), GFP_KERNEL);
136 connection = gb_connection_create(bundle, le16_to_cpu(cport_desc->id),
138 if (IS_ERR(connection)) {
139 retval = PTR_ERR(connection);
142 gb_connection_set_data(connection, vib);
144 vib->connection = connection;
146 greybus_set_drvdata(bundle, vib);
148 retval = gb_connection_enable(connection);
150 goto err_connection_destroy;
153 * For now we create a device in sysfs for the vibrator, but odds are
154 * there is a "real" device somewhere in the kernel for this, but I
155 * can't find it at the moment...
157 vib->minor = ida_simple_get(&minors, 0, 0, GFP_KERNEL);
158 if (vib->minor < 0) {
160 goto err_connection_disable;
162 dev = device_create(&vibrator_class, &bundle->dev,
163 MKDEV(0, 0), vib, "vibrator%d", vib->minor);
170 INIT_DELAYED_WORK(&vib->delayed_work, gb_vibrator_worker);
172 gb_pm_runtime_put_autosuspend(bundle);
177 ida_simple_remove(&minors, vib->minor);
178 err_connection_disable:
179 gb_connection_disable(connection);
180 err_connection_destroy:
181 gb_connection_destroy(connection);
188 static void gb_vibrator_disconnect(struct gb_bundle *bundle)
190 struct gb_vibrator_device *vib = greybus_get_drvdata(bundle);
193 ret = gb_pm_runtime_get_sync(bundle);
195 gb_pm_runtime_get_noresume(bundle);
197 if (cancel_delayed_work_sync(&vib->delayed_work))
200 device_unregister(vib->dev);
201 ida_simple_remove(&minors, vib->minor);
202 gb_connection_disable(vib->connection);
203 gb_connection_destroy(vib->connection);
207 static const struct greybus_bundle_id gb_vibrator_id_table[] = {
208 { GREYBUS_DEVICE_CLASS(GREYBUS_CLASS_VIBRATOR) },
211 MODULE_DEVICE_TABLE(greybus, gb_vibrator_id_table);
213 static struct greybus_driver gb_vibrator_driver = {
215 .probe = gb_vibrator_probe,
216 .disconnect = gb_vibrator_disconnect,
217 .id_table = gb_vibrator_id_table,
220 static __init int gb_vibrator_init(void)
224 retval = class_register(&vibrator_class);
228 retval = greybus_register(&gb_vibrator_driver);
230 goto err_class_unregister;
234 err_class_unregister:
235 class_unregister(&vibrator_class);
239 module_init(gb_vibrator_init);
241 static __exit void gb_vibrator_exit(void)
243 greybus_deregister(&gb_vibrator_driver);
244 class_unregister(&vibrator_class);
245 ida_destroy(&minors);
247 module_exit(gb_vibrator_exit);
249 MODULE_LICENSE("GPL v2");