122 lines
2.9 KiB
C
122 lines
2.9 KiB
C
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#include <linux/device.h>
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#include <linux/module.h>
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#include <linux/notifier.h>
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#include <linux/sec_class.h>
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#include <linux/vbus_notifier.h>
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#define SET_VBUS_NOTIFIER_BLOCK(nb, fn, dev) do { \
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(nb)->notifier_call = (fn); \
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(nb)->priority = (dev); \
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} while (0)
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#define DESTROY_VBUS_NOTIFIER_BLOCK(nb) \
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SET_VBUS_NOTIFIER_BLOCK(nb, NULL, -1)
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static struct vbus_notifier_struct vbus_notifier;
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struct blocking_notifier_head vbus_notifier_head =
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BLOCKING_NOTIFIER_INIT(vbus_notifier_head);
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static DEFINE_MUTEX(vbus_mutex);
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int vbus_notifier_register(struct notifier_block *nb, notifier_fn_t notifier,
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vbus_notifier_device_t listener)
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{
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int ret = 0;
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pr_info("%s: listener=%d register\n", __func__, listener);
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SET_VBUS_NOTIFIER_BLOCK(nb, notifier, listener);
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ret = blocking_notifier_chain_register(&vbus_notifier_head, nb);
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if (ret < 0)
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pr_err("%s: blocking_notifier_chain_register error(%d)\n",
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__func__, ret);
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mutex_lock(&vbus_mutex);
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if (vbus_notifier.vbus_type != STATUS_VBUS_UNKNOWN)
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nb->notifier_call(nb, vbus_notifier.cmd, &(vbus_notifier.vbus_type));
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mutex_unlock(&vbus_mutex);
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return ret;
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}
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EXPORT_SYMBOL(vbus_notifier_register);
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int vbus_notifier_unregister(struct notifier_block *nb)
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{
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int ret = 0;
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pr_info("%s: listener=%d unregister\n", __func__, nb->priority);
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ret = blocking_notifier_chain_unregister(&vbus_notifier_head, nb);
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if (ret < 0)
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pr_err("%s: blocking_notifier_chain_unregister error(%d)\n",
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__func__, ret);
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DESTROY_VBUS_NOTIFIER_BLOCK(nb);
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return ret;
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}
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EXPORT_SYMBOL(vbus_notifier_unregister);
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static int vbus_notifier_notify(void)
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{
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int ret = 0;
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pr_info("%s: CMD=%d, DATA=%d\n", __func__, vbus_notifier.cmd,
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vbus_notifier.vbus_type);
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ret = blocking_notifier_call_chain(&vbus_notifier_head,
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vbus_notifier.cmd, &(vbus_notifier.vbus_type));
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switch (ret) {
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case NOTIFY_STOP_MASK:
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case NOTIFY_BAD:
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pr_err("%s: notify error occur(0x%x)\n", __func__, ret);
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break;
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case NOTIFY_DONE:
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case NOTIFY_OK:
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pr_info("%s: notify done(0x%x)\n", __func__, ret);
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break;
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default:
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pr_info("%s: notify status unknown(0x%x)\n", __func__, ret);
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break;
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}
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return ret;
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}
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void vbus_notifier_handle(vbus_status_t new_dev)
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{
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pr_info("%s: (%d)->(%d)\n", __func__, vbus_notifier.vbus_type, new_dev);
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if (vbus_notifier.vbus_type == new_dev)
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return;
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mutex_lock(&vbus_mutex);
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if (new_dev == STATUS_VBUS_HIGH)
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vbus_notifier.cmd = VBUS_NOTIFY_CMD_RISING;
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else if (new_dev == STATUS_VBUS_LOW)
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vbus_notifier.cmd = VBUS_NOTIFY_CMD_FALLING;
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vbus_notifier.vbus_type = new_dev;
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mutex_unlock(&vbus_mutex);
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/* vbus attach broadcast */
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vbus_notifier_notify();
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}
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EXPORT_SYMBOL(vbus_notifier_handle);
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static int __init vbus_notifier_init(void)
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{
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return 0;
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}
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static void __exit vbus_notifier_exit(void)
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{
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}
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module_init(vbus_notifier_init);
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module_exit(vbus_notifier_exit);
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MODULE_AUTHOR("Samsung USB Team");
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MODULE_DESCRIPTION("Vbus Notifier");
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MODULE_LICENSE("GPL");
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