154 lines
4.0 KiB
C
154 lines
4.0 KiB
C
#include <linux/device.h>
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#include <linux/notifier.h>
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#include <linux/muic/muic.h>
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#include <linux/muic/muic_notifier.h>
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#include <linux/sec_class.h>
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#define SET_MUIC_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_MUIC_NOTIFIER_BLOCK(nb) \
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SET_MUIC_NOTIFIER_BLOCK(nb, NULL, -1)
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static struct muic_notifier_struct muic_notifier;
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struct device *switch_device;
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int muic_notifier_register(struct notifier_block *nb, notifier_fn_t notifier,
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muic_notifier_device_t listener)
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{
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int ret = 0;
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printk(KERN_DEBUG "[muic] %s: listener=%d\n", __func__, listener);
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SET_MUIC_NOTIFIER_BLOCK(nb, notifier, listener);
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ret = blocking_notifier_chain_register(&(muic_notifier.notifier_call_chain), nb);
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if (ret < 0)
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printk(KERN_ERR "[muic] notifier_chain_register error(%d)\n", ret);
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/* current muic's attached_device status notify */
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nb->notifier_call(nb, muic_notifier.cmd,
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&(muic_notifier.attached_dev));
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return ret;
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}
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int muic_notifier_unregister(struct notifier_block *nb)
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{
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int ret = 0;
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printk(KERN_DEBUG "[muic] %s: listener=%d unregister\n", __func__, nb->priority);
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ret = blocking_notifier_chain_unregister(&(muic_notifier.notifier_call_chain), nb);
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if (ret < 0)
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printk(KERN_ERR "[muic] notifier_chain_unregister error(%d)\n", ret);
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DESTROY_MUIC_NOTIFIER_BLOCK(nb);
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return ret;
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}
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static int muic_notifier_notify(void)
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{
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int ret = 0;
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printk(KERN_DEBUG "[muic] %s: CMD=%d, DATA=%d\n", __func__, muic_notifier.cmd,
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muic_notifier.attached_dev);
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ret = blocking_notifier_call_chain(&(muic_notifier.notifier_call_chain),
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muic_notifier.cmd, &(muic_notifier.attached_dev));
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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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printk(KERN_ERR "[muic] %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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printk(KERN_DEBUG "[muic] %s: notify done(0x%x)\n", __func__, ret);
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break;
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default:
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printk(KERN_DEBUG "[muic] %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 muic_notifier_attach_attached_dev(muic_attached_dev_t new_dev)
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{
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printk(KERN_DEBUG "[muic] %s: (%d)\n", __func__, new_dev);
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muic_notifier.cmd = MUIC_NOTIFY_CMD_ATTACH;
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muic_notifier.attached_dev = new_dev;
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/* muic's attached_device attach broadcast */
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muic_notifier_notify();
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}
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void muic_notifier_detach_attached_dev(muic_attached_dev_t cur_dev)
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{
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printk(KERN_DEBUG "[muic] %s: (%d)\n", __func__, cur_dev);
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muic_notifier.cmd = MUIC_NOTIFY_CMD_DETACH;
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if (muic_notifier.attached_dev != cur_dev)
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printk(KERN_DEBUG "[muic] %s: muic_notifier(%d) != muic_data(%d)\n",
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__func__, muic_notifier.attached_dev, cur_dev);
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if (muic_notifier.attached_dev != ATTACHED_DEV_NONE_MUIC) {
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/* muic's attached_device detach broadcast */
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muic_notifier_notify();
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}
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muic_notifier.attached_dev = ATTACHED_DEV_NONE_MUIC;
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}
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void muic_notifier_logically_attach_attached_dev(muic_attached_dev_t new_dev)
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{
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printk(KERN_DEBUG "[muic] %s: (%d)\n", __func__, new_dev);
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muic_notifier.cmd = MUIC_NOTIFY_CMD_LOGICALLY_ATTACH;
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muic_notifier.attached_dev = new_dev;
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/* muic's attached_device attach broadcast */
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muic_notifier_notify();
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}
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void muic_notifier_logically_detach_attached_dev(muic_attached_dev_t cur_dev)
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{
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printk(KERN_DEBUG "[muic] %s: (%d)\n", __func__, cur_dev);
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muic_notifier.cmd = MUIC_NOTIFY_CMD_LOGICALLY_DETACH;
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muic_notifier.attached_dev = cur_dev;
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/* muic's attached_device detach broadcast */
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muic_notifier_notify();
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muic_notifier.attached_dev = ATTACHED_DEV_NONE_MUIC;
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}
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static int __init muic_notifier_init(void)
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{
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int ret = 0;
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printk(KERN_DEBUG "[muic] %s\n", __func__);
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switch_device = device_create(sec_class, NULL, 0, NULL, "switch");
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if (IS_ERR(switch_device)) {
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printk(KERN_ERR "[muic] Failed to create device(switch)!\n");
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ret = -ENODEV;
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goto out;
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}
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BLOCKING_INIT_NOTIFIER_HEAD(&(muic_notifier.notifier_call_chain));
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muic_notifier.cmd = MUIC_NOTIFY_CMD_DETACH;
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muic_notifier.attached_dev = ATTACHED_DEV_UNKNOWN_MUIC;
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out:
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return ret;
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}
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device_initcall(muic_notifier_init);
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