Hi Bryan,
On 10/15/07, Bryan Wu <[email protected]> wrote:
> +
> +static int ad7142_thread(void *nothing)
> +{
> + do {
> + wait_for_completion(&ad7142_completion);
> + ad7142_decode();
> + enable_irq(CONFIG_BFIN_JOYSTICK_IRQ_PFX);
> + } while (!kthread_should_stop());
> +
No, this is not going to work well:
- you at least need to reinitialize the completion before enabling
IRQ, otherwise you will spin in a very tight loop
- if noone would touch the joystick ad7142_clsoe would() block
infinitely because noone would signal the completion and
ad7142_thread() would never stop.
Completion is just not a good abstraction here... Please use work
abstraction and possibly a separate workqueue.
> +
> + ad7142_task = kthread_run(ad7142_thread, NULL, "ad7142_task");
> + if (IS_ERR(ad7142_task)) {
> + printk(KERN_ERR "serio: Failed to start kseriod\n");
kseriod?
> + return PTR_ERR(ad7142_task);
> + }
> + return 0;
> +}
> +
> +static void ad7142_close(struct input_dev *dev)
> +{
Don't you need to write something over i2c to tell the device to shut
down? As it is now I expect the device to continue raising its IRQ
until kernel decides that it is unhandled and should be ignored.
> + free_irq(CONFIG_BFIN_JOYSTICK_IRQ_PFX, ad7142_interrupt);
Ok, so you freeing IRQ here, but it is allocated in ad7142_probe().
What happen if you try to open device after it was closed?
> + kthread_stop(ad7142_task);
> +}
> +
> +static int __init ad7142_init(void)
> +{
> + return i2c_add_driver(&ad7142_driver);
> +}
> +
> +static void __exit ad7142_exit(void)
> +{
> + i2c_del_driver(&ad7142_driver);
> + input_unregister_device(ad7142_dev);
input_unregister_device() should be in ad7142_detach_client? I am not
sure i2c - there seems to be 2 interface styles and you probably need
to use the new one. I am CC-inj Jean on this.
> +}
> +
> +module_init(ad7142_init);
> +module_exit(ad7142_exit);
> --
> 1.5.3.4
>
--
Dmitry
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