130 lines
2.6 KiB
C
Executable File
130 lines
2.6 KiB
C
Executable File
/*
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* Buttons support for Toshiba G900. GPIO buttons
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* based on:
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* Xiao Huang g900_button.c
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*/
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#include <linux/input.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/irq.h>
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#include <linux/platform_device.h>
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#include <linux/gpio_keys.h>
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#include <asm/mach-types.h>
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#include <mach/hardware.h>
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#include <mach/pxa2xx-regs.h>
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#include <mach/g900-gpio.h>
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#include <mach/gpio.h>
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#include <mach/regs-ost.h>
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#include <mach/reset.h>
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#define BTN_POWER GPIO3_BTN_nPower
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static unsigned int noreset;
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module_param(noreset, uint, 0);
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MODULE_PARM_DESC(noreset, "Set 0 = reset, any = no action)"); /* TODO add pm suspend action */
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static void cpu_hw_reset(void)
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{
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/* Initialize the watchdog and let it fire */
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OWER = OWER_WME;
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OSSR = OSSR_M3;
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OSMR3 = OSCR + 368640; /* ... in 100 ms */
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}
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static irqreturn_t pwr_btn_irq(int irq, void *dev_id)
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{
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int state;
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state = GET_GPIO(BTN_POWER);
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if(state){
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printk("g900-power-button: unpress");
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}else{
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if(noreset == 0 )
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{
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cpu_hw_reset();
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}
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}
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printk("g900-power-button: state=%d\n", state);
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return IRQ_HANDLED;
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}
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static int buttons_probe(struct platform_device *pdev)
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{
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int err;
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int irqflag = IRQF_SAMPLE_RANDOM;
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#ifdef CONFIG_PREEMPT_RT
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irqflag |= IRQF_NODELAY;
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#endif
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if (!machine_is_g900())
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return -ENODEV;
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//assign irq and keybit
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set_irq_type(IRQ_GPIO(BTN_POWER), IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING);
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err = request_irq(IRQ_GPIO(BTN_POWER), pwr_btn_irq, irqflag, "g900-gpio-buttons", NULL);
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if (err)
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{
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printk(KERN_ERR "g900-power-button: Cannot assign GPIO(%d) IRQ\n", BTN_POWER);
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return err;
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}
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printk("g900-power-button: *****IRQ %d OK****", IRQ_GPIO(BTN_POWER));
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return 0;
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}
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static int buttons_remove(struct platform_device *pdev)
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{
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free_irq(IRQ_GPIO(BTN_POWER), NULL);
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return 0;
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}
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static int buttons_suspend(struct platform_device *pdev, pm_message_t state)
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{
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return 0;
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}
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static int buttons_resume(struct platform_device *pdev)
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{
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return 0;
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}
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static struct platform_driver buttons_driver = {
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.driver = {
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.name = "g900-power-button",
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},
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.probe = buttons_probe,
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.remove = buttons_remove,
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#ifdef CONFIG_PM
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.suspend = buttons_suspend,
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.resume = buttons_resume,
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#endif
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};
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static int __init buttons_init(void)
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{
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return platform_driver_register(&buttons_driver);
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}
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static void __exit buttons_exit(void)
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{
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platform_driver_unregister(&buttons_driver);
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}
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module_init(buttons_init);
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module_exit(buttons_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Angell FEar<angell@angellfear.ru>");
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MODULE_DESCRIPTION("Power Button driver for Toshiba G900");
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