drivers/parisc/power.c

1 /* SPDX-License-Identifier: GPL-2.0-or-later */
3  * HP PARISC soft power switch driver
5  * Copyright (c) 2001-2023 Helge Deller <deller@gmx.de>
8  *  Support of the soft power switch button may be enabled or disabled at
82 /* filename in /proc which can be used to enable/disable the power switch */
85 /* soft power switch enabled/disabled */
104 			 * Non-Gecko-style machines:  in kpowerswd()
116 			 * Warning: Some machines never reset the DIAG flag, even if  in kpowerswd()
156  * be executed any longer. This function then re-enables
157  * the soft-power switch and allows the user to switch off
165 	/* re-enable the soft-power switch */  in parisc_panic_event()
175 /* qemu soft power-off function */
179 	gsc_writel(0, (unsigned long) data->cb_data);  in qemu_power_off()
194 	/* enable the soft power switch if possible */  in power_init()
199 		soft_power_reg = -1UL;  in power_init()
202 	case 0:		printk(KERN_INFO DRIVER_NAME ": Gecko-style soft power switch enabled.\n");  in power_init()
205 	case -1UL:	printk(KERN_INFO DRIVER_NAME ": Soft power switch support not available.\n");  in power_init()
206 			return -ENODEV;  in power_init()
208 	default:	printk(KERN_INFO DRIVER_NAME ": Soft power switch at 0x%08lx enabled.\n",  in power_init()
222 		return -EIO;  in power_init()
247 MODULE_DESCRIPTION("Soft power switch driver");