diff options
Diffstat (limited to '')
-rw-r--r-- | arch/sparc/kernel/power.c | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/arch/sparc/kernel/power.c b/arch/sparc/kernel/power.c new file mode 100644 index 000000000..d941875dd --- /dev/null +++ b/arch/sparc/kernel/power.c @@ -0,0 +1,71 @@ +// SPDX-License-Identifier: GPL-2.0 +/* power.c: Power management driver. + * + * Copyright (C) 1999, 2007, 2008 David S. Miller (davem@davemloft.net) + */ + +#include <linux/kernel.h> +#include <linux/export.h> +#include <linux/init.h> +#include <linux/interrupt.h> +#include <linux/reboot.h> +#include <linux/of_device.h> + +#include <asm/prom.h> +#include <asm/io.h> + +static void __iomem *power_reg; + +static irqreturn_t power_handler(int irq, void *dev_id) +{ + orderly_poweroff(true); + + /* FIXME: Check registers for status... */ + return IRQ_HANDLED; +} + +static int has_button_interrupt(unsigned int irq, struct device_node *dp) +{ + if (irq == 0xffffffff) + return 0; + if (!of_find_property(dp, "button", NULL)) + return 0; + + return 1; +} + +static int power_probe(struct platform_device *op) +{ + struct resource *res = &op->resource[0]; + unsigned int irq = op->archdata.irqs[0]; + + power_reg = of_ioremap(res, 0, 0x4, "power"); + + printk(KERN_INFO "%pOFn: Control reg at %llx\n", + op->dev.of_node, res->start); + + if (has_button_interrupt(irq, op->dev.of_node)) { + if (request_irq(irq, + power_handler, 0, "power", NULL) < 0) + printk(KERN_ERR "power: Cannot setup IRQ handler.\n"); + } + + return 0; +} + +static const struct of_device_id power_match[] = { + { + .name = "power", + }, + {}, +}; + +static struct platform_driver power_driver = { + .probe = power_probe, + .driver = { + .name = "power", + .of_match_table = power_match, + }, +}; + +builtin_platform_driver(power_driver); |