Commit | Line | Data |
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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
13077d80 | 2 | /* power.c: Power management driver. |
1da177e4 | 3 | * |
c510b9bf | 4 | * Copyright (C) 1999, 2007, 2008 David S. Miller (davem@davemloft.net) |
1da177e4 LT |
5 | */ |
6 | ||
1da177e4 | 7 | #include <linux/kernel.h> |
066bcaca | 8 | #include <linux/export.h> |
1da177e4 | 9 | #include <linux/init.h> |
1da177e4 | 10 | #include <linux/interrupt.h> |
a3761780 | 11 | #include <linux/reboot.h> |
263291fa RH |
12 | #include <linux/of.h> |
13 | #include <linux/platform_device.h> | |
1da177e4 | 14 | |
abbce6e2 | 15 | #include <asm/prom.h> |
abbce6e2 | 16 | #include <asm/io.h> |
1da177e4 | 17 | |
1da177e4 LT |
18 | static void __iomem *power_reg; |
19 | ||
13077d80 DM |
20 | static irqreturn_t power_handler(int irq, void *dev_id) |
21 | { | |
a3761780 | 22 | orderly_poweroff(true); |
1da177e4 LT |
23 | |
24 | /* FIXME: Check registers for status... */ | |
25 | return IRQ_HANDLED; | |
26 | } | |
1da177e4 | 27 | |
7c9503b8 | 28 | static int has_button_interrupt(unsigned int irq, struct device_node *dp) |
1da177e4 | 29 | { |
13077d80 | 30 | if (irq == 0xffffffff) |
1da177e4 | 31 | return 0; |
928f4de0 | 32 | if (!of_property_read_bool(dp, "button")) |
1da177e4 LT |
33 | return 0; |
34 | ||
35 | return 1; | |
36 | } | |
37 | ||
7c9503b8 | 38 | static int power_probe(struct platform_device *op) |
1da177e4 | 39 | { |
abbce6e2 | 40 | struct resource *res = &op->resource[0]; |
1636f8ac | 41 | unsigned int irq = op->archdata.irqs[0]; |
a2bd4fd1 | 42 | |
abbce6e2 DM |
43 | power_reg = of_ioremap(res, 0, 0x4, "power"); |
44 | ||
ead1c2bd RH |
45 | printk(KERN_INFO "%pOFn: Control reg at %llx\n", |
46 | op->dev.of_node, res->start); | |
a2bd4fd1 | 47 | |
61c7a080 | 48 | if (has_button_interrupt(irq, op->dev.of_node)) { |
2256c13b | 49 | if (request_irq(irq, |
00cde674 | 50 | power_handler, 0, "power", NULL) < 0) |
13077d80 | 51 | printk(KERN_ERR "power: Cannot setup IRQ handler.\n"); |
1da177e4 | 52 | } |
abbce6e2 DM |
53 | |
54 | return 0; | |
1da177e4 | 55 | } |
a2bd4fd1 | 56 | |
3628aa06 | 57 | static const struct of_device_id power_match[] = { |
a2bd4fd1 DM |
58 | { |
59 | .name = "power", | |
60 | }, | |
61 | {}, | |
62 | }; | |
63 | ||
4ebb24f7 | 64 | static struct platform_driver power_driver = { |
abbce6e2 | 65 | .probe = power_probe, |
4018294b GL |
66 | .driver = { |
67 | .name = "power", | |
4018294b | 68 | .of_match_table = power_match, |
a2cd1558 | 69 | }, |
a2bd4fd1 DM |
70 | }; |
71 | ||
b1ebb975 | 72 | builtin_platform_driver(power_driver); |