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> |
764f2579 | 12 | #include <linux/of_device.h> |
1da177e4 | 13 | |
abbce6e2 | 14 | #include <asm/prom.h> |
abbce6e2 | 15 | #include <asm/io.h> |
1da177e4 | 16 | |
1da177e4 LT |
17 | static void __iomem *power_reg; |
18 | ||
13077d80 DM |
19 | static irqreturn_t power_handler(int irq, void *dev_id) |
20 | { | |
a3761780 | 21 | orderly_poweroff(true); |
1da177e4 LT |
22 | |
23 | /* FIXME: Check registers for status... */ | |
24 | return IRQ_HANDLED; | |
25 | } | |
1da177e4 | 26 | |
7c9503b8 | 27 | static int has_button_interrupt(unsigned int irq, struct device_node *dp) |
1da177e4 | 28 | { |
13077d80 | 29 | if (irq == 0xffffffff) |
1da177e4 | 30 | return 0; |
690c8fd3 | 31 | if (!of_find_property(dp, "button", NULL)) |
1da177e4 LT |
32 | return 0; |
33 | ||
34 | return 1; | |
35 | } | |
36 | ||
7c9503b8 | 37 | static int power_probe(struct platform_device *op) |
1da177e4 | 38 | { |
abbce6e2 | 39 | struct resource *res = &op->resource[0]; |
1636f8ac | 40 | unsigned int irq = op->archdata.irqs[0]; |
a2bd4fd1 | 41 | |
abbce6e2 DM |
42 | power_reg = of_ioremap(res, 0, 0x4, "power"); |
43 | ||
90181136 | 44 | printk(KERN_INFO "%s: Control reg at %llx\n", |
61c7a080 | 45 | op->dev.of_node->name, res->start); |
a2bd4fd1 | 46 | |
61c7a080 | 47 | if (has_button_interrupt(irq, op->dev.of_node)) { |
2256c13b | 48 | if (request_irq(irq, |
00cde674 | 49 | power_handler, 0, "power", NULL) < 0) |
13077d80 | 50 | printk(KERN_ERR "power: Cannot setup IRQ handler.\n"); |
1da177e4 | 51 | } |
abbce6e2 DM |
52 | |
53 | return 0; | |
1da177e4 | 54 | } |
a2bd4fd1 | 55 | |
3628aa06 | 56 | static const struct of_device_id power_match[] = { |
a2bd4fd1 DM |
57 | { |
58 | .name = "power", | |
59 | }, | |
60 | {}, | |
61 | }; | |
62 | ||
4ebb24f7 | 63 | static struct platform_driver power_driver = { |
abbce6e2 | 64 | .probe = power_probe, |
4018294b GL |
65 | .driver = { |
66 | .name = "power", | |
4018294b | 67 | .of_match_table = power_match, |
a2cd1558 | 68 | }, |
a2bd4fd1 DM |
69 | }; |
70 | ||
b1ebb975 | 71 | builtin_platform_driver(power_driver); |