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| 2 | |
| 3 | *
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| 4 | * Copyright (C) 1999, 2007, 2008 David S. Miller ([email protected])
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| 5 |
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| 6 |
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| 7 | #include <linux/kernel.h>
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| 8 | #include <linux/export.h>
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| 9 | #include <linux/init.h>
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| 10 | #include <linux/interrupt.h>
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| 11 | #include <linux/reboot.h>
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| 12 | #include <linux/of.h>
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| 13 | #include <linux/platform_device.h>
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| 14 |
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| 15 | #include <asm/prom.h>
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| 16 | #include <asm/io.h>
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| 17 |
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| 18 | static void __iomem *power_reg;
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| 19 |
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| 20 | static irqreturn_t power_handler(int irq, void *dev_id)
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| 21 | {
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| 22 | orderly_poweroff(true);
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| 23 |
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| 24 |
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| 25 | return IRQ_HANDLED;
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| 26 | }
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| 27 |
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| 28 | static int has_button_interrupt(unsigned int irq, struct device_node *dp)
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| 29 | {
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| 30 | if (irq == 0xffffffff)
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| 31 | return 0;
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| 32 | if (!of_property_read_bool(dp, "button"))
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| 33 | return 0;
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| 34 |
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| 35 | return 1;
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| 36 | }
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| 37 |
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| 38 | static int power_probe(struct platform_device *op)
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| 39 | {
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| 40 | struct resource *res = &op->resource[0];
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| 41 | unsigned int irq = op->archdata.irqs[0];
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| 42 |
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| 43 | power_reg = of_ioremap(res, 0, 0x4, "power");
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| 44 |
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| 45 | printk(KERN_INFO "%pOFn: Control reg at %llx\n",
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| 46 | op->dev.of_node, res->start);
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| 47 |
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| 48 | if (has_button_interrupt(irq, op->dev.of_node)) {
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| 49 | if (request_irq(irq,
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| 50 | power_handler, 0, "power", NULL) < 0)
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| 51 | printk(KERN_ERR "power: Cannot setup IRQ handler.\n");
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| 52 | }
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| 53 |
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| 54 | return 0;
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| 55 | }
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| 56 |
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| 57 | static const struct of_device_id power_match[] = {
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| 58 | {
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| 59 | .name = "power",
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| 60 | },
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| 61 | {},
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| 62 | };
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| 63 |
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| 64 | static struct platform_driver power_driver = {
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| 65 | .probe = power_probe,
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| 66 | .driver = {
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| 67 | .name = "power",
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| 68 | .of_match_table = power_match,
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| 69 | },
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| 70 | };
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| 71 |
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| 72 | builtin_platform_driver(power_driver);
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