cell: add support for power button of future IBM cell blades
From: Christian Krafft <hidden>
Date: 2008-06-19 17:35:34
This patch adds support for the power button on future IBM cell blades. It actually doesn't shut down the machine. Instead it exposes an input device /dev/input/event0 to userspace which sends KEY_POWER if power button has been pressed. haldaemon actually recognizes the button, so a plattform independent acpid replacement should handle it correctly. Signed-off-by: Christian Krafft <redacted> Index: linux.git/arch/powerpc/platforms/cell/pervasive.c ===================================================================
--- linux.git.orig/arch/powerpc/platforms/cell/pervasive.c
+++ linux.git/arch/powerpc/platforms/cell/pervasive.c@@ -24,8 +24,10 @@ #undef DEBUG #include <linux/interrupt.h> +#include <linux/input.h> #include <linux/irq.h> #include <linux/percpu.h> +#include <linux/platform_device.h> #include <linux/types.h> #include <linux/kallsyms.h>
@@ -40,6 +42,9 @@ static int sysreset_hack; +static struct input_dev *button_dev; +static struct platform_device *button_pdev; + static void cbe_power_save(void) { unsigned long ctrl, thread_switch_control;
@@ -105,10 +110,21 @@ static int cbe_system_reset_exception(st */ if (sysreset_hack && (cpu = smp_processor_id()) == 0) { pmd = cbe_get_cpu_pmd_regs(cpu); - if (in_be64(&pmd->ras_esc_0) & 0xffff) { + if (in_be64(&pmd->ras_esc_0) & 0x0000ffff) { out_be64(&pmd->ras_esc_0, 0); return 0; } + if (in_be64(&pmd->ras_esc_0) & 0x00010000) { + out_be64(&pmd->ras_esc_0, 0); + if (!button_dev) + return 0; + + input_report_key(button_dev, KEY_POWER, 1); + input_sync(button_dev); + input_report_key(button_dev, KEY_POWER, 0); + input_sync(button_dev); + return 1; + } } break; #ifdef CONFIG_CBE_RAS
@@ -155,3 +171,55 @@ void __init cbe_pervasive_init(void) ppc_md.power_save = cbe_power_save; ppc_md.system_reset_exception = cbe_system_reset_exception; } + +static int __init cbe_power_button_init(void) +{ + int ret; + struct input_dev *dev; + + if (!sysreset_hack) + return 0; + + dev = input_allocate_device(); + if (!dev) { + ret = -ENOMEM; + printk(KERN_ERR "%s: Not enough memory\n", __func__); + goto out; + } + + set_bit(EV_KEY, dev->evbit); + set_bit(KEY_POWER, dev->keybit); + + dev->name = "Power Button"; + dev->id.bustype = BUS_HOST; + + /* this makes the button look like an acpi power button + * no clue whether anyone relies on that though */ + dev->id.product = 0x02; + dev->phys = "LNXPWRBN/button/input0"; + + button_pdev = platform_device_register_simple("power_button", 0, NULL,
0);
+ if (IS_ERR(button_pdev)) {
+ ret = PTR_ERR(button_pdev);
+ goto out_free_input;
+ }
+
+ dev->dev.parent = &button_pdev->dev;
+
+ ret = input_register_device(dev);
+ if (ret) {
+ printk(KERN_ERR "%s: Failed to register device\n", __func__);
+ goto out_free_pdev;
+ }
+
+ button_dev = dev;
+ return ret;
+
+out_free_pdev:
+ platform_device_unregister(button_pdev);
+out_free_input:
+ input_free_device(dev);
+out:
+ return ret;
+}
+device_initcall(cbe_power_button_init);
--
Mit freundlichen Gruessen,
kind regards,
Christian Krafft
IBM Systems & Technology Group,
Linux Kernel Development
IT Specialist
Vorsitzender des Aufsichtsrats: Martin Jetter
Geschaeftsfuehrung: Herbert Kircher
Sitz der Gesellschaft: Boeblingen
Registriergericht: Amtsgericht Stuttgart, HRB 243294 Attachments
- signature.asc [application/pgp-signature] 189 bytes