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 <[EMAIL PROTECTED]> Signed-off-by: Arnd Bergmann <[EMAIL PROTECTED]> --- arch/powerpc/platforms/cell/pervasive.c | 70 ++++++++++++++++++++++++++++++- 1 files changed, 69 insertions(+), 1 deletions(-) diff --git a/arch/powerpc/platforms/cell/pervasive.c b/arch/powerpc/platforms/cell/pervasive.c index 8a3631c..e5bd08c 100644 --- a/arch/powerpc/platforms/cell/pervasive.c +++ b/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(struct pt_regs *regs) */ 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); -- 1.5.4.3 -- _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev