diff options
Diffstat (limited to 'drivers/platform')
| -rw-r--r-- | drivers/platform/x86/toshiba_acpi.c | 91 |
1 files changed, 91 insertions, 0 deletions
diff --git a/drivers/platform/x86/toshiba_acpi.c b/drivers/platform/x86/toshiba_acpi.c index c3a0c4d0c1dc..802577f43a23 100644 --- a/drivers/platform/x86/toshiba_acpi.c +++ b/drivers/platform/x86/toshiba_acpi.c @@ -50,6 +50,8 @@ #include <linux/acpi.h> #include <linux/dmi.h> #include <linux/uaccess.h> +#include <linux/miscdevice.h> +#include <linux/toshiba.h> #include <acpi/video.h> MODULE_AUTHOR("John Belmonte"); @@ -170,6 +172,7 @@ struct toshiba_acpi_dev { struct led_classdev led_dev; struct led_classdev kbd_led; struct led_classdev eco_led; + struct miscdevice miscdev; int force_fan; int last_key_event; @@ -2240,6 +2243,81 @@ static struct attribute_group toshiba_attr_group = { }; /* + * Misc device + */ +static int toshiba_acpi_smm_bridge(SMMRegisters *regs) +{ + u32 in[TCI_WORDS] = { regs->eax, regs->ebx, regs->ecx, + regs->edx, regs->esi, regs->edi }; + u32 out[TCI_WORDS]; + acpi_status status; + + status = tci_raw(toshiba_acpi, in, out); + if (ACPI_FAILURE(status)) { + pr_err("ACPI call to query SMM registers failed\n"); + return -EIO; + } + + /* Fillout the SMM struct with the TCI call results */ + regs->eax = out[0]; + regs->ebx = out[1]; + regs->ecx = out[2]; + regs->edx = out[3]; + regs->esi = out[4]; + regs->edi = out[5]; + + return 0; +} + +static long toshiba_acpi_ioctl(struct file *fp, unsigned int cmd, + unsigned long arg) +{ + SMMRegisters __user *argp = (SMMRegisters __user *)arg; + SMMRegisters regs; + int ret; + + if (!argp) + return -EINVAL; + + switch (cmd) { + case TOSH_SMM: + if (copy_from_user(®s, argp, sizeof(SMMRegisters))) + return -EFAULT; + ret = toshiba_acpi_smm_bridge(®s); + if (ret) + return ret; + if (copy_to_user(argp, ®s, sizeof(SMMRegisters))) + return -EFAULT; + break; + case TOSHIBA_ACPI_SCI: + if (copy_from_user(®s, argp, sizeof(SMMRegisters))) + return -EFAULT; + /* Ensure we are being called with a SCI_{GET, SET} register */ + if (regs.eax != SCI_GET && regs.eax != SCI_SET) + return -EINVAL; + if (!sci_open(toshiba_acpi)) + return -EIO; + ret = toshiba_acpi_smm_bridge(®s); + sci_close(toshiba_acpi); + if (ret) + return ret; + if (copy_to_user(argp, ®s, sizeof(SMMRegisters))) + return -EFAULT; + break; + default: + return -EINVAL; + } + + return 0; +} + +static const struct file_operations toshiba_acpi_fops = { + .owner = THIS_MODULE, + .unlocked_ioctl = toshiba_acpi_ioctl, + .llseek = noop_llseek, +}; + +/* * Hotkeys */ static int toshiba_acpi_enable_hotkeys(struct toshiba_acpi_dev *dev) @@ -2540,6 +2618,8 @@ static int toshiba_acpi_remove(struct acpi_device *acpi_dev) { struct toshiba_acpi_dev *dev = acpi_driver_data(acpi_dev); + misc_deregister(&dev->miscdev); + remove_toshiba_proc_entries(dev); if (dev->sysfs_created) @@ -2611,6 +2691,17 @@ static int toshiba_acpi_add(struct acpi_device *acpi_dev) return -ENOMEM; dev->acpi_dev = acpi_dev; dev->method_hci = hci_method; + dev->miscdev.minor = MISC_DYNAMIC_MINOR; + dev->miscdev.name = "toshiba_acpi"; + dev->miscdev.fops = &toshiba_acpi_fops; + + ret = misc_register(&dev->miscdev); + if (ret) { + pr_err("Failed to register miscdevice\n"); + kfree(dev); + return ret; + } + acpi_dev->driver_data = dev; dev_set_drvdata(&acpi_dev->dev, dev); |