diff options
Diffstat (limited to 'drivers/platform/x86/hp/tc1100-wmi.c')
| -rw-r--r-- | drivers/platform/x86/hp/tc1100-wmi.c | 265 |
1 files changed, 265 insertions, 0 deletions
diff --git a/drivers/platform/x86/hp/tc1100-wmi.c b/drivers/platform/x86/hp/tc1100-wmi.c new file mode 100644 index 000000000000..ded26213c420 --- /dev/null +++ b/drivers/platform/x86/hp/tc1100-wmi.c @@ -0,0 +1,265 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * HP Compaq TC1100 Tablet WMI Extras Driver + * + * Copyright (C) 2007 Carlos Corbacho <carlos@strangeworlds.co.uk> + * Copyright (C) 2004 Jamey Hicks <jamey.hicks@hp.com> + * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com> + * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/init.h> +#include <linux/types.h> +#include <linux/acpi.h> +#include <linux/platform_device.h> + +#define GUID "C364AC71-36DB-495A-8494-B439D472A505" + +#define TC1100_INSTANCE_WIRELESS 1 +#define TC1100_INSTANCE_JOGDIAL 2 + +MODULE_AUTHOR("Jamey Hicks, Carlos Corbacho"); +MODULE_DESCRIPTION("HP Compaq TC1100 Tablet WMI Extras"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("wmi:C364AC71-36DB-495A-8494-B439D472A505"); + +static struct platform_device *tc1100_device; + +struct tc1100_data { + u32 wireless; + u32 jogdial; +}; + +#ifdef CONFIG_PM +static struct tc1100_data suspend_data; +#endif + +/* -------------------------------------------------------------------------- + Device Management + -------------------------------------------------------------------------- */ + +static int get_state(u32 *out, u8 instance) +{ + u32 tmp; + acpi_status status; + struct acpi_buffer result = { ACPI_ALLOCATE_BUFFER, NULL }; + union acpi_object *obj; + + if (!out) + return -EINVAL; + + if (instance > 2) + return -ENODEV; + + status = wmi_query_block(GUID, instance, &result); + if (ACPI_FAILURE(status)) + return -ENODEV; + + obj = (union acpi_object *) result.pointer; + if (obj && obj->type == ACPI_TYPE_INTEGER) { + tmp = obj->integer.value; + } else { + tmp = 0; + } + + if (result.length > 0) + kfree(result.pointer); + + switch (instance) { + case TC1100_INSTANCE_WIRELESS: + *out = (tmp == 3) ? 1 : 0; + return 0; + case TC1100_INSTANCE_JOGDIAL: + *out = (tmp == 1) ? 0 : 1; + return 0; + default: + return -ENODEV; + } +} + +static int set_state(u32 *in, u8 instance) +{ + u32 value; + acpi_status status; + struct acpi_buffer input; + + if (!in) + return -EINVAL; + + if (instance > 2) + return -ENODEV; + + switch (instance) { + case TC1100_INSTANCE_WIRELESS: + value = (*in) ? 1 : 2; + break; + case TC1100_INSTANCE_JOGDIAL: + value = (*in) ? 0 : 1; + break; + default: + return -ENODEV; + } + + input.length = sizeof(u32); + input.pointer = &value; + + status = wmi_set_block(GUID, instance, &input); + if (ACPI_FAILURE(status)) + return -ENODEV; + + return 0; +} + +/* -------------------------------------------------------------------------- + FS Interface (/sys) + -------------------------------------------------------------------------- */ + +/* + * Read/ write bool sysfs macro + */ +#define show_set_bool(value, instance) \ +static ssize_t \ +show_bool_##value(struct device *dev, struct device_attribute *attr, \ + char *buf) \ +{ \ + u32 result; \ + acpi_status status = get_state(&result, instance); \ + if (ACPI_SUCCESS(status)) \ + return sprintf(buf, "%d\n", result); \ + return sprintf(buf, "Read error\n"); \ +} \ +\ +static ssize_t \ +set_bool_##value(struct device *dev, struct device_attribute *attr, \ + const char *buf, size_t count) \ +{ \ + u32 tmp = simple_strtoul(buf, NULL, 10); \ + acpi_status status = set_state(&tmp, instance); \ + if (ACPI_FAILURE(status)) \ + return -EINVAL; \ + return count; \ +} \ +static DEVICE_ATTR(value, S_IRUGO | S_IWUSR, \ + show_bool_##value, set_bool_##value); + +show_set_bool(wireless, TC1100_INSTANCE_WIRELESS); +show_set_bool(jogdial, TC1100_INSTANCE_JOGDIAL); + +static struct attribute *tc1100_attributes[] = { + &dev_attr_wireless.attr, + &dev_attr_jogdial.attr, + NULL +}; + +static const struct attribute_group tc1100_attribute_group = { + .attrs = tc1100_attributes, +}; + +/* -------------------------------------------------------------------------- + Driver Model + -------------------------------------------------------------------------- */ + +static int __init tc1100_probe(struct platform_device *device) +{ + return sysfs_create_group(&device->dev.kobj, &tc1100_attribute_group); +} + + +static int tc1100_remove(struct platform_device *device) +{ + sysfs_remove_group(&device->dev.kobj, &tc1100_attribute_group); + + return 0; +} + +#ifdef CONFIG_PM +static int tc1100_suspend(struct device *dev) +{ + int ret; + + ret = get_state(&suspend_data.wireless, TC1100_INSTANCE_WIRELESS); + if (ret) + return ret; + + ret = get_state(&suspend_data.jogdial, TC1100_INSTANCE_JOGDIAL); + if (ret) + return ret; + + return 0; +} + +static int tc1100_resume(struct device *dev) +{ + int ret; + + ret = set_state(&suspend_data.wireless, TC1100_INSTANCE_WIRELESS); + if (ret) + return ret; + + ret = set_state(&suspend_data.jogdial, TC1100_INSTANCE_JOGDIAL); + if (ret) + return ret; + + return 0; +} + +static const struct dev_pm_ops tc1100_pm_ops = { + .suspend = tc1100_suspend, + .resume = tc1100_resume, + .freeze = tc1100_suspend, + .restore = tc1100_resume, +}; +#endif + +static struct platform_driver tc1100_driver = { + .driver = { + .name = "tc1100-wmi", +#ifdef CONFIG_PM + .pm = &tc1100_pm_ops, +#endif + }, + .remove = tc1100_remove, +}; + +static int __init tc1100_init(void) +{ + int error; + + if (!wmi_has_guid(GUID)) + return -ENODEV; + + tc1100_device = platform_device_alloc("tc1100-wmi", PLATFORM_DEVID_NONE); + if (!tc1100_device) + return -ENOMEM; + + error = platform_device_add(tc1100_device); + if (error) + goto err_device_put; + + error = platform_driver_probe(&tc1100_driver, tc1100_probe); + if (error) + goto err_device_del; + + pr_info("HP Compaq TC1100 Tablet WMI Extras loaded\n"); + return 0; + + err_device_del: + platform_device_del(tc1100_device); + err_device_put: + platform_device_put(tc1100_device); + return error; +} + +static void __exit tc1100_exit(void) +{ + platform_device_unregister(tc1100_device); + platform_driver_unregister(&tc1100_driver); +} + +module_init(tc1100_init); +module_exit(tc1100_exit); |