11a59d1b8SThomas Gleixner // SPDX-License-Identifier: GPL-2.0-or-later
231ea7ff0SJaya Kumar /*
331ea7ff0SJaya Kumar * atlas_btns.c - Atlas Wallmount Touchscreen ACPI Extras
431ea7ff0SJaya Kumar *
531ea7ff0SJaya Kumar * Copyright (C) 2006 Jaya Kumar
631ea7ff0SJaya Kumar * Based on Toshiba ACPI by John Belmonte and ASUS ACPI
731ea7ff0SJaya Kumar * This work was sponsored by CIS(M) Sdn Bhd.
831ea7ff0SJaya Kumar */
931ea7ff0SJaya Kumar
10bf77499fSDmitry Torokhov #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
11bf77499fSDmitry Torokhov
1231ea7ff0SJaya Kumar #include <linux/kernel.h>
1331ea7ff0SJaya Kumar #include <linux/module.h>
1431ea7ff0SJaya Kumar #include <linux/input.h>
1531ea7ff0SJaya Kumar #include <linux/types.h>
168b48463fSLv Zheng #include <linux/acpi.h>
177c0f6ba6SLinus Torvalds #include <linux/uaccess.h>
1831ea7ff0SJaya Kumar
1931ea7ff0SJaya Kumar #define ACPI_ATLAS_NAME "Atlas ACPI"
2031ea7ff0SJaya Kumar #define ACPI_ATLAS_CLASS "Atlas"
2131ea7ff0SJaya Kumar
2272341eeaSDmitry Torokhov static unsigned short atlas_keymap[16];
2331ea7ff0SJaya Kumar static struct input_dev *input_dev;
2431ea7ff0SJaya Kumar
2531ea7ff0SJaya Kumar /* button handling code */
acpi_atlas_button_setup(acpi_handle region_handle,u32 function,void * handler_context,void ** return_context)2631ea7ff0SJaya Kumar static acpi_status acpi_atlas_button_setup(acpi_handle region_handle,
2731ea7ff0SJaya Kumar u32 function, void *handler_context, void **return_context)
2831ea7ff0SJaya Kumar {
2931ea7ff0SJaya Kumar *return_context =
3031ea7ff0SJaya Kumar (function != ACPI_REGION_DEACTIVATE) ? handler_context : NULL;
3131ea7ff0SJaya Kumar
3231ea7ff0SJaya Kumar return AE_OK;
3331ea7ff0SJaya Kumar }
3431ea7ff0SJaya Kumar
acpi_atlas_button_handler(u32 function,acpi_physical_address address,u32 bit_width,u64 * value,void * handler_context,void * region_context)3531ea7ff0SJaya Kumar static acpi_status acpi_atlas_button_handler(u32 function,
3631ea7ff0SJaya Kumar acpi_physical_address address,
37439913ffSLin Ming u32 bit_width, u64 *value,
3831ea7ff0SJaya Kumar void *handler_context, void *region_context)
3931ea7ff0SJaya Kumar {
4031ea7ff0SJaya Kumar acpi_status status;
4131ea7ff0SJaya Kumar
4231ea7ff0SJaya Kumar if (function == ACPI_WRITE) {
4372341eeaSDmitry Torokhov int code = address & 0x0f;
4472341eeaSDmitry Torokhov int key_down = !(address & 0x10);
4572341eeaSDmitry Torokhov
4672341eeaSDmitry Torokhov input_event(input_dev, EV_MSC, MSC_SCAN, code);
4772341eeaSDmitry Torokhov input_report_key(input_dev, atlas_keymap[code], key_down);
4831ea7ff0SJaya Kumar input_sync(input_dev);
4972341eeaSDmitry Torokhov
5002b5fac1SAxel Lin status = AE_OK;
5131ea7ff0SJaya Kumar } else {
52bf77499fSDmitry Torokhov pr_warn("shrugged on unexpected function: function=%x,address=%lx,value=%x\n",
5331ea7ff0SJaya Kumar function, (unsigned long)address, (u32)*value);
5402b5fac1SAxel Lin status = AE_BAD_PARAMETER;
5531ea7ff0SJaya Kumar }
5631ea7ff0SJaya Kumar
5731ea7ff0SJaya Kumar return status;
5831ea7ff0SJaya Kumar }
5931ea7ff0SJaya Kumar
atlas_acpi_button_add(struct acpi_device * device)6031ea7ff0SJaya Kumar static int atlas_acpi_button_add(struct acpi_device *device)
6131ea7ff0SJaya Kumar {
6231ea7ff0SJaya Kumar acpi_status status;
6372341eeaSDmitry Torokhov int i;
6431ea7ff0SJaya Kumar int err;
6531ea7ff0SJaya Kumar
6631ea7ff0SJaya Kumar input_dev = input_allocate_device();
6731ea7ff0SJaya Kumar if (!input_dev) {
68bf77499fSDmitry Torokhov pr_err("unable to allocate input device\n");
6931ea7ff0SJaya Kumar return -ENOMEM;
7031ea7ff0SJaya Kumar }
7131ea7ff0SJaya Kumar
7231ea7ff0SJaya Kumar input_dev->name = "Atlas ACPI button driver";
7331ea7ff0SJaya Kumar input_dev->phys = "ASIM0000/atlas/input0";
7431ea7ff0SJaya Kumar input_dev->id.bustype = BUS_HOST;
7572341eeaSDmitry Torokhov input_dev->keycode = atlas_keymap;
7672341eeaSDmitry Torokhov input_dev->keycodesize = sizeof(unsigned short);
7772341eeaSDmitry Torokhov input_dev->keycodemax = ARRAY_SIZE(atlas_keymap);
7831ea7ff0SJaya Kumar
7972341eeaSDmitry Torokhov input_set_capability(input_dev, EV_MSC, MSC_SCAN);
8072341eeaSDmitry Torokhov __set_bit(EV_KEY, input_dev->evbit);
8172341eeaSDmitry Torokhov for (i = 0; i < ARRAY_SIZE(atlas_keymap); i++) {
8272341eeaSDmitry Torokhov if (i < 9) {
8372341eeaSDmitry Torokhov atlas_keymap[i] = KEY_F1 + i;
8472341eeaSDmitry Torokhov __set_bit(KEY_F1 + i, input_dev->keybit);
8572341eeaSDmitry Torokhov } else
8672341eeaSDmitry Torokhov atlas_keymap[i] = KEY_RESERVED;
8772341eeaSDmitry Torokhov }
8831ea7ff0SJaya Kumar
8931ea7ff0SJaya Kumar err = input_register_device(input_dev);
9031ea7ff0SJaya Kumar if (err) {
91bf77499fSDmitry Torokhov pr_err("couldn't register input device\n");
9231ea7ff0SJaya Kumar input_free_device(input_dev);
9331ea7ff0SJaya Kumar return err;
9431ea7ff0SJaya Kumar }
9531ea7ff0SJaya Kumar
9631ea7ff0SJaya Kumar /* hookup button handler */
9731ea7ff0SJaya Kumar status = acpi_install_address_space_handler(device->handle,
9831ea7ff0SJaya Kumar 0x81, &acpi_atlas_button_handler,
9931ea7ff0SJaya Kumar &acpi_atlas_button_setup, device);
10031ea7ff0SJaya Kumar if (ACPI_FAILURE(status)) {
101bf77499fSDmitry Torokhov pr_err("error installing addr spc handler\n");
10231ea7ff0SJaya Kumar input_unregister_device(input_dev);
10302b5fac1SAxel Lin err = -EINVAL;
10431ea7ff0SJaya Kumar }
10531ea7ff0SJaya Kumar
10602b5fac1SAxel Lin return err;
10731ea7ff0SJaya Kumar }
10831ea7ff0SJaya Kumar
atlas_acpi_button_remove(struct acpi_device * device)109*6c0eb5baSDawei Li static void atlas_acpi_button_remove(struct acpi_device *device)
11031ea7ff0SJaya Kumar {
11131ea7ff0SJaya Kumar acpi_status status;
11231ea7ff0SJaya Kumar
11331ea7ff0SJaya Kumar status = acpi_remove_address_space_handler(device->handle,
11431ea7ff0SJaya Kumar 0x81, &acpi_atlas_button_handler);
11502b5fac1SAxel Lin if (ACPI_FAILURE(status))
116bf77499fSDmitry Torokhov pr_err("error removing addr spc handler\n");
11731ea7ff0SJaya Kumar
11831ea7ff0SJaya Kumar input_unregister_device(input_dev);
11931ea7ff0SJaya Kumar }
12031ea7ff0SJaya Kumar
1211ba90e3aSThomas Renninger static const struct acpi_device_id atlas_device_ids[] = {
1221ba90e3aSThomas Renninger {"ASIM0000", 0},
1231ba90e3aSThomas Renninger {"", 0},
1241ba90e3aSThomas Renninger };
1251ba90e3aSThomas Renninger MODULE_DEVICE_TABLE(acpi, atlas_device_ids);
1261ba90e3aSThomas Renninger
12731ea7ff0SJaya Kumar static struct acpi_driver atlas_acpi_driver = {
12831ea7ff0SJaya Kumar .name = ACPI_ATLAS_NAME,
12931ea7ff0SJaya Kumar .class = ACPI_ATLAS_CLASS,
13007d19ffcSAxel Lin .owner = THIS_MODULE,
1311ba90e3aSThomas Renninger .ids = atlas_device_ids,
13231ea7ff0SJaya Kumar .ops = {
13331ea7ff0SJaya Kumar .add = atlas_acpi_button_add,
13431ea7ff0SJaya Kumar .remove = atlas_acpi_button_remove,
13531ea7ff0SJaya Kumar },
13631ea7ff0SJaya Kumar };
137f06efccfSMika Westerberg module_acpi_driver(atlas_acpi_driver);
13831ea7ff0SJaya Kumar
13931ea7ff0SJaya Kumar MODULE_AUTHOR("Jaya Kumar");
14031ea7ff0SJaya Kumar MODULE_LICENSE("GPL");
14131ea7ff0SJaya Kumar MODULE_DESCRIPTION("Atlas button driver");
14231ea7ff0SJaya Kumar
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