161cd4822SLejun Zhu /* 261cd4822SLejun Zhu * Supports for the button array on SoC tablets originally running 361cd4822SLejun Zhu * Windows 8. 461cd4822SLejun Zhu * 561cd4822SLejun Zhu * (C) Copyright 2014 Intel Corporation 661cd4822SLejun Zhu * 761cd4822SLejun Zhu * This program is free software; you can redistribute it and/or 861cd4822SLejun Zhu * modify it under the terms of the GNU General Public License 961cd4822SLejun Zhu * as published by the Free Software Foundation; version 2 1061cd4822SLejun Zhu * of the License. 1161cd4822SLejun Zhu */ 1261cd4822SLejun Zhu 1361cd4822SLejun Zhu #include <linux/module.h> 1461cd4822SLejun Zhu #include <linux/input.h> 1561cd4822SLejun Zhu #include <linux/init.h> 1661cd4822SLejun Zhu #include <linux/kernel.h> 1761cd4822SLejun Zhu #include <linux/acpi.h> 1861cd4822SLejun Zhu #include <linux/gpio/consumer.h> 1961cd4822SLejun Zhu #include <linux/gpio_keys.h> 20be8e7a7eSBenjamin Tissoires #include <linux/gpio.h> 2161cd4822SLejun Zhu #include <linux/platform_device.h> 2261cd4822SLejun Zhu 2361cd4822SLejun Zhu struct soc_button_info { 2461cd4822SLejun Zhu const char *name; 2561cd4822SLejun Zhu int acpi_index; 2661cd4822SLejun Zhu unsigned int event_type; 2761cd4822SLejun Zhu unsigned int event_code; 2861cd4822SLejun Zhu bool autorepeat; 2961cd4822SLejun Zhu bool wakeup; 3061cd4822SLejun Zhu }; 3161cd4822SLejun Zhu 3261cd4822SLejun Zhu /* 3361cd4822SLejun Zhu * Some of the buttons like volume up/down are auto repeat, while others 3461cd4822SLejun Zhu * are not. To support both, we register two platform devices, and put 3561cd4822SLejun Zhu * buttons into them based on whether the key should be auto repeat. 3661cd4822SLejun Zhu */ 3761cd4822SLejun Zhu #define BUTTON_TYPES 2 3861cd4822SLejun Zhu 3961cd4822SLejun Zhu struct soc_button_data { 4061cd4822SLejun Zhu struct platform_device *children[BUTTON_TYPES]; 4161cd4822SLejun Zhu }; 4261cd4822SLejun Zhu 4361cd4822SLejun Zhu /* 4461cd4822SLejun Zhu * Get the Nth GPIO number from the ACPI object. 4561cd4822SLejun Zhu */ 4661cd4822SLejun Zhu static int soc_button_lookup_gpio(struct device *dev, int acpi_index) 4761cd4822SLejun Zhu { 4861cd4822SLejun Zhu struct gpio_desc *desc; 4961cd4822SLejun Zhu int gpio; 5061cd4822SLejun Zhu 51a01cd170SHans de Goede desc = gpiod_get_index(dev, NULL, acpi_index, GPIOD_ASIS); 5261cd4822SLejun Zhu if (IS_ERR(desc)) 5361cd4822SLejun Zhu return PTR_ERR(desc); 5461cd4822SLejun Zhu 5561cd4822SLejun Zhu gpio = desc_to_gpio(desc); 5661cd4822SLejun Zhu 5761cd4822SLejun Zhu gpiod_put(desc); 5861cd4822SLejun Zhu 5961cd4822SLejun Zhu return gpio; 6061cd4822SLejun Zhu } 6161cd4822SLejun Zhu 6261cd4822SLejun Zhu static struct platform_device * 63042e1c79SJin Yao soc_button_device_create(struct platform_device *pdev, 6461cd4822SLejun Zhu const struct soc_button_info *button_info, 6561cd4822SLejun Zhu bool autorepeat) 6661cd4822SLejun Zhu { 6761cd4822SLejun Zhu const struct soc_button_info *info; 6861cd4822SLejun Zhu struct platform_device *pd; 6961cd4822SLejun Zhu struct gpio_keys_button *gpio_keys; 7061cd4822SLejun Zhu struct gpio_keys_platform_data *gpio_keys_pdata; 7161cd4822SLejun Zhu int n_buttons = 0; 7261cd4822SLejun Zhu int gpio; 7361cd4822SLejun Zhu int error; 7461cd4822SLejun Zhu 757283b47dSHans de Goede for (info = button_info; info->name; info++) 767283b47dSHans de Goede if (info->autorepeat == autorepeat) 777283b47dSHans de Goede n_buttons++; 787283b47dSHans de Goede 7961cd4822SLejun Zhu gpio_keys_pdata = devm_kzalloc(&pdev->dev, 8061cd4822SLejun Zhu sizeof(*gpio_keys_pdata) + 817283b47dSHans de Goede sizeof(*gpio_keys) * n_buttons, 8261cd4822SLejun Zhu GFP_KERNEL); 8391cf07cdSPramod Gurav if (!gpio_keys_pdata) 8491cf07cdSPramod Gurav return ERR_PTR(-ENOMEM); 8591cf07cdSPramod Gurav 8661cd4822SLejun Zhu gpio_keys = (void *)(gpio_keys_pdata + 1); 877283b47dSHans de Goede n_buttons = 0; 8861cd4822SLejun Zhu 8961cd4822SLejun Zhu for (info = button_info; info->name; info++) { 9061cd4822SLejun Zhu if (info->autorepeat != autorepeat) 9161cd4822SLejun Zhu continue; 9261cd4822SLejun Zhu 9361cd4822SLejun Zhu gpio = soc_button_lookup_gpio(&pdev->dev, info->acpi_index); 94be8e7a7eSBenjamin Tissoires if (!gpio_is_valid(gpio)) 9561cd4822SLejun Zhu continue; 9661cd4822SLejun Zhu 9761cd4822SLejun Zhu gpio_keys[n_buttons].type = info->event_type; 9861cd4822SLejun Zhu gpio_keys[n_buttons].code = info->event_code; 9961cd4822SLejun Zhu gpio_keys[n_buttons].gpio = gpio; 10061cd4822SLejun Zhu gpio_keys[n_buttons].active_low = 1; 10161cd4822SLejun Zhu gpio_keys[n_buttons].desc = info->name; 10261cd4822SLejun Zhu gpio_keys[n_buttons].wakeup = info->wakeup; 1035c4fa2a6SHans de Goede /* These devices often use cheap buttons, use 50 ms debounce */ 1045c4fa2a6SHans de Goede gpio_keys[n_buttons].debounce_interval = 50; 10561cd4822SLejun Zhu n_buttons++; 10661cd4822SLejun Zhu } 10761cd4822SLejun Zhu 10861cd4822SLejun Zhu if (n_buttons == 0) { 10961cd4822SLejun Zhu error = -ENODEV; 11061cd4822SLejun Zhu goto err_free_mem; 11161cd4822SLejun Zhu } 11261cd4822SLejun Zhu 11361cd4822SLejun Zhu gpio_keys_pdata->buttons = gpio_keys; 11461cd4822SLejun Zhu gpio_keys_pdata->nbuttons = n_buttons; 11561cd4822SLejun Zhu gpio_keys_pdata->rep = autorepeat; 11661cd4822SLejun Zhu 11761cd4822SLejun Zhu pd = platform_device_alloc("gpio-keys", PLATFORM_DEVID_AUTO); 11861cd4822SLejun Zhu if (!pd) { 11961cd4822SLejun Zhu error = -ENOMEM; 12061cd4822SLejun Zhu goto err_free_mem; 12161cd4822SLejun Zhu } 12261cd4822SLejun Zhu 12361cd4822SLejun Zhu error = platform_device_add_data(pd, gpio_keys_pdata, 12461cd4822SLejun Zhu sizeof(*gpio_keys_pdata)); 12561cd4822SLejun Zhu if (error) 12661cd4822SLejun Zhu goto err_free_pdev; 12761cd4822SLejun Zhu 12861cd4822SLejun Zhu error = platform_device_add(pd); 12961cd4822SLejun Zhu if (error) 13061cd4822SLejun Zhu goto err_free_pdev; 13161cd4822SLejun Zhu 13261cd4822SLejun Zhu return pd; 13361cd4822SLejun Zhu 13461cd4822SLejun Zhu err_free_pdev: 13561cd4822SLejun Zhu platform_device_put(pd); 13661cd4822SLejun Zhu err_free_mem: 13761cd4822SLejun Zhu devm_kfree(&pdev->dev, gpio_keys_pdata); 13861cd4822SLejun Zhu return ERR_PTR(error); 13961cd4822SLejun Zhu } 14061cd4822SLejun Zhu 1414c3362f4SHans de Goede static int soc_button_get_acpi_object_int(const union acpi_object *obj) 1424c3362f4SHans de Goede { 1434c3362f4SHans de Goede if (obj->type != ACPI_TYPE_INTEGER) 1444c3362f4SHans de Goede return -1; 1454c3362f4SHans de Goede 1464c3362f4SHans de Goede return obj->integer.value; 1474c3362f4SHans de Goede } 1484c3362f4SHans de Goede 1494c3362f4SHans de Goede /* Parse a single ACPI0011 _DSD button descriptor */ 1504c3362f4SHans de Goede static int soc_button_parse_btn_desc(struct device *dev, 1514c3362f4SHans de Goede const union acpi_object *desc, 1524c3362f4SHans de Goede int collection_uid, 1534c3362f4SHans de Goede struct soc_button_info *info) 1544c3362f4SHans de Goede { 1554c3362f4SHans de Goede int upage, usage; 1564c3362f4SHans de Goede 1574c3362f4SHans de Goede if (desc->type != ACPI_TYPE_PACKAGE || 1584c3362f4SHans de Goede desc->package.count != 5 || 1594c3362f4SHans de Goede /* First byte should be 1 (control) */ 1604c3362f4SHans de Goede soc_button_get_acpi_object_int(&desc->package.elements[0]) != 1 || 1614c3362f4SHans de Goede /* Third byte should be collection uid */ 1624c3362f4SHans de Goede soc_button_get_acpi_object_int(&desc->package.elements[2]) != 1634c3362f4SHans de Goede collection_uid) { 1644c3362f4SHans de Goede dev_err(dev, "Invalid ACPI Button Descriptor\n"); 1654c3362f4SHans de Goede return -ENODEV; 1664c3362f4SHans de Goede } 1674c3362f4SHans de Goede 1684c3362f4SHans de Goede info->event_type = EV_KEY; 1694c3362f4SHans de Goede info->acpi_index = 1704c3362f4SHans de Goede soc_button_get_acpi_object_int(&desc->package.elements[1]); 1714c3362f4SHans de Goede upage = soc_button_get_acpi_object_int(&desc->package.elements[3]); 1724c3362f4SHans de Goede usage = soc_button_get_acpi_object_int(&desc->package.elements[4]); 1734c3362f4SHans de Goede 1744c3362f4SHans de Goede /* 1754c3362f4SHans de Goede * The UUID: fa6bd625-9ce8-470d-a2c7-b3ca36c4282e descriptors use HID 1764c3362f4SHans de Goede * usage page and usage codes, but otherwise the device is not HID 1774c3362f4SHans de Goede * compliant: it uses one irq per button instead of generating HID 1784c3362f4SHans de Goede * input reports and some buttons should generate wakeups where as 1794c3362f4SHans de Goede * others should not, so we cannot use the HID subsystem. 1804c3362f4SHans de Goede * 1814c3362f4SHans de Goede * Luckily all devices only use a few usage page + usage combinations, 1824c3362f4SHans de Goede * so we can simply check for the known combinations here. 1834c3362f4SHans de Goede */ 1844c3362f4SHans de Goede if (upage == 0x01 && usage == 0x81) { 1854c3362f4SHans de Goede info->name = "power"; 1864c3362f4SHans de Goede info->event_code = KEY_POWER; 1874c3362f4SHans de Goede info->wakeup = true; 1884c3362f4SHans de Goede } else if (upage == 0x07 && usage == 0xe3) { 1894c3362f4SHans de Goede info->name = "home"; 1904c3362f4SHans de Goede info->event_code = KEY_HOMEPAGE; 1914c3362f4SHans de Goede info->wakeup = true; 1924c3362f4SHans de Goede } else if (upage == 0x0c && usage == 0xe9) { 1934c3362f4SHans de Goede info->name = "volume_up"; 1944c3362f4SHans de Goede info->event_code = KEY_VOLUMEUP; 1954c3362f4SHans de Goede info->autorepeat = true; 1964c3362f4SHans de Goede } else if (upage == 0x0c && usage == 0xea) { 1974c3362f4SHans de Goede info->name = "volume_down"; 1984c3362f4SHans de Goede info->event_code = KEY_VOLUMEDOWN; 1994c3362f4SHans de Goede info->autorepeat = true; 2004c3362f4SHans de Goede } else { 2014c3362f4SHans de Goede dev_warn(dev, "Unknown button index %d upage %02x usage %02x, ignoring\n", 2024c3362f4SHans de Goede info->acpi_index, upage, usage); 2034c3362f4SHans de Goede info->name = "unknown"; 2044c3362f4SHans de Goede info->event_code = KEY_RESERVED; 2054c3362f4SHans de Goede } 2064c3362f4SHans de Goede 2074c3362f4SHans de Goede return 0; 2084c3362f4SHans de Goede } 2094c3362f4SHans de Goede 2104c3362f4SHans de Goede /* ACPI0011 _DSD btns descriptors UUID: fa6bd625-9ce8-470d-a2c7-b3ca36c4282e */ 2114c3362f4SHans de Goede static const u8 btns_desc_uuid[16] = { 2124c3362f4SHans de Goede 0x25, 0xd6, 0x6b, 0xfa, 0xe8, 0x9c, 0x0d, 0x47, 2134c3362f4SHans de Goede 0xa2, 0xc7, 0xb3, 0xca, 0x36, 0xc4, 0x28, 0x2e 2144c3362f4SHans de Goede }; 2154c3362f4SHans de Goede 2164c3362f4SHans de Goede /* Parse ACPI0011 _DSD button descriptors */ 2174c3362f4SHans de Goede static struct soc_button_info *soc_button_get_button_info(struct device *dev) 2184c3362f4SHans de Goede { 2194c3362f4SHans de Goede struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER }; 2204c3362f4SHans de Goede const union acpi_object *desc, *el0, *uuid, *btns_desc = NULL; 2214c3362f4SHans de Goede struct soc_button_info *button_info; 2224c3362f4SHans de Goede acpi_status status; 2234c3362f4SHans de Goede int i, btn, collection_uid = -1; 2244c3362f4SHans de Goede 2254c3362f4SHans de Goede status = acpi_evaluate_object_typed(ACPI_HANDLE(dev), "_DSD", NULL, 2264c3362f4SHans de Goede &buf, ACPI_TYPE_PACKAGE); 2274c3362f4SHans de Goede if (ACPI_FAILURE(status)) { 2284c3362f4SHans de Goede dev_err(dev, "ACPI _DSD object not found\n"); 2294c3362f4SHans de Goede return ERR_PTR(-ENODEV); 2304c3362f4SHans de Goede } 2314c3362f4SHans de Goede 2324c3362f4SHans de Goede /* Look for the Button Descriptors UUID */ 2334c3362f4SHans de Goede desc = buf.pointer; 2344c3362f4SHans de Goede for (i = 0; (i + 1) < desc->package.count; i += 2) { 2354c3362f4SHans de Goede uuid = &desc->package.elements[i]; 2364c3362f4SHans de Goede 2374c3362f4SHans de Goede if (uuid->type != ACPI_TYPE_BUFFER || 2384c3362f4SHans de Goede uuid->buffer.length != 16 || 2394c3362f4SHans de Goede desc->package.elements[i + 1].type != ACPI_TYPE_PACKAGE) { 2404c3362f4SHans de Goede break; 2414c3362f4SHans de Goede } 2424c3362f4SHans de Goede 2434c3362f4SHans de Goede if (memcmp(uuid->buffer.pointer, btns_desc_uuid, 16) == 0) { 2444c3362f4SHans de Goede btns_desc = &desc->package.elements[i + 1]; 2454c3362f4SHans de Goede break; 2464c3362f4SHans de Goede } 2474c3362f4SHans de Goede } 2484c3362f4SHans de Goede 2494c3362f4SHans de Goede if (!btns_desc) { 2504c3362f4SHans de Goede dev_err(dev, "ACPI Button Descriptors not found\n"); 2514c3362f4SHans de Goede return ERR_PTR(-ENODEV); 2524c3362f4SHans de Goede } 2534c3362f4SHans de Goede 2544c3362f4SHans de Goede /* The first package describes the collection */ 2554c3362f4SHans de Goede el0 = &btns_desc->package.elements[0]; 2564c3362f4SHans de Goede if (el0->type == ACPI_TYPE_PACKAGE && 2574c3362f4SHans de Goede el0->package.count == 5 && 2584c3362f4SHans de Goede /* First byte should be 0 (collection) */ 2594c3362f4SHans de Goede soc_button_get_acpi_object_int(&el0->package.elements[0]) == 0 && 2604c3362f4SHans de Goede /* Third byte should be 0 (top level collection) */ 2614c3362f4SHans de Goede soc_button_get_acpi_object_int(&el0->package.elements[2]) == 0) { 2624c3362f4SHans de Goede collection_uid = soc_button_get_acpi_object_int( 2634c3362f4SHans de Goede &el0->package.elements[1]); 2644c3362f4SHans de Goede } 2654c3362f4SHans de Goede if (collection_uid == -1) { 2664c3362f4SHans de Goede dev_err(dev, "Invalid Button Collection Descriptor\n"); 2674c3362f4SHans de Goede return ERR_PTR(-ENODEV); 2684c3362f4SHans de Goede } 2694c3362f4SHans de Goede 2704c3362f4SHans de Goede /* There are package.count - 1 buttons + 1 terminating empty entry */ 2714c3362f4SHans de Goede button_info = devm_kcalloc(dev, btns_desc->package.count, 2724c3362f4SHans de Goede sizeof(*button_info), GFP_KERNEL); 2734c3362f4SHans de Goede if (!button_info) 2744c3362f4SHans de Goede return ERR_PTR(-ENOMEM); 2754c3362f4SHans de Goede 2764c3362f4SHans de Goede /* Parse the button descriptors */ 2774c3362f4SHans de Goede for (i = 1, btn = 0; i < btns_desc->package.count; i++, btn++) { 2784c3362f4SHans de Goede if (soc_button_parse_btn_desc(dev, 2794c3362f4SHans de Goede &btns_desc->package.elements[i], 2804c3362f4SHans de Goede collection_uid, 2814c3362f4SHans de Goede &button_info[btn])) 2824c3362f4SHans de Goede return ERR_PTR(-ENODEV); 2834c3362f4SHans de Goede } 2844c3362f4SHans de Goede 2854c3362f4SHans de Goede return button_info; 2864c3362f4SHans de Goede } 2874c3362f4SHans de Goede 288042e1c79SJin Yao static int soc_button_remove(struct platform_device *pdev) 28961cd4822SLejun Zhu { 290042e1c79SJin Yao struct soc_button_data *priv = platform_get_drvdata(pdev); 291042e1c79SJin Yao 29261cd4822SLejun Zhu int i; 29361cd4822SLejun Zhu 29461cd4822SLejun Zhu for (i = 0; i < BUTTON_TYPES; i++) 29561cd4822SLejun Zhu if (priv->children[i]) 29661cd4822SLejun Zhu platform_device_unregister(priv->children[i]); 297042e1c79SJin Yao 298042e1c79SJin Yao return 0; 29961cd4822SLejun Zhu } 30061cd4822SLejun Zhu 301042e1c79SJin Yao static int soc_button_probe(struct platform_device *pdev) 30261cd4822SLejun Zhu { 303042e1c79SJin Yao struct device *dev = &pdev->dev; 304042e1c79SJin Yao const struct acpi_device_id *id; 305042e1c79SJin Yao struct soc_button_info *button_info; 30661cd4822SLejun Zhu struct soc_button_data *priv; 30761cd4822SLejun Zhu struct platform_device *pd; 30861cd4822SLejun Zhu int i; 30961cd4822SLejun Zhu int error; 31061cd4822SLejun Zhu 311042e1c79SJin Yao id = acpi_match_device(dev->driver->acpi_match_table, dev); 312042e1c79SJin Yao if (!id) 313042e1c79SJin Yao return -ENODEV; 314042e1c79SJin Yao 3154c3362f4SHans de Goede if (!id->driver_data) { 3164c3362f4SHans de Goede button_info = soc_button_get_button_info(dev); 3174c3362f4SHans de Goede if (IS_ERR(button_info)) 3184c3362f4SHans de Goede return PTR_ERR(button_info); 3194c3362f4SHans de Goede } else { 320042e1c79SJin Yao button_info = (struct soc_button_info *)id->driver_data; 3214c3362f4SHans de Goede } 322042e1c79SJin Yao 323a01cd170SHans de Goede if (gpiod_count(dev, NULL) <= 0) { 324aa45590aSGuenter Roeck dev_dbg(dev, "no GPIO attached, ignoring...\n"); 3253d5a9437SBenjamin Tissoires return -ENODEV; 3263d5a9437SBenjamin Tissoires } 3273d5a9437SBenjamin Tissoires 328aa45590aSGuenter Roeck priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); 32961cd4822SLejun Zhu if (!priv) 33061cd4822SLejun Zhu return -ENOMEM; 33161cd4822SLejun Zhu 332042e1c79SJin Yao platform_set_drvdata(pdev, priv); 33361cd4822SLejun Zhu 33461cd4822SLejun Zhu for (i = 0; i < BUTTON_TYPES; i++) { 33561cd4822SLejun Zhu pd = soc_button_device_create(pdev, button_info, i == 0); 33661cd4822SLejun Zhu if (IS_ERR(pd)) { 33761cd4822SLejun Zhu error = PTR_ERR(pd); 33861cd4822SLejun Zhu if (error != -ENODEV) { 33961cd4822SLejun Zhu soc_button_remove(pdev); 34061cd4822SLejun Zhu return error; 34161cd4822SLejun Zhu } 3427740fc52SLejun Zhu continue; 34361cd4822SLejun Zhu } 34461cd4822SLejun Zhu 34561cd4822SLejun Zhu priv->children[i] = pd; 34661cd4822SLejun Zhu } 34761cd4822SLejun Zhu 34861cd4822SLejun Zhu if (!priv->children[0] && !priv->children[1]) 34961cd4822SLejun Zhu return -ENODEV; 35061cd4822SLejun Zhu 3514c3362f4SHans de Goede if (!id->driver_data) 3524c3362f4SHans de Goede devm_kfree(dev, button_info); 3534c3362f4SHans de Goede 35461cd4822SLejun Zhu return 0; 35561cd4822SLejun Zhu } 35661cd4822SLejun Zhu 3577283b47dSHans de Goede /* 3587283b47dSHans de Goede * Definition of buttons on the tablet. The ACPI index of each button 3597283b47dSHans de Goede * is defined in section 2.8.7.2 of "Windows ACPI Design Guide for SoC 3607283b47dSHans de Goede * Platforms" 3617283b47dSHans de Goede */ 36261cd4822SLejun Zhu static struct soc_button_info soc_button_PNP0C40[] = { 36361cd4822SLejun Zhu { "power", 0, EV_KEY, KEY_POWER, false, true }, 364791738beSBastien Nocera { "home", 1, EV_KEY, KEY_LEFTMETA, false, true }, 36561cd4822SLejun Zhu { "volume_up", 2, EV_KEY, KEY_VOLUMEUP, true, false }, 36661cd4822SLejun Zhu { "volume_down", 3, EV_KEY, KEY_VOLUMEDOWN, true, false }, 36761cd4822SLejun Zhu { "rotation_lock", 4, EV_SW, SW_ROTATE_LOCK, false, false }, 36861cd4822SLejun Zhu { } 36961cd4822SLejun Zhu }; 37061cd4822SLejun Zhu 371042e1c79SJin Yao static const struct acpi_device_id soc_button_acpi_match[] = { 372042e1c79SJin Yao { "PNP0C40", (unsigned long)soc_button_PNP0C40 }, 3734c3362f4SHans de Goede { "ACPI0011", 0 }, 374042e1c79SJin Yao { } 37561cd4822SLejun Zhu }; 37661cd4822SLejun Zhu 377042e1c79SJin Yao MODULE_DEVICE_TABLE(acpi, soc_button_acpi_match); 378042e1c79SJin Yao 379042e1c79SJin Yao static struct platform_driver soc_button_driver = { 380042e1c79SJin Yao .probe = soc_button_probe, 38161cd4822SLejun Zhu .remove = soc_button_remove, 382042e1c79SJin Yao .driver = { 383042e1c79SJin Yao .name = KBUILD_MODNAME, 384042e1c79SJin Yao .acpi_match_table = ACPI_PTR(soc_button_acpi_match), 385042e1c79SJin Yao }, 38661cd4822SLejun Zhu }; 387042e1c79SJin Yao module_platform_driver(soc_button_driver); 38861cd4822SLejun Zhu 38961cd4822SLejun Zhu MODULE_LICENSE("GPL"); 390