thinkpad_acpi: Add support for keyboard backlight

Message ID	1450982818-11694-1-git-send-email-pali.rohar@gmail.com (mailing list archive)
State	Superseded, archived
Headers	show Return-Path: <platform-driver-x86-owner@kernel.org> From: =?UTF-8?q?Pali=20Roh=C3=A1r?= <pali.rohar@gmail.com> To: Henrique de Moraes Holschuh <ibm-acpi@hmh.eng.br>, Darren Hart <dvhart@infradead.org> Cc: ibm-acpi-devel@lists.sourceforge.net, platform-driver-x86@vger.kernel.org, linux-kernel@vger.kernel.org, Fabio D'Urso <fabiodurso@hotmail.it>, =?UTF-8?q?Pali=20Roh=C3=A1r?= <pali.rohar@gmail.com> Subject: [PATCH] thinkpad_acpi: Add support for keyboard backlight Date: Thu, 24 Dec 2015 19:46:57 +0100 Message-Id: <1450982818-11694-1-git-send-email-pali.rohar@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: platform-driver-x86-owner@vger.kernel.org Precedence: bulk

diff --git a/drivers/platform/x86/thinkpad_acpi.c b/drivers/platform/x86/thinkpad_acpi.c index 0bed473..477afa1 100644 --- a/drivers/platform/x86/thinkpad_acpi.c +++ b/drivers/platform/x86/thinkpad_acpi.c @@ -303,6 +303,7 @@ static struct { u32 hotkey_mask:1; u32 hotkey_wlsw:1; u32 hotkey_tablet:1; + u32 kbdlight:1; u32 light:1; u32 light_status:1; u32 bright_acpimode:1; @@ -4986,6 +4987,206 @@ static struct ibm_struct video_driver_data = { #endif /* CONFIG_THINKPAD_ACPI_VIDEO */ /************************************************************************* + * Keyboard backlight subdriver + */ + +static int kbdlight_set_level(int level) +{ + if (!hkey_handle) + return -ENXIO; + + if (!acpi_evalf(hkey_handle, NULL, "MLCS", "dd", level)) + return -EIO; + + return 0; +} + +static int kbdlight_get_level(void) +{ + int status = 0; + + if (!hkey_handle) + return -ENXIO; + + if (!acpi_evalf(hkey_handle, &status, "MLCG", "dd", 0)) + return -EIO; + + if (status < 0) + return status; + + return status & 0x3; +} + +static bool kbdlight_is_supported(void) +{ + int status = 0; + + if (!hkey_handle) + return false; + + if (!acpi_has_method(hkey_handle, "MLCG")) { + vdbg_printk(TPACPI_DBG_INIT, "kbdlight MLCG is unavailable\n"); + return false; + } + + if (!acpi_evalf(hkey_handle, &status, "MLCG", "qdd", 0)) { + vdbg_printk(TPACPI_DBG_INIT, "kbdlight MLCG failed\n"); + return false; + } + + if (status < 0) { + vdbg_printk(TPACPI_DBG_INIT, "kbdlight MLCG err: %d\n", status); + return false; + } + + vdbg_printk(TPACPI_DBG_INIT, "kbdlight MLCG returned 0x%x\n", status); + /* + * Guessed test for keyboard backlight: + * + * Machines with backlight keyboard return: + * b010100000010000000XX - ThinkPad X1 Carbon 3rd + * b110100010010000000XX - ThinkPad x230 + * b010100000010000000XX - ThinkPad x240 + * b010100000010000000XX - ThinkPad W541 + * (XX is current backlight level) + * + * Machines without backlight keyboard return: + * b10100001000000000000 - ThinkPad x230 + * b10110001000000000000 - ThinkPad E430 + * b00000000000000000000 - ThinkPad E450 + * + * Candidate BITs for detection test (XOR): + * b01000000001000000000 + * ^ + */ + return status & BIT(9); +} + +static void kbdlight_set_worker(struct work_struct *work) +{ + struct tpacpi_led_classdev *data = + container_of(work, struct tpacpi_led_classdev, work); + + if (likely(tpacpi_lifecycle == TPACPI_LIFE_RUNNING)) + kbdlight_set_level(data->new_state); +} + +static void kbdlight_sysfs_set(struct led_classdev *led_cdev, + enum led_brightness brightness) +{ + struct tpacpi_led_classdev *data = + container_of(led_cdev, + struct tpacpi_led_classdev, + led_classdev); + data->new_state = brightness; + queue_work(tpacpi_wq, &data->work); +} + +static enum led_brightness kbdlight_sysfs_get(struct led_classdev *led_cdev) +{ + int level; + + level = kbdlight_get_level(); + if (level < 0) + return 0; + + return level; +} + +static struct tpacpi_led_classdev tpacpi_led_kbdlight = { + .led_classdev = { + .name = "tpacpi::kbd_backlight", + .max_brightness = 2, + .brightness_set = &kbdlight_sysfs_set, + .brightness_get = &kbdlight_sysfs_get, + } +}; + +static int __init kbdlight_init(struct ibm_init_struct *iibm) +{ + int rc; + + vdbg_printk(TPACPI_DBG_INIT, "initializing kbdlight subdriver\n"); + + TPACPI_ACPIHANDLE_INIT(hkey); + INIT_WORK(&tpacpi_led_kbdlight.work, kbdlight_set_worker); + + if (!kbdlight_is_supported()) { + tp_features.kbdlight = 0; + vdbg_printk(TPACPI_DBG_INIT, "kbdlight is unsupported\n"); + return 1; + } + + tp_features.kbdlight = 1; + + rc = led_classdev_register(&tpacpi_pdev->dev, + &tpacpi_led_kbdlight.led_classdev); + if (rc < 0) { + tp_features.kbdlight = 0; + return rc; + } + + return 0; +} + +static void kbdlight_exit(void) +{ + if (tp_features.kbdlight) + led_classdev_unregister(&tpacpi_led_kbdlight.led_classdev); + flush_workqueue(tpacpi_wq); +} + +static int kbdlight_read(struct seq_file *m) +{ + int level; + + if (!tp_features.kbdlight) { + seq_printf(m, "status:\t\tnot supported\n"); + } else { + level = kbdlight_get_level(); + if (level < 0) + seq_printf(m, "status:\t\terror %d\n", level); + else + seq_printf(m, "status:\t\t%d\n", level); + seq_printf(m, "commands:\t0, 1, 2\n"); + } + + return 0; +} + +static int kbdlight_write(char *buf) +{ + char *cmd; + int level = -1; + + if (!tp_features.kbdlight) + return -ENODEV; + + while ((cmd = next_cmd(&buf))) { + if (strlencmp(cmd, "0") == 0) + level = 0; + else if (strlencmp(cmd, "1") == 0) + level = 1; + else if (strlencmp(cmd, "2") == 0) + level = 2; + else + return -EINVAL; + } + + if (level == -1) + return -EINVAL; + + return kbdlight_set_level(level); +} + +static struct ibm_struct kbdlight_driver_data = { + .name = "kbdlight", + .read = kbdlight_read, + .write = kbdlight_write, + .exit = kbdlight_exit, +}; + +/************************************************************************* * Light (thinklight) subdriver */ @@ -9207,6 +9408,10 @@ static struct ibm_init_struct ibms_init[] __initdata = { }, #endif { + .init = kbdlight_init, + .data = &kbdlight_driver_data, + }, + { .init = light_init, .data = &light_driver_data, },

thinkpad_acpi: Add support for keyboard backlight

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