From patchwork Tue Jul 27 14:04:59 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Geert Uytterhoeven X-Patchwork-Id: 12402901 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 31D78C19F41 for ; Tue, 27 Jul 2021 14:05:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 147FD61AD1 for ; Tue, 27 Jul 2021 14:05:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236997AbhG0OFV (ORCPT ); Tue, 27 Jul 2021 10:05:21 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42702 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236867AbhG0OFP (ORCPT ); Tue, 27 Jul 2021 10:05:15 -0400 Received: from baptiste.telenet-ops.be (baptiste.telenet-ops.be [IPv6:2a02:1800:120:4::f00:13]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 928F4C061254 for ; Tue, 27 Jul 2021 07:05:12 -0700 (PDT) Received: from ramsan.of.borg ([IPv6:2a02:1810:ac12:ed20:b0a9:7e88:5ca4:551a]) by baptiste.telenet-ops.be with bizsmtp id aE572500V1fSPfK01E575q; Tue, 27 Jul 2021 16:05:10 +0200 Received: from rox.of.borg ([192.168.97.57]) by ramsan.of.borg with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.93) (envelope-from ) id 1m8Nhi-001Pul-Vs; Tue, 27 Jul 2021 16:05:07 +0200 Received: from geert by rox.of.borg with local (Exim 4.93) (envelope-from ) id 1m8Nhi-00FoEC-0t; Tue, 27 Jul 2021 16:05:06 +0200 From: Geert Uytterhoeven To: Robin van der Gracht , Rob Herring , Miguel Ojeda , Paul Burton , Greg Kroah-Hartman , Pavel Machek , Marek Behun Cc: devicetree@vger.kernel.org, linux-leds@vger.kernel.org, linux-mips@vger.kernel.org, linux-kernel@vger.kernel.org, Geert Uytterhoeven Subject: [PATCH v4 19/19] auxdisplay: ht16k33: Add LED support Date: Tue, 27 Jul 2021 16:04:59 +0200 Message-Id: <20210727140459.3767788-20-geert@linux-m68k.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210727140459.3767788-1-geert@linux-m68k.org> References: <20210727140459.3767788-1-geert@linux-m68k.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-mips@vger.kernel.org Instantiate a single LED based on the "led" subnode in DT. This allows the user to control display brightness and blinking (backed by hardware support) through the LED class API and triggers, and exposes the display color. The LED will be named "auxdisplay::". When running in dot-matrix mode and if no "led" subnode is found, the driver falls back to the traditional backlight mode, to preserve backwards compatibility. Signed-off-by: Geert Uytterhoeven --- v4: - Add missing select LEDS_CLASS, v3: - Remove unneeded C++ comment, - Use "err" instead of "error" to be consistent with existing driver naming style, - Make the creation of the LED device dependent on the presence of the "led" subnode in DT, so it can be used in dot-matrix mode too. - Use led_init_data() and devm_led_classdev_register_ext() to retrieve all LED properties from DT, instead of manual LED name construction based on just the "color" property, v2: - Use "auxdisplay" instead of DRIVER_NAME in LED name. --- drivers/auxdisplay/Kconfig | 1 + drivers/auxdisplay/ht16k33.c | 124 ++++++++++++++++++++++++++++++----- 2 files changed, 108 insertions(+), 17 deletions(-) diff --git a/drivers/auxdisplay/Kconfig b/drivers/auxdisplay/Kconfig index 42fc7b155de09dbc..7436b9a4edbe5450 100644 --- a/drivers/auxdisplay/Kconfig +++ b/drivers/auxdisplay/Kconfig @@ -176,6 +176,7 @@ config HT16K33 select FB_SYS_IMAGEBLIT select INPUT_MATRIXKMAP select FB_BACKLIGHT + select LEDS_CLASS select LINEDISP help Say yes here to add support for Holtek HT16K33, RAM mapping 16*8 diff --git a/drivers/auxdisplay/ht16k33.c b/drivers/auxdisplay/ht16k33.c index 3b555e119e326cec..8c9a4a554a680ff2 100644 --- a/drivers/auxdisplay/ht16k33.c +++ b/drivers/auxdisplay/ht16k33.c @@ -18,6 +18,7 @@ #include #include #include +#include #include #include @@ -34,6 +35,10 @@ #define REG_DISPLAY_SETUP 0x80 #define REG_DISPLAY_SETUP_ON BIT(0) +#define REG_DISPLAY_SETUP_BLINK_OFF (0 << 1) +#define REG_DISPLAY_SETUP_BLINK_2HZ (1 << 1) +#define REG_DISPLAY_SETUP_BLINK_1HZ (2 << 1) +#define REG_DISPLAY_SETUP_BLINK_0HZ5 (3 << 1) #define REG_ROWINT_SET 0xA0 #define REG_ROWINT_SET_INT_EN BIT(0) @@ -94,12 +99,14 @@ struct ht16k33_seg { struct ht16k33_priv { struct i2c_client *client; struct delayed_work work; + struct led_classdev led; struct ht16k33_keypad keypad; union { struct ht16k33_fbdev fbdev; struct ht16k33_seg seg; }; enum display_type type; + uint8_t blink; }; static const struct fb_fix_screeninfo ht16k33_fb_fix = { @@ -158,7 +165,7 @@ static DEVICE_ATTR(map_seg14, 0644, map_seg_show, map_seg_store); static int ht16k33_display_on(struct ht16k33_priv *priv) { - uint8_t data = REG_DISPLAY_SETUP | REG_DISPLAY_SETUP_ON; + uint8_t data = REG_DISPLAY_SETUP | REG_DISPLAY_SETUP_ON | priv->blink; return i2c_smbus_write_byte(priv->client, data); } @@ -173,8 +180,10 @@ static int ht16k33_brightness_set(struct ht16k33_priv *priv, { int err; - if (brightness == 0) + if (brightness == 0) { + priv->blink = REG_DISPLAY_SETUP_BLINK_OFF; return ht16k33_display_off(priv); + } err = ht16k33_display_on(priv); if (err) @@ -184,6 +193,49 @@ static int ht16k33_brightness_set(struct ht16k33_priv *priv, REG_BRIGHTNESS | (brightness - 1)); } +static int ht16k33_brightness_set_blocking(struct led_classdev *led_cdev, + enum led_brightness brightness) +{ + struct ht16k33_priv *priv = container_of(led_cdev, struct ht16k33_priv, + led); + + return ht16k33_brightness_set(priv, brightness); +} + +static int ht16k33_blink_set(struct led_classdev *led_cdev, + unsigned long *delay_on, unsigned long *delay_off) +{ + struct ht16k33_priv *priv = container_of(led_cdev, struct ht16k33_priv, + led); + unsigned int delay; + uint8_t blink; + int err; + + if (!*delay_on && !*delay_off) { + blink = REG_DISPLAY_SETUP_BLINK_1HZ; + delay = 1000; + } else if (*delay_on <= 750) { + blink = REG_DISPLAY_SETUP_BLINK_2HZ; + delay = 500; + } else if (*delay_on <= 1500) { + blink = REG_DISPLAY_SETUP_BLINK_1HZ; + delay = 1000; + } else { + blink = REG_DISPLAY_SETUP_BLINK_0HZ5; + delay = 2000; + } + + err = i2c_smbus_write_byte(priv->client, + REG_DISPLAY_SETUP | REG_DISPLAY_SETUP_ON | + blink); + if (err) + return err; + + priv->blink = blink; + *delay_on = *delay_off = delay; + return 0; +} + static void ht16k33_fb_queue(struct ht16k33_priv *priv) { struct ht16k33_fbdev *fbdev = &priv->fbdev; @@ -425,6 +477,35 @@ static void ht16k33_seg14_update(struct work_struct *work) i2c_smbus_write_i2c_block_data(priv->client, 0, ARRAY_SIZE(buf), buf); } +static int ht16k33_led_probe(struct device *dev, struct led_classdev *led, + unsigned int brightness) +{ + struct led_init_data init_data = {}; + struct device_node *node; + int err; + + /* The LED is optional */ + node = of_get_child_by_name(dev->of_node, "led"); + if (!node) + return 0; + + led->brightness_set_blocking = ht16k33_brightness_set_blocking; + led->blink_set = ht16k33_blink_set; + led->flags = LED_CORE_SUSPENDRESUME; + led->brightness = brightness; + led->max_brightness = MAX_BRIGHTNESS; + + init_data.fwnode = of_fwnode_handle(node); + init_data.devicename = "auxdisplay"; + init_data.devname_mandatory = true; + + err = devm_led_classdev_register_ext(dev, led, &init_data); + if (err) + dev_err(dev, "Failed to register LED\n"); + + return err; +} + static int ht16k33_keypad_probe(struct i2c_client *client, struct ht16k33_keypad *keypad) { @@ -498,24 +579,28 @@ static int ht16k33_fbdev_probe(struct device *dev, struct ht16k33_priv *priv, uint32_t brightness) { struct ht16k33_fbdev *fbdev = &priv->fbdev; - struct backlight_properties bl_props; - struct backlight_device *bl; + struct backlight_device *bl = NULL; int err; - /* Backlight */ - memset(&bl_props, 0, sizeof(struct backlight_properties)); - bl_props.type = BACKLIGHT_RAW; - bl_props.max_brightness = MAX_BRIGHTNESS; + if (!priv->led.dev) { + /* backwards compatibility with DT lacking an led subnode */ + struct backlight_properties bl_props; - bl = devm_backlight_device_register(dev, DRIVER_NAME"-bl", dev, priv, - &ht16k33_bl_ops, &bl_props); - if (IS_ERR(bl)) { - dev_err(dev, "failed to register backlight\n"); - return PTR_ERR(bl); - } + memset(&bl_props, 0, sizeof(struct backlight_properties)); + bl_props.type = BACKLIGHT_RAW; + bl_props.max_brightness = MAX_BRIGHTNESS; + + bl = devm_backlight_device_register(dev, DRIVER_NAME"-bl", dev, + priv, &ht16k33_bl_ops, + &bl_props); + if (IS_ERR(bl)) { + dev_err(dev, "failed to register backlight\n"); + return PTR_ERR(bl); + } - bl->props.brightness = brightness; - ht16k33_bl_update_status(bl); + bl->props.brightness = brightness; + ht16k33_bl_update_status(bl); + } /* Framebuffer (2 bytes per column) */ BUILD_BUG_ON(PAGE_SIZE < HT16K33_FB_SIZE); @@ -575,7 +660,7 @@ static int ht16k33_seg_probe(struct device *dev, struct ht16k33_priv *priv, struct ht16k33_seg *seg = &priv->seg; int err; - err = ht16k33_brightness_set(priv, MAX_BRIGHTNESS); + err = ht16k33_brightness_set(priv, brightness); if (err) return err; @@ -653,6 +738,11 @@ static int ht16k33_probe(struct i2c_client *client) dft_brightness = MAX_BRIGHTNESS; } + /* LED */ + err = ht16k33_led_probe(dev, &priv->led, dft_brightness); + if (err) + return err; + /* Keypad */ if (client->irq > 0) { err = ht16k33_keypad_probe(client, &priv->keypad);