From patchwork Mon Jun 27 08:38:33 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jean-Jacques Hiblot X-Patchwork-Id: 585359 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 48B6BC43334 for ; Mon, 27 Jun 2022 08:38:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232730AbiF0Iir (ORCPT ); Mon, 27 Jun 2022 04:38:47 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35848 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231721AbiF0Iiq (ORCPT ); Mon, 27 Jun 2022 04:38:46 -0400 Received: from smtpout1.mo3004.mail-out.ovh.net (smtpout1.mo3004.mail-out.ovh.net [79.137.123.219]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id EB77460FF; Mon, 27 Jun 2022 01:38:44 -0700 (PDT) Received: from pro2.mail.ovh.net (unknown [10.108.16.183]) by mo3004.mail-out.ovh.net (Postfix) with ESMTPS id A955D243C93; Mon, 27 Jun 2022 08:38:43 +0000 (UTC) Received: from localhost.localdomain (88.161.25.233) by DAG1EX2.emp2.local (172.16.2.2) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.9; Mon, 27 Jun 2022 10:38:43 +0200 From: Jean-Jacques Hiblot To: , , , CC: , , , Jean-Jacques Hiblot Subject: [PATCH v6 1/3] dt-bindings: leds: Add bindings for the TLC5925 controller Date: Mon, 27 Jun 2022 10:38:33 +0200 Message-ID: <20220627083835.106676-2-jjhiblot@traphandler.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220627083835.106676-1-jjhiblot@traphandler.com> References: <20220627083835.106676-1-jjhiblot@traphandler.com> MIME-Version: 1.0 X-Originating-IP: [88.161.25.233] X-ClientProxiedBy: CAS1.emp2.local (172.16.1.1) To DAG1EX2.emp2.local (172.16.2.2) X-Ovh-Tracer-Id: 7823596980943862235 X-VR-SPAMSTATE: OK X-VR-SPAMSCORE: 0 X-VR-SPAMCAUSE: gggruggvucftvghtrhhoucdtuddrgedvfedrudeghedgtdeiucetufdoteggodetrfdotffvucfrrhhofhhilhgvmecuqfggjfdpvefjgfevmfevgfenuceurghilhhouhhtmecuhedttdenucenucfjughrpefhvfevufffkffojghfggfgtghisehtkeertdertddtnecuhfhrohhmpeflvggrnhdqlfgrtghquhgvshcujfhisghlohhtuceojhhjhhhisghlohhtsehtrhgrphhhrghnughlvghrrdgtohhmqeenucggtffrrghtthgvrhhnpedttdffveeljeetleeijefhffevtdffleejheejiefgjeeludefvdevjedutdejhfenucffohhmrghinhepuggvvhhitggvthhrvggvrdhorhhgnecukfhppedtrddtrddtrddtpdekkedrudeiuddrvdehrddvfeefnecuvehluhhsthgvrhfuihiivgeptdenucfrrghrrghmpehmohguvgepshhmthhpohhuthdphhgvlhhopehprhhovddrmhgrihhlrdhovhhhrdhnvghtpdhinhgvtheptddrtddrtddrtddpmhgrihhlfhhrohhmpehjjhhhihgslhhothesthhrrghphhgrnhgulhgvrhdrtghomhdpnhgspghrtghpthhtohepuddprhgtphhtthhopehlihhnuhigqdhkvghrnhgvlhesvhhgvghrrdhkvghrnhgvlhdrohhrghdpoffvtefjohhsthepmhhofedttdeg Precedence: bulk List-ID: X-Mailing-List: linux-leds@vger.kernel.org Add bindings documentation for the TLC5925 LED controller. Signed-off-by: Jean-Jacques Hiblot Reviewed-by: Andy Shevchenko Reviewed-by: Rob Herring --- .../devicetree/bindings/leds/ti,tlc5925.yaml | 105 ++++++++++++++++++ 1 file changed, 105 insertions(+) create mode 100644 Documentation/devicetree/bindings/leds/ti,tlc5925.yaml diff --git a/Documentation/devicetree/bindings/leds/ti,tlc5925.yaml b/Documentation/devicetree/bindings/leds/ti,tlc5925.yaml new file mode 100644 index 000000000000..ce376917b423 --- /dev/null +++ b/Documentation/devicetree/bindings/leds/ti,tlc5925.yaml @@ -0,0 +1,105 @@ +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/leds/ti,tlc5925.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: LEDs connected to TI TLC5925 controller + +maintainers: + - Jean-Jacques Hiblot + +description: | + The TLC5925 is a low-power 16-channel constant-current LED sink driver. + It is controlled through a SPI interface. + It is built around a shift register and latches which convert serial + input data into a parallel output. Several TLC5925 can be chained to + control more than 16 LEDs with a single chip-select. + The brightness level cannot be controlled, each LED is either on or off. + + Each LED is represented as a sub-node of the ti,tlc5925 device. + +$ref: /schemas/spi/spi-peripheral-props.yaml# + +properties: + compatible: + const: ti,tlc5925 + + ti,shift-register-length: + $ref: /schemas/types.yaml#/definitions/uint32 + minimum: 8 + multipleOf: 8 + description: + The length of the shift register. If several TLC5925 are chained, + shift_register_length should be set to 16 times the number of TLC5925. + The value must be a multiple of 8. + + "#address-cells": + const: 1 + + "#size-cells": + const: 0 + + output-enable-b-gpios: + description: + Optional GPIO pins to enable/disable the parallel output. They describe + the GPIOs connected to the OE/ pin of the TLC5925s. + +patternProperties: + "@[0-9a-f]+$": + type: object + $ref: common.yaml# + unevaluatedProperties: false + properties: + reg: + description: + LED pin number (must be lower than ti,shift-register-length). + The furthest LED down the chain has the pin number 0. + + required: + - reg + +required: + - "#address-cells" + - "#size-cells" + +unevaluatedProperties: false + +examples: + - | + #include + #include + + spi { + #address-cells = <1>; + #size-cells = <0>; + + leds@2 { + compatible = "ti,tlc5925"; + reg = <0x02>; + spi-max-frequency = <30000000>; + ti,shift-register-length = <32>; + output-enable-b-gpios = <&gpio0b 9 GPIO_ACTIVE_HIGH>, <&gpio0b 7 GPIO_ACTIVE_HIGH>; + #address-cells = <1>; + #size-cells = <0>; + + led@0 { + reg = <0>; + function = LED_FUNCTION_STATUS; + color = ; + }; + + led@4 { + reg = <4>; + function = LED_FUNCTION_STATUS; + color = ; + }; + + led@1f { + reg = <31>; + function = LED_FUNCTION_PANIC; + color = ; + }; + }; + + }; From patchwork Mon Jun 27 08:38:34 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jean-Jacques Hiblot X-Patchwork-Id: 585358 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 507DCC43334 for ; Mon, 27 Jun 2022 08:38:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233419AbiF0Iis (ORCPT ); Mon, 27 Jun 2022 04:38:48 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35854 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232105AbiF0Iir (ORCPT ); Mon, 27 Jun 2022 04:38:47 -0400 Received: from smtpout1.mo3004.mail-out.ovh.net (smtpout1.mo3004.mail-out.ovh.net [79.137.123.219]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 568986152; Mon, 27 Jun 2022 01:38:45 -0700 (PDT) Received: from pro2.mail.ovh.net (unknown [10.108.20.52]) by mo3004.mail-out.ovh.net (Postfix) with ESMTPS id EB4F7243B1B; Mon, 27 Jun 2022 08:38:43 +0000 (UTC) Received: from localhost.localdomain (88.161.25.233) by DAG1EX2.emp2.local (172.16.2.2) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.9; Mon, 27 Jun 2022 10:38:43 +0200 From: Jean-Jacques Hiblot To: , , , CC: , , , Jean-Jacques Hiblot Subject: [PATCH v6 2/3] leds: Add driver for the TLC5925 LED controller Date: Mon, 27 Jun 2022 10:38:34 +0200 Message-ID: <20220627083835.106676-3-jjhiblot@traphandler.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220627083835.106676-1-jjhiblot@traphandler.com> References: <20220627083835.106676-1-jjhiblot@traphandler.com> MIME-Version: 1.0 X-Originating-IP: [88.161.25.233] X-ClientProxiedBy: CAS1.emp2.local (172.16.1.1) To DAG1EX2.emp2.local (172.16.2.2) X-Ovh-Tracer-Id: 7823878453190736347 X-VR-SPAMSTATE: OK X-VR-SPAMSCORE: 0 X-VR-SPAMCAUSE: gggruggvucftvghtrhhoucdtuddrgedvfedrudeghedgtdeiucetufdoteggodetrfdotffvucfrrhhofhhilhgvmecuqfggjfdpvefjgfevmfevgfenuceurghilhhouhhtmecuhedttdenucenucfjughrpefhvfevufffkffojghfggfgtghisehtkeertdertddtnecuhfhrohhmpeflvggrnhdqlfgrtghquhgvshcujfhisghlohhtuceojhhjhhhisghlohhtsehtrhgrphhhrghnughlvghrrdgtohhmqeenucggtffrrghtthgvrhhnpeejveevffefudeutddukeekueeifeeuhfetfefgfedulefhhffgvddvvdevieekveenucffohhmrghinhepthhirdgtohhmnecukfhppedtrddtrddtrddtpdekkedrudeiuddrvdehrddvfeefnecuvehluhhsthgvrhfuihiivgeptdenucfrrghrrghmpehmohguvgepshhmthhpohhuthdphhgvlhhopehprhhovddrmhgrihhlrdhovhhhrdhnvghtpdhinhgvtheptddrtddrtddrtddpmhgrihhlfhhrohhmpehjjhhhihgslhhothesthhrrghphhgrnhgulhgvrhdrtghomhdpnhgspghrtghpthhtohepuddprhgtphhtthhopehlihhnuhigqdhkvghrnhgvlhesvhhgvghrrdhkvghrnhgvlhdrohhrghdpoffvtefjohhsthepmhhofedttdeg Precedence: bulk List-ID: X-Mailing-List: linux-leds@vger.kernel.org The TLC5925 is a 16-channels constant-current LED sink driver. It is controlled via SPI but doesn't offer a register-based interface. Instead it contains a shift register and latches that convert the serial input into a parallel output. Datasheet: https://www.ti.com/lit/ds/symlink/tlc5925.pdf Signed-off-by: Jean-Jacques Hiblot Reviewed-by: Andy Shevchenko --- drivers/leds/Kconfig | 6 ++ drivers/leds/Makefile | 1 + drivers/leds/leds-tlc5925.c | 148 ++++++++++++++++++++++++++++++++++++ 3 files changed, 155 insertions(+) create mode 100644 drivers/leds/leds-tlc5925.c diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig index a49979f41eee..b17eb01210ba 100644 --- a/drivers/leds/Kconfig +++ b/drivers/leds/Kconfig @@ -658,6 +658,12 @@ config LEDS_TLC591XX This option enables support for Texas Instruments TLC59108 and TLC59116 LED controllers. +config LEDS_TLC5925 + tristate "LED driver for TLC5925 controller" + depends on LEDS_CLASS && SPI + help + This option enables support for Texas Instruments TLC5925. + config LEDS_MAX77650 tristate "LED support for Maxim MAX77650 PMIC" depends on LEDS_CLASS && MFD_MAX77650 diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile index 4fd2f92cd198..9d15b88d482f 100644 --- a/drivers/leds/Makefile +++ b/drivers/leds/Makefile @@ -81,6 +81,7 @@ obj-$(CONFIG_LEDS_SYSCON) += leds-syscon.o obj-$(CONFIG_LEDS_TCA6507) += leds-tca6507.o obj-$(CONFIG_LEDS_TI_LMU_COMMON) += leds-ti-lmu-common.o obj-$(CONFIG_LEDS_TLC591XX) += leds-tlc591xx.o +obj-$(CONFIG_LEDS_TLC5925) += leds-tlc5925.o obj-$(CONFIG_LEDS_TPS6105X) += leds-tps6105x.o obj-$(CONFIG_LEDS_TURRIS_OMNIA) += leds-turris-omnia.o obj-$(CONFIG_LEDS_WM831X_STATUS) += leds-wm831x-status.o diff --git a/drivers/leds/leds-tlc5925.c b/drivers/leds/leds-tlc5925.c new file mode 100644 index 000000000000..797836354c74 --- /dev/null +++ b/drivers/leds/leds-tlc5925.c @@ -0,0 +1,148 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * The driver supports controllers with a very simple SPI protocol: + * - the data is deserialized in a shift-register when CS is asserted + * - the data is latched when CS is de-asserted + * - the LED are either on or off (no control of the brightness) + * + * Supported devices: + * - "ti,tlc5925": Low-Power 16-Channel Constant-Current LED Sink Driver + * https://www.ti.com/lit/ds/symlink/tlc5925.pdf + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +#define TLC5925_SHIFT_REGISTER_LENGTH 16 + +struct single_led_priv { + struct led_classdev cdev; + int idx; +}; + +struct tlc5925_leds_priv { + int max_num_leds; + unsigned long *state; + struct single_led_priv leds[]; +}; + +static int tlc5925_brightness_set_blocking(struct led_classdev *cdev, + enum led_brightness brightness) +{ + struct spi_device *spi = to_spi_device(cdev->dev->parent); + struct tlc5925_leds_priv *priv = spi_get_drvdata(spi); + struct single_led_priv *led = + container_of(cdev, struct single_led_priv, cdev); + int index = led->idx; + + assign_bit(index, priv->state, !!brightness); + + return spi_write(spi, priv->state, BITS_TO_BYTES(priv->max_num_leds)); +} + +static int tlc5925_probe(struct spi_device *spi) +{ + struct device *dev = &spi->dev; + struct fwnode_handle *child; + struct tlc5925_leds_priv *priv; + int count; + int max_num_leds = TLC5925_SHIFT_REGISTER_LENGTH; + struct gpio_descs *gpios; + + /* Assert all the OE/ lines */ + gpios = devm_gpiod_get_array(dev, "output-enable-b", GPIOD_OUT_LOW); + if (IS_ERR(gpios)) + return dev_err_probe(dev, PTR_ERR(gpios), + "Unable to get the 'output-enable-b' gpios\n"); + + count = device_get_child_node_count(dev); + if (!count) + return dev_err_probe(dev, -ENODEV, "no led defined.\n"); + + device_property_read_u32(dev, "ti,shift-register-length", + &max_num_leds); + + if (max_num_leds % 8) + return dev_err_probe(dev, -EINVAL, + "'ti,shift-register-length' must be a multiple of 8\n"); + if (max_num_leds == 0) + return dev_err_probe(dev, -EINVAL, + "'ti,shift-register-length' must be greater than 0\n"); + + priv = devm_kzalloc(dev, struct_size(priv, leds, count), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + priv->state = devm_bitmap_zalloc(dev, max_num_leds, GFP_KERNEL); + if (!priv->state) + return -ENOMEM; + + priv->max_num_leds = max_num_leds; + + device_for_each_child_node(dev, child) { + struct led_init_data init_data = { .fwnode = child }; + struct led_classdev *cdev; + u32 idx; + int ret; + + ret = fwnode_property_read_u32(child, "reg", &idx); + if (ret || idx >= max_num_leds) { + dev_warn(dev, "%pfwP: invalid reg value. Ignoring.\n", + child); + fwnode_handle_put(child); + continue; + } + + count--; + priv->leds[count].idx = idx; + cdev = &(priv->leds[count].cdev); + cdev->brightness = LED_OFF; + cdev->max_brightness = 1; + cdev->brightness_set_blocking = tlc5925_brightness_set_blocking; + + ret = devm_led_classdev_register_ext(dev, cdev, &init_data); + if (ret) { + dev_warn(dev, "%pfwP: cannot create LED device.\n", + child); + fwnode_handle_put(child); + continue; + } + } + + spi_set_drvdata(spi, priv); + + return 0; +} + +static const struct of_device_id tlc5925_dt_ids[] = { + { .compatible = "ti,tlc5925", }, + {} +}; +MODULE_DEVICE_TABLE(of, tlc5925_dt_ids); + +static const struct spi_device_id tlc5925_id[] = { + {"tlc5925", 0}, + {} +}; +MODULE_DEVICE_TABLE(spi, tlc5925_id); + +static struct spi_driver tlc5925_driver = { + .driver = { + .name = KBUILD_MODNAME, + .of_match_table = tlc5925_dt_ids, + }, + .id_table = tlc5925_id, + .probe = tlc5925_probe, +}; +module_spi_driver(tlc5925_driver); + +MODULE_AUTHOR("Jean-Jacques Hiblot "); +MODULE_DESCRIPTION("TLC5925 LED driver"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("spi:tlc5925"); From patchwork Mon Jun 27 08:38:35 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jean-Jacques Hiblot X-Patchwork-Id: 586215 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 57E8FCCA482 for ; Mon, 27 Jun 2022 08:38:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231721AbiF0Iiu (ORCPT ); Mon, 27 Jun 2022 04:38:50 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35866 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233451AbiF0Iis (ORCPT ); Mon, 27 Jun 2022 04:38:48 -0400 Received: from smtpout1.mo528.mail-out.ovh.net (smtpout1.mo528.mail-out.ovh.net [46.105.34.251]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 770FD60FF; Mon, 27 Jun 2022 01:38:47 -0700 (PDT) Received: from pro2.mail.ovh.net (unknown [10.108.4.248]) by mo528.mail-out.ovh.net (Postfix) with ESMTPS id 5063B1128E079; Mon, 27 Jun 2022 10:38:44 +0200 (CEST) Received: from localhost.localdomain (88.161.25.233) by DAG1EX2.emp2.local (172.16.2.2) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.9; Mon, 27 Jun 2022 10:38:43 +0200 From: Jean-Jacques Hiblot To: , , , CC: , , , Jean-Jacques Hiblot Subject: [PATCH v6 3/3] leds: tlc5925: Add support for non blocking operations Date: Mon, 27 Jun 2022 10:38:35 +0200 Message-ID: <20220627083835.106676-4-jjhiblot@traphandler.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220627083835.106676-1-jjhiblot@traphandler.com> References: <20220627083835.106676-1-jjhiblot@traphandler.com> MIME-Version: 1.0 X-Originating-IP: [88.161.25.233] X-ClientProxiedBy: CAS1.emp2.local (172.16.1.1) To DAG1EX2.emp2.local (172.16.2.2) X-Ovh-Tracer-Id: 7824159928964626907 X-VR-SPAMSTATE: OK X-VR-SPAMSCORE: 0 X-VR-SPAMCAUSE: gggruggvucftvghtrhhoucdtuddrgedvfedrudeghedgtdeiucetufdoteggodetrfdotffvucfrrhhofhhilhgvmecuqfggjfdpvefjgfevmfevgfenuceurghilhhouhhtmecuhedttdenucenucfjughrpefhvfevufffkffojghfggfgtghisehtkeertdertddtnecuhfhrohhmpeflvggrnhdqlfgrtghquhgvshcujfhisghlohhtuceojhhjhhhisghlohhtsehtrhgrphhhrghnughlvghrrdgtohhmqeenucggtffrrghtthgvrhhnpeduteevleevvefggfdvueffffejhfehheeuiedtgedtjeeghfehueduudegfeefueenucfkpheptddrtddrtddrtddpkeekrdduiedurddvhedrvdeffeenucevlhhushhtvghrufhiiigvpedtnecurfgrrhgrmhepmhhouggvpehsmhhtphhouhhtpdhhvghlohepphhrohdvrdhmrghilhdrohhvhhdrnhgvthdpihhnvghtpedtrddtrddtrddtpdhmrghilhhfrhhomhepjhhjhhhisghlohhtsehtrhgrphhhrghnughlvghrrdgtohhmpdhnsggprhgtphhtthhopedupdhrtghpthhtoheplhhinhhugidqkhgvrhhnvghlsehvghgvrhdrkhgvrhhnvghlrdhorhhgpdfovfetjfhoshhtpehmohehvdek Precedence: bulk List-ID: X-Mailing-List: linux-leds@vger.kernel.org Settings multiple LEDs in a row can be a slow operation because of the time required to acquire the bus and prepare the transfer. And, in most cases, it is not required that the operation is synchronous. Implementing the non-blocking brightness_set() for such cases. A work queue is used to perform the actual SPI transfer. The blocking method is still available in case someone needs to perform this operation synchronously (ie by calling led_set_brightness_sync()). Signed-off-by: Jean-Jacques Hiblot Reviewed-by: Andy Shevchenko --- drivers/leds/leds-tlc5925.c | 38 +++++++++++++++++++++++++++++++++++-- 1 file changed, 36 insertions(+), 2 deletions(-) diff --git a/drivers/leds/leds-tlc5925.c b/drivers/leds/leds-tlc5925.c index 797836354c74..0423e3592bd7 100644 --- a/drivers/leds/leds-tlc5925.c +++ b/drivers/leds/leds-tlc5925.c @@ -18,6 +18,7 @@ #include #include #include +#include #define TLC5925_SHIFT_REGISTER_LENGTH 16 @@ -29,10 +30,25 @@ struct single_led_priv { struct tlc5925_leds_priv { int max_num_leds; unsigned long *state; + struct spi_device *spi; + struct work_struct xmit_work; struct single_led_priv leds[]; }; -static int tlc5925_brightness_set_blocking(struct led_classdev *cdev, +static int xmit(struct tlc5925_leds_priv *priv) +{ + return spi_write(priv->spi, priv->state, BITS_TO_BYTES(priv->max_num_leds)); +} + +static void xmit_work(struct work_struct *ws) +{ + struct tlc5925_leds_priv *priv = + container_of(ws, struct tlc5925_leds_priv, xmit_work); + + xmit(priv); +}; + +static void tlc5925_brightness_set(struct led_classdev *cdev, enum led_brightness brightness) { struct spi_device *spi = to_spi_device(cdev->dev->parent); @@ -43,9 +59,23 @@ static int tlc5925_brightness_set_blocking(struct led_classdev *cdev, assign_bit(index, priv->state, !!brightness); - return spi_write(spi, priv->state, BITS_TO_BYTES(priv->max_num_leds)); + schedule_work(&priv->xmit_work); } +static int tlc5925_brightness_set_blocking(struct led_classdev *cdev, + enum led_brightness brightness) +{ + struct spi_device *spi = to_spi_device(cdev->dev->parent); + struct tlc5925_leds_priv *priv = spi_get_drvdata(spi); + struct single_led_priv *led = + container_of(cdev, struct single_led_priv, cdev); + int index = led->idx; + + assign_bit(index, priv->state, !!brightness); + + cancel_work_sync(&priv->xmit_work); + return xmit(priv); +} static int tlc5925_probe(struct spi_device *spi) { struct device *dev = &spi->dev; @@ -83,6 +113,9 @@ static int tlc5925_probe(struct spi_device *spi) if (!priv->state) return -ENOMEM; + priv->spi = spi; + INIT_WORK(&priv->xmit_work, xmit_work); + priv->max_num_leds = max_num_leds; device_for_each_child_node(dev, child) { @@ -104,6 +137,7 @@ static int tlc5925_probe(struct spi_device *spi) cdev = &(priv->leds[count].cdev); cdev->brightness = LED_OFF; cdev->max_brightness = 1; + cdev->brightness_set = tlc5925_brightness_set; cdev->brightness_set_blocking = tlc5925_brightness_set_blocking; ret = devm_led_classdev_register_ext(dev, cdev, &init_data);