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[2620:137:e000::1:20]) by mx.google.com with ESMTP id lw13-20020a17090b180d00b00232f57260c1si2829779pjb.1.2023.05.17.12.57.22; Wed, 17 May 2023 12:57:36 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@sberdevices.ru header.s=mail header.b=a74y8ElY; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=QUARANTINE sp=QUARANTINE dis=NONE) header.from=sberdevices.ru Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229903AbjEQTxB (ORCPT + 99 others); Wed, 17 May 2023 15:53:01 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37414 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229814AbjEQTxA (ORCPT ); Wed, 17 May 2023 15:53:00 -0400 Received: from mx.sberdevices.ru (mx.sberdevices.ru [45.89.227.171]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D936555A9; Wed, 17 May 2023 12:52:56 -0700 (PDT) Received: from s-lin-edge02.sberdevices.ru (localhost [127.0.0.1]) by mx.sberdevices.ru (Postfix) with ESMTP id 481E25FD48; Wed, 17 May 2023 22:52:54 +0300 (MSK) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sberdevices.ru; s=mail; t=1684353174; bh=I7/4CVIoC9+TGp8GwFUh+0busZ3FOuWXAFKMy9pjxXo=; h=From:To:Subject:Date:Message-ID:MIME-Version:Content-Type; b=a74y8ElYgByCpWEN5XnrNJrJR78ThBkVOn/Mrb3VHkTaruxDpYgXXfHlmJK4Unt9l R52fGfEZWU/AOV6TaJ17sp8VGqOfzGJaZBkAfL75zEubAgEehJLdj8QvAsREuVoJ6R 2ZWE3XrIQbJgwhpTKOxKds/0oLriJCilkz5CeF0WAXFm1gfmqIjt/HudvDm4g76oG3 58aj49wzWQXcnU9pcLzdqQjqvozz/zqaehITqHfcyuQnEYP+yl01945SG7x+iO1Vl1 cBsE0jiFwAJoV9SJRYvfoSIqPLV2Ztp1UglY3EVtSLHPXXWP6vWKl3kdqfb5NsC/NM i1sx/oZwIodSQ== Received: from S-MS-EXCH01.sberdevices.ru (S-MS-EXCH01.sberdevices.ru [172.16.1.4]) by mx.sberdevices.ru (Postfix) with ESMTP; Wed, 17 May 2023 22:52:54 +0300 (MSK) From: Martin Kurbanov To: Pavel Machek , Lee Jones , Rob Herring , Krzysztof Kozlowski , Andy Shevchenko CC: , , , , Martin Kurbanov , Krzysztof Kozlowski Subject: [PATCH v4 1/2] dt-bindings: leds: add binding for aw200xx Date: Wed, 17 May 2023 22:52:37 +0300 Message-ID: <20230517195238.34069-2-mmkurbanov@sberdevices.ru> X-Mailer: git-send-email 2.40.0 In-Reply-To: <20230517195238.34069-1-mmkurbanov@sberdevices.ru> References: <20230517195238.34069-1-mmkurbanov@sberdevices.ru> MIME-Version: 1.0 X-Originating-IP: [172.16.1.6] X-ClientProxiedBy: S-MS-EXCH01.sberdevices.ru (172.16.1.4) To S-MS-EXCH01.sberdevices.ru (172.16.1.4) X-KSMG-Rule-ID: 4 X-KSMG-Message-Action: clean X-KSMG-AntiSpam-Status: not scanned, disabled by settings X-KSMG-AntiSpam-Interceptor-Info: not scanned X-KSMG-AntiPhishing: not scanned, disabled by settings X-KSMG-AntiVirus: Kaspersky Secure Mail Gateway, version 1.1.2.30, bases: 2023/05/17 11:04:00 #21328336 X-KSMG-AntiVirus-Status: Clean, skipped X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,SPF_HELO_NONE,SPF_NONE, T_SCC_BODY_TEXT_LINE,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1766172610567843412?= X-GMAIL-MSGID: =?utf-8?q?1766172610567843412?= Add YAML devicetree binding for AWINIC AW20036/AW20052/AW20074 led driver. Signed-off-by: Martin Kurbanov Reviewed-by: Krzysztof Kozlowski --- .../bindings/leds/awinic,aw200xx.yaml | 126 ++++++++++++++++++ 1 file changed, 126 insertions(+) create mode 100644 Documentation/devicetree/bindings/leds/awinic,aw200xx.yaml diff --git a/Documentation/devicetree/bindings/leds/awinic,aw200xx.yaml b/Documentation/devicetree/bindings/leds/awinic,aw200xx.yaml new file mode 100644 index 000000000000..feb5febaf361 --- /dev/null +++ b/Documentation/devicetree/bindings/leds/awinic,aw200xx.yaml @@ -0,0 +1,126 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/leds/awinic,aw200xx.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: AWINIC AW200XX LED + +maintainers: + - Martin Kurbanov + +description: | + This controller is present on AW20036/AW20054/AW20072. + It is a 3x12/6x9/6x12 matrix LED programmed via + an I2C interface, up to 36/54/72 LEDs or 12/18/24 RGBs, + 3 pattern controllers for auto breathing or group dimming control. + + For more product information please see the link below: + aw20036 - https://www.awinic.com/en/productDetail/AW20036QNR#tech-docs + aw20054 - https://www.awinic.com/en/productDetail/AW20054QNR#tech-docs + aw20072 - https://www.awinic.com/en/productDetail/AW20072QNR#tech-docs + +properties: + compatible: + enum: + - awinic,aw20036 + - awinic,aw20054 + - awinic,aw20072 + + reg: + maxItems: 1 + + "#address-cells": + const: 1 + + "#size-cells": + const: 0 + + awinic,display-rows: + $ref: /schemas/types.yaml#/definitions/uint32 + description: + Leds matrix size + +patternProperties: + "^led@[0-9a-f]$": + type: object + $ref: common.yaml# + unevaluatedProperties: false + + properties: + reg: + description: + LED number + maxItems: 1 + + led-max-microamp: + default: 9780 + description: | + Note that a driver will take the minimum of all LED limits + since the chip has a single global setting. + The maximum output current of each LED is calculated by the + following formula: + IMAXled = 160000 * (592 / 600.5) * (1 / display-rows) + And the minimum output current formula: + IMINled = 3300 * (592 / 600.5) * (1 / display-rows) + +required: + - compatible + - reg + - "#address-cells" + - "#size-cells" + - awinic,display-rows + +allOf: + - if: + properties: + compatible: + contains: + const: awinic,aw20036 + then: + properties: + awinic,display-rows: + enum: [1, 2, 3] + else: + properties: + awinic,display-rows: + enum: [1, 2, 3, 4, 5, 6, 7] + +additionalProperties: false + +examples: + - | + #include + + i2c { + #address-cells = <1>; + #size-cells = <0>; + + led-controller@3a { + compatible = "awinic,aw20036"; + reg = <0x3a>; + #address-cells = <1>; + #size-cells = <0>; + awinic,display-rows = <3>; + + led@0 { + reg = <0x0>; + color = ; + led-max-microamp = <9780>; + }; + + led@1 { + reg = <0x1>; + color = ; + led-max-microamp = <9780>; + }; + + led@2 { + reg = <0x2>; + color = ; + led-max-microamp = <9780>; + }; + }; + }; + +... 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[2620:137:e000::1:20]) by mx.google.com with ESMTP id m129-20020a633f87000000b0051b5c9dd1ffsi17783149pga.66.2023.05.17.12.57.48; Wed, 17 May 2023 12:58:01 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@sberdevices.ru header.s=mail header.b=HHrWkoMD; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=QUARANTINE sp=QUARANTINE dis=NONE) header.from=sberdevices.ru Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230011AbjEQTxG (ORCPT + 99 others); Wed, 17 May 2023 15:53:06 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37424 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229921AbjEQTxA (ORCPT ); Wed, 17 May 2023 15:53:00 -0400 Received: from mx.sberdevices.ru (mx.sberdevices.ru [45.89.227.171]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E79935BA5; Wed, 17 May 2023 12:52:56 -0700 (PDT) Received: from s-lin-edge02.sberdevices.ru (localhost [127.0.0.1]) by mx.sberdevices.ru (Postfix) with ESMTP id 6F3135FD4A; Wed, 17 May 2023 22:52:54 +0300 (MSK) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sberdevices.ru; s=mail; t=1684353174; bh=YmT+l9X9SmMH7zZqlQ+weSzx21Uldk76YJ6cQHzhBtc=; h=From:To:Subject:Date:Message-ID:MIME-Version:Content-Type; b=HHrWkoMDHzGITY0PMWZY074JTPiKS6APJWl0CiTUZB/TCNjxlHme8QKxDIfsiJ508 NcVbezkkyfXzKsLkSHj7NgJ+qJcP6a0WITdqzsxYRTCWsmwLXq0FYJKBY51dO/r8dY cM9QFbPRcj5uj75lino4ea/Yejd3nqUKS6iidhbM9a8XrGygKExDHfnO7xT93NqOR7 QaUiuanDOC8FIHXITCIZ/z1ozydiBRa2E3z297dLNzKaURD3dZ6qLhXIW1mOJKV2h9 BV3S3YG/06MXtJFyhUhj8hXuDISuVdICq/69Oc/jVGYW6zTHhM34ej8fPKZ97htlWp QQcD64ZxIxlzA== Received: from S-MS-EXCH01.sberdevices.ru (S-MS-EXCH01.sberdevices.ru [172.16.1.4]) by mx.sberdevices.ru (Postfix) with ESMTP; Wed, 17 May 2023 22:52:54 +0300 (MSK) From: Martin Kurbanov To: Pavel Machek , Lee Jones , Rob Herring , Krzysztof Kozlowski , Andy Shevchenko CC: , , , , Martin Kurbanov Subject: [PATCH v4 2/2] leds: add aw20xx driver Date: Wed, 17 May 2023 22:52:38 +0300 Message-ID: <20230517195238.34069-3-mmkurbanov@sberdevices.ru> X-Mailer: git-send-email 2.40.0 In-Reply-To: <20230517195238.34069-1-mmkurbanov@sberdevices.ru> References: <20230517195238.34069-1-mmkurbanov@sberdevices.ru> MIME-Version: 1.0 X-Originating-IP: [172.16.1.6] X-ClientProxiedBy: S-MS-EXCH01.sberdevices.ru (172.16.1.4) To S-MS-EXCH01.sberdevices.ru (172.16.1.4) X-KSMG-Rule-ID: 4 X-KSMG-Message-Action: clean X-KSMG-AntiSpam-Status: not scanned, disabled by settings X-KSMG-AntiSpam-Interceptor-Info: not scanned X-KSMG-AntiPhishing: not scanned, disabled by settings X-KSMG-AntiVirus: Kaspersky Secure Mail Gateway, version 1.1.2.30, bases: 2023/05/17 11:04:00 #21328336 X-KSMG-AntiVirus-Status: Clean, skipped X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,SPF_HELO_NONE,SPF_NONE, T_SCC_BODY_TEXT_LINE,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1766172636741634834?= X-GMAIL-MSGID: =?utf-8?q?1766172636741634834?= This commit adds support for AWINIC AW20036/AW20054/AW20072 LED driver. This driver supports following AW200XX features: - Individual 64-level DIM currents Signed-off-by: Martin Kurbanov Reviewed-by: Andy Shevchenko --- .../testing/sysfs-class-led-driver-aw200xx | 5 + drivers/leds/Kconfig | 13 + drivers/leds/Makefile | 1 + drivers/leds/leds-aw200xx.c | 593 ++++++++++++++++++ 4 files changed, 612 insertions(+) create mode 100644 Documentation/ABI/testing/sysfs-class-led-driver-aw200xx create mode 100644 drivers/leds/leds-aw200xx.c diff --git a/Documentation/ABI/testing/sysfs-class-led-driver-aw200xx b/Documentation/ABI/testing/sysfs-class-led-driver-aw200xx new file mode 100644 index 000000000000..2122e3ee3d95 --- /dev/null +++ b/Documentation/ABI/testing/sysfs-class-led-driver-aw200xx @@ -0,0 +1,5 @@ +What: /sys/class/leds//dim +Date: March 2023 +Description: 64-level DIM current. If you write a negative value or + "auto", the dim will be calculated according to the + brightness. diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig index 499d0f215a8b..065aac96728b 100644 --- a/drivers/leds/Kconfig +++ b/drivers/leds/Kconfig @@ -94,6 +94,19 @@ config LEDS_ARIEL Say Y to if your machine is a Dell Wyse 3020 thin client. +config LEDS_AW200XX + tristate "LED support for Awinic AW20036/AW20054/AW20072" + depends on LEDS_CLASS + depends on I2C + help + This option enables support for the AW20036/AW20054/AW20072 LED driver. + It is a 3x12/6x9/6x12 matrix LED driver programmed via + an I2C interface, up to 36/54/72 LEDs or 12/18/24 RGBs, + 3 pattern controllers for auto breathing or group dimming control. + + To compile this driver as a module, choose M here: the module + will be called leds-aw200xx. + config LEDS_AW2013 tristate "LED support for Awinic AW2013" depends on LEDS_CLASS && I2C && OF diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile index 4fd2f92cd198..f611e48cd3f5 100644 --- a/drivers/leds/Makefile +++ b/drivers/leds/Makefile @@ -15,6 +15,7 @@ obj-$(CONFIG_LEDS_AN30259A) += leds-an30259a.o obj-$(CONFIG_LEDS_APU) += leds-apu.o obj-$(CONFIG_LEDS_ARIEL) += leds-ariel.o obj-$(CONFIG_LEDS_ASIC3) += leds-asic3.o +obj-$(CONFIG_LEDS_AW200XX) += leds-aw200xx.o obj-$(CONFIG_LEDS_AW2013) += leds-aw2013.o obj-$(CONFIG_LEDS_BCM6328) += leds-bcm6328.o obj-$(CONFIG_LEDS_BCM6358) += leds-bcm6358.o diff --git a/drivers/leds/leds-aw200xx.c b/drivers/leds/leds-aw200xx.c new file mode 100644 index 000000000000..78c2478be127 --- /dev/null +++ b/drivers/leds/leds-aw200xx.c @@ -0,0 +1,593 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Awinic AW20036/AW20054/AW20072 LED driver + * + * Copyright (c) 2023, SberDevices. All Rights Reserved. + * + * Author: Martin Kurbanov + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define AW200XX_DIM_MAX (BIT(6) - 1) +#define AW200XX_FADE_MAX (BIT(8) - 1) +#define AW200XX_IMAX_DEFAULT_uA 60000 +#define AW200XX_IMAX_MAX_uA 160000 +#define AW200XX_IMAX_MIN_uA 3300 + +/* Page 0 */ +#define AW200XX_REG_PAGE0_BASE 0xc000 + +/* Select page register */ +#define AW200XX_REG_PAGE 0xF0 +#define AW200XX_PAGE_MASK (GENMASK(7, 6) | GENMASK(2, 0)) +#define AW200XX_PAGE_SHIFT 0 +#define AW200XX_NUM_PAGES 6 +#define AW200XX_PAGE_SIZE 256 +#define AW200XX_REG(page, reg) \ + (AW200XX_REG_PAGE0_BASE + (page) * AW200XX_PAGE_SIZE + (reg)) +#define AW200XX_REG_MAX \ + AW200XX_REG(AW200XX_NUM_PAGES - 1, AW200XX_PAGE_SIZE - 1) +#define AW200XX_PAGE0 0 +#define AW200XX_PAGE1 1 +#define AW200XX_PAGE2 2 +#define AW200XX_PAGE3 3 +#define AW200XX_PAGE4 4 +#define AW200XX_PAGE5 5 + +/* Chip ID register */ +#define AW200XX_REG_IDR AW200XX_REG(AW200XX_PAGE0, 0x00) +#define AW200XX_IDR_CHIPID 0x18 + +/* Sleep mode register */ +#define AW200XX_REG_SLPCR AW200XX_REG(AW200XX_PAGE0, 0x01) +#define AW200XX_SLPCR_ACTIVE 0x00 + +/* Reset register */ +#define AW200XX_REG_RSTR AW200XX_REG(AW200XX_PAGE0, 0x02) +#define AW200XX_RSTR_RESET 0x01 + +/* Global current configuration register */ +#define AW200XX_REG_GCCR AW200XX_REG(AW200XX_PAGE0, 0x03) +#define AW200XX_GCCR_IMAX_MASK GENMASK(7, 4) +#define AW200XX_GCCR_IMAX(x) ((x) << 4) +#define AW200XX_GCCR_ALLON BIT(3) + +/* Fast clear display control register */ +#define AW200XX_REG_FCD AW200XX_REG(AW200XX_PAGE0, 0x04) +#define AW200XX_FCD_CLEAR 0x01 + +/* Display size configuration */ +#define AW200XX_REG_DSIZE AW200XX_REG(AW200XX_PAGE0, 0x80) +#define AW200XX_DSIZE_COLUMNS_MAX 12 + +#define AW200XX_LED2REG(x, columns) \ + ((x) + (((x) / (columns)) * (AW200XX_DSIZE_COLUMNS_MAX - (columns)))) + +/* + * DIM current configuration register (page 4). + * The even address for current DIM configuration. + * The odd address for current FADE configuration + */ +#define AW200XX_REG_DIM(x, columns) \ + AW200XX_REG(AW200XX_PAGE4, AW200XX_LED2REG(x, columns) * 2) +#define AW200XX_REG_DIM2FADE(x) ((x) + 1) + +/* + * Duty ratio of display scan (see p.15 of datasheet for formula): + * duty = (592us / 600.5us) * (1 / (display_rows + 1)) + * + * Multiply to 1000 (MILLI) to improve the accuracy of calculations. + */ +#define AW200XX_DUTY_RATIO(rows) \ + (((592UL * USEC_PER_SEC) / 600500UL) * (MILLI / (rows)) / MILLI) + +struct aw200xx_chipdef { + u32 channels; + u32 display_size_rows_max; + u32 display_size_columns; +}; + +struct aw200xx_led { + struct led_classdev cdev; + struct aw200xx *chip; + int dim; + u32 num; +}; + +struct aw200xx { + const struct aw200xx_chipdef *cdef; + struct i2c_client *client; + struct regmap *regmap; + struct mutex mutex; + u32 num_leds; + u32 display_rows; + struct aw200xx_led leds[]; +}; + +static ssize_t dim_show(struct device *dev, struct device_attribute *devattr, + char *buf) +{ + struct led_classdev *cdev = dev_get_drvdata(dev); + struct aw200xx_led *led = container_of(cdev, struct aw200xx_led, cdev); + int dim = led->dim; + + if (dim < 0) + return sysfs_emit(buf, "auto\n"); + + return sysfs_emit(buf, "%d\n", dim); +} + +static ssize_t dim_store(struct device *dev, struct device_attribute *devattr, + const char *buf, size_t count) +{ + struct led_classdev *cdev = dev_get_drvdata(dev); + struct aw200xx_led *led = container_of(cdev, struct aw200xx_led, cdev); + struct aw200xx *chip = led->chip; + u32 columns = chip->cdef->display_size_columns; + int dim; + ssize_t ret; + + if (sysfs_streq(buf, "auto")) { + dim = -1; + } else { + ret = kstrtoint(buf, 0, &dim); + if (ret) + return ret; + + if (dim > AW200XX_DIM_MAX) + return -EINVAL; + } + + mutex_lock(&chip->mutex); + + if (dim >= 0) { + ret = regmap_write(chip->regmap, + AW200XX_REG_DIM(led->num, columns), dim); + if (ret) + goto out_unlock; + } + + led->dim = dim; + ret = count; + +out_unlock: + mutex_unlock(&chip->mutex); + return ret; +} +static DEVICE_ATTR_RW(dim); + +static struct attribute *dim_attrs[] = { + &dev_attr_dim.attr, + NULL +}; +ATTRIBUTE_GROUPS(dim); + +static int aw200xx_brightness_set(struct led_classdev *cdev, + enum led_brightness brightness) +{ + struct aw200xx_led *led = container_of(cdev, struct aw200xx_led, cdev); + struct aw200xx *chip = led->chip; + int dim; + u32 reg; + int ret; + + mutex_lock(&chip->mutex); + + reg = AW200XX_REG_DIM(led->num, chip->cdef->display_size_columns); + + dim = led->dim; + if (dim < 0) + dim = max_t(int, + brightness / (AW200XX_FADE_MAX / AW200XX_DIM_MAX), + 1); + + ret = regmap_write(chip->regmap, reg, dim); + if (ret) + goto out_unlock; + + ret = regmap_write(chip->regmap, + AW200XX_REG_DIM2FADE(reg), brightness); + +out_unlock: + mutex_unlock(&chip->mutex); + + return ret; +} + +static u32 aw200xx_imax_from_global(const struct aw200xx *const chip, + u32 global_imax_uA) +{ + u64 led_imax_uA; + + /* + * The output current of each LED (see p.14 of datasheet for formula): + * Iled = Imax * (dim / 63) * ((fade + 1) / 256) * duty + * + * The value of duty is determined by the following formula: + * duty = (592us / 600.5us) * (1 / (display_rows + 1)) + * + * Calculated for the maximum values of fade and dim. + * We divide by 1000 because we earlier multiplied by 1000 to improve + * accuracy when calculating the duty. + */ + led_imax_uA = global_imax_uA * AW200XX_DUTY_RATIO(chip->display_rows); + do_div(led_imax_uA, MILLI); + + return led_imax_uA; +} + +static u32 aw200xx_imax_to_global(const struct aw200xx *const chip, + u32 led_imax_uA) +{ + u32 duty = AW200XX_DUTY_RATIO(chip->display_rows); + + /* The output current of each LED (see p.14 of datasheet for formula) */ + return (led_imax_uA * 1000U) / duty; +} + +#define AW200XX_IMAX_MULTIPLIER1 10000 +#define AW200XX_IMAX_MULTIPLIER2 3333 +#define AW200XX_IMAX_BASE_VAL1 0 +#define AW200XX_IMAX_BASE_VAL2 8 + +/* + * The AW200XX has a 4-bit register (GCCR) to configure the global current, + * which ranges from 3.3mA to 160mA. The following table indicates the values + * of the global current, divided into two parts: + * + * +-----------+-----------------+-----------+-----------------+ + * | reg value | global max (mA) | reg value | global max (mA) | + * +-----------+-----------------+-----------+-----------------+ + * | 0 | 10 | 8 | 3.3 | + * | 1 | 20 | 9 | 6.7 | + * | 2 | 30 | 10 | 10 | + * | 3 | 40 | 11 | 13.3 | + * | 4 | 60 | 12 | 20 | + * | 5 | 80 | 13 | 26.7 | + * | 6 | 120 | 14 | 40 | + * | 7 | 160 | 15 | 53.3 | + * +-----------+-----------------+-----------+-----------------+ + * + * The left part with a multiplier of 10, and the right part with a multiplier + * of 3.3. + * So we have two formulas to calculate the global current: + * for the left part of the table: + * imax = coefficient * 10 + * + * for the right part of the table: + * imax = coefficient * 3.3 + * + * The coefficient table consists of the following values: + * 1, 2, 3, 4, 6, 8, 12, 16. + */ +static int aw200xx_set_imax(const struct aw200xx *const chip, + u32 led_imax_uA) +{ + u32 g_imax_uA = aw200xx_imax_to_global(chip, led_imax_uA); + u32 coeff_table[] = {1, 2, 3, 4, 6, 8, 12, 16}; + u32 gccr_imax = UINT_MAX; + u32 cur_imax = 0; + int i; + + for (i = 0; i < ARRAY_SIZE(coeff_table); i++) { + u32 imax; + + /* select closest ones */ + imax = coeff_table[i] * AW200XX_IMAX_MULTIPLIER1; + if (g_imax_uA >= imax && imax > cur_imax) { + cur_imax = imax; + gccr_imax = i + AW200XX_IMAX_BASE_VAL1; + } + + imax = coeff_table[i] * AW200XX_IMAX_MULTIPLIER2; + imax = DIV_ROUND_CLOSEST(imax, 100) * 100; + if (g_imax_uA >= imax && imax > cur_imax) { + cur_imax = imax; + gccr_imax = i + AW200XX_IMAX_BASE_VAL2; + } + } + + if (gccr_imax == UINT_MAX) + return -EINVAL; + + return regmap_update_bits(chip->regmap, AW200XX_REG_GCCR, + AW200XX_GCCR_IMAX_MASK, + AW200XX_GCCR_IMAX(gccr_imax)); +} + +static int aw200xx_chip_reset(const struct aw200xx *const chip) +{ + int ret; + + ret = regmap_write(chip->regmap, AW200XX_REG_RSTR, AW200XX_RSTR_RESET); + if (ret) + return ret; + + regcache_mark_dirty(chip->regmap); + return regmap_write(chip->regmap, AW200XX_REG_FCD, AW200XX_FCD_CLEAR); +} + +static int aw200xx_chip_init(const struct aw200xx *const chip) +{ + int ret; + + ret = regmap_write(chip->regmap, AW200XX_REG_DSIZE, + chip->display_rows - 1); + if (ret) + return ret; + + ret = regmap_write(chip->regmap, AW200XX_REG_SLPCR, + AW200XX_SLPCR_ACTIVE); + if (ret) + return ret; + + return regmap_update_bits(chip->regmap, AW200XX_REG_GCCR, + AW200XX_GCCR_ALLON, AW200XX_GCCR_ALLON); +} + +static int aw200xx_chip_check(const struct aw200xx *const chip) +{ + struct device *dev = &chip->client->dev; + u32 chipid; + int ret; + + ret = regmap_read(chip->regmap, AW200XX_REG_IDR, &chipid); + if (ret) + return dev_err_probe(dev, ret, "Failed to read chip ID\n"); + + if (chipid != AW200XX_IDR_CHIPID) + return dev_err_probe(dev, -ENODEV, + "Chip reported wrong ID: %x\n", chipid); + + return 0; +} + +static int aw200xx_probe_dt(struct device *dev, struct aw200xx *chip) +{ + struct fwnode_handle *child; + u32 current_min, current_max, min_uA; + int ret; + int i = 0; + + ret = device_property_read_u32(dev, "awinic,display-rows", + &chip->display_rows); + if (ret) + return dev_err_probe(dev, ret, + "Failed to read 'display-rows' property\n"); + + if (!chip->display_rows || + chip->display_rows > chip->cdef->display_size_rows_max) { + return dev_err_probe(dev, ret, + "Invalid leds display size %u\n", + chip->display_rows); + } + + current_max = aw200xx_imax_from_global(chip, AW200XX_IMAX_MAX_uA); + current_min = aw200xx_imax_from_global(chip, AW200XX_IMAX_MIN_uA); + min_uA = UINT_MAX; + + device_for_each_child_node(dev, child) { + struct led_init_data init_data = {}; + struct aw200xx_led *led; + u32 source, imax; + + ret = fwnode_property_read_u32(child, "reg", &source); + if (ret) { + dev_err(dev, "Missing reg property\n"); + chip->num_leds--; + continue; + } + + if (source >= chip->cdef->channels) { + dev_err(dev, "LED reg %u out of range (max %u)\n", + source, chip->cdef->channels); + chip->num_leds--; + continue; + } + + ret = fwnode_property_read_u32(child, "led-max-microamp", + &imax); + if (ret) { + dev_info(&chip->client->dev, + "DT property led-max-microamp is missing\n"); + } else if (imax < current_min || imax > current_max) { + dev_err(dev, "Invalid value %u for led-max-microamp\n", + imax); + chip->num_leds--; + continue; + } else { + min_uA = min(min_uA, imax); + } + + led = &chip->leds[i]; + led->dim = -1; + led->num = source; + led->chip = chip; + led->cdev.brightness_set_blocking = aw200xx_brightness_set; + led->cdev.groups = dim_groups; + init_data.fwnode = child; + + ret = devm_led_classdev_register_ext(dev, &led->cdev, + &init_data); + if (ret) { + fwnode_handle_put(child); + break; + } + + i++; + } + + if (!chip->num_leds) + return -EINVAL; + + if (min_uA == UINT_MAX) { + min_uA = aw200xx_imax_from_global(chip, + AW200XX_IMAX_DEFAULT_uA); + } + + return aw200xx_set_imax(chip, min_uA); +} + +static const struct regmap_range_cfg aw200xx_ranges[] = { + { + .name = "aw200xx", + .range_min = 0, + .range_max = AW200XX_REG_MAX, + .selector_reg = AW200XX_REG_PAGE, + .selector_mask = AW200XX_PAGE_MASK, + .selector_shift = AW200XX_PAGE_SHIFT, + .window_start = 0, + .window_len = AW200XX_PAGE_SIZE, + }, +}; + +static const struct regmap_range aw200xx_writeonly_ranges[] = { + regmap_reg_range(AW200XX_REG(AW200XX_PAGE1, 0x00), AW200XX_REG_MAX), +}; + +static const struct regmap_access_table aw200xx_readable_table = { + .no_ranges = aw200xx_writeonly_ranges, + .n_no_ranges = ARRAY_SIZE(aw200xx_writeonly_ranges), +}; + +static const struct regmap_range aw200xx_readonly_ranges[] = { + regmap_reg_range(AW200XX_REG_IDR, AW200XX_REG_IDR), +}; + +static const struct regmap_access_table aw200xx_writeable_table = { + .no_ranges = aw200xx_readonly_ranges, + .n_no_ranges = ARRAY_SIZE(aw200xx_readonly_ranges), +}; + +static const struct regmap_config aw200xx_regmap_config = { + .reg_bits = 8, + .val_bits = 8, + .max_register = AW200XX_REG_MAX, + .ranges = aw200xx_ranges, + .num_ranges = ARRAY_SIZE(aw200xx_ranges), + .rd_table = &aw200xx_readable_table, + .wr_table = &aw200xx_writeable_table, + .cache_type = REGCACHE_RBTREE, +}; + +static int aw200xx_probe(struct i2c_client *client) +{ + const struct aw200xx_chipdef *cdef; + struct aw200xx *chip; + int count; + int ret; + + cdef = device_get_match_data(&client->dev); + if (!cdef) + return -ENODEV; + + count = device_get_child_node_count(&client->dev); + if (!count || count > cdef->channels) + return dev_err_probe(&client->dev, -EINVAL, + "Incorrect number of leds (%d)", count); + + chip = devm_kzalloc(&client->dev, struct_size(chip, leds, count), + GFP_KERNEL); + if (!chip) + return -ENOMEM; + + chip->cdef = cdef; + chip->num_leds = count; + chip->client = client; + i2c_set_clientdata(client, chip); + + chip->regmap = devm_regmap_init_i2c(client, &aw200xx_regmap_config); + if (IS_ERR(chip->regmap)) + return PTR_ERR(chip->regmap); + + ret = aw200xx_chip_check(chip); + if (ret) + return ret; + + mutex_init(&chip->mutex); + + /* Need a lock now since after call aw200xx_probe_dt, sysfs nodes created */ + mutex_lock(&chip->mutex); + + ret = aw200xx_probe_dt(&client->dev, chip); + if (ret < 0) + goto out_unlock; + + ret = aw200xx_chip_reset(chip); + if (ret) + goto out_unlock; + + ret = aw200xx_chip_init(chip); + +out_unlock: + mutex_unlock(&chip->mutex); + return ret; +} + +static void aw200xx_remove(struct i2c_client *client) +{ + struct aw200xx *chip = i2c_get_clientdata(client); + + aw200xx_chip_reset(chip); + mutex_destroy(&chip->mutex); +} + +static const struct aw200xx_chipdef aw20036_cdef = { + .channels = 36, + .display_size_rows_max = 3, + .display_size_columns = 12, +}; + +static const struct aw200xx_chipdef aw20054_cdef = { + .channels = 54, + .display_size_rows_max = 6, + .display_size_columns = 9, +}; + +static const struct aw200xx_chipdef aw20072_cdef = { + .channels = 72, + .display_size_rows_max = 6, + .display_size_columns = 12, +}; + +static const struct i2c_device_id aw200xx_id[] = { + { "aw20036" }, + { "aw20054" }, + { "aw20072" }, + {} +}; +MODULE_DEVICE_TABLE(i2c, aw200xx_id); + +static const struct of_device_id aw200xx_match_table[] = { + { .compatible = "awinic,aw20036", .data = &aw20036_cdef, }, + { .compatible = "awinic,aw20054", .data = &aw20054_cdef, }, + { .compatible = "awinic,aw20072", .data = &aw20072_cdef, }, + {} +}; +MODULE_DEVICE_TABLE(of, aw200xx_match_table); + +static struct i2c_driver aw200xx_driver = { + .driver = { + .name = "aw200xx", + .of_match_table = aw200xx_match_table, + }, + .probe_new = aw200xx_probe, + .remove = aw200xx_remove, + .id_table = aw200xx_id, +}; +module_i2c_driver(aw200xx_driver); + +MODULE_AUTHOR("Martin Kurbanov "); +MODULE_DESCRIPTION("AW200XX LED driver"); +MODULE_LICENSE("GPL");