From patchwork Wed Jul 5 23:13:26 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Marek Vasut X-Patchwork-Id: 701388 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 EBD54EB64DA for ; Wed, 5 Jul 2023 23:13:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232326AbjGEXNp (ORCPT ); Wed, 5 Jul 2023 19:13:45 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38350 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230383AbjGEXNm (ORCPT ); Wed, 5 Jul 2023 19:13:42 -0400 Received: from phobos.denx.de (phobos.denx.de [IPv6:2a01:238:438b:c500:173d:9f52:ddab:ee01]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 819881BCB; Wed, 5 Jul 2023 16:13:39 -0700 (PDT) Received: from tr.lan (ip-86-49-120-218.bb.vodafone.cz [86.49.120.218]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) (No client certificate requested) (Authenticated sender: marex@denx.de) by phobos.denx.de (Postfix) with ESMTPSA id 3E7DE85813; Thu, 6 Jul 2023 01:13:37 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=denx.de; s=phobos-20191101; t=1688598817; bh=WjB8x2YEpHsB6EtGS4Y5dabSFrTWLR2s9M/BTnjAOj0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Z5kWfn3a0lnDcysCRe2F+zEdd6t/fkykMYMvHwn66wZeInmVAfgBYjymygVNMotAe Kyg/5V8r6y6o8qVe2E4XM4zOYH2Oa3iajzFe+BiBkaF6dHz3awpvwxZd4KyjXJ+SpP IVRdg8dfo1V1KUYuQ3nsRnKf7gB/32oyUnYrJmUZvzCLvy8g4gsjXnM8OBeCSDBLwM xAti+HCG9TJk0rmcPoMkS9mq549SAb+O3vVLQXdAreBKq2Na5vuh5YkSuqhJlDZ7Lk DEKI+eQTxk9f3FkhK/OrPV4+2w8DRD8fi9f6t6p276VE4kdEWwHDctRSp/Zz66Aw6H g8wYoNf9ek1OQ== From: Marek Vasut To: linux-leds@vger.kernel.org Cc: Isai Gaspar , Marek Vasut , Conor Dooley , Krzysztof Kozlowski , Lee Jones , Pavel Machek , Rob Herring , devicetree@vger.kernel.org Subject: [PATCH v3 2/2] leds: pca995x: Add support for PCA995X chips Date: Thu, 6 Jul 2023 01:13:26 +0200 Message-Id: <20230705231326.232356-2-marex@denx.de> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20230705231326.232356-1-marex@denx.de> References: <20230705231326.232356-1-marex@denx.de> MIME-Version: 1.0 X-Virus-Scanned: clamav-milter 0.103.8 at phobos.denx.de X-Virus-Status: Clean Precedence: bulk List-ID: X-Mailing-List: linux-leds@vger.kernel.org From: Isai Gaspar The PCA995x chips are I2C controlled LED drivers. Each chip has up to 16 outputs, each one with an individual 8-bit resolution PWM for brightness control. Signed-off-by: Isai Gaspar Signed-off-by: Marek Vasut # Basically rewrite the driver --- Cc: Conor Dooley Cc: Isai Gaspar Cc: Krzysztof Kozlowski Cc: Lee Jones Cc: Marek Vasut Cc: Pavel Machek Cc: Rob Herring Cc: devicetree@vger.kernel.org Cc: linux-leds@vger.kernel.org --- V2: - Fix pca995x_probe() type - Fix device_get_match_data() cast V3: - Drop of_match_ptr() --- drivers/leds/Kconfig | 9 ++ drivers/leds/Makefile | 1 + drivers/leds/leds-pca995x.c | 198 ++++++++++++++++++++++++++++++++++++ 3 files changed, 208 insertions(+) create mode 100644 drivers/leds/leds-pca995x.c diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig index 6046dfeca16fc..b92208eccdea9 100644 --- a/drivers/leds/Kconfig +++ b/drivers/leds/Kconfig @@ -521,6 +521,15 @@ config LEDS_PCA963X LED driver chip accessed via the I2C bus. Supported devices include PCA9633 and PCA9634 +config LEDS_PCA995X + tristate "LED Support for PCA995x I2C chips" + depends on LEDS_CLASS + depends on I2C + help + This option enables support for LEDs connected to PCA995x + LED driver chips accessed via the I2C bus. Supported + devices include PCA9955BTW, PCA9952TW and PCA9955TW. + config LEDS_WM831X_STATUS tristate "LED support for status LEDs on WM831x PMICs" depends on LEDS_CLASS diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile index d71f1226540c2..d7348e8bc019a 100644 --- a/drivers/leds/Makefile +++ b/drivers/leds/Makefile @@ -72,6 +72,7 @@ obj-$(CONFIG_LEDS_OT200) += leds-ot200.o obj-$(CONFIG_LEDS_PCA9532) += leds-pca9532.o obj-$(CONFIG_LEDS_PCA955X) += leds-pca955x.o obj-$(CONFIG_LEDS_PCA963X) += leds-pca963x.o +obj-$(CONFIG_LEDS_PCA995X) += leds-pca995x.o obj-$(CONFIG_LEDS_PM8058) += leds-pm8058.o obj-$(CONFIG_LEDS_POWERNV) += leds-powernv.o obj-$(CONFIG_LEDS_PWM) += leds-pwm.o diff --git a/drivers/leds/leds-pca995x.c b/drivers/leds/leds-pca995x.c new file mode 100644 index 0000000000000..dde99f4a4c1c7 --- /dev/null +++ b/drivers/leds/leds-pca995x.c @@ -0,0 +1,198 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * LED driver for PCA995x I2C LED drivers + * + * Copyright 2011 bct electronic GmbH + * Copyright 2013 Qtechnology/AS + * Copyright 2022 NXP + * Copyright 2023 Marek Vasut + */ + +#include +#include +#include +#include +#include +#include + +/* Register definition */ +#define PCA995X_MODE1 0x00 +#define PCA995X_MODE2 0x01 +#define PCA995X_LEDOUT0 0x02 +#define PCA9955B_PWM0 0x08 +#define PCA9952_PWM0 0x0A +#define PCA9952_IREFALL 0x43 +#define PCA9955B_IREFALL 0x45 + +/* LED select registers determine the source that drives LED outputs */ +#define PCA995X_LED_OFF 0x0 /* LED driver off */ +#define PCA995X_LED_ON 0x1 /* LED driver on */ +#define PCA995X_LED_PWM 0x2 /* Controlled through PWM */ +#define PCA995X_LDRX_MASK 0x3 /* 2 bits per output state control */ + +#define PCA995X_MODE_1_CFG 0x00 /* Auto-increment disabled. Normal mode */ +#define PCA995X_IREFALL_CFG 0x7F /* Half of max current gain multiplier */ + +#define PCA995X_MAX_OUTPUTS 16 /* Supported outputs */ + +#define ldev_to_led(c) container_of(c, struct pca995x_led, ldev) + +struct pca995x_led { + unsigned int led_no; + struct led_classdev ldev; + struct pca995x_chip *chip; +}; + +struct pca995x_chip { + struct regmap *regmap; + struct pca995x_led leds[PCA995X_MAX_OUTPUTS]; + int btype; +}; + +static int pca995x_brightness_set(struct led_classdev *led_cdev, + enum led_brightness brightness) +{ + struct pca995x_led *led = ldev_to_led(led_cdev); + struct pca995x_chip *chip = led->chip; + u8 ledout_addr, pwmout_addr; + int shift, ret; + + pwmout_addr = (chip->btype ? PCA9955B_PWM0 : PCA9952_PWM0) + led->led_no; + ledout_addr = PCA995X_LEDOUT0 + (led->led_no / 4); + shift = 2 * (led->led_no % 4); + + switch (brightness) { + case LED_FULL: + return regmap_update_bits(chip->regmap, ledout_addr, + PCA995X_LDRX_MASK << shift, + PCA995X_LED_ON << shift); + case LED_OFF: + return regmap_update_bits(chip->regmap, ledout_addr, + PCA995X_LDRX_MASK << shift, 0); + default: + /* Adjust brightness as per user input by changing individual PWM */ + ret = regmap_write(chip->regmap, pwmout_addr, brightness); + if (ret) + return ret; + + /* + * Change LDRx configuration to individual brightness via PWM. + * Led will stop blinking if it's doing so + */ + return regmap_update_bits(chip->regmap, ledout_addr, + PCA995X_LDRX_MASK << shift, + PCA995X_LED_PWM << shift); + } +} + +static const struct regmap_config pca995x_regmap = { + .reg_bits = 8, + .val_bits = 8, + .max_register = 0x49, +}; + +static int pca995x_probe(struct i2c_client *client) +{ + struct fwnode_handle *led_fwnodes[PCA995X_MAX_OUTPUTS] = { 0 }; + struct fwnode_handle *np, *child; + struct device *dev = &client->dev; + struct pca995x_chip *chip; + struct pca995x_led *led; + int i, btype, reg, ret; + + btype = (unsigned long)device_get_match_data(&client->dev); + + np = dev_fwnode(dev); + if (!np) + return -ENODEV; + + chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL); + if (!chip) + return -ENOMEM; + + chip->btype = btype; + chip->regmap = devm_regmap_init_i2c(client, &pca995x_regmap); + if (IS_ERR(chip->regmap)) + return PTR_ERR(chip->regmap); + + i2c_set_clientdata(client, chip); + + fwnode_for_each_available_child_node(np, child) { + ret = fwnode_property_read_u32(child, "reg", ®); + if (ret) { + fwnode_handle_put(child); + return ret; + } + + if (reg < 0 || reg >= PCA995X_MAX_OUTPUTS || led_fwnodes[reg]) { + fwnode_handle_put(child); + return -EINVAL; + } + + led = &chip->leds[reg]; + led_fwnodes[reg] = child; + led->chip = chip; + led->led_no = reg; + led->ldev.brightness_set_blocking = pca995x_brightness_set; + led->ldev.max_brightness = 255; + } + + for (i = 0; i < PCA995X_MAX_OUTPUTS; i++) { + struct led_init_data init_data = {}; + + if (!led_fwnodes[i]) + continue; + + init_data.fwnode = led_fwnodes[i]; + + ret = devm_led_classdev_register_ext(dev, + &chip->leds[i].ldev, + &init_data); + if (ret < 0) { + fwnode_handle_put(child); + return dev_err_probe(dev, ret, + "Could not register LED %s\n", + chip->leds[i].ldev.name); + } + } + + /* Disable LED all-call address and set normal mode */ + ret = regmap_write(chip->regmap, PCA995X_MODE1, PCA995X_MODE_1_CFG); + if (ret) + return ret; + + /* IREF Output current value for all LEDn outputs */ + return regmap_write(chip->regmap, + btype ? PCA9955B_IREFALL : PCA9952_IREFALL, + PCA995X_IREFALL_CFG); +} + +static const struct i2c_device_id pca995x_id[] = { + { "pca9952", .driver_data = (kernel_ulong_t)0 /* non-B chip */ }, + { "pca9955b", .driver_data = (kernel_ulong_t)1 /* B-type chip */ }, + {} +}; +MODULE_DEVICE_TABLE(i2c, pca995x_id); + +static const struct of_device_id pca995x_of_match[] = { + { .compatible = "nxp,pca9952", .data = (void *)0 /* non-B chip */ }, + { .compatible = "nxp,pca9955b", .data = (void *)1 /* B-type chip */ }, + {}, +}; +MODULE_DEVICE_TABLE(i2c, pca995x_of_match); + +static struct i2c_driver pca995x_driver = { + .driver = { + .name = "leds-pca995x", + .owner = THIS_MODULE, + .of_match_table = pca995x_of_match, + }, + .probe = pca995x_probe, + .id_table = pca995x_id, +}; + +module_i2c_driver(pca995x_driver); + +MODULE_AUTHOR("Isai Gaspar "); +MODULE_DESCRIPTION("PCA995x LED driver"); +MODULE_LICENSE("GPL");