From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9E6A72F25FB; Thu, 4 Dec 2025 16:14:48 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764864888; cv=none; b=XmByO1ohI9BAIa390V8ylFjstmRC+HbWBiSs4RjO3CnHMwyxqskIMjamWlCSZ6PYhHznVREAiDu5XFz9WYDs7qio+LRnx0ARkmmhaMnTISQWFdngv67g5glww6+iGmnxPaIU89auiwgiota2vAFWsRfdiohoossnBcDzKgWNUI0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764864888; c=relaxed/simple; bh=1a240qUNwRpp7E0DWtN3c5QpN6W09ooUSXnyyORu+vA=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=ok5docai4fYrf9SsuWAxBmTg1PVK1VdDm4nCJO2uzVTlrt3knpyWfx+6V6Nw0LDbaNBbzECI4K7LfnxRsTSTHLZlkx5A33Mw6r6C0/KRMtlWtnKUVq2DCuatJbGZFQWsVKfjziW+jRDLwArJZsosm62gYbX43euX+CUmLYHJEj4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=k+HxFeA0; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="k+HxFeA0" Received: by smtp.kernel.org (Postfix) with ESMTPS id 2BE4CC19423; Thu, 4 Dec 2025 16:14:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1764864888; bh=1a240qUNwRpp7E0DWtN3c5QpN6W09ooUSXnyyORu+vA=; h=From:Date:Subject:References:In-Reply-To:To:Cc:Reply-To:From; b=k+HxFeA03PoaoyIr2EsnceYORj7EBlgnJQLzpDRP9hiGOx7CQzwhyCS01CiA8e5j0 RwtcUF9SWpNGRGQHZZ5AwC6wKvlM0i9DZMd03BoiLj8Qws0iqDZYgiFWRyLmkhLn8X giGRMtSYt1T9h3ckO7v9jl750JTrW50+xtX1iy6rMmqwxzEWqH8d+7FuTmLFDQRAoL nvDaPgT7FR8JS8ofsoSQev1n4beTE0cl3vqWU4qy90DhL0BICiowRP+G6joLXt+T1k G3gwuc3bIHJmQRbOnCatbZDrsR3C1tLC37im7/qb9EWWVTE2BaaVFwkoP9+OIGJQ// zV0C5eYoyw0eA== Received: from aws-us-west-2-korg-lkml-1.web.codeaurora.org (localhost.localdomain [127.0.0.1]) by smtp.lore.kernel.org (Postfix) with ESMTP id 212E8D216A9; Thu, 4 Dec 2025 16:14:48 +0000 (UTC) From: =?utf-8?q?Nuno_S=C3=A1_via_B4_Relay?= Date: Thu, 04 Dec 2025 16:15:28 +0000 Subject: [PATCH v4 3/3] gpio: gpio-ltc4283: Add support for the LTC4283 Swap Controller Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit Message-Id: <20251204-ltc4283-support-v4-3-db0197fd7984@analog.com> References: <20251204-ltc4283-support-v4-0-db0197fd7984@analog.com> In-Reply-To: <20251204-ltc4283-support-v4-0-db0197fd7984@analog.com> To: linux-hwmon@vger.kernel.org, linux-gpio@vger.kernel.org, devicetree@vger.kernel.org, linux-doc@vger.kernel.org Cc: Krzysztof Kozlowski , Conor Dooley , Jean Delvare , Guenter Roeck , Jonathan Corbet , Linus Walleij , Bartosz Golaszewski , Bartosz Golaszewski X-Mailer: b4 0.14.3 X-Developer-Signature: v=1; a=ed25519-sha256; t=1764864927; l=8480; i=nuno.sa@analog.com; s=20231116; h=from:subject:message-id; bh=274uuD6hblb1TQOfNn4uzgf8N8qD12mYfwYVATLOEl4=; b=1jz77U7evMMgbd+2RI45gQYyh72Zl8rVXR/SngKaqO1Y4mZwG8FhfpZjRgMxKv6L9IN6ycqk8 SRlgQWdf80RBKa8+n0BIOAjk1Vi1SuzzG09+UklnOYK1mbHGgguhtqw X-Developer-Key: i=nuno.sa@analog.com; a=ed25519; pk=3NQwYA013OUYZsmDFBf8rmyyr5iQlxV/9H4/Df83o1E= X-Endpoint-Received: by B4 Relay for nuno.sa@analog.com/20231116 with auth_id=100 X-Original-From: =?utf-8?q?Nuno_S=C3=A1?= Reply-To: nuno.sa@analog.com From: Nuno Sá The LTC4283 device has up to 8 pins that can be configured as GPIOs. Note that PGIO pins are not set as GPIOs by default so if they are configured to be used as GPIOs we need to make sure to initialize them to a sane default. They are set as inputs by default. Acked-by: Bartosz Golaszewski Signed-off-by: Nuno Sá --- MAINTAINERS | 2 + drivers/gpio/Kconfig | 15 ++++ drivers/gpio/Makefile | 1 + drivers/gpio/gpio-ltc4283.c | 215 ++++++++++++++++++++++++++++++++++++++++++++ 4 files changed, 233 insertions(+) diff --git a/MAINTAINERS b/MAINTAINERS index 9fa27d0b1890..4d544996fde8 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -14957,9 +14957,11 @@ F: drivers/hwmon/ltc4282.c LTC4283 HARDWARE MONITOR AND GPIO DRIVER M: Nuno Sá +L: linux-gpio@vger.kernel.org L: linux-hwmon@vger.kernel.org S: Supported F: Documentation/devicetree/bindings/hwmon/adi,ltc4283.yaml +F: drivers/gpio/gpio-ltc4283.c F: drivers/hwmon/ltc4283.c LTC4286 HARDWARE MONITOR DRIVER diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig index c74da29253e8..5dc603268a75 100644 --- a/drivers/gpio/Kconfig +++ b/drivers/gpio/Kconfig @@ -1749,6 +1749,21 @@ config GPIO_WM8994 endmenu +menu "Auxiliary Bus GPIO drivers" + depends on AUXILIARY_BUS + +config GPIO_LTC4283 + tristate "Analog Devices LTC4283 GPIO support" + depends on SENSORS_LTC4283 + help + If you say yes here you want the GPIO function available in Analog + Devices LTC4283 Negative Voltage Hot Swap Controller. + + This driver can also be built as a module. If so, the module will + be called gpio-ltc4283. + +endmenu + menu "PCI GPIO expanders" depends on PCI diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile index 2421a8fd3733..f38e529f4618 100644 --- a/drivers/gpio/Makefile +++ b/drivers/gpio/Makefile @@ -100,6 +100,7 @@ obj-$(CONFIG_GPIO_LP873X) += gpio-lp873x.o obj-$(CONFIG_GPIO_LP87565) += gpio-lp87565.o obj-$(CONFIG_GPIO_LPC18XX) += gpio-lpc18xx.o obj-$(CONFIG_GPIO_LPC32XX) += gpio-lpc32xx.o +obj-$(CONFIG_GPIO_LTC4283) += gpio-ltc4283.o obj-$(CONFIG_GPIO_MACSMC) += gpio-macsmc.o obj-$(CONFIG_GPIO_MADERA) += gpio-madera.o obj-$(CONFIG_GPIO_MAX3191X) += gpio-max3191x.o diff --git a/drivers/gpio/gpio-ltc4283.c b/drivers/gpio/gpio-ltc4283.c new file mode 100644 index 000000000000..2b9412c837d2 --- /dev/null +++ b/drivers/gpio/gpio-ltc4283.c @@ -0,0 +1,215 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Analog Devices LTC4283 GPIO driver + * + * Copyright 2025 Analog Devices Inc. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define LTC4283_PINS_MAX 8 +#define LTC4283_PGIOX_START_NR 4 +#define LTC4283_INPUT_STATUS 0x02 +#define LTC4283_PGIO_CONFIG 0x10 +#define LTC4283_PGIO_CFG_MASK(pin) \ + GENMASK(((pin) - LTC4283_PGIOX_START_NR) * 2 + 1, (((pin) - LTC4283_PGIOX_START_NR) * 2)) +#define LTC4283_PGIO_CONFIG_2 0x11 + +#define LTC42823_ADIO_CONFIG 0x12 +/* starts at bit 4 */ +#define LTC4283_ADIOX_CONFIG_MASK(pin) BIT((pin) + 4) +#define LTC4283_PGIO_DIR_IN 3 +#define LTC4283_PGIO_DIR_OUT 2 + +struct ltc4283_gpio { + struct gpio_chip gpio_chip; + struct regmap *regmap; +}; + +static int ltc4283_pgio_get_direction(const struct ltc4283_gpio *st, unsigned int off) +{ + unsigned int val; + int ret; + + ret = regmap_read(st->regmap, LTC4283_PGIO_CONFIG, &val); + if (ret) + return ret; + + val = field_get(LTC4283_PGIO_CFG_MASK(off), val); + if (val == LTC4283_PGIO_DIR_IN) + return GPIO_LINE_DIRECTION_IN; + + return GPIO_LINE_DIRECTION_OUT; +} + +static int ltc4283_gpio_get_direction(struct gpio_chip *gc, unsigned int off) +{ + struct ltc4283_gpio *st = gpiochip_get_data(gc); + unsigned int val; + int ret; + + if (off >= LTC4283_PGIOX_START_NR) + return ltc4283_pgio_get_direction(st, off); + + ret = regmap_read(st->regmap, LTC42823_ADIO_CONFIG, &val); + if (ret) + return ret; + + if (val & LTC4283_ADIOX_CONFIG_MASK(off)) + return GPIO_LINE_DIRECTION_IN; + + return GPIO_LINE_DIRECTION_OUT; +} + +static int ltc4283_gpio_direction_set(const struct ltc4283_gpio *st, + unsigned int off, bool input) +{ + if (off >= LTC4283_PGIOX_START_NR) { + unsigned int val = LTC4283_PGIO_DIR_OUT; + + if (input) + val = LTC4283_PGIO_DIR_IN; + + val = field_prep(LTC4283_PGIO_CFG_MASK(off), val); + return regmap_update_bits(st->regmap, LTC4283_PGIO_CONFIG, + LTC4283_PGIO_CFG_MASK(off), val); + } + + return regmap_update_bits(st->regmap, LTC42823_ADIO_CONFIG, + LTC4283_ADIOX_CONFIG_MASK(off), + field_prep(LTC4283_ADIOX_CONFIG_MASK(off), input)); +} + +static int __ltc4283_gpio_set_value(const struct ltc4283_gpio *st, + unsigned int off, int val) +{ + u32 reg = off < LTC4283_PGIOX_START_NR ? LTC42823_ADIO_CONFIG : LTC4283_PGIO_CONFIG_2; + + return regmap_update_bits(st->regmap, reg, BIT(off), + field_prep(BIT(off), !!val)); +} + +static int ltc4283_gpio_direction_input(struct gpio_chip *gc, unsigned int off) +{ + struct ltc4283_gpio *st = gpiochip_get_data(gc); + + return ltc4283_gpio_direction_set(st, off, true); +} + +static int ltc4283_gpio_direction_output(struct gpio_chip *gc, unsigned int off, int val) +{ + struct ltc4283_gpio *st = gpiochip_get_data(gc); + int ret; + + ret = ltc4283_gpio_direction_set(st, off, false); + if (ret) + return ret; + + return __ltc4283_gpio_set_value(st, off, val); +} + +static int ltc4283_gpio_get_value(struct gpio_chip *gc, unsigned int off) +{ + struct ltc4283_gpio *st = gpiochip_get_data(gc); + unsigned int val, reg; + int ret, dir; + + dir = ltc4283_gpio_get_direction(gc, off); + if (dir < 0) + return dir; + + if (dir == GPIO_LINE_DIRECTION_IN) { + ret = regmap_read(st->regmap, LTC4283_INPUT_STATUS, &val); + if (ret) + return ret; + + /* ADIO1 is at bit 3. */ + if (off < LTC4283_PGIOX_START_NR) + return !!(val & BIT(3 - off)); + + /* PGIO1 is at bit 7. */ + return !!(val & BIT(7 - (off - LTC4283_PGIOX_START_NR))); + } + + if (off < LTC4283_PGIOX_START_NR) + reg = LTC42823_ADIO_CONFIG; + else + reg = LTC4283_PGIO_CONFIG_2; + + ret = regmap_read(st->regmap, reg, &val); + if (ret) + return ret; + + return !!(val & BIT(off)); +} + +static int ltc4283_gpio_set_value(struct gpio_chip *gc, unsigned int off, int val) +{ + struct ltc4283_gpio *st = gpiochip_get_data(gc); + + return __ltc4283_gpio_set_value(st, off, val); +} + +static int ltc4283_init_valid_mask(struct gpio_chip *gc, unsigned long *valid_mask, + unsigned int ngpios) +{ + unsigned long *mask = dev_get_platdata(gc->parent); + + bitmap_copy(valid_mask, mask, ngpios); + return 0; +} + +static int ltc4283_gpio_probe(struct auxiliary_device *adev, + const struct auxiliary_device_id *id) +{ + struct device *dev = &adev->dev; + struct ltc4283_gpio *st; + struct gpio_chip *gc; + + st = devm_kzalloc(dev, sizeof(*st), GFP_KERNEL); + if (!st) + return -ENOMEM; + + st->regmap = dev_get_regmap(dev->parent, NULL); + + gc = &st->gpio_chip; + gc->parent = dev; + gc->get_direction = ltc4283_gpio_get_direction; + gc->direction_input = ltc4283_gpio_direction_input; + gc->direction_output = ltc4283_gpio_direction_output; + gc->get = ltc4283_gpio_get_value; + gc->set = ltc4283_gpio_set_value; + gc->init_valid_mask = ltc4283_init_valid_mask; + gc->can_sleep = true; + + gc->base = -1; + gc->ngpio = LTC4283_PINS_MAX; + gc->label = adev->name; + gc->owner = THIS_MODULE; + + return devm_gpiochip_add_data(dev, &st->gpio_chip, st); +} + +static const struct auxiliary_device_id ltc4283_aux_id_table[] = { + { "ltc4283.gpio" }, + { } +}; +MODULE_DEVICE_TABLE(auxiliary, ltc4283_aux_id_table); + +static struct auxiliary_driver ltc4283_gpio_driver = { + .probe = ltc4283_gpio_probe, + .id_table = ltc4283_aux_id_table, +}; +module_auxiliary_driver(ltc4283_gpio_driver); + +MODULE_AUTHOR("Nuno Sá "); +MODULE_DESCRIPTION("GPIO LTC4283 Driver"); +MODULE_LICENSE("GPL"); -- 2.52.0