From patchwork Thu Nov 21 06:40:41 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ming Yu X-Patchwork-Id: 13881702 Received: from mail-pg1-f176.google.com (mail-pg1-f176.google.com [209.85.215.176]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A4B061CB306; Thu, 21 Nov 2024 06:41:10 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.215.176 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1732171272; cv=none; b=r3WweFYhxOXDh7cmi3/N6z6amlShW18FIZekorDAEggfVWSYl7YGJurDrMY1T0XUh/M7R7yN0jCljqRFYReS4Vy2/Zf1sJ0XdeM0t73y5V0RX5sXAyBwBVkU5NiRo0T1YllQmAgPvo1oqzmWf6fmCnrHEutJbjfd1PrdSKe5iqE= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1732171272; c=relaxed/simple; bh=K7S8SXf3E31TM1mBHOTndKgVL+cg8ph+SloNbaVP4Dk=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=EoD4LYcKUzbsQ8fvYaSat/oCe1hRThM4/pDNpS2+bt+eCfH+hPvCFTglrtFQ5yNPIIPEruSgMNXGJKTiVnXmfhuCABDxO6vIB8oNgYezq2LKQp/amYoy2us/yy8rojMmNYX98Q/W9xpo99LAYL4J2tzFUY1uxPSfIQMzoFyfrPU= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=lkGzph0n; arc=none smtp.client-ip=209.85.215.176 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="lkGzph0n" Received: by mail-pg1-f176.google.com with SMTP id 41be03b00d2f7-7edb6879196so479756a12.3; Wed, 20 Nov 2024 22:41:10 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1732171270; x=1732776070; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=hWTz/CCxD6wE1B6xtr3ZE+FE9Zph7go2Puk8PDECfpk=; b=lkGzph0nykF9LrpX38cSHsesdQUqv2dvHDfDonXByPz+dpSNEPw7Ff8NLgfw2Oj/Sr 98REFiVxGrWAzGuI6ZEsFzJ3mJB46jRe6w/BQOVTZn6+VvxXHyL4/40Z7YBLAXcCPh1M VXltl3l2gwqJZFy9CxC7m1ZqWVn3RqggZSVFak8k9jLGZs5qFkrneRgDJnVi7kvoeA5q lec/m5XknGP5n6kpKU5jibV20m8s3D51aCEMUN9Td19KsDhth3IPk5g7YIWBq+gIEP/k fiQ8qAKQZ6g787gOok2eR+AA8/hZEF1T1MFwy+jtZNK+NnYNVxHHJh5ae7KPpFRLZ69K nx9Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1732171270; x=1732776070; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=hWTz/CCxD6wE1B6xtr3ZE+FE9Zph7go2Puk8PDECfpk=; b=BjKxMk2Bqk8LGPpg8u58uCrkEzHGZsz7T+2Cd7kLEB1Xw++kH/TbGjevQf85UnhK/7 Wr+cdYy1CvA7xA8b48GNWMCNQ78hacjQinBCjBHss6GT/g+IcNW8jQ2Sqo6ssG8xstmg hkOKsLImxvmIFf0xFVPwOzyghVK/+Zh3uL7F6rphv4Z0+ejNmAyNTwktiGxe1bzveF7B LyvMkg08obWhgQ+yKRikKroDqZ+dqwH191XYfw/e3ObYEfdGm3xNpHeb/Qrqh6y6Ez9Y nA+Y9Ut9PE+ag4h7FrqZ54QmYyCouEV4ucZN6KIgo7jC4Cs9PzVXeOZTYmRFGVL1khW0 Ubug== X-Forwarded-Encrypted: i=1; AJvYcCUK9OSvppMALCyb5VNTMyhHVZfw0K/ll/us3hWIGmlbrvieFsx682jS4YxiY+NzTTxNZlCwfCEbIq5XTK4=@vger.kernel.org, AJvYcCUNO86xoLk+BmWnWC0EnjKRPDAN3LYiGr3iyX17XHMUCp54dmy2+7paVZ35RaHTHC4Q+7OHDAIcX5M=@vger.kernel.org, AJvYcCVZjfS6ZoPoosmw7GeBQvHX8L+yTbEA6ETelmwdKKIgSs9k5cMoIFvjdoTCSAKADcXRvbUe9z3r@vger.kernel.org, AJvYcCW8FmH4Dad9tXKWWgtjE7s+QnPvn9bBDWwkwRMDp/eM8cNjwrp7k29koMbBAIOmPnSN3hVS54RrufihWeHc/ec=@vger.kernel.org, AJvYcCWl5MGfCKMpgBRtNxhiehmwHqh32LKiHsOXJHbjDDepDP4euXw1Tx0e5viRrVzK8BK2VCrUX9/wdxXk@vger.kernel.org, AJvYcCX/38L5Y8VdqE9iLzILJw+0YHfZLzOTR1r+xd6+eqfVTW2XnXxLh4NWNl/YMyZV8cnYGeyUrpuA38r8@vger.kernel.org, AJvYcCXjGEk5sv01I6ywvTX2Wrc7TThbeg0Dp6CP+A+3EqaQ+fLOSBxTEzk0Xu37eIhHp+Y50uANZ2uEtOtIyw==@vger.kernel.org X-Gm-Message-State: AOJu0YxOkMTyqxNgd3l+mrbSwwiE5wZ1EbXkqmqL0SOLAUmzCoxEpwKP gScTSMeS4+AV+s9PgiNk2bgtJuXh7xthdYCskVEWHei6DoKUD0nj X-Gm-Gg: ASbGnctn2AxI/M/y5E2FUPJKPXr9pvhYiXNV4J8AEd7qz7e0LR3NnsGS2GKxmLCLmRs c5ouJZFKgiweRoTOxupLzgleMWnxyrNDU1e+iGxD0cGSHvB21+TQMaUmcAmEgqXxk0tZ/daBZp1 JuP+5MFHncRT0FJn3LWsjomml+NuS2Py6ZKy8zGr8ALyz4R+oZR+UjOq4MkP8D3JUfXVqr6slCX EN51ag7mfk9gj/+aFo2L8moLlLYPCdhtSPbxIUhuEWViECCEi5GxMzyoqvnJuhs6rDp7IcjwBgv YSfcJOGm+5Hd X-Google-Smtp-Source: AGHT+IEIpRcSYA3dtbiUCuQMLwfuQUevbjED3YAUq2sxzHHTrR5Nr6a0NFwL4oWW1bu4ac2Ta3w6oA== X-Received: by 2002:a05:6a20:a10e:b0:1d5:1354:5256 with SMTP id adf61e73a8af0-1ddb033a1aamr8036224637.39.1732171269680; Wed, 20 Nov 2024 22:41:09 -0800 (PST) Received: from hcdev-d520mt2.. (60-250-196-139.hinet-ip.hinet.net. [60.250.196.139]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-724beeb83d4sm2812530b3a.40.2024.11.20.22.41.06 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 20 Nov 2024 22:41:09 -0800 (PST) From: Ming Yu X-Google-Original-From: Ming Yu To: tmyu0@nuvoton.com, lee@kernel.org, linus.walleij@linaro.org, brgl@bgdev.pl, andi.shyti@kernel.org, mkl@pengutronix.de, mailhol.vincent@wanadoo.fr, andrew+netdev@lunn.ch, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, wim@linux-watchdog.org, linux@roeck-us.net, jdelvare@suse.com, alexandre.belloni@bootlin.com Cc: linux-kernel@vger.kernel.org, linux-gpio@vger.kernel.org, linux-i2c@vger.kernel.org, linux-can@vger.kernel.org, netdev@vger.kernel.org, linux-watchdog@vger.kernel.org, linux-hwmon@vger.kernel.org, linux-rtc@vger.kernel.org Subject: [PATCH v2 2/7] gpio: Add Nuvoton NCT6694 GPIO support Date: Thu, 21 Nov 2024 14:40:41 +0800 Message-Id: <20241121064046.3724726-3-tmyu0@nuvoton.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20241121064046.3724726-1-tmyu0@nuvoton.com> References: <20241121064046.3724726-1-tmyu0@nuvoton.com> Precedence: bulk X-Mailing-List: linux-watchdog@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 This driver supports GPIO and IRQ functionality for NCT6694 MFD device based on USB interface. Signed-off-by: Ming Yu --- MAINTAINERS | 1 + drivers/gpio/Kconfig | 12 + drivers/gpio/Makefile | 1 + drivers/gpio/gpio-nct6694.c | 441 ++++++++++++++++++++++++++++++++++++ 4 files changed, 455 insertions(+) create mode 100644 drivers/gpio/gpio-nct6694.c diff --git a/MAINTAINERS b/MAINTAINERS index 9c9a94ff8f98..6688c5c470b7 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -16545,6 +16545,7 @@ NUVOTON NCT6694 MFD DRIVER M: Ming Yu L: linux-kernel@vger.kernel.org S: Supported +F: drivers/gpio/gpio-nct6694.c F: drivers/mfd/nct6694.c F: include/linux/mfd/nct6694.h diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig index 56fee58e281e..7773b5326e60 100644 --- a/drivers/gpio/Kconfig +++ b/drivers/gpio/Kconfig @@ -1460,6 +1460,18 @@ config GPIO_MAX77650 GPIO driver for MAX77650/77651 PMIC from Maxim Semiconductor. These chips have a single pin that can be configured as GPIO. +config GPIO_NCT6694 + tristate "Nuvoton NCT6694 GPIO controller support" + depends on MFD_NCT6694 + select GENERIC_IRQ_CHIP + select GPIOLIB_IRQCHIP + help + This driver supports 8 GPIO pins per bank that can all be interrupt + sources. + + This driver can also be built as a module. If so, the module will be + called gpio-nct6694. + config GPIO_PALMAS bool "TI PALMAS series PMICs GPIO" depends on MFD_PALMAS diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile index af3ba4d81b58..ad80a078b27b 100644 --- a/drivers/gpio/Makefile +++ b/drivers/gpio/Makefile @@ -123,6 +123,7 @@ obj-$(CONFIG_GPIO_MXC) += gpio-mxc.o obj-$(CONFIG_GPIO_MXS) += gpio-mxs.o obj-$(CONFIG_GPIO_NOMADIK) += gpio-nomadik.o obj-$(CONFIG_GPIO_NPCM_SGPIO) += gpio-npcm-sgpio.o +obj-$(CONFIG_GPIO_NCT6694) += gpio-nct6694.o obj-$(CONFIG_GPIO_OCTEON) += gpio-octeon.o obj-$(CONFIG_GPIO_OMAP) += gpio-omap.o obj-$(CONFIG_GPIO_PALMAS) += gpio-palmas.o diff --git a/drivers/gpio/gpio-nct6694.c b/drivers/gpio/gpio-nct6694.c new file mode 100644 index 000000000000..1776200b3a04 --- /dev/null +++ b/drivers/gpio/gpio-nct6694.c @@ -0,0 +1,441 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Nuvoton NCT6694 GPIO controller driver based on USB interface. + * + * Copyright (C) 2024 Nuvoton Technology Corp. + */ + +#include +#include +#include +#include +#include +#include + +/* Host interface */ +#define NCT6694_GPIO_MOD 0xFF +#define NCT6694_GPIO_LEN 0x01 + +/* Report Channel */ +#define NCT6694_GPIO_VER 0x90 +#define NCT6694_GPIO_VALID 0x110 +#define NCT6694_GPI_DATA 0x120 +#define NCT6694_GPO_DIR 0x170 +#define NCT6694_GPO_TYPE 0x180 +#define NCT6694_GPO_DATA 0x190 + +#define NCT6694_GPI_STS 0x130 +#define NCT6694_GPI_CLR 0x140 +#define NCT6694_GPI_FALLING 0x150 +#define NCT6694_GPI_RISING 0x160 + +#define NCT6694_NR_GPIO 8 + +struct nct6694_gpio_data { + struct nct6694 *nct6694; + struct gpio_chip gpio; + struct mutex lock; + /* Protect irq operation */ + struct mutex irq_lock; + + unsigned char xmit_buf; + unsigned char irq_trig_falling; + unsigned char irq_trig_rising; + + /* Current gpio group */ + unsigned char group; + + /* GPIO line names */ + char **names; +}; + +static int nct6694_get_direction(struct gpio_chip *gpio, unsigned int offset) +{ + struct nct6694_gpio_data *data = gpiochip_get_data(gpio); + int ret; + + guard(mutex)(&data->lock); + + ret = nct6694_read_msg(data->nct6694, NCT6694_GPIO_MOD, + NCT6694_GPO_DIR + data->group, + NCT6694_GPIO_LEN, &data->xmit_buf); + if (ret < 0) + return ret; + + return !(BIT(offset) & data->xmit_buf); +} + +static int nct6694_direction_input(struct gpio_chip *gpio, unsigned int offset) +{ + struct nct6694_gpio_data *data = gpiochip_get_data(gpio); + int ret; + + guard(mutex)(&data->lock); + + ret = nct6694_read_msg(data->nct6694, NCT6694_GPIO_MOD, + NCT6694_GPO_DIR + data->group, + NCT6694_GPIO_LEN, &data->xmit_buf); + if (ret < 0) + return ret; + + data->xmit_buf &= ~(1 << offset); + + return nct6694_write_msg(data->nct6694, NCT6694_GPIO_MOD, + NCT6694_GPO_DIR + data->group, + NCT6694_GPIO_LEN, &data->xmit_buf); +} + +static int nct6694_direction_output(struct gpio_chip *gpio, + unsigned int offset, int val) +{ + struct nct6694_gpio_data *data = gpiochip_get_data(gpio); + int ret; + + guard(mutex)(&data->lock); + + /* Set direction to output */ + ret = nct6694_read_msg(data->nct6694, NCT6694_GPIO_MOD, + NCT6694_GPO_DIR + data->group, + NCT6694_GPIO_LEN, &data->xmit_buf); + if (ret < 0) + return ret; + + data->xmit_buf |= (1 << offset); + ret = nct6694_write_msg(data->nct6694, NCT6694_GPIO_MOD, + NCT6694_GPO_DIR + data->group, + NCT6694_GPIO_LEN, &data->xmit_buf); + if (ret < 0) + return ret; + + /* Then set output level */ + ret = nct6694_read_msg(data->nct6694, NCT6694_GPIO_MOD, + NCT6694_GPO_DATA + data->group, + NCT6694_GPIO_LEN, &data->xmit_buf); + if (ret < 0) + return ret; + + if (val) + data->xmit_buf |= (1 << offset); + else + data->xmit_buf &= ~(1 << offset); + + return nct6694_write_msg(data->nct6694, NCT6694_GPIO_MOD, + NCT6694_GPO_DATA + data->group, + NCT6694_GPIO_LEN, &data->xmit_buf); +} + +static int nct6694_get_value(struct gpio_chip *gpio, unsigned int offset) +{ + struct nct6694_gpio_data *data = gpiochip_get_data(gpio); + int ret; + + guard(mutex)(&data->lock); + + ret = nct6694_read_msg(data->nct6694, NCT6694_GPIO_MOD, + NCT6694_GPO_DIR + data->group, + NCT6694_GPIO_LEN, &data->xmit_buf); + if (ret < 0) + return ret; + + if (BIT(offset) & data->xmit_buf) { + ret = nct6694_read_msg(data->nct6694, NCT6694_GPIO_MOD, + NCT6694_GPO_DATA + data->group, + NCT6694_GPIO_LEN, &data->xmit_buf); + if (ret < 0) + return ret; + + return !!(BIT(offset) & data->xmit_buf); + } + + ret = nct6694_read_msg(data->nct6694, NCT6694_GPIO_MOD, + NCT6694_GPI_DATA + data->group, + NCT6694_GPIO_LEN, &data->xmit_buf); + if (ret < 0) + return ret; + + return !!(BIT(offset) & data->xmit_buf); +} + +static void nct6694_set_value(struct gpio_chip *gpio, unsigned int offset, + int val) +{ + struct nct6694_gpio_data *data = gpiochip_get_data(gpio); + + guard(mutex)(&data->lock); + + nct6694_read_msg(data->nct6694, NCT6694_GPIO_MOD, + NCT6694_GPO_DATA + data->group, + NCT6694_GPIO_LEN, &data->xmit_buf); + + if (val) + data->xmit_buf |= (1 << offset); + else + data->xmit_buf &= ~(1 << offset); + + nct6694_write_msg(data->nct6694, NCT6694_GPIO_MOD, + NCT6694_GPO_DATA + data->group, + NCT6694_GPIO_LEN, &data->xmit_buf); +} + +static int nct6694_set_config(struct gpio_chip *gpio, unsigned int offset, + unsigned long config) +{ + struct nct6694_gpio_data *data = gpiochip_get_data(gpio); + int ret; + + guard(mutex)(&data->lock); + + ret = nct6694_read_msg(data->nct6694, NCT6694_GPIO_MOD, + NCT6694_GPO_TYPE + data->group, + NCT6694_GPIO_LEN, &data->xmit_buf); + if (ret < 0) + return ret; + + switch (pinconf_to_config_param(config)) { + case PIN_CONFIG_DRIVE_OPEN_DRAIN: + data->xmit_buf |= (1 << offset); + break; + case PIN_CONFIG_DRIVE_PUSH_PULL: + data->xmit_buf &= ~(1 << offset); + break; + default: + return -ENOTSUPP; + } + + return nct6694_write_msg(data->nct6694, NCT6694_GPIO_MOD, + NCT6694_GPO_TYPE + data->group, + NCT6694_GPIO_LEN, &data->xmit_buf); +} + +static int nct6694_init_valid_mask(struct gpio_chip *gpio, + unsigned long *valid_mask, + unsigned int ngpios) +{ + struct nct6694_gpio_data *data = gpiochip_get_data(gpio); + int ret; + + guard(mutex)(&data->lock); + + ret = nct6694_read_msg(data->nct6694, NCT6694_GPIO_MOD, + NCT6694_GPIO_VALID + data->group, + NCT6694_GPIO_LEN, &data->xmit_buf); + if (ret < 0) + return ret; + + *valid_mask = data->xmit_buf; + + return ret; +} + +static irqreturn_t nct6694_irq_handler(int irq, void *priv) +{ + struct nct6694_gpio_data *data = priv; + unsigned char status; + + guard(mutex)(&data->lock); + + nct6694_read_msg(data->nct6694, NCT6694_GPIO_MOD, + NCT6694_GPI_STS + data->group, + NCT6694_GPIO_LEN, &data->xmit_buf); + + status = data->xmit_buf; + + while (status) { + int bit = __ffs(status); + + data->xmit_buf = BIT(bit); + handle_nested_irq(irq_find_mapping(data->gpio.irq.domain, bit)); + status &= ~(1 << bit); + nct6694_write_msg(data->nct6694, NCT6694_GPIO_MOD, + NCT6694_GPI_CLR + data->group, + NCT6694_GPIO_LEN, &data->xmit_buf); + } + + return IRQ_HANDLED; +} + +static int nct6694_get_irq_trig(struct nct6694_gpio_data *data) +{ + int ret; + + guard(mutex)(&data->lock); + + ret = nct6694_read_msg(data->nct6694, NCT6694_GPIO_MOD, + NCT6694_GPI_FALLING + data->group, + NCT6694_GPIO_LEN, &data->irq_trig_falling); + if (ret) + return ret; + + return nct6694_read_msg(data->nct6694, NCT6694_GPIO_MOD, + NCT6694_GPI_RISING + data->group, + NCT6694_GPIO_LEN, &data->irq_trig_rising); +} + +static void nct6694_irq_mask(struct irq_data *d) +{ + struct gpio_chip *gpio = irq_data_get_irq_chip_data(d); + irq_hw_number_t hwirq = irqd_to_hwirq(d); + + gpiochip_disable_irq(gpio, hwirq); +} + +static void nct6694_irq_unmask(struct irq_data *d) +{ + struct gpio_chip *gpio = irq_data_get_irq_chip_data(d); + irq_hw_number_t hwirq = irqd_to_hwirq(d); + + gpiochip_enable_irq(gpio, hwirq); +} + +static int nct6694_irq_set_type(struct irq_data *d, unsigned int type) +{ + struct gpio_chip *gpio = irq_data_get_irq_chip_data(d); + struct nct6694_gpio_data *data = gpiochip_get_data(gpio); + irq_hw_number_t hwirq = irqd_to_hwirq(d); + + guard(mutex)(&data->lock); + + switch (type) { + case IRQ_TYPE_EDGE_RISING: + data->irq_trig_rising |= BIT(hwirq); + break; + + case IRQ_TYPE_EDGE_FALLING: + data->irq_trig_falling |= BIT(hwirq); + break; + + case IRQ_TYPE_EDGE_BOTH: + data->irq_trig_rising |= BIT(hwirq); + data->irq_trig_falling |= BIT(hwirq); + break; + + default: + return -ENOTSUPP; + } + + return 0; +} + +static void nct6694_irq_bus_lock(struct irq_data *d) +{ + struct gpio_chip *gpio = irq_data_get_irq_chip_data(d); + struct nct6694_gpio_data *data = gpiochip_get_data(gpio); + + mutex_lock(&data->irq_lock); +} + +static void nct6694_irq_bus_sync_unlock(struct irq_data *d) +{ + struct gpio_chip *gpio = irq_data_get_irq_chip_data(d); + struct nct6694_gpio_data *data = gpiochip_get_data(gpio); + + scoped_guard(mutex, &data->lock) { + nct6694_write_msg(data->nct6694, NCT6694_GPIO_MOD, + NCT6694_GPI_FALLING + data->group, + NCT6694_GPIO_LEN, &data->irq_trig_falling); + + nct6694_write_msg(data->nct6694, NCT6694_GPIO_MOD, + NCT6694_GPI_RISING + data->group, + NCT6694_GPIO_LEN, &data->irq_trig_rising); + } + + mutex_unlock(&data->irq_lock); +} + +static const struct irq_chip nct6694_irq_chip = { + .name = "nct6694-gpio", + .irq_mask = nct6694_irq_mask, + .irq_unmask = nct6694_irq_unmask, + .irq_set_type = nct6694_irq_set_type, + .irq_bus_lock = nct6694_irq_bus_lock, + .irq_bus_sync_unlock = nct6694_irq_bus_sync_unlock, + .flags = IRQCHIP_IMMUTABLE, + GPIOCHIP_IRQ_RESOURCE_HELPERS, +}; + +static int nct6694_gpio_probe(struct platform_device *pdev) +{ + const struct mfd_cell *cell = mfd_get_cell(pdev); + struct device *dev = &pdev->dev; + struct nct6694 *nct6694 = dev_get_drvdata(pdev->dev.parent); + struct nct6694_gpio_data *data; + struct gpio_irq_chip *girq; + int ret, irq, i; + + irq = irq_create_mapping(nct6694->domain, + NCT6694_IRQ_GPIO0 + cell->id); + if (!irq) + return -EINVAL; + + data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + data->names = devm_kzalloc(dev, sizeof(char *) * NCT6694_NR_GPIO, + GFP_KERNEL); + if (!data->names) + return -ENOMEM; + + for (i = 0; i < NCT6694_NR_GPIO; i++) { + data->names[i] = devm_kasprintf(dev, GFP_KERNEL, "GPIO%X%d", + cell->id, i); + if (!data->names[i]) + return -ENOMEM; + } + + data->nct6694 = nct6694; + data->group = cell->id; + + data->gpio.names = (const char * const*)data->names; + data->gpio.label = pdev->name; + data->gpio.direction_input = nct6694_direction_input; + data->gpio.get = nct6694_get_value; + data->gpio.direction_output = nct6694_direction_output; + data->gpio.set = nct6694_set_value; + data->gpio.get_direction = nct6694_get_direction; + data->gpio.set_config = nct6694_set_config; + data->gpio.init_valid_mask = nct6694_init_valid_mask; + data->gpio.base = -1; + data->gpio.can_sleep = false; + data->gpio.owner = THIS_MODULE; + data->gpio.ngpio = NCT6694_NR_GPIO; + + mutex_init(&data->irq_lock); + + platform_set_drvdata(pdev, data); + + ret = nct6694_get_irq_trig(data); + if (ret) + return dev_err_probe(dev, ret, "Failed to get irq trigger type\n"); + + /* Register gpio chip to GPIO framework */ + girq = &data->gpio.irq; + gpio_irq_chip_set_chip(girq, &nct6694_irq_chip); + girq->parent_handler = NULL; + girq->num_parents = 0; + girq->parents = NULL; + girq->default_type = IRQ_TYPE_NONE; + girq->handler = handle_level_irq; + girq->threaded = true; + + ret = devm_request_threaded_irq(dev, irq, NULL, nct6694_irq_handler, + IRQF_ONESHOT | IRQF_SHARED, + "nct6694-gpio", data); + if (ret) + return dev_err_probe(dev, ret, "Failed to request irq\n"); + + return devm_gpiochip_add_data(dev, &data->gpio, data); +} + +static struct platform_driver nct6694_gpio_driver = { + .driver = { + .name = "nct6694-gpio", + }, + .probe = nct6694_gpio_probe, +}; + +module_platform_driver(nct6694_gpio_driver); + +MODULE_DESCRIPTION("USB-GPIO controller driver for NCT6694"); +MODULE_AUTHOR("Ming Yu "); +MODULE_LICENSE("GPL");