From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754847Ab2ENHUq (ORCPT ); Mon, 14 May 2012 03:20:46 -0400 Received: from hqemgate03.nvidia.com ([216.228.121.140]:1727 "EHLO hqemgate03.nvidia.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754569Ab2ENHUp (ORCPT ); Mon, 14 May 2012 03:20:45 -0400 X-PGP-Universal: processed; by hqnvupgp05.nvidia.com on Mon, 14 May 2012 00:20:38 -0700 From: Laxman Dewangan To: , , , , CC: , Laxman Dewangan Subject: [PATCH V2] gpio: rc5t583: add gpio driver for RICOH PMIC RC5T583 Date: Mon, 14 May 2012 12:46:12 +0530 Message-ID: <1336979772-4139-1-git-send-email-ldewangan@nvidia.com> X-Mailer: git-send-email 1.7.1.1 MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The PMIC device RC5T583 from RICOH supports 8 gpios. Adding gpio driver for this device to access the pins control through gpio library. Signed-off-by: Laxman Dewangan --- Changes from V1: - Removing init flags through platform data. - Configuring pins to gpio mode in direction_* functions. drivers/gpio/Kconfig | 9 ++ drivers/gpio/Makefile | 1 + drivers/gpio/gpio-rc5t583.c | 185 +++++++++++++++++++++++++++++++++++++++++++ include/linux/mfd/rc5t583.h | 2 + 4 files changed, 197 insertions(+), 0 deletions(-) create mode 100644 drivers/gpio/gpio-rc5t583.c diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig index 0833ed5..34899cd 100644 --- a/drivers/gpio/Kconfig +++ b/drivers/gpio/Kconfig @@ -306,6 +306,15 @@ config GPIO_PCF857X This driver provides an in-kernel interface to those GPIOs using platform-neutral GPIO calls. +config GPIO_RC5T583 + bool "RICOH RC5T583 GPIO" + depends on MFD_RC5T583 + help + Select this option to enable GPIO driver for the Ricoh RC5T583 + chip family. + This driver provides the support for driving/reading the gpio pins + of RC5T583 device through standard gpio library. + config GPIO_SX150X bool "Semtech SX150x I2C GPIO expander" depends on I2C=y diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile index ad96381..58897a8 100644 --- a/drivers/gpio/Makefile +++ b/drivers/gpio/Makefile @@ -45,6 +45,7 @@ obj-$(CONFIG_GPIO_PCF857X) += gpio-pcf857x.o obj-$(CONFIG_GPIO_PCH) += gpio-pch.o obj-$(CONFIG_GPIO_PL061) += gpio-pl061.o obj-$(CONFIG_GPIO_PXA) += gpio-pxa.o +obj-$(CONFIG_GPIO_RC5T583) += gpio-rc5t583.o obj-$(CONFIG_GPIO_RDC321X) += gpio-rdc321x.o obj-$(CONFIG_PLAT_SAMSUNG) += gpio-samsung.o obj-$(CONFIG_ARCH_SA1100) += gpio-sa1100.o diff --git a/drivers/gpio/gpio-rc5t583.c b/drivers/gpio/gpio-rc5t583.c new file mode 100644 index 0000000..b5459c1 --- /dev/null +++ b/drivers/gpio/gpio-rc5t583.c @@ -0,0 +1,185 @@ +/* + * GPIO driver for RICOH583 power management chip. + * + * Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved. + * Author: Laxman dewangan + * + * Based on code + * Copyright (C) 2011 RICOH COMPANY,LTD + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see . + * + */ +#include +#include +#include +#include +#include +#include +#include +#include + +struct rc5t583_gpio { + struct gpio_chip gpio_chip; + struct rc5t583 *rc5t583; +}; + +static inline struct rc5t583_gpio *to_rc5t583_gpio(struct gpio_chip *chip) +{ + return container_of(chip, struct rc5t583_gpio, gpio_chip); +} + +static int rc5t583_gpio_get(struct gpio_chip *gc, unsigned int offset) +{ + struct rc5t583_gpio *rc5t583_gpio = to_rc5t583_gpio(gc); + struct device *parent = rc5t583_gpio->rc5t583->dev; + uint8_t val = 0; + int ret; + + ret = rc5t583_read(parent, RC5T583_GPIO_MON_IOIN, &val); + if (ret < 0) + return ret; + + return !!(val & BIT(offset)); +} + +static void rc5t583_gpio_set(struct gpio_chip *gc, unsigned int offset, int val) +{ + struct rc5t583_gpio *rc5t583_gpio = to_rc5t583_gpio(gc); + struct device *parent = rc5t583_gpio->rc5t583->dev; + if (val) + rc5t583_set_bits(parent, RC5T583_GPIO_IOOUT, BIT(offset)); + else + rc5t583_clear_bits(parent, RC5T583_GPIO_IOOUT, BIT(offset)); +} + +static int rc5t583_gpio_dir_input(struct gpio_chip *gc, unsigned int offset) +{ + struct rc5t583_gpio *rc5t583_gpio = to_rc5t583_gpio(gc); + struct device *parent = rc5t583_gpio->rc5t583->dev; + int ret; + + ret = rc5t583_clear_bits(parent, RC5T583_GPIO_IOSEL, BIT(offset)); + if (ret < 0) + return ret; + + /* Set pin to gpio mode */ + return rc5t583_clear_bits(parent, RC5T583_GPIO_PGSEL, BIT(offset)); +} + +static int rc5t583_gpio_dir_output(struct gpio_chip *gc, unsigned offset, + int value) +{ + struct rc5t583_gpio *rc5t583_gpio = to_rc5t583_gpio(gc); + struct device *parent = rc5t583_gpio->rc5t583->dev; + int ret; + + rc5t583_gpio_set(gc, offset, value); + ret = rc5t583_set_bits(parent, RC5T583_GPIO_IOSEL, BIT(offset)); + if (ret < 0) + return ret; + + /* Set pin to gpio mode */ + return rc5t583_clear_bits(parent, RC5T583_GPIO_PGSEL, BIT(offset)); +} + +static int rc5t583_gpio_to_irq(struct gpio_chip *gc, unsigned offset) +{ + struct rc5t583_gpio *rc5t583_gpio = to_rc5t583_gpio(gc); + + if ((offset >= 0) && (offset < 8)) + return rc5t583_gpio->rc5t583->irq_base + + RC5T583_IRQ_GPIO0 + offset; + return -EINVAL; +} + +static void rc5t583_gpio_free(struct gpio_chip *gc, unsigned offset) +{ + struct rc5t583_gpio *rc5t583_gpio = to_rc5t583_gpio(gc); + struct device *parent = rc5t583_gpio->rc5t583->dev; + + rc5t583_set_bits(parent, RC5T583_GPIO_PGSEL, BIT(offset)); +} + +static int __devinit rc5t583_gpio_probe(struct platform_device *pdev) +{ + struct rc5t583 *rc5t583 = dev_get_drvdata(pdev->dev.parent); + struct rc5t583_platform_data *pdata = dev_get_platdata(rc5t583->dev); + struct rc5t583_gpio *rc5t583_gpio; + int ret; + + rc5t583_gpio = devm_kzalloc(&pdev->dev, sizeof(*rc5t583_gpio), + GFP_KERNEL); + if (!rc5t583_gpio) { + dev_warn(&pdev->dev, "Mem allocation for rc5t583_gpio failed"); + return -ENOMEM; + } + + rc5t583_gpio->gpio_chip.label = "gpio-rc5t583", + rc5t583_gpio->gpio_chip.owner = THIS_MODULE, + rc5t583_gpio->gpio_chip.free = rc5t583_gpio_free, + rc5t583_gpio->gpio_chip.direction_input = rc5t583_gpio_dir_input, + rc5t583_gpio->gpio_chip.direction_output = rc5t583_gpio_dir_output, + rc5t583_gpio->gpio_chip.set = rc5t583_gpio_set, + rc5t583_gpio->gpio_chip.get = rc5t583_gpio_get, + rc5t583_gpio->gpio_chip.to_irq = rc5t583_gpio_to_irq, + rc5t583_gpio->gpio_chip.ngpio = RC5T583_MAX_GPIO, + rc5t583_gpio->gpio_chip.can_sleep = 1, + rc5t583_gpio->gpio_chip.dev = &pdev->dev; + + if (pdata && pdata->gpio_base) + rc5t583_gpio->gpio_chip.base = pdata->gpio_base; + else + rc5t583_gpio->gpio_chip.base = -1; + + rc5t583_gpio->rc5t583 = rc5t583; + + platform_set_drvdata(pdev, rc5t583_gpio); + + ret = gpiochip_add(&rc5t583_gpio->gpio_chip); + if (ret < 0) + dev_err(&pdev->dev, "Could not register gpio %d\n", ret); + + return ret; +} + +static int __devexit rc5t583_gpio_remove(struct platform_device *pdev) +{ + struct rc5t583_gpio *rc5t583_gpio = platform_get_drvdata(pdev); + + return gpiochip_remove(&rc5t583_gpio->gpio_chip); +} + +static struct platform_driver rc5t583_gpio_driver = { + .driver.name = "rc5t583-gpio", + .driver.owner = THIS_MODULE, + .probe = rc5t583_gpio_probe, + .remove = __devexit_p(rc5t583_gpio_remove), +}; + +static int __init rc5t583_gpio_init(void) +{ + return platform_driver_register(&rc5t583_gpio_driver); +} +subsys_initcall(rc5t583_gpio_init); + +static void __exit rc5t583_gpio_exit(void) +{ + platform_driver_unregister(&rc5t583_gpio_driver); +} +module_exit(rc5t583_gpio_exit); + +MODULE_AUTHOR("Laxman Dewangan "); +MODULE_DESCRIPTION("GPIO interface for RC5T583"); +MODULE_LICENSE("GPL v2"); +MODULE_ALIAS("platform:rc5t583-gpio"); diff --git a/include/linux/mfd/rc5t583.h b/include/linux/mfd/rc5t583.h index c42fe92..3661c59 100644 --- a/include/linux/mfd/rc5t583.h +++ b/include/linux/mfd/rc5t583.h @@ -292,6 +292,7 @@ struct rc5t583 { * rc5t583_platform_data: Platform data for ricoh rc5t583 pmu. * The board specific data is provided through this structure. * @irq_base: Irq base number on which this device registers their interrupts. + * @gpio_base: GPIO base from which gpio of this device will start. * @enable_shutdown: Enable shutdown through the input pin "shutdown". * @regulator_deepsleep_slot: The slot number on which device goes to sleep * in device sleep mode. @@ -303,6 +304,7 @@ struct rc5t583 { struct rc5t583_platform_data { int irq_base; + int gpio_base; bool enable_shutdown; int regulator_deepsleep_slot[RC5T583_REGULATOR_MAX]; unsigned long regulator_ext_pwr_control[RC5T583_REGULATOR_MAX]; -- 1.7.1.1