From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933818AbcHaI7e (ORCPT ); Wed, 31 Aug 2016 04:59:34 -0400 Received: from devils.ext.ti.com ([198.47.26.153]:60944 "EHLO devils.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1759670AbcHaI6l (ORCPT ); Wed, 31 Aug 2016 04:58:41 -0400 From: Keerthy To: CC: , , , , , , , Subject: [PATCH v9 2/3] gpio: lp873x: Add support for General Purpose Outputs Date: Wed, 31 Aug 2016 14:28:11 +0530 Message-ID: <1472633892-8261-3-git-send-email-j-keerthy@ti.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1472633892-8261-1-git-send-email-j-keerthy@ti.com> References: <1472633892-8261-1-git-send-email-j-keerthy@ti.com> 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 Add driver for lp873x PMIC family GPOs. Two GPOs are supported and can be configured in Open-drain output or Push-pull output. Acked-by: Linus Walleij Signed-off-by: Keerthy --- drivers/gpio/Kconfig | 10 +++ drivers/gpio/Makefile | 1 + drivers/gpio/gpio-lp873x.c | 193 +++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 204 insertions(+) create mode 100644 drivers/gpio/gpio-lp873x.c diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig index 30c5373..c489f50 100644 --- a/drivers/gpio/Kconfig +++ b/drivers/gpio/Kconfig @@ -880,6 +880,16 @@ config GPIO_LP3943 LP3943 can be used as a GPIO expander which provides up to 16 GPIOs. Open drain outputs are required for this usage. +config GPIO_LP873X + tristate "TI LP873X GPO" + depends on MFD_TI_LP873X + help + This driver supports the GPO on TI Lp873x PMICs. 2 GPOs are present + on LP873X PMICs. + + This driver can also be built as a module. If so, the module will be + called gpio-lp873x. + config GPIO_MAX77620 tristate "GPIO support for PMIC MAX77620 and MAX20024" depends on MFD_MAX77620 diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile index 691fb3a..b313fee 100644 --- a/drivers/gpio/Makefile +++ b/drivers/gpio/Makefile @@ -58,6 +58,7 @@ obj-$(CONFIG_GPIO_LOONGSON) += gpio-loongson.o obj-$(CONFIG_GPIO_LP3943) += gpio-lp3943.o obj-$(CONFIG_GPIO_LPC18XX) += gpio-lpc18xx.o obj-$(CONFIG_ARCH_LPC32XX) += gpio-lpc32xx.o +obj-$(CONFIG_GPIO_LP873X) += gpio-lp873x.o obj-$(CONFIG_GPIO_LYNXPOINT) += gpio-lynxpoint.o obj-$(CONFIG_GPIO_MAX730X) += gpio-max730x.o obj-$(CONFIG_GPIO_MAX7300) += gpio-max7300.o diff --git a/drivers/gpio/gpio-lp873x.c b/drivers/gpio/gpio-lp873x.c new file mode 100644 index 0000000..f10d49d --- /dev/null +++ b/drivers/gpio/gpio-lp873x.c @@ -0,0 +1,193 @@ +/* + * Copyright (C) 2016 Texas Instruments Incorporated - http://www.ti.com/ + * Keerthy + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed "as is" WITHOUT ANY WARRANTY of any + * kind, whether expressed or implied; without even the implied warranty + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License version 2 for more details. + * + * Based on the TPS65218 driver + */ + +#include +#include +#include +#include + +#include + +#define BITS_PER_GPO 0x4 +#define LP873X_GPO_CTRL_OD 0x2 + +struct lp873x_gpio { + struct gpio_chip chip; + struct lp873x *lp873; +}; + +static int lp873x_gpio_get_direction(struct gpio_chip *chip, + unsigned int offset) +{ + /* This device is output only */ + return 0; +} + +static int lp873x_gpio_direction_input(struct gpio_chip *chip, + unsigned int offset) +{ + /* This device is output only */ + return -EINVAL; +} + +static int lp873x_gpio_direction_output(struct gpio_chip *chip, + unsigned int offset, int value) +{ + struct lp873x_gpio *gpio = gpiochip_get_data(chip); + + /* Set the initial value */ + return regmap_update_bits(gpio->lp873->regmap, LP873X_REG_GPO_CTRL, + BIT(offset * BITS_PER_GPO), + value ? BIT(offset * BITS_PER_GPO) : 0); +} + +static int lp873x_gpio_get(struct gpio_chip *chip, unsigned int offset) +{ + struct lp873x_gpio *gpio = gpiochip_get_data(chip); + int ret, val; + + ret = regmap_read(gpio->lp873->regmap, LP873X_REG_GPO_CTRL, &val); + if (ret < 0) + return ret; + + return val & BIT(offset * BITS_PER_GPO); +} + +static void lp873x_gpio_set(struct gpio_chip *chip, unsigned int offset, + int value) +{ + struct lp873x_gpio *gpio = gpiochip_get_data(chip); + + regmap_update_bits(gpio->lp873->regmap, LP873X_REG_GPO_CTRL, + BIT(offset * BITS_PER_GPO), + value ? BIT(offset * BITS_PER_GPO) : 0); +} + +static int lp873x_gpio_request(struct gpio_chip *gc, unsigned int offset) +{ + struct lp873x_gpio *gpio = gpiochip_get_data(gc); + int ret; + + switch (offset) { + case 0: + /* No MUX Set up Needed for GPO */ + break; + case 1: + /* Setup the CLKIN_PIN_SEL MUX to GPO2 */ + ret = regmap_update_bits(gpio->lp873->regmap, LP873X_REG_CONFIG, + LP873X_CONFIG_CLKIN_PIN_SEL, 0); + if (ret) + return ret; + + break; + default: + return -EINVAL; + } + + return 0; +} + +static int lp873x_gpio_set_single_ended(struct gpio_chip *gc, + unsigned int offset, + enum single_ended_mode mode) +{ + struct lp873x_gpio *gpio = gpiochip_get_data(gc); + + switch (mode) { + case LINE_MODE_OPEN_DRAIN: + return regmap_update_bits(gpio->lp873->regmap, + LP873X_REG_GPO_CTRL, + BIT(offset * BITS_PER_GPO + + LP873X_GPO_CTRL_OD), + BIT(offset * BITS_PER_GPO + + LP873X_GPO_CTRL_OD)); + case LINE_MODE_PUSH_PULL: + return regmap_update_bits(gpio->lp873->regmap, + LP873X_REG_GPO_CTRL, + BIT(offset * BITS_PER_GPO + + LP873X_GPO_CTRL_OD), 0); + default: + return -ENOTSUPP; + } +} + +static struct gpio_chip template_chip = { + .label = "lp873x-gpio", + .owner = THIS_MODULE, + .request = lp873x_gpio_request, + .get_direction = lp873x_gpio_get_direction, + .direction_input = lp873x_gpio_direction_input, + .direction_output = lp873x_gpio_direction_output, + .get = lp873x_gpio_get, + .set = lp873x_gpio_set, + .set_single_ended = lp873x_gpio_set_single_ended, + .base = -1, + .ngpio = 2, + .can_sleep = true, +}; + +static int lp873x_gpio_probe(struct platform_device *pdev) +{ + struct lp873x_gpio *gpio; + int ret; + + gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL); + if (!gpio) + return -ENOMEM; + + platform_set_drvdata(pdev, gpio); + + gpio->lp873 = dev_get_drvdata(pdev->dev.parent); + gpio->chip = template_chip; + gpio->chip.parent = gpio->lp873->dev; + + ret = gpiochip_add_data(&gpio->chip, gpio); + if (ret < 0) { + dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret); + return ret; + } + + return 0; +} + +static int lp873x_gpio_remove(struct platform_device *pdev) +{ + struct lp873x_gpio *gpio = platform_get_drvdata(pdev); + + gpiochip_remove(&gpio->chip); + + return 0; +} + +static const struct platform_device_id lp873x_gpio_id_table[] = { + { "lp873x-gpio", }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(platform, lp873x_gpio_id_table); + +static struct platform_driver lp873x_gpio_driver = { + .driver = { + .name = "lp873x-gpio", + }, + .probe = lp873x_gpio_probe, + .remove = lp873x_gpio_remove, + .id_table = lp873x_gpio_id_table, +}; +module_platform_driver(lp873x_gpio_driver); + +MODULE_AUTHOR("Keerthy "); +MODULE_DESCRIPTION("LP873X GPIO driver"); +MODULE_LICENSE("GPL v2"); -- 1.9.1