From patchwork Sat Jan 30 16:38:49 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Laxman Dewangan X-Patchwork-Id: 576053 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 4F3EF140BED for ; Sun, 31 Jan 2016 03:51:43 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932971AbcA3Quv (ORCPT ); Sat, 30 Jan 2016 11:50:51 -0500 Received: from hqemgate16.nvidia.com ([216.228.121.65]:11078 "EHLO hqemgate16.nvidia.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932126AbcA3Qus (ORCPT ); Sat, 30 Jan 2016 11:50:48 -0500 Received: from hqnvupgp08.nvidia.com (Not Verified[216.228.121.13]) by hqemgate16.nvidia.com id ; Sat, 30 Jan 2016 08:50:55 -0800 Received: from hqemhub03.nvidia.com ([172.20.150.15]) by hqnvupgp08.nvidia.com (PGP Universal service); Sat, 30 Jan 2016 08:51:37 -0800 X-PGP-Universal: processed; by hqnvupgp08.nvidia.com on Sat, 30 Jan 2016 08:51:37 -0800 Received: from ldewanganubuntu-System-Product-Name.nvidia.com (172.20.144.16) by hqemhub03.nvidia.com (172.20.150.15) with Microsoft SMTP Server (TLS) id 8.3.406.0; Sat, 30 Jan 2016 08:50:47 -0800 From: Laxman Dewangan To: , , , , , , , , , , CC: , , , , , , , , , Laxman Dewangan Subject: [PATCH V7 6/8] gpio: max77620: add gpio driver for MAX77620/MAX20024 Date: Sat, 30 Jan 2016 22:08:49 +0530 Message-ID: <1454171931-27752-7-git-send-email-ldewangan@nvidia.com> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1454171931-27752-1-git-send-email-ldewangan@nvidia.com> References: <1454171931-27752-1-git-send-email-ldewangan@nvidia.com> MIME-Version: 1.0 Sender: linux-gpio-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org MAXIM Semiconductor's PMIC, MAX77620/MAX20024 has 8 GPIO pins. It also supports interrupts from these pins. Add GPIO driver for these pins to control via GPIO APIs. Signed-off-by: Laxman Dewangan Reviewed-by: Linus Walleij --- drivers/gpio/Kconfig | 9 ++ drivers/gpio/Makefile | 1 + drivers/gpio/gpio-max77620.c | 263 +++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 273 insertions(+) create mode 100644 drivers/gpio/gpio-max77620.c diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig index c88dd24..48c614e 100644 --- a/drivers/gpio/Kconfig +++ b/drivers/gpio/Kconfig @@ -797,6 +797,15 @@ 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_MAX77620 + bool "GPIO support for PMIC MAX77620 and MAX20024" + depends on MFD_MAX77620 + help + GPIO driver for MAX77620 and MAX20024 PMIC from Maxim Semiconductor. + MAX77620 PMIC has 8 pins that can be configured as GPIOs. The + driver also provides interrupt support for each of the gpios. + Say yes here to enable the max77620 to be used as gpio controller. + config GPIO_MSIC bool "Intel MSIC mixed signal gpio support" depends on MFD_INTEL_MSIC diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile index ece7d7c..f676a2d 100644 --- a/drivers/gpio/Makefile +++ b/drivers/gpio/Makefile @@ -57,6 +57,7 @@ obj-$(CONFIG_GPIO_MAX730X) += gpio-max730x.o obj-$(CONFIG_GPIO_MAX7300) += gpio-max7300.o obj-$(CONFIG_GPIO_MAX7301) += gpio-max7301.o obj-$(CONFIG_GPIO_MAX732X) += gpio-max732x.o +obj-$(CONFIG_GPIO_MAX77620) += gpio-max77620.o obj-$(CONFIG_GPIO_MB86S7X) += gpio-mb86s7x.o obj-$(CONFIG_GPIO_MC33880) += gpio-mc33880.o obj-$(CONFIG_GPIO_MC9S08DZ60) += gpio-mc9s08dz60.o diff --git a/drivers/gpio/gpio-max77620.c b/drivers/gpio/gpio-max77620.c new file mode 100644 index 0000000..54fe5ff --- /dev/null +++ b/drivers/gpio/gpio-max77620.c @@ -0,0 +1,263 @@ +/* + * MAXIM MAX77620 GPIO driver + * + * Copyright (c) 2016, NVIDIA CORPORATION. All rights reserved. + * + * 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. + */ + +#include +#include +#include +#include +#include +#include + +#define GPIO_REG_ADDR(offset) (MAX77620_REG_GPIO0 + offset) + +struct max77620_gpio { + struct gpio_chip gpio_chip; + struct regmap *rmap; + struct device *dev; + int gpio_irq; + int irq_base; + int gpio_base; +}; + +static const struct regmap_irq max77620_gpio_irqs[] = { + REGMAP_IRQ_REG(0, 0, MAX77620_IRQ_LVL2_GPIO_EDGE0), + REGMAP_IRQ_REG(1, 0, MAX77620_IRQ_LVL2_GPIO_EDGE1), + REGMAP_IRQ_REG(2, 0, MAX77620_IRQ_LVL2_GPIO_EDGE2), + REGMAP_IRQ_REG(3, 0, MAX77620_IRQ_LVL2_GPIO_EDGE3), + REGMAP_IRQ_REG(4, 0, MAX77620_IRQ_LVL2_GPIO_EDGE4), + REGMAP_IRQ_REG(5, 0, MAX77620_IRQ_LVL2_GPIO_EDGE5), + REGMAP_IRQ_REG(6, 0, MAX77620_IRQ_LVL2_GPIO_EDGE6), + REGMAP_IRQ_REG(7, 0, MAX77620_IRQ_LVL2_GPIO_EDGE7), +}; + +static struct regmap_irq_chip max77620_gpio_irq_chip = { + .name = "max77620-gpio", + .irqs = max77620_gpio_irqs, + .num_irqs = ARRAY_SIZE(max77620_gpio_irqs), + .num_regs = 1, + .irq_reg_stride = 1, + .status_base = MAX77620_REG_IRQ_LVL2_GPIO, +}; + +static int max77620_gpio_dir_input(struct gpio_chip *gc, unsigned offset) +{ + struct max77620_gpio *mgpio = gpiochip_get_data(gc); + int ret; + + ret = regmap_update_bits(mgpio->rmap, GPIO_REG_ADDR(offset), + MAX77620_CNFG_GPIO_DIR_MASK, + MAX77620_CNFG_GPIO_DIR_INPUT); + if (ret < 0) + dev_err(mgpio->dev, "CNFG_GPIOx dir update failed: %d\n", ret); + + return ret; +} + +static int max77620_gpio_get(struct gpio_chip *gc, unsigned offset) +{ + struct max77620_gpio *mgpio = gpiochip_get_data(gc); + unsigned int val; + int ret; + + ret = regmap_read(mgpio->rmap, GPIO_REG_ADDR(offset), &val); + if (ret < 0) { + dev_err(mgpio->dev, "CNFG_GPIOx read failed: %d\n", ret); + return ret; + } + + return !!(val & MAX77620_CNFG_GPIO_INPUT_VAL_MASK); +} + +static int max77620_gpio_dir_output(struct gpio_chip *gc, unsigned offset, + int value) +{ + struct max77620_gpio *mgpio = gpiochip_get_data(gc); + u8 val; + int ret; + + val = (value) ? MAX77620_CNFG_GPIO_OUTPUT_VAL_HIGH : + MAX77620_CNFG_GPIO_OUTPUT_VAL_LOW; + + ret = regmap_update_bits(mgpio->rmap, GPIO_REG_ADDR(offset), + MAX77620_CNFG_GPIO_OUTPUT_VAL_MASK, val); + if (ret < 0) { + dev_err(mgpio->dev, "CNFG_GPIOx val update failed: %d\n", ret); + return ret; + } + + ret = regmap_update_bits(mgpio->rmap, GPIO_REG_ADDR(offset), + MAX77620_CNFG_GPIO_DIR_MASK, + MAX77620_CNFG_GPIO_DIR_OUTPUT); + if (ret < 0) + dev_err(mgpio->dev, "CNFG_GPIOx dir update failed: %d\n", ret); + + return ret; +} + +static int max77620_gpio_set_debounce(struct gpio_chip *gc, + unsigned offset, unsigned debounce) +{ + struct max77620_gpio *mgpio = gpiochip_get_data(gc); + u8 val; + int ret; + + switch (debounce) { + case 0: + val = MAX77620_CNFG_GPIO_DBNC_None; + break; + case 1 ... 8: + val = MAX77620_CNFG_GPIO_DBNC_8ms; + break; + case 9 ... 16: + val = MAX77620_CNFG_GPIO_DBNC_16ms; + break; + case 17 ... 32: + val = MAX77620_CNFG_GPIO_DBNC_32ms; + break; + default: + dev_err(mgpio->dev, "Illegal value %u\n", debounce); + return -EINVAL; + } + + ret = regmap_update_bits(mgpio->rmap, GPIO_REG_ADDR(offset), + MAX77620_CNFG_GPIO_DBNC_MASK, val); + if (ret < 0) + dev_err(mgpio->dev, "CNFG_GPIOx_DBNC update failed: %d\n", ret); + + return ret; +} + +static void max77620_gpio_set(struct gpio_chip *gc, unsigned offset, + int value) +{ + struct max77620_gpio *mgpio = gpiochip_get_data(gc); + u8 val; + int ret; + + val = (value) ? MAX77620_CNFG_GPIO_OUTPUT_VAL_HIGH : + MAX77620_CNFG_GPIO_OUTPUT_VAL_LOW; + + ret = regmap_update_bits(mgpio->rmap, GPIO_REG_ADDR(offset), + MAX77620_CNFG_GPIO_OUTPUT_VAL_MASK, val); + if (ret < 0) + dev_err(mgpio->dev, "CNFG_GPIO_OUT update failed: %d\n", ret); +} + +static int max77620_gpio_to_irq(struct gpio_chip *gc, unsigned offset) +{ + struct max77620_gpio *mgpio = gpiochip_get_data(gc); + struct max77620_chip *chip = dev_get_drvdata(mgpio->dev->parent); + + return regmap_irq_get_virq(chip->gpio_irq_data, offset); +} + +static void max77620_gpio_irq_remove(struct max77620_gpio *mgpio) +{ + struct max77620_chip *chip = dev_get_drvdata(mgpio->dev->parent); + + regmap_del_irq_chip(mgpio->gpio_irq, chip->gpio_irq_data); + chip->gpio_irq_data = NULL; +} + +static int max77620_gpio_probe(struct platform_device *pdev) +{ + struct max77620_chip *chip = dev_get_drvdata(pdev->dev.parent); + struct max77620_gpio *mgpio; + int gpio_irq; + int ret; + + gpio_irq = platform_get_irq(pdev, 0); + if (gpio_irq <= 0) { + dev_err(&pdev->dev, "GPIO irq not available %d\n", gpio_irq); + return -ENODEV; + } + + mgpio = devm_kzalloc(&pdev->dev, sizeof(*mgpio), GFP_KERNEL); + if (!mgpio) + return -ENOMEM; + + mgpio->rmap = chip->rmap; + mgpio->dev = &pdev->dev; + mgpio->gpio_irq = gpio_irq; + + mgpio->gpio_chip.label = pdev->name; + mgpio->gpio_chip.parent = &pdev->dev; + mgpio->gpio_chip.direction_input = max77620_gpio_dir_input; + mgpio->gpio_chip.get = max77620_gpio_get; + mgpio->gpio_chip.direction_output = max77620_gpio_dir_output; + mgpio->gpio_chip.set_debounce = max77620_gpio_set_debounce; + mgpio->gpio_chip.set = max77620_gpio_set; + mgpio->gpio_chip.to_irq = max77620_gpio_to_irq; + mgpio->gpio_chip.ngpio = MAX77620_GPIO_NR; + mgpio->gpio_chip.can_sleep = 1; + mgpio->gpio_chip.base = -1; + mgpio->irq_base = -1; +#ifdef CONFIG_OF_GPIO + mgpio->gpio_chip.of_node = pdev->dev.parent->of_node; +#endif + + platform_set_drvdata(pdev, mgpio); + + ret = gpiochip_add_data(&mgpio->gpio_chip, mgpio); + if (ret < 0) { + dev_err(&pdev->dev, "gpio_init: Failed to add max77620_gpio\n"); + return ret; + } + mgpio->gpio_base = mgpio->gpio_chip.base; + + ret = regmap_add_irq_chip(chip->rmap, mgpio->gpio_irq, IRQF_ONESHOT, + mgpio->irq_base, + &max77620_gpio_irq_chip, + &chip->gpio_irq_data); + if (ret < 0) { + dev_err(&pdev->dev, "Failed to add gpio irq_chip %d\n", ret); + goto fail; + } + + return 0; + +fail: + gpiochip_remove(&mgpio->gpio_chip); + + return ret; +} + +static int max77620_gpio_remove(struct platform_device *pdev) +{ + struct max77620_gpio *mgpio = platform_get_drvdata(pdev); + + max77620_gpio_irq_remove(mgpio); + gpiochip_remove(&mgpio->gpio_chip); + + return 0; +} + +static const struct platform_device_id max77620_gpio_devtype[] = { + { .name = "max77620-gpio", }, + { .name = "max20024-gpio", }, + {}, +}; +MODULE_DEVICE_TABLE(platform, max77620_gpio_devtype); + +static struct platform_driver max77620_gpio_driver = { + .driver.name = "max77620-gpio", + .driver.owner = THIS_MODULE, + .probe = max77620_gpio_probe, + .remove = max77620_gpio_remove, + .id_table = max77620_gpio_devtype, +}; + +module_platform_driver(max77620_gpio_driver); + +MODULE_DESCRIPTION("GPIO interface for MAX77620 and MAX20024 PMIC"); +MODULE_AUTHOR("Laxman Dewangan "); +MODULE_AUTHOR("Chaitanya Bandi "); +MODULE_ALIAS("platform:max77620-gpio"); +MODULE_LICENSE("GPL v2");