| From 26b18f6bff88d437c9949a2251c5bc62de427311 Mon Sep 17 00:00:00 2001 |
| From: Thor Thayer <tthayer@opensource.altera.com> |
| Date: Thu, 2 Jun 2016 12:52:24 -0500 |
| Subject: [PATCH 071/103] gpio: altera-a10sr: Add A10 System Resource Chip GPIO |
| support. |
| |
| Add the GPIO functionality for the Altera Arria10 MAX5 System Resource |
| Chip. The A10 MAX5 has 12 bits of GPIO assigned to switches, buttons, |
| and LEDs as a GPIO extender on the SPI bus. |
| |
| Signed-off-by: Thor Thayer <tthayer@opensource.altera.com> |
| Acked-by: Linus Walleij <linus.walleij@linaro.org>i |
| Signed-off-by: Linus Walleij <linus.walleij@linaro.org> |
| --- |
| drivers/gpio/Kconfig | 8 ++ |
| drivers/gpio/Makefile | 1 |
| drivers/gpio/gpio-altera-a10sr.c | 140 +++++++++++++++++++++++++++++++++++++++ |
| 3 files changed, 149 insertions(+) |
| create mode 100644 drivers/gpio/gpio-altera-a10sr.c |
| |
| --- a/drivers/gpio/Kconfig |
| +++ b/drivers/gpio/Kconfig |
| @@ -814,6 +814,14 @@ config GPIO_ADP5520 |
| This option enables support for on-chip GPIO found |
| on Analog Devices ADP5520 PMICs. |
| |
| +config GPIO_ALTERA_A10SR |
| + tristate "Altera Arria10 System Resource GPIO" |
| + depends on MFD_ALTERA_A10SR |
| + help |
| + Driver for Arria10 Development Kit GPIO expansion which |
| + includes reads of pushbuttons and DIP switches as well |
| + as writes to LEDs. |
| + |
| config GPIO_ARIZONA |
| tristate "Wolfson Microelectronics Arizona class devices" |
| depends on MFD_ARIZONA |
| --- a/drivers/gpio/Makefile |
| +++ b/drivers/gpio/Makefile |
| @@ -24,6 +24,7 @@ obj-$(CONFIG_GPIO_ADNP) += gpio-adnp.o |
| obj-$(CONFIG_GPIO_ADP5520) += gpio-adp5520.o |
| obj-$(CONFIG_GPIO_ADP5588) += gpio-adp5588.o |
| obj-$(CONFIG_GPIO_ALTERA) += gpio-altera.o |
| +obj-$(CONFIG_GPIO_ALTERA_A10SR) += gpio-altera-a10sr.o |
| obj-$(CONFIG_GPIO_AMD8111) += gpio-amd8111.o |
| obj-$(CONFIG_GPIO_AMDPT) += gpio-amdpt.o |
| obj-$(CONFIG_GPIO_ARIZONA) += gpio-arizona.o |
| --- /dev/null |
| +++ b/drivers/gpio/gpio-altera-a10sr.c |
| @@ -0,0 +1,140 @@ |
| +/* |
| + * Copyright Intel Corporation (C) 2014-2016. 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. |
| + * |
| + * 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 <http://www.gnu.org/licenses/>. |
| + * |
| + * GPIO driver for Altera Arria10 MAX5 System Resource Chip |
| + * |
| + * Adapted from gpio-tps65910.c |
| + */ |
| + |
| +#include <linux/gpio/driver.h> |
| +#include <linux/mfd/altera-a10sr.h> |
| +#include <linux/module.h> |
| + |
| +/** |
| + * struct altr_a10sr_gpio - Altera Max5 GPIO device private data structure |
| + * @gp: : instance of the gpio_chip |
| + * @regmap: the regmap from the parent device. |
| + */ |
| +struct altr_a10sr_gpio { |
| + struct gpio_chip gp; |
| + struct regmap *regmap; |
| +}; |
| + |
| +static int altr_a10sr_gpio_get(struct gpio_chip *chip, unsigned int offset) |
| +{ |
| + struct altr_a10sr_gpio *gpio = gpiochip_get_data(chip); |
| + int ret, val; |
| + |
| + ret = regmap_read(gpio->regmap, ALTR_A10SR_PBDSW_REG, &val); |
| + if (ret < 0) |
| + return ret; |
| + |
| + return !!(val & BIT(offset - ALTR_A10SR_LED_VALID_SHIFT)); |
| +} |
| + |
| +static void altr_a10sr_gpio_set(struct gpio_chip *chip, unsigned int offset, |
| + int value) |
| +{ |
| + struct altr_a10sr_gpio *gpio = gpiochip_get_data(chip); |
| + |
| + regmap_update_bits(gpio->regmap, ALTR_A10SR_LED_REG, |
| + BIT(ALTR_A10SR_LED_VALID_SHIFT + offset), |
| + value ? BIT(ALTR_A10SR_LED_VALID_SHIFT + offset) |
| + : 0); |
| +} |
| + |
| +static int altr_a10sr_gpio_direction_input(struct gpio_chip *gc, |
| + unsigned int nr) |
| +{ |
| + if (nr >= (ALTR_A10SR_IN_VALID_RANGE_LO - ALTR_A10SR_LED_VALID_SHIFT)) |
| + return 0; |
| + return -EINVAL; |
| +} |
| + |
| +static int altr_a10sr_gpio_direction_output(struct gpio_chip *gc, |
| + unsigned int nr, int value) |
| +{ |
| + if (nr <= (ALTR_A10SR_OUT_VALID_RANGE_HI - ALTR_A10SR_LED_VALID_SHIFT)) |
| + return 0; |
| + return -EINVAL; |
| +} |
| + |
| +static struct gpio_chip altr_a10sr_gc = { |
| + .label = "altr_a10sr_gpio", |
| + .owner = THIS_MODULE, |
| + .get = altr_a10sr_gpio_get, |
| + .set = altr_a10sr_gpio_set, |
| + .direction_input = altr_a10sr_gpio_direction_input, |
| + .direction_output = altr_a10sr_gpio_direction_output, |
| + .can_sleep = true, |
| + .ngpio = 12, |
| + .base = -1, |
| +}; |
| + |
| +static int altr_a10sr_gpio_probe(struct platform_device *pdev) |
| +{ |
| + struct altr_a10sr_gpio *gpio; |
| + int ret; |
| + struct altr_a10sr *a10sr = dev_get_drvdata(pdev->dev.parent); |
| + |
| + gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL); |
| + if (!gpio) |
| + return -ENOMEM; |
| + |
| + gpio->regmap = a10sr->regmap; |
| + |
| + gpio->gp = altr_a10sr_gc; |
| + |
| + gpio->gp.of_node = pdev->dev.of_node; |
| + |
| + ret = devm_gpiochip_add_data(&pdev->dev, &gpio->gp, gpio); |
| + if (ret < 0) { |
| + dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret); |
| + return ret; |
| + } |
| + |
| + platform_set_drvdata(pdev, gpio); |
| + |
| + return 0; |
| +} |
| + |
| +static int altr_a10sr_gpio_remove(struct platform_device *pdev) |
| +{ |
| + struct altr_a10sr_gpio *gpio = platform_get_drvdata(pdev); |
| + |
| + gpiochip_remove(&gpio->gp); |
| + |
| + return 0; |
| +} |
| + |
| +static const struct of_device_id altr_a10sr_gpio_of_match[] = { |
| + { .compatible = "altr,a10sr-gpio" }, |
| + { }, |
| +}; |
| +MODULE_DEVICE_TABLE(of, altr_a10sr_gpio_of_match); |
| + |
| +static struct platform_driver altr_a10sr_gpio_driver = { |
| + .probe = altr_a10sr_gpio_probe, |
| + .remove = altr_a10sr_gpio_remove, |
| + .driver = { |
| + .name = "altr_a10sr_gpio", |
| + .of_match_table = of_match_ptr(altr_a10sr_gpio_of_match), |
| + }, |
| +}; |
| +module_platform_driver(altr_a10sr_gpio_driver); |
| + |
| +MODULE_LICENSE("GPL v2"); |
| +MODULE_AUTHOR("Thor Thayer <tthayer@opensource.altera.com>"); |
| +MODULE_DESCRIPTION("Altera Arria10 System Resource Chip GPIO"); |