From: Thor Thayer <tthayer@xxxxxxxxxxxxxxxxxxxxx> 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@xxxxxxxxxxxxxxxxxxxxx> --- drivers/gpio/Kconfig | 8 ++ drivers/gpio/Makefile | 1 + drivers/gpio/gpio-altera-a10sr.c | 158 ++++++++++++++++++++++++++++++++++++++ drivers/mfd/altera-a10sr.c | 4 + include/linux/mfd/altera-a10sr.h | 22 ++++++ 5 files changed, 193 insertions(+) create mode 100644 drivers/gpio/gpio-altera-a10sr.c diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig index 5f3429f..7ea2d8f 100644 --- a/drivers/gpio/Kconfig +++ b/drivers/gpio/Kconfig @@ -767,6 +767,14 @@ 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 diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile index 1e0b74f..cc29464 100644 --- a/drivers/gpio/Makefile +++ b/drivers/gpio/Makefile @@ -21,6 +21,7 @@ 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 diff --git a/drivers/gpio/gpio-altera-a10sr.c b/drivers/gpio/gpio-altera-a10sr.c new file mode 100644 index 0000000..be5308b --- /dev/null +++ b/drivers/gpio/gpio-altera-a10sr.c @@ -0,0 +1,158 @@ +/* + * Copyright Altera 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-da9052.c + * Copyright(c) 2011 Dialog Semiconductor Ltd. + * Author: David Dajun Chen <dchen@xxxxxxxxxxx> + */ + +#include <linux/fs.h> +#include <linux/gpio.h> +#include <linux/mfd/altera-a10sr.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/seq_file.h> +#include <linux/syscalls.h> +#include <linux/uaccess.h> + +struct altr_a10sr_gpio { + struct altr_a10sr *a10sc; + struct gpio_chip gp; +}; + +static inline struct altr_a10sr_gpio *to_altr_a10sr_gpio(struct gpio_chip *chip) +{ + return container_of(chip, struct altr_a10sr_gpio, gp); +} + +static int altr_a10sr_gpio_get(struct gpio_chip *gc, unsigned int nr) +{ + struct altr_a10sr_gpio *gpio = to_altr_a10sr_gpio(gc); + int ret; + unsigned char reg = ALTR_A10SR_LED_RD_REG + ALTR_A10SR_REG_OFFSET(nr); + + ret = altr_a10sr_reg_read(gpio->a10sc, reg); + + if (ret < 0) + return ret; + + if (ret & (1 << ALTR_A10SR_REG_BIT(nr))) + return 1; + + return 0; +} + +static void altr_a10sr_gpio_set(struct gpio_chip *gc, unsigned int nr, + int value) +{ + struct altr_a10sr_gpio *gpio = to_altr_a10sr_gpio(gc); + int ret; + unsigned char reg = ALTR_A10SR_LED_WR_REG + ALTR_A10SR_REG_OFFSET(nr); + + ret = altr_a10sr_reg_update(gpio->a10sc, reg, + ALTR_A10SR_REG_BIT_MASK(nr), + ALTR_A10SR_REG_BIT_CHG(value, nr)); + if (ret != 0) + dev_err(gpio->a10sc->dev, + "Failed to update gpio reg : %d", ret); +} + +static int altr_a10sr_gpio_direction_input(struct gpio_chip *gc, + unsigned int nr) +{ + if ((nr >= ALTR_A10SR_IN_VALID_RANGE_LO) && + (nr <= ALTR_A10SR_IN_VALID_RANGE_HI)) + 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_LO) && + (nr <= ALTR_A10SR_OUT_VALID_RANGE_HI)) + 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 = 16, + .base = -1, +}; + +static int altr_a10sr_gpio_probe(struct platform_device *pdev) +{ + struct altr_a10sr_gpio *gpio; + int ret; + + gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL); + if (!gpio) + return -ENOMEM; + + gpio->a10sc = dev_get_drvdata(pdev->dev.parent); + + gpio->gp = altr_a10sr_gc; + + gpio->gp.of_node = pdev->dev.of_node; + + ret = gpiochip_add(&gpio->gp); + 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 = altr_a10sr_gpio_of_match, + }, +}; + +module_platform_driver(altr_a10sr_gpio_driver); + +MODULE_LICENSE("GPL v2"); +MODULE_AUTHOR("Thor Thayer"); +MODULE_DESCRIPTION("Altera Arria10 System Resource Chip GPIO"); diff --git a/drivers/mfd/altera-a10sr.c b/drivers/mfd/altera-a10sr.c index 13665d4..517b895 100644 --- a/drivers/mfd/altera-a10sr.c +++ b/drivers/mfd/altera-a10sr.c @@ -30,6 +30,10 @@ #include <linux/spi/spi.h> static const struct mfd_cell altr_a10sr_subdev_info[] = { + { + .name = "altr_a10sr_gpio", + .of_compatible = "altr,a10sr-gpio", + }, }; static bool altr_a10sr_reg_readable(struct device *dev, unsigned int reg) diff --git a/include/linux/mfd/altera-a10sr.h b/include/linux/mfd/altera-a10sr.h index 7087afc..6d254a1 100644 --- a/include/linux/mfd/altera-a10sr.h +++ b/include/linux/mfd/altera-a10sr.h @@ -50,9 +50,31 @@ #define ALTR_A10SR_VERSION_READ 0x01 /* MAX5 Version Read */ #define ALTR_A10SR_LED_WR_REG 0x02 /* LED - Upper 4 bits */ #define ALTR_A10SR_LED_RD_REG 0x03 /* LED - Upper 4 bits */ +/* LED register Bit Definitions */ +#define ALTR_A10SR_LED_MASK 0xF0 /* LED - Mask Upper 4 bits */ +#define ALTR_A10SR_LED_VALID_SHIFT 4 /* LED - Upper 4 bits valid */ +#define ALTR_A10SR_LED_VALID_NUM 4 /* LED - # valid LEDs */ +#define ALTR_A10SR_OUT_VALID_RANGE_LO ALTR_A10SR_LED_VALID_SHIFT +#define ALTR_A10SR_OUT_VALID_RANGE_HI 7 + #define ALTR_A10SR_PBDSW_RD_REG 0x05 /* PB & DIP SW - Input only */ #define ALTR_A10SR_PBDSW_IRQ_CLR_REG 0x06 /* PB & DIP SW Flag Clear */ #define ALTR_A10SR_PBDSW_IRQ_RD_REG 0x07 /* PB & DIP SW Flag Read */ +/* Pushbutton & DIP Switch Bit Definitions */ +#define ALTR_A10SR_PB_DWS_PB_MASK 0xF0 /* PB - Upper 4 bits */ +#define ALTR_A10SR_PB_DWS_DWS_MASK 0x0F /* DWS - Lower 4 bits */ +#define ALTR_A10SR_PB_VALID_NUM 4 /* # valid PB */ +#define ALTR_A10SR_IRQ_PB_3_SHIFT 7 /* Pushbutton 4 */ +#define ALTR_A10SR_IRQ_PB_2_SHIFT 6 /* Pushbutton 3 */ +#define ALTR_A10SR_IRQ_PB_1_SHIFT 5 /* Pushbutton 2 */ +#define ALTR_A10SR_IRQ_PB_0_SHIFT 4 /* Pushbutton 1 */ +#define ALTR_A10SR_IRQ_DSW_3_SHIFT 3 /* DIP SW 3 */ +#define ALTR_A10SR_IRQ_DSW_2_SHIFT 2 /* DIP SW 2 */ +#define ALTR_A10SR_IRQ_DSW_1_SHIFT 1 /* DIP SW 1 */ +#define ALTR_A10SR_IRQ_DSW_O_SHIFT 0 /* DIP SW 0 */ +#define ALTR_A10SR_IN_VALID_RANGE_LO 8 +#define ALTR_A10SR_IN_VALID_RANGE_HI 15 + #define ALTR_A10SR_PWR_GOOD1_RD_REG 0x09 /* Power Good1 Read */ #define ALTR_A10SR_PWR_GOOD2_RD_REG 0x0B /* Power Good2 Read */ #define ALTR_A10SR_PWR_GOOD3_RD_REG 0x0D /* Power Good3 Read */ -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
