diff options
Diffstat (limited to 'drivers/gpio')
| -rw-r--r-- | drivers/gpio/Kconfig | 7 | ||||
| -rw-r--r-- | drivers/gpio/Makefile | 1 | ||||
| -rw-r--r-- | drivers/gpio/gpio-mlxbf2.c | 335 | ||||
| -rw-r--r-- | drivers/gpio/gpio-mockup.c | 2 | ||||
| -rw-r--r-- | drivers/gpio/gpio-pxa.c | 4 | ||||
| -rw-r--r-- | drivers/gpio/gpio-rcar.c | 4 | ||||
| -rw-r--r-- | drivers/gpio/gpio-siox.c | 28 | ||||
| -rw-r--r-- | drivers/gpio/gpio-uniphier.c | 2 | ||||
| -rw-r--r-- | drivers/gpio/gpio-wcd934x.c | 9 | ||||
| -rw-r--r-- | drivers/gpio/gpiolib-of.c | 139 | ||||
| -rw-r--r-- | drivers/gpio/gpiolib-of.h | 2 | ||||
| -rw-r--r-- | drivers/gpio/gpiolib.c | 383 | ||||
| -rw-r--r-- | drivers/gpio/gpiolib.h | 4 |
13 files changed, 788 insertions, 132 deletions
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig index b8013cf90064..6234ccc90e7e 100644 --- a/drivers/gpio/Kconfig +++ b/drivers/gpio/Kconfig @@ -1399,6 +1399,13 @@ config GPIO_MLXBF help Say Y here if you want GPIO support on Mellanox BlueField SoC. +config GPIO_MLXBF2 + tristate "Mellanox BlueField 2 SoC GPIO" + depends on (MELLANOX_PLATFORM && ARM64 && ACPI) || (64BIT && COMPILE_TEST) + select GPIO_GENERIC + help + Say Y here if you want GPIO support on Mellanox BlueField 2 SoC. + config GPIO_ML_IOH tristate "OKI SEMICONDUCTOR ML7213 IOH GPIO support" depends on X86 || COMPILE_TEST diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile index 0b571264ddbc..b2cfc21a97f3 100644 --- a/drivers/gpio/Makefile +++ b/drivers/gpio/Makefile @@ -93,6 +93,7 @@ obj-$(CONFIG_GPIO_MENZ127) += gpio-menz127.o obj-$(CONFIG_GPIO_MERRIFIELD) += gpio-merrifield.o obj-$(CONFIG_GPIO_ML_IOH) += gpio-ml-ioh.o obj-$(CONFIG_GPIO_MLXBF) += gpio-mlxbf.o +obj-$(CONFIG_GPIO_MLXBF2) += gpio-mlxbf2.o obj-$(CONFIG_GPIO_MM_LANTIQ) += gpio-mm-lantiq.o obj-$(CONFIG_GPIO_MOCKUP) += gpio-mockup.o obj-$(CONFIG_GPIO_MOXTET) += gpio-moxtet.o diff --git a/drivers/gpio/gpio-mlxbf2.c b/drivers/gpio/gpio-mlxbf2.c new file mode 100644 index 000000000000..7b7085050219 --- /dev/null +++ b/drivers/gpio/gpio-mlxbf2.c @@ -0,0 +1,335 @@ +// SPDX-License-Identifier: GPL-2.0 + +#include <linux/acpi.h> +#include <linux/bitfield.h> +#include <linux/bitops.h> +#include <linux/device.h> +#include <linux/gpio/driver.h> +#include <linux/io.h> +#include <linux/ioport.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/pm.h> +#include <linux/resource.h> +#include <linux/spinlock.h> +#include <linux/types.h> +#include <linux/version.h> + +/* + * There are 3 YU GPIO blocks: + * gpio[0]: HOST_GPIO0->HOST_GPIO31 + * gpio[1]: HOST_GPIO32->HOST_GPIO63 + * gpio[2]: HOST_GPIO64->HOST_GPIO69 + */ +#define MLXBF2_GPIO_MAX_PINS_PER_BLOCK 32 + +/* + * arm_gpio_lock register: + * bit[31] lock status: active if set + * bit[15:0] set lock + * The lock is enabled only if 0xd42f is written to this field + */ +#define YU_ARM_GPIO_LOCK_ADDR 0x2801088 +#define YU_ARM_GPIO_LOCK_SIZE 0x8 +#define YU_LOCK_ACTIVE_BIT(val) (val >> 31) +#define YU_ARM_GPIO_LOCK_ACQUIRE 0xd42f +#define YU_ARM_GPIO_LOCK_RELEASE 0x0 + +/* + * gpio[x] block registers and their offset + */ +#define YU_GPIO_DATAIN 0x04 +#define YU_GPIO_MODE1 0x08 +#define YU_GPIO_MODE0 0x0c +#define YU_GPIO_DATASET 0x14 +#define YU_GPIO_DATACLEAR 0x18 +#define YU_GPIO_MODE1_CLEAR 0x50 +#define YU_GPIO_MODE0_SET 0x54 +#define YU_GPIO_MODE0_CLEAR 0x58 + +#ifdef CONFIG_PM +struct mlxbf2_gpio_context_save_regs { + u32 gpio_mode0; + u32 gpio_mode1; +}; +#endif + +/* BlueField-2 gpio block context structure. */ +struct mlxbf2_gpio_context { + struct gpio_chip gc; + + /* YU GPIO blocks address */ + void __iomem *gpio_io; + +#ifdef CONFIG_PM + struct mlxbf2_gpio_context_save_regs *csave_regs; +#endif +}; + +/* BlueField-2 gpio shared structure. */ +struct mlxbf2_gpio_param { + void __iomem *io; + struct resource *res; + struct mutex *lock; +}; + +static struct resource yu_arm_gpio_lock_res = { + .start = YU_ARM_GPIO_LOCK_ADDR, + .end = YU_ARM_GPIO_LOCK_ADDR + YU_ARM_GPIO_LOCK_SIZE - 1, + .name = "YU_ARM_GPIO_LOCK", +}; + +static DEFINE_MUTEX(yu_arm_gpio_lock_mutex); + +static struct mlxbf2_gpio_param yu_arm_gpio_lock_param = { + .res = &yu_arm_gpio_lock_res, + .lock = &yu_arm_gpio_lock_mutex, +}; + +/* Request memory region and map yu_arm_gpio_lock resource */ +static int mlxbf2_gpio_get_lock_res(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct resource *res; + resource_size_t size; + int ret = 0; + + mutex_lock(yu_arm_gpio_lock_param.lock); + + /* Check if the memory map already exists */ + if (yu_arm_gpio_lock_param.io) + goto exit; + + res = yu_arm_gpio_lock_param.res; + size = resource_size(res); + + if (!devm_request_mem_region(dev, res->start, size, res->name)) { + ret = -EFAULT; + goto exit; + } + + yu_arm_gpio_lock_param.io = devm_ioremap(dev, res->start, size); + if (IS_ERR(yu_arm_gpio_lock_param.io)) + ret = PTR_ERR(yu_arm_gpio_lock_param.io); + +exit: + mutex_unlock(yu_arm_gpio_lock_param.lock); + + return ret; +} + +/* + * Acquire the YU arm_gpio_lock to be able to change the direction + * mode. If the lock_active bit is already set, return an error. + */ +static int mlxbf2_gpio_lock_acquire(struct mlxbf2_gpio_context *gs) +{ + u32 arm_gpio_lock_val; + + spin_lock(&gs->gc.bgpio_lock); + mutex_lock(yu_arm_gpio_lock_param.lock); + + arm_gpio_lock_val = readl(yu_arm_gpio_lock_param.io); + + /* + * When lock active bit[31] is set, ModeX is write enabled + */ + if (YU_LOCK_ACTIVE_BIT(arm_gpio_lock_val)) { + mutex_unlock(yu_arm_gpio_lock_param.lock); + spin_unlock(&gs->gc.bgpio_lock); + return -EINVAL; + } + + writel(YU_ARM_GPIO_LOCK_ACQUIRE, yu_arm_gpio_lock_param.io); + + return 0; +} + +/* + * Release the YU arm_gpio_lock after changing the direction mode. + */ +static void mlxbf2_gpio_lock_release(struct mlxbf2_gpio_context *gs) +{ + writel(YU_ARM_GPIO_LOCK_RELEASE, yu_arm_gpio_lock_param.io); + mutex_unlock(yu_arm_gpio_lock_param.lock); + spin_unlock(&gs->gc.bgpio_lock); +} + +/* + * mode0 and mode1 are both locked by the gpio_lock field. + * + * Together, mode0 and mode1 define the gpio Mode dependeing also + * on Reg_DataOut. + * + * {mode1,mode0}:{Reg_DataOut=0,Reg_DataOut=1}->{DataOut=0,DataOut=1} + * + * {0,0}:Reg_DataOut{0,1}->{Z,Z} Input PAD + * {0,1}:Reg_DataOut{0,1}->{0,1} Full drive Output PAD + * {1,0}:Reg_DataOut{0,1}->{0,Z} 0-set PAD to low, 1-float + * {1,1}:Reg_DataOut{0,1}->{Z,1} 0-float, 1-set PAD to high + */ + +/* + * Set input direction: + * {mode1,mode0} = {0,0} + */ +static int mlxbf2_gpio_direction_input(struct gpio_chip *chip, + unsigned int offset) +{ + struct mlxbf2_gpio_context *gs = gpiochip_get_data(chip); + int ret; + + /* + * Although the arm_gpio_lock was set in the probe function, check again + * if it is still enabled to be able to write to the ModeX registers. + */ + ret = mlxbf2_gpio_lock_acquire(gs); + if (ret < 0) + return ret; + + writel(BIT(offset), gs->gpio_io + YU_GPIO_MODE0_CLEAR); + writel(BIT(offset), gs->gpio_io + YU_GPIO_MODE1_CLEAR); + + mlxbf2_gpio_lock_release(gs); + + return ret; +} + +/* + * Set output direction: + * {mode1,mode0} = {0,1} + */ +static int mlxbf2_gpio_direction_output(struct gpio_chip *chip, + unsigned int offset, + int value) +{ + struct mlxbf2_gpio_context *gs = gpiochip_get_data(chip); + int ret = 0; + + /* + * Although the arm_gpio_lock was set in the probe function, + * check again it is still enabled to be able to write to the + * ModeX registers. + */ + ret = mlxbf2_gpio_lock_acquire(gs); + if (ret < 0) + return ret; + + writel(BIT(offset), gs->gpio_io + YU_GPIO_MODE1_CLEAR); + writel(BIT(offset), gs->gpio_io + YU_GPIO_MODE0_SET); + + mlxbf2_gpio_lock_release(gs); + + return ret; +} + +/* BlueField-2 GPIO driver initialization routine. */ +static int +mlxbf2_gpio_probe(struct platform_device *pdev) +{ + struct mlxbf2_gpio_context *gs; + struct device *dev = &pdev->dev; + struct gpio_chip *gc; + struct resource *res; + unsigned int npins; + int ret; + + gs = devm_kzalloc(dev, sizeof(*gs), GFP_KERNEL); + if (!gs) + return -ENOMEM; + + /* YU GPIO block address */ + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) + return -ENODEV; + + gs->gpio_io = devm_ioremap(dev, res->start, resource_size(res)); + if (!gs->gpio_io) + return -ENOMEM; + + ret = mlxbf2_gpio_get_lock_res(pdev); + if (ret) { + dev_err(dev, "Failed to get yu_arm_gpio_lock resource\n"); + return ret; + } + + if (device_property_read_u32(dev, "npins", &npins)) + npins = MLXBF2_GPIO_MAX_PINS_PER_BLOCK; + + gc = &gs->gc; + + ret = bgpio_init(gc, dev, 4, + gs->gpio_io + YU_GPIO_DATAIN, + gs->gpio_io + YU_GPIO_DATASET, + gs->gpio_io + YU_GPIO_DATACLEAR, + NULL, + NULL, + 0); + + gc->direction_input = mlxbf2_gpio_direction_input; + gc->direction_output = mlxbf2_gpio_direction_output; + gc->ngpio = npins; + gc->owner = THIS_MODULE; + + platform_set_drvdata(pdev, gs); + + ret = devm_gpiochip_add_data(dev, &gs->gc, gs); + if (ret) { + dev_err(dev, "Failed adding memory mapped gpiochip\n"); + return ret; + } + + return 0; +} + +#ifdef CONFIG_PM +static int mlxbf2_gpio_suspend(struct platform_device *pdev, + pm_message_t state) +{ + struct mlxbf2_gpio_context *gs = platform_get_drvdata(pdev); + + gs->csave_regs->gpio_mode0 = readl(gs->gpio_io + + YU_GPIO_MODE0); + gs->csave_regs->gpio_mode1 = readl(gs->gpio_io + + YU_GPIO_MODE1); + + return 0; +} + +static int mlxbf2_gpio_resume(struct platform_device *pdev) +{ + struct mlxbf2_gpio_context *gs = platform_get_drvdata(pdev); + + writel(gs->csave_regs->gpio_mode0, gs->gpio_io + + YU_GPIO_MODE0); + writel(gs->csave_regs->gpio_mode1, gs->gpio_io + + YU_GPIO_MODE1); + + return 0; +} +#endif + +static const struct acpi_device_id mlxbf2_gpio_acpi_match[] = { + { "MLNXBF22", 0 }, + {}, +}; +MODULE_DEVICE_TABLE(acpi, mlxbf2_gpio_acpi_match); + +static struct platform_driver mlxbf2_gpio_driver = { + .driver = { + .name = "mlxbf2_gpio", + .acpi_match_table = ACPI_PTR(mlxbf2_gpio_acpi_match), + }, + .probe = mlxbf2_gpio_probe, +#ifdef CONFIG_PM + .suspend = mlxbf2_gpio_suspend, + .resume = mlxbf2_gpio_resume, +#endif +}; + +module_platform_driver(mlxbf2_gpio_driver); + +MODULE_DESCRIPTION("Mellanox BlueField-2 GPIO Driver"); +MODULE_AUTHOR("Mellanox Technologies"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/gpio/gpio-mockup.c b/drivers/gpio/gpio-mockup.c index 7d343bea784a..3eb94f3740d1 100644 --- a/drivers/gpio/gpio-mockup.c +++ b/drivers/gpio/gpio-mockup.c @@ -171,7 +171,7 @@ static int gpio_mockup_apply_pull(struct gpio_mockup_chip *chip, /* Change the value unless we're actively driving the line. */ if (!test_bit(FLAG_REQUESTED, &desc->flags) || - !test_bit(FLAG_IS_OUT, &desc->flags)) + !test_bit(FLAG_IS_OUT, &desc->flags)) __gpio_mockup_set(chip, offset, value); out: diff --git a/drivers/gpio/gpio-pxa.c b/drivers/gpio/gpio-pxa.c index 9888b62f37af..567742d962ae 100644 --- a/drivers/gpio/gpio-pxa.c +++ b/drivers/gpio/gpio-pxa.c @@ -652,8 +652,8 @@ static int pxa_gpio_probe(struct platform_device *pdev) if (!pchip->irqdomain) return -ENOMEM; - irq0 = platform_get_irq_byname(pdev, "gpio0"); - irq1 = platform_get_irq_byname(pdev, "gpio1"); + irq0 = platform_get_irq_byname_optional(pdev, "gpio0"); + irq1 = platform_get_irq_byname_optional(pdev, "gpio1"); irq_mux = platform_get_irq_byname(pdev, "gpio_mux"); if ((irq0 > 0 && irq1 <= 0) || (irq0 <= 0 && irq1 > 0) || (irq_mux <= 0)) diff --git a/drivers/gpio/gpio-rcar.c b/drivers/gpio/gpio-rcar.c index f800b250971c..7284473c9fe3 100644 --- a/drivers/gpio/gpio-rcar.c +++ b/drivers/gpio/gpio-rcar.c @@ -116,7 +116,7 @@ static void gpio_rcar_config_interrupt_input_mode(struct gpio_rcar_priv *p, spin_lock_irqsave(&p->lock, flags); - /* Configure postive or negative logic in POSNEG */ + /* Configure positive or negative logic in POSNEG */ gpio_rcar_modify_bit(p, POSNEG, hwirq, !active_high_rising_edge); /* Configure edge or level trigger in EDGLEVEL */ @@ -228,7 +228,7 @@ static void gpio_rcar_config_general_input_output_mode(struct gpio_chip *chip, spin_lock_irqsave(&p->lock, flags); - /* Configure postive logic in POSNEG */ + /* Configure positive logic in POSNEG */ gpio_rcar_modify_bit(p, POSNEG, gpio, false); /* Select "General Input/Output Mode" in IOINTSEL */ diff --git a/drivers/gpio/gpio-siox.c b/drivers/gpio/gpio-siox.c index 311f66757b92..26e1fe092304 100644 --- a/drivers/gpio/gpio-siox.c +++ b/drivers/gpio/gpio-siox.c @@ -15,7 +15,7 @@ struct gpio_siox_ddata { u8 setdata[1]; u8 getdata[3]; - spinlock_t irqlock; + raw_spinlock_t irqlock; u32 irq_enable; u32 irq_status; u32 irq_type[20]; @@ -44,7 +44,7 @@ static int gpio_siox_get_data(struct siox_device *sdevice, const u8 buf[]) mutex_lock(&ddata->lock); - spin_lock_irq(&ddata->irqlock); + raw_spin_lock_irq(&ddata->irqlock); for (offset = 0; offset < 12; ++offset) { unsigned int bitpos = 11 - offset; @@ -66,7 +66,7 @@ static int gpio_siox_get_data(struct siox_device *sdevice, const u8 buf[]) trigger = ddata->irq_status & ddata->irq_enable; - spin_unlock_irq(&ddata->irqlock); + raw_spin_unlock_irq(&ddata->irqlock); ddata->getdata[0] = buf[0]; ddata->getdata[1] = buf[1]; @@ -84,9 +84,9 @@ static int gpio_siox_get_data(struct siox_device *sdevice, const u8 buf[]) * handler of the irq chip. But it doesn't, so we have * to clean the irq_status here. */ - spin_lock_irq(&ddata->irqlock); + raw_spin_lock_irq(&ddata->irqlock); ddata->irq_status &= ~(1 << offset); - spin_unlock_irq(&ddata->irqlock); + raw_spin_unlock_irq(&ddata->irqlock); handle_nested_irq(irq); } @@ -101,9 +101,9 @@ static void gpio_siox_irq_ack(struct irq_data *d) struct gpio_siox_ddata *ddata = container_of(ic, struct gpio_siox_ddata, ichip); - spin_lock_irq(&ddata->irqlock); + raw_spin_lock(&ddata->irqlock); ddata->irq_status &= ~(1 << d->hwirq); - spin_unlock_irq(&ddata->irqlock); + raw_spin_unlock(&ddata->irqlock); } static void gpio_siox_irq_mask(struct irq_data *d) @@ -112,9 +112,9 @@ static void gpio_siox_irq_mask(struct irq_data *d) struct gpio_siox_ddata *ddata = container_of(ic, struct gpio_siox_ddata, ichip); - spin_lock_irq(&ddata->irqlock); + raw_spin_lock(&ddata->irqlock); ddata->irq_enable &= ~(1 << d->hwirq); - spin_unlock_irq(&ddata->irqlock); + raw_spin_unlock(&ddata->irqlock); } static void gpio_siox_irq_unmask(struct irq_data *d) @@ -123,9 +123,9 @@ static void gpio_siox_irq_unmask(struct irq_data *d) struct gpio_siox_ddata *ddata = container_of(ic, struct gpio_siox_ddata, ichip); - spin_lock_irq(&ddata->irqlock); + raw_spin_lock(&ddata->irqlock); ddata->irq_enable |= 1 << d->hwirq; - spin_unlock_irq(&ddata->irqlock); + raw_spin_unlock(&ddata->irqlock); } static int gpio_siox_irq_set_type(struct irq_data *d, u32 type) @@ -134,9 +134,9 @@ static int gpio_siox_irq_set_type(struct irq_data *d, u32 type) struct gpio_siox_ddata *ddata = container_of(ic, struct gpio_siox_ddata, ichip); - spin_lock_irq(&ddata->irqlock); + raw_spin_lock(&ddata->irqlock); ddata->irq_type[d->hwirq] = type; - spin_unlock_irq(&ddata->irqlock); + raw_spin_unlock(&ddata->irqlock); return 0; } @@ -222,7 +222,7 @@ static int gpio_siox_probe(struct siox_device *sdevice) dev_set_drvdata(dev, ddata); mutex_init(&ddata->lock); - spin_lock_init(&ddata->irqlock); + raw_spin_lock_init(&ddata->irqlock); ddata->gchip.base = -1; ddata->gchip.can_sleep = 1; diff --git a/drivers/gpio/gpio-uniphier.c b/drivers/gpio/gpio-uniphier.c index 7ec97499b7f7..f99f3c10bed0 100644 --- a/drivers/gpio/gpio-uniphier.c +++ b/drivers/gpio/gpio-uniphier.c @@ -30,7 +30,7 @@ struct uniphier_gpio_priv { struct irq_domain *domain; void __iomem *regs; spinlock_t lock; - u32 saved_vals[0]; + u32 saved_vals[]; }; static unsigned int uniphier_gpio_bank_to_reg(unsigned int bank) diff --git a/drivers/gpio/gpio-wcd934x.c b/drivers/gpio/gpio-wcd934x.c index 74913f2e5697..1cbce5990855 100644 --- a/drivers/gpio/gpio-wcd934x.c +++ b/drivers/gpio/gpio-wcd934x.c @@ -57,16 +57,19 @@ static int wcd_gpio_direction_output(struct gpio_chip *chip, unsigned int pin, static int wcd_gpio_get(struct gpio_chip *chip, unsigned int pin) { struct wcd_gpio_data *data = gpiochip_get_data(chip); - int value; + unsigned int value; regmap_read(data->map, WCD_REG_VAL_CTL_OFFSET, &value); - return !!(value && WCD_PIN_MASK(pin)); + return !!(value & WCD_PIN_MASK(pin)); } static void wcd_gpio_set(struct gpio_chip *chip, unsigned int pin, int val) { - wcd_gpio_direction_output(chip, pin, val); + struct wcd_gpio_data *data = gpiochip_get_data(chip); + + regmap_update_bits(data->map, WCD_REG_VAL_CTL_OFFSET, + WCD_PIN_MASK(pin), val ? WCD_PIN_MASK(pin) : 0); } static int wcd_gpio_probe(struct platform_device *pdev) diff --git a/drivers/gpio/gpiolib-of.c b/drivers/gpio/gpiolib-of.c index c6d30f73df07..ccc449df3792 100644 --- a/drivers/gpio/gpiolib-of.c +++ b/drivers/gpio/gpiolib-of.c @@ -605,6 +605,39 @@ static struct gpio_desc *of_parse_own_gpio(struct device_node *np, } /** + * of_gpiochip_add_hog - Add all hogs in a hog device node + * @chip: gpio chip to act on + * @hog: device node describing the hogs + * + * Returns error if it fails otherwise 0 on success. + */ +static int of_gpiochip_add_hog(struct gpio_chip *chip, struct device_node *hog) +{ + enum gpiod_flags dflags; + struct gpio_desc *desc; + unsigned long lflags; + const char *name; + unsigned int i; + int ret; + + for (i = 0;; i++) { + desc = of_parse_own_gpio(hog, chip, i, &name, &lflags, &dflags); + if (IS_ERR(desc)) + break; + + ret = gpiod_hog(desc, name, lflags, dflags); + if (ret < 0) + return ret; + +#ifdef CONFIG_OF_DYNAMIC + desc->hog = hog; +#endif + } + + return 0; +} + +/** * of_gpiochip_scan_gpios - Scan gpio-controller for gpio definitions * @chip: gpio chip to act on * @@ -614,35 +647,109 @@ static struct gpio_desc *of_parse_own_gpio(struct device_node *np, */ static int of_gpiochip_scan_gpios(struct gpio_chip *chip) { - struct gpio_desc *desc = NULL; struct device_node *np; - const char *name; - unsigned long lflags; - enum gpiod_flags dflags; - unsigned int i; int ret; for_each_available_child_of_node(chip->of_node, np) { if (!of_property_read_bool(np, "gpio-hog")) continue; - for (i = 0;; i++) { - desc = of_parse_own_gpio(np, chip, i, &name, &lflags, - &dflags); - if (IS_ERR(desc)) - break; - - ret = gpiod_hog(desc, name, lflags, dflags); - if (ret < 0) { - of_node_put(np); - return ret; - } + ret = of_gpiochip_add_hog(chip, np); + if (ret < 0) { + of_node_put(np); + return ret; } + + of_node_set_flag(np, OF_POPULATED); } return 0; } +#ifdef CONFIG_OF_DYNAMIC +/** + * of_gpiochip_remove_hog - Remove all hogs in a hog device node + * @chip: gpio chip to act on + * @hog: device node describing the hogs + */ +static void of_gpiochip_remove_hog(struct gpio_chip *chip, + struct device_node *hog) +{ + struct gpio_desc *descs = chip->gpiodev->descs; + unsigned int i; + + for (i = 0; i < chip->ngpio; i++) { + if (test_bit(FLAG_IS_HOGGED, &descs[i].flags) && + descs[i].hog == hog) + gpiochip_free_own_desc(&descs[i]); + } +} + +static int of_gpiochip_match_node(struct gpio_chip *chip, void *data) +{ + return chip->gpiodev->dev.of_node == data; +} + +static struct gpio_chip *of_find_gpiochip_by_node(struct device_node *np) +{ + return gpiochip_find(np, of_gpiochip_match_node); +} + +static int of_gpio_notify(struct notifier_block *nb, unsigned long action, + void *arg) +{ + struct of_reconfig_data *rd = arg; + struct gpio_chip *chip; + int ret; + + /* + * This only supports adding and removing complete gpio-hog nodes. + * Modifying an existing gpio-hog node is not supported (except for + * changing its "status" property, which is treated the same as + * addition/removal). + */ + switch (of_reconfig_get_state_change(action, arg)) { + case OF_RECONFIG_CHANGE_ADD: + if (!of_property_read_bool(rd->dn, "gpio-hog")) + return NOTIFY_OK; /* not for us */ + + if (of_node_test_and_set_flag(rd->dn, OF_POPULATED)) + return NOTIFY_OK; + + chip = of_find_gpiochip_by_node(rd->dn->parent); + if (chip == NULL) + return NOTIFY_OK; /* not for us */ + + ret = of_gpiochip_add_hog(chip, rd->dn); + if (ret < 0) { + pr_err("%s: failed to add hogs for %pOF\n", __func__, + rd->dn); + of_node_clear_flag(rd->dn, OF_POPULATED); + return notifier_from_errno(ret); + } + break; + + case OF_RECONFIG_CHANGE_REMOVE: + if (!of_node_check_flag(rd->dn, OF_POPULATED)) + return NOTIFY_OK; /* already depopulated */ + + chip = of_find_gpiochip_by_node(rd->dn->parent); + if (chip == NULL) + return NOTIFY_OK; /* not for us */ + + of_gpiochip_remove_hog(chip, rd->dn); + of_node_clear_flag(rd->dn, OF_POPULATED); + break; + } + + return NOTIFY_OK; +} + +struct notifier_block gpio_of_notifier = { + .notifier_call = of_gpio_notify, +}; +#endif /* CONFIG_OF_DYNAMIC */ + /** * of_gpio_simple_xlate - translate gpiospec to the GPIO number and flags * @gc: pointer to the gpio_chip structure diff --git a/drivers/gpio/gpiolib-of.h b/drivers/gpio/gpiolib-of.h index 9768831b1fe2..ed26664f1537 100644 --- a/drivers/gpio/gpiolib-of.h +++ b/drivers/gpio/gpiolib-of.h @@ -35,4 +35,6 @@ static inline bool of_gpio_need_valid_mask(const struct gpio_chip *gc) } #endif /* CONFIG_OF_GPIO */ +extern struct notifier_block gpio_of_notifier; + #endif /* GPIOLIB_OF_H */ diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c index 753283486037..02f8b2b81199 100644 --- a/drivers/gpio/gpiolib.c +++ b/drivers/gpio/gpiolib.c @@ -546,6 +546,9 @@ static long linehandle_set_config(struct linehandle_state *lh, if (ret) return ret; } + + atomic_notifier_call_chain(&desc->gdev->notifier, + GPIOLINE_CHANGED_CONFIG, desc); } return 0; } @@ -787,8 +790,6 @@ out_free_lh: * @irq: the interrupt that trigger in response to events on this GPIO * @wait: wait queue that handles blocking reads of events * @events: KFIFO for the GPIO events - * @read_lock: mutex lock to protect reads from colliding with adding - * new events to the FIFO * @timestamp: cache for the timestamp storing it between hardirq * and IRQ thread, used to bring the timestamp close to the actual * event @@ -801,7 +802,6 @@ struct lineevent_state { int irq; wait_queue_head_t wait; DECLARE_KFIFO(events, struct gpioevent_data, 16); - struct mutex read_lock; u64 timestamp; }; @@ -817,7 +817,7 @@ static __poll_t lineevent_poll(struct file *filep, poll_wait(filep, &le->wait, wait); - if (!kfifo_is_empty(&le->events)) + if (!kfifo_is_empty_spinlocked_noirqsave(&le->events, &le->wait.lock)) events = EPOLLIN | EPOLLRDNORM; return events; @@ -830,43 +830,52 @@ static ssize_t lineevent_read(struct file *filep, loff_t *f_ps) { struct lineevent_state *le = filep->private_data; - unsigned int copied; + struct gpioevent_data ge; + ssize_t bytes_read = 0; int ret; - if (count < sizeof(struct gpioevent_data)) + if (count < sizeof(ge)) return -EINVAL; do { + spin_lock(&le->wait.lock); if (kfifo_is_empty(&le->events)) { - if (filep->f_flags & O_NONBLOCK) + if (bytes_read) { + spin_unlock(&le->wait.lock); + return bytes_read; + } + + if (filep->f_flags & O_NONBLOCK) { + spin_unlock(&le->wait.lock); return -EAGAIN; + } - ret = wait_event_interruptible(le->wait, + ret = wait_event_interruptible_locked(le->wait, !kfifo_is_empty(&le->events)); - if (ret) + if (ret) { + spin_unlock(&le->wait.lock); return ret; + } } - if (mutex_lock_interruptible(&le->read_lock)) - return -ERESTARTSYS; - ret = kfifo_to_user(&le->events, buf, count, &copied); - mutex_unlock(&le->read_lock); - - if (ret) - return ret; - - /* - * If we couldn't read anything from the fifo (a different - * thread might have been faster) we either return -EAGAIN if - * the file descriptor is non-blocking, otherwise we go back to - * sleep and wait for more data to arrive. - */ - if (copied == 0 && (filep->f_flags & O_NONBLOCK)) - return -EAGAIN; + ret = kfifo_out(&le->events, &ge, 1); + spin_unlock(&le->wait.lock); + if (ret != 1) { + /* + * This should never happen - we were holding the lock + * from the moment we learned the fifo is no longer + * empty until now. + */ + ret = -EIO; + break; + } - } while (copied == 0); + if (copy_to_user(buf + bytes_read, &ge, sizeof(ge))) + return -EFAULT; + bytes_read += sizeof(ge); + } while (count >= bytes_read + sizeof(ge)); - return copied; + return bytes_read; } static int lineevent_release(struct inode *inode, struct file *filep) @@ -945,7 +954,7 @@ static irqreturn_t lineevent_irq_thread(int irq, void *p) * we didn't get the timestamp from lineevent_irq_handler(). */ if (!le->timestamp) - ge.timestamp = ktime_get_real_ns(); + ge.timestamp = ktime_get_ns(); else ge.timestamp = le->timestamp; @@ -968,9 +977,12 @@ static irqreturn_t lineevent_irq_thread(int irq, void *p) return IRQ_NONE; } - ret = kfifo_put(&le->events, ge); + ret = kfifo_in_spinlocked_noirqsave(&le->events, &ge, + 1, &le->wait.lock); if (ret) wake_up_poll(&le->wait, EPOLLIN); + else + pr_debug_ratelimited("event FIFO is full - event dropped\n"); return IRQ_HANDLED; } @@ -983,7 +995,7 @@ static irqreturn_t lineevent_irq_handler(int irq, void *p) * Just store the timestamp in hardirq context so we get it as * close in time as possible to the actual event. */ - le->timestamp = ktime_get_real_ns(); + le->timestamp = ktime_get_ns(); return IRQ_WAKE_THREAD; } @@ -1083,7 +1095,6 @@ static int lineevent_create(struct gpio_device *gdev, void __user *ip) INIT_KFIFO(le->events); init_waitqueue_head(&le->wait); - mutex_init(&le->read_lock); /* Request a thread to read the events */ ret = request_threaded_irq(le->irq, @@ -1139,14 +1150,79 @@ out_free_le: return ret; } +static void gpio_desc_to_lineinfo(struct gpio_desc *desc, + struct gpioline_info *info) +{ + struct gpio_chip *chip = desc->gdev->chip; + unsigned long flags; + + spin_lock_irqsave(&gpio_lock, flags); + + if (desc->name) { + strncpy(info->name, desc->name, sizeof(info->name)); + info->name[sizeof(info->name) - 1] = '\0'; + } else { + info->name[0] = '\0'; + } + + if (desc->label) { + strncpy(info->consumer, desc->label, sizeof(info->consumer)); + info->consumer[sizeof(info->consumer) - 1] = '\0'; + } else { + info->consumer[0] = '\0'; + } + + /* + * Userspace only need to know that the kernel is using this GPIO so + * it can't use it. + */ + info->flags = 0; + if (test_bit(FLAG_REQUESTED, &desc->flags) || + test_bit(FLAG_IS_HOGGED, &desc->flags) || + test_bit(FLAG_USED_AS_IRQ, &desc->flags) || + test_bit(FLAG_EXPORT, &desc->flags) || + test_bit(FLAG_SYSFS, &desc->flags) || + !pinctrl_gpio_can_use_line(chip->base + info->line_offset)) + info->flags |= GPIOLINE_FLAG_KERNEL; + if (test_bit(FLAG_IS_OUT, &desc->flags)) + info->flags |= GPIOLINE_FLAG_IS_OUT; + if (test_bit(FLAG_ACTIVE_LOW, &desc->flags)) + info->flags |= GPIOLINE_FLAG_ACTIVE_LOW; + if (test_bit(FLAG_OPEN_DRAIN, &desc->flags)) + info->flags |= (GPIOLINE_FLAG_OPEN_DRAIN | + GPIOLINE_FLAG_IS_OUT); + if (test_bit(FLAG_OPEN_SOURCE, &desc->flags)) + info->flags |= (GPIOLINE_FLAG_OPEN_SOURCE | + GPIOLINE_FLAG_IS_OUT); + if (test_bit(FLAG_BIAS_DISABLE, &desc->flags)) + info->flags |= GPIOLINE_FLAG_BIAS_DISABLE; + if (test_bit(FLAG_PULL_DOWN, &desc->flags)) + info->flags |= GPIOLINE_FLAG_BIAS_PULL_DOWN; + if (test_bit(FLAG_PULL_UP, &desc->flags)) + info->flags |= GPIOLINE_FLAG_BIAS_PULL_UP; + + spin_unlock_irqrestore(&gpio_lock, flags); +} + +struct gpio_chardev_data { + struct gpio_device *gdev; + wait_queue_head_t wait; + DECLARE_KFIFO(events, struct gpioline_info_changed, 32); + struct notifier_block lineinfo_changed_nb; + unsigned long *watched_lines; +}; + /* * gpio_ioctl() - ioctl handler for the GPIO chardev */ static long gpio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) { - struct gpio_device *gdev = filp->private_data; + struct gpio_chardev_data *priv = filp->private_data; + struct gpio_device *gdev = priv->gdev; struct gpio_chip *chip = gdev->chip; void __user *ip = (void __user *)arg; + struct gpio_desc *desc; + __u32 offset; /* We fail any subsequent ioctl():s when the chip is gone */ if (!chip) @@ -1168,9 +1244,9 @@ static long gpio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) if (copy_to_user(ip, &chipinfo, sizeof(chipinfo))) return -EFAULT; return 0; - } else if (cmd == GPIO_GET_LINEINFO_IOCTL) { + } else if (cmd == GPIO_GET_LINEINFO_IOCTL || + cmd == GPIO_GET_LINEINFO_WATCH_IOCTL) { struct gpioline_info lineinfo; - struct gpio_desc *desc; if (copy_from_user(&lineinfo, ip, sizeof(lineinfo))) return -EFAULT; @@ -1179,57 +1255,29 @@ static long gpio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) if (IS_ERR(desc)) return PTR_ERR(desc); - if (desc->name) { - strncpy(lineinfo.name, desc->name, - sizeof(lineinfo.name)); - lineinfo.name[sizeof(lineinfo.name)-1] = '\0'; - } else { - lineinfo.name[0] = '\0'; - } - if (desc->label) { - strncpy(lineinfo.consumer, desc->label, - sizeof(lineinfo.consumer)); - lineinfo.consumer[sizeof(lineinfo.consumer)-1] = '\0'; - } else { - lineinfo.consumer[0] = '\0'; - } - - /* - * Userspace only need to know that the kernel is using - * this GPIO so it can't use it. - */ - lineinfo.flags = 0; - if (test_bit(FLAG_REQUESTED, &desc->flags) || - test_bit(FLAG_IS_HOGGED, &desc->flags) || - test_bit(FLAG_USED_AS_IRQ, &desc->flags) || - test_bit(FLAG_EXPORT, &desc->flags) || - test_bit(FLAG_SYSFS, &desc->flags) || - !pinctrl_gpio_can_use_line(chip->base + lineinfo.line_offset)) - lineinfo.flags |= GPIOLINE_FLAG_KERNEL; - if (test_bit(FLAG_IS_OUT, &desc->flags)) - lineinfo.flags |= GPIOLINE_FLAG_IS_OUT; - if (test_bit(FLAG_ACTIVE_LOW, &desc->flags)) - lineinfo.flags |= GPIOLINE_FLAG_ACTIVE_LOW; - if (test_bit(FLAG_OPEN_DRAIN, &desc->flags)) - lineinfo.flags |= (GPIOLINE_FLAG_OPEN_DRAIN | - GPIOLINE_FLAG_IS_OUT); - if (test_bit(FLAG_OPEN_SOURCE, &desc->flags)) - lineinfo.flags |= (GPIOLINE_FLAG_OPEN_SOURCE | - GPIOLINE_FLAG_IS_OUT); - if (test_bit(FLAG_BIAS_DISABLE, &desc->flags)) - lineinfo.flags |= GPIOLINE_FLAG_BIAS_DISABLE; - if (test_bit(FLAG_PULL_DOWN, &desc->flags)) - lineinfo.flags |= GPIOLINE_FLAG_BIAS_PULL_DOWN; - if (test_bit(FLAG_PULL_UP, &desc->flags)) - lineinfo.flags |= GPIOLINE_FLAG_BIAS_PULL_UP; + gpio_desc_to_lineinfo(desc, &lineinfo); if (copy_to_user(ip, &lineinfo, sizeof(lineinfo))) return -EFAULT; + + if (cmd == GPIO_GET_LINEINFO_WATCH_IOCTL) + set_bit(gpio_chip_hwgpio(desc), priv->watched_lines); + return 0; } else if (cmd == GPIO_GET_LINEHANDLE_IOCTL) { return linehandle_create(gdev, ip); } else if (cmd == GPIO_GET_LINEEVENT_IOCTL) { return lineevent_create(gdev, ip); + } else if (cmd == GPIO_GET_LINEINFO_UNWATCH_IOCTL) { + if (copy_from_user(&offset, ip, sizeof(offset))) + return -EFAULT; + + desc = gpiochip_get_desc(chip, offset); + if (IS_ERR(desc)) + return PTR_ERR(desc); + + clear_bit(gpio_chip_hwgpio(desc), priv->watched_lines); + return 0; } return -EINVAL; } @@ -1242,6 +1290,101 @@ static long gpio_ioctl_compat(struct file *filp, unsigned int cmd, } #endif +static struct gpio_chardev_data * +to_gpio_chardev_data(struct notifier_block *nb) +{ + return container_of(nb, struct gpio_chardev_data, lineinfo_changed_nb); +} + +static int lineinfo_changed_notify(struct notifier_block *nb, + unsigned long action, void *data) +{ + struct gpio_chardev_data *priv = to_gpio_chardev_data(nb); + struct gpioline_info_changed chg; + struct gpio_desc *desc = data; + int ret; + + if (!test_bit(gpio_chip_hwgpio(desc), priv->watched_lines)) + return NOTIFY_DONE; + + memset(&chg, 0, sizeof(chg)); + chg.info.line_offset = gpio_chip_hwgpio(desc); + chg.event_type = action; + chg.timestamp = ktime_get_ns(); + gpio_desc_to_lineinfo(desc, &chg.info); + + ret = kfifo_in_spinlocked(&priv->events, &chg, 1, &priv->wait.lock); + if (ret) + wake_up_poll(&priv->wait, EPOLLIN); + else + pr_debug_ratelimited("lineinfo event FIFO is full - event dropped\n"); + + return NOTIFY_OK; +} + +static __poll_t lineinfo_watch_poll(struct file *filep, + struct poll_table_struct *pollt) +{ + struct gpio_chardev_data *priv = filep->private_data; + __poll_t events = 0; + + poll_wait(filep, &priv->wait, pollt); + + if (!kfifo_is_empty_spinlocked_noirqsave(&priv->events, + &priv->wait.lock)) + events = EPOLLIN | EPOLLRDNORM; + + return events; +} + +static ssize_t lineinfo_watch_read(struct file *filep, char __user *buf, + size_t count, loff_t *off) +{ + struct gpio_chardev_data *priv = filep->private_data; + struct gpioline_info_changed event; + ssize_t bytes_read = 0; + int ret; + + if (count < sizeof(event)) + return -EINVAL; + + do { + spin_lock(&priv->wait.lock); + if (kfifo_is_empty(&priv->events)) { + if (bytes_read) { + spin_unlock(&priv->wait.lock); + return bytes_read; + } + + if (filep->f_flags & O_NONBLOCK) { + spin_unlock(&priv->wait.lock); + return -EAGAIN; + } + + ret = wait_event_interruptible_locked(priv->wait, + !kfifo_is_empty(&priv->events)); + if (ret) { + spin_unlock(&priv->wait.lock); + return ret; + } + } + + ret = kfifo_out(&priv->events, &event, 1); + spin_unlock(&priv->wait.lock); + if (ret != 1) { + ret = -EIO; + break; + /* We should never get here. See lineevent_read(). */ + } + + if (copy_to_user(buf + bytes_read, &event, sizeof(event))) + return -EFAULT; + bytes_read += sizeof(event); + } while (count >= bytes_read + sizeof(event)); + + return bytes_read; +} + /** * gpio_chrdev_open() - open the chardev for ioctl operations * @inode: inode for this chardev @@ -1252,14 +1395,48 @@ static int gpio_chrdev_open(struct inode *inode, struct file *filp) { struct gpio_device *gdev = container_of(inode->i_cdev, struct gpio_device, chrdev); + struct gpio_chardev_data *priv; + int ret = -ENOMEM; /* Fail on open if the backing gpiochip is gone */ if (!gdev->chip) return -ENODEV; + + priv = kzalloc(sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + priv->watched_lines = bitmap_zalloc(gdev->chip->ngpio, GFP_KERNEL); + if (!priv->watched_lines) + goto out_free_priv; + + init_waitqueue_head(&priv->wait); + INIT_KFIFO(priv->events); + priv->gdev = gdev; + + priv->lineinfo_changed_nb.notifier_call = lineinfo_changed_notify; + ret = atomic_notifier_chain_register(&gdev->notifier, + &priv->lineinfo_changed_nb); + if (ret) + goto out_free_bitmap; + get_device(&gdev->dev); - filp->private_data = gdev; + filp->private_data = priv; + + ret = nonseekable_open(inode, filp); + if (ret) + goto out_unregister_notifier; - return nonseekable_open(inode, filp); + return ret; + +out_unregister_notifier: + atomic_notifier_chain_unregister(&gdev->notifier, + &priv->lineinfo_changed_nb); +out_free_bitmap: + bitmap_free(priv->watched_lines); +out_free_priv: + kfree(priv); + return ret; } /** @@ -1270,17 +1447,23 @@ static int gpio_chrdev_open(struct inode *inode, struct file *filp) */ static int gpio_chrdev_release(struct inode *inode, struct file *filp) { - struct gpio_device *gdev = container_of(inode->i_cdev, - struct gpio_device, chrdev); + struct gpio_chardev_data *priv = filp->private_data; + struct gpio_device *gdev = priv->gdev; + bitmap_free(priv->watched_lines); + atomic_notifier_chain_unregister(&gdev->notifier, + &priv->lineinfo_changed_nb); put_device(&gdev->dev); + kfree(priv); + return 0; } - static const struct file_operations gpio_fileops = { .release = gpio_chrdev_release, .open = gpio_chrdev_open, + .poll = lineinfo_watch_poll, + .read = lineinfo_watch_read, .owner = THIS_MODULE, .llseek = no_llseek, .unlocked_ioctl = gpio_ioctl, @@ -1491,6 +1674,8 @@ int gpiochip_add_data_with_key(struct gpio_chip *chip, void *data, spin_unlock_irqrestore(&gpio_lock, flags); + ATOMIC_INIT_NOTIFIER_HEAD(&gdev->notifier); + #ifdef CONFIG_PINCTRL INIT_LIST_HEAD(&gdev->pin_ranges); #endif @@ -1612,10 +1797,8 @@ EXPORT_SYMBOL_GPL(gpiochip_get_data); void gpiochip_remove(struct gpio_chip *chip) { struct gpio_device *gdev = chip->gpiodev; - struct gpio_desc *desc; unsigned long flags; - unsigned i; - bool requested = false; + unsigned int i; /* FIXME: should the legacy sysfs handling be moved to gpio_device? */ gpiochip_sysfs_unregister(gdev); @@ -1635,13 +1818,12 @@ void gpiochip_remove(struct gpio_chip *chip) spin_lock_irqsave(&gpio_lock, flags); for (i = 0; i < gdev->ngpio; i++) { - desc = &gdev->descs[i]; - if (test_bit(FLAG_REQUESTED, &desc->flags)) - requested = true; + if (gpiochip_is_requested(chip, i)) + break; } spin_unlock_irqrestore(&gpio_lock, flags); - if (requested) + if (i != gdev->ngpio) dev_crit(&gdev->dev, "REMOVING GPIOCHIP WITH GPIOS STILL REQUESTED\n"); @@ -2823,6 +3005,8 @@ static int gpiod_request_commit(struct gpio_desc *desc, const char *label) } done: spin_unlock_irqrestore(&gpio_lock, flags); + atomic_notifier_call_chain(&desc->gdev->notifier, + GPIOLINE_CHANGED_REQUESTED, desc); return ret; } @@ -2916,10 +3100,16 @@ static bool gpiod_free_commit(struct gpio_desc *desc) clear_bit(FLAG_PULL_DOWN, &desc->flags); clear_bit(FLAG_BIAS_DISABLE, &desc->flags); clear_bit(FLAG_IS_HOGGED, &desc->flags); +#ifdef CONFIG_OF_DYNAMIC + desc->hog = NULL; +#endif ret = true; } spin_unlock_irqrestore(&gpio_lock, flags); + atomic_notifier_call_chain(&desc->gdev->notifier, + GPIOLINE_CHANGED_RELEASED, desc); + return ret; } @@ -2953,7 +3143,9 @@ const char *gpiochip_is_requested(struct gpio_chip *chip, unsigned offset) if (offset >= chip->ngpio) return NULL; - desc = &chip->gpiodev->descs[offset]; + desc = gpiochip_get_desc(chip, offset); + if (IS_ERR(desc)) + return NULL; if (test_bit(FLAG_REQUESTED, &desc->flags) == 0) return NULL; @@ -5089,10 +5281,15 @@ static int __init gpiolib_dev_init(void) if (ret < 0) { pr_err("gpiolib: failed to allocate char dev region\n"); bus_unregister(&gpio_bus_type); - } else { - gpiolib_initialized = true; - gpiochip_setup_devs(); + return ret; } + + gpiolib_initialized = true; + gpiochip_setup_devs(); + + if (IS_ENABLED(CONFIG_OF_DYNAMIC)) + WARN_ON(of_reconfig_notifier_register(&gpio_of_notifier)); + return ret; } core_initcall(gpiolib_dev_init); diff --git a/drivers/gpio/gpiolib.h b/drivers/gpio/gpiolib.h index 3e0aab2945d8..853ce681b4a4 100644 --- a/drivers/gpio/gpiolib.h +++ b/drivers/gpio/gpiolib.h @@ -56,6 +56,7 @@ struct gpio_device { const char *label; void *data; struct list_head list; + struct atomic_notifier_head notifier; #ifdef CONFIG_PINCTRL /* @@ -119,6 +120,9 @@ struct gpio_desc { const char *label; /* Name of the GPIO */ const char *name; +#ifdef CONFIG_OF_DYNAMIC + struct device_node *hog; +#endif }; int gpiod_request(struct gpio_desc *desc, const char *label); |