| Message ID | 20240517-a2b-v1-6-b8647554c67b@bang-olufsen.dk (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | Analog Devices Inc. Automotive Audio Bus (A2B) support | expand |
On Fri, May 17, 2024 at 2:58 PM Alvin Šipraga <alvin@pqrs.dk> wrote: > > From: Alvin Šipraga <alsi@bang-olufsen.dk> > > This driver adds GPIO function support for AD24xx A2B transceiver chips. > When a GPIO is requested, the relevant pin is automatically muxed to > GPIO mode. The device tree property gpio-reserved-ranges can be used to > protect certain pins which are reserved for other functionality such as > I2S/TDM data. > > Signed-off-by: Alvin Šipraga <alsi@bang-olufsen.dk> > --- > drivers/a2b/Kconfig | 1 + > drivers/gpio/Kconfig | 6 + > drivers/gpio/Makefile | 1 + > drivers/gpio/gpio-ad24xx.c | 302 +++++++++++++++++++++++++++++++++++++++++++++ > 4 files changed, 310 insertions(+) > > diff --git a/drivers/a2b/Kconfig b/drivers/a2b/Kconfig > index 1f6d836463f3..8c894579e2fc 100644 > --- a/drivers/a2b/Kconfig > +++ b/drivers/a2b/Kconfig > @@ -32,6 +32,7 @@ config A2B_AD24XX_I2C > config A2B_AD24XX_NODE > tristate "Analog Devices Inc. AD24xx node support" > select REGMAP_A2B > + imply GPIO_AD24XX > help > Say Y here to enable support for AD24xx A2B transceiver nodes. This > applies to both main nodes and subordinate nodes. Supported models > diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig > index 3dbddec07028..72bd0d88d6b3 100644 > --- a/drivers/gpio/Kconfig > +++ b/drivers/gpio/Kconfig > @@ -1241,6 +1241,12 @@ config GPIO_ALTERA_A10SR > includes reads of pushbuttons and DIP switches as well > as writes to LEDs. > > +config GPIO_AD24XX > + tristate "Analog Devies Inc. AD24xx GPIO support" > + depends on A2B_AD24XX_NODE > + help > + Say Y here to enable GPIO support for AD24xx A2B transceivers. > + > config GPIO_ARIZONA > tristate "Wolfson Microelectronics Arizona class devices" > depends on MFD_ARIZONA > diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile > index e2a53013780e..f625bb140143 100644 > --- a/drivers/gpio/Makefile > +++ b/drivers/gpio/Makefile > @@ -24,6 +24,7 @@ obj-$(CONFIG_GPIO_104_IDI_48) += gpio-104-idi-48.o > obj-$(CONFIG_GPIO_104_IDIO_16) += gpio-104-idio-16.o > obj-$(CONFIG_GPIO_74X164) += gpio-74x164.o > obj-$(CONFIG_GPIO_74XX_MMIO) += gpio-74xx-mmio.o > +obj-$(CONFIG_GPIO_AD24XX) += gpio-ad24xx.o > obj-$(CONFIG_GPIO_ADNP) += gpio-adnp.o > obj-$(CONFIG_GPIO_ADP5520) += gpio-adp5520.o > obj-$(CONFIG_GPIO_AGGREGATOR) += gpio-aggregator.o > diff --git a/drivers/gpio/gpio-ad24xx.c b/drivers/gpio/gpio-ad24xx.c > new file mode 100644 > index 000000000000..097ea9e2d629 > --- /dev/null > +++ b/drivers/gpio/gpio-ad24xx.c > @@ -0,0 +1,302 @@ > +// SPDX-License-Identifier: GPL-2.0-only > +/* > + * AD24xx GPIO driver > + * > + * Copyright (c) 2023-2024 Alvin Šipraga <alsi@bang-olufsen.dk> > + */ > + > +#include <linux/a2b/a2b.h> > +#include <linux/a2b/ad24xx.h> > +#include <linux/gpio/driver.h> > +#include <linux/interrupt.h> > +#include <linux/module.h> > +#include <linux/of_irq.h> > +#include <linux/regmap.h> > + > +struct ad24xx_gpio { > + struct device *dev; You only use this once to emit a log message. You should probably drop it and use the parent pointer in gpio_chip. Otherwise looks pretty good to me. With the above addressed: Acked-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org> Bart > + struct a2b_func *func; > + struct a2b_node *node; > + struct regmap *regmap; > + int irqs[AD24XX_MAX_GPIOS]; > + struct gpio_chip gpio_chip; > + struct irq_chip irq_chip; > + struct mutex mutex; > + unsigned int irq_invert : AD24XX_MAX_GPIOS; > + unsigned int irq_enable : AD24XX_MAX_GPIOS; > +}; > + > +static int ad24xx_gpio_get_direction(struct gpio_chip *gc, unsigned int offset) > +{ > + struct ad24xx_gpio *adg = gpiochip_get_data(gc); > + unsigned int val; > + int ret; > + > + ret = regmap_read(adg->regmap, A2B_GPIOOEN, &val); > + if (ret) > + return ret; > + > + if (val & BIT(offset)) > + return 0; /* output */ > + > + return 1; /* input */ > +} > + > +static int ad24xx_gpio_get(struct gpio_chip *gc, unsigned int offset) > +{ > + struct ad24xx_gpio *adg = gpiochip_get_data(gc); > + unsigned int val; > + int ret; > + > + ret = regmap_read(adg->regmap, A2B_GPIOIN, &val); > + if (ret) > + return ret; > + > + if (val & BIT(offset)) > + return 1; /* high */ > + > + return 0; /* low */ > +} > + > +static void ad24xx_gpio_set(struct gpio_chip *gc, unsigned int offset, > + int value) > +{ > + struct ad24xx_gpio *adg = gpiochip_get_data(gc); > + unsigned int reg = value ? A2B_GPIODATSET : A2B_GPIODATCLR; > + > + regmap_write(adg->regmap, reg, BIT(offset)); > +} > + > +static int ad24xx_gpio_set_direction(struct ad24xx_gpio *adg, > + unsigned int offset, > + unsigned int direction) > +{ > + unsigned int mask = BIT(offset); > + unsigned int ival = direction ? BIT(offset) : 0; > + int ret; > + > + ret = regmap_update_bits(adg->regmap, A2B_GPIOIEN, mask, ival); > + if (ret) > + return ret; > + > + ret = regmap_update_bits(adg->regmap, A2B_GPIOOEN, mask, ~ival); > + if (ret) > + return ret; > + > + return 0; > +} > + > +static int ad24xx_gpio_direction_input(struct gpio_chip *gc, > + unsigned int offset) > +{ > + struct ad24xx_gpio *adg = gpiochip_get_data(gc); > + > + return ad24xx_gpio_set_direction(adg, offset, 1); > +} > + > +static int ad24xx_gpio_direction_output(struct gpio_chip *gc, > + unsigned int offset, int value) > +{ > + struct ad24xx_gpio *adg = gpiochip_get_data(gc); > + > + /* For atomicity, write the output value before setting the direction */ > + ad24xx_gpio_set(gc, offset, value); > + > + return ad24xx_gpio_set_direction(adg, offset, 0); > +} > + > +static int ad24xx_gpio_child_to_parent_hwirq(struct gpio_chip *gc, > + unsigned int child, > + unsigned int child_type, > + unsigned int *parent, > + unsigned int *parent_type) > +{ > + *parent = child; > + return 0; > +} > + > +static void ad24xx_gpio_irq_mask(struct irq_data *d) > +{ > + struct gpio_chip *gpio_chip = irq_data_get_irq_chip_data(d); > + struct ad24xx_gpio *adg = gpiochip_get_data(gpio_chip); > + irq_hw_number_t hwirq = irqd_to_hwirq(d); > + > + adg->irq_enable &= ~BIT(hwirq); > + gpiochip_disable_irq(gpio_chip, hwirq); > +} > + > +static void ad24xx_gpio_irq_unmask(struct irq_data *d) > +{ > + struct gpio_chip *gpio_chip = irq_data_get_irq_chip_data(d); > + struct ad24xx_gpio *adg = gpiochip_get_data(gpio_chip); > + irq_hw_number_t hwirq = irqd_to_hwirq(d); > + > + gpiochip_disable_irq(gpio_chip, hwirq); > + adg->irq_enable |= BIT(hwirq); > +} > + > +static int ad24xx_gpio_irq_set_type(struct irq_data *d, unsigned int type) > +{ > + struct gpio_chip *gpio_chip = irq_data_get_irq_chip_data(d); > + struct ad24xx_gpio *adg = gpiochip_get_data(gpio_chip); > + irq_hw_number_t hwirq = irqd_to_hwirq(d); > + > + switch (type) { > + case IRQ_TYPE_EDGE_RISING: > + adg->irq_invert &= ~BIT(hwirq); > + break; > + case IRQ_TYPE_EDGE_FALLING: > + adg->irq_invert |= BIT(hwirq); > + break; > + default: > + return -EINVAL; > + } > + > + return 0; > +} > + > +static void ad24xx_gpio_irq_bus_lock(struct irq_data *d) > +{ > + struct gpio_chip *gpio_chip = irq_data_get_irq_chip_data(d); > + struct ad24xx_gpio *adg = gpiochip_get_data(gpio_chip); > + > + mutex_lock(&adg->mutex); > +} > + > +static void ad24xx_gpio_irq_bus_sync_unlock(struct irq_data *d) > +{ > + struct gpio_chip *gpio_chip = irq_data_get_irq_chip_data(d); > + struct ad24xx_gpio *adg = gpiochip_get_data(gpio_chip); > + int ret; > + > + ret = regmap_write(adg->regmap, A2B_PINTINV, adg->irq_invert); > + if (ret) > + goto out; > + > + ret = regmap_write(adg->regmap, A2B_PINTEN, adg->irq_enable); > + if (ret) > + goto out; > + > +out: > + mutex_unlock(&adg->mutex); > + > + if (ret) > + dev_err(adg->dev, > + "failed to update interrupt configuration: %d\n", ret); > +} > + > +static const struct irq_chip ad24xx_gpio_irq_chip = { > + .name = "ad24xx-gpio", > + .flags = IRQCHIP_IMMUTABLE, > + .irq_mask = ad24xx_gpio_irq_mask, > + .irq_unmask = ad24xx_gpio_irq_unmask, > + .irq_set_type = ad24xx_gpio_irq_set_type, > + .irq_bus_lock = ad24xx_gpio_irq_bus_lock, > + .irq_bus_sync_unlock = ad24xx_gpio_irq_bus_sync_unlock, > + GPIOCHIP_IRQ_RESOURCE_HELPERS, > +}; > + > +static const struct regmap_config ad24xx_gpio_regmap_config = { > + .reg_bits = 8, > + .val_bits = 8, > +}; > + > +static int ad24xx_gpio_probe(struct device *dev) > +{ > + struct a2b_func *func = to_a2b_func(dev); > + struct a2b_node *node = func->node; > + struct fwnode_handle *fwnode = of_node_to_fwnode(dev->of_node); > + struct gpio_chip *gpio_chip; > + struct gpio_irq_chip *irq_chip; > + struct irq_domain *parent_domain; > + struct ad24xx_gpio *adg; > + struct device_node *np; > + int ret; > + > + adg = devm_kzalloc(dev, sizeof(*adg), GFP_KERNEL); > + if (!adg) > + return -ENOMEM; > + > + adg->regmap = > + devm_regmap_init_a2b_func(func, &ad24xx_gpio_regmap_config); > + if (IS_ERR(adg->regmap)) > + return PTR_ERR(adg->regmap); > + > + adg->dev = dev; > + adg->func = func; > + adg->node = node; > + mutex_init(&adg->mutex); > + > + np = of_irq_find_parent(dev->of_node); > + if (!np) > + return -ENOENT; > + > + parent_domain = irq_find_host(np); > + of_node_put(np); > + if (!parent_domain) > + return -ENOENT; > + > + gpio_chip = &adg->gpio_chip; > + gpio_chip->label = dev_name(dev); > + gpio_chip->parent = dev; > + gpio_chip->fwnode = fwnode; > + gpio_chip->owner = THIS_MODULE; > + gpio_chip->get_direction = ad24xx_gpio_get_direction; > + gpio_chip->direction_input = ad24xx_gpio_direction_input; > + gpio_chip->direction_output = ad24xx_gpio_direction_output; > + gpio_chip->get = ad24xx_gpio_get; > + gpio_chip->set = ad24xx_gpio_set; > + gpio_chip->base = -1; > + gpio_chip->ngpio = node->chip_info->max_gpios; > + gpio_chip->can_sleep = true; > + > + irq_chip = &gpio_chip->irq; > + gpio_irq_chip_set_chip(irq_chip, &ad24xx_gpio_irq_chip); > + irq_chip->fwnode = fwnode; > + irq_chip->parent_domain = parent_domain; > + irq_chip->child_to_parent_hwirq = ad24xx_gpio_child_to_parent_hwirq; > + irq_chip->handler = handle_bad_irq; > + irq_chip->default_type = IRQ_TYPE_NONE; > + > + /* Initialize all GPIOs as inputs for high impedance state */ > + ret = regmap_write(adg->regmap, A2B_GPIOIEN, 0xFF); > + if (ret) > + return ret; > + > + ret = devm_gpiochip_add_data(dev, gpio_chip, adg); > + if (ret) > + return ret; > + > + return 0; > +} > + > +static const struct of_device_id ad24xx_gpio_of_match_table[] = { > + { .compatible = "adi,ad2401-gpio" }, > + { .compatible = "adi,ad2402-gpio" }, > + { .compatible = "adi,ad2403-gpio" }, > + { .compatible = "adi,ad2410-gpio" }, > + { .compatible = "adi,ad2420-gpio" }, > + { .compatible = "adi,ad2421-gpio" }, > + { .compatible = "adi,ad2422-gpio" }, > + { .compatible = "adi,ad2425-gpio" }, > + { .compatible = "adi,ad2426-gpio" }, > + { .compatible = "adi,ad2427-gpio" }, > + { .compatible = "adi,ad2428-gpio" }, > + { .compatible = "adi,ad2429-gpio" }, > + { /* sentinel */ } > +}; > +MODULE_DEVICE_TABLE(of, ad24xx_gpio_of_match_table); > + > +static struct a2b_driver ad24xx_gpio_driver = { > + .driver = { > + .name = "ad24xx-gpio", > + .of_match_table = ad24xx_gpio_of_match_table, > + .probe_type = PROBE_PREFER_ASYNCHRONOUS, > + }, > + .probe = ad24xx_gpio_probe, > +}; > +module_a2b_driver(ad24xx_gpio_driver); > + > +MODULE_AUTHOR("Alvin Šipraga <alsi@bang-olufsen.dk>"); > +MODULE_DESCRIPTION("AD24xx GPIO driver"); > +MODULE_LICENSE("GPL"); > > -- > 2.44.0 >
Hi Alvin, thanks for your patch! On Fri, May 17, 2024 at 2:58 PM Alvin Šipraga <alvin@pqrs.dk> wrote: > From: Alvin Šipraga <alsi@bang-olufsen.dk> > > This driver adds GPIO function support for AD24xx A2B transceiver chips. > When a GPIO is requested, the relevant pin is automatically muxed to > GPIO mode. The device tree property gpio-reserved-ranges can be used to > protect certain pins which are reserved for other functionality such as > I2S/TDM data. > > Signed-off-by: Alvin Šipraga <alsi@bang-olufsen.dk> (...) > config A2B_AD24XX_NODE > tristate "Analog Devices Inc. AD24xx node support" > select REGMAP_A2B > + imply GPIO_AD24XX Maybe it should even be select, if it's hard to think about a case where this is not desired? > +config GPIO_AD24XX > + tristate "Analog Devies Inc. AD24xx GPIO support" > + depends on A2B_AD24XX_NODE > + help > + Say Y here to enable GPIO support for AD24xx A2B transceivers. > + > config GPIO_ARIZONA > tristate "Wolfson Microelectronics Arizona class devices" > depends on MFD_ARIZONA This is grouped with the MFD devices but as I understand it A2B is a completely new bus type? Is MFD even always selected when A2B is in use? To me it's fine to add a new submenu for A2B devices, if there will be more of them. > +static int ad24xx_gpio_get_direction(struct gpio_chip *gc, unsigned int offset) > +{ > + struct ad24xx_gpio *adg = gpiochip_get_data(gc); > + unsigned int val; > + int ret; > + > + ret = regmap_read(adg->regmap, A2B_GPIOOEN, &val); > + if (ret) > + return ret; > + > + if (val & BIT(offset)) > + return 0; /* output */ > + > + return 1; /* input */ Please use GPIO_LINE_DIRECTION_OUT/GPIO_LINE_DIRECTION_IN instead of 0/1 here? Then you don't need the comments because it's evident. > +static int ad24xx_gpio_get(struct gpio_chip *gc, unsigned int offset) > +{ > + struct ad24xx_gpio *adg = gpiochip_get_data(gc); > + unsigned int val; > + int ret; > + > + ret = regmap_read(adg->regmap, A2B_GPIOIN, &val); > + if (ret) > + return ret; > + > + if (val & BIT(offset)) > + return 1; /* high */ > + > + return 0; /* low */ Just return !!(val & BIT(offset)); > +static int ad24xx_gpio_child_to_parent_hwirq(struct gpio_chip *gc, > + unsigned int child, > + unsigned int child_type, > + unsigned int *parent, > + unsigned int *parent_type) > +{ > + *parent = child; > + return 0; > +} This deserves a comment, is IRQ 0 the singular parent of everything? Then it doesn't seem very hierarchical but rather cascaded don't you think? > +static int ad24xx_gpio_irq_set_type(struct irq_data *d, unsigned int type) > +{ > + struct gpio_chip *gpio_chip = irq_data_get_irq_chip_data(d); > + struct ad24xx_gpio *adg = gpiochip_get_data(gpio_chip); > + irq_hw_number_t hwirq = irqd_to_hwirq(d); > + > + switch (type) { > + case IRQ_TYPE_EDGE_RISING: > + adg->irq_invert &= ~BIT(hwirq); > + break; > + case IRQ_TYPE_EDGE_FALLING: > + adg->irq_invert |= BIT(hwirq); > + break; > + default: > + return -EINVAL; > + } No need for the "toggling trick" for supporting IRQ on both edges? Implementing that hack (which is in several drivers) will be nice to have for e.g. pushbuttons. > +static void ad24xx_gpio_irq_bus_lock(struct irq_data *d) > +{ > + struct gpio_chip *gpio_chip = irq_data_get_irq_chip_data(d); > + struct ad24xx_gpio *adg = gpiochip_get_data(gpio_chip); > + > + mutex_lock(&adg->mutex); > +} Is this mutex needed since there is already a mutex or spinlock in the regmap? Isn't this the case for A2B? Yours, Linus Walleij
Fri, May 17, 2024 at 02:58:04PM +0200, Alvin Šipraga kirjoitti: > From: Alvin Šipraga <alsi@bang-olufsen.dk> > > This driver adds GPIO function support for AD24xx A2B transceiver chips. "Add GPIO..." > When a GPIO is requested, the relevant pin is automatically muxed to > GPIO mode. The device tree property gpio-reserved-ranges can be used to > protect certain pins which are reserved for other functionality such as > I2S/TDM data. Why this doesn't use gpio-regmap? ... > +config GPIO_AD24XX > + tristate "Analog Devies Inc. AD24xx GPIO support" > + depends on A2B_AD24XX_NODE > + help > + Say Y here to enable GPIO support for AD24xx A2B transceivers. checkpatch probably complain about too short help text. You may extend it by explaining how module will be called. ... > +#include <linux/a2b/a2b.h> > +#include <linux/a2b/ad24xx.h> This seems to me not so generic as below... + bits.h + device.h + err.h > +#include <linux/gpio/driver.h> > +#include <linux/interrupt.h> + mod_devicetable.h > +#include <linux/module.h> + mutex.h > +#include <linux/of_irq.h> Please, can we avoid OF in a new code? > +#include <linux/regmap.h> ...hence move that group here and put a blank line before. ... > +struct ad24xx_gpio { > + struct device *dev; > + struct a2b_func *func; > + struct a2b_node *node; > + struct regmap *regmap; > + int irqs[AD24XX_MAX_GPIOS]; > + struct gpio_chip gpio_chip; If you move this to be the first member, you might get less code being generated at compile time. > + struct irq_chip irq_chip; Should not be here, but static. > + struct mutex mutex; > + unsigned int irq_invert : AD24XX_MAX_GPIOS; > + unsigned int irq_enable : AD24XX_MAX_GPIOS; > +}; ... > + if (ret) > + dev_err(adg->dev, > + "failed to update interrupt configuration: %d\n", ret); Why and how is this useful? ... > + struct fwnode_handle *fwnode = of_node_to_fwnode(dev->of_node); First of all it uses a wrong API (custom to IRQ core), second why do you need this? ... > + struct device_node *np; > + np = of_irq_find_parent(dev->of_node); > + if (!np) > + return -ENOENT; > + > + parent_domain = irq_find_host(np); > + of_node_put(np); > + if (!parent_domain) > + return -ENOENT; Why is this magic needed? ... > + ret = devm_gpiochip_add_data(dev, gpio_chip, adg); > + if (ret) > + return ret; > + > + return 0; return devm_gpiochip_add_data(...);
diff --git a/drivers/a2b/Kconfig b/drivers/a2b/Kconfig index 1f6d836463f3..8c894579e2fc 100644 --- a/drivers/a2b/Kconfig +++ b/drivers/a2b/Kconfig @@ -32,6 +32,7 @@ config A2B_AD24XX_I2C config A2B_AD24XX_NODE tristate "Analog Devices Inc. AD24xx node support" select REGMAP_A2B + imply GPIO_AD24XX help Say Y here to enable support for AD24xx A2B transceiver nodes. This applies to both main nodes and subordinate nodes. Supported models diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig index 3dbddec07028..72bd0d88d6b3 100644 --- a/drivers/gpio/Kconfig +++ b/drivers/gpio/Kconfig @@ -1241,6 +1241,12 @@ config GPIO_ALTERA_A10SR includes reads of pushbuttons and DIP switches as well as writes to LEDs. +config GPIO_AD24XX + tristate "Analog Devies Inc. AD24xx GPIO support" + depends on A2B_AD24XX_NODE + help + Say Y here to enable GPIO support for AD24xx A2B transceivers. + config GPIO_ARIZONA tristate "Wolfson Microelectronics Arizona class devices" depends on MFD_ARIZONA diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile index e2a53013780e..f625bb140143 100644 --- a/drivers/gpio/Makefile +++ b/drivers/gpio/Makefile @@ -24,6 +24,7 @@ obj-$(CONFIG_GPIO_104_IDI_48) += gpio-104-idi-48.o obj-$(CONFIG_GPIO_104_IDIO_16) += gpio-104-idio-16.o obj-$(CONFIG_GPIO_74X164) += gpio-74x164.o obj-$(CONFIG_GPIO_74XX_MMIO) += gpio-74xx-mmio.o +obj-$(CONFIG_GPIO_AD24XX) += gpio-ad24xx.o obj-$(CONFIG_GPIO_ADNP) += gpio-adnp.o obj-$(CONFIG_GPIO_ADP5520) += gpio-adp5520.o obj-$(CONFIG_GPIO_AGGREGATOR) += gpio-aggregator.o diff --git a/drivers/gpio/gpio-ad24xx.c b/drivers/gpio/gpio-ad24xx.c new file mode 100644 index 000000000000..097ea9e2d629 --- /dev/null +++ b/drivers/gpio/gpio-ad24xx.c @@ -0,0 +1,302 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * AD24xx GPIO driver + * + * Copyright (c) 2023-2024 Alvin Šipraga <alsi@bang-olufsen.dk> + */ + +#include <linux/a2b/a2b.h> +#include <linux/a2b/ad24xx.h> +#include <linux/gpio/driver.h> +#include <linux/interrupt.h> +#include <linux/module.h> +#include <linux/of_irq.h> +#include <linux/regmap.h> + +struct ad24xx_gpio { + struct device *dev; + struct a2b_func *func; + struct a2b_node *node; + struct regmap *regmap; + int irqs[AD24XX_MAX_GPIOS]; + struct gpio_chip gpio_chip; + struct irq_chip irq_chip; + struct mutex mutex; + unsigned int irq_invert : AD24XX_MAX_GPIOS; + unsigned int irq_enable : AD24XX_MAX_GPIOS; +}; + +static int ad24xx_gpio_get_direction(struct gpio_chip *gc, unsigned int offset) +{ + struct ad24xx_gpio *adg = gpiochip_get_data(gc); + unsigned int val; + int ret; + + ret = regmap_read(adg->regmap, A2B_GPIOOEN, &val); + if (ret) + return ret; + + if (val & BIT(offset)) + return 0; /* output */ + + return 1; /* input */ +} + +static int ad24xx_gpio_get(struct gpio_chip *gc, unsigned int offset) +{ + struct ad24xx_gpio *adg = gpiochip_get_data(gc); + unsigned int val; + int ret; + + ret = regmap_read(adg->regmap, A2B_GPIOIN, &val); + if (ret) + return ret; + + if (val & BIT(offset)) + return 1; /* high */ + + return 0; /* low */ +} + +static void ad24xx_gpio_set(struct gpio_chip *gc, unsigned int offset, + int value) +{ + struct ad24xx_gpio *adg = gpiochip_get_data(gc); + unsigned int reg = value ? A2B_GPIODATSET : A2B_GPIODATCLR; + + regmap_write(adg->regmap, reg, BIT(offset)); +} + +static int ad24xx_gpio_set_direction(struct ad24xx_gpio *adg, + unsigned int offset, + unsigned int direction) +{ + unsigned int mask = BIT(offset); + unsigned int ival = direction ? BIT(offset) : 0; + int ret; + + ret = regmap_update_bits(adg->regmap, A2B_GPIOIEN, mask, ival); + if (ret) + return ret; + + ret = regmap_update_bits(adg->regmap, A2B_GPIOOEN, mask, ~ival); + if (ret) + return ret; + + return 0; +} + +static int ad24xx_gpio_direction_input(struct gpio_chip *gc, + unsigned int offset) +{ + struct ad24xx_gpio *adg = gpiochip_get_data(gc); + + return ad24xx_gpio_set_direction(adg, offset, 1); +} + +static int ad24xx_gpio_direction_output(struct gpio_chip *gc, + unsigned int offset, int value) +{ + struct ad24xx_gpio *adg = gpiochip_get_data(gc); + + /* For atomicity, write the output value before setting the direction */ + ad24xx_gpio_set(gc, offset, value); + + return ad24xx_gpio_set_direction(adg, offset, 0); +} + +static int ad24xx_gpio_child_to_parent_hwirq(struct gpio_chip *gc, + unsigned int child, + unsigned int child_type, + unsigned int *parent, + unsigned int *parent_type) +{ + *parent = child; + return 0; +} + +static void ad24xx_gpio_irq_mask(struct irq_data *d) +{ + struct gpio_chip *gpio_chip = irq_data_get_irq_chip_data(d); + struct ad24xx_gpio *adg = gpiochip_get_data(gpio_chip); + irq_hw_number_t hwirq = irqd_to_hwirq(d); + + adg->irq_enable &= ~BIT(hwirq); + gpiochip_disable_irq(gpio_chip, hwirq); +} + +static void ad24xx_gpio_irq_unmask(struct irq_data *d) +{ + struct gpio_chip *gpio_chip = irq_data_get_irq_chip_data(d); + struct ad24xx_gpio *adg = gpiochip_get_data(gpio_chip); + irq_hw_number_t hwirq = irqd_to_hwirq(d); + + gpiochip_disable_irq(gpio_chip, hwirq); + adg->irq_enable |= BIT(hwirq); +} + +static int ad24xx_gpio_irq_set_type(struct irq_data *d, unsigned int type) +{ + struct gpio_chip *gpio_chip = irq_data_get_irq_chip_data(d); + struct ad24xx_gpio *adg = gpiochip_get_data(gpio_chip); + irq_hw_number_t hwirq = irqd_to_hwirq(d); + + switch (type) { + case IRQ_TYPE_EDGE_RISING: + adg->irq_invert &= ~BIT(hwirq); + break; + case IRQ_TYPE_EDGE_FALLING: + adg->irq_invert |= BIT(hwirq); + break; + default: + return -EINVAL; + } + + return 0; +} + +static void ad24xx_gpio_irq_bus_lock(struct irq_data *d) +{ + struct gpio_chip *gpio_chip = irq_data_get_irq_chip_data(d); + struct ad24xx_gpio *adg = gpiochip_get_data(gpio_chip); + + mutex_lock(&adg->mutex); +} + +static void ad24xx_gpio_irq_bus_sync_unlock(struct irq_data *d) +{ + struct gpio_chip *gpio_chip = irq_data_get_irq_chip_data(d); + struct ad24xx_gpio *adg = gpiochip_get_data(gpio_chip); + int ret; + + ret = regmap_write(adg->regmap, A2B_PINTINV, adg->irq_invert); + if (ret) + goto out; + + ret = regmap_write(adg->regmap, A2B_PINTEN, adg->irq_enable); + if (ret) + goto out; + +out: + mutex_unlock(&adg->mutex); + + if (ret) + dev_err(adg->dev, + "failed to update interrupt configuration: %d\n", ret); +} + +static const struct irq_chip ad24xx_gpio_irq_chip = { + .name = "ad24xx-gpio", + .flags = IRQCHIP_IMMUTABLE, + .irq_mask = ad24xx_gpio_irq_mask, + .irq_unmask = ad24xx_gpio_irq_unmask, + .irq_set_type = ad24xx_gpio_irq_set_type, + .irq_bus_lock = ad24xx_gpio_irq_bus_lock, + .irq_bus_sync_unlock = ad24xx_gpio_irq_bus_sync_unlock, + GPIOCHIP_IRQ_RESOURCE_HELPERS, +}; + +static const struct regmap_config ad24xx_gpio_regmap_config = { + .reg_bits = 8, + .val_bits = 8, +}; + +static int ad24xx_gpio_probe(struct device *dev) +{ + struct a2b_func *func = to_a2b_func(dev); + struct a2b_node *node = func->node; + struct fwnode_handle *fwnode = of_node_to_fwnode(dev->of_node); + struct gpio_chip *gpio_chip; + struct gpio_irq_chip *irq_chip; + struct irq_domain *parent_domain; + struct ad24xx_gpio *adg; + struct device_node *np; + int ret; + + adg = devm_kzalloc(dev, sizeof(*adg), GFP_KERNEL); + if (!adg) + return -ENOMEM; + + adg->regmap = + devm_regmap_init_a2b_func(func, &ad24xx_gpio_regmap_config); + if (IS_ERR(adg->regmap)) + return PTR_ERR(adg->regmap); + + adg->dev = dev; + adg->func = func; + adg->node = node; + mutex_init(&adg->mutex); + + np = of_irq_find_parent(dev->of_node); + if (!np) + return -ENOENT; + + parent_domain = irq_find_host(np); + of_node_put(np); + if (!parent_domain) + return -ENOENT; + + gpio_chip = &adg->gpio_chip; + gpio_chip->label = dev_name(dev); + gpio_chip->parent = dev; + gpio_chip->fwnode = fwnode; + gpio_chip->owner = THIS_MODULE; + gpio_chip->get_direction = ad24xx_gpio_get_direction; + gpio_chip->direction_input = ad24xx_gpio_direction_input; + gpio_chip->direction_output = ad24xx_gpio_direction_output; + gpio_chip->get = ad24xx_gpio_get; + gpio_chip->set = ad24xx_gpio_set; + gpio_chip->base = -1; + gpio_chip->ngpio = node->chip_info->max_gpios; + gpio_chip->can_sleep = true; + + irq_chip = &gpio_chip->irq; + gpio_irq_chip_set_chip(irq_chip, &ad24xx_gpio_irq_chip); + irq_chip->fwnode = fwnode; + irq_chip->parent_domain = parent_domain; + irq_chip->child_to_parent_hwirq = ad24xx_gpio_child_to_parent_hwirq; + irq_chip->handler = handle_bad_irq; + irq_chip->default_type = IRQ_TYPE_NONE; + + /* Initialize all GPIOs as inputs for high impedance state */ + ret = regmap_write(adg->regmap, A2B_GPIOIEN, 0xFF); + if (ret) + return ret; + + ret = devm_gpiochip_add_data(dev, gpio_chip, adg); + if (ret) + return ret; + + return 0; +} + +static const struct of_device_id ad24xx_gpio_of_match_table[] = { + { .compatible = "adi,ad2401-gpio" }, + { .compatible = "adi,ad2402-gpio" }, + { .compatible = "adi,ad2403-gpio" }, + { .compatible = "adi,ad2410-gpio" }, + { .compatible = "adi,ad2420-gpio" }, + { .compatible = "adi,ad2421-gpio" }, + { .compatible = "adi,ad2422-gpio" }, + { .compatible = "adi,ad2425-gpio" }, + { .compatible = "adi,ad2426-gpio" }, + { .compatible = "adi,ad2427-gpio" }, + { .compatible = "adi,ad2428-gpio" }, + { .compatible = "adi,ad2429-gpio" }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, ad24xx_gpio_of_match_table); + +static struct a2b_driver ad24xx_gpio_driver = { + .driver = { + .name = "ad24xx-gpio", + .of_match_table = ad24xx_gpio_of_match_table, + .probe_type = PROBE_PREFER_ASYNCHRONOUS, + }, + .probe = ad24xx_gpio_probe, +}; +module_a2b_driver(ad24xx_gpio_driver); + +MODULE_AUTHOR("Alvin Šipraga <alsi@bang-olufsen.dk>"); +MODULE_DESCRIPTION("AD24xx GPIO driver"); +MODULE_LICENSE("GPL");