linux/drivers/pinctrl/pinctrl-da9062.c
Andy Shevchenko ce85283733 pinctrl: Propagate firmware node from a parent device
When creating MFD platform devices the firmware node is left unset.
This, in particular, prevents GPIO library to use it for different
purposes. Propagate firmware node from the parent device and let
GPIO library do the right thing.

While at it, slightly modify the headers to reflect the usage of APIs.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Reviewed-by: Adam Thomson <Adam.Thomson.Opensource@diasemi.com>
Link: https://lore.kernel.org/r/20211216151227.58687-1-andriy.shevchenko@linux.intel.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2021-12-22 03:09:56 +01:00

301 lines
7.8 KiB
C

// SPDX-License-Identifier: GPL-2.0
/*
* Dialog DA9062 pinctrl and GPIO driver.
* Based on DA9055 GPIO driver.
*
* TODO:
* - add pinmux and pinctrl support (gpio alternate mode)
*
* Documents:
* [1] https://www.dialog-semiconductor.com/sites/default/files/da9062_datasheet_3v6.pdf
*
* Copyright (C) 2019 Pengutronix, Marco Felsch <kernel@pengutronix.de>
*/
#include <linux/bits.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/property.h>
#include <linux/regmap.h>
#include <linux/gpio/driver.h>
#include <linux/mfd/da9062/core.h>
#include <linux/mfd/da9062/registers.h>
/*
* We need this get the gpio_desc from a <gpio_chip,offset> tuple to decide if
* the gpio is active low without a vendor specific dt-binding.
*/
#include "../gpio/gpiolib.h"
#define DA9062_TYPE(offset) (4 * (offset % 2))
#define DA9062_PIN_SHIFT(offset) (4 * (offset % 2))
#define DA9062_PIN_ALTERNATE 0x00 /* gpio alternate mode */
#define DA9062_PIN_GPI 0x01 /* gpio in */
#define DA9062_PIN_GPO_OD 0x02 /* gpio out open-drain */
#define DA9062_PIN_GPO_PP 0x03 /* gpio out push-pull */
#define DA9062_GPIO_NUM 5
struct da9062_pctl {
struct da9062 *da9062;
struct gpio_chip gc;
unsigned int pin_config[DA9062_GPIO_NUM];
};
static int da9062_pctl_get_pin_mode(struct da9062_pctl *pctl,
unsigned int offset)
{
struct regmap *regmap = pctl->da9062->regmap;
int ret, val;
ret = regmap_read(regmap, DA9062AA_GPIO_0_1 + (offset >> 1), &val);
if (ret < 0)
return ret;
val >>= DA9062_PIN_SHIFT(offset);
val &= DA9062AA_GPIO0_PIN_MASK;
return val;
}
static int da9062_pctl_set_pin_mode(struct da9062_pctl *pctl,
unsigned int offset, unsigned int mode_req)
{
struct regmap *regmap = pctl->da9062->regmap;
unsigned int mode = mode_req;
unsigned int mask;
int ret;
mode &= DA9062AA_GPIO0_PIN_MASK;
mode <<= DA9062_PIN_SHIFT(offset);
mask = DA9062AA_GPIO0_PIN_MASK << DA9062_PIN_SHIFT(offset);
ret = regmap_update_bits(regmap, DA9062AA_GPIO_0_1 + (offset >> 1),
mask, mode);
if (!ret)
pctl->pin_config[offset] = mode_req;
return ret;
}
static int da9062_gpio_get(struct gpio_chip *gc, unsigned int offset)
{
struct da9062_pctl *pctl = gpiochip_get_data(gc);
struct regmap *regmap = pctl->da9062->regmap;
int gpio_mode, val;
int ret;
gpio_mode = da9062_pctl_get_pin_mode(pctl, offset);
if (gpio_mode < 0)
return gpio_mode;
switch (gpio_mode) {
case DA9062_PIN_ALTERNATE:
return -ENOTSUPP;
case DA9062_PIN_GPI:
ret = regmap_read(regmap, DA9062AA_STATUS_B, &val);
if (ret < 0)
return ret;
break;
case DA9062_PIN_GPO_OD:
case DA9062_PIN_GPO_PP:
ret = regmap_read(regmap, DA9062AA_GPIO_MODE0_4, &val);
if (ret < 0)
return ret;
}
return !!(val & BIT(offset));
}
static void da9062_gpio_set(struct gpio_chip *gc, unsigned int offset,
int value)
{
struct da9062_pctl *pctl = gpiochip_get_data(gc);
struct regmap *regmap = pctl->da9062->regmap;
regmap_update_bits(regmap, DA9062AA_GPIO_MODE0_4, BIT(offset),
value << offset);
}
static int da9062_gpio_get_direction(struct gpio_chip *gc, unsigned int offset)
{
struct da9062_pctl *pctl = gpiochip_get_data(gc);
int gpio_mode;
gpio_mode = da9062_pctl_get_pin_mode(pctl, offset);
if (gpio_mode < 0)
return gpio_mode;
switch (gpio_mode) {
case DA9062_PIN_ALTERNATE:
return -ENOTSUPP;
case DA9062_PIN_GPI:
return GPIO_LINE_DIRECTION_IN;
case DA9062_PIN_GPO_OD:
case DA9062_PIN_GPO_PP:
return GPIO_LINE_DIRECTION_OUT;
}
return -EINVAL;
}
static int da9062_gpio_direction_input(struct gpio_chip *gc,
unsigned int offset)
{
struct da9062_pctl *pctl = gpiochip_get_data(gc);
struct regmap *regmap = pctl->da9062->regmap;
struct gpio_desc *desc = gpiochip_get_desc(gc, offset);
unsigned int gpi_type;
int ret;
ret = da9062_pctl_set_pin_mode(pctl, offset, DA9062_PIN_GPI);
if (ret)
return ret;
/*
* If the gpio is active low we should set it in hw too. No worries
* about gpio_get() because we read and return the gpio-level. So the
* gpiolib active_low handling is still correct.
*
* 0 - active low, 1 - active high
*/
gpi_type = !gpiod_is_active_low(desc);
return regmap_update_bits(regmap, DA9062AA_GPIO_0_1 + (offset >> 1),
DA9062AA_GPIO0_TYPE_MASK << DA9062_TYPE(offset),
gpi_type << DA9062_TYPE(offset));
}
static int da9062_gpio_direction_output(struct gpio_chip *gc,
unsigned int offset, int value)
{
struct da9062_pctl *pctl = gpiochip_get_data(gc);
unsigned int pin_config = pctl->pin_config[offset];
int ret;
ret = da9062_pctl_set_pin_mode(pctl, offset, pin_config);
if (ret)
return ret;
da9062_gpio_set(gc, offset, value);
return 0;
}
static int da9062_gpio_set_config(struct gpio_chip *gc, unsigned int offset,
unsigned long config)
{
struct da9062_pctl *pctl = gpiochip_get_data(gc);
struct regmap *regmap = pctl->da9062->regmap;
int gpio_mode;
/*
* We need to meet the following restrictions [1, Figure 18]:
* - PIN_CONFIG_BIAS_PULL_DOWN -> only allowed if the pin is used as
* gpio input
* - PIN_CONFIG_BIAS_PULL_UP -> only allowed if the pin is used as
* gpio output open-drain.
*/
switch (pinconf_to_config_param(config)) {
case PIN_CONFIG_BIAS_DISABLE:
return regmap_update_bits(regmap, DA9062AA_CONFIG_K,
BIT(offset), 0);
case PIN_CONFIG_BIAS_PULL_DOWN:
gpio_mode = da9062_pctl_get_pin_mode(pctl, offset);
if (gpio_mode < 0)
return -EINVAL;
else if (gpio_mode != DA9062_PIN_GPI)
return -ENOTSUPP;
return regmap_update_bits(regmap, DA9062AA_CONFIG_K,
BIT(offset), BIT(offset));
case PIN_CONFIG_BIAS_PULL_UP:
gpio_mode = da9062_pctl_get_pin_mode(pctl, offset);
if (gpio_mode < 0)
return -EINVAL;
else if (gpio_mode != DA9062_PIN_GPO_OD)
return -ENOTSUPP;
return regmap_update_bits(regmap, DA9062AA_CONFIG_K,
BIT(offset), BIT(offset));
case PIN_CONFIG_DRIVE_OPEN_DRAIN:
return da9062_pctl_set_pin_mode(pctl, offset,
DA9062_PIN_GPO_OD);
case PIN_CONFIG_DRIVE_PUSH_PULL:
return da9062_pctl_set_pin_mode(pctl, offset,
DA9062_PIN_GPO_PP);
default:
return -ENOTSUPP;
}
}
static int da9062_gpio_to_irq(struct gpio_chip *gc, unsigned int offset)
{
struct da9062_pctl *pctl = gpiochip_get_data(gc);
struct da9062 *da9062 = pctl->da9062;
return regmap_irq_get_virq(da9062->regmap_irq,
DA9062_IRQ_GPI0 + offset);
}
static const struct gpio_chip reference_gc = {
.owner = THIS_MODULE,
.get = da9062_gpio_get,
.set = da9062_gpio_set,
.get_direction = da9062_gpio_get_direction,
.direction_input = da9062_gpio_direction_input,
.direction_output = da9062_gpio_direction_output,
.set_config = da9062_gpio_set_config,
.to_irq = da9062_gpio_to_irq,
.can_sleep = true,
.ngpio = DA9062_GPIO_NUM,
.base = -1,
};
static int da9062_pctl_probe(struct platform_device *pdev)
{
struct device *parent = pdev->dev.parent;
struct da9062_pctl *pctl;
int i;
device_set_node(&pdev->dev, dev_fwnode(pdev->dev.parent));
pctl = devm_kzalloc(&pdev->dev, sizeof(*pctl), GFP_KERNEL);
if (!pctl)
return -ENOMEM;
pctl->da9062 = dev_get_drvdata(parent);
if (!pctl->da9062)
return -EINVAL;
if (!device_property_present(parent, "gpio-controller"))
return 0;
for (i = 0; i < ARRAY_SIZE(pctl->pin_config); i++)
pctl->pin_config[i] = DA9062_PIN_GPO_PP;
/*
* Currently the driver handles only the GPIO support. The
* pinctrl/pinmux support can be added later if needed.
*/
pctl->gc = reference_gc;
pctl->gc.label = dev_name(&pdev->dev);
pctl->gc.parent = &pdev->dev;
platform_set_drvdata(pdev, pctl);
return devm_gpiochip_add_data(&pdev->dev, &pctl->gc, pctl);
}
static struct platform_driver da9062_pctl_driver = {
.probe = da9062_pctl_probe,
.driver = {
.name = "da9062-gpio",
},
};
module_platform_driver(da9062_pctl_driver);
MODULE_AUTHOR("Marco Felsch <kernel@pengutronix.de>");
MODULE_DESCRIPTION("DA9062 PMIC pinctrl and GPIO Driver");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:da9062-gpio");