linux/drivers/pinctrl/pinctrl-axp209.c
Samuel Holland d4c0b614b5 pinctrl: axp209: Support the AXP221/AXP223/AXP809 variant
These PMICs each have 2 GPIOs with the same register layout as AXP813,
but without an ADC function. They all fall back to the AXP221 compatible
string, so only that one needs to be listed in the driver.

Signed-off-by: Samuel Holland <samuel@sholland.org>
Reviewed-by: Chen-Yu Tsai <wens@csie.org>
Link: https://lore.kernel.org/r/20220621034224.38995-4-samuel@sholland.org
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2022-06-30 14:05:57 +02:00

503 lines
13 KiB
C

// SPDX-License-Identifier: GPL-2.0-or-later
/*
* AXP20x pinctrl and GPIO driver
*
* Copyright (C) 2016 Maxime Ripard <maxime.ripard@free-electrons.com>
* Copyright (C) 2017 Quentin Schulz <quentin.schulz@free-electrons.com>
*/
#include <linux/bitops.h>
#include <linux/device.h>
#include <linux/gpio/driver.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/mfd/axp20x.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/pinctrl/pinconf-generic.h>
#include <linux/pinctrl/pinctrl.h>
#include <linux/pinctrl/pinmux.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/slab.h>
#define AXP20X_GPIO_FUNCTIONS 0x7
#define AXP20X_GPIO_FUNCTION_OUT_LOW 0
#define AXP20X_GPIO_FUNCTION_OUT_HIGH 1
#define AXP20X_GPIO_FUNCTION_INPUT 2
#define AXP20X_FUNC_GPIO_OUT 0
#define AXP20X_FUNC_GPIO_IN 1
#define AXP20X_FUNC_LDO 2
#define AXP20X_FUNC_ADC 3
#define AXP20X_FUNCS_NB 4
#define AXP20X_MUX_GPIO_OUT 0
#define AXP20X_MUX_GPIO_IN BIT(1)
#define AXP20X_MUX_ADC BIT(2)
#define AXP813_MUX_ADC (BIT(2) | BIT(0))
struct axp20x_pctrl_desc {
const struct pinctrl_pin_desc *pins;
unsigned int npins;
/* Stores the pins supporting LDO function. Bit offset is pin number. */
u8 ldo_mask;
/* Stores the pins supporting ADC function. Bit offset is pin number. */
u8 adc_mask;
u8 gpio_status_offset;
u8 adc_mux;
};
struct axp20x_pinctrl_function {
const char *name;
unsigned int muxval;
const char **groups;
unsigned int ngroups;
};
struct axp20x_pctl {
struct gpio_chip chip;
struct regmap *regmap;
struct pinctrl_dev *pctl_dev;
struct device *dev;
const struct axp20x_pctrl_desc *desc;
struct axp20x_pinctrl_function funcs[AXP20X_FUNCS_NB];
};
static const struct pinctrl_pin_desc axp209_pins[] = {
PINCTRL_PIN(0, "GPIO0"),
PINCTRL_PIN(1, "GPIO1"),
PINCTRL_PIN(2, "GPIO2"),
};
static const struct pinctrl_pin_desc axp22x_pins[] = {
PINCTRL_PIN(0, "GPIO0"),
PINCTRL_PIN(1, "GPIO1"),
};
static const struct axp20x_pctrl_desc axp20x_data = {
.pins = axp209_pins,
.npins = ARRAY_SIZE(axp209_pins),
.ldo_mask = BIT(0) | BIT(1),
.adc_mask = BIT(0) | BIT(1),
.gpio_status_offset = 4,
.adc_mux = AXP20X_MUX_ADC,
};
static const struct axp20x_pctrl_desc axp22x_data = {
.pins = axp22x_pins,
.npins = ARRAY_SIZE(axp22x_pins),
.ldo_mask = BIT(0) | BIT(1),
.gpio_status_offset = 0,
};
static const struct axp20x_pctrl_desc axp813_data = {
.pins = axp22x_pins,
.npins = ARRAY_SIZE(axp22x_pins),
.ldo_mask = BIT(0) | BIT(1),
.adc_mask = BIT(0),
.gpio_status_offset = 0,
.adc_mux = AXP813_MUX_ADC,
};
static int axp20x_gpio_get_reg(unsigned int offset)
{
switch (offset) {
case 0:
return AXP20X_GPIO0_CTRL;
case 1:
return AXP20X_GPIO1_CTRL;
case 2:
return AXP20X_GPIO2_CTRL;
}
return -EINVAL;
}
static int axp20x_gpio_input(struct gpio_chip *chip, unsigned int offset)
{
return pinctrl_gpio_direction_input(chip->base + offset);
}
static int axp20x_gpio_get(struct gpio_chip *chip, unsigned int offset)
{
struct axp20x_pctl *pctl = gpiochip_get_data(chip);
unsigned int val;
int ret;
ret = regmap_read(pctl->regmap, AXP20X_GPIO20_SS, &val);
if (ret)
return ret;
return !!(val & BIT(offset + pctl->desc->gpio_status_offset));
}
static int axp20x_gpio_get_direction(struct gpio_chip *chip,
unsigned int offset)
{
struct axp20x_pctl *pctl = gpiochip_get_data(chip);
unsigned int val;
int reg, ret;
reg = axp20x_gpio_get_reg(offset);
if (reg < 0)
return reg;
ret = regmap_read(pctl->regmap, reg, &val);
if (ret)
return ret;
/*
* This shouldn't really happen if the pin is in use already,
* or if it's not in use yet, it doesn't matter since we're
* going to change the value soon anyway. Default to output.
*/
if ((val & AXP20X_GPIO_FUNCTIONS) > 2)
return GPIO_LINE_DIRECTION_OUT;
/*
* The GPIO directions are the three lowest values.
* 2 is input, 0 and 1 are output
*/
if (val & 2)
return GPIO_LINE_DIRECTION_IN;
return GPIO_LINE_DIRECTION_OUT;
}
static int axp20x_gpio_output(struct gpio_chip *chip, unsigned int offset,
int value)
{
chip->set(chip, offset, value);
return 0;
}
static void axp20x_gpio_set(struct gpio_chip *chip, unsigned int offset,
int value)
{
struct axp20x_pctl *pctl = gpiochip_get_data(chip);
int reg;
reg = axp20x_gpio_get_reg(offset);
if (reg < 0)
return;
regmap_update_bits(pctl->regmap, reg,
AXP20X_GPIO_FUNCTIONS,
value ? AXP20X_GPIO_FUNCTION_OUT_HIGH :
AXP20X_GPIO_FUNCTION_OUT_LOW);
}
static int axp20x_pmx_set(struct pinctrl_dev *pctldev, unsigned int offset,
u8 config)
{
struct axp20x_pctl *pctl = pinctrl_dev_get_drvdata(pctldev);
int reg;
reg = axp20x_gpio_get_reg(offset);
if (reg < 0)
return reg;
return regmap_update_bits(pctl->regmap, reg, AXP20X_GPIO_FUNCTIONS,
config);
}
static int axp20x_pmx_func_cnt(struct pinctrl_dev *pctldev)
{
struct axp20x_pctl *pctl = pinctrl_dev_get_drvdata(pctldev);
return ARRAY_SIZE(pctl->funcs);
}
static const char *axp20x_pmx_func_name(struct pinctrl_dev *pctldev,
unsigned int selector)
{
struct axp20x_pctl *pctl = pinctrl_dev_get_drvdata(pctldev);
return pctl->funcs[selector].name;
}
static int axp20x_pmx_func_groups(struct pinctrl_dev *pctldev,
unsigned int selector,
const char * const **groups,
unsigned int *num_groups)
{
struct axp20x_pctl *pctl = pinctrl_dev_get_drvdata(pctldev);
*groups = pctl->funcs[selector].groups;
*num_groups = pctl->funcs[selector].ngroups;
return 0;
}
static int axp20x_pmx_set_mux(struct pinctrl_dev *pctldev,
unsigned int function, unsigned int group)
{
struct axp20x_pctl *pctl = pinctrl_dev_get_drvdata(pctldev);
unsigned int mask;
/* Every pin supports GPIO_OUT and GPIO_IN functions */
if (function <= AXP20X_FUNC_GPIO_IN)
return axp20x_pmx_set(pctldev, group,
pctl->funcs[function].muxval);
if (function == AXP20X_FUNC_LDO)
mask = pctl->desc->ldo_mask;
else
mask = pctl->desc->adc_mask;
if (!(BIT(group) & mask))
return -EINVAL;
/*
* We let the regulator framework handle the LDO muxing as muxing bits
* are basically also regulators on/off bits. It's better not to enforce
* any state of the regulator when selecting LDO mux so that we don't
* interfere with the regulator driver.
*/
if (function == AXP20X_FUNC_LDO)
return 0;
return axp20x_pmx_set(pctldev, group, pctl->funcs[function].muxval);
}
static int axp20x_pmx_gpio_set_direction(struct pinctrl_dev *pctldev,
struct pinctrl_gpio_range *range,
unsigned int offset, bool input)
{
struct axp20x_pctl *pctl = pinctrl_dev_get_drvdata(pctldev);
if (input)
return axp20x_pmx_set(pctldev, offset,
pctl->funcs[AXP20X_FUNC_GPIO_IN].muxval);
return axp20x_pmx_set(pctldev, offset,
pctl->funcs[AXP20X_FUNC_GPIO_OUT].muxval);
}
static const struct pinmux_ops axp20x_pmx_ops = {
.get_functions_count = axp20x_pmx_func_cnt,
.get_function_name = axp20x_pmx_func_name,
.get_function_groups = axp20x_pmx_func_groups,
.set_mux = axp20x_pmx_set_mux,
.gpio_set_direction = axp20x_pmx_gpio_set_direction,
.strict = true,
};
static int axp20x_groups_cnt(struct pinctrl_dev *pctldev)
{
struct axp20x_pctl *pctl = pinctrl_dev_get_drvdata(pctldev);
return pctl->desc->npins;
}
static int axp20x_group_pins(struct pinctrl_dev *pctldev, unsigned int selector,
const unsigned int **pins, unsigned int *num_pins)
{
struct axp20x_pctl *pctl = pinctrl_dev_get_drvdata(pctldev);
*pins = (unsigned int *)&pctl->desc->pins[selector];
*num_pins = 1;
return 0;
}
static const char *axp20x_group_name(struct pinctrl_dev *pctldev,
unsigned int selector)
{
struct axp20x_pctl *pctl = pinctrl_dev_get_drvdata(pctldev);
return pctl->desc->pins[selector].name;
}
static const struct pinctrl_ops axp20x_pctrl_ops = {
.dt_node_to_map = pinconf_generic_dt_node_to_map_group,
.dt_free_map = pinconf_generic_dt_free_map,
.get_groups_count = axp20x_groups_cnt,
.get_group_name = axp20x_group_name,
.get_group_pins = axp20x_group_pins,
};
static int axp20x_funcs_groups_from_mask(struct device *dev, unsigned int mask,
unsigned int mask_len,
struct axp20x_pinctrl_function *func,
const struct pinctrl_pin_desc *pins)
{
unsigned long int mask_cpy = mask;
const char **group;
unsigned int ngroups = hweight8(mask);
int bit;
func->ngroups = ngroups;
if (func->ngroups > 0) {
func->groups = devm_kcalloc(dev,
ngroups, sizeof(const char *),
GFP_KERNEL);
if (!func->groups)
return -ENOMEM;
group = func->groups;
for_each_set_bit(bit, &mask_cpy, mask_len) {
*group = pins[bit].name;
group++;
}
}
return 0;
}
static int axp20x_build_funcs_groups(struct platform_device *pdev)
{
struct axp20x_pctl *pctl = platform_get_drvdata(pdev);
int i, ret, pin, npins = pctl->desc->npins;
pctl->funcs[AXP20X_FUNC_GPIO_OUT].name = "gpio_out";
pctl->funcs[AXP20X_FUNC_GPIO_OUT].muxval = AXP20X_MUX_GPIO_OUT;
pctl->funcs[AXP20X_FUNC_GPIO_IN].name = "gpio_in";
pctl->funcs[AXP20X_FUNC_GPIO_IN].muxval = AXP20X_MUX_GPIO_IN;
pctl->funcs[AXP20X_FUNC_LDO].name = "ldo";
/*
* Muxval for LDO is useless as we won't use it.
* See comment in axp20x_pmx_set_mux.
*/
pctl->funcs[AXP20X_FUNC_ADC].name = "adc";
pctl->funcs[AXP20X_FUNC_ADC].muxval = pctl->desc->adc_mux;
/* Every pin supports GPIO_OUT and GPIO_IN functions */
for (i = 0; i <= AXP20X_FUNC_GPIO_IN; i++) {
pctl->funcs[i].ngroups = npins;
pctl->funcs[i].groups = devm_kcalloc(&pdev->dev,
npins, sizeof(char *),
GFP_KERNEL);
if (!pctl->funcs[i].groups)
return -ENOMEM;
for (pin = 0; pin < npins; pin++)
pctl->funcs[i].groups[pin] = pctl->desc->pins[pin].name;
}
ret = axp20x_funcs_groups_from_mask(&pdev->dev, pctl->desc->ldo_mask,
npins, &pctl->funcs[AXP20X_FUNC_LDO],
pctl->desc->pins);
if (ret)
return ret;
ret = axp20x_funcs_groups_from_mask(&pdev->dev, pctl->desc->adc_mask,
npins, &pctl->funcs[AXP20X_FUNC_ADC],
pctl->desc->pins);
if (ret)
return ret;
return 0;
}
static const struct of_device_id axp20x_pctl_match[] = {
{ .compatible = "x-powers,axp209-gpio", .data = &axp20x_data, },
{ .compatible = "x-powers,axp221-gpio", .data = &axp22x_data, },
{ .compatible = "x-powers,axp813-gpio", .data = &axp813_data, },
{ }
};
MODULE_DEVICE_TABLE(of, axp20x_pctl_match);
static int axp20x_pctl_probe(struct platform_device *pdev)
{
struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent);
struct axp20x_pctl *pctl;
struct device *dev = &pdev->dev;
struct pinctrl_desc *pctrl_desc;
int ret;
if (!of_device_is_available(pdev->dev.of_node))
return -ENODEV;
if (!axp20x) {
dev_err(&pdev->dev, "Parent drvdata not set\n");
return -EINVAL;
}
pctl = devm_kzalloc(&pdev->dev, sizeof(*pctl), GFP_KERNEL);
if (!pctl)
return -ENOMEM;
pctl->chip.base = -1;
pctl->chip.can_sleep = true;
pctl->chip.request = gpiochip_generic_request;
pctl->chip.free = gpiochip_generic_free;
pctl->chip.parent = &pdev->dev;
pctl->chip.label = dev_name(&pdev->dev);
pctl->chip.owner = THIS_MODULE;
pctl->chip.get = axp20x_gpio_get;
pctl->chip.get_direction = axp20x_gpio_get_direction;
pctl->chip.set = axp20x_gpio_set;
pctl->chip.direction_input = axp20x_gpio_input;
pctl->chip.direction_output = axp20x_gpio_output;
pctl->desc = of_device_get_match_data(dev);
pctl->chip.ngpio = pctl->desc->npins;
pctl->regmap = axp20x->regmap;
pctl->dev = &pdev->dev;
platform_set_drvdata(pdev, pctl);
ret = axp20x_build_funcs_groups(pdev);
if (ret) {
dev_err(&pdev->dev, "failed to build groups\n");
return ret;
}
pctrl_desc = devm_kzalloc(&pdev->dev, sizeof(*pctrl_desc), GFP_KERNEL);
if (!pctrl_desc)
return -ENOMEM;
pctrl_desc->name = dev_name(&pdev->dev);
pctrl_desc->owner = THIS_MODULE;
pctrl_desc->pins = pctl->desc->pins;
pctrl_desc->npins = pctl->desc->npins;
pctrl_desc->pctlops = &axp20x_pctrl_ops;
pctrl_desc->pmxops = &axp20x_pmx_ops;
pctl->pctl_dev = devm_pinctrl_register(&pdev->dev, pctrl_desc, pctl);
if (IS_ERR(pctl->pctl_dev)) {
dev_err(&pdev->dev, "couldn't register pinctrl driver\n");
return PTR_ERR(pctl->pctl_dev);
}
ret = devm_gpiochip_add_data(&pdev->dev, &pctl->chip, pctl);
if (ret) {
dev_err(&pdev->dev, "Failed to register GPIO chip\n");
return ret;
}
ret = gpiochip_add_pin_range(&pctl->chip, dev_name(&pdev->dev),
pctl->desc->pins->number,
pctl->desc->pins->number,
pctl->desc->npins);
if (ret) {
dev_err(&pdev->dev, "failed to add pin range\n");
return ret;
}
dev_info(&pdev->dev, "AXP209 pinctrl and GPIO driver loaded\n");
return 0;
}
static struct platform_driver axp20x_pctl_driver = {
.probe = axp20x_pctl_probe,
.driver = {
.name = "axp20x-gpio",
.of_match_table = axp20x_pctl_match,
},
};
module_platform_driver(axp20x_pctl_driver);
MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");
MODULE_AUTHOR("Quentin Schulz <quentin.schulz@free-electrons.com>");
MODULE_DESCRIPTION("AXP20x PMIC pinctrl and GPIO driver");
MODULE_LICENSE("GPL");