/*
* ams AS3722 pin control and GPIO driver.
*
* Copyright (c) 2013, NVIDIA Corporation.
*
* Author: Laxman Dewangan <ldewangan@nvidia.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation version 2.
*
* This program is distributed "as is" WITHOUT ANY WARRANTY of any kind,
* whether express or implied; 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, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
* 02111-1307, USA
*/
#include <linux/delay.h>
#include <linux/gpio.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/mfd/as3722.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/pinctrl/consumer.h>
#include <linux/pinctrl/machine.h>
#include <linux/pinctrl/pinctrl.h>
#include <linux/pinctrl/pinconf-generic.h>
#include <linux/pinctrl/pinconf.h>
#include <linux/pinctrl/pinmux.h>
#include <linux/pm.h>
#include <linux/slab.h>
#include "core.h"
#include "pinconf.h"
#include "pinctrl-utils.h"
#define AS3722_PIN_GPIO0 0
#define AS3722_PIN_GPIO1 1
#define AS3722_PIN_GPIO2 2
#define AS3722_PIN_GPIO3 3
#define AS3722_PIN_GPIO4 4
#define AS3722_PIN_GPIO5 5
#define AS3722_PIN_GPIO6 6
#define AS3722_PIN_GPIO7 7
#define AS3722_PIN_NUM (AS3722_PIN_GPIO7 + 1)
#define AS3722_GPIO_MODE_PULL_UP BIT(PIN_CONFIG_BIAS_PULL_UP)
#define AS3722_GPIO_MODE_PULL_DOWN BIT(PIN_CONFIG_BIAS_PULL_DOWN)
#define AS3722_GPIO_MODE_HIGH_IMPED BIT(PIN_CONFIG_BIAS_HIGH_IMPEDANCE)
#define AS3722_GPIO_MODE_OPEN_DRAIN BIT(PIN_CONFIG_DRIVE_OPEN_DRAIN)
struct as3722_pin_function {
const char *name;
const char * const *groups;
unsigned ngroups;
int mux_option;
};
struct as3722_gpio_pin_control {
bool enable_gpio_invert;
unsigned mode_prop;
int io_function;
};
struct as3722_pingroup {
const char *name;
const unsigned pins[1];
unsigned npins;
};
struct as3722_pctrl_info {
struct device *dev;
struct pinctrl_dev *pctl;
struct as3722 *as3722;
struct gpio_chip gpio_chip;
int pins_current_opt[AS3722_PIN_NUM];
const struct as3722_pin_function *functions;
unsigned num_functions;
const struct as3722_pingroup *pin_groups;
int num_pin_groups;
const struct pinctrl_pin_desc *pins;
unsigned num_pins;
struct as3722_gpio_pin_control gpio_control[AS3722_PIN_NUM];
};
static const struct pinctrl_pin_desc as3722_pins_desc[] = {
PINCTRL_PIN(AS3722_PIN_GPIO0, "gpio0"),
PINCTRL_PIN(AS3722_PIN_GPIO1, "gpio1"),
PINCTRL_PIN(AS3722_PIN_GPIO2, "gpio2"),
PINCTRL_PIN(AS3722_PIN_GPIO3, "gpio3"),
PINCTRL_PIN(AS3722_PIN_GPIO4, "gpio4"),
PINCTRL_PIN(AS3722_PIN_GPIO5, "gpio5"),
PINCTRL_PIN(AS3722_PIN_GPIO6, "gpio6"),
PINCTRL_PIN(AS3722_PIN_GPIO7, "gpio7"),
};
static const char * const gpio_groups[] = {
"gpio0",
"gpio1",
"gpio2",
"gpio3",
"gpio4",
"gpio5",
"gpio6",
"gpio7",
};
enum as3722_pinmux_option {
AS3722_PINMUX_GPIO = 0,
AS3722_PINMUX_INTERRUPT_OUT = 1,
AS3722_PINMUX_VSUB_VBAT_UNDEB_LOW_OUT = 2,
AS3722_PINMUX_GPIO_INTERRUPT = 3,
AS3722_PINMUX_PWM_INPUT = 4,
AS3722_PINMUX_VOLTAGE_IN_STBY = 5,
AS3722_PINMUX_OC_PG_SD0 = 6,
AS3722_PINMUX_PG_OUT = 7,
AS3722_PINMUX_CLK32K_OUT = 8,
AS3722_PINMUX_WATCHDOG_INPUT = 9,
AS3722_PINMUX_SOFT_RESET_IN = 11,
AS3722_PINMUX_PWM_OUTPUT = 12,
AS3722_PINMUX_VSUB_VBAT_LOW_DEB_OUT = 13,
AS3722_PINMUX_OC_PG_SD6 = 14,
};
#define FUNCTION_GROUP(fname, mux) \
{ \
.name = #fname, \
.groups = gpio_groups, \
.ngroups = ARRAY_SIZE(gpio_groups), \
.mux_option = AS3722_PINMUX_##mux, \
}
static const struct as3722_pin_function as3722_pin_function[] = {
FUNCTION_GROUP(gpio, GPIO),
FUNCTION_GROUP(interrupt-out, INTERRUPT_OUT),
FUNCTION_GROUP(gpio-in-interrupt, GPIO_INTERRUPT),
FUNCTION_GROUP(vsup-vbat-low-undebounce-out, VSUB_VBAT_UNDEB_LOW_OUT),
FUNCTION_GROUP(vsup-vbat-low-debounce-out, VSUB_VBAT_LOW_DEB_OUT),
FUNCTION_GROUP(voltage-in-standby, VOLTAGE_IN_STBY),
FUNCTION_GROUP(oc-pg-sd0, OC_PG_SD0),
FUNCTION_GROUP(oc-pg-sd6, OC_PG_SD6),
FUNCTION_GROUP(powergood-out, PG_OUT),
FUNCTION_GROUP(pwm-in, PWM_INPUT),
FUNCTION_GROUP(pwm-out, PWM_OUTPUT),
FUNCTION_GROUP(clk32k-out, CLK32K_OUT),
FUNCTION_GROUP(watchdog-in, WATCHDOG_INPUT),
FUNCTION_GROUP(soft-reset-in, SOFT_RESET_IN),
};
#define AS3722_PINGROUP(pg_name, pin_id) \
{ \
.name = #pg_name, \
.pins = {AS3722_PIN_##pin_id}, \
.npins = 1, \
}
static const struct as3722_pingroup as3722_pingroups[] = {
AS3722_PINGROUP(gpio0, GPIO0),
AS3722_PINGROUP(gpio1, GPIO1),
AS3722_PINGROUP(gpio2, GPIO2),
AS3722_PINGROUP(gpio3, GPIO3),
AS3722_PINGROUP(gpio4, GPIO4),
AS3722_PINGROUP(gpio5, GPIO5),
AS3722_PINGROUP(gpio6, GPIO6),
AS3722_PINGROUP(gpio7, GPIO7),
};
static int as3722_pinctrl_get_groups_count(struct pinctrl_dev *pctldev)
{
struct as3722_pctrl_info *as_pci = pinctrl_dev_get_drvdata(pctldev);
return as_pci->num_pin_groups;
}
static const char *as3722_pinctrl_get_group_name(struct pinctrl_dev *pctldev,
unsigned group)
{
struct as3722_pctrl_info *as_pci = pinctrl_dev_get_drvdata(pctldev);
return as_pci->pin_groups[group].name;
}
static int as3722_pinctrl_get_group_pins(struct pinctrl_dev *pctldev,
unsigned group, const unsigned **pins, unsigned *num_pins)
{
struct as3722_pctrl_info *as_pci = pinctrl_dev_get_drvdata(pctldev);
*pins = as_pci->pin_groups[group].pins;
*num_pins = as_pci->pin_groups[group].npins;
return 0;
}
static const struct pinctrl_ops as3722_pinctrl_ops = {
.get_groups_count = as3722_pinctrl_get_groups_count,
.get_group_name = as3722_pinctrl_get_group_name,
.get_group_pins = as3722_pinctrl_get_group_pins,
.dt_node_to_map = pinconf_generic_dt_node_to_map_pin,
.dt_free_map = pinctrl_utils_dt_free_map,
};
static int as3722_pinctrl_get_funcs_count(struct pinctrl_dev *pctldev)
{
struct as3722_pctrl_info *as_pci = pinctrl_dev_get_drvdata(pctldev);
return as_pci->num_functions;
}
static const char *as3722_pinctrl_get_func_name(struct pinctrl_dev *pctldev,
unsigned function)
{
struct as3722_pctrl_info *as_pci = pinctrl_dev_get_drvdata(pctldev);
return as_pci->functions[function].name;
}
static int as3722_pinctrl_get_func_groups(struct pinctrl_dev *pctldev,
unsigned function, const char * const **groups,
unsigned * const num_groups)
{
struct as3722_pctrl_info *as_pci = pinctrl_dev_get_drvdata(pctldev);
*groups = as_pci->functions[function].groups;
*num_groups = as_pci->functions[function].ngroups;
return 0;
}
static int as3722_pinctrl_enable(struct pinctrl_dev *pctldev, unsigned function,
unsigned group)
{
struct as3722_pctrl_info *as_pci = pinctrl_dev_get_drvdata(pctldev);
int gpio_cntr_reg = AS3722_GPIOn_CONTROL_REG(group);
u8 val = AS3722_GPIO_IOSF_VAL(as_pci->functions[function].mux_option);
int ret;
dev_dbg(as_pci->dev, "%s(): GPIO %u pin to function %u and val %u\n",
__func__, group, function, val);
ret = as3722_update_bits(as_pci->as3722, gpio_cntr_reg,
AS3722_GPIO_IOSF_MASK, val);
if (ret < 0) {
dev_err(as_pci->dev, "GPIO%d_CTRL_REG update failed %d\n",
group, ret);
return ret;
}
as_pci->gpio_control[group].io_function = function;
return ret;
}
static int as3722_pinctrl_gpio_get_mode(unsigned gpio_mode_prop, bool input)
{
if (gpio_mode_prop & AS3722_GPIO_MODE_HIGH_IMPED)
return -EINVAL;
if (gpio_mode_prop & AS3722_GPIO_MODE_OPEN_DRAIN) {
if (gpio_mode_prop & AS3722_GPIO_MODE_PULL_UP)
return AS3722_GPIO_MODE_IO_OPEN_DRAIN_PULL_UP;
return AS3722_GPIO_MODE_IO_OPEN_DRAIN;
}
if (input) {
if (gpio_mode_prop & AS3722_GPIO_MODE_PULL_UP)
return AS3722_GPIO_MODE_INPUT_PULL_UP;
else if (gpio_mode_prop & AS3722_GPIO_MODE_PULL_DOWN)
return AS3722_GPIO_MODE_INPUT_PULL_DOWN;
return AS3722_GPIO_MODE_INPUT;
}
if (gpio_mode_prop & AS3722_GPIO_MODE_PULL_DOWN)
return AS3722_GPIO_MODE_OUTPUT_VDDL;
return AS3722_GPIO_MODE_OUTPUT_VDDH;
}
static int as3722_pinctrl_gpio_request_enable(struct pinctrl_dev *pctldev,
struct pinctrl_gpio_range *range, unsigned offset)
{
struct as3722_pctrl_info *as_pci = pinctrl_dev_get_drvdata(pctldev);
if (as_pci->gpio_control[offset].io_function)
return -EBUSY;
return 0;
}
static int as3722_pinctrl_gpio_set_direction(struct pinctrl_dev *pctldev,
struct pinctrl_gpio_range *range, unsigned offset, bool input)
{
struct as3722_pctrl_info *as_pci = pinctrl_dev_get_drvdata(pctldev);
struct as3722 *as3722 = as_pci->as3722;
int mode;
mode = as3722_pinctrl_gpio_get_mode(
as_pci->gpio_control[offset].mode_prop, input);
if (mode < 0) {
dev_err(as_pci->dev, "%s direction for GPIO %d not supported\n",
(input) ? "Input" : "Output", offset);
return mode;
}
if (as_pci->gpio_control[offset].enable_gpio_invert)
mode |= AS3722_GPIO_INV;
return as3722_write(as3722, AS3722_GPIOn_CONTROL_REG(offset), mode);
}
static const struct pinmux_ops as3722_pinmux_ops = {
.get_functions_count = as3722_pinctrl_get_funcs_count,
.get_function_name = as3722_pinctrl_get_func_name,
.get_function_groups = as3722_pinctrl_get_func_groups,
.enable = as3722_pinctrl_enable,
.gpio_request_enable = as3722_pinctrl_gpio_request_enable,
.gpio_set_direction = as3722_pinctrl_gpio_set_direction,
};
static int as3722_pinconf_get(struct pinctrl_dev *pctldev,
unsigned pin, unsigned long *config)
{
struct as3722_pctrl_info *as_pci = pinctrl_dev_get_drvdata(pctldev);
enum pin_config_param param = pinconf_to_config_param(*config);
int arg = 0;
u16 prop;
switch (param) {
case PIN_CONFIG_BIAS_DISABLE:
prop = AS3722_GPIO_MODE_PULL_UP |
AS3722_GPIO_MODE_PULL_DOWN;
if (!(as_pci->gpio_control[pin].mode_prop & prop))
arg = 1;
prop = 0;
break;
case PIN_CONFIG_BIAS_PULL_UP:
prop = AS3722_GPIO_MODE_PULL_UP;
break;
case PIN_CONFIG_BIAS_PULL_DOWN:
prop = AS3722_GPIO_MODE_PULL_DOWN;
break;
case PIN_CONFIG_DRIVE_OPEN_DRAIN:
prop = AS3722_GPIO_MODE_OPEN_DRAIN;
break;
case PIN_CONFIG_BIAS_HIGH_IMPEDANCE:
prop = AS3722_GPIO_MODE_HIGH_IMPED;
break;
default:
dev_err(as_pci->dev, "Properties not supported\n");
return -ENOTSUPP;
}
if (as_pci->gpio_control[pin].mode_prop & prop)
arg = 1;
*config = pinconf_to_config_packed(param, (u16)arg);
return 0;
}
static int as3722_pinconf_set(struct pinctrl_dev *pctldev,
unsigned pin, unsigned long *configs,
unsigned num_configs)
{
struct as3722_pctrl_info *as_pci = pinctrl_dev_get_drvdata(pctldev);
enum pin_config_param param;
int mode_prop;
int i;
for (i = 0; i < num_configs; i++) {
param = pinconf_to_config_param(configs[i]);
mode_prop = as_pci->gpio_control[pin].mode_prop;
switch (param) {
case PIN_CONFIG_BIAS_PULL_PIN_DEFAULT:
break;
case PIN_CONFIG_BIAS_DISABLE:
mode_prop &= ~(AS3722_GPIO_MODE_PULL_UP |
AS3722_GPIO_MODE_PULL_DOWN);
break;
case PIN_CONFIG_BIAS_PULL_UP:
mode_prop |= AS3722_GPIO_MODE_PULL_UP;
break;
case PIN_CONFIG_BIAS_PULL_DOWN:
mode_prop |= AS3722_GPIO_MODE_PULL_DOWN;
break;
case PIN_CONFIG_BIAS_HIGH_IMPEDANCE:
mode_prop |= AS3722_GPIO_MODE_HIGH_IMPED;
break;
case PIN_CONFIG_DRIVE_OPEN_DRAIN:
mode_prop |= AS3722_GPIO_MODE_OPEN_DRAIN;
break;
default:
dev_err(as_pci->dev, "Properties not supported\n");
return -ENOTSUPP;
}
as_pci->gpio_control[pin].mode_prop = mode_prop;
}
return 0;
}
static const struct pinconf_ops as3722_pinconf_ops = {
.pin_config_get = as3722_pinconf_get,
.pin_config_set = as3722_pinconf_set,
};
static struct pinctrl_desc as3722_pinctrl_desc = {
.pctlops = &as3722_pinctrl_ops,
.pmxops = &as3722_pinmux_ops,
.confops = &as3722_pinconf_ops,
.owner = THIS_MODULE,
};
static inline struct as3722_pctrl_info *to_as_pci(struct gpio_chip *chip)
{
return container_of(chip, struct as3722_pctrl_info, gpio_chip);
}
static int as3722_gpio_get(struct gpio_chip *chip, unsigned offset)
{
struct as3722_pctrl_info *as_pci = to_as_pci(chip);
struct as3722 *as3722 = as_pci->as3722;
int ret;
u32 reg;
u32 control;
u32 val;
int mode;
int invert_enable;
ret = as3722_read(as3722, AS3722_GPIOn_CONTROL_REG(offset), &control);
if (ret < 0) {
dev_err(as_pci->dev,
"GPIO_CONTROL%d_REG read failed: %d\n", offset, ret);
return ret;
}
invert_enable = !!(control & AS3722_GPIO_INV);
mode = control & AS3722_GPIO_MODE_MASK;
switch (mode) {
case AS3722_GPIO_MODE_INPUT:
case AS3722_GPIO_MODE_INPUT_PULL_UP:
case AS3722_GPIO_MODE_INPUT_PULL_DOWN:
case AS3722_GPIO_MODE_IO_OPEN_DRAIN:
case AS3722_GPIO_MODE_IO_OPEN_DRAIN_PULL_UP:
reg = AS3722_GPIO_SIGNAL_IN_REG;
break;
case AS3722_GPIO_MODE_OUTPUT_VDDH:
case AS3722_GPIO_MODE_OUTPUT_VDDL:
reg = AS3722_GPIO_SIGNAL_OUT_REG;
break;
default:
return -EINVAL;
}
ret = as3722_read(as3722, reg, &val);
if (ret < 0) {
dev_err(as_pci->dev,
"GPIO_SIGNAL_IN_REG read failed: %d\n", ret);
return ret;
}
val = !!(val & AS3722_GPIOn_SIGNAL(offset));
return (invert_enable) ? !val : val;
}
static void as3722_gpio_set(struct gpio_chip *chip, unsigned offset,
int value)
{
struct as3722_pctrl_info *as_pci = to_as_pci(chip);
struct as3722 *as3722 = as_pci->as3722;
int en_invert = as_pci->gpio_control[offset].enable_gpio_invert;
u32 val;
int ret;
if (value)
val = (en_invert) ? 0 : AS3722_GPIOn_SIGNAL(offset);
else
val = (en_invert) ? AS3722_GPIOn_SIGNAL(offset) : 0;
ret = as3722_update_bits(as3722, AS3722_GPIO_SIGNAL_OUT_REG,
AS3722_GPIOn_SIGNAL(offset), val);
if (ret < 0)
dev_err(as_pci->dev,
"GPIO_SIGNAL_OUT_REG update failed: %d\n", ret);
}
static int as3722_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
{
return pinctrl_gpio_direction_input(chip->base + offset);
}
static int as3722_gpio_direction_output(struct gpio_chip *chip,
unsigned offset, int value)
{
as3722_gpio_set(chip, offset, value);
return pinctrl_gpio_direction_output(chip->base + offset);
}
static int as3722_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
{
struct as3722_pctrl_info *as_pci = to_as_pci(chip);
return as3722_irq_get_virq(as_pci->as3722, offset);
}
static int as3722_gpio_request(struct gpio_chip *chip, unsigned offset)
{
return pinctrl_request_gpio(chip->base + offset);
}
static void as3722_gpio_free(struct gpio_chip *chip, unsigned offset)
{
pinctrl_free_gpio(chip->base + offset);
}
static const struct gpio_chip as3722_gpio_chip = {
.label = "as3722-gpio",
.owner = THIS_MODULE,
.request = as3722_gpio_request,
.free = as3722_gpio_free,
.get = as3722_gpio_get,
.set = as3722_gpio_set,
.direction_input = as3722_gpio_direction_input,
.direction_output = as3722_gpio_direction_output,
.to_irq = as3722_gpio_to_irq,
.can_sleep = 1,
.ngpio = AS3722_PIN_NUM,
.base = -1,
};
static int as3722_pinctrl_probe(struct platform_device *pdev)
{
struct as3722_pctrl_info *as_pci;
int ret;
int tret;
as_pci = devm_kzalloc(&pdev->dev, sizeof(*as_pci), GFP_KERNEL);
if (!as_pci)
return -ENOMEM;
as_pci->dev = &pdev->dev;
as_pci->dev->of_node = pdev->dev.parent->of_node;
as_pci->as3722 = dev_get_drvdata(pdev->dev.parent);
platform_set_drvdata(pdev, as_pci);
as_pci->pins = as3722_pins_desc;
as_pci->num_pins = ARRAY_SIZE(as3722_pins_desc);
as_pci->functions = as3722_pin_function;
as_pci->num_functions = ARRAY_SIZE(as3722_pin_function);
as_pci->pin_groups = as3722_pingroups;
as_pci->num_pin_groups = ARRAY_SIZE(as3722_pingroups);
as3722_pinctrl_desc.name = dev_name(&pdev->dev);
as3722_pinctrl_desc.pins = as3722_pins_desc;
as3722_pinctrl_desc.npins = ARRAY_SIZE(as3722_pins_desc);
as_pci->pctl = pinctrl_register(&as3722_pinctrl_desc,
&pdev->dev, as_pci);
if (!as_pci->pctl) {
dev_err(&pdev->dev, "Couldn't register pinctrl driver\n");
return -EINVAL;
}
as_pci->gpio_chip = as3722_gpio_chip;
as_pci->gpio_chip.dev = &pdev->dev;
as_pci->gpio_chip.of_node = pdev->dev.parent->of_node;
ret = gpiochip_add(&as_pci->gpio_chip);
if (ret < 0) {
dev_err(&pdev->dev, "Couldn't register gpiochip, %d\n", ret);
goto fail_chip_add;
}
ret = gpiochip_add_pin_range(&as_pci->gpio_chip, dev_name(&pdev->dev),
0, 0, AS3722_PIN_NUM);
if (ret < 0) {
dev_err(&pdev->dev, "Couldn't add pin range, %d\n", ret);
goto fail_range_add;
}
return 0;
fail_range_add:
tret = gpiochip_remove(&as_pci->gpio_chip);
if (tret < 0)
dev_warn(&pdev->dev, "Couldn't remove gpio chip, %d\n", tret);
fail_chip_add:
pinctrl_unregister(as_pci->pctl);
return ret;
}
static int as3722_pinctrl_remove(struct platform_device *pdev)
{
struct as3722_pctrl_info *as_pci = platform_get_drvdata(pdev);
int ret;
ret = gpiochip_remove(&as_pci->gpio_chip);
if (ret < 0)
return ret;
pinctrl_unregister(as_pci->pctl);
return 0;
}
static struct of_device_id as3722_pinctrl_of_match[] = {
{ .compatible = "ams,as3722-pinctrl", },
{ },
};
MODULE_DEVICE_TABLE(of, as3722_pinctrl_of_match);
static struct platform_driver as3722_pinctrl_driver = {
.driver = {
.name = "as3722-pinctrl",
.owner = THIS_MODULE,
.of_match_table = as3722_pinctrl_of_match,
},
.probe = as3722_pinctrl_probe,
.remove = as3722_pinctrl_remove,
};
module_platform_driver(as3722_pinctrl_driver);
MODULE_ALIAS("platform:as3722-pinctrl");
MODULE_DESCRIPTION("AS3722 pin control and GPIO driver");
MODULE_AUTHOR("Laxman Dewangan<ldewangan@nvidia.com>");
MODULE_LICENSE("GPL v2");
