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linux/drivers/gpio/gpio-wm8994.c
Alexandru Ardelean e076aeda46 gpio: wm8994: remove platform_set_drvdata() + cleanup probe 
The platform_set_drvdata() call is only useful if we need to retrieve back
the private information.
Since the driver doesn't do that, it's not useful to have it.

If this is removed, we can also just do a direct return on
devm_gpiochip_add_data(). We don't need to print that this call failed as
there are other ways to log/see this during probe.

Signed-off-by: Alexandru Ardelean <aardelean@deviqon.com>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
2021-05-25 16:21:14 +02:00

305 lines
7.3 KiB
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// SPDX-License-Identifier: GPL-2.0+
/*
* gpiolib support for Wolfson WM8994
*
* Copyright 2009 Wolfson Microelectronics PLC.
*
* Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
*
*/
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/gpio/driver.h>
#include <linux/mfd/core.h>
#include <linux/platform_device.h>
#include <linux/seq_file.h>
#include <linux/regmap.h>
#include <linux/mfd/wm8994/core.h>
#include <linux/mfd/wm8994/pdata.h>
#include <linux/mfd/wm8994/gpio.h>
#include <linux/mfd/wm8994/registers.h>
struct wm8994_gpio {
struct wm8994 *wm8994;
struct gpio_chip gpio_chip;
};
static int wm8994_gpio_request(struct gpio_chip *chip, unsigned offset)
{
struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);
struct wm8994 *wm8994 = wm8994_gpio->wm8994;
switch (wm8994->type) {
case WM8958:
switch (offset) {
case 1:
case 2:
case 3:
case 4:
case 6:
return -EINVAL;
}
break;
default:
break;
}
return 0;
}
static int wm8994_gpio_direction_in(struct gpio_chip *chip, unsigned offset)
{
struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);
struct wm8994 *wm8994 = wm8994_gpio->wm8994;
return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset,
WM8994_GPN_DIR, WM8994_GPN_DIR);
}
static int wm8994_gpio_get(struct gpio_chip *chip, unsigned offset)
{
struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);
struct wm8994 *wm8994 = wm8994_gpio->wm8994;
int ret;
ret = wm8994_reg_read(wm8994, WM8994_GPIO_1 + offset);
if (ret < 0)
return ret;
if (ret & WM8994_GPN_LVL)
return 1;
else
return 0;
}
static int wm8994_gpio_direction_out(struct gpio_chip *chip,
unsigned offset, int value)
{
struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);
struct wm8994 *wm8994 = wm8994_gpio->wm8994;
if (value)
value = WM8994_GPN_LVL;
return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset,
WM8994_GPN_DIR | WM8994_GPN_LVL, value);
}
static void wm8994_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
{
struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);
struct wm8994 *wm8994 = wm8994_gpio->wm8994;
if (value)
value = WM8994_GPN_LVL;
wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset, WM8994_GPN_LVL, value);
}
static int wm8994_gpio_set_config(struct gpio_chip *chip, unsigned int offset,
unsigned long config)
{
struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);
struct wm8994 *wm8994 = wm8994_gpio->wm8994;
switch (pinconf_to_config_param(config)) {
case PIN_CONFIG_DRIVE_OPEN_DRAIN:
return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset,
WM8994_GPN_OP_CFG_MASK,
WM8994_GPN_OP_CFG);
case PIN_CONFIG_DRIVE_PUSH_PULL:
return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset,
WM8994_GPN_OP_CFG_MASK, 0);
default:
break;
}
return -ENOTSUPP;
}
static int wm8994_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
{
struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);
struct wm8994 *wm8994 = wm8994_gpio->wm8994;
return regmap_irq_get_virq(wm8994->irq_data, offset);
}
#ifdef CONFIG_DEBUG_FS
static const char *wm8994_gpio_fn(u16 fn)
{
switch (fn) {
case WM8994_GP_FN_PIN_SPECIFIC:
return "pin-specific";
case WM8994_GP_FN_GPIO:
return "GPIO";
case WM8994_GP_FN_SDOUT:
return "SDOUT";
case WM8994_GP_FN_IRQ:
return "IRQ";
case WM8994_GP_FN_TEMPERATURE:
return "Temperature";
case WM8994_GP_FN_MICBIAS1_DET:
return "MICBIAS1 detect";
case WM8994_GP_FN_MICBIAS1_SHORT:
return "MICBIAS1 short";
case WM8994_GP_FN_MICBIAS2_DET:
return "MICBIAS2 detect";
case WM8994_GP_FN_MICBIAS2_SHORT:
return "MICBIAS2 short";
case WM8994_GP_FN_FLL1_LOCK:
return "FLL1 lock";
case WM8994_GP_FN_FLL2_LOCK:
return "FLL2 lock";
case WM8994_GP_FN_SRC1_LOCK:
return "SRC1 lock";
case WM8994_GP_FN_SRC2_LOCK:
return "SRC2 lock";
case WM8994_GP_FN_DRC1_ACT:
return "DRC1 activity";
case WM8994_GP_FN_DRC2_ACT:
return "DRC2 activity";
case WM8994_GP_FN_DRC3_ACT:
return "DRC3 activity";
case WM8994_GP_FN_WSEQ_STATUS:
return "Write sequencer";
case WM8994_GP_FN_FIFO_ERROR:
return "FIFO error";
case WM8994_GP_FN_OPCLK:
return "OPCLK";
case WM8994_GP_FN_THW:
return "Thermal warning";
case WM8994_GP_FN_DCS_DONE:
return "DC servo";
case WM8994_GP_FN_FLL1_OUT:
return "FLL1 output";
case WM8994_GP_FN_FLL2_OUT:
return "FLL1 output";
default:
return "Unknown";
}
}
static void wm8994_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
{
struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);
struct wm8994 *wm8994 = wm8994_gpio->wm8994;
int i;
for (i = 0; i < chip->ngpio; i++) {
int gpio = i + chip->base;
int reg;
const char *label;
/* We report the GPIO even if it's not requested since
* we're also reporting things like alternate
* functions which apply even when the GPIO is not in
* use as a GPIO.
*/
label = gpiochip_is_requested(chip, i);
if (!label)
label = "Unrequested";
seq_printf(s, " gpio-%-3d (%-20.20s) ", gpio, label);
reg = wm8994_reg_read(wm8994, WM8994_GPIO_1 + i);
if (reg < 0) {
dev_err(wm8994->dev,
"GPIO control %d read failed: %d\n",
gpio, reg);
seq_printf(s, "\n");
continue;
}
if (reg & WM8994_GPN_DIR)
seq_printf(s, "in ");
else
seq_printf(s, "out ");
if (reg & WM8994_GPN_PU)
seq_printf(s, "pull up ");
if (reg & WM8994_GPN_PD)
seq_printf(s, "pull down ");
if (reg & WM8994_GPN_POL)
seq_printf(s, "inverted ");
else
seq_printf(s, "noninverted ");
if (reg & WM8994_GPN_OP_CFG)
seq_printf(s, "open drain ");
else
seq_printf(s, "push-pull ");
seq_printf(s, "%s (%x)\n",
wm8994_gpio_fn(reg & WM8994_GPN_FN_MASK), reg);
}
}
#else
#define wm8994_gpio_dbg_show NULL
#endif
static const struct gpio_chip template_chip = {
.label = "wm8994",
.owner = THIS_MODULE,
.request = wm8994_gpio_request,
.direction_input = wm8994_gpio_direction_in,
.get = wm8994_gpio_get,
.direction_output = wm8994_gpio_direction_out,
.set = wm8994_gpio_set,
.set_config = wm8994_gpio_set_config,
.to_irq = wm8994_gpio_to_irq,
.dbg_show = wm8994_gpio_dbg_show,
.can_sleep = true,
};
static int wm8994_gpio_probe(struct platform_device *pdev)
{
struct wm8994 *wm8994 = dev_get_drvdata(pdev->dev.parent);
struct wm8994_pdata *pdata = dev_get_platdata(wm8994->dev);
struct wm8994_gpio *wm8994_gpio;
wm8994_gpio = devm_kzalloc(&pdev->dev, sizeof(*wm8994_gpio),
GFP_KERNEL);
if (wm8994_gpio == NULL)
return -ENOMEM;
wm8994_gpio->wm8994 = wm8994;
wm8994_gpio->gpio_chip = template_chip;
wm8994_gpio->gpio_chip.ngpio = WM8994_GPIO_MAX;
wm8994_gpio->gpio_chip.parent = &pdev->dev;
if (pdata && pdata->gpio_base)
wm8994_gpio->gpio_chip.base = pdata->gpio_base;
else
wm8994_gpio->gpio_chip.base = -1;
return devm_gpiochip_add_data(&pdev->dev, &wm8994_gpio->gpio_chip, wm8994_gpio);
}
static struct platform_driver wm8994_gpio_driver = {
.driver.name = "wm8994-gpio",
.probe = wm8994_gpio_probe,
};
static int __init wm8994_gpio_init(void)
{
return platform_driver_register(&wm8994_gpio_driver);
}
subsys_initcall(wm8994_gpio_init);
static void __exit wm8994_gpio_exit(void)
{
platform_driver_unregister(&wm8994_gpio_driver);
}
module_exit(wm8994_gpio_exit);
MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
MODULE_DESCRIPTION("GPIO interface for WM8994");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:wm8994-gpio");
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