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path: root/drivers/gpio/wm831x-gpio.c
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Diffstat (limited to 'drivers/gpio/wm831x-gpio.c')
-rw-r--r--drivers/gpio/wm831x-gpio.c317
1 files changed, 0 insertions, 317 deletions
diff --git a/drivers/gpio/wm831x-gpio.c b/drivers/gpio/wm831x-gpio.c
deleted file mode 100644
index 309644cf4d9..00000000000
--- a/drivers/gpio/wm831x-gpio.c
+++ /dev/null
@@ -1,317 +0,0 @@
-/*
- * wm831x-gpio.c -- gpiolib support for Wolfson WM831x PMICs
- *
- * Copyright 2009 Wolfson Microelectronics PLC.
- *
- * Author: Mark Brown <broonie@opensource.wolfsonmicro.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; either version 2 of the License, or (at your
- * option) any later version.
- *
- */
-
-#include <linux/kernel.h>
-#include <linux/slab.h>
-#include <linux/module.h>
-#include <linux/gpio.h>
-#include <linux/mfd/core.h>
-#include <linux/platform_device.h>
-#include <linux/seq_file.h>
-
-#include <linux/mfd/wm831x/core.h>
-#include <linux/mfd/wm831x/pdata.h>
-#include <linux/mfd/wm831x/gpio.h>
-#include <linux/mfd/wm831x/irq.h>
-
-struct wm831x_gpio {
- struct wm831x *wm831x;
- struct gpio_chip gpio_chip;
-};
-
-static inline struct wm831x_gpio *to_wm831x_gpio(struct gpio_chip *chip)
-{
- return container_of(chip, struct wm831x_gpio, gpio_chip);
-}
-
-static int wm831x_gpio_direction_in(struct gpio_chip *chip, unsigned offset)
-{
- struct wm831x_gpio *wm831x_gpio = to_wm831x_gpio(chip);
- struct wm831x *wm831x = wm831x_gpio->wm831x;
- int val = WM831X_GPN_DIR;
-
- if (wm831x->has_gpio_ena)
- val |= WM831X_GPN_TRI;
-
- return wm831x_set_bits(wm831x, WM831X_GPIO1_CONTROL + offset,
- WM831X_GPN_DIR | WM831X_GPN_TRI |
- WM831X_GPN_FN_MASK, val);
-}
-
-static int wm831x_gpio_get(struct gpio_chip *chip, unsigned offset)
-{
- struct wm831x_gpio *wm831x_gpio = to_wm831x_gpio(chip);
- struct wm831x *wm831x = wm831x_gpio->wm831x;
- int ret;
-
- ret = wm831x_reg_read(wm831x, WM831X_GPIO_LEVEL);
- if (ret < 0)
- return ret;
-
- if (ret & 1 << offset)
- return 1;
- else
- return 0;
-}
-
-static void wm831x_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
-{
- struct wm831x_gpio *wm831x_gpio = to_wm831x_gpio(chip);
- struct wm831x *wm831x = wm831x_gpio->wm831x;
-
- wm831x_set_bits(wm831x, WM831X_GPIO_LEVEL, 1 << offset,
- value << offset);
-}
-
-static int wm831x_gpio_direction_out(struct gpio_chip *chip,
- unsigned offset, int value)
-{
- struct wm831x_gpio *wm831x_gpio = to_wm831x_gpio(chip);
- struct wm831x *wm831x = wm831x_gpio->wm831x;
- int val = 0;
- int ret;
-
- if (wm831x->has_gpio_ena)
- val |= WM831X_GPN_TRI;
-
- ret = wm831x_set_bits(wm831x, WM831X_GPIO1_CONTROL + offset,
- WM831X_GPN_DIR | WM831X_GPN_TRI |
- WM831X_GPN_FN_MASK, val);
- if (ret < 0)
- return ret;
-
- /* Can only set GPIO state once it's in output mode */
- wm831x_gpio_set(chip, offset, value);
-
- return 0;
-}
-
-static int wm831x_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
-{
- struct wm831x_gpio *wm831x_gpio = to_wm831x_gpio(chip);
- struct wm831x *wm831x = wm831x_gpio->wm831x;
-
- if (!wm831x->irq_base)
- return -EINVAL;
-
- return wm831x->irq_base + WM831X_IRQ_GPIO_1 + offset;
-}
-
-static int wm831x_gpio_set_debounce(struct gpio_chip *chip, unsigned offset,
- unsigned debounce)
-{
- struct wm831x_gpio *wm831x_gpio = to_wm831x_gpio(chip);
- struct wm831x *wm831x = wm831x_gpio->wm831x;
- int reg = WM831X_GPIO1_CONTROL + offset;
- int ret, fn;
-
- ret = wm831x_reg_read(wm831x, reg);
- if (ret < 0)
- return ret;
-
- switch (ret & WM831X_GPN_FN_MASK) {
- case 0:
- case 1:
- break;
- default:
- /* Not in GPIO mode */
- return -EBUSY;
- }
-
- if (debounce >= 32 && debounce <= 64)
- fn = 0;
- else if (debounce >= 4000 && debounce <= 8000)
- fn = 1;
- else
- return -EINVAL;
-
- return wm831x_set_bits(wm831x, reg, WM831X_GPN_FN_MASK, fn);
-}
-
-#ifdef CONFIG_DEBUG_FS
-static void wm831x_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
-{
- struct wm831x_gpio *wm831x_gpio = to_wm831x_gpio(chip);
- struct wm831x *wm831x = wm831x_gpio->wm831x;
- int i, tristated;
-
- for (i = 0; i < chip->ngpio; i++) {
- int gpio = i + chip->base;
- int reg;
- const char *label, *pull, *powerdomain;
-
- /* 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 = wm831x_reg_read(wm831x, WM831X_GPIO1_CONTROL + i);
- if (reg < 0) {
- dev_err(wm831x->dev,
- "GPIO control %d read failed: %d\n",
- gpio, reg);
- seq_printf(s, "\n");
- continue;
- }
-
- switch (reg & WM831X_GPN_PULL_MASK) {
- case WM831X_GPIO_PULL_NONE:
- pull = "nopull";
- break;
- case WM831X_GPIO_PULL_DOWN:
- pull = "pulldown";
- break;
- case WM831X_GPIO_PULL_UP:
- pull = "pullup";
- default:
- pull = "INVALID PULL";
- break;
- }
-
- switch (i + 1) {
- case 1 ... 3:
- case 7 ... 9:
- if (reg & WM831X_GPN_PWR_DOM)
- powerdomain = "VPMIC";
- else
- powerdomain = "DBVDD";
- break;
-
- case 4 ... 6:
- case 10 ... 12:
- if (reg & WM831X_GPN_PWR_DOM)
- powerdomain = "SYSVDD";
- else
- powerdomain = "DBVDD";
- break;
-
- case 13 ... 16:
- powerdomain = "TPVDD";
- break;
-
- default:
- BUG();
- break;
- }
-
- tristated = reg & WM831X_GPN_TRI;
- if (wm831x->has_gpio_ena)
- tristated = !tristated;
-
- seq_printf(s, " %s %s %s %s%s\n"
- " %s%s (0x%4x)\n",
- reg & WM831X_GPN_DIR ? "in" : "out",
- wm831x_gpio_get(chip, i) ? "high" : "low",
- pull,
- powerdomain,
- reg & WM831X_GPN_POL ? "" : " inverted",
- reg & WM831X_GPN_OD ? "open-drain" : "CMOS",
- tristated ? " tristated" : "",
- reg);
- }
-}
-#else
-#define wm831x_gpio_dbg_show NULL
-#endif
-
-static struct gpio_chip template_chip = {
- .label = "wm831x",
- .owner = THIS_MODULE,
- .direction_input = wm831x_gpio_direction_in,
- .get = wm831x_gpio_get,
- .direction_output = wm831x_gpio_direction_out,
- .set = wm831x_gpio_set,
- .to_irq = wm831x_gpio_to_irq,
- .set_debounce = wm831x_gpio_set_debounce,
- .dbg_show = wm831x_gpio_dbg_show,
- .can_sleep = 1,
-};
-
-static int __devinit wm831x_gpio_probe(struct platform_device *pdev)
-{
- struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
- struct wm831x_pdata *pdata = wm831x->dev->platform_data;
- struct wm831x_gpio *wm831x_gpio;
- int ret;
-
- wm831x_gpio = kzalloc(sizeof(*wm831x_gpio), GFP_KERNEL);
- if (wm831x_gpio == NULL)
- return -ENOMEM;
-
- wm831x_gpio->wm831x = wm831x;
- wm831x_gpio->gpio_chip = template_chip;
- wm831x_gpio->gpio_chip.ngpio = wm831x->num_gpio;
- wm831x_gpio->gpio_chip.dev = &pdev->dev;
- if (pdata && pdata->gpio_base)
- wm831x_gpio->gpio_chip.base = pdata->gpio_base;
- else
- wm831x_gpio->gpio_chip.base = -1;
-
- ret = gpiochip_add(&wm831x_gpio->gpio_chip);
- if (ret < 0) {
- dev_err(&pdev->dev, "Could not register gpiochip, %d\n",
- ret);
- goto err;
- }
-
- platform_set_drvdata(pdev, wm831x_gpio);
-
- return ret;
-
-err:
- kfree(wm831x_gpio);
- return ret;
-}
-
-static int __devexit wm831x_gpio_remove(struct platform_device *pdev)
-{
- struct wm831x_gpio *wm831x_gpio = platform_get_drvdata(pdev);
- int ret;
-
- ret = gpiochip_remove(&wm831x_gpio->gpio_chip);
- if (ret == 0)
- kfree(wm831x_gpio);
-
- return ret;
-}
-
-static struct platform_driver wm831x_gpio_driver = {
- .driver.name = "wm831x-gpio",
- .driver.owner = THIS_MODULE,
- .probe = wm831x_gpio_probe,
- .remove = __devexit_p(wm831x_gpio_remove),
-};
-
-static int __init wm831x_gpio_init(void)
-{
- return platform_driver_register(&wm831x_gpio_driver);
-}
-subsys_initcall(wm831x_gpio_init);
-
-static void __exit wm831x_gpio_exit(void)
-{
- platform_driver_unregister(&wm831x_gpio_driver);
-}
-module_exit(wm831x_gpio_exit);
-
-MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
-MODULE_DESCRIPTION("GPIO interface for WM831x PMICs");
-MODULE_LICENSE("GPL");
-MODULE_ALIAS("platform:wm831x-gpio");
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-04 01:42:31 +0000