| /* |
| * 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/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, 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, 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; |
| } |
| |
| #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, |
| .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"); |