318 lines
7.5 KiB
C
318 lines
7.5 KiB
C
/*
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* wm831x-gpio.c -- gpiolib support for Wolfson WM831x PMICs
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*
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* Copyright 2009 Wolfson Microelectronics PLC.
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*
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* Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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*/
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/gpio.h>
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#include <linux/mfd/core.h>
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#include <linux/platform_device.h>
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#include <linux/seq_file.h>
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#include <linux/mfd/wm831x/core.h>
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#include <linux/mfd/wm831x/pdata.h>
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#include <linux/mfd/wm831x/gpio.h>
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#include <linux/mfd/wm831x/irq.h>
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struct wm831x_gpio {
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struct wm831x *wm831x;
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struct gpio_chip gpio_chip;
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};
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static inline struct wm831x_gpio *to_wm831x_gpio(struct gpio_chip *chip)
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{
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return container_of(chip, struct wm831x_gpio, gpio_chip);
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}
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static int wm831x_gpio_direction_in(struct gpio_chip *chip, unsigned offset)
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{
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struct wm831x_gpio *wm831x_gpio = to_wm831x_gpio(chip);
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struct wm831x *wm831x = wm831x_gpio->wm831x;
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int val = WM831X_GPN_DIR;
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if (wm831x->has_gpio_ena)
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val |= WM831X_GPN_TRI;
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return wm831x_set_bits(wm831x, WM831X_GPIO1_CONTROL + offset,
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WM831X_GPN_DIR | WM831X_GPN_TRI |
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WM831X_GPN_FN_MASK, val);
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}
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static int wm831x_gpio_get(struct gpio_chip *chip, unsigned offset)
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{
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struct wm831x_gpio *wm831x_gpio = to_wm831x_gpio(chip);
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struct wm831x *wm831x = wm831x_gpio->wm831x;
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int ret;
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ret = wm831x_reg_read(wm831x, WM831X_GPIO_LEVEL);
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if (ret < 0)
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return ret;
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if (ret & 1 << offset)
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return 1;
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else
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return 0;
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}
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static void wm831x_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
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{
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struct wm831x_gpio *wm831x_gpio = to_wm831x_gpio(chip);
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struct wm831x *wm831x = wm831x_gpio->wm831x;
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wm831x_set_bits(wm831x, WM831X_GPIO_LEVEL, 1 << offset,
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value << offset);
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}
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static int wm831x_gpio_direction_out(struct gpio_chip *chip,
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unsigned offset, int value)
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{
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struct wm831x_gpio *wm831x_gpio = to_wm831x_gpio(chip);
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struct wm831x *wm831x = wm831x_gpio->wm831x;
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int val = 0;
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int ret;
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if (wm831x->has_gpio_ena)
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val |= WM831X_GPN_TRI;
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ret = wm831x_set_bits(wm831x, WM831X_GPIO1_CONTROL + offset,
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WM831X_GPN_DIR | WM831X_GPN_TRI |
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WM831X_GPN_FN_MASK, val);
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if (ret < 0)
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return ret;
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/* Can only set GPIO state once it's in output mode */
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wm831x_gpio_set(chip, offset, value);
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return 0;
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}
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static int wm831x_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
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{
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struct wm831x_gpio *wm831x_gpio = to_wm831x_gpio(chip);
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struct wm831x *wm831x = wm831x_gpio->wm831x;
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if (!wm831x->irq_base)
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return -EINVAL;
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return wm831x->irq_base + WM831X_IRQ_GPIO_1 + offset;
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}
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static int wm831x_gpio_set_debounce(struct gpio_chip *chip, unsigned offset,
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unsigned debounce)
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{
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struct wm831x_gpio *wm831x_gpio = to_wm831x_gpio(chip);
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struct wm831x *wm831x = wm831x_gpio->wm831x;
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int reg = WM831X_GPIO1_CONTROL + offset;
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int ret, fn;
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ret = wm831x_reg_read(wm831x, reg);
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if (ret < 0)
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return ret;
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switch (ret & WM831X_GPN_FN_MASK) {
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case 0:
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case 1:
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break;
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default:
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/* Not in GPIO mode */
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return -EBUSY;
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}
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if (debounce >= 32 && debounce <= 64)
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fn = 0;
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else if (debounce >= 4000 && debounce <= 8000)
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fn = 1;
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else
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return -EINVAL;
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return wm831x_set_bits(wm831x, reg, WM831X_GPN_FN_MASK, fn);
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}
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#ifdef CONFIG_DEBUG_FS
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static void wm831x_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
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{
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struct wm831x_gpio *wm831x_gpio = to_wm831x_gpio(chip);
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struct wm831x *wm831x = wm831x_gpio->wm831x;
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int i, tristated;
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for (i = 0; i < chip->ngpio; i++) {
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int gpio = i + chip->base;
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int reg;
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const char *label, *pull, *powerdomain;
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/* We report the GPIO even if it's not requested since
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* we're also reporting things like alternate
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* functions which apply even when the GPIO is not in
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* use as a GPIO.
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*/
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label = gpiochip_is_requested(chip, i);
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if (!label)
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label = "Unrequested";
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seq_printf(s, " gpio-%-3d (%-20.20s) ", gpio, label);
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reg = wm831x_reg_read(wm831x, WM831X_GPIO1_CONTROL + i);
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if (reg < 0) {
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dev_err(wm831x->dev,
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"GPIO control %d read failed: %d\n",
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gpio, reg);
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seq_printf(s, "\n");
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continue;
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}
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switch (reg & WM831X_GPN_PULL_MASK) {
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case WM831X_GPIO_PULL_NONE:
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pull = "nopull";
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break;
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case WM831X_GPIO_PULL_DOWN:
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pull = "pulldown";
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break;
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case WM831X_GPIO_PULL_UP:
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pull = "pullup";
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default:
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pull = "INVALID PULL";
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break;
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}
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switch (i + 1) {
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case 1 ... 3:
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case 7 ... 9:
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if (reg & WM831X_GPN_PWR_DOM)
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powerdomain = "VPMIC";
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else
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powerdomain = "DBVDD";
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break;
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case 4 ... 6:
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case 10 ... 12:
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if (reg & WM831X_GPN_PWR_DOM)
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powerdomain = "SYSVDD";
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else
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powerdomain = "DBVDD";
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break;
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case 13 ... 16:
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powerdomain = "TPVDD";
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break;
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default:
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BUG();
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break;
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}
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tristated = reg & WM831X_GPN_TRI;
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if (wm831x->has_gpio_ena)
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tristated = !tristated;
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seq_printf(s, " %s %s %s %s%s\n"
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" %s%s (0x%4x)\n",
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reg & WM831X_GPN_DIR ? "in" : "out",
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wm831x_gpio_get(chip, i) ? "high" : "low",
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pull,
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powerdomain,
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reg & WM831X_GPN_POL ? "" : " inverted",
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reg & WM831X_GPN_OD ? "open-drain" : "CMOS",
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tristated ? " tristated" : "",
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reg);
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}
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}
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#else
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#define wm831x_gpio_dbg_show NULL
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#endif
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static struct gpio_chip template_chip = {
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.label = "wm831x",
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.owner = THIS_MODULE,
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.direction_input = wm831x_gpio_direction_in,
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.get = wm831x_gpio_get,
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.direction_output = wm831x_gpio_direction_out,
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.set = wm831x_gpio_set,
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.to_irq = wm831x_gpio_to_irq,
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.set_debounce = wm831x_gpio_set_debounce,
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.dbg_show = wm831x_gpio_dbg_show,
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.can_sleep = 1,
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};
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static int __devinit wm831x_gpio_probe(struct platform_device *pdev)
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{
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struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
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struct wm831x_pdata *pdata = wm831x->dev->platform_data;
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struct wm831x_gpio *wm831x_gpio;
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int ret;
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wm831x_gpio = kzalloc(sizeof(*wm831x_gpio), GFP_KERNEL);
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if (wm831x_gpio == NULL)
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return -ENOMEM;
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wm831x_gpio->wm831x = wm831x;
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wm831x_gpio->gpio_chip = template_chip;
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wm831x_gpio->gpio_chip.ngpio = wm831x->num_gpio;
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wm831x_gpio->gpio_chip.dev = &pdev->dev;
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if (pdata && pdata->gpio_base)
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wm831x_gpio->gpio_chip.base = pdata->gpio_base;
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else
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wm831x_gpio->gpio_chip.base = -1;
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ret = gpiochip_add(&wm831x_gpio->gpio_chip);
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if (ret < 0) {
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dev_err(&pdev->dev, "Could not register gpiochip, %d\n",
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ret);
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goto err;
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}
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platform_set_drvdata(pdev, wm831x_gpio);
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return ret;
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err:
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kfree(wm831x_gpio);
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return ret;
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}
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static int __devexit wm831x_gpio_remove(struct platform_device *pdev)
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{
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struct wm831x_gpio *wm831x_gpio = platform_get_drvdata(pdev);
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int ret;
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ret = gpiochip_remove(&wm831x_gpio->gpio_chip);
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if (ret == 0)
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kfree(wm831x_gpio);
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return ret;
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}
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static struct platform_driver wm831x_gpio_driver = {
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.driver.name = "wm831x-gpio",
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.driver.owner = THIS_MODULE,
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.probe = wm831x_gpio_probe,
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.remove = __devexit_p(wm831x_gpio_remove),
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};
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static int __init wm831x_gpio_init(void)
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{
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return platform_driver_register(&wm831x_gpio_driver);
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}
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subsys_initcall(wm831x_gpio_init);
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static void __exit wm831x_gpio_exit(void)
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{
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platform_driver_unregister(&wm831x_gpio_driver);
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}
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module_exit(wm831x_gpio_exit);
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MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
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MODULE_DESCRIPTION("GPIO interface for WM831x PMICs");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:wm831x-gpio");
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