315 lines
7.4 KiB
C
315 lines
7.4 KiB
C
/*
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* gpiolib support for Wolfson WM8994
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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/regmap.h>
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#include <linux/mfd/wm8994/core.h>
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#include <linux/mfd/wm8994/pdata.h>
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#include <linux/mfd/wm8994/gpio.h>
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#include <linux/mfd/wm8994/registers.h>
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struct wm8994_gpio {
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struct wm8994 *wm8994;
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struct gpio_chip gpio_chip;
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};
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static inline struct wm8994_gpio *to_wm8994_gpio(struct gpio_chip *chip)
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{
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return container_of(chip, struct wm8994_gpio, gpio_chip);
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}
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static int wm8994_gpio_request(struct gpio_chip *chip, unsigned offset)
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{
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struct wm8994_gpio *wm8994_gpio = to_wm8994_gpio(chip);
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struct wm8994 *wm8994 = wm8994_gpio->wm8994;
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switch (wm8994->type) {
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case WM8958:
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switch (offset) {
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case 1:
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case 2:
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case 3:
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case 4:
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case 6:
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return -EINVAL;
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}
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break;
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default:
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break;
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}
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return 0;
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}
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static int wm8994_gpio_direction_in(struct gpio_chip *chip, unsigned offset)
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{
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struct wm8994_gpio *wm8994_gpio = to_wm8994_gpio(chip);
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struct wm8994 *wm8994 = wm8994_gpio->wm8994;
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return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset,
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WM8994_GPN_DIR, WM8994_GPN_DIR);
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}
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static int wm8994_gpio_get(struct gpio_chip *chip, unsigned offset)
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{
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struct wm8994_gpio *wm8994_gpio = to_wm8994_gpio(chip);
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struct wm8994 *wm8994 = wm8994_gpio->wm8994;
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int ret;
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ret = wm8994_reg_read(wm8994, WM8994_GPIO_1 + offset);
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if (ret < 0)
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return ret;
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if (ret & WM8994_GPN_LVL)
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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 int wm8994_gpio_direction_out(struct gpio_chip *chip,
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unsigned offset, int value)
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{
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struct wm8994_gpio *wm8994_gpio = to_wm8994_gpio(chip);
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struct wm8994 *wm8994 = wm8994_gpio->wm8994;
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if (value)
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value = WM8994_GPN_LVL;
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return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset,
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WM8994_GPN_DIR | WM8994_GPN_LVL, value);
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}
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static void wm8994_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
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{
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struct wm8994_gpio *wm8994_gpio = to_wm8994_gpio(chip);
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struct wm8994 *wm8994 = wm8994_gpio->wm8994;
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if (value)
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value = WM8994_GPN_LVL;
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wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset, WM8994_GPN_LVL, value);
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}
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static int wm8994_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
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{
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struct wm8994_gpio *wm8994_gpio = to_wm8994_gpio(chip);
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struct wm8994 *wm8994 = wm8994_gpio->wm8994;
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return regmap_irq_get_virq(wm8994->irq_data, offset);
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}
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#ifdef CONFIG_DEBUG_FS
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static const char *wm8994_gpio_fn(u16 fn)
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{
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switch (fn) {
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case WM8994_GP_FN_PIN_SPECIFIC:
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return "pin-specific";
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case WM8994_GP_FN_GPIO:
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return "GPIO";
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case WM8994_GP_FN_SDOUT:
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return "SDOUT";
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case WM8994_GP_FN_IRQ:
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return "IRQ";
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case WM8994_GP_FN_TEMPERATURE:
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return "Temperature";
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case WM8994_GP_FN_MICBIAS1_DET:
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return "MICBIAS1 detect";
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case WM8994_GP_FN_MICBIAS1_SHORT:
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return "MICBIAS1 short";
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case WM8994_GP_FN_MICBIAS2_DET:
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return "MICBIAS2 detect";
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case WM8994_GP_FN_MICBIAS2_SHORT:
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return "MICBIAS2 short";
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case WM8994_GP_FN_FLL1_LOCK:
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return "FLL1 lock";
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case WM8994_GP_FN_FLL2_LOCK:
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return "FLL2 lock";
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case WM8994_GP_FN_SRC1_LOCK:
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return "SRC1 lock";
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case WM8994_GP_FN_SRC2_LOCK:
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return "SRC2 lock";
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case WM8994_GP_FN_DRC1_ACT:
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return "DRC1 activity";
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case WM8994_GP_FN_DRC2_ACT:
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return "DRC2 activity";
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case WM8994_GP_FN_DRC3_ACT:
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return "DRC3 activity";
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case WM8994_GP_FN_WSEQ_STATUS:
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return "Write sequencer";
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case WM8994_GP_FN_FIFO_ERROR:
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return "FIFO error";
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case WM8994_GP_FN_OPCLK:
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return "OPCLK";
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case WM8994_GP_FN_THW:
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return "Thermal warning";
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case WM8994_GP_FN_DCS_DONE:
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return "DC servo";
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case WM8994_GP_FN_FLL1_OUT:
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return "FLL1 output";
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case WM8994_GP_FN_FLL2_OUT:
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return "FLL1 output";
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default:
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return "Unknown";
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}
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}
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static void wm8994_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
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{
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struct wm8994_gpio *wm8994_gpio = to_wm8994_gpio(chip);
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struct wm8994 *wm8994 = wm8994_gpio->wm8994;
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int i;
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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;
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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 = wm8994_reg_read(wm8994, WM8994_GPIO_1 + i);
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if (reg < 0) {
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dev_err(wm8994->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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if (reg & WM8994_GPN_DIR)
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seq_printf(s, "in ");
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else
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seq_printf(s, "out ");
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if (reg & WM8994_GPN_PU)
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seq_printf(s, "pull up ");
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if (reg & WM8994_GPN_PD)
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seq_printf(s, "pull down ");
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if (reg & WM8994_GPN_POL)
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seq_printf(s, "inverted ");
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else
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seq_printf(s, "noninverted ");
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if (reg & WM8994_GPN_OP_CFG)
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seq_printf(s, "open drain ");
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else
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seq_printf(s, "CMOS ");
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seq_printf(s, "%s (%x)\n",
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wm8994_gpio_fn(reg & WM8994_GPN_FN_MASK), reg);
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}
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}
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#else
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#define wm8994_gpio_dbg_show NULL
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#endif
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static struct gpio_chip template_chip = {
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.label = "wm8994",
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.owner = THIS_MODULE,
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.request = wm8994_gpio_request,
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.direction_input = wm8994_gpio_direction_in,
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.get = wm8994_gpio_get,
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.direction_output = wm8994_gpio_direction_out,
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.set = wm8994_gpio_set,
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.to_irq = wm8994_gpio_to_irq,
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.dbg_show = wm8994_gpio_dbg_show,
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.can_sleep = true,
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};
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static int wm8994_gpio_probe(struct platform_device *pdev)
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{
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struct wm8994 *wm8994 = dev_get_drvdata(pdev->dev.parent);
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struct wm8994_pdata *pdata = dev_get_platdata(wm8994->dev);
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struct wm8994_gpio *wm8994_gpio;
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int ret;
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wm8994_gpio = devm_kzalloc(&pdev->dev, sizeof(*wm8994_gpio),
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GFP_KERNEL);
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if (wm8994_gpio == NULL)
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return -ENOMEM;
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wm8994_gpio->wm8994 = wm8994;
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wm8994_gpio->gpio_chip = template_chip;
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wm8994_gpio->gpio_chip.ngpio = WM8994_GPIO_MAX;
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wm8994_gpio->gpio_chip.dev = &pdev->dev;
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if (pdata && pdata->gpio_base)
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wm8994_gpio->gpio_chip.base = pdata->gpio_base;
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else
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wm8994_gpio->gpio_chip.base = -1;
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ret = gpiochip_add(&wm8994_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, wm8994_gpio);
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return ret;
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err:
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return ret;
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}
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static int wm8994_gpio_remove(struct platform_device *pdev)
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{
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struct wm8994_gpio *wm8994_gpio = platform_get_drvdata(pdev);
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gpiochip_remove(&wm8994_gpio->gpio_chip);
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return 0;
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}
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static struct platform_driver wm8994_gpio_driver = {
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.driver.name = "wm8994-gpio",
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.driver.owner = THIS_MODULE,
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.probe = wm8994_gpio_probe,
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.remove = wm8994_gpio_remove,
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};
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static int __init wm8994_gpio_init(void)
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{
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return platform_driver_register(&wm8994_gpio_driver);
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}
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subsys_initcall(wm8994_gpio_init);
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static void __exit wm8994_gpio_exit(void)
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{
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platform_driver_unregister(&wm8994_gpio_driver);
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}
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module_exit(wm8994_gpio_exit);
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MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
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MODULE_DESCRIPTION("GPIO interface for WM8994");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:wm8994-gpio");
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