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304 lines
7.3 KiB
304 lines
7.3 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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* 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 <[email protected]> |
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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/driver.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 int wm831x_gpio_direction_in(struct gpio_chip *chip, unsigned offset) |
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{ |
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struct wm831x_gpio *wm831x_gpio = gpiochip_get_data(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 = gpiochip_get_data(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 = gpiochip_get_data(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 = gpiochip_get_data(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 = gpiochip_get_data(chip); |
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struct wm831x *wm831x = wm831x_gpio->wm831x; |
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return irq_create_mapping(wm831x->irq_domain, |
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WM831X_IRQ_GPIO_1 + offset); |
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} |
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static int wm831x_gpio_set_debounce(struct wm831x *wm831x, unsigned offset, |
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unsigned debounce) |
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{ |
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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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static int wm831x_set_config(struct gpio_chip *chip, unsigned int offset, |
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unsigned long config) |
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{ |
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struct wm831x_gpio *wm831x_gpio = gpiochip_get_data(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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switch (pinconf_to_config_param(config)) { |
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case PIN_CONFIG_DRIVE_OPEN_DRAIN: |
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return wm831x_set_bits(wm831x, reg, |
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WM831X_GPN_OD_MASK, WM831X_GPN_OD); |
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case PIN_CONFIG_DRIVE_PUSH_PULL: |
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return wm831x_set_bits(wm831x, reg, |
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WM831X_GPN_OD_MASK, 0); |
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case PIN_CONFIG_INPUT_DEBOUNCE: |
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return wm831x_gpio_set_debounce(wm831x, offset, |
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pinconf_to_config_argument(config)); |
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default: |
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break; |
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} |
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return -ENOTSUPP; |
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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 = gpiochip_get_data(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_putc(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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break; |
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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" : "push-pull", |
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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 const 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_config = wm831x_set_config, |
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.dbg_show = wm831x_gpio_dbg_show, |
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.can_sleep = true, |
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}; |
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static int 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->pdata; |
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struct wm831x_gpio *wm831x_gpio; |
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device_set_node(&pdev->dev, dev_fwnode(pdev->dev.parent)); |
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wm831x_gpio = devm_kzalloc(&pdev->dev, sizeof(*wm831x_gpio), |
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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.parent = &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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return devm_gpiochip_add_data(&pdev->dev, &wm831x_gpio->gpio_chip, wm831x_gpio); |
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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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.probe = wm831x_gpio_probe, |
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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 <[email protected]>"); |
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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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