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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 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 <[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/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 int wm8994_gpio_request(struct gpio_chip *chip, unsigned offset) |
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{ |
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struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(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 = gpiochip_get_data(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 = gpiochip_get_data(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 = gpiochip_get_data(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 = gpiochip_get_data(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_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 wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip); |
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struct wm8994 *wm8994 = wm8994_gpio->wm8994; |
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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 wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset, |
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WM8994_GPN_OP_CFG_MASK, |
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WM8994_GPN_OP_CFG); |
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case PIN_CONFIG_DRIVE_PUSH_PULL: |
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return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset, |
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WM8994_GPN_OP_CFG_MASK, 0); |
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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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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 = gpiochip_get_data(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 = gpiochip_get_data(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, "push-pull "); |
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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 const 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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.set_config = wm8994_gpio_set_config, |
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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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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.parent = &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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return devm_gpiochip_add_data(&pdev->dev, &wm8994_gpio->gpio_chip, wm8994_gpio); |
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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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.probe = wm8994_gpio_probe, |
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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 <[email protected]>"); |
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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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