// SPDX-License-Identifier: GPL-2.0+ /* * gpiolib support for Wolfson WM8994 * * Copyright 2009 Wolfson Microelectronics PLC. * * Author: Mark Brown <broonie@opensource.wolfsonmicro.com> * */ #include <linux/kernel.h> #include <linux/slab.h> #include <linux/module.h> #include <linux/gpio/driver.h> #include <linux/mfd/core.h> #include <linux/platform_device.h> #include <linux/seq_file.h> #include <linux/regmap.h> #include <linux/mfd/wm8994/core.h> #include <linux/mfd/wm8994/pdata.h> #include <linux/mfd/wm8994/gpio.h> #include <linux/mfd/wm8994/registers.h> struct wm8994_gpio { struct wm8994 *wm8994; struct gpio_chip gpio_chip; }; static int wm8994_gpio_request(struct gpio_chip *chip, unsigned offset) { struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip); struct wm8994 *wm8994 = wm8994_gpio->wm8994; switch (wm8994->type) { case WM8958: switch (offset) { case 1: case 2: case 3: case 4: case 6: return -EINVAL; } break; default: break; } return 0; } static int wm8994_gpio_direction_in(struct gpio_chip *chip, unsigned offset) { struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip); struct wm8994 *wm8994 = wm8994_gpio->wm8994; return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset, WM8994_GPN_DIR, WM8994_GPN_DIR); } static int wm8994_gpio_get(struct gpio_chip *chip, unsigned offset) { struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip); struct wm8994 *wm8994 = wm8994_gpio->wm8994; int ret; ret = wm8994_reg_read(wm8994, WM8994_GPIO_1 + offset); if (ret < 0) return ret; if (ret & WM8994_GPN_LVL) return 1; else return 0; } static int wm8994_gpio_direction_out(struct gpio_chip *chip, unsigned offset, int value) { struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip); struct wm8994 *wm8994 = wm8994_gpio->wm8994; if (value) value = WM8994_GPN_LVL; return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset, WM8994_GPN_DIR | WM8994_GPN_LVL, value); } static void wm8994_gpio_set(struct gpio_chip *chip, unsigned offset, int value) { struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip); struct wm8994 *wm8994 = wm8994_gpio->wm8994; if (value) value = WM8994_GPN_LVL; wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset, WM8994_GPN_LVL, value); } static int wm8994_gpio_set_config(struct gpio_chip *chip, unsigned int offset, unsigned long config) { struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip); struct wm8994 *wm8994 = wm8994_gpio->wm8994; switch (pinconf_to_config_param(config)) { case PIN_CONFIG_DRIVE_OPEN_DRAIN: return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset, WM8994_GPN_OP_CFG_MASK, WM8994_GPN_OP_CFG); case PIN_CONFIG_DRIVE_PUSH_PULL: return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset, WM8994_GPN_OP_CFG_MASK, 0); default: break; } return -ENOTSUPP; } static int wm8994_gpio_to_irq(struct gpio_chip *chip, unsigned offset) { struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip); struct wm8994 *wm8994 = wm8994_gpio->wm8994; return regmap_irq_get_virq(wm8994->irq_data, offset); } #ifdef CONFIG_DEBUG_FS static const char *wm8994_gpio_fn(u16 fn) { switch (fn) { case WM8994_GP_FN_PIN_SPECIFIC: return "pin-specific"; case WM8994_GP_FN_GPIO: return "GPIO"; case WM8994_GP_FN_SDOUT: return "SDOUT"; case WM8994_GP_FN_IRQ: return "IRQ"; case WM8994_GP_FN_TEMPERATURE: return "Temperature"; case WM8994_GP_FN_MICBIAS1_DET: return "MICBIAS1 detect"; case WM8994_GP_FN_MICBIAS1_SHORT: return "MICBIAS1 short"; case WM8994_GP_FN_MICBIAS2_DET: return "MICBIAS2 detect"; case WM8994_GP_FN_MICBIAS2_SHORT: return "MICBIAS2 short"; case WM8994_GP_FN_FLL1_LOCK: return "FLL1 lock"; case WM8994_GP_FN_FLL2_LOCK: return "FLL2 lock"; case WM8994_GP_FN_SRC1_LOCK: return "SRC1 lock"; case WM8994_GP_FN_SRC2_LOCK: return "SRC2 lock"; case WM8994_GP_FN_DRC1_ACT: return "DRC1 activity"; case WM8994_GP_FN_DRC2_ACT: return "DRC2 activity"; case WM8994_GP_FN_DRC3_ACT: return "DRC3 activity"; case WM8994_GP_FN_WSEQ_STATUS: return "Write sequencer"; case WM8994_GP_FN_FIFO_ERROR: return "FIFO error"; case WM8994_GP_FN_OPCLK: return "OPCLK"; case WM8994_GP_FN_THW: return "Thermal warning"; case WM8994_GP_FN_DCS_DONE: return "DC servo"; case WM8994_GP_FN_FLL1_OUT: return "FLL1 output"; case WM8994_GP_FN_FLL2_OUT: return "FLL1 output"; default: return "Unknown"; } } static void wm8994_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip) { struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip); struct wm8994 *wm8994 = wm8994_gpio->wm8994; int i; for (i = 0; i < chip->ngpio; i++) { int gpio = i + chip->base; int reg; const char *label; /* 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 = wm8994_reg_read(wm8994, WM8994_GPIO_1 + i); if (reg < 0) { dev_err(wm8994->dev, "GPIO control %d read failed: %d\n", gpio, reg); seq_printf(s, "\n"); continue; } if (reg & WM8994_GPN_DIR) seq_printf(s, "in "); else seq_printf(s, "out "); if (reg & WM8994_GPN_PU) seq_printf(s, "pull up "); if (reg & WM8994_GPN_PD) seq_printf(s, "pull down "); if (reg & WM8994_GPN_POL) seq_printf(s, "inverted "); else seq_printf(s, "noninverted "); if (reg & WM8994_GPN_OP_CFG) seq_printf(s, "open drain "); else seq_printf(s, "push-pull "); seq_printf(s, "%s (%x)\n", wm8994_gpio_fn(reg & WM8994_GPN_FN_MASK), reg); } } #else #define wm8994_gpio_dbg_show NULL #endif static const struct gpio_chip template_chip = { .label = "wm8994", .owner = THIS_MODULE, .request = wm8994_gpio_request, .direction_input = wm8994_gpio_direction_in, .get = wm8994_gpio_get, .direction_output = wm8994_gpio_direction_out, .set = wm8994_gpio_set, .set_config = wm8994_gpio_set_config, .to_irq = wm8994_gpio_to_irq, .dbg_show = wm8994_gpio_dbg_show, .can_sleep = true, }; static int wm8994_gpio_probe(struct platform_device *pdev) { struct wm8994 *wm8994 = dev_get_drvdata(pdev->dev.parent); struct wm8994_pdata *pdata = dev_get_platdata(wm8994->dev); struct wm8994_gpio *wm8994_gpio; wm8994_gpio = devm_kzalloc(&pdev->dev, sizeof(*wm8994_gpio), GFP_KERNEL); if (wm8994_gpio == NULL) return -ENOMEM; wm8994_gpio->wm8994 = wm8994; wm8994_gpio->gpio_chip = template_chip; wm8994_gpio->gpio_chip.ngpio = WM8994_GPIO_MAX; wm8994_gpio->gpio_chip.parent = &pdev->dev; if (pdata && pdata->gpio_base) wm8994_gpio->gpio_chip.base = pdata->gpio_base; else wm8994_gpio->gpio_chip.base = -1; return devm_gpiochip_add_data(&pdev->dev, &wm8994_gpio->gpio_chip, wm8994_gpio); } static struct platform_driver wm8994_gpio_driver = { .driver.name = "wm8994-gpio", .probe = wm8994_gpio_probe, }; static int __init wm8994_gpio_init(void) { return platform_driver_register(&wm8994_gpio_driver); } subsys_initcall(wm8994_gpio_init); static void __exit wm8994_gpio_exit(void) { platform_driver_unregister(&wm8994_gpio_driver); } module_exit(wm8994_gpio_exit); MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); MODULE_DESCRIPTION("GPIO interface for WM8994"); MODULE_LICENSE("GPL"); MODULE_ALIAS("platform:wm8994-gpio");