1124144Sphk// SPDX-License-Identifier: GPL-2.0+ 2124144Sphk/* 3124144Sphk * gpiolib support for Wolfson WM8994 4124144Sphk * 5139788Simp * Copyright 2009 Wolfson Microelectronics PLC. 6139788Simp * 7139788Simp * Author: Mark Brown <broonie@opensource.wolfsonmicro.com> 8139788Simp * 9139788Simp */ 10139788Simp 11139788Simp#include <linux/cleanup.h> 12139788Simp#include <linux/kernel.h> 13124144Sphk#include <linux/slab.h> 14139788Simp#include <linux/module.h> 15139788Simp#include <linux/gpio/driver.h> 16139788Simp#include <linux/mfd/core.h> 17139788Simp#include <linux/platform_device.h> 18139788Simp#include <linux/seq_file.h> 19139788Simp#include <linux/regmap.h> 20139788Simp 21139788Simp#include <linux/mfd/wm8994/core.h> 22139788Simp#include <linux/mfd/wm8994/pdata.h> 23139788Simp#include <linux/mfd/wm8994/gpio.h> 24139788Simp#include <linux/mfd/wm8994/registers.h> 25139788Simp 26139788Simpstruct wm8994_gpio { 27139788Simp struct wm8994 *wm8994; 28124144Sphk struct gpio_chip gpio_chip; 29124144Sphk}; 30124144Sphk 31124144Sphkstatic int wm8994_gpio_request(struct gpio_chip *chip, unsigned offset) 32124144Sphk{ 33124144Sphk struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip); 34124144Sphk struct wm8994 *wm8994 = wm8994_gpio->wm8994; 35124144Sphk 36124144Sphk switch (wm8994->type) { 37124144Sphk case WM8958: 38124144Sphk switch (offset) { 39124144Sphk case 1: 40124144Sphk case 2: 41124144Sphk case 3: 42124144Sphk case 4: 43124144Sphk case 6: 44124144Sphk return -EINVAL; 45124144Sphk } 46124144Sphk break; 47124144Sphk default: 48124144Sphk break; 49124144Sphk } 50124144Sphk 51124144Sphk return 0; 52124144Sphk} 53124144Sphk 54124144Sphkstatic int wm8994_gpio_direction_in(struct gpio_chip *chip, unsigned offset) 55124144Sphk{ 56124144Sphk struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip); 57124144Sphk struct wm8994 *wm8994 = wm8994_gpio->wm8994; 58124144Sphk 59124144Sphk return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset, 60124144Sphk WM8994_GPN_DIR, WM8994_GPN_DIR); 61124144Sphk} 62124144Sphk 63124144Sphkstatic int wm8994_gpio_get(struct gpio_chip *chip, unsigned offset) 64124144Sphk{ 65124144Sphk struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip); 66124144Sphk struct wm8994 *wm8994 = wm8994_gpio->wm8994; 67124144Sphk int ret; 68124144Sphk 69124144Sphk ret = wm8994_reg_read(wm8994, WM8994_GPIO_1 + offset); 70124144Sphk if (ret < 0) 71124144Sphk return ret; 72124144Sphk 73124144Sphk if (ret & WM8994_GPN_LVL) 74124144Sphk return 1; 75124144Sphk else 76124144Sphk return 0; 77124144Sphk} 78124144Sphk 79124144Sphkstatic int wm8994_gpio_direction_out(struct gpio_chip *chip, 80124144Sphk unsigned offset, int value) 81124144Sphk{ 82124144Sphk struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip); 83124144Sphk struct wm8994 *wm8994 = wm8994_gpio->wm8994; 84124144Sphk 85124144Sphk if (value) 86124144Sphk value = WM8994_GPN_LVL; 87124144Sphk 88124144Sphk return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset, 89124144Sphk WM8994_GPN_DIR | WM8994_GPN_LVL, value); 90124144Sphk} 91124144Sphk 92124144Sphkstatic void wm8994_gpio_set(struct gpio_chip *chip, unsigned offset, int value) 93124144Sphk{ 94124144Sphk struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip); 95124144Sphk struct wm8994 *wm8994 = wm8994_gpio->wm8994; 96124144Sphk 97124144Sphk if (value) 98124144Sphk value = WM8994_GPN_LVL; 99124144Sphk 100124144Sphk wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset, WM8994_GPN_LVL, value); 101124144Sphk} 102124144Sphk 103124144Sphkstatic int wm8994_gpio_set_config(struct gpio_chip *chip, unsigned int offset, 104124144Sphk unsigned long config) 105124144Sphk{ 106124144Sphk struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip); 107124144Sphk struct wm8994 *wm8994 = wm8994_gpio->wm8994; 108124144Sphk 109124144Sphk switch (pinconf_to_config_param(config)) { 110124144Sphk case PIN_CONFIG_DRIVE_OPEN_DRAIN: 111124144Sphk return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset, 112124144Sphk WM8994_GPN_OP_CFG_MASK, 113124144Sphk WM8994_GPN_OP_CFG); 114124144Sphk case PIN_CONFIG_DRIVE_PUSH_PULL: 115124144Sphk return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset, 116124144Sphk WM8994_GPN_OP_CFG_MASK, 0); 117124144Sphk default: 118124144Sphk break; 119124144Sphk } 120124144Sphk 121124144Sphk return -ENOTSUPP; 122124144Sphk} 123124144Sphk 124124144Sphkstatic int wm8994_gpio_to_irq(struct gpio_chip *chip, unsigned offset) 125124144Sphk{ 126124144Sphk struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip); 127124144Sphk struct wm8994 *wm8994 = wm8994_gpio->wm8994; 128124144Sphk 129124144Sphk return regmap_irq_get_virq(wm8994->irq_data, offset); 130124144Sphk} 131124144Sphk 132124144Sphk 133124144Sphk#ifdef CONFIG_DEBUG_FS 134124144Sphkstatic const char *wm8994_gpio_fn(u16 fn) 135124144Sphk{ 136124144Sphk switch (fn) { 137124144Sphk case WM8994_GP_FN_PIN_SPECIFIC: 138124144Sphk return "pin-specific"; 139124144Sphk case WM8994_GP_FN_GPIO: 140124144Sphk return "GPIO"; 141124144Sphk case WM8994_GP_FN_SDOUT: 142124144Sphk return "SDOUT"; 143124144Sphk case WM8994_GP_FN_IRQ: 144124144Sphk return "IRQ"; 145124144Sphk case WM8994_GP_FN_TEMPERATURE: 146124144Sphk return "Temperature"; 147124144Sphk case WM8994_GP_FN_MICBIAS1_DET: 148124144Sphk return "MICBIAS1 detect"; 149124144Sphk case WM8994_GP_FN_MICBIAS1_SHORT: 150124144Sphk return "MICBIAS1 short"; 151124144Sphk case WM8994_GP_FN_MICBIAS2_DET: 152124144Sphk return "MICBIAS2 detect"; 153124144Sphk case WM8994_GP_FN_MICBIAS2_SHORT: 154124144Sphk return "MICBIAS2 short"; 155124144Sphk case WM8994_GP_FN_FLL1_LOCK: 156124144Sphk return "FLL1 lock"; 157124144Sphk case WM8994_GP_FN_FLL2_LOCK: 158124144Sphk return "FLL2 lock"; 159124144Sphk case WM8994_GP_FN_SRC1_LOCK: 160124144Sphk return "SRC1 lock"; 161124144Sphk case WM8994_GP_FN_SRC2_LOCK: 162124144Sphk return "SRC2 lock"; 163124144Sphk case WM8994_GP_FN_DRC1_ACT: 164124144Sphk return "DRC1 activity"; 165124144Sphk case WM8994_GP_FN_DRC2_ACT: 166124144Sphk return "DRC2 activity"; 167124144Sphk case WM8994_GP_FN_DRC3_ACT: 168124144Sphk return "DRC3 activity"; 169124144Sphk case WM8994_GP_FN_WSEQ_STATUS: 170124144Sphk return "Write sequencer"; 171124144Sphk case WM8994_GP_FN_FIFO_ERROR: 172124144Sphk return "FIFO error"; 173124144Sphk case WM8994_GP_FN_OPCLK: 174124144Sphk return "OPCLK"; 175124144Sphk case WM8994_GP_FN_THW: 176124144Sphk return "Thermal warning"; 177124144Sphk case WM8994_GP_FN_DCS_DONE: 178124144Sphk return "DC servo"; 179124144Sphk case WM8994_GP_FN_FLL1_OUT: 180124144Sphk return "FLL1 output"; 181124144Sphk case WM8994_GP_FN_FLL2_OUT: 182124144Sphk return "FLL1 output"; 183124144Sphk default: 184124144Sphk return "Unknown"; 185124144Sphk } 186124144Sphk} 187124144Sphk 188124144Sphkstatic void wm8994_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip) 189124144Sphk{ 190124144Sphk struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip); 191124144Sphk struct wm8994 *wm8994 = wm8994_gpio->wm8994; 192124144Sphk int i; 193124144Sphk 194124144Sphk for (i = 0; i < chip->ngpio; i++) { 195124144Sphk int gpio = i + chip->base; 196124144Sphk int reg; 197124144Sphk 198124144Sphk /* We report the GPIO even if it's not requested since 199124144Sphk * we're also reporting things like alternate 200124144Sphk * functions which apply even when the GPIO is not in 201124144Sphk * use as a GPIO. 202124144Sphk */ 203124144Sphk char *label __free(kfree) = gpiochip_dup_line_label(chip, i); 204124144Sphk if (IS_ERR(label)) { 205124144Sphk dev_err(wm8994->dev, "Failed to duplicate label\n"); 206124144Sphk continue; 207124144Sphk } 208124144Sphk 209124144Sphk seq_printf(s, " gpio-%-3d (%-20.20s) ", gpio, 210124144Sphk label ?: "Unrequested"); 211124144Sphk 212124144Sphk reg = wm8994_reg_read(wm8994, WM8994_GPIO_1 + i); 213124144Sphk if (reg < 0) { 214124144Sphk dev_err(wm8994->dev, 215124144Sphk "GPIO control %d read failed: %d\n", 216124144Sphk gpio, reg); 217124144Sphk seq_printf(s, "\n"); 218124144Sphk continue; 219124144Sphk } 220124144Sphk 221124144Sphk if (reg & WM8994_GPN_DIR) 222124144Sphk seq_printf(s, "in "); 223124144Sphk else 224124144Sphk seq_printf(s, "out "); 225124144Sphk 226124144Sphk if (reg & WM8994_GPN_PU) 227124144Sphk seq_printf(s, "pull up "); 228124144Sphk 229124144Sphk if (reg & WM8994_GPN_PD) 230124144Sphk seq_printf(s, "pull down "); 231124144Sphk 232124144Sphk if (reg & WM8994_GPN_POL) 233124144Sphk seq_printf(s, "inverted "); 234124144Sphk else 235124144Sphk seq_printf(s, "noninverted "); 236124144Sphk 237124144Sphk if (reg & WM8994_GPN_OP_CFG) 238124144Sphk seq_printf(s, "open drain "); 239124144Sphk else 240124144Sphk seq_printf(s, "push-pull "); 241124144Sphk 242124144Sphk seq_printf(s, "%s (%x)\n", 243124144Sphk wm8994_gpio_fn(reg & WM8994_GPN_FN_MASK), reg); 244124144Sphk } 245124144Sphk} 246124144Sphk#else 247124144Sphk#define wm8994_gpio_dbg_show NULL 248124144Sphk#endif 249124144Sphk 250124144Sphkstatic const struct gpio_chip template_chip = { 251124144Sphk .label = "wm8994", 252124144Sphk .owner = THIS_MODULE, 253124144Sphk .request = wm8994_gpio_request, 254124144Sphk .direction_input = wm8994_gpio_direction_in, 255124144Sphk .get = wm8994_gpio_get, 256124144Sphk .direction_output = wm8994_gpio_direction_out, 257124144Sphk .set = wm8994_gpio_set, 258124144Sphk .set_config = wm8994_gpio_set_config, 259124144Sphk .to_irq = wm8994_gpio_to_irq, 260124144Sphk .dbg_show = wm8994_gpio_dbg_show, 261124144Sphk .can_sleep = true, 262124144Sphk}; 263124144Sphk 264124144Sphkstatic int wm8994_gpio_probe(struct platform_device *pdev) 265124144Sphk{ 266124144Sphk struct wm8994 *wm8994 = dev_get_drvdata(pdev->dev.parent); 267124144Sphk struct wm8994_pdata *pdata = dev_get_platdata(wm8994->dev); 268124144Sphk struct wm8994_gpio *wm8994_gpio; 269124144Sphk 270124144Sphk wm8994_gpio = devm_kzalloc(&pdev->dev, sizeof(*wm8994_gpio), 271124144Sphk GFP_KERNEL); 272124144Sphk if (wm8994_gpio == NULL) 273124144Sphk return -ENOMEM; 274124144Sphk 275124144Sphk wm8994_gpio->wm8994 = wm8994; 276124144Sphk wm8994_gpio->gpio_chip = template_chip; 277124144Sphk wm8994_gpio->gpio_chip.ngpio = WM8994_GPIO_MAX; 278124144Sphk wm8994_gpio->gpio_chip.parent = &pdev->dev; 279124144Sphk if (pdata && pdata->gpio_base) 280124144Sphk wm8994_gpio->gpio_chip.base = pdata->gpio_base; 281124144Sphk else 282124144Sphk wm8994_gpio->gpio_chip.base = -1; 283124144Sphk 284124144Sphk return devm_gpiochip_add_data(&pdev->dev, &wm8994_gpio->gpio_chip, wm8994_gpio); 285124144Sphk} 286124144Sphk 287124144Sphkstatic struct platform_driver wm8994_gpio_driver = { 288124144Sphk .driver.name = "wm8994-gpio", 289124144Sphk .probe = wm8994_gpio_probe, 290124144Sphk}; 291124144Sphk 292124144Sphkstatic int __init wm8994_gpio_init(void) 293124144Sphk{ 294124144Sphk return platform_driver_register(&wm8994_gpio_driver); 295124144Sphk} 296124144Sphksubsys_initcall(wm8994_gpio_init); 297124144Sphk 298124144Sphkstatic void __exit wm8994_gpio_exit(void) 299124144Sphk{ 300124144Sphk platform_driver_unregister(&wm8994_gpio_driver); 301} 302module_exit(wm8994_gpio_exit); 303 304MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); 305MODULE_DESCRIPTION("GPIO interface for WM8994"); 306MODULE_LICENSE("GPL"); 307MODULE_ALIAS("platform:wm8994-gpio"); 308