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1// SPDX-License-Identifier: GPL-2.0+2/*3 * gpiolib support for Wolfson WM89944 *5 * Copyright 2009 Wolfson Microelectronics PLC.6 *7 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>8 *9 */10 11#include <linux/cleanup.h>12#include <linux/kernel.h>13#include <linux/slab.h>14#include <linux/module.h>15#include <linux/gpio/driver.h>16#include <linux/mfd/core.h>17#include <linux/platform_device.h>18#include <linux/seq_file.h>19#include <linux/regmap.h>20 21#include <linux/mfd/wm8994/core.h>22#include <linux/mfd/wm8994/pdata.h>23#include <linux/mfd/wm8994/gpio.h>24#include <linux/mfd/wm8994/registers.h>25 26struct wm8994_gpio {27 struct wm8994 *wm8994;28 struct gpio_chip gpio_chip;29};30 31static int wm8994_gpio_request(struct gpio_chip *chip, unsigned offset)32{33 struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);34 struct wm8994 *wm8994 = wm8994_gpio->wm8994;35 36 switch (wm8994->type) {37 case WM8958:38 switch (offset) {39 case 1:40 case 2:41 case 3:42 case 4:43 case 6:44 return -EINVAL;45 }46 break;47 default:48 break;49 }50 51 return 0;52}53 54static int wm8994_gpio_direction_in(struct gpio_chip *chip, unsigned offset)55{56 struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);57 struct wm8994 *wm8994 = wm8994_gpio->wm8994;58 59 return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset,60 WM8994_GPN_DIR, WM8994_GPN_DIR);61}62 63static int wm8994_gpio_get(struct gpio_chip *chip, unsigned offset)64{65 struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);66 struct wm8994 *wm8994 = wm8994_gpio->wm8994;67 int ret;68 69 ret = wm8994_reg_read(wm8994, WM8994_GPIO_1 + offset);70 if (ret < 0)71 return ret;72 73 if (ret & WM8994_GPN_LVL)74 return 1;75 else76 return 0;77}78 79static int wm8994_gpio_direction_out(struct gpio_chip *chip,80 unsigned offset, int value)81{82 struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);83 struct wm8994 *wm8994 = wm8994_gpio->wm8994;84 85 if (value)86 value = WM8994_GPN_LVL;87 88 return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset,89 WM8994_GPN_DIR | WM8994_GPN_LVL, value);90}91 92static void wm8994_gpio_set(struct gpio_chip *chip, unsigned offset, int value)93{94 struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);95 struct wm8994 *wm8994 = wm8994_gpio->wm8994;96 97 if (value)98 value = WM8994_GPN_LVL;99 100 wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset, WM8994_GPN_LVL, value);101}102 103static int wm8994_gpio_set_config(struct gpio_chip *chip, unsigned int offset,104 unsigned long config)105{106 struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);107 struct wm8994 *wm8994 = wm8994_gpio->wm8994;108 109 switch (pinconf_to_config_param(config)) {110 case PIN_CONFIG_DRIVE_OPEN_DRAIN:111 return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset,112 WM8994_GPN_OP_CFG_MASK,113 WM8994_GPN_OP_CFG);114 case PIN_CONFIG_DRIVE_PUSH_PULL:115 return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset,116 WM8994_GPN_OP_CFG_MASK, 0);117 default:118 break;119 }120 121 return -ENOTSUPP;122}123 124static int wm8994_gpio_to_irq(struct gpio_chip *chip, unsigned offset)125{126 struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);127 struct wm8994 *wm8994 = wm8994_gpio->wm8994;128 129 return regmap_irq_get_virq(wm8994->irq_data, offset);130}131 132 133#ifdef CONFIG_DEBUG_FS134static const char *wm8994_gpio_fn(u16 fn)135{136 switch (fn) {137 case WM8994_GP_FN_PIN_SPECIFIC:138 return "pin-specific";139 case WM8994_GP_FN_GPIO:140 return "GPIO";141 case WM8994_GP_FN_SDOUT:142 return "SDOUT";143 case WM8994_GP_FN_IRQ:144 return "IRQ";145 case WM8994_GP_FN_TEMPERATURE:146 return "Temperature";147 case WM8994_GP_FN_MICBIAS1_DET:148 return "MICBIAS1 detect";149 case WM8994_GP_FN_MICBIAS1_SHORT:150 return "MICBIAS1 short";151 case WM8994_GP_FN_MICBIAS2_DET:152 return "MICBIAS2 detect";153 case WM8994_GP_FN_MICBIAS2_SHORT:154 return "MICBIAS2 short";155 case WM8994_GP_FN_FLL1_LOCK:156 return "FLL1 lock";157 case WM8994_GP_FN_FLL2_LOCK:158 return "FLL2 lock";159 case WM8994_GP_FN_SRC1_LOCK:160 return "SRC1 lock";161 case WM8994_GP_FN_SRC2_LOCK:162 return "SRC2 lock";163 case WM8994_GP_FN_DRC1_ACT:164 return "DRC1 activity";165 case WM8994_GP_FN_DRC2_ACT:166 return "DRC2 activity";167 case WM8994_GP_FN_DRC3_ACT:168 return "DRC3 activity";169 case WM8994_GP_FN_WSEQ_STATUS:170 return "Write sequencer";171 case WM8994_GP_FN_FIFO_ERROR:172 return "FIFO error";173 case WM8994_GP_FN_OPCLK:174 return "OPCLK";175 case WM8994_GP_FN_THW:176 return "Thermal warning";177 case WM8994_GP_FN_DCS_DONE:178 return "DC servo";179 case WM8994_GP_FN_FLL1_OUT:180 return "FLL1 output";181 case WM8994_GP_FN_FLL2_OUT:182 return "FLL1 output";183 default:184 return "Unknown";185 }186}187 188static void wm8994_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)189{190 struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);191 struct wm8994 *wm8994 = wm8994_gpio->wm8994;192 int i;193 194 for (i = 0; i < chip->ngpio; i++) {195 int gpio = i + chip->base;196 int reg;197 198 /* We report the GPIO even if it's not requested since199 * we're also reporting things like alternate200 * functions which apply even when the GPIO is not in201 * use as a GPIO.202 */203 char *label __free(kfree) = gpiochip_dup_line_label(chip, i);204 if (IS_ERR(label)) {205 dev_err(wm8994->dev, "Failed to duplicate label\n");206 continue;207 }208 209 seq_printf(s, " gpio-%-3d (%-20.20s) ", gpio,210 label ?: "Unrequested");211 212 reg = wm8994_reg_read(wm8994, WM8994_GPIO_1 + i);213 if (reg < 0) {214 dev_err(wm8994->dev,215 "GPIO control %d read failed: %d\n",216 gpio, reg);217 seq_printf(s, "\n");218 continue;219 }220 221 if (reg & WM8994_GPN_DIR)222 seq_printf(s, "in ");223 else224 seq_printf(s, "out ");225 226 if (reg & WM8994_GPN_PU)227 seq_printf(s, "pull up ");228 229 if (reg & WM8994_GPN_PD)230 seq_printf(s, "pull down ");231 232 if (reg & WM8994_GPN_POL)233 seq_printf(s, "inverted ");234 else235 seq_printf(s, "noninverted ");236 237 if (reg & WM8994_GPN_OP_CFG)238 seq_printf(s, "open drain ");239 else240 seq_printf(s, "push-pull ");241 242 seq_printf(s, "%s (%x)\n",243 wm8994_gpio_fn(reg & WM8994_GPN_FN_MASK), reg);244 }245}246#else247#define wm8994_gpio_dbg_show NULL248#endif249 250static const struct gpio_chip template_chip = {251 .label = "wm8994",252 .owner = THIS_MODULE,253 .request = wm8994_gpio_request,254 .direction_input = wm8994_gpio_direction_in,255 .get = wm8994_gpio_get,256 .direction_output = wm8994_gpio_direction_out,257 .set = wm8994_gpio_set,258 .set_config = wm8994_gpio_set_config,259 .to_irq = wm8994_gpio_to_irq,260 .dbg_show = wm8994_gpio_dbg_show,261 .can_sleep = true,262};263 264static int wm8994_gpio_probe(struct platform_device *pdev)265{266 struct wm8994 *wm8994 = dev_get_drvdata(pdev->dev.parent);267 struct wm8994_pdata *pdata = dev_get_platdata(wm8994->dev);268 struct wm8994_gpio *wm8994_gpio;269 270 wm8994_gpio = devm_kzalloc(&pdev->dev, sizeof(*wm8994_gpio),271 GFP_KERNEL);272 if (wm8994_gpio == NULL)273 return -ENOMEM;274 275 wm8994_gpio->wm8994 = wm8994;276 wm8994_gpio->gpio_chip = template_chip;277 wm8994_gpio->gpio_chip.ngpio = WM8994_GPIO_MAX;278 wm8994_gpio->gpio_chip.parent = &pdev->dev;279 if (pdata && pdata->gpio_base)280 wm8994_gpio->gpio_chip.base = pdata->gpio_base;281 else282 wm8994_gpio->gpio_chip.base = -1;283 284 return devm_gpiochip_add_data(&pdev->dev, &wm8994_gpio->gpio_chip, wm8994_gpio);285}286 287static struct platform_driver wm8994_gpio_driver = {288 .driver.name = "wm8994-gpio",289 .probe = wm8994_gpio_probe,290};291 292static int __init wm8994_gpio_init(void)293{294 return platform_driver_register(&wm8994_gpio_driver);295}296subsys_initcall(wm8994_gpio_init);297 298static void __exit wm8994_gpio_exit(void)299{300 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