1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * gpiolib support for Wolfson WM8994 4 * 5 * Copyright 2009 Wolfson Microelectronics PLC. 6 * 7 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com> 8 * 9 */ 10 11 #include <linux/kernel.h> 12 #include <linux/slab.h> 13 #include <linux/module.h> 14 #include <linux/gpio/driver.h> 15 #include <linux/mfd/core.h> 16 #include <linux/platform_device.h> 17 #include <linux/seq_file.h> 18 #include <linux/regmap.h> 19 20 #include <linux/mfd/wm8994/core.h> 21 #include <linux/mfd/wm8994/pdata.h> 22 #include <linux/mfd/wm8994/gpio.h> 23 #include <linux/mfd/wm8994/registers.h> 24 25 struct wm8994_gpio { 26 struct wm8994 *wm8994; 27 struct gpio_chip gpio_chip; 28 }; 29 30 static int wm8994_gpio_request(struct gpio_chip *chip, unsigned offset) 31 { 32 struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip); 33 struct wm8994 *wm8994 = wm8994_gpio->wm8994; 34 35 switch (wm8994->type) { 36 case WM8958: 37 switch (offset) { 38 case 1: 39 case 2: 40 case 3: 41 case 4: 42 case 6: 43 return -EINVAL; 44 } 45 break; 46 default: 47 break; 48 } 49 50 return 0; 51 } 52 53 static int wm8994_gpio_direction_in(struct gpio_chip *chip, unsigned offset) 54 { 55 struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip); 56 struct wm8994 *wm8994 = wm8994_gpio->wm8994; 57 58 return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset, 59 WM8994_GPN_DIR, WM8994_GPN_DIR); 60 } 61 62 static int wm8994_gpio_get(struct gpio_chip *chip, unsigned offset) 63 { 64 struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip); 65 struct wm8994 *wm8994 = wm8994_gpio->wm8994; 66 int ret; 67 68 ret = wm8994_reg_read(wm8994, WM8994_GPIO_1 + offset); 69 if (ret < 0) 70 return ret; 71 72 if (ret & WM8994_GPN_LVL) 73 return 1; 74 else 75 return 0; 76 } 77 78 static int wm8994_gpio_direction_out(struct gpio_chip *chip, 79 unsigned offset, int value) 80 { 81 struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip); 82 struct wm8994 *wm8994 = wm8994_gpio->wm8994; 83 84 if (value) 85 value = WM8994_GPN_LVL; 86 87 return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset, 88 WM8994_GPN_DIR | WM8994_GPN_LVL, value); 89 } 90 91 static void wm8994_gpio_set(struct gpio_chip *chip, unsigned offset, int value) 92 { 93 struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip); 94 struct wm8994 *wm8994 = wm8994_gpio->wm8994; 95 96 if (value) 97 value = WM8994_GPN_LVL; 98 99 wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset, WM8994_GPN_LVL, value); 100 } 101 102 static int wm8994_gpio_set_config(struct gpio_chip *chip, unsigned int offset, 103 unsigned long config) 104 { 105 struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip); 106 struct wm8994 *wm8994 = wm8994_gpio->wm8994; 107 108 switch (pinconf_to_config_param(config)) { 109 case PIN_CONFIG_DRIVE_OPEN_DRAIN: 110 return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset, 111 WM8994_GPN_OP_CFG_MASK, 112 WM8994_GPN_OP_CFG); 113 case PIN_CONFIG_DRIVE_PUSH_PULL: 114 return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset, 115 WM8994_GPN_OP_CFG_MASK, 0); 116 default: 117 break; 118 } 119 120 return -ENOTSUPP; 121 } 122 123 static int wm8994_gpio_to_irq(struct gpio_chip *chip, unsigned offset) 124 { 125 struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip); 126 struct wm8994 *wm8994 = wm8994_gpio->wm8994; 127 128 return regmap_irq_get_virq(wm8994->irq_data, offset); 129 } 130 131 132 #ifdef CONFIG_DEBUG_FS 133 static const char *wm8994_gpio_fn(u16 fn) 134 { 135 switch (fn) { 136 case WM8994_GP_FN_PIN_SPECIFIC: 137 return "pin-specific"; 138 case WM8994_GP_FN_GPIO: 139 return "GPIO"; 140 case WM8994_GP_FN_SDOUT: 141 return "SDOUT"; 142 case WM8994_GP_FN_IRQ: 143 return "IRQ"; 144 case WM8994_GP_FN_TEMPERATURE: 145 return "Temperature"; 146 case WM8994_GP_FN_MICBIAS1_DET: 147 return "MICBIAS1 detect"; 148 case WM8994_GP_FN_MICBIAS1_SHORT: 149 return "MICBIAS1 short"; 150 case WM8994_GP_FN_MICBIAS2_DET: 151 return "MICBIAS2 detect"; 152 case WM8994_GP_FN_MICBIAS2_SHORT: 153 return "MICBIAS2 short"; 154 case WM8994_GP_FN_FLL1_LOCK: 155 return "FLL1 lock"; 156 case WM8994_GP_FN_FLL2_LOCK: 157 return "FLL2 lock"; 158 case WM8994_GP_FN_SRC1_LOCK: 159 return "SRC1 lock"; 160 case WM8994_GP_FN_SRC2_LOCK: 161 return "SRC2 lock"; 162 case WM8994_GP_FN_DRC1_ACT: 163 return "DRC1 activity"; 164 case WM8994_GP_FN_DRC2_ACT: 165 return "DRC2 activity"; 166 case WM8994_GP_FN_DRC3_ACT: 167 return "DRC3 activity"; 168 case WM8994_GP_FN_WSEQ_STATUS: 169 return "Write sequencer"; 170 case WM8994_GP_FN_FIFO_ERROR: 171 return "FIFO error"; 172 case WM8994_GP_FN_OPCLK: 173 return "OPCLK"; 174 case WM8994_GP_FN_THW: 175 return "Thermal warning"; 176 case WM8994_GP_FN_DCS_DONE: 177 return "DC servo"; 178 case WM8994_GP_FN_FLL1_OUT: 179 return "FLL1 output"; 180 case WM8994_GP_FN_FLL2_OUT: 181 return "FLL1 output"; 182 default: 183 return "Unknown"; 184 } 185 } 186 187 static void wm8994_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip) 188 { 189 struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip); 190 struct wm8994 *wm8994 = wm8994_gpio->wm8994; 191 int i; 192 193 for (i = 0; i < chip->ngpio; i++) { 194 int gpio = i + chip->base; 195 int reg; 196 const char *label; 197 198 /* We report the GPIO even if it's not requested since 199 * we're also reporting things like alternate 200 * functions which apply even when the GPIO is not in 201 * use as a GPIO. 202 */ 203 label = gpiochip_is_requested(chip, i); 204 if (!label) 205 label = "Unrequested"; 206 207 seq_printf(s, " gpio-%-3d (%-20.20s) ", gpio, label); 208 209 reg = wm8994_reg_read(wm8994, WM8994_GPIO_1 + i); 210 if (reg < 0) { 211 dev_err(wm8994->dev, 212 "GPIO control %d read failed: %d\n", 213 gpio, reg); 214 seq_printf(s, "\n"); 215 continue; 216 } 217 218 if (reg & WM8994_GPN_DIR) 219 seq_printf(s, "in "); 220 else 221 seq_printf(s, "out "); 222 223 if (reg & WM8994_GPN_PU) 224 seq_printf(s, "pull up "); 225 226 if (reg & WM8994_GPN_PD) 227 seq_printf(s, "pull down "); 228 229 if (reg & WM8994_GPN_POL) 230 seq_printf(s, "inverted "); 231 else 232 seq_printf(s, "noninverted "); 233 234 if (reg & WM8994_GPN_OP_CFG) 235 seq_printf(s, "open drain "); 236 else 237 seq_printf(s, "push-pull "); 238 239 seq_printf(s, "%s (%x)\n", 240 wm8994_gpio_fn(reg & WM8994_GPN_FN_MASK), reg); 241 } 242 } 243 #else 244 #define wm8994_gpio_dbg_show NULL 245 #endif 246 247 static const struct gpio_chip template_chip = { 248 .label = "wm8994", 249 .owner = THIS_MODULE, 250 .request = wm8994_gpio_request, 251 .direction_input = wm8994_gpio_direction_in, 252 .get = wm8994_gpio_get, 253 .direction_output = wm8994_gpio_direction_out, 254 .set = wm8994_gpio_set, 255 .set_config = wm8994_gpio_set_config, 256 .to_irq = wm8994_gpio_to_irq, 257 .dbg_show = wm8994_gpio_dbg_show, 258 .can_sleep = true, 259 }; 260 261 static int wm8994_gpio_probe(struct platform_device *pdev) 262 { 263 struct wm8994 *wm8994 = dev_get_drvdata(pdev->dev.parent); 264 struct wm8994_pdata *pdata = dev_get_platdata(wm8994->dev); 265 struct wm8994_gpio *wm8994_gpio; 266 267 wm8994_gpio = devm_kzalloc(&pdev->dev, sizeof(*wm8994_gpio), 268 GFP_KERNEL); 269 if (wm8994_gpio == NULL) 270 return -ENOMEM; 271 272 wm8994_gpio->wm8994 = wm8994; 273 wm8994_gpio->gpio_chip = template_chip; 274 wm8994_gpio->gpio_chip.ngpio = WM8994_GPIO_MAX; 275 wm8994_gpio->gpio_chip.parent = &pdev->dev; 276 if (pdata && pdata->gpio_base) 277 wm8994_gpio->gpio_chip.base = pdata->gpio_base; 278 else 279 wm8994_gpio->gpio_chip.base = -1; 280 281 return devm_gpiochip_add_data(&pdev->dev, &wm8994_gpio->gpio_chip, wm8994_gpio); 282 } 283 284 static struct platform_driver wm8994_gpio_driver = { 285 .driver.name = "wm8994-gpio", 286 .probe = wm8994_gpio_probe, 287 }; 288 289 static int __init wm8994_gpio_init(void) 290 { 291 return platform_driver_register(&wm8994_gpio_driver); 292 } 293 subsys_initcall(wm8994_gpio_init); 294 295 static void __exit wm8994_gpio_exit(void) 296 { 297 platform_driver_unregister(&wm8994_gpio_driver); 298 } 299 module_exit(wm8994_gpio_exit); 300 301 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); 302 MODULE_DESCRIPTION("GPIO interface for WM8994"); 303 MODULE_LICENSE("GPL"); 304 MODULE_ALIAS("platform:wm8994-gpio"); 305