1 /* 2 * gpiolib support for Wolfson WM8994 3 * 4 * Copyright 2009 Wolfson Microelectronics PLC. 5 * 6 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com> 7 * 8 * This program is free software; you can redistribute it and/or modify it 9 * under the terms of the GNU General Public License as published by the 10 * Free Software Foundation; either version 2 of the License, or (at your 11 * option) any later version. 12 * 13 */ 14 15 #include <linux/kernel.h> 16 #include <linux/slab.h> 17 #include <linux/module.h> 18 #include <linux/gpio.h> 19 #include <linux/mfd/core.h> 20 #include <linux/platform_device.h> 21 #include <linux/seq_file.h> 22 #include <linux/regmap.h> 23 24 #include <linux/mfd/wm8994/core.h> 25 #include <linux/mfd/wm8994/pdata.h> 26 #include <linux/mfd/wm8994/gpio.h> 27 #include <linux/mfd/wm8994/registers.h> 28 29 struct wm8994_gpio { 30 struct wm8994 *wm8994; 31 struct gpio_chip gpio_chip; 32 }; 33 34 static int wm8994_gpio_request(struct gpio_chip *chip, unsigned offset) 35 { 36 struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip); 37 struct wm8994 *wm8994 = wm8994_gpio->wm8994; 38 39 switch (wm8994->type) { 40 case WM8958: 41 switch (offset) { 42 case 1: 43 case 2: 44 case 3: 45 case 4: 46 case 6: 47 return -EINVAL; 48 } 49 break; 50 default: 51 break; 52 } 53 54 return 0; 55 } 56 57 static int wm8994_gpio_direction_in(struct gpio_chip *chip, unsigned offset) 58 { 59 struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip); 60 struct wm8994 *wm8994 = wm8994_gpio->wm8994; 61 62 return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset, 63 WM8994_GPN_DIR, WM8994_GPN_DIR); 64 } 65 66 static int wm8994_gpio_get(struct gpio_chip *chip, unsigned offset) 67 { 68 struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip); 69 struct wm8994 *wm8994 = wm8994_gpio->wm8994; 70 int ret; 71 72 ret = wm8994_reg_read(wm8994, WM8994_GPIO_1 + offset); 73 if (ret < 0) 74 return ret; 75 76 if (ret & WM8994_GPN_LVL) 77 return 1; 78 else 79 return 0; 80 } 81 82 static int wm8994_gpio_direction_out(struct gpio_chip *chip, 83 unsigned offset, int value) 84 { 85 struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip); 86 struct wm8994 *wm8994 = wm8994_gpio->wm8994; 87 88 if (value) 89 value = WM8994_GPN_LVL; 90 91 return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset, 92 WM8994_GPN_DIR | WM8994_GPN_LVL, value); 93 } 94 95 static void wm8994_gpio_set(struct gpio_chip *chip, unsigned offset, int value) 96 { 97 struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip); 98 struct wm8994 *wm8994 = wm8994_gpio->wm8994; 99 100 if (value) 101 value = WM8994_GPN_LVL; 102 103 wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset, WM8994_GPN_LVL, value); 104 } 105 106 static int wm8994_gpio_set_single_ended(struct gpio_chip *chip, 107 unsigned int offset, 108 enum single_ended_mode mode) 109 { 110 struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip); 111 struct wm8994 *wm8994 = wm8994_gpio->wm8994; 112 113 switch (mode) { 114 case LINE_MODE_OPEN_DRAIN: 115 return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset, 116 WM8994_GPN_OP_CFG_MASK, 117 WM8994_GPN_OP_CFG); 118 case LINE_MODE_PUSH_PULL: 119 return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset, 120 WM8994_GPN_OP_CFG_MASK, 0); 121 default: 122 break; 123 } 124 125 return -ENOTSUPP; 126 } 127 128 static int wm8994_gpio_to_irq(struct gpio_chip *chip, unsigned offset) 129 { 130 struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip); 131 struct wm8994 *wm8994 = wm8994_gpio->wm8994; 132 133 return regmap_irq_get_virq(wm8994->irq_data, offset); 134 } 135 136 137 #ifdef CONFIG_DEBUG_FS 138 static const char *wm8994_gpio_fn(u16 fn) 139 { 140 switch (fn) { 141 case WM8994_GP_FN_PIN_SPECIFIC: 142 return "pin-specific"; 143 case WM8994_GP_FN_GPIO: 144 return "GPIO"; 145 case WM8994_GP_FN_SDOUT: 146 return "SDOUT"; 147 case WM8994_GP_FN_IRQ: 148 return "IRQ"; 149 case WM8994_GP_FN_TEMPERATURE: 150 return "Temperature"; 151 case WM8994_GP_FN_MICBIAS1_DET: 152 return "MICBIAS1 detect"; 153 case WM8994_GP_FN_MICBIAS1_SHORT: 154 return "MICBIAS1 short"; 155 case WM8994_GP_FN_MICBIAS2_DET: 156 return "MICBIAS2 detect"; 157 case WM8994_GP_FN_MICBIAS2_SHORT: 158 return "MICBIAS2 short"; 159 case WM8994_GP_FN_FLL1_LOCK: 160 return "FLL1 lock"; 161 case WM8994_GP_FN_FLL2_LOCK: 162 return "FLL2 lock"; 163 case WM8994_GP_FN_SRC1_LOCK: 164 return "SRC1 lock"; 165 case WM8994_GP_FN_SRC2_LOCK: 166 return "SRC2 lock"; 167 case WM8994_GP_FN_DRC1_ACT: 168 return "DRC1 activity"; 169 case WM8994_GP_FN_DRC2_ACT: 170 return "DRC2 activity"; 171 case WM8994_GP_FN_DRC3_ACT: 172 return "DRC3 activity"; 173 case WM8994_GP_FN_WSEQ_STATUS: 174 return "Write sequencer"; 175 case WM8994_GP_FN_FIFO_ERROR: 176 return "FIFO error"; 177 case WM8994_GP_FN_OPCLK: 178 return "OPCLK"; 179 case WM8994_GP_FN_THW: 180 return "Thermal warning"; 181 case WM8994_GP_FN_DCS_DONE: 182 return "DC servo"; 183 case WM8994_GP_FN_FLL1_OUT: 184 return "FLL1 output"; 185 case WM8994_GP_FN_FLL2_OUT: 186 return "FLL1 output"; 187 default: 188 return "Unknown"; 189 } 190 } 191 192 static void wm8994_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip) 193 { 194 struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip); 195 struct wm8994 *wm8994 = wm8994_gpio->wm8994; 196 int i; 197 198 for (i = 0; i < chip->ngpio; i++) { 199 int gpio = i + chip->base; 200 int reg; 201 const char *label; 202 203 /* We report the GPIO even if it's not requested since 204 * we're also reporting things like alternate 205 * functions which apply even when the GPIO is not in 206 * use as a GPIO. 207 */ 208 label = gpiochip_is_requested(chip, i); 209 if (!label) 210 label = "Unrequested"; 211 212 seq_printf(s, " gpio-%-3d (%-20.20s) ", gpio, label); 213 214 reg = wm8994_reg_read(wm8994, WM8994_GPIO_1 + i); 215 if (reg < 0) { 216 dev_err(wm8994->dev, 217 "GPIO control %d read failed: %d\n", 218 gpio, reg); 219 seq_printf(s, "\n"); 220 continue; 221 } 222 223 if (reg & WM8994_GPN_DIR) 224 seq_printf(s, "in "); 225 else 226 seq_printf(s, "out "); 227 228 if (reg & WM8994_GPN_PU) 229 seq_printf(s, "pull up "); 230 231 if (reg & WM8994_GPN_PD) 232 seq_printf(s, "pull down "); 233 234 if (reg & WM8994_GPN_POL) 235 seq_printf(s, "inverted "); 236 else 237 seq_printf(s, "noninverted "); 238 239 if (reg & WM8994_GPN_OP_CFG) 240 seq_printf(s, "open drain "); 241 else 242 seq_printf(s, "push-pull "); 243 244 seq_printf(s, "%s (%x)\n", 245 wm8994_gpio_fn(reg & WM8994_GPN_FN_MASK), reg); 246 } 247 } 248 #else 249 #define wm8994_gpio_dbg_show NULL 250 #endif 251 252 static const struct gpio_chip template_chip = { 253 .label = "wm8994", 254 .owner = THIS_MODULE, 255 .request = wm8994_gpio_request, 256 .direction_input = wm8994_gpio_direction_in, 257 .get = wm8994_gpio_get, 258 .direction_output = wm8994_gpio_direction_out, 259 .set = wm8994_gpio_set, 260 .set_single_ended = wm8994_gpio_set_single_ended, 261 .to_irq = wm8994_gpio_to_irq, 262 .dbg_show = wm8994_gpio_dbg_show, 263 .can_sleep = true, 264 }; 265 266 static int wm8994_gpio_probe(struct platform_device *pdev) 267 { 268 struct wm8994 *wm8994 = dev_get_drvdata(pdev->dev.parent); 269 struct wm8994_pdata *pdata = dev_get_platdata(wm8994->dev); 270 struct wm8994_gpio *wm8994_gpio; 271 int ret; 272 273 wm8994_gpio = devm_kzalloc(&pdev->dev, sizeof(*wm8994_gpio), 274 GFP_KERNEL); 275 if (wm8994_gpio == NULL) 276 return -ENOMEM; 277 278 wm8994_gpio->wm8994 = wm8994; 279 wm8994_gpio->gpio_chip = template_chip; 280 wm8994_gpio->gpio_chip.ngpio = WM8994_GPIO_MAX; 281 wm8994_gpio->gpio_chip.parent = &pdev->dev; 282 if (pdata && pdata->gpio_base) 283 wm8994_gpio->gpio_chip.base = pdata->gpio_base; 284 else 285 wm8994_gpio->gpio_chip.base = -1; 286 287 ret = devm_gpiochip_add_data(&pdev->dev, &wm8994_gpio->gpio_chip, 288 wm8994_gpio); 289 if (ret < 0) { 290 dev_err(&pdev->dev, "Could not register gpiochip, %d\n", 291 ret); 292 return ret; 293 } 294 295 platform_set_drvdata(pdev, wm8994_gpio); 296 297 return ret; 298 } 299 300 static struct platform_driver wm8994_gpio_driver = { 301 .driver.name = "wm8994-gpio", 302 .probe = wm8994_gpio_probe, 303 }; 304 305 static int __init wm8994_gpio_init(void) 306 { 307 return platform_driver_register(&wm8994_gpio_driver); 308 } 309 subsys_initcall(wm8994_gpio_init); 310 311 static void __exit wm8994_gpio_exit(void) 312 { 313 platform_driver_unregister(&wm8994_gpio_driver); 314 } 315 module_exit(wm8994_gpio_exit); 316 317 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); 318 MODULE_DESCRIPTION("GPIO interface for WM8994"); 319 MODULE_LICENSE("GPL"); 320 MODULE_ALIAS("platform:wm8994-gpio"); 321