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 wm8994_gpio_request(struct gpio_chip * chip,unsigned offset)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 wm8994_gpio_direction_in(struct gpio_chip * chip,unsigned offset)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 wm8994_gpio_get(struct gpio_chip * chip,unsigned offset)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 wm8994_gpio_direction_out(struct gpio_chip * chip,unsigned offset,int value)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 wm8994_gpio_set(struct gpio_chip * chip,unsigned offset,int value)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 wm8994_gpio_set_config(struct gpio_chip * chip,unsigned int offset,unsigned long config)106 static int wm8994_gpio_set_config(struct gpio_chip *chip, unsigned int offset, 107 unsigned long config) 108 { 109 struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip); 110 struct wm8994 *wm8994 = wm8994_gpio->wm8994; 111 112 switch (pinconf_to_config_param(config)) { 113 case PIN_CONFIG_DRIVE_OPEN_DRAIN: 114 return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset, 115 WM8994_GPN_OP_CFG_MASK, 116 WM8994_GPN_OP_CFG); 117 case PIN_CONFIG_DRIVE_PUSH_PULL: 118 return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset, 119 WM8994_GPN_OP_CFG_MASK, 0); 120 default: 121 break; 122 } 123 124 return -ENOTSUPP; 125 } 126 wm8994_gpio_to_irq(struct gpio_chip * chip,unsigned offset)127 static int wm8994_gpio_to_irq(struct gpio_chip *chip, unsigned offset) 128 { 129 struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip); 130 struct wm8994 *wm8994 = wm8994_gpio->wm8994; 131 132 return regmap_irq_get_virq(wm8994->irq_data, offset); 133 } 134 135 136 #ifdef CONFIG_DEBUG_FS wm8994_gpio_fn(u16 fn)137 static const char *wm8994_gpio_fn(u16 fn) 138 { 139 switch (fn) { 140 case WM8994_GP_FN_PIN_SPECIFIC: 141 return "pin-specific"; 142 case WM8994_GP_FN_GPIO: 143 return "GPIO"; 144 case WM8994_GP_FN_SDOUT: 145 return "SDOUT"; 146 case WM8994_GP_FN_IRQ: 147 return "IRQ"; 148 case WM8994_GP_FN_TEMPERATURE: 149 return "Temperature"; 150 case WM8994_GP_FN_MICBIAS1_DET: 151 return "MICBIAS1 detect"; 152 case WM8994_GP_FN_MICBIAS1_SHORT: 153 return "MICBIAS1 short"; 154 case WM8994_GP_FN_MICBIAS2_DET: 155 return "MICBIAS2 detect"; 156 case WM8994_GP_FN_MICBIAS2_SHORT: 157 return "MICBIAS2 short"; 158 case WM8994_GP_FN_FLL1_LOCK: 159 return "FLL1 lock"; 160 case WM8994_GP_FN_FLL2_LOCK: 161 return "FLL2 lock"; 162 case WM8994_GP_FN_SRC1_LOCK: 163 return "SRC1 lock"; 164 case WM8994_GP_FN_SRC2_LOCK: 165 return "SRC2 lock"; 166 case WM8994_GP_FN_DRC1_ACT: 167 return "DRC1 activity"; 168 case WM8994_GP_FN_DRC2_ACT: 169 return "DRC2 activity"; 170 case WM8994_GP_FN_DRC3_ACT: 171 return "DRC3 activity"; 172 case WM8994_GP_FN_WSEQ_STATUS: 173 return "Write sequencer"; 174 case WM8994_GP_FN_FIFO_ERROR: 175 return "FIFO error"; 176 case WM8994_GP_FN_OPCLK: 177 return "OPCLK"; 178 case WM8994_GP_FN_THW: 179 return "Thermal warning"; 180 case WM8994_GP_FN_DCS_DONE: 181 return "DC servo"; 182 case WM8994_GP_FN_FLL1_OUT: 183 return "FLL1 output"; 184 case WM8994_GP_FN_FLL2_OUT: 185 return "FLL1 output"; 186 default: 187 return "Unknown"; 188 } 189 } 190 wm8994_gpio_dbg_show(struct seq_file * s,struct gpio_chip * chip)191 static void wm8994_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip) 192 { 193 struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip); 194 struct wm8994 *wm8994 = wm8994_gpio->wm8994; 195 int i; 196 197 for (i = 0; i < chip->ngpio; i++) { 198 int gpio = i + chip->base; 199 int reg; 200 const char *label; 201 202 /* We report the GPIO even if it's not requested since 203 * we're also reporting things like alternate 204 * functions which apply even when the GPIO is not in 205 * use as a GPIO. 206 */ 207 label = gpiochip_is_requested(chip, i); 208 if (!label) 209 label = "Unrequested"; 210 211 seq_printf(s, " gpio-%-3d (%-20.20s) ", gpio, label); 212 213 reg = wm8994_reg_read(wm8994, WM8994_GPIO_1 + i); 214 if (reg < 0) { 215 dev_err(wm8994->dev, 216 "GPIO control %d read failed: %d\n", 217 gpio, reg); 218 seq_printf(s, "\n"); 219 continue; 220 } 221 222 if (reg & WM8994_GPN_DIR) 223 seq_printf(s, "in "); 224 else 225 seq_printf(s, "out "); 226 227 if (reg & WM8994_GPN_PU) 228 seq_printf(s, "pull up "); 229 230 if (reg & WM8994_GPN_PD) 231 seq_printf(s, "pull down "); 232 233 if (reg & WM8994_GPN_POL) 234 seq_printf(s, "inverted "); 235 else 236 seq_printf(s, "noninverted "); 237 238 if (reg & WM8994_GPN_OP_CFG) 239 seq_printf(s, "open drain "); 240 else 241 seq_printf(s, "push-pull "); 242 243 seq_printf(s, "%s (%x)\n", 244 wm8994_gpio_fn(reg & WM8994_GPN_FN_MASK), reg); 245 } 246 } 247 #else 248 #define wm8994_gpio_dbg_show NULL 249 #endif 250 251 static const struct gpio_chip template_chip = { 252 .label = "wm8994", 253 .owner = THIS_MODULE, 254 .request = wm8994_gpio_request, 255 .direction_input = wm8994_gpio_direction_in, 256 .get = wm8994_gpio_get, 257 .direction_output = wm8994_gpio_direction_out, 258 .set = wm8994_gpio_set, 259 .set_config = wm8994_gpio_set_config, 260 .to_irq = wm8994_gpio_to_irq, 261 .dbg_show = wm8994_gpio_dbg_show, 262 .can_sleep = true, 263 }; 264 wm8994_gpio_probe(struct platform_device * pdev)265 static int wm8994_gpio_probe(struct platform_device *pdev) 266 { 267 struct wm8994 *wm8994 = dev_get_drvdata(pdev->dev.parent); 268 struct wm8994_pdata *pdata = dev_get_platdata(wm8994->dev); 269 struct wm8994_gpio *wm8994_gpio; 270 int ret; 271 272 wm8994_gpio = devm_kzalloc(&pdev->dev, sizeof(*wm8994_gpio), 273 GFP_KERNEL); 274 if (wm8994_gpio == NULL) 275 return -ENOMEM; 276 277 wm8994_gpio->wm8994 = wm8994; 278 wm8994_gpio->gpio_chip = template_chip; 279 wm8994_gpio->gpio_chip.ngpio = WM8994_GPIO_MAX; 280 wm8994_gpio->gpio_chip.parent = &pdev->dev; 281 if (pdata && pdata->gpio_base) 282 wm8994_gpio->gpio_chip.base = pdata->gpio_base; 283 else 284 wm8994_gpio->gpio_chip.base = -1; 285 286 ret = devm_gpiochip_add_data(&pdev->dev, &wm8994_gpio->gpio_chip, 287 wm8994_gpio); 288 if (ret < 0) { 289 dev_err(&pdev->dev, "Could not register gpiochip, %d\n", 290 ret); 291 return ret; 292 } 293 294 platform_set_drvdata(pdev, wm8994_gpio); 295 296 return ret; 297 } 298 299 static struct platform_driver wm8994_gpio_driver = { 300 .driver.name = "wm8994-gpio", 301 .probe = wm8994_gpio_probe, 302 }; 303 wm8994_gpio_init(void)304 static int __init wm8994_gpio_init(void) 305 { 306 return platform_driver_register(&wm8994_gpio_driver); 307 } 308 subsys_initcall(wm8994_gpio_init); 309 wm8994_gpio_exit(void)310 static void __exit wm8994_gpio_exit(void) 311 { 312 platform_driver_unregister(&wm8994_gpio_driver); 313 } 314 module_exit(wm8994_gpio_exit); 315 316 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); 317 MODULE_DESCRIPTION("GPIO interface for WM8994"); 318 MODULE_LICENSE("GPL"); 319 MODULE_ALIAS("platform:wm8994-gpio"); 320