1c103de24SGrant Likely /* 2c103de24SGrant Likely * gpiolib support for Wolfson WM8994 3c103de24SGrant Likely * 4c103de24SGrant Likely * Copyright 2009 Wolfson Microelectronics PLC. 5c103de24SGrant Likely * 6c103de24SGrant Likely * Author: Mark Brown <broonie@opensource.wolfsonmicro.com> 7c103de24SGrant Likely * 8c103de24SGrant Likely * This program is free software; you can redistribute it and/or modify it 9c103de24SGrant Likely * under the terms of the GNU General Public License as published by the 10c103de24SGrant Likely * Free Software Foundation; either version 2 of the License, or (at your 11c103de24SGrant Likely * option) any later version. 12c103de24SGrant Likely * 13c103de24SGrant Likely */ 14c103de24SGrant Likely 15c103de24SGrant Likely #include <linux/kernel.h> 16c103de24SGrant Likely #include <linux/slab.h> 17c103de24SGrant Likely #include <linux/module.h> 18c103de24SGrant Likely #include <linux/gpio.h> 19c103de24SGrant Likely #include <linux/mfd/core.h> 20c103de24SGrant Likely #include <linux/platform_device.h> 21c103de24SGrant Likely #include <linux/seq_file.h> 22*224a1f90SMark Brown #include <linux/regmap.h> 23c103de24SGrant Likely 24c103de24SGrant Likely #include <linux/mfd/wm8994/core.h> 25c103de24SGrant Likely #include <linux/mfd/wm8994/pdata.h> 26c103de24SGrant Likely #include <linux/mfd/wm8994/gpio.h> 27c103de24SGrant Likely #include <linux/mfd/wm8994/registers.h> 28c103de24SGrant Likely 29c103de24SGrant Likely struct wm8994_gpio { 30c103de24SGrant Likely struct wm8994 *wm8994; 31c103de24SGrant Likely struct gpio_chip gpio_chip; 32c103de24SGrant Likely }; 33c103de24SGrant Likely 34c103de24SGrant Likely static inline struct wm8994_gpio *to_wm8994_gpio(struct gpio_chip *chip) 35c103de24SGrant Likely { 36c103de24SGrant Likely return container_of(chip, struct wm8994_gpio, gpio_chip); 37c103de24SGrant Likely } 38c103de24SGrant Likely 39c103de24SGrant Likely static int wm8994_gpio_request(struct gpio_chip *chip, unsigned offset) 40c103de24SGrant Likely { 41c103de24SGrant Likely struct wm8994_gpio *wm8994_gpio = to_wm8994_gpio(chip); 42c103de24SGrant Likely struct wm8994 *wm8994 = wm8994_gpio->wm8994; 43c103de24SGrant Likely 44c103de24SGrant Likely switch (wm8994->type) { 45c103de24SGrant Likely case WM8958: 46c103de24SGrant Likely switch (offset) { 47c103de24SGrant Likely case 1: 48c103de24SGrant Likely case 2: 49c103de24SGrant Likely case 3: 50c103de24SGrant Likely case 4: 51c103de24SGrant Likely case 6: 52c103de24SGrant Likely return -EINVAL; 53c103de24SGrant Likely } 54c103de24SGrant Likely break; 55c103de24SGrant Likely default: 56c103de24SGrant Likely break; 57c103de24SGrant Likely } 58c103de24SGrant Likely 59c103de24SGrant Likely return 0; 60c103de24SGrant Likely } 61c103de24SGrant Likely 62c103de24SGrant Likely static int wm8994_gpio_direction_in(struct gpio_chip *chip, unsigned offset) 63c103de24SGrant Likely { 64c103de24SGrant Likely struct wm8994_gpio *wm8994_gpio = to_wm8994_gpio(chip); 65c103de24SGrant Likely struct wm8994 *wm8994 = wm8994_gpio->wm8994; 66c103de24SGrant Likely 67c103de24SGrant Likely return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset, 68c103de24SGrant Likely WM8994_GPN_DIR, WM8994_GPN_DIR); 69c103de24SGrant Likely } 70c103de24SGrant Likely 71c103de24SGrant Likely static int wm8994_gpio_get(struct gpio_chip *chip, unsigned offset) 72c103de24SGrant Likely { 73c103de24SGrant Likely struct wm8994_gpio *wm8994_gpio = to_wm8994_gpio(chip); 74c103de24SGrant Likely struct wm8994 *wm8994 = wm8994_gpio->wm8994; 75c103de24SGrant Likely int ret; 76c103de24SGrant Likely 77c103de24SGrant Likely ret = wm8994_reg_read(wm8994, WM8994_GPIO_1 + offset); 78c103de24SGrant Likely if (ret < 0) 79c103de24SGrant Likely return ret; 80c103de24SGrant Likely 81c103de24SGrant Likely if (ret & WM8994_GPN_LVL) 82c103de24SGrant Likely return 1; 83c103de24SGrant Likely else 84c103de24SGrant Likely return 0; 85c103de24SGrant Likely } 86c103de24SGrant Likely 87c103de24SGrant Likely static int wm8994_gpio_direction_out(struct gpio_chip *chip, 88c103de24SGrant Likely unsigned offset, int value) 89c103de24SGrant Likely { 90c103de24SGrant Likely struct wm8994_gpio *wm8994_gpio = to_wm8994_gpio(chip); 91c103de24SGrant Likely struct wm8994 *wm8994 = wm8994_gpio->wm8994; 92c103de24SGrant Likely 93c103de24SGrant Likely return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset, 94c103de24SGrant Likely WM8994_GPN_DIR, 0); 95c103de24SGrant Likely } 96c103de24SGrant Likely 97c103de24SGrant Likely static void wm8994_gpio_set(struct gpio_chip *chip, unsigned offset, int value) 98c103de24SGrant Likely { 99c103de24SGrant Likely struct wm8994_gpio *wm8994_gpio = to_wm8994_gpio(chip); 100c103de24SGrant Likely struct wm8994 *wm8994 = wm8994_gpio->wm8994; 101c103de24SGrant Likely 102c103de24SGrant Likely if (value) 103c103de24SGrant Likely value = WM8994_GPN_LVL; 104c103de24SGrant Likely 105c103de24SGrant Likely wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset, WM8994_GPN_LVL, value); 106c103de24SGrant Likely } 107c103de24SGrant Likely 108c103de24SGrant Likely static int wm8994_gpio_to_irq(struct gpio_chip *chip, unsigned offset) 109c103de24SGrant Likely { 110c103de24SGrant Likely struct wm8994_gpio *wm8994_gpio = to_wm8994_gpio(chip); 111c103de24SGrant Likely struct wm8994 *wm8994 = wm8994_gpio->wm8994; 112c103de24SGrant Likely 113*224a1f90SMark Brown return regmap_irq_get_virq(wm8994->irq_data, offset); 114c103de24SGrant Likely } 115c103de24SGrant Likely 116c103de24SGrant Likely 117c103de24SGrant Likely #ifdef CONFIG_DEBUG_FS 118d0ad5e89SMark Brown static const char *wm8994_gpio_fn(u16 fn) 119d0ad5e89SMark Brown { 120d0ad5e89SMark Brown switch (fn) { 121d0ad5e89SMark Brown case WM8994_GP_FN_PIN_SPECIFIC: 122d0ad5e89SMark Brown return "pin-specific"; 123d0ad5e89SMark Brown case WM8994_GP_FN_GPIO: 124d0ad5e89SMark Brown return "GPIO"; 125d0ad5e89SMark Brown case WM8994_GP_FN_SDOUT: 126d0ad5e89SMark Brown return "SDOUT"; 127d0ad5e89SMark Brown case WM8994_GP_FN_IRQ: 128d0ad5e89SMark Brown return "IRQ"; 129d0ad5e89SMark Brown case WM8994_GP_FN_TEMPERATURE: 130d0ad5e89SMark Brown return "Temperature"; 131d0ad5e89SMark Brown case WM8994_GP_FN_MICBIAS1_DET: 132d0ad5e89SMark Brown return "MICBIAS1 detect"; 133d0ad5e89SMark Brown case WM8994_GP_FN_MICBIAS1_SHORT: 134d0ad5e89SMark Brown return "MICBIAS1 short"; 135d0ad5e89SMark Brown case WM8994_GP_FN_MICBIAS2_DET: 136d0ad5e89SMark Brown return "MICBIAS2 detect"; 137d0ad5e89SMark Brown case WM8994_GP_FN_MICBIAS2_SHORT: 138d0ad5e89SMark Brown return "MICBIAS2 short"; 139d0ad5e89SMark Brown case WM8994_GP_FN_FLL1_LOCK: 140d0ad5e89SMark Brown return "FLL1 lock"; 141d0ad5e89SMark Brown case WM8994_GP_FN_FLL2_LOCK: 142d0ad5e89SMark Brown return "FLL2 lock"; 143d0ad5e89SMark Brown case WM8994_GP_FN_SRC1_LOCK: 144d0ad5e89SMark Brown return "SRC1 lock"; 145d0ad5e89SMark Brown case WM8994_GP_FN_SRC2_LOCK: 146d0ad5e89SMark Brown return "SRC2 lock"; 147d0ad5e89SMark Brown case WM8994_GP_FN_DRC1_ACT: 148d0ad5e89SMark Brown return "DRC1 activity"; 149d0ad5e89SMark Brown case WM8994_GP_FN_DRC2_ACT: 150d0ad5e89SMark Brown return "DRC2 activity"; 151d0ad5e89SMark Brown case WM8994_GP_FN_DRC3_ACT: 152d0ad5e89SMark Brown return "DRC3 activity"; 153d0ad5e89SMark Brown case WM8994_GP_FN_WSEQ_STATUS: 154d0ad5e89SMark Brown return "Write sequencer"; 155d0ad5e89SMark Brown case WM8994_GP_FN_FIFO_ERROR: 156d0ad5e89SMark Brown return "FIFO error"; 157d0ad5e89SMark Brown case WM8994_GP_FN_OPCLK: 158d0ad5e89SMark Brown return "OPCLK"; 159d0ad5e89SMark Brown case WM8994_GP_FN_THW: 160d0ad5e89SMark Brown return "Thermal warning"; 161d0ad5e89SMark Brown case WM8994_GP_FN_DCS_DONE: 162d0ad5e89SMark Brown return "DC servo"; 163d0ad5e89SMark Brown case WM8994_GP_FN_FLL1_OUT: 164d0ad5e89SMark Brown return "FLL1 output"; 165d0ad5e89SMark Brown case WM8994_GP_FN_FLL2_OUT: 166d0ad5e89SMark Brown return "FLL1 output"; 167d0ad5e89SMark Brown default: 168d0ad5e89SMark Brown return "Unknown"; 169d0ad5e89SMark Brown } 170d0ad5e89SMark Brown } 171d0ad5e89SMark Brown 172c103de24SGrant Likely static void wm8994_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip) 173c103de24SGrant Likely { 174c103de24SGrant Likely struct wm8994_gpio *wm8994_gpio = to_wm8994_gpio(chip); 175c103de24SGrant Likely struct wm8994 *wm8994 = wm8994_gpio->wm8994; 176c103de24SGrant Likely int i; 177c103de24SGrant Likely 178c103de24SGrant Likely for (i = 0; i < chip->ngpio; i++) { 179c103de24SGrant Likely int gpio = i + chip->base; 180c103de24SGrant Likely int reg; 181c103de24SGrant Likely const char *label; 182c103de24SGrant Likely 183c103de24SGrant Likely /* We report the GPIO even if it's not requested since 184c103de24SGrant Likely * we're also reporting things like alternate 185c103de24SGrant Likely * functions which apply even when the GPIO is not in 186c103de24SGrant Likely * use as a GPIO. 187c103de24SGrant Likely */ 188c103de24SGrant Likely label = gpiochip_is_requested(chip, i); 189c103de24SGrant Likely if (!label) 190c103de24SGrant Likely label = "Unrequested"; 191c103de24SGrant Likely 192c103de24SGrant Likely seq_printf(s, " gpio-%-3d (%-20.20s) ", gpio, label); 193c103de24SGrant Likely 194c103de24SGrant Likely reg = wm8994_reg_read(wm8994, WM8994_GPIO_1 + i); 195c103de24SGrant Likely if (reg < 0) { 196c103de24SGrant Likely dev_err(wm8994->dev, 197c103de24SGrant Likely "GPIO control %d read failed: %d\n", 198c103de24SGrant Likely gpio, reg); 199c103de24SGrant Likely seq_printf(s, "\n"); 200c103de24SGrant Likely continue; 201c103de24SGrant Likely } 202c103de24SGrant Likely 203d0ad5e89SMark Brown if (reg & WM8994_GPN_DIR) 204d0ad5e89SMark Brown seq_printf(s, "in "); 205d0ad5e89SMark Brown else 206d0ad5e89SMark Brown seq_printf(s, "out "); 207d0ad5e89SMark Brown 208d0ad5e89SMark Brown if (reg & WM8994_GPN_PU) 209d0ad5e89SMark Brown seq_printf(s, "pull up "); 210d0ad5e89SMark Brown 211d0ad5e89SMark Brown if (reg & WM8994_GPN_PD) 212d0ad5e89SMark Brown seq_printf(s, "pull down "); 213d0ad5e89SMark Brown 214d0ad5e89SMark Brown if (reg & WM8994_GPN_POL) 215d0ad5e89SMark Brown seq_printf(s, "inverted "); 216d0ad5e89SMark Brown else 217d0ad5e89SMark Brown seq_printf(s, "noninverted "); 218d0ad5e89SMark Brown 219d0ad5e89SMark Brown if (reg & WM8994_GPN_OP_CFG) 220d0ad5e89SMark Brown seq_printf(s, "open drain "); 221d0ad5e89SMark Brown else 222d0ad5e89SMark Brown seq_printf(s, "CMOS "); 223d0ad5e89SMark Brown 224d0ad5e89SMark Brown seq_printf(s, "%s (%x)\n", 225d0ad5e89SMark Brown wm8994_gpio_fn(reg & WM8994_GPN_FN_MASK), reg); 226c103de24SGrant Likely } 227c103de24SGrant Likely } 228c103de24SGrant Likely #else 229c103de24SGrant Likely #define wm8994_gpio_dbg_show NULL 230c103de24SGrant Likely #endif 231c103de24SGrant Likely 232c103de24SGrant Likely static struct gpio_chip template_chip = { 233c103de24SGrant Likely .label = "wm8994", 234c103de24SGrant Likely .owner = THIS_MODULE, 235c103de24SGrant Likely .request = wm8994_gpio_request, 236c103de24SGrant Likely .direction_input = wm8994_gpio_direction_in, 237c103de24SGrant Likely .get = wm8994_gpio_get, 238c103de24SGrant Likely .direction_output = wm8994_gpio_direction_out, 239c103de24SGrant Likely .set = wm8994_gpio_set, 240c103de24SGrant Likely .to_irq = wm8994_gpio_to_irq, 241c103de24SGrant Likely .dbg_show = wm8994_gpio_dbg_show, 242c103de24SGrant Likely .can_sleep = 1, 243c103de24SGrant Likely }; 244c103de24SGrant Likely 245c103de24SGrant Likely static int __devinit wm8994_gpio_probe(struct platform_device *pdev) 246c103de24SGrant Likely { 247c103de24SGrant Likely struct wm8994 *wm8994 = dev_get_drvdata(pdev->dev.parent); 248c103de24SGrant Likely struct wm8994_pdata *pdata = wm8994->dev->platform_data; 249c103de24SGrant Likely struct wm8994_gpio *wm8994_gpio; 250c103de24SGrant Likely int ret; 251c103de24SGrant Likely 252c103de24SGrant Likely wm8994_gpio = kzalloc(sizeof(*wm8994_gpio), GFP_KERNEL); 253c103de24SGrant Likely if (wm8994_gpio == NULL) 254c103de24SGrant Likely return -ENOMEM; 255c103de24SGrant Likely 256c103de24SGrant Likely wm8994_gpio->wm8994 = wm8994; 257c103de24SGrant Likely wm8994_gpio->gpio_chip = template_chip; 258c103de24SGrant Likely wm8994_gpio->gpio_chip.ngpio = WM8994_GPIO_MAX; 259c103de24SGrant Likely wm8994_gpio->gpio_chip.dev = &pdev->dev; 260c103de24SGrant Likely if (pdata && pdata->gpio_base) 261c103de24SGrant Likely wm8994_gpio->gpio_chip.base = pdata->gpio_base; 262c103de24SGrant Likely else 263c103de24SGrant Likely wm8994_gpio->gpio_chip.base = -1; 264c103de24SGrant Likely 265c103de24SGrant Likely ret = gpiochip_add(&wm8994_gpio->gpio_chip); 266c103de24SGrant Likely if (ret < 0) { 267c103de24SGrant Likely dev_err(&pdev->dev, "Could not register gpiochip, %d\n", 268c103de24SGrant Likely ret); 269c103de24SGrant Likely goto err; 270c103de24SGrant Likely } 271c103de24SGrant Likely 272c103de24SGrant Likely platform_set_drvdata(pdev, wm8994_gpio); 273c103de24SGrant Likely 274c103de24SGrant Likely return ret; 275c103de24SGrant Likely 276c103de24SGrant Likely err: 277c103de24SGrant Likely kfree(wm8994_gpio); 278c103de24SGrant Likely return ret; 279c103de24SGrant Likely } 280c103de24SGrant Likely 281c103de24SGrant Likely static int __devexit wm8994_gpio_remove(struct platform_device *pdev) 282c103de24SGrant Likely { 283c103de24SGrant Likely struct wm8994_gpio *wm8994_gpio = platform_get_drvdata(pdev); 284c103de24SGrant Likely int ret; 285c103de24SGrant Likely 286c103de24SGrant Likely ret = gpiochip_remove(&wm8994_gpio->gpio_chip); 287c103de24SGrant Likely if (ret == 0) 288c103de24SGrant Likely kfree(wm8994_gpio); 289c103de24SGrant Likely 290c103de24SGrant Likely return ret; 291c103de24SGrant Likely } 292c103de24SGrant Likely 293c103de24SGrant Likely static struct platform_driver wm8994_gpio_driver = { 294c103de24SGrant Likely .driver.name = "wm8994-gpio", 295c103de24SGrant Likely .driver.owner = THIS_MODULE, 296c103de24SGrant Likely .probe = wm8994_gpio_probe, 297c103de24SGrant Likely .remove = __devexit_p(wm8994_gpio_remove), 298c103de24SGrant Likely }; 299c103de24SGrant Likely 300c103de24SGrant Likely static int __init wm8994_gpio_init(void) 301c103de24SGrant Likely { 302c103de24SGrant Likely return platform_driver_register(&wm8994_gpio_driver); 303c103de24SGrant Likely } 304c103de24SGrant Likely subsys_initcall(wm8994_gpio_init); 305c103de24SGrant Likely 306c103de24SGrant Likely static void __exit wm8994_gpio_exit(void) 307c103de24SGrant Likely { 308c103de24SGrant Likely platform_driver_unregister(&wm8994_gpio_driver); 309c103de24SGrant Likely } 310c103de24SGrant Likely module_exit(wm8994_gpio_exit); 311c103de24SGrant Likely 312c103de24SGrant Likely MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); 313c103de24SGrant Likely MODULE_DESCRIPTION("GPIO interface for WM8994"); 314c103de24SGrant Likely MODULE_LICENSE("GPL"); 315c103de24SGrant Likely MODULE_ALIAS("platform:wm8994-gpio"); 316