2 * gpiolib support for Wolfson WM8994
4 * Copyright 2009 Wolfson Microelectronics PLC.
6 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
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.
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>
23 #include <linux/mfd/wm8994/core.h>
24 #include <linux/mfd/wm8994/pdata.h>
25 #include <linux/mfd/wm8994/gpio.h>
26 #include <linux/mfd/wm8994/registers.h>
29 struct wm8994 *wm8994;
30 struct gpio_chip gpio_chip;
33 static inline struct wm8994_gpio *to_wm8994_gpio(struct gpio_chip *chip)
35 return container_of(chip, struct wm8994_gpio, gpio_chip);
38 static int wm8994_gpio_request(struct gpio_chip *chip, unsigned offset)
40 struct wm8994_gpio *wm8994_gpio = to_wm8994_gpio(chip);
41 struct wm8994 *wm8994 = wm8994_gpio->wm8994;
43 switch (wm8994->type) {
61 static int wm8994_gpio_direction_in(struct gpio_chip *chip, unsigned offset)
63 struct wm8994_gpio *wm8994_gpio = to_wm8994_gpio(chip);
64 struct wm8994 *wm8994 = wm8994_gpio->wm8994;
66 return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset,
67 WM8994_GPN_DIR, WM8994_GPN_DIR);
70 static int wm8994_gpio_get(struct gpio_chip *chip, unsigned offset)
72 struct wm8994_gpio *wm8994_gpio = to_wm8994_gpio(chip);
73 struct wm8994 *wm8994 = wm8994_gpio->wm8994;
76 ret = wm8994_reg_read(wm8994, WM8994_GPIO_1 + offset);
80 if (ret & WM8994_GPN_LVL)
86 static int wm8994_gpio_direction_out(struct gpio_chip *chip,
87 unsigned offset, int value)
89 struct wm8994_gpio *wm8994_gpio = to_wm8994_gpio(chip);
90 struct wm8994 *wm8994 = wm8994_gpio->wm8994;
93 value = WM8994_GPN_LVL;
95 return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset,
96 WM8994_GPN_DIR | WM8994_GPN_LVL, value);
99 static void wm8994_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
101 struct wm8994_gpio *wm8994_gpio = to_wm8994_gpio(chip);
102 struct wm8994 *wm8994 = wm8994_gpio->wm8994;
105 value = WM8994_GPN_LVL;
107 wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset, WM8994_GPN_LVL, value);
110 static int wm8994_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
112 struct wm8994_gpio *wm8994_gpio = to_wm8994_gpio(chip);
113 struct wm8994 *wm8994 = wm8994_gpio->wm8994;
115 if (!wm8994->irq_base)
118 return wm8994->irq_base + offset;
122 #ifdef CONFIG_DEBUG_FS
123 static void wm8994_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
125 struct wm8994_gpio *wm8994_gpio = to_wm8994_gpio(chip);
126 struct wm8994 *wm8994 = wm8994_gpio->wm8994;
129 for (i = 0; i < chip->ngpio; i++) {
130 int gpio = i + chip->base;
134 /* We report the GPIO even if it's not requested since
135 * we're also reporting things like alternate
136 * functions which apply even when the GPIO is not in
139 label = gpiochip_is_requested(chip, i);
141 label = "Unrequested";
143 seq_printf(s, " gpio-%-3d (%-20.20s) ", gpio, label);
145 reg = wm8994_reg_read(wm8994, WM8994_GPIO_1 + i);
148 "GPIO control %d read failed: %d\n",
154 /* No decode yet; note that GPIO2 is special */
155 seq_printf(s, "(%x)\n", reg);
159 #define wm8994_gpio_dbg_show NULL
162 static struct gpio_chip template_chip = {
164 .owner = THIS_MODULE,
165 .request = wm8994_gpio_request,
166 .direction_input = wm8994_gpio_direction_in,
167 .get = wm8994_gpio_get,
168 .direction_output = wm8994_gpio_direction_out,
169 .set = wm8994_gpio_set,
170 .to_irq = wm8994_gpio_to_irq,
171 .dbg_show = wm8994_gpio_dbg_show,
175 static int __devinit wm8994_gpio_probe(struct platform_device *pdev)
177 struct wm8994 *wm8994 = dev_get_drvdata(pdev->dev.parent);
178 struct wm8994_pdata *pdata = wm8994->dev->platform_data;
179 struct wm8994_gpio *wm8994_gpio;
182 wm8994_gpio = kzalloc(sizeof(*wm8994_gpio), GFP_KERNEL);
183 if (wm8994_gpio == NULL)
186 wm8994_gpio->wm8994 = wm8994;
187 wm8994_gpio->gpio_chip = template_chip;
188 wm8994_gpio->gpio_chip.ngpio = WM8994_GPIO_MAX;
189 wm8994_gpio->gpio_chip.dev = &pdev->dev;
190 if (pdata && pdata->gpio_base)
191 wm8994_gpio->gpio_chip.base = pdata->gpio_base;
193 wm8994_gpio->gpio_chip.base = -1;
195 ret = gpiochip_add(&wm8994_gpio->gpio_chip);
197 dev_err(&pdev->dev, "Could not register gpiochip, %d\n",
202 platform_set_drvdata(pdev, wm8994_gpio);
211 static int __devexit wm8994_gpio_remove(struct platform_device *pdev)
213 struct wm8994_gpio *wm8994_gpio = platform_get_drvdata(pdev);
216 ret = gpiochip_remove(&wm8994_gpio->gpio_chip);
223 static struct platform_driver wm8994_gpio_driver = {
224 .driver.name = "wm8994-gpio",
225 .driver.owner = THIS_MODULE,
226 .probe = wm8994_gpio_probe,
227 .remove = __devexit_p(wm8994_gpio_remove),
230 static int __init wm8994_gpio_init(void)
232 return platform_driver_register(&wm8994_gpio_driver);
234 subsys_initcall(wm8994_gpio_init);
236 static void __exit wm8994_gpio_exit(void)
238 platform_driver_unregister(&wm8994_gpio_driver);
240 module_exit(wm8994_gpio_exit);
242 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
243 MODULE_DESCRIPTION("GPIO interface for WM8994");
244 MODULE_LICENSE("GPL");
245 MODULE_ALIAS("platform:wm8994-gpio");