2 * wm831x-gpio.c -- gpiolib support for Wolfson WM831x PMICs
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/module.h>
17 #include <linux/gpio.h>
18 #include <linux/mfd/core.h>
19 #include <linux/platform_device.h>
20 #include <linux/seq_file.h>
22 #include <linux/mfd/wm831x/core.h>
23 #include <linux/mfd/wm831x/pdata.h>
24 #include <linux/mfd/wm831x/gpio.h>
25 #include <linux/mfd/wm831x/irq.h>
28 struct wm831x *wm831x;
29 struct gpio_chip gpio_chip;
32 static inline struct wm831x_gpio *to_wm831x_gpio(struct gpio_chip *chip)
34 return container_of(chip, struct wm831x_gpio, gpio_chip);
37 static int wm831x_gpio_direction_in(struct gpio_chip *chip, unsigned offset)
39 struct wm831x_gpio *wm831x_gpio = to_wm831x_gpio(chip);
40 struct wm831x *wm831x = wm831x_gpio->wm831x;
41 int val = WM831X_GPN_DIR;
43 if (wm831x->has_gpio_ena)
44 val |= WM831X_GPN_TRI;
46 return wm831x_set_bits(wm831x, WM831X_GPIO1_CONTROL + offset,
47 WM831X_GPN_DIR | WM831X_GPN_TRI |
48 WM831X_GPN_FN_MASK, val);
51 static int wm831x_gpio_get(struct gpio_chip *chip, unsigned offset)
53 struct wm831x_gpio *wm831x_gpio = to_wm831x_gpio(chip);
54 struct wm831x *wm831x = wm831x_gpio->wm831x;
57 ret = wm831x_reg_read(wm831x, WM831X_GPIO_LEVEL);
61 if (ret & 1 << offset)
67 static void wm831x_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
69 struct wm831x_gpio *wm831x_gpio = to_wm831x_gpio(chip);
70 struct wm831x *wm831x = wm831x_gpio->wm831x;
72 wm831x_set_bits(wm831x, WM831X_GPIO_LEVEL, 1 << offset,
76 static int wm831x_gpio_direction_out(struct gpio_chip *chip,
77 unsigned offset, int value)
79 struct wm831x_gpio *wm831x_gpio = to_wm831x_gpio(chip);
80 struct wm831x *wm831x = wm831x_gpio->wm831x;
84 if (wm831x->has_gpio_ena)
85 val |= WM831X_GPN_TRI;
87 ret = wm831x_set_bits(wm831x, WM831X_GPIO1_CONTROL + offset,
88 WM831X_GPN_DIR | WM831X_GPN_TRI |
89 WM831X_GPN_FN_MASK, val);
93 /* Can only set GPIO state once it's in output mode */
94 wm831x_gpio_set(chip, offset, value);
99 static int wm831x_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
101 struct wm831x_gpio *wm831x_gpio = to_wm831x_gpio(chip);
102 struct wm831x *wm831x = wm831x_gpio->wm831x;
104 if (!wm831x->irq_base)
107 return wm831x->irq_base + WM831X_IRQ_GPIO_1 + offset;
110 #ifdef CONFIG_DEBUG_FS
111 static void wm831x_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
113 struct wm831x_gpio *wm831x_gpio = to_wm831x_gpio(chip);
114 struct wm831x *wm831x = wm831x_gpio->wm831x;
117 for (i = 0; i < chip->ngpio; i++) {
118 int gpio = i + chip->base;
120 const char *label, *pull, *powerdomain;
122 /* We report the GPIO even if it's not requested since
123 * we're also reporting things like alternate
124 * functions which apply even when the GPIO is not in
127 label = gpiochip_is_requested(chip, i);
129 label = "Unrequested";
131 seq_printf(s, " gpio-%-3d (%-20.20s) ", gpio, label);
133 reg = wm831x_reg_read(wm831x, WM831X_GPIO1_CONTROL + i);
136 "GPIO control %d read failed: %d\n",
142 switch (reg & WM831X_GPN_PULL_MASK) {
143 case WM831X_GPIO_PULL_NONE:
146 case WM831X_GPIO_PULL_DOWN:
149 case WM831X_GPIO_PULL_UP:
152 pull = "INVALID PULL";
159 if (reg & WM831X_GPN_PWR_DOM)
160 powerdomain = "VPMIC";
162 powerdomain = "DBVDD";
167 if (reg & WM831X_GPN_PWR_DOM)
168 powerdomain = "SYSVDD";
170 powerdomain = "DBVDD";
174 powerdomain = "TPVDD";
182 tristated = reg & WM831X_GPN_TRI;
183 if (wm831x->has_gpio_ena)
184 tristated = !tristated;
186 seq_printf(s, " %s %s %s %s%s\n"
188 reg & WM831X_GPN_DIR ? "in" : "out",
189 wm831x_gpio_get(chip, i) ? "high" : "low",
192 reg & WM831X_GPN_POL ? "" : " inverted",
193 reg & WM831X_GPN_OD ? "open-drain" : "CMOS",
194 tristated ? " tristated" : "",
199 #define wm831x_gpio_dbg_show NULL
202 static struct gpio_chip template_chip = {
204 .owner = THIS_MODULE,
205 .direction_input = wm831x_gpio_direction_in,
206 .get = wm831x_gpio_get,
207 .direction_output = wm831x_gpio_direction_out,
208 .set = wm831x_gpio_set,
209 .to_irq = wm831x_gpio_to_irq,
210 .dbg_show = wm831x_gpio_dbg_show,
214 static int __devinit wm831x_gpio_probe(struct platform_device *pdev)
216 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
217 struct wm831x_pdata *pdata = wm831x->dev->platform_data;
218 struct wm831x_gpio *wm831x_gpio;
221 wm831x_gpio = kzalloc(sizeof(*wm831x_gpio), GFP_KERNEL);
222 if (wm831x_gpio == NULL)
225 wm831x_gpio->wm831x = wm831x;
226 wm831x_gpio->gpio_chip = template_chip;
227 wm831x_gpio->gpio_chip.ngpio = wm831x->num_gpio;
228 wm831x_gpio->gpio_chip.dev = &pdev->dev;
229 if (pdata && pdata->gpio_base)
230 wm831x_gpio->gpio_chip.base = pdata->gpio_base;
232 wm831x_gpio->gpio_chip.base = -1;
234 ret = gpiochip_add(&wm831x_gpio->gpio_chip);
236 dev_err(&pdev->dev, "Could not register gpiochip, %d\n",
241 platform_set_drvdata(pdev, wm831x_gpio);
250 static int __devexit wm831x_gpio_remove(struct platform_device *pdev)
252 struct wm831x_gpio *wm831x_gpio = platform_get_drvdata(pdev);
255 ret = gpiochip_remove(&wm831x_gpio->gpio_chip);
262 static struct platform_driver wm831x_gpio_driver = {
263 .driver.name = "wm831x-gpio",
264 .driver.owner = THIS_MODULE,
265 .probe = wm831x_gpio_probe,
266 .remove = __devexit_p(wm831x_gpio_remove),
269 static int __init wm831x_gpio_init(void)
271 return platform_driver_register(&wm831x_gpio_driver);
273 subsys_initcall(wm831x_gpio_init);
275 static void __exit wm831x_gpio_exit(void)
277 platform_driver_unregister(&wm831x_gpio_driver);
279 module_exit(wm831x_gpio_exit);
281 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
282 MODULE_DESCRIPTION("GPIO interface for WM831x PMICs");
283 MODULE_LICENSE("GPL");
284 MODULE_ALIAS("platform:wm831x-gpio");