1 // SPDX-License-Identifier: GPL-2.0+
3 * gpiolib support for Wolfson WM8994
5 * Copyright 2009 Wolfson Microelectronics PLC.
7 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
11 #include <linux/cleanup.h>
12 #include <linux/kernel.h>
13 #include <linux/slab.h>
14 #include <linux/module.h>
15 #include <linux/gpio/driver.h>
16 #include <linux/mfd/core.h>
17 #include <linux/platform_device.h>
18 #include <linux/seq_file.h>
19 #include <linux/regmap.h>
21 #include <linux/mfd/wm8994/core.h>
22 #include <linux/mfd/wm8994/pdata.h>
23 #include <linux/mfd/wm8994/gpio.h>
24 #include <linux/mfd/wm8994/registers.h>
27 struct wm8994 *wm8994;
28 struct gpio_chip gpio_chip;
31 static int wm8994_gpio_request(struct gpio_chip *chip, unsigned offset)
33 struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);
34 struct wm8994 *wm8994 = wm8994_gpio->wm8994;
36 switch (wm8994->type) {
54 static int wm8994_gpio_direction_in(struct gpio_chip *chip, unsigned offset)
56 struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);
57 struct wm8994 *wm8994 = wm8994_gpio->wm8994;
59 return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset,
60 WM8994_GPN_DIR, WM8994_GPN_DIR);
63 static int wm8994_gpio_get(struct gpio_chip *chip, unsigned offset)
65 struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);
66 struct wm8994 *wm8994 = wm8994_gpio->wm8994;
69 ret = wm8994_reg_read(wm8994, WM8994_GPIO_1 + offset);
73 if (ret & WM8994_GPN_LVL)
79 static int wm8994_gpio_direction_out(struct gpio_chip *chip,
80 unsigned offset, int value)
82 struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);
83 struct wm8994 *wm8994 = wm8994_gpio->wm8994;
86 value = WM8994_GPN_LVL;
88 return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset,
89 WM8994_GPN_DIR | WM8994_GPN_LVL, value);
92 static void wm8994_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
94 struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);
95 struct wm8994 *wm8994 = wm8994_gpio->wm8994;
98 value = WM8994_GPN_LVL;
100 wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset, WM8994_GPN_LVL, value);
103 static int wm8994_gpio_set_config(struct gpio_chip *chip, unsigned int offset,
104 unsigned long config)
106 struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);
107 struct wm8994 *wm8994 = wm8994_gpio->wm8994;
109 switch (pinconf_to_config_param(config)) {
110 case PIN_CONFIG_DRIVE_OPEN_DRAIN:
111 return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset,
112 WM8994_GPN_OP_CFG_MASK,
114 case PIN_CONFIG_DRIVE_PUSH_PULL:
115 return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset,
116 WM8994_GPN_OP_CFG_MASK, 0);
124 static int wm8994_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
126 struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);
127 struct wm8994 *wm8994 = wm8994_gpio->wm8994;
129 return regmap_irq_get_virq(wm8994->irq_data, offset);
133 #ifdef CONFIG_DEBUG_FS
134 static const char *wm8994_gpio_fn(u16 fn)
137 case WM8994_GP_FN_PIN_SPECIFIC:
138 return "pin-specific";
139 case WM8994_GP_FN_GPIO:
141 case WM8994_GP_FN_SDOUT:
143 case WM8994_GP_FN_IRQ:
145 case WM8994_GP_FN_TEMPERATURE:
146 return "Temperature";
147 case WM8994_GP_FN_MICBIAS1_DET:
148 return "MICBIAS1 detect";
149 case WM8994_GP_FN_MICBIAS1_SHORT:
150 return "MICBIAS1 short";
151 case WM8994_GP_FN_MICBIAS2_DET:
152 return "MICBIAS2 detect";
153 case WM8994_GP_FN_MICBIAS2_SHORT:
154 return "MICBIAS2 short";
155 case WM8994_GP_FN_FLL1_LOCK:
157 case WM8994_GP_FN_FLL2_LOCK:
159 case WM8994_GP_FN_SRC1_LOCK:
161 case WM8994_GP_FN_SRC2_LOCK:
163 case WM8994_GP_FN_DRC1_ACT:
164 return "DRC1 activity";
165 case WM8994_GP_FN_DRC2_ACT:
166 return "DRC2 activity";
167 case WM8994_GP_FN_DRC3_ACT:
168 return "DRC3 activity";
169 case WM8994_GP_FN_WSEQ_STATUS:
170 return "Write sequencer";
171 case WM8994_GP_FN_FIFO_ERROR:
173 case WM8994_GP_FN_OPCLK:
175 case WM8994_GP_FN_THW:
176 return "Thermal warning";
177 case WM8994_GP_FN_DCS_DONE:
179 case WM8994_GP_FN_FLL1_OUT:
180 return "FLL1 output";
181 case WM8994_GP_FN_FLL2_OUT:
182 return "FLL1 output";
188 static void wm8994_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
190 struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);
191 struct wm8994 *wm8994 = wm8994_gpio->wm8994;
194 for (i = 0; i < chip->ngpio; i++) {
195 int gpio = i + chip->base;
198 /* We report the GPIO even if it's not requested since
199 * we're also reporting things like alternate
200 * functions which apply even when the GPIO is not in
203 char *label __free(kfree) = gpiochip_dup_line_label(chip, i);
205 dev_err(wm8994->dev, "Failed to duplicate label\n");
209 seq_printf(s, " gpio-%-3d (%-20.20s) ", gpio,
210 label ?: "Unrequested");
212 reg = wm8994_reg_read(wm8994, WM8994_GPIO_1 + i);
215 "GPIO control %d read failed: %d\n",
221 if (reg & WM8994_GPN_DIR)
222 seq_printf(s, "in ");
224 seq_printf(s, "out ");
226 if (reg & WM8994_GPN_PU)
227 seq_printf(s, "pull up ");
229 if (reg & WM8994_GPN_PD)
230 seq_printf(s, "pull down ");
232 if (reg & WM8994_GPN_POL)
233 seq_printf(s, "inverted ");
235 seq_printf(s, "noninverted ");
237 if (reg & WM8994_GPN_OP_CFG)
238 seq_printf(s, "open drain ");
240 seq_printf(s, "push-pull ");
242 seq_printf(s, "%s (%x)\n",
243 wm8994_gpio_fn(reg & WM8994_GPN_FN_MASK), reg);
247 #define wm8994_gpio_dbg_show NULL
250 static const struct gpio_chip template_chip = {
252 .owner = THIS_MODULE,
253 .request = wm8994_gpio_request,
254 .direction_input = wm8994_gpio_direction_in,
255 .get = wm8994_gpio_get,
256 .direction_output = wm8994_gpio_direction_out,
257 .set = wm8994_gpio_set,
258 .set_config = wm8994_gpio_set_config,
259 .to_irq = wm8994_gpio_to_irq,
260 .dbg_show = wm8994_gpio_dbg_show,
264 static int wm8994_gpio_probe(struct platform_device *pdev)
266 struct wm8994 *wm8994 = dev_get_drvdata(pdev->dev.parent);
267 struct wm8994_pdata *pdata = dev_get_platdata(wm8994->dev);
268 struct wm8994_gpio *wm8994_gpio;
270 wm8994_gpio = devm_kzalloc(&pdev->dev, sizeof(*wm8994_gpio),
272 if (wm8994_gpio == NULL)
275 wm8994_gpio->wm8994 = wm8994;
276 wm8994_gpio->gpio_chip = template_chip;
277 wm8994_gpio->gpio_chip.ngpio = WM8994_GPIO_MAX;
278 wm8994_gpio->gpio_chip.parent = &pdev->dev;
279 if (pdata && pdata->gpio_base)
280 wm8994_gpio->gpio_chip.base = pdata->gpio_base;
282 wm8994_gpio->gpio_chip.base = -1;
284 return devm_gpiochip_add_data(&pdev->dev, &wm8994_gpio->gpio_chip, wm8994_gpio);
287 static struct platform_driver wm8994_gpio_driver = {
288 .driver.name = "wm8994-gpio",
289 .probe = wm8994_gpio_probe,
292 static int __init wm8994_gpio_init(void)
294 return platform_driver_register(&wm8994_gpio_driver);
296 subsys_initcall(wm8994_gpio_init);
298 static void __exit wm8994_gpio_exit(void)
300 platform_driver_unregister(&wm8994_gpio_driver);
302 module_exit(wm8994_gpio_exit);
304 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
305 MODULE_DESCRIPTION("GPIO interface for WM8994");
306 MODULE_LICENSE("GPL");
307 MODULE_ALIAS("platform:wm8994-gpio");