166dbe750SLinus Walleij // SPDX-License-Identifier: GPL-2.0+
2c103de24SGrant Likely /*
3c103de24SGrant Likely * gpiolib support for Wolfson WM8994
4c103de24SGrant Likely *
5c103de24SGrant Likely * Copyright 2009 Wolfson Microelectronics PLC.
6c103de24SGrant Likely *
7c103de24SGrant Likely * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
8c103de24SGrant Likely *
9c103de24SGrant Likely */
10c103de24SGrant Likely
11*abeec1adSBartosz Golaszewski #include <linux/cleanup.h>
12c103de24SGrant Likely #include <linux/kernel.h>
13c103de24SGrant Likely #include <linux/slab.h>
14c103de24SGrant Likely #include <linux/module.h>
1510833c4bSLinus Walleij #include <linux/gpio/driver.h>
16c103de24SGrant Likely #include <linux/mfd/core.h>
17c103de24SGrant Likely #include <linux/platform_device.h>
18c103de24SGrant Likely #include <linux/seq_file.h>
19224a1f90SMark Brown #include <linux/regmap.h>
20c103de24SGrant Likely
21c103de24SGrant Likely #include <linux/mfd/wm8994/core.h>
22c103de24SGrant Likely #include <linux/mfd/wm8994/pdata.h>
23c103de24SGrant Likely #include <linux/mfd/wm8994/gpio.h>
24c103de24SGrant Likely #include <linux/mfd/wm8994/registers.h>
25c103de24SGrant Likely
26c103de24SGrant Likely struct wm8994_gpio {
27c103de24SGrant Likely struct wm8994 *wm8994;
28c103de24SGrant Likely struct gpio_chip gpio_chip;
29c103de24SGrant Likely };
30c103de24SGrant Likely
wm8994_gpio_request(struct gpio_chip * chip,unsigned offset)31c103de24SGrant Likely static int wm8994_gpio_request(struct gpio_chip *chip, unsigned offset)
32c103de24SGrant Likely {
33765aa587SLinus Walleij struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);
34c103de24SGrant Likely struct wm8994 *wm8994 = wm8994_gpio->wm8994;
35c103de24SGrant Likely
36c103de24SGrant Likely switch (wm8994->type) {
37c103de24SGrant Likely case WM8958:
38c103de24SGrant Likely switch (offset) {
39c103de24SGrant Likely case 1:
40c103de24SGrant Likely case 2:
41c103de24SGrant Likely case 3:
42c103de24SGrant Likely case 4:
43c103de24SGrant Likely case 6:
44c103de24SGrant Likely return -EINVAL;
45c103de24SGrant Likely }
46c103de24SGrant Likely break;
47c103de24SGrant Likely default:
48c103de24SGrant Likely break;
49c103de24SGrant Likely }
50c103de24SGrant Likely
51c103de24SGrant Likely return 0;
52c103de24SGrant Likely }
53c103de24SGrant Likely
wm8994_gpio_direction_in(struct gpio_chip * chip,unsigned offset)54c103de24SGrant Likely static int wm8994_gpio_direction_in(struct gpio_chip *chip, unsigned offset)
55c103de24SGrant Likely {
56765aa587SLinus Walleij struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);
57c103de24SGrant Likely struct wm8994 *wm8994 = wm8994_gpio->wm8994;
58c103de24SGrant Likely
59c103de24SGrant Likely return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset,
60c103de24SGrant Likely WM8994_GPN_DIR, WM8994_GPN_DIR);
61c103de24SGrant Likely }
62c103de24SGrant Likely
wm8994_gpio_get(struct gpio_chip * chip,unsigned offset)63c103de24SGrant Likely static int wm8994_gpio_get(struct gpio_chip *chip, unsigned offset)
64c103de24SGrant Likely {
65765aa587SLinus Walleij struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);
66c103de24SGrant Likely struct wm8994 *wm8994 = wm8994_gpio->wm8994;
67c103de24SGrant Likely int ret;
68c103de24SGrant Likely
69c103de24SGrant Likely ret = wm8994_reg_read(wm8994, WM8994_GPIO_1 + offset);
70c103de24SGrant Likely if (ret < 0)
71c103de24SGrant Likely return ret;
72c103de24SGrant Likely
73c103de24SGrant Likely if (ret & WM8994_GPN_LVL)
74c103de24SGrant Likely return 1;
75c103de24SGrant Likely else
76c103de24SGrant Likely return 0;
77c103de24SGrant Likely }
78c103de24SGrant Likely
wm8994_gpio_direction_out(struct gpio_chip * chip,unsigned offset,int value)79c103de24SGrant Likely static int wm8994_gpio_direction_out(struct gpio_chip *chip,
80c103de24SGrant Likely unsigned offset, int value)
81c103de24SGrant Likely {
82765aa587SLinus Walleij struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);
83c103de24SGrant Likely struct wm8994 *wm8994 = wm8994_gpio->wm8994;
84c103de24SGrant Likely
858cd578b6SMark Brown if (value)
868cd578b6SMark Brown value = WM8994_GPN_LVL;
878cd578b6SMark Brown
88c103de24SGrant Likely return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset,
898cd578b6SMark Brown WM8994_GPN_DIR | WM8994_GPN_LVL, value);
90c103de24SGrant Likely }
91c103de24SGrant Likely
wm8994_gpio_set(struct gpio_chip * chip,unsigned offset,int value)92c103de24SGrant Likely static void wm8994_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
93c103de24SGrant Likely {
94765aa587SLinus Walleij struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);
95c103de24SGrant Likely struct wm8994 *wm8994 = wm8994_gpio->wm8994;
96c103de24SGrant Likely
97c103de24SGrant Likely if (value)
98c103de24SGrant Likely value = WM8994_GPN_LVL;
99c103de24SGrant Likely
100c103de24SGrant Likely wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset, WM8994_GPN_LVL, value);
101c103de24SGrant Likely }
102c103de24SGrant Likely
wm8994_gpio_set_config(struct gpio_chip * chip,unsigned int offset,unsigned long config)1032956b5d9SMika Westerberg static int wm8994_gpio_set_config(struct gpio_chip *chip, unsigned int offset,
1042956b5d9SMika Westerberg unsigned long config)
105190ea434SLinus Walleij {
106190ea434SLinus Walleij struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);
107190ea434SLinus Walleij struct wm8994 *wm8994 = wm8994_gpio->wm8994;
108190ea434SLinus Walleij
1092956b5d9SMika Westerberg switch (pinconf_to_config_param(config)) {
1102956b5d9SMika Westerberg case PIN_CONFIG_DRIVE_OPEN_DRAIN:
111190ea434SLinus Walleij return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset,
112190ea434SLinus Walleij WM8994_GPN_OP_CFG_MASK,
113190ea434SLinus Walleij WM8994_GPN_OP_CFG);
1142956b5d9SMika Westerberg case PIN_CONFIG_DRIVE_PUSH_PULL:
115190ea434SLinus Walleij return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset,
116190ea434SLinus Walleij WM8994_GPN_OP_CFG_MASK, 0);
117190ea434SLinus Walleij default:
118190ea434SLinus Walleij break;
119190ea434SLinus Walleij }
120190ea434SLinus Walleij
121190ea434SLinus Walleij return -ENOTSUPP;
122190ea434SLinus Walleij }
123190ea434SLinus Walleij
wm8994_gpio_to_irq(struct gpio_chip * chip,unsigned offset)124c103de24SGrant Likely static int wm8994_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
125c103de24SGrant Likely {
126765aa587SLinus Walleij struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);
127c103de24SGrant Likely struct wm8994 *wm8994 = wm8994_gpio->wm8994;
128c103de24SGrant Likely
129224a1f90SMark Brown return regmap_irq_get_virq(wm8994->irq_data, offset);
130c103de24SGrant Likely }
131c103de24SGrant Likely
132c103de24SGrant Likely
133c103de24SGrant Likely #ifdef CONFIG_DEBUG_FS
wm8994_gpio_fn(u16 fn)134d0ad5e89SMark Brown static const char *wm8994_gpio_fn(u16 fn)
135d0ad5e89SMark Brown {
136d0ad5e89SMark Brown switch (fn) {
137d0ad5e89SMark Brown case WM8994_GP_FN_PIN_SPECIFIC:
138d0ad5e89SMark Brown return "pin-specific";
139d0ad5e89SMark Brown case WM8994_GP_FN_GPIO:
140d0ad5e89SMark Brown return "GPIO";
141d0ad5e89SMark Brown case WM8994_GP_FN_SDOUT:
142d0ad5e89SMark Brown return "SDOUT";
143d0ad5e89SMark Brown case WM8994_GP_FN_IRQ:
144d0ad5e89SMark Brown return "IRQ";
145d0ad5e89SMark Brown case WM8994_GP_FN_TEMPERATURE:
146d0ad5e89SMark Brown return "Temperature";
147d0ad5e89SMark Brown case WM8994_GP_FN_MICBIAS1_DET:
148d0ad5e89SMark Brown return "MICBIAS1 detect";
149d0ad5e89SMark Brown case WM8994_GP_FN_MICBIAS1_SHORT:
150d0ad5e89SMark Brown return "MICBIAS1 short";
151d0ad5e89SMark Brown case WM8994_GP_FN_MICBIAS2_DET:
152d0ad5e89SMark Brown return "MICBIAS2 detect";
153d0ad5e89SMark Brown case WM8994_GP_FN_MICBIAS2_SHORT:
154d0ad5e89SMark Brown return "MICBIAS2 short";
155d0ad5e89SMark Brown case WM8994_GP_FN_FLL1_LOCK:
156d0ad5e89SMark Brown return "FLL1 lock";
157d0ad5e89SMark Brown case WM8994_GP_FN_FLL2_LOCK:
158d0ad5e89SMark Brown return "FLL2 lock";
159d0ad5e89SMark Brown case WM8994_GP_FN_SRC1_LOCK:
160d0ad5e89SMark Brown return "SRC1 lock";
161d0ad5e89SMark Brown case WM8994_GP_FN_SRC2_LOCK:
162d0ad5e89SMark Brown return "SRC2 lock";
163d0ad5e89SMark Brown case WM8994_GP_FN_DRC1_ACT:
164d0ad5e89SMark Brown return "DRC1 activity";
165d0ad5e89SMark Brown case WM8994_GP_FN_DRC2_ACT:
166d0ad5e89SMark Brown return "DRC2 activity";
167d0ad5e89SMark Brown case WM8994_GP_FN_DRC3_ACT:
168d0ad5e89SMark Brown return "DRC3 activity";
169d0ad5e89SMark Brown case WM8994_GP_FN_WSEQ_STATUS:
170d0ad5e89SMark Brown return "Write sequencer";
171d0ad5e89SMark Brown case WM8994_GP_FN_FIFO_ERROR:
172d0ad5e89SMark Brown return "FIFO error";
173d0ad5e89SMark Brown case WM8994_GP_FN_OPCLK:
174d0ad5e89SMark Brown return "OPCLK";
175d0ad5e89SMark Brown case WM8994_GP_FN_THW:
176d0ad5e89SMark Brown return "Thermal warning";
177d0ad5e89SMark Brown case WM8994_GP_FN_DCS_DONE:
178d0ad5e89SMark Brown return "DC servo";
179d0ad5e89SMark Brown case WM8994_GP_FN_FLL1_OUT:
180d0ad5e89SMark Brown return "FLL1 output";
181d0ad5e89SMark Brown case WM8994_GP_FN_FLL2_OUT:
182d0ad5e89SMark Brown return "FLL1 output";
183d0ad5e89SMark Brown default:
184d0ad5e89SMark Brown return "Unknown";
185d0ad5e89SMark Brown }
186d0ad5e89SMark Brown }
187d0ad5e89SMark Brown
wm8994_gpio_dbg_show(struct seq_file * s,struct gpio_chip * chip)188c103de24SGrant Likely static void wm8994_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
189c103de24SGrant Likely {
190765aa587SLinus Walleij struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);
191c103de24SGrant Likely struct wm8994 *wm8994 = wm8994_gpio->wm8994;
192c103de24SGrant Likely int i;
193c103de24SGrant Likely
194c103de24SGrant Likely for (i = 0; i < chip->ngpio; i++) {
195c103de24SGrant Likely int gpio = i + chip->base;
196c103de24SGrant Likely int reg;
197c103de24SGrant Likely
198c103de24SGrant Likely /* We report the GPIO even if it's not requested since
199c103de24SGrant Likely * we're also reporting things like alternate
200c103de24SGrant Likely * functions which apply even when the GPIO is not in
201c103de24SGrant Likely * use as a GPIO.
202c103de24SGrant Likely */
203*abeec1adSBartosz Golaszewski char *label __free(kfree) = gpiochip_dup_line_label(chip, i);
204*abeec1adSBartosz Golaszewski if (IS_ERR(label)) {
205*abeec1adSBartosz Golaszewski dev_err(wm8994->dev, "Failed to duplicate label\n");
206*abeec1adSBartosz Golaszewski continue;
207*abeec1adSBartosz Golaszewski }
208c103de24SGrant Likely
209*abeec1adSBartosz Golaszewski seq_printf(s, " gpio-%-3d (%-20.20s) ", gpio,
210*abeec1adSBartosz Golaszewski label ?: "Unrequested");
211c103de24SGrant Likely
212c103de24SGrant Likely reg = wm8994_reg_read(wm8994, WM8994_GPIO_1 + i);
213c103de24SGrant Likely if (reg < 0) {
214c103de24SGrant Likely dev_err(wm8994->dev,
215c103de24SGrant Likely "GPIO control %d read failed: %d\n",
216c103de24SGrant Likely gpio, reg);
217c103de24SGrant Likely seq_printf(s, "\n");
218c103de24SGrant Likely continue;
219c103de24SGrant Likely }
220c103de24SGrant Likely
221d0ad5e89SMark Brown if (reg & WM8994_GPN_DIR)
222d0ad5e89SMark Brown seq_printf(s, "in ");
223d0ad5e89SMark Brown else
224d0ad5e89SMark Brown seq_printf(s, "out ");
225d0ad5e89SMark Brown
226d0ad5e89SMark Brown if (reg & WM8994_GPN_PU)
227d0ad5e89SMark Brown seq_printf(s, "pull up ");
228d0ad5e89SMark Brown
229d0ad5e89SMark Brown if (reg & WM8994_GPN_PD)
230d0ad5e89SMark Brown seq_printf(s, "pull down ");
231d0ad5e89SMark Brown
232d0ad5e89SMark Brown if (reg & WM8994_GPN_POL)
233d0ad5e89SMark Brown seq_printf(s, "inverted ");
234d0ad5e89SMark Brown else
235d0ad5e89SMark Brown seq_printf(s, "noninverted ");
236d0ad5e89SMark Brown
237d0ad5e89SMark Brown if (reg & WM8994_GPN_OP_CFG)
238d0ad5e89SMark Brown seq_printf(s, "open drain ");
239d0ad5e89SMark Brown else
240190ea434SLinus Walleij seq_printf(s, "push-pull ");
241d0ad5e89SMark Brown
242d0ad5e89SMark Brown seq_printf(s, "%s (%x)\n",
243d0ad5e89SMark Brown wm8994_gpio_fn(reg & WM8994_GPN_FN_MASK), reg);
244c103de24SGrant Likely }
245c103de24SGrant Likely }
246c103de24SGrant Likely #else
247c103de24SGrant Likely #define wm8994_gpio_dbg_show NULL
248c103de24SGrant Likely #endif
249c103de24SGrant Likely
250e35b5ab0SJulia Lawall static const struct gpio_chip template_chip = {
251c103de24SGrant Likely .label = "wm8994",
252c103de24SGrant Likely .owner = THIS_MODULE,
253c103de24SGrant Likely .request = wm8994_gpio_request,
254c103de24SGrant Likely .direction_input = wm8994_gpio_direction_in,
255c103de24SGrant Likely .get = wm8994_gpio_get,
256c103de24SGrant Likely .direction_output = wm8994_gpio_direction_out,
257c103de24SGrant Likely .set = wm8994_gpio_set,
2582956b5d9SMika Westerberg .set_config = wm8994_gpio_set_config,
259c103de24SGrant Likely .to_irq = wm8994_gpio_to_irq,
260c103de24SGrant Likely .dbg_show = wm8994_gpio_dbg_show,
2619fb1f39eSLinus Walleij .can_sleep = true,
262c103de24SGrant Likely };
263c103de24SGrant Likely
wm8994_gpio_probe(struct platform_device * pdev)2643836309dSBill Pemberton static int wm8994_gpio_probe(struct platform_device *pdev)
265c103de24SGrant Likely {
266c103de24SGrant Likely struct wm8994 *wm8994 = dev_get_drvdata(pdev->dev.parent);
267e56aee18SJingoo Han struct wm8994_pdata *pdata = dev_get_platdata(wm8994->dev);
268c103de24SGrant Likely struct wm8994_gpio *wm8994_gpio;
269c103de24SGrant Likely
270f8d203c0SMark Brown wm8994_gpio = devm_kzalloc(&pdev->dev, sizeof(*wm8994_gpio),
271f8d203c0SMark Brown GFP_KERNEL);
272c103de24SGrant Likely if (wm8994_gpio == NULL)
273c103de24SGrant Likely return -ENOMEM;
274c103de24SGrant Likely
275c103de24SGrant Likely wm8994_gpio->wm8994 = wm8994;
276c103de24SGrant Likely wm8994_gpio->gpio_chip = template_chip;
277c103de24SGrant Likely wm8994_gpio->gpio_chip.ngpio = WM8994_GPIO_MAX;
27858383c78SLinus Walleij wm8994_gpio->gpio_chip.parent = &pdev->dev;
279c103de24SGrant Likely if (pdata && pdata->gpio_base)
280c103de24SGrant Likely wm8994_gpio->gpio_chip.base = pdata->gpio_base;
281c103de24SGrant Likely else
282c103de24SGrant Likely wm8994_gpio->gpio_chip.base = -1;
283c103de24SGrant Likely
284e076aedaSAlexandru Ardelean return devm_gpiochip_add_data(&pdev->dev, &wm8994_gpio->gpio_chip, wm8994_gpio);
285c103de24SGrant Likely }
286c103de24SGrant Likely
287c103de24SGrant Likely static struct platform_driver wm8994_gpio_driver = {
288c103de24SGrant Likely .driver.name = "wm8994-gpio",
289c103de24SGrant Likely .probe = wm8994_gpio_probe,
290c103de24SGrant Likely };
291c103de24SGrant Likely
wm8994_gpio_init(void)292c103de24SGrant Likely static int __init wm8994_gpio_init(void)
293c103de24SGrant Likely {
294c103de24SGrant Likely return platform_driver_register(&wm8994_gpio_driver);
295c103de24SGrant Likely }
296c103de24SGrant Likely subsys_initcall(wm8994_gpio_init);
297c103de24SGrant Likely
wm8994_gpio_exit(void)298c103de24SGrant Likely static void __exit wm8994_gpio_exit(void)
299c103de24SGrant Likely {
300c103de24SGrant Likely platform_driver_unregister(&wm8994_gpio_driver);
301c103de24SGrant Likely }
302c103de24SGrant Likely module_exit(wm8994_gpio_exit);
303c103de24SGrant Likely
304c103de24SGrant Likely MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
305c103de24SGrant Likely MODULE_DESCRIPTION("GPIO interface for WM8994");
306c103de24SGrant Likely MODULE_LICENSE("GPL");
307c103de24SGrant Likely MODULE_ALIAS("platform:wm8994-gpio");
308