1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Dialog DA9062 pinctrl and GPIO driver.
4 * Based on DA9055 GPIO driver.
5 *
6 * TODO:
7 * - add pinmux and pinctrl support (gpio alternate mode)
8 *
9 * Documents:
10 * [1] https://www.dialog-semiconductor.com/sites/default/files/da9062_datasheet_3v6.pdf
11 *
12 * Copyright (C) 2019 Pengutronix, Marco Felsch <kernel@pengutronix.de>
13 */
14#include <linux/bits.h>
15#include <linux/module.h>
16#include <linux/platform_device.h>
17#include <linux/property.h>
18#include <linux/regmap.h>
19
20#include <linux/gpio/consumer.h>
21#include <linux/gpio/driver.h>
22
23#include <linux/mfd/da9062/core.h>
24#include <linux/mfd/da9062/registers.h>
25
26#define DA9062_TYPE(offset) (4 * (offset % 2))
27#define DA9062_PIN_SHIFT(offset) (4 * (offset % 2))
28#define DA9062_PIN_ALTERNATE 0x00 /* gpio alternate mode */
29#define DA9062_PIN_GPI 0x01 /* gpio in */
30#define DA9062_PIN_GPO_OD 0x02 /* gpio out open-drain */
31#define DA9062_PIN_GPO_PP 0x03 /* gpio out push-pull */
32#define DA9062_GPIO_NUM 5
33
34struct da9062_pctl {
35 struct da9062 *da9062;
36 struct gpio_chip gc;
37 unsigned int pin_config[DA9062_GPIO_NUM];
38};
39
40static int da9062_pctl_get_pin_mode(struct da9062_pctl *pctl,
41 unsigned int offset)
42{
43 struct regmap *regmap = pctl->da9062->regmap;
44 int ret, val;
45
46 ret = regmap_read(map: regmap, DA9062AA_GPIO_0_1 + (offset >> 1), val: &val);
47 if (ret < 0)
48 return ret;
49
50 val >>= DA9062_PIN_SHIFT(offset);
51 val &= DA9062AA_GPIO0_PIN_MASK;
52
53 return val;
54}
55
56static int da9062_pctl_set_pin_mode(struct da9062_pctl *pctl,
57 unsigned int offset, unsigned int mode_req)
58{
59 struct regmap *regmap = pctl->da9062->regmap;
60 unsigned int mode = mode_req;
61 unsigned int mask;
62 int ret;
63
64 mode &= DA9062AA_GPIO0_PIN_MASK;
65 mode <<= DA9062_PIN_SHIFT(offset);
66 mask = DA9062AA_GPIO0_PIN_MASK << DA9062_PIN_SHIFT(offset);
67
68 ret = regmap_update_bits(map: regmap, DA9062AA_GPIO_0_1 + (offset >> 1),
69 mask, val: mode);
70 if (!ret)
71 pctl->pin_config[offset] = mode_req;
72
73 return ret;
74}
75
76static int da9062_gpio_get(struct gpio_chip *gc, unsigned int offset)
77{
78 struct da9062_pctl *pctl = gpiochip_get_data(gc);
79 struct regmap *regmap = pctl->da9062->regmap;
80 int gpio_mode, val;
81 int ret;
82
83 gpio_mode = da9062_pctl_get_pin_mode(pctl, offset);
84 if (gpio_mode < 0)
85 return gpio_mode;
86
87 switch (gpio_mode) {
88 case DA9062_PIN_ALTERNATE:
89 return -ENOTSUPP;
90 case DA9062_PIN_GPI:
91 ret = regmap_read(map: regmap, DA9062AA_STATUS_B, val: &val);
92 if (ret < 0)
93 return ret;
94 break;
95 case DA9062_PIN_GPO_OD:
96 case DA9062_PIN_GPO_PP:
97 ret = regmap_read(map: regmap, DA9062AA_GPIO_MODE0_4, val: &val);
98 if (ret < 0)
99 return ret;
100 }
101
102 return !!(val & BIT(offset));
103}
104
105static void da9062_gpio_set(struct gpio_chip *gc, unsigned int offset,
106 int value)
107{
108 struct da9062_pctl *pctl = gpiochip_get_data(gc);
109 struct regmap *regmap = pctl->da9062->regmap;
110
111 regmap_update_bits(map: regmap, DA9062AA_GPIO_MODE0_4, BIT(offset),
112 val: value << offset);
113}
114
115static int da9062_gpio_get_direction(struct gpio_chip *gc, unsigned int offset)
116{
117 struct da9062_pctl *pctl = gpiochip_get_data(gc);
118 int gpio_mode;
119
120 gpio_mode = da9062_pctl_get_pin_mode(pctl, offset);
121 if (gpio_mode < 0)
122 return gpio_mode;
123
124 switch (gpio_mode) {
125 case DA9062_PIN_ALTERNATE:
126 return -ENOTSUPP;
127 case DA9062_PIN_GPI:
128 return GPIO_LINE_DIRECTION_IN;
129 case DA9062_PIN_GPO_OD:
130 case DA9062_PIN_GPO_PP:
131 return GPIO_LINE_DIRECTION_OUT;
132 }
133
134 return -EINVAL;
135}
136
137static int da9062_gpio_direction_input(struct gpio_chip *gc,
138 unsigned int offset)
139{
140 struct da9062_pctl *pctl = gpiochip_get_data(gc);
141 struct regmap *regmap = pctl->da9062->regmap;
142 struct gpio_desc *desc = gpiochip_get_desc(gc, hwnum: offset);
143 unsigned int gpi_type;
144 int ret;
145
146 ret = da9062_pctl_set_pin_mode(pctl, offset, DA9062_PIN_GPI);
147 if (ret)
148 return ret;
149
150 /*
151 * If the gpio is active low we should set it in hw too. No worries
152 * about gpio_get() because we read and return the gpio-level. So the
153 * gpiolib active_low handling is still correct.
154 *
155 * 0 - active low, 1 - active high
156 */
157 gpi_type = !gpiod_is_active_low(desc);
158
159 return regmap_update_bits(map: regmap, DA9062AA_GPIO_0_1 + (offset >> 1),
160 DA9062AA_GPIO0_TYPE_MASK << DA9062_TYPE(offset),
161 val: gpi_type << DA9062_TYPE(offset));
162}
163
164static int da9062_gpio_direction_output(struct gpio_chip *gc,
165 unsigned int offset, int value)
166{
167 struct da9062_pctl *pctl = gpiochip_get_data(gc);
168 unsigned int pin_config = pctl->pin_config[offset];
169 int ret;
170
171 ret = da9062_pctl_set_pin_mode(pctl, offset, mode_req: pin_config);
172 if (ret)
173 return ret;
174
175 da9062_gpio_set(gc, offset, value);
176
177 return 0;
178}
179
180static int da9062_gpio_set_config(struct gpio_chip *gc, unsigned int offset,
181 unsigned long config)
182{
183 struct da9062_pctl *pctl = gpiochip_get_data(gc);
184 struct regmap *regmap = pctl->da9062->regmap;
185 int gpio_mode;
186
187 /*
188 * We need to meet the following restrictions [1, Figure 18]:
189 * - PIN_CONFIG_BIAS_PULL_DOWN -> only allowed if the pin is used as
190 * gpio input
191 * - PIN_CONFIG_BIAS_PULL_UP -> only allowed if the pin is used as
192 * gpio output open-drain.
193 */
194
195 switch (pinconf_to_config_param(config)) {
196 case PIN_CONFIG_BIAS_DISABLE:
197 return regmap_update_bits(map: regmap, DA9062AA_CONFIG_K,
198 BIT(offset), val: 0);
199 case PIN_CONFIG_BIAS_PULL_DOWN:
200 gpio_mode = da9062_pctl_get_pin_mode(pctl, offset);
201 if (gpio_mode < 0)
202 return -EINVAL;
203 else if (gpio_mode != DA9062_PIN_GPI)
204 return -ENOTSUPP;
205 return regmap_update_bits(map: regmap, DA9062AA_CONFIG_K,
206 BIT(offset), BIT(offset));
207 case PIN_CONFIG_BIAS_PULL_UP:
208 gpio_mode = da9062_pctl_get_pin_mode(pctl, offset);
209 if (gpio_mode < 0)
210 return -EINVAL;
211 else if (gpio_mode != DA9062_PIN_GPO_OD)
212 return -ENOTSUPP;
213 return regmap_update_bits(map: regmap, DA9062AA_CONFIG_K,
214 BIT(offset), BIT(offset));
215 case PIN_CONFIG_DRIVE_OPEN_DRAIN:
216 return da9062_pctl_set_pin_mode(pctl, offset,
217 DA9062_PIN_GPO_OD);
218 case PIN_CONFIG_DRIVE_PUSH_PULL:
219 return da9062_pctl_set_pin_mode(pctl, offset,
220 DA9062_PIN_GPO_PP);
221 default:
222 return -ENOTSUPP;
223 }
224}
225
226static int da9062_gpio_to_irq(struct gpio_chip *gc, unsigned int offset)
227{
228 struct da9062_pctl *pctl = gpiochip_get_data(gc);
229 struct da9062 *da9062 = pctl->da9062;
230
231 return regmap_irq_get_virq(data: da9062->regmap_irq,
232 irq: DA9062_IRQ_GPI0 + offset);
233}
234
235static const struct gpio_chip reference_gc = {
236 .owner = THIS_MODULE,
237 .get = da9062_gpio_get,
238 .set = da9062_gpio_set,
239 .get_direction = da9062_gpio_get_direction,
240 .direction_input = da9062_gpio_direction_input,
241 .direction_output = da9062_gpio_direction_output,
242 .set_config = da9062_gpio_set_config,
243 .to_irq = da9062_gpio_to_irq,
244 .can_sleep = true,
245 .ngpio = DA9062_GPIO_NUM,
246 .base = -1,
247};
248
249static int da9062_pctl_probe(struct platform_device *pdev)
250{
251 struct device *parent = pdev->dev.parent;
252 struct da9062_pctl *pctl;
253 int i;
254
255 device_set_node(dev: &pdev->dev, dev_fwnode(pdev->dev.parent));
256
257 pctl = devm_kzalloc(dev: &pdev->dev, size: sizeof(*pctl), GFP_KERNEL);
258 if (!pctl)
259 return -ENOMEM;
260
261 pctl->da9062 = dev_get_drvdata(dev: parent);
262 if (!pctl->da9062)
263 return -EINVAL;
264
265 if (!device_property_present(dev: parent, propname: "gpio-controller"))
266 return 0;
267
268 for (i = 0; i < ARRAY_SIZE(pctl->pin_config); i++)
269 pctl->pin_config[i] = DA9062_PIN_GPO_PP;
270
271 /*
272 * Currently the driver handles only the GPIO support. The
273 * pinctrl/pinmux support can be added later if needed.
274 */
275 pctl->gc = reference_gc;
276 pctl->gc.label = dev_name(dev: &pdev->dev);
277 pctl->gc.parent = &pdev->dev;
278
279 platform_set_drvdata(pdev, data: pctl);
280
281 return devm_gpiochip_add_data(&pdev->dev, &pctl->gc, pctl);
282}
283
284static struct platform_driver da9062_pctl_driver = {
285 .probe = da9062_pctl_probe,
286 .driver = {
287 .name = "da9062-gpio",
288 },
289};
290module_platform_driver(da9062_pctl_driver);
291
292MODULE_AUTHOR("Marco Felsch <kernel@pengutronix.de>");
293MODULE_DESCRIPTION("DA9062 PMIC pinctrl and GPIO Driver");
294MODULE_LICENSE("GPL v2");
295MODULE_ALIAS("platform:da9062-gpio");
296

source code of linux/drivers/pinctrl/pinctrl-da9062.c