1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * MAXIM MAX77620 GPIO driver
4 *
5 * Copyright (c) 2016, NVIDIA CORPORATION. All rights reserved.
6 */
7
8 #include <linux/gpio/driver.h>
9 #include <linux/interrupt.h>
10 #include <linux/mfd/max77620.h>
11 #include <linux/module.h>
12 #include <linux/platform_device.h>
13 #include <linux/regmap.h>
14
15 #define GPIO_REG_ADDR(offset) (MAX77620_REG_GPIO0 + offset)
16
17 struct max77620_gpio {
18 struct gpio_chip gpio_chip;
19 struct regmap *rmap;
20 struct device *dev;
21 };
22
23 static const struct regmap_irq max77620_gpio_irqs[] = {
24 [0] = {
25 .reg_offset = 0,
26 .mask = MAX77620_IRQ_LVL2_GPIO_EDGE0,
27 .type = {
28 .type_rising_val = MAX77620_CNFG_GPIO_INT_RISING,
29 .type_falling_val = MAX77620_CNFG_GPIO_INT_FALLING,
30 .type_reg_mask = MAX77620_CNFG_GPIO_INT_MASK,
31 .type_reg_offset = 0,
32 .types_supported = IRQ_TYPE_EDGE_BOTH,
33 },
34 },
35 [1] = {
36 .reg_offset = 0,
37 .mask = MAX77620_IRQ_LVL2_GPIO_EDGE1,
38 .type = {
39 .type_rising_val = MAX77620_CNFG_GPIO_INT_RISING,
40 .type_falling_val = MAX77620_CNFG_GPIO_INT_FALLING,
41 .type_reg_mask = MAX77620_CNFG_GPIO_INT_MASK,
42 .type_reg_offset = 1,
43 .types_supported = IRQ_TYPE_EDGE_BOTH,
44 },
45 },
46 [2] = {
47 .reg_offset = 0,
48 .mask = MAX77620_IRQ_LVL2_GPIO_EDGE2,
49 .type = {
50 .type_rising_val = MAX77620_CNFG_GPIO_INT_RISING,
51 .type_falling_val = MAX77620_CNFG_GPIO_INT_FALLING,
52 .type_reg_mask = MAX77620_CNFG_GPIO_INT_MASK,
53 .type_reg_offset = 2,
54 .types_supported = IRQ_TYPE_EDGE_BOTH,
55 },
56 },
57 [3] = {
58 .reg_offset = 0,
59 .mask = MAX77620_IRQ_LVL2_GPIO_EDGE3,
60 .type = {
61 .type_rising_val = MAX77620_CNFG_GPIO_INT_RISING,
62 .type_falling_val = MAX77620_CNFG_GPIO_INT_FALLING,
63 .type_reg_mask = MAX77620_CNFG_GPIO_INT_MASK,
64 .type_reg_offset = 3,
65 .types_supported = IRQ_TYPE_EDGE_BOTH,
66 },
67 },
68 [4] = {
69 .reg_offset = 0,
70 .mask = MAX77620_IRQ_LVL2_GPIO_EDGE4,
71 .type = {
72 .type_rising_val = MAX77620_CNFG_GPIO_INT_RISING,
73 .type_falling_val = MAX77620_CNFG_GPIO_INT_FALLING,
74 .type_reg_mask = MAX77620_CNFG_GPIO_INT_MASK,
75 .type_reg_offset = 4,
76 .types_supported = IRQ_TYPE_EDGE_BOTH,
77 },
78 },
79 [5] = {
80 .reg_offset = 0,
81 .mask = MAX77620_IRQ_LVL2_GPIO_EDGE5,
82 .type = {
83 .type_rising_val = MAX77620_CNFG_GPIO_INT_RISING,
84 .type_falling_val = MAX77620_CNFG_GPIO_INT_FALLING,
85 .type_reg_mask = MAX77620_CNFG_GPIO_INT_MASK,
86 .type_reg_offset = 5,
87 .types_supported = IRQ_TYPE_EDGE_BOTH,
88 },
89 },
90 [6] = {
91 .reg_offset = 0,
92 .mask = MAX77620_IRQ_LVL2_GPIO_EDGE6,
93 .type = {
94 .type_rising_val = MAX77620_CNFG_GPIO_INT_RISING,
95 .type_falling_val = MAX77620_CNFG_GPIO_INT_FALLING,
96 .type_reg_mask = MAX77620_CNFG_GPIO_INT_MASK,
97 .type_reg_offset = 6,
98 .types_supported = IRQ_TYPE_EDGE_BOTH,
99 },
100 },
101 [7] = {
102 .reg_offset = 0,
103 .mask = MAX77620_IRQ_LVL2_GPIO_EDGE7,
104 .type = {
105 .type_rising_val = MAX77620_CNFG_GPIO_INT_RISING,
106 .type_falling_val = MAX77620_CNFG_GPIO_INT_FALLING,
107 .type_reg_mask = MAX77620_CNFG_GPIO_INT_MASK,
108 .type_reg_offset = 7,
109 .types_supported = IRQ_TYPE_EDGE_BOTH,
110 },
111 },
112 };
113
114 static const struct regmap_irq_chip max77620_gpio_irq_chip = {
115 .name = "max77620-gpio",
116 .irqs = max77620_gpio_irqs,
117 .num_irqs = ARRAY_SIZE(max77620_gpio_irqs),
118 .num_regs = 1,
119 .num_type_reg = 8,
120 .irq_reg_stride = 1,
121 .type_reg_stride = 1,
122 .status_base = MAX77620_REG_IRQ_LVL2_GPIO,
123 .type_base = MAX77620_REG_GPIO0,
124 };
125
max77620_gpio_dir_input(struct gpio_chip * gc,unsigned int offset)126 static int max77620_gpio_dir_input(struct gpio_chip *gc, unsigned int offset)
127 {
128 struct max77620_gpio *mgpio = gpiochip_get_data(gc);
129 int ret;
130
131 ret = regmap_update_bits(mgpio->rmap, GPIO_REG_ADDR(offset),
132 MAX77620_CNFG_GPIO_DIR_MASK,
133 MAX77620_CNFG_GPIO_DIR_INPUT);
134 if (ret < 0)
135 dev_err(mgpio->dev, "CNFG_GPIOx dir update failed: %d\n", ret);
136
137 return ret;
138 }
139
max77620_gpio_get(struct gpio_chip * gc,unsigned int offset)140 static int max77620_gpio_get(struct gpio_chip *gc, unsigned int offset)
141 {
142 struct max77620_gpio *mgpio = gpiochip_get_data(gc);
143 unsigned int val;
144 int ret;
145
146 ret = regmap_read(mgpio->rmap, GPIO_REG_ADDR(offset), &val);
147 if (ret < 0) {
148 dev_err(mgpio->dev, "CNFG_GPIOx read failed: %d\n", ret);
149 return ret;
150 }
151
152 if (val & MAX77620_CNFG_GPIO_DIR_MASK)
153 return !!(val & MAX77620_CNFG_GPIO_INPUT_VAL_MASK);
154 else
155 return !!(val & MAX77620_CNFG_GPIO_OUTPUT_VAL_MASK);
156 }
157
max77620_gpio_dir_output(struct gpio_chip * gc,unsigned int offset,int value)158 static int max77620_gpio_dir_output(struct gpio_chip *gc, unsigned int offset,
159 int value)
160 {
161 struct max77620_gpio *mgpio = gpiochip_get_data(gc);
162 u8 val;
163 int ret;
164
165 val = (value) ? MAX77620_CNFG_GPIO_OUTPUT_VAL_HIGH :
166 MAX77620_CNFG_GPIO_OUTPUT_VAL_LOW;
167
168 ret = regmap_update_bits(mgpio->rmap, GPIO_REG_ADDR(offset),
169 MAX77620_CNFG_GPIO_OUTPUT_VAL_MASK, val);
170 if (ret < 0) {
171 dev_err(mgpio->dev, "CNFG_GPIOx val update failed: %d\n", ret);
172 return ret;
173 }
174
175 ret = regmap_update_bits(mgpio->rmap, GPIO_REG_ADDR(offset),
176 MAX77620_CNFG_GPIO_DIR_MASK,
177 MAX77620_CNFG_GPIO_DIR_OUTPUT);
178 if (ret < 0)
179 dev_err(mgpio->dev, "CNFG_GPIOx dir update failed: %d\n", ret);
180
181 return ret;
182 }
183
max77620_gpio_set_debounce(struct max77620_gpio * mgpio,unsigned int offset,unsigned int debounce)184 static int max77620_gpio_set_debounce(struct max77620_gpio *mgpio,
185 unsigned int offset,
186 unsigned int debounce)
187 {
188 u8 val;
189 int ret;
190
191 switch (debounce) {
192 case 0:
193 val = MAX77620_CNFG_GPIO_DBNC_None;
194 break;
195 case 1 ... 8000:
196 val = MAX77620_CNFG_GPIO_DBNC_8ms;
197 break;
198 case 8001 ... 16000:
199 val = MAX77620_CNFG_GPIO_DBNC_16ms;
200 break;
201 case 16001 ... 32000:
202 val = MAX77620_CNFG_GPIO_DBNC_32ms;
203 break;
204 default:
205 dev_err(mgpio->dev, "Illegal value %u\n", debounce);
206 return -EINVAL;
207 }
208
209 ret = regmap_update_bits(mgpio->rmap, GPIO_REG_ADDR(offset),
210 MAX77620_CNFG_GPIO_DBNC_MASK, val);
211 if (ret < 0)
212 dev_err(mgpio->dev, "CNFG_GPIOx_DBNC update failed: %d\n", ret);
213
214 return ret;
215 }
216
max77620_gpio_set(struct gpio_chip * gc,unsigned int offset,int value)217 static void max77620_gpio_set(struct gpio_chip *gc, unsigned int offset,
218 int value)
219 {
220 struct max77620_gpio *mgpio = gpiochip_get_data(gc);
221 u8 val;
222 int ret;
223
224 val = (value) ? MAX77620_CNFG_GPIO_OUTPUT_VAL_HIGH :
225 MAX77620_CNFG_GPIO_OUTPUT_VAL_LOW;
226
227 ret = regmap_update_bits(mgpio->rmap, GPIO_REG_ADDR(offset),
228 MAX77620_CNFG_GPIO_OUTPUT_VAL_MASK, val);
229 if (ret < 0)
230 dev_err(mgpio->dev, "CNFG_GPIO_OUT update failed: %d\n", ret);
231 }
232
max77620_gpio_set_config(struct gpio_chip * gc,unsigned int offset,unsigned long config)233 static int max77620_gpio_set_config(struct gpio_chip *gc, unsigned int offset,
234 unsigned long config)
235 {
236 struct max77620_gpio *mgpio = gpiochip_get_data(gc);
237
238 switch (pinconf_to_config_param(config)) {
239 case PIN_CONFIG_DRIVE_OPEN_DRAIN:
240 return regmap_update_bits(mgpio->rmap, GPIO_REG_ADDR(offset),
241 MAX77620_CNFG_GPIO_DRV_MASK,
242 MAX77620_CNFG_GPIO_DRV_OPENDRAIN);
243 case PIN_CONFIG_DRIVE_PUSH_PULL:
244 return regmap_update_bits(mgpio->rmap, GPIO_REG_ADDR(offset),
245 MAX77620_CNFG_GPIO_DRV_MASK,
246 MAX77620_CNFG_GPIO_DRV_PUSHPULL);
247 case PIN_CONFIG_INPUT_DEBOUNCE:
248 return max77620_gpio_set_debounce(mgpio, offset,
249 pinconf_to_config_argument(config));
250 default:
251 break;
252 }
253
254 return -ENOTSUPP;
255 }
256
max77620_gpio_to_irq(struct gpio_chip * gc,unsigned int offset)257 static int max77620_gpio_to_irq(struct gpio_chip *gc, unsigned int offset)
258 {
259 struct max77620_gpio *mgpio = gpiochip_get_data(gc);
260 struct max77620_chip *chip = dev_get_drvdata(mgpio->dev->parent);
261
262 return regmap_irq_get_virq(chip->gpio_irq_data, offset);
263 }
264
max77620_gpio_probe(struct platform_device * pdev)265 static int max77620_gpio_probe(struct platform_device *pdev)
266 {
267 struct max77620_chip *chip = dev_get_drvdata(pdev->dev.parent);
268 struct max77620_gpio *mgpio;
269 int gpio_irq;
270 int ret;
271
272 gpio_irq = platform_get_irq(pdev, 0);
273 if (gpio_irq <= 0)
274 return -ENODEV;
275
276 mgpio = devm_kzalloc(&pdev->dev, sizeof(*mgpio), GFP_KERNEL);
277 if (!mgpio)
278 return -ENOMEM;
279
280 mgpio->rmap = chip->rmap;
281 mgpio->dev = &pdev->dev;
282
283 mgpio->gpio_chip.label = pdev->name;
284 mgpio->gpio_chip.parent = &pdev->dev;
285 mgpio->gpio_chip.direction_input = max77620_gpio_dir_input;
286 mgpio->gpio_chip.get = max77620_gpio_get;
287 mgpio->gpio_chip.direction_output = max77620_gpio_dir_output;
288 mgpio->gpio_chip.set = max77620_gpio_set;
289 mgpio->gpio_chip.set_config = max77620_gpio_set_config;
290 mgpio->gpio_chip.to_irq = max77620_gpio_to_irq;
291 mgpio->gpio_chip.ngpio = MAX77620_GPIO_NR;
292 mgpio->gpio_chip.can_sleep = 1;
293 mgpio->gpio_chip.base = -1;
294 #ifdef CONFIG_OF_GPIO
295 mgpio->gpio_chip.of_node = pdev->dev.parent->of_node;
296 #endif
297
298 platform_set_drvdata(pdev, mgpio);
299
300 ret = devm_gpiochip_add_data(&pdev->dev, &mgpio->gpio_chip, mgpio);
301 if (ret < 0) {
302 dev_err(&pdev->dev, "gpio_init: Failed to add max77620_gpio\n");
303 return ret;
304 }
305
306 ret = devm_regmap_add_irq_chip(&pdev->dev, chip->rmap, gpio_irq,
307 IRQF_ONESHOT, -1,
308 &max77620_gpio_irq_chip,
309 &chip->gpio_irq_data);
310 if (ret < 0) {
311 dev_err(&pdev->dev, "Failed to add gpio irq_chip %d\n", ret);
312 return ret;
313 }
314
315 return 0;
316 }
317
318 static const struct platform_device_id max77620_gpio_devtype[] = {
319 { .name = "max77620-gpio", },
320 { .name = "max20024-gpio", },
321 {},
322 };
323 MODULE_DEVICE_TABLE(platform, max77620_gpio_devtype);
324
325 static struct platform_driver max77620_gpio_driver = {
326 .driver.name = "max77620-gpio",
327 .probe = max77620_gpio_probe,
328 .id_table = max77620_gpio_devtype,
329 };
330
331 module_platform_driver(max77620_gpio_driver);
332
333 MODULE_DESCRIPTION("GPIO interface for MAX77620 and MAX20024 PMIC");
334 MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
335 MODULE_AUTHOR("Chaitanya Bandi <bandik@nvidia.com>");
336 MODULE_ALIAS("platform:max77620-gpio");
337 MODULE_LICENSE("GPL v2");
338