2 * MAXIM MAX77620 GPIO driver
4 * Copyright (c) 2016, NVIDIA CORPORATION. All rights reserved.
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms and conditions of the GNU General Public License,
8 * version 2, as published by the Free Software Foundation.
11 #include <linux/gpio/driver.h>
12 #include <linux/interrupt.h>
13 #include <linux/mfd/max77620.h>
14 #include <linux/module.h>
15 #include <linux/platform_device.h>
16 #include <linux/regmap.h>
18 #define GPIO_REG_ADDR(offset) (MAX77620_REG_GPIO0 + offset)
20 struct max77620_gpio {
21 struct gpio_chip gpio_chip;
26 static const struct regmap_irq max77620_gpio_irqs[] = {
28 .mask = MAX77620_IRQ_LVL2_GPIO_EDGE0,
29 .type_rising_mask = MAX77620_CNFG_GPIO_INT_RISING,
30 .type_falling_mask = MAX77620_CNFG_GPIO_INT_FALLING,
35 .mask = MAX77620_IRQ_LVL2_GPIO_EDGE1,
36 .type_rising_mask = MAX77620_CNFG_GPIO_INT_RISING,
37 .type_falling_mask = MAX77620_CNFG_GPIO_INT_FALLING,
42 .mask = MAX77620_IRQ_LVL2_GPIO_EDGE2,
43 .type_rising_mask = MAX77620_CNFG_GPIO_INT_RISING,
44 .type_falling_mask = MAX77620_CNFG_GPIO_INT_FALLING,
49 .mask = MAX77620_IRQ_LVL2_GPIO_EDGE3,
50 .type_rising_mask = MAX77620_CNFG_GPIO_INT_RISING,
51 .type_falling_mask = MAX77620_CNFG_GPIO_INT_FALLING,
56 .mask = MAX77620_IRQ_LVL2_GPIO_EDGE4,
57 .type_rising_mask = MAX77620_CNFG_GPIO_INT_RISING,
58 .type_falling_mask = MAX77620_CNFG_GPIO_INT_FALLING,
63 .mask = MAX77620_IRQ_LVL2_GPIO_EDGE5,
64 .type_rising_mask = MAX77620_CNFG_GPIO_INT_RISING,
65 .type_falling_mask = MAX77620_CNFG_GPIO_INT_FALLING,
70 .mask = MAX77620_IRQ_LVL2_GPIO_EDGE6,
71 .type_rising_mask = MAX77620_CNFG_GPIO_INT_RISING,
72 .type_falling_mask = MAX77620_CNFG_GPIO_INT_FALLING,
77 .mask = MAX77620_IRQ_LVL2_GPIO_EDGE7,
78 .type_rising_mask = MAX77620_CNFG_GPIO_INT_RISING,
79 .type_falling_mask = MAX77620_CNFG_GPIO_INT_FALLING,
85 static const struct regmap_irq_chip max77620_gpio_irq_chip = {
86 .name = "max77620-gpio",
87 .irqs = max77620_gpio_irqs,
88 .num_irqs = ARRAY_SIZE(max77620_gpio_irqs),
93 .status_base = MAX77620_REG_IRQ_LVL2_GPIO,
94 .type_base = MAX77620_REG_GPIO0,
97 static int max77620_gpio_dir_input(struct gpio_chip *gc, unsigned int offset)
99 struct max77620_gpio *mgpio = gpiochip_get_data(gc);
102 ret = regmap_update_bits(mgpio->rmap, GPIO_REG_ADDR(offset),
103 MAX77620_CNFG_GPIO_DIR_MASK,
104 MAX77620_CNFG_GPIO_DIR_INPUT);
106 dev_err(mgpio->dev, "CNFG_GPIOx dir update failed: %d\n", ret);
111 static int max77620_gpio_get(struct gpio_chip *gc, unsigned int offset)
113 struct max77620_gpio *mgpio = gpiochip_get_data(gc);
117 ret = regmap_read(mgpio->rmap, GPIO_REG_ADDR(offset), &val);
119 dev_err(mgpio->dev, "CNFG_GPIOx read failed: %d\n", ret);
123 if (val & MAX77620_CNFG_GPIO_DIR_MASK)
124 return !!(val & MAX77620_CNFG_GPIO_INPUT_VAL_MASK);
126 return !!(val & MAX77620_CNFG_GPIO_OUTPUT_VAL_MASK);
129 static int max77620_gpio_dir_output(struct gpio_chip *gc, unsigned int offset,
132 struct max77620_gpio *mgpio = gpiochip_get_data(gc);
136 val = (value) ? MAX77620_CNFG_GPIO_OUTPUT_VAL_HIGH :
137 MAX77620_CNFG_GPIO_OUTPUT_VAL_LOW;
139 ret = regmap_update_bits(mgpio->rmap, GPIO_REG_ADDR(offset),
140 MAX77620_CNFG_GPIO_OUTPUT_VAL_MASK, val);
142 dev_err(mgpio->dev, "CNFG_GPIOx val update failed: %d\n", ret);
146 ret = regmap_update_bits(mgpio->rmap, GPIO_REG_ADDR(offset),
147 MAX77620_CNFG_GPIO_DIR_MASK,
148 MAX77620_CNFG_GPIO_DIR_OUTPUT);
150 dev_err(mgpio->dev, "CNFG_GPIOx dir update failed: %d\n", ret);
155 static int max77620_gpio_set_debounce(struct max77620_gpio *mgpio,
157 unsigned int debounce)
164 val = MAX77620_CNFG_GPIO_DBNC_None;
167 val = MAX77620_CNFG_GPIO_DBNC_8ms;
170 val = MAX77620_CNFG_GPIO_DBNC_16ms;
173 val = MAX77620_CNFG_GPIO_DBNC_32ms;
176 dev_err(mgpio->dev, "Illegal value %u\n", debounce);
180 ret = regmap_update_bits(mgpio->rmap, GPIO_REG_ADDR(offset),
181 MAX77620_CNFG_GPIO_DBNC_MASK, val);
183 dev_err(mgpio->dev, "CNFG_GPIOx_DBNC update failed: %d\n", ret);
188 static void max77620_gpio_set(struct gpio_chip *gc, unsigned int offset,
191 struct max77620_gpio *mgpio = gpiochip_get_data(gc);
195 val = (value) ? MAX77620_CNFG_GPIO_OUTPUT_VAL_HIGH :
196 MAX77620_CNFG_GPIO_OUTPUT_VAL_LOW;
198 ret = regmap_update_bits(mgpio->rmap, GPIO_REG_ADDR(offset),
199 MAX77620_CNFG_GPIO_OUTPUT_VAL_MASK, val);
201 dev_err(mgpio->dev, "CNFG_GPIO_OUT update failed: %d\n", ret);
204 static int max77620_gpio_set_config(struct gpio_chip *gc, unsigned int offset,
205 unsigned long config)
207 struct max77620_gpio *mgpio = gpiochip_get_data(gc);
209 switch (pinconf_to_config_param(config)) {
210 case PIN_CONFIG_DRIVE_OPEN_DRAIN:
211 return regmap_update_bits(mgpio->rmap, GPIO_REG_ADDR(offset),
212 MAX77620_CNFG_GPIO_DRV_MASK,
213 MAX77620_CNFG_GPIO_DRV_OPENDRAIN);
214 case PIN_CONFIG_DRIVE_PUSH_PULL:
215 return regmap_update_bits(mgpio->rmap, GPIO_REG_ADDR(offset),
216 MAX77620_CNFG_GPIO_DRV_MASK,
217 MAX77620_CNFG_GPIO_DRV_PUSHPULL);
218 case PIN_CONFIG_INPUT_DEBOUNCE:
219 return max77620_gpio_set_debounce(mgpio, offset,
220 pinconf_to_config_argument(config));
228 static int max77620_gpio_to_irq(struct gpio_chip *gc, unsigned int offset)
230 struct max77620_gpio *mgpio = gpiochip_get_data(gc);
231 struct max77620_chip *chip = dev_get_drvdata(mgpio->dev->parent);
233 return regmap_irq_get_virq(chip->gpio_irq_data, offset);
236 static int max77620_gpio_probe(struct platform_device *pdev)
238 struct max77620_chip *chip = dev_get_drvdata(pdev->dev.parent);
239 struct max77620_gpio *mgpio;
243 gpio_irq = platform_get_irq(pdev, 0);
245 dev_err(&pdev->dev, "GPIO irq not available %d\n", gpio_irq);
249 mgpio = devm_kzalloc(&pdev->dev, sizeof(*mgpio), GFP_KERNEL);
253 mgpio->rmap = chip->rmap;
254 mgpio->dev = &pdev->dev;
256 mgpio->gpio_chip.label = pdev->name;
257 mgpio->gpio_chip.parent = &pdev->dev;
258 mgpio->gpio_chip.direction_input = max77620_gpio_dir_input;
259 mgpio->gpio_chip.get = max77620_gpio_get;
260 mgpio->gpio_chip.direction_output = max77620_gpio_dir_output;
261 mgpio->gpio_chip.set = max77620_gpio_set;
262 mgpio->gpio_chip.set_config = max77620_gpio_set_config;
263 mgpio->gpio_chip.to_irq = max77620_gpio_to_irq;
264 mgpio->gpio_chip.ngpio = MAX77620_GPIO_NR;
265 mgpio->gpio_chip.can_sleep = 1;
266 mgpio->gpio_chip.base = -1;
267 #ifdef CONFIG_OF_GPIO
268 mgpio->gpio_chip.of_node = pdev->dev.parent->of_node;
271 platform_set_drvdata(pdev, mgpio);
273 ret = devm_gpiochip_add_data(&pdev->dev, &mgpio->gpio_chip, mgpio);
275 dev_err(&pdev->dev, "gpio_init: Failed to add max77620_gpio\n");
279 ret = devm_regmap_add_irq_chip(&pdev->dev, chip->rmap, gpio_irq,
281 &max77620_gpio_irq_chip,
282 &chip->gpio_irq_data);
284 dev_err(&pdev->dev, "Failed to add gpio irq_chip %d\n", ret);
291 static const struct platform_device_id max77620_gpio_devtype[] = {
292 { .name = "max77620-gpio", },
293 { .name = "max20024-gpio", },
296 MODULE_DEVICE_TABLE(platform, max77620_gpio_devtype);
298 static struct platform_driver max77620_gpio_driver = {
299 .driver.name = "max77620-gpio",
300 .probe = max77620_gpio_probe,
301 .id_table = max77620_gpio_devtype,
304 module_platform_driver(max77620_gpio_driver);
306 MODULE_DESCRIPTION("GPIO interface for MAX77620 and MAX20024 PMIC");
307 MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
308 MODULE_AUTHOR("Chaitanya Bandi <bandik@nvidia.com>");
309 MODULE_ALIAS("platform:max77620-gpio");
310 MODULE_LICENSE("GPL v2");