1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * GPIO Driver for Dialog DA9052 PMICs.
5 * Copyright(c) 2011 Dialog Semiconductor Ltd.
7 * Author: David Dajun Chen <dchen@diasemi.com>
10 #include <linux/gpio/driver.h>
11 #include <linux/module.h>
12 #include <linux/platform_device.h>
13 #include <linux/syscalls.h>
14 #include <linux/uaccess.h>
16 #include <linux/mfd/da9052/da9052.h>
17 #include <linux/mfd/da9052/pdata.h>
18 #include <linux/mfd/da9052/reg.h>
20 #define DA9052_INPUT 1
21 #define DA9052_OUTPUT_OPENDRAIN 2
22 #define DA9052_OUTPUT_PUSHPULL 3
24 #define DA9052_SUPPLY_VDD_IO1 0
26 #define DA9052_DEBOUNCING_OFF 0
27 #define DA9052_DEBOUNCING_ON 1
29 #define DA9052_OUTPUT_LOWLEVEL 0
31 #define DA9052_ACTIVE_LOW 0
32 #define DA9052_ACTIVE_HIGH 1
34 #define DA9052_GPIO_MAX_PORTS_PER_REGISTER 8
35 #define DA9052_GPIO_SHIFT_COUNT(no) (no%8)
36 #define DA9052_GPIO_MASK_UPPER_NIBBLE 0xF0
37 #define DA9052_GPIO_MASK_LOWER_NIBBLE 0x0F
38 #define DA9052_GPIO_NIBBLE_SHIFT 4
39 #define DA9052_IRQ_GPI0 16
40 #define DA9052_GPIO_ODD_SHIFT 7
41 #define DA9052_GPIO_EVEN_SHIFT 3
44 struct da9052 *da9052;
48 static unsigned char da9052_gpio_port_odd(unsigned offset)
53 static int da9052_gpio_get(struct gpio_chip *gc, unsigned offset)
55 struct da9052_gpio *gpio = gpiochip_get_data(gc);
56 int da9052_port_direction = 0;
59 ret = da9052_reg_read(gpio->da9052,
60 DA9052_GPIO_0_1_REG + (offset >> 1));
64 if (da9052_gpio_port_odd(offset)) {
65 da9052_port_direction = ret & DA9052_GPIO_ODD_PORT_PIN;
66 da9052_port_direction >>= 4;
68 da9052_port_direction = ret & DA9052_GPIO_EVEN_PORT_PIN;
71 switch (da9052_port_direction) {
73 if (offset < DA9052_GPIO_MAX_PORTS_PER_REGISTER)
74 ret = da9052_reg_read(gpio->da9052,
77 ret = da9052_reg_read(gpio->da9052,
81 return !!(ret & (1 << DA9052_GPIO_SHIFT_COUNT(offset)));
82 case DA9052_OUTPUT_PUSHPULL:
83 if (da9052_gpio_port_odd(offset))
84 return !!(ret & DA9052_GPIO_ODD_PORT_MODE);
86 return !!(ret & DA9052_GPIO_EVEN_PORT_MODE);
92 static void da9052_gpio_set(struct gpio_chip *gc, unsigned offset, int value)
94 struct da9052_gpio *gpio = gpiochip_get_data(gc);
97 if (da9052_gpio_port_odd(offset)) {
98 ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
100 DA9052_GPIO_ODD_PORT_MODE,
101 value << DA9052_GPIO_ODD_SHIFT);
103 dev_err(gpio->da9052->dev,
104 "Failed to updated gpio odd reg,%d",
107 ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
109 DA9052_GPIO_EVEN_PORT_MODE,
110 value << DA9052_GPIO_EVEN_SHIFT);
112 dev_err(gpio->da9052->dev,
113 "Failed to updated gpio even reg,%d",
118 static int da9052_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
120 struct da9052_gpio *gpio = gpiochip_get_data(gc);
121 unsigned char register_value;
124 /* Format: function - 2 bits type - 1 bit mode - 1 bit */
125 register_value = DA9052_INPUT | DA9052_ACTIVE_LOW << 2 |
126 DA9052_DEBOUNCING_ON << 3;
128 if (da9052_gpio_port_odd(offset))
129 ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
131 DA9052_GPIO_MASK_UPPER_NIBBLE,
133 DA9052_GPIO_NIBBLE_SHIFT));
135 ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
137 DA9052_GPIO_MASK_LOWER_NIBBLE,
143 static int da9052_gpio_direction_output(struct gpio_chip *gc,
144 unsigned offset, int value)
146 struct da9052_gpio *gpio = gpiochip_get_data(gc);
147 unsigned char register_value;
150 /* Format: Function - 2 bits Type - 1 bit Mode - 1 bit */
151 register_value = DA9052_OUTPUT_PUSHPULL | DA9052_SUPPLY_VDD_IO1 << 2 |
154 if (da9052_gpio_port_odd(offset))
155 ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
157 DA9052_GPIO_MASK_UPPER_NIBBLE,
159 DA9052_GPIO_NIBBLE_SHIFT));
161 ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
163 DA9052_GPIO_MASK_LOWER_NIBBLE,
169 static int da9052_gpio_to_irq(struct gpio_chip *gc, u32 offset)
171 struct da9052_gpio *gpio = gpiochip_get_data(gc);
172 struct da9052 *da9052 = gpio->da9052;
176 irq = regmap_irq_get_virq(da9052->irq_data, DA9052_IRQ_GPI0 + offset);
181 static const struct gpio_chip reference_gp = {
182 .label = "da9052-gpio",
183 .owner = THIS_MODULE,
184 .get = da9052_gpio_get,
185 .set = da9052_gpio_set,
186 .direction_input = da9052_gpio_direction_input,
187 .direction_output = da9052_gpio_direction_output,
188 .to_irq = da9052_gpio_to_irq,
194 static int da9052_gpio_probe(struct platform_device *pdev)
196 struct da9052_gpio *gpio;
197 struct da9052_pdata *pdata;
199 gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
203 gpio->da9052 = dev_get_drvdata(pdev->dev.parent);
204 pdata = dev_get_platdata(gpio->da9052->dev);
206 gpio->gp = reference_gp;
207 if (pdata && pdata->gpio_base)
208 gpio->gp.base = pdata->gpio_base;
210 return devm_gpiochip_add_data(&pdev->dev, &gpio->gp, gpio);
213 static struct platform_driver da9052_gpio_driver = {
214 .probe = da9052_gpio_probe,
216 .name = "da9052-gpio",
220 module_platform_driver(da9052_gpio_driver);
222 MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
223 MODULE_DESCRIPTION("DA9052 GPIO Device Driver");
224 MODULE_LICENSE("GPL");
225 MODULE_ALIAS("platform:da9052-gpio");