2 * GPIO Driver for Dialog DA9052 PMICs.
4 * Copyright(c) 2011 Dialog Semiconductor Ltd.
6 * Author: David Dajun Chen <dchen@diasemi.com>
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the
10 * Free Software Foundation; either version 2 of the License, or (at your
11 * option) any later version.
14 #include <linux/module.h>
16 #include <linux/uaccess.h>
17 #include <linux/platform_device.h>
18 #include <linux/gpio/driver.h>
19 #include <linux/syscalls.h>
20 #include <linux/seq_file.h>
22 #include <linux/mfd/da9052/da9052.h>
23 #include <linux/mfd/da9052/reg.h>
24 #include <linux/mfd/da9052/pdata.h>
26 #define DA9052_INPUT 1
27 #define DA9052_OUTPUT_OPENDRAIN 2
28 #define DA9052_OUTPUT_PUSHPULL 3
30 #define DA9052_SUPPLY_VDD_IO1 0
32 #define DA9052_DEBOUNCING_OFF 0
33 #define DA9052_DEBOUNCING_ON 1
35 #define DA9052_OUTPUT_LOWLEVEL 0
37 #define DA9052_ACTIVE_LOW 0
38 #define DA9052_ACTIVE_HIGH 1
40 #define DA9052_GPIO_MAX_PORTS_PER_REGISTER 8
41 #define DA9052_GPIO_SHIFT_COUNT(no) (no%8)
42 #define DA9052_GPIO_MASK_UPPER_NIBBLE 0xF0
43 #define DA9052_GPIO_MASK_LOWER_NIBBLE 0x0F
44 #define DA9052_GPIO_NIBBLE_SHIFT 4
45 #define DA9052_IRQ_GPI0 16
46 #define DA9052_GPIO_ODD_SHIFT 7
47 #define DA9052_GPIO_EVEN_SHIFT 3
50 struct da9052 *da9052;
54 static unsigned char da9052_gpio_port_odd(unsigned offset)
59 static int da9052_gpio_get(struct gpio_chip *gc, unsigned offset)
61 struct da9052_gpio *gpio = gpiochip_get_data(gc);
62 int da9052_port_direction = 0;
65 ret = da9052_reg_read(gpio->da9052,
66 DA9052_GPIO_0_1_REG + (offset >> 1));
70 if (da9052_gpio_port_odd(offset)) {
71 da9052_port_direction = ret & DA9052_GPIO_ODD_PORT_PIN;
72 da9052_port_direction >>= 4;
74 da9052_port_direction = ret & DA9052_GPIO_EVEN_PORT_PIN;
77 switch (da9052_port_direction) {
79 if (offset < DA9052_GPIO_MAX_PORTS_PER_REGISTER)
80 ret = da9052_reg_read(gpio->da9052,
83 ret = da9052_reg_read(gpio->da9052,
87 return !!(ret & (1 << DA9052_GPIO_SHIFT_COUNT(offset)));
88 case DA9052_OUTPUT_PUSHPULL:
89 if (da9052_gpio_port_odd(offset))
90 return !!(ret & DA9052_GPIO_ODD_PORT_MODE);
92 return !!(ret & DA9052_GPIO_EVEN_PORT_MODE);
98 static void da9052_gpio_set(struct gpio_chip *gc, unsigned offset, int value)
100 struct da9052_gpio *gpio = gpiochip_get_data(gc);
103 if (da9052_gpio_port_odd(offset)) {
104 ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
106 DA9052_GPIO_ODD_PORT_MODE,
107 value << DA9052_GPIO_ODD_SHIFT);
109 dev_err(gpio->da9052->dev,
110 "Failed to updated gpio odd reg,%d",
113 ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
115 DA9052_GPIO_EVEN_PORT_MODE,
116 value << DA9052_GPIO_EVEN_SHIFT);
118 dev_err(gpio->da9052->dev,
119 "Failed to updated gpio even reg,%d",
124 static int da9052_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
126 struct da9052_gpio *gpio = gpiochip_get_data(gc);
127 unsigned char register_value;
130 /* Format: function - 2 bits type - 1 bit mode - 1 bit */
131 register_value = DA9052_INPUT | DA9052_ACTIVE_LOW << 2 |
132 DA9052_DEBOUNCING_ON << 3;
134 if (da9052_gpio_port_odd(offset))
135 ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
137 DA9052_GPIO_MASK_UPPER_NIBBLE,
139 DA9052_GPIO_NIBBLE_SHIFT));
141 ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
143 DA9052_GPIO_MASK_LOWER_NIBBLE,
149 static int da9052_gpio_direction_output(struct gpio_chip *gc,
150 unsigned offset, int value)
152 struct da9052_gpio *gpio = gpiochip_get_data(gc);
153 unsigned char register_value;
156 /* Format: Function - 2 bits Type - 1 bit Mode - 1 bit */
157 register_value = DA9052_OUTPUT_PUSHPULL | DA9052_SUPPLY_VDD_IO1 << 2 |
160 if (da9052_gpio_port_odd(offset))
161 ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
163 DA9052_GPIO_MASK_UPPER_NIBBLE,
165 DA9052_GPIO_NIBBLE_SHIFT));
167 ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
169 DA9052_GPIO_MASK_LOWER_NIBBLE,
175 static int da9052_gpio_to_irq(struct gpio_chip *gc, u32 offset)
177 struct da9052_gpio *gpio = gpiochip_get_data(gc);
178 struct da9052 *da9052 = gpio->da9052;
182 irq = regmap_irq_get_virq(da9052->irq_data, DA9052_IRQ_GPI0 + offset);
187 static const struct gpio_chip reference_gp = {
188 .label = "da9052-gpio",
189 .owner = THIS_MODULE,
190 .get = da9052_gpio_get,
191 .set = da9052_gpio_set,
192 .direction_input = da9052_gpio_direction_input,
193 .direction_output = da9052_gpio_direction_output,
194 .to_irq = da9052_gpio_to_irq,
200 static int da9052_gpio_probe(struct platform_device *pdev)
202 struct da9052_gpio *gpio;
203 struct da9052_pdata *pdata;
206 gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
210 gpio->da9052 = dev_get_drvdata(pdev->dev.parent);
211 pdata = dev_get_platdata(gpio->da9052->dev);
213 gpio->gp = reference_gp;
214 if (pdata && pdata->gpio_base)
215 gpio->gp.base = pdata->gpio_base;
217 ret = devm_gpiochip_add_data(&pdev->dev, &gpio->gp, gpio);
219 dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
223 platform_set_drvdata(pdev, gpio);
228 static struct platform_driver da9052_gpio_driver = {
229 .probe = da9052_gpio_probe,
231 .name = "da9052-gpio",
235 module_platform_driver(da9052_gpio_driver);
237 MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
238 MODULE_DESCRIPTION("DA9052 GPIO Device Driver");
239 MODULE_LICENSE("GPL");
240 MODULE_ALIAS("platform:da9052-gpio");