gpio-da9052.c

  1// SPDX-License-Identifier: GPL-2.0-or-later
  2/*
  3 * GPIO Driver for Dialog DA9052 PMICs.
  4 *
  5 * Copyright(c) 2011 Dialog Semiconductor Ltd.
  6 *
  7 * Author: David Dajun Chen <dchen@diasemi.com>
  8 */
  9#include <linux/fs.h>
 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>
 15
 16#include <linux/mfd/da9052/da9052.h>
 17#include <linux/mfd/da9052/pdata.h>
 18#include <linux/mfd/da9052/reg.h>
 19
 20#define DA9052_INPUT				1
 21#define DA9052_OUTPUT_OPENDRAIN		2
 22#define DA9052_OUTPUT_PUSHPULL			3
 23
 24#define DA9052_SUPPLY_VDD_IO1			0
 25
 26#define DA9052_DEBOUNCING_OFF			0
 27#define DA9052_DEBOUNCING_ON			1
 28
 29#define DA9052_OUTPUT_LOWLEVEL			0
 30
 31#define DA9052_ACTIVE_LOW			0
 32#define DA9052_ACTIVE_HIGH			1
 33
 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
 42
 43struct da9052_gpio {
 44	struct da9052 *da9052;
 45	struct gpio_chip gp;
 46};
 47
 48static unsigned char da9052_gpio_port_odd(unsigned offset)
 49{
 50	return offset % 2;
 51}
 52
 53static int da9052_gpio_get(struct gpio_chip *gc, unsigned offset)
 54{
 55	struct da9052_gpio *gpio = gpiochip_get_data(gc);
 56	int da9052_port_direction = 0;
 57	int ret;
 58
 59	ret = da9052_reg_read(gpio->da9052,
 60			      DA9052_GPIO_0_1_REG + (offset >> 1));
 61	if (ret < 0)
 62		return ret;
 63
 64	if (da9052_gpio_port_odd(offset)) {
 65		da9052_port_direction = ret & DA9052_GPIO_ODD_PORT_PIN;
 66		da9052_port_direction >>= 4;
 67	} else {
 68		da9052_port_direction = ret & DA9052_GPIO_EVEN_PORT_PIN;
 69	}
 70
 71	switch (da9052_port_direction) {
 72	case DA9052_INPUT:
 73		if (offset < DA9052_GPIO_MAX_PORTS_PER_REGISTER)
 74			ret = da9052_reg_read(gpio->da9052,
 75					      DA9052_STATUS_C_REG);
 76		else
 77			ret = da9052_reg_read(gpio->da9052,
 78					      DA9052_STATUS_D_REG);
 79		if (ret < 0)
 80			return ret;
 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);
 85		else
 86			return !!(ret & DA9052_GPIO_EVEN_PORT_MODE);
 87	default:
 88		return -EINVAL;
 89	}
 90}
 91
 92static int da9052_gpio_set(struct gpio_chip *gc, unsigned int offset, int value)
 93{
 94	struct da9052_gpio *gpio = gpiochip_get_data(gc);
 95
 96	if (da9052_gpio_port_odd(offset))
 97		return da9052_reg_update(gpio->da9052, (offset >> 1) +
 98					 DA9052_GPIO_0_1_REG,
 99					 DA9052_GPIO_ODD_PORT_MODE,
100					 value << DA9052_GPIO_ODD_SHIFT);
101
102	return da9052_reg_update(gpio->da9052,
103				 (offset >> 1) + DA9052_GPIO_0_1_REG,
104				 DA9052_GPIO_EVEN_PORT_MODE,
105				 value << DA9052_GPIO_EVEN_SHIFT);
106}
107
108static int da9052_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
109{
110	struct da9052_gpio *gpio = gpiochip_get_data(gc);
111	unsigned char register_value;
112	int ret;
113
114	/* Format: function - 2 bits type - 1 bit mode - 1 bit */
115	register_value = DA9052_INPUT | DA9052_ACTIVE_LOW << 2 |
116			 DA9052_DEBOUNCING_ON << 3;
117
118	if (da9052_gpio_port_odd(offset))
119		ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
120					DA9052_GPIO_0_1_REG,
121					DA9052_GPIO_MASK_UPPER_NIBBLE,
122					(register_value <<
123					DA9052_GPIO_NIBBLE_SHIFT));
124	else
125		ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
126					DA9052_GPIO_0_1_REG,
127					DA9052_GPIO_MASK_LOWER_NIBBLE,
128					register_value);
129
130	return ret;
131}
132
133static int da9052_gpio_direction_output(struct gpio_chip *gc,
134					unsigned offset, int value)
135{
136	struct da9052_gpio *gpio = gpiochip_get_data(gc);
137	unsigned char register_value;
138	int ret;
139
140	/* Format: Function - 2 bits Type - 1 bit Mode - 1 bit */
141	register_value = DA9052_OUTPUT_PUSHPULL | DA9052_SUPPLY_VDD_IO1 << 2 |
142			 value << 3;
143
144	if (da9052_gpio_port_odd(offset))
145		ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
146					DA9052_GPIO_0_1_REG,
147					DA9052_GPIO_MASK_UPPER_NIBBLE,
148					(register_value <<
149					DA9052_GPIO_NIBBLE_SHIFT));
150	else
151		ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
152					DA9052_GPIO_0_1_REG,
153					DA9052_GPIO_MASK_LOWER_NIBBLE,
154					register_value);
155
156	return ret;
157}
158
159static int da9052_gpio_to_irq(struct gpio_chip *gc, u32 offset)
160{
161	struct da9052_gpio *gpio = gpiochip_get_data(gc);
162	struct da9052 *da9052 = gpio->da9052;
163
164	int irq;
165
166	irq = regmap_irq_get_virq(da9052->irq_data, DA9052_IRQ_GPI0 + offset);
167
168	return irq;
169}
170
171static const struct gpio_chip reference_gp = {
172	.label = "da9052-gpio",
173	.owner = THIS_MODULE,
174	.get = da9052_gpio_get,
175	.set = da9052_gpio_set,
176	.direction_input = da9052_gpio_direction_input,
177	.direction_output = da9052_gpio_direction_output,
178	.to_irq = da9052_gpio_to_irq,
179	.can_sleep = true,
180	.ngpio = 16,
181	.base = -1,
182};
183
184static int da9052_gpio_probe(struct platform_device *pdev)
185{
186	struct da9052_gpio *gpio;
187	struct da9052_pdata *pdata;
188
189	gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
190	if (!gpio)
191		return -ENOMEM;
192
193	gpio->da9052 = dev_get_drvdata(pdev->dev.parent);
194	pdata = dev_get_platdata(gpio->da9052->dev);
195
196	gpio->gp = reference_gp;
197	if (pdata && pdata->gpio_base)
198		gpio->gp.base = pdata->gpio_base;
199
200	return devm_gpiochip_add_data(&pdev->dev, &gpio->gp, gpio);
201}
202
203static struct platform_driver da9052_gpio_driver = {
204	.probe = da9052_gpio_probe,
205	.driver = {
206		.name	= "da9052-gpio",
207	},
208};
209
210module_platform_driver(da9052_gpio_driver);
211
212MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
213MODULE_DESCRIPTION("DA9052 GPIO Device Driver");
214MODULE_LICENSE("GPL");
215MODULE_ALIAS("platform:da9052-gpio");