1/*
2 * GPIO Driver for Dialog DA9052 PMICs.
3 *
4 * Copyright(c) 2011 Dialog Semiconductor Ltd.
5 *
6 * Author: David Dajun Chen <dchen@diasemi.com>
7 *
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.
12 *
13 */
14#include <linux/module.h>
15#include <linux/fs.h>
16#include <linux/uaccess.h>
17#include <linux/platform_device.h>
18#include <linux/gpio.h>
19#include <linux/syscalls.h>
20#include <linux/seq_file.h>
21
22#include <linux/mfd/da9052/da9052.h>
23#include <linux/mfd/da9052/reg.h>
24#include <linux/mfd/da9052/pdata.h>
25
26#define DA9052_INPUT				1
27#define DA9052_OUTPUT_OPENDRAIN		2
28#define DA9052_OUTPUT_PUSHPULL			3
29
30#define DA9052_SUPPLY_VDD_IO1			0
31
32#define DA9052_DEBOUNCING_OFF			0
33#define DA9052_DEBOUNCING_ON			1
34
35#define DA9052_OUTPUT_LOWLEVEL			0
36
37#define DA9052_ACTIVE_LOW			0
38#define DA9052_ACTIVE_HIGH			1
39
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
48
49struct da9052_gpio {
50	struct da9052 *da9052;
51	struct gpio_chip gp;
52};
53
54static inline struct da9052_gpio *to_da9052_gpio(struct gpio_chip *chip)
55{
56	return container_of(chip, struct da9052_gpio, gp);
57}
58
59static unsigned char da9052_gpio_port_odd(unsigned offset)
60{
61	return offset % 2;
62}
63
64static int da9052_gpio_get(struct gpio_chip *gc, unsigned offset)
65{
66	struct da9052_gpio *gpio = to_da9052_gpio(gc);
67	int da9052_port_direction = 0;
68	int ret;
69
70	ret = da9052_reg_read(gpio->da9052,
71			      DA9052_GPIO_0_1_REG + (offset >> 1));
72	if (ret < 0)
73		return ret;
74
75	if (da9052_gpio_port_odd(offset)) {
76		da9052_port_direction = ret & DA9052_GPIO_ODD_PORT_PIN;
77		da9052_port_direction >>= 4;
78	} else {
79		da9052_port_direction = ret & DA9052_GPIO_EVEN_PORT_PIN;
80	}
81
82	switch (da9052_port_direction) {
83	case DA9052_INPUT:
84		if (offset < DA9052_GPIO_MAX_PORTS_PER_REGISTER)
85			ret = da9052_reg_read(gpio->da9052,
86					      DA9052_STATUS_C_REG);
87		else
88			ret = da9052_reg_read(gpio->da9052,
89					      DA9052_STATUS_D_REG);
90		if (ret < 0)
91			return ret;
92		if (ret & (1 << DA9052_GPIO_SHIFT_COUNT(offset)))
93			return 1;
94		else
95			return 0;
96	case DA9052_OUTPUT_PUSHPULL:
97		if (da9052_gpio_port_odd(offset))
98			return ret & DA9052_GPIO_ODD_PORT_MODE;
99		else
100			return ret & DA9052_GPIO_EVEN_PORT_MODE;
101	default:
102		return -EINVAL;
103	}
104}
105
106static void da9052_gpio_set(struct gpio_chip *gc, unsigned offset, int value)
107{
108	struct da9052_gpio *gpio = to_da9052_gpio(gc);
109	int ret;
110
111	if (da9052_gpio_port_odd(offset)) {
112			ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
113						DA9052_GPIO_0_1_REG,
114						DA9052_GPIO_ODD_PORT_MODE,
115						value << DA9052_GPIO_ODD_SHIFT);
116			if (ret != 0)
117				dev_err(gpio->da9052->dev,
118					"Failed to updated gpio odd reg,%d",
119					ret);
120	} else {
121			ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
122						DA9052_GPIO_0_1_REG,
123						DA9052_GPIO_EVEN_PORT_MODE,
124						value << DA9052_GPIO_EVEN_SHIFT);
125			if (ret != 0)
126				dev_err(gpio->da9052->dev,
127					"Failed to updated gpio even reg,%d",
128					ret);
129	}
130}
131
132static int da9052_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
133{
134	struct da9052_gpio *gpio = to_da9052_gpio(gc);
135	unsigned char register_value;
136	int ret;
137
138	/* Format: function - 2 bits type - 1 bit mode - 1 bit */
139	register_value = DA9052_INPUT | DA9052_ACTIVE_LOW << 2 |
140			 DA9052_DEBOUNCING_ON << 3;
141
142	if (da9052_gpio_port_odd(offset))
143		ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
144					DA9052_GPIO_0_1_REG,
145					DA9052_GPIO_MASK_UPPER_NIBBLE,
146					(register_value <<
147					DA9052_GPIO_NIBBLE_SHIFT));
148	else
149		ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
150					DA9052_GPIO_0_1_REG,
151					DA9052_GPIO_MASK_LOWER_NIBBLE,
152					register_value);
153
154	return ret;
155}
156
157static int da9052_gpio_direction_output(struct gpio_chip *gc,
158					unsigned offset, int value)
159{
160	struct da9052_gpio *gpio = to_da9052_gpio(gc);
161	unsigned char register_value;
162	int ret;
163
164	/* Format: Function - 2 bits Type - 1 bit Mode - 1 bit */
165	register_value = DA9052_OUTPUT_PUSHPULL | DA9052_SUPPLY_VDD_IO1 << 2 |
166			 value << 3;
167
168	if (da9052_gpio_port_odd(offset))
169		ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
170					DA9052_GPIO_0_1_REG,
171					DA9052_GPIO_MASK_UPPER_NIBBLE,
172					(register_value <<
173					DA9052_GPIO_NIBBLE_SHIFT));
174	else
175		ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
176					DA9052_GPIO_0_1_REG,
177					DA9052_GPIO_MASK_LOWER_NIBBLE,
178					register_value);
179
180	return ret;
181}
182
183static int da9052_gpio_to_irq(struct gpio_chip *gc, u32 offset)
184{
185	struct da9052_gpio *gpio = to_da9052_gpio(gc);
186	struct da9052 *da9052 = gpio->da9052;
187
188	int irq;
189
190	irq = regmap_irq_get_virq(da9052->irq_data, DA9052_IRQ_GPI0 + offset);
191
192	return irq;
193}
194
195static struct gpio_chip reference_gp = {
196	.label = "da9052-gpio",
197	.owner = THIS_MODULE,
198	.get = da9052_gpio_get,
199	.set = da9052_gpio_set,
200	.direction_input = da9052_gpio_direction_input,
201	.direction_output = da9052_gpio_direction_output,
202	.to_irq = da9052_gpio_to_irq,
203	.can_sleep = true,
204	.ngpio = 16,
205	.base = -1,
206};
207
208static int da9052_gpio_probe(struct platform_device *pdev)
209{
210	struct da9052_gpio *gpio;
211	struct da9052_pdata *pdata;
212	int ret;
213
214	gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
215	if (!gpio)
216		return -ENOMEM;
217
218	gpio->da9052 = dev_get_drvdata(pdev->dev.parent);
219	pdata = dev_get_platdata(gpio->da9052->dev);
220
221	gpio->gp = reference_gp;
222	if (pdata && pdata->gpio_base)
223		gpio->gp.base = pdata->gpio_base;
224
225	ret = gpiochip_add(&gpio->gp);
226	if (ret < 0) {
227		dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
228		return ret;
229	}
230
231	platform_set_drvdata(pdev, gpio);
232
233	return 0;
234}
235
236static int da9052_gpio_remove(struct platform_device *pdev)
237{
238	struct da9052_gpio *gpio = platform_get_drvdata(pdev);
239
240	gpiochip_remove(&gpio->gp);
241	return 0;
242}
243
244static struct platform_driver da9052_gpio_driver = {
245	.probe = da9052_gpio_probe,
246	.remove = da9052_gpio_remove,
247	.driver = {
248		.name	= "da9052-gpio",
249	},
250};
251
252module_platform_driver(da9052_gpio_driver);
253
254MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
255MODULE_DESCRIPTION("DA9052 GPIO Device Driver");
256MODULE_LICENSE("GPL");
257MODULE_ALIAS("platform:da9052-gpio");
258