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/driver.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 
49 struct da9052_gpio {
50 	struct da9052 *da9052;
51 	struct gpio_chip gp;
52 };
53 
da9052_gpio_port_odd(unsigned offset)54 static unsigned char da9052_gpio_port_odd(unsigned offset)
55 {
56 	return offset % 2;
57 }
58 
da9052_gpio_get(struct gpio_chip * gc,unsigned offset)59 static int da9052_gpio_get(struct gpio_chip *gc, unsigned offset)
60 {
61 	struct da9052_gpio *gpio = gpiochip_get_data(gc);
62 	int da9052_port_direction = 0;
63 	int ret;
64 
65 	ret = da9052_reg_read(gpio->da9052,
66 			      DA9052_GPIO_0_1_REG + (offset >> 1));
67 	if (ret < 0)
68 		return ret;
69 
70 	if (da9052_gpio_port_odd(offset)) {
71 		da9052_port_direction = ret & DA9052_GPIO_ODD_PORT_PIN;
72 		da9052_port_direction >>= 4;
73 	} else {
74 		da9052_port_direction = ret & DA9052_GPIO_EVEN_PORT_PIN;
75 	}
76 
77 	switch (da9052_port_direction) {
78 	case DA9052_INPUT:
79 		if (offset < DA9052_GPIO_MAX_PORTS_PER_REGISTER)
80 			ret = da9052_reg_read(gpio->da9052,
81 					      DA9052_STATUS_C_REG);
82 		else
83 			ret = da9052_reg_read(gpio->da9052,
84 					      DA9052_STATUS_D_REG);
85 		if (ret < 0)
86 			return ret;
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);
91 		else
92 			return !!(ret & DA9052_GPIO_EVEN_PORT_MODE);
93 	default:
94 		return -EINVAL;
95 	}
96 }
97 
da9052_gpio_set(struct gpio_chip * gc,unsigned offset,int value)98 static void da9052_gpio_set(struct gpio_chip *gc, unsigned offset, int value)
99 {
100 	struct da9052_gpio *gpio = gpiochip_get_data(gc);
101 	int ret;
102 
103 	if (da9052_gpio_port_odd(offset)) {
104 			ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
105 						DA9052_GPIO_0_1_REG,
106 						DA9052_GPIO_ODD_PORT_MODE,
107 						value << DA9052_GPIO_ODD_SHIFT);
108 			if (ret != 0)
109 				dev_err(gpio->da9052->dev,
110 					"Failed to updated gpio odd reg,%d",
111 					ret);
112 	} else {
113 			ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
114 						DA9052_GPIO_0_1_REG,
115 						DA9052_GPIO_EVEN_PORT_MODE,
116 						value << DA9052_GPIO_EVEN_SHIFT);
117 			if (ret != 0)
118 				dev_err(gpio->da9052->dev,
119 					"Failed to updated gpio even reg,%d",
120 					ret);
121 	}
122 }
123 
da9052_gpio_direction_input(struct gpio_chip * gc,unsigned offset)124 static int da9052_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
125 {
126 	struct da9052_gpio *gpio = gpiochip_get_data(gc);
127 	unsigned char register_value;
128 	int ret;
129 
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;
133 
134 	if (da9052_gpio_port_odd(offset))
135 		ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
136 					DA9052_GPIO_0_1_REG,
137 					DA9052_GPIO_MASK_UPPER_NIBBLE,
138 					(register_value <<
139 					DA9052_GPIO_NIBBLE_SHIFT));
140 	else
141 		ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
142 					DA9052_GPIO_0_1_REG,
143 					DA9052_GPIO_MASK_LOWER_NIBBLE,
144 					register_value);
145 
146 	return ret;
147 }
148 
da9052_gpio_direction_output(struct gpio_chip * gc,unsigned offset,int value)149 static int da9052_gpio_direction_output(struct gpio_chip *gc,
150 					unsigned offset, int value)
151 {
152 	struct da9052_gpio *gpio = gpiochip_get_data(gc);
153 	unsigned char register_value;
154 	int ret;
155 
156 	/* Format: Function - 2 bits Type - 1 bit Mode - 1 bit */
157 	register_value = DA9052_OUTPUT_PUSHPULL | DA9052_SUPPLY_VDD_IO1 << 2 |
158 			 value << 3;
159 
160 	if (da9052_gpio_port_odd(offset))
161 		ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
162 					DA9052_GPIO_0_1_REG,
163 					DA9052_GPIO_MASK_UPPER_NIBBLE,
164 					(register_value <<
165 					DA9052_GPIO_NIBBLE_SHIFT));
166 	else
167 		ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
168 					DA9052_GPIO_0_1_REG,
169 					DA9052_GPIO_MASK_LOWER_NIBBLE,
170 					register_value);
171 
172 	return ret;
173 }
174 
da9052_gpio_to_irq(struct gpio_chip * gc,u32 offset)175 static int da9052_gpio_to_irq(struct gpio_chip *gc, u32 offset)
176 {
177 	struct da9052_gpio *gpio = gpiochip_get_data(gc);
178 	struct da9052 *da9052 = gpio->da9052;
179 
180 	int irq;
181 
182 	irq = regmap_irq_get_virq(da9052->irq_data, DA9052_IRQ_GPI0 + offset);
183 
184 	return irq;
185 }
186 
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,
195 	.can_sleep = true,
196 	.ngpio = 16,
197 	.base = -1,
198 };
199 
da9052_gpio_probe(struct platform_device * pdev)200 static int da9052_gpio_probe(struct platform_device *pdev)
201 {
202 	struct da9052_gpio *gpio;
203 	struct da9052_pdata *pdata;
204 	int ret;
205 
206 	gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
207 	if (!gpio)
208 		return -ENOMEM;
209 
210 	gpio->da9052 = dev_get_drvdata(pdev->dev.parent);
211 	pdata = dev_get_platdata(gpio->da9052->dev);
212 
213 	gpio->gp = reference_gp;
214 	if (pdata && pdata->gpio_base)
215 		gpio->gp.base = pdata->gpio_base;
216 
217 	ret = devm_gpiochip_add_data(&pdev->dev, &gpio->gp, gpio);
218 	if (ret < 0) {
219 		dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
220 		return ret;
221 	}
222 
223 	platform_set_drvdata(pdev, gpio);
224 
225 	return 0;
226 }
227 
228 static struct platform_driver da9052_gpio_driver = {
229 	.probe = da9052_gpio_probe,
230 	.driver = {
231 		.name	= "da9052-gpio",
232 	},
233 };
234 
235 module_platform_driver(da9052_gpio_driver);
236 
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");
241