tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
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_rv = 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");