Merge tag 'ntfs3_for_6.6' of https://github.com/Paragon-Software-Group/linux-ntfs3
[platform/kernel/linux-rpi.git] / drivers / gpio / 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
43 struct da9052_gpio {
44         struct da9052 *da9052;
45         struct gpio_chip gp;
46 };
47
48 static unsigned char da9052_gpio_port_odd(unsigned offset)
49 {
50         return offset % 2;
51 }
52
53 static 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
92 static void da9052_gpio_set(struct gpio_chip *gc, unsigned offset, int value)
93 {
94         struct da9052_gpio *gpio = gpiochip_get_data(gc);
95         int ret;
96
97         if (da9052_gpio_port_odd(offset)) {
98                         ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
99                                                 DA9052_GPIO_0_1_REG,
100                                                 DA9052_GPIO_ODD_PORT_MODE,
101                                                 value << DA9052_GPIO_ODD_SHIFT);
102                         if (ret != 0)
103                                 dev_err(gpio->da9052->dev,
104                                         "Failed to updated gpio odd reg,%d",
105                                         ret);
106         } else {
107                         ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
108                                                 DA9052_GPIO_0_1_REG,
109                                                 DA9052_GPIO_EVEN_PORT_MODE,
110                                                 value << DA9052_GPIO_EVEN_SHIFT);
111                         if (ret != 0)
112                                 dev_err(gpio->da9052->dev,
113                                         "Failed to updated gpio even reg,%d",
114                                         ret);
115         }
116 }
117
118 static int da9052_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
119 {
120         struct da9052_gpio *gpio = gpiochip_get_data(gc);
121         unsigned char register_value;
122         int ret;
123
124         /* Format: function - 2 bits type - 1 bit mode - 1 bit */
125         register_value = DA9052_INPUT | DA9052_ACTIVE_LOW << 2 |
126                          DA9052_DEBOUNCING_ON << 3;
127
128         if (da9052_gpio_port_odd(offset))
129                 ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
130                                         DA9052_GPIO_0_1_REG,
131                                         DA9052_GPIO_MASK_UPPER_NIBBLE,
132                                         (register_value <<
133                                         DA9052_GPIO_NIBBLE_SHIFT));
134         else
135                 ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
136                                         DA9052_GPIO_0_1_REG,
137                                         DA9052_GPIO_MASK_LOWER_NIBBLE,
138                                         register_value);
139
140         return ret;
141 }
142
143 static int da9052_gpio_direction_output(struct gpio_chip *gc,
144                                         unsigned offset, int value)
145 {
146         struct da9052_gpio *gpio = gpiochip_get_data(gc);
147         unsigned char register_value;
148         int ret;
149
150         /* Format: Function - 2 bits Type - 1 bit Mode - 1 bit */
151         register_value = DA9052_OUTPUT_PUSHPULL | DA9052_SUPPLY_VDD_IO1 << 2 |
152                          value << 3;
153
154         if (da9052_gpio_port_odd(offset))
155                 ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
156                                         DA9052_GPIO_0_1_REG,
157                                         DA9052_GPIO_MASK_UPPER_NIBBLE,
158                                         (register_value <<
159                                         DA9052_GPIO_NIBBLE_SHIFT));
160         else
161                 ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
162                                         DA9052_GPIO_0_1_REG,
163                                         DA9052_GPIO_MASK_LOWER_NIBBLE,
164                                         register_value);
165
166         return ret;
167 }
168
169 static int da9052_gpio_to_irq(struct gpio_chip *gc, u32 offset)
170 {
171         struct da9052_gpio *gpio = gpiochip_get_data(gc);
172         struct da9052 *da9052 = gpio->da9052;
173
174         int irq;
175
176         irq = regmap_irq_get_virq(da9052->irq_data, DA9052_IRQ_GPI0 + offset);
177
178         return irq;
179 }
180
181 static const struct gpio_chip reference_gp = {
182         .label = "da9052-gpio",
183         .owner = THIS_MODULE,
184         .get = da9052_gpio_get,
185         .set = da9052_gpio_set,
186         .direction_input = da9052_gpio_direction_input,
187         .direction_output = da9052_gpio_direction_output,
188         .to_irq = da9052_gpio_to_irq,
189         .can_sleep = true,
190         .ngpio = 16,
191         .base = -1,
192 };
193
194 static int da9052_gpio_probe(struct platform_device *pdev)
195 {
196         struct da9052_gpio *gpio;
197         struct da9052_pdata *pdata;
198
199         gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
200         if (!gpio)
201                 return -ENOMEM;
202
203         gpio->da9052 = dev_get_drvdata(pdev->dev.parent);
204         pdata = dev_get_platdata(gpio->da9052->dev);
205
206         gpio->gp = reference_gp;
207         if (pdata && pdata->gpio_base)
208                 gpio->gp.base = pdata->gpio_base;
209
210         return devm_gpiochip_add_data(&pdev->dev, &gpio->gp, gpio);
211 }
212
213 static struct platform_driver da9052_gpio_driver = {
214         .probe = da9052_gpio_probe,
215         .driver = {
216                 .name   = "da9052-gpio",
217         },
218 };
219
220 module_platform_driver(da9052_gpio_driver);
221
222 MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
223 MODULE_DESCRIPTION("DA9052 GPIO Device Driver");
224 MODULE_LICENSE("GPL");
225 MODULE_ALIAS("platform:da9052-gpio");