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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
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2 | /* |
3 | * GPIO Driver for Dialog DA9055 PMICs. | |
4 | * | |
5 | * Copyright(c) 2012 Dialog Semiconductor Ltd. | |
6 | * | |
7 | * Author: David Dajun Chen <dchen@diasemi.com> | |
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8 | */ |
9 | #include <linux/module.h> | |
10 | #include <linux/platform_device.h> | |
45e8bd9c | 11 | #include <linux/gpio/driver.h> |
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12 | |
13 | #include <linux/mfd/da9055/core.h> | |
14 | #include <linux/mfd/da9055/reg.h> | |
15 | #include <linux/mfd/da9055/pdata.h> | |
16 | ||
17 | #define DA9055_VDD_IO 0x0 | |
18 | #define DA9055_PUSH_PULL 0x3 | |
19 | #define DA9055_ACT_LOW 0x0 | |
20 | #define DA9055_GPI 0x1 | |
21 | #define DA9055_PORT_MASK 0x3 | |
22 | #define DA9055_PORT_SHIFT(offset) (4 * (offset % 2)) | |
23 | ||
24 | #define DA9055_INPUT DA9055_GPI | |
25 | #define DA9055_OUTPUT DA9055_PUSH_PULL | |
26 | #define DA9055_IRQ_GPI0 3 | |
27 | ||
28 | struct da9055_gpio { | |
29 | struct da9055 *da9055; | |
30 | struct gpio_chip gp; | |
31 | }; | |
32 | ||
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33 | static int da9055_gpio_get(struct gpio_chip *gc, unsigned offset) |
34 | { | |
552dd795 | 35 | struct da9055_gpio *gpio = gpiochip_get_data(gc); |
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36 | int gpio_direction = 0; |
37 | int ret; | |
38 | ||
39 | /* Get GPIO direction */ | |
40 | ret = da9055_reg_read(gpio->da9055, (offset >> 1) + DA9055_REG_GPIO0_1); | |
41 | if (ret < 0) | |
42 | return ret; | |
43 | ||
44 | gpio_direction = ret & (DA9055_PORT_MASK) << DA9055_PORT_SHIFT(offset); | |
45 | gpio_direction >>= DA9055_PORT_SHIFT(offset); | |
46 | switch (gpio_direction) { | |
47 | case DA9055_INPUT: | |
48 | ret = da9055_reg_read(gpio->da9055, DA9055_REG_STATUS_B); | |
49 | if (ret < 0) | |
50 | return ret; | |
51 | break; | |
52 | case DA9055_OUTPUT: | |
53 | ret = da9055_reg_read(gpio->da9055, DA9055_REG_GPIO_MODE0_2); | |
54 | if (ret < 0) | |
55 | return ret; | |
56 | } | |
57 | ||
58 | return ret & (1 << offset); | |
59 | ||
60 | } | |
61 | ||
62 | static void da9055_gpio_set(struct gpio_chip *gc, unsigned offset, int value) | |
63 | { | |
552dd795 | 64 | struct da9055_gpio *gpio = gpiochip_get_data(gc); |
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65 | |
66 | da9055_reg_update(gpio->da9055, | |
67 | DA9055_REG_GPIO_MODE0_2, | |
68 | 1 << offset, | |
69 | value << offset); | |
70 | } | |
71 | ||
72 | static int da9055_gpio_direction_input(struct gpio_chip *gc, unsigned offset) | |
73 | { | |
552dd795 | 74 | struct da9055_gpio *gpio = gpiochip_get_data(gc); |
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75 | unsigned char reg_byte; |
76 | ||
77 | reg_byte = (DA9055_ACT_LOW | DA9055_GPI) | |
78 | << DA9055_PORT_SHIFT(offset); | |
79 | ||
80 | return da9055_reg_update(gpio->da9055, (offset >> 1) + | |
81 | DA9055_REG_GPIO0_1, | |
82 | DA9055_PORT_MASK << | |
83 | DA9055_PORT_SHIFT(offset), | |
84 | reg_byte); | |
85 | } | |
86 | ||
87 | static int da9055_gpio_direction_output(struct gpio_chip *gc, | |
88 | unsigned offset, int value) | |
89 | { | |
552dd795 | 90 | struct da9055_gpio *gpio = gpiochip_get_data(gc); |
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91 | unsigned char reg_byte; |
92 | int ret; | |
93 | ||
94 | reg_byte = (DA9055_VDD_IO | DA9055_PUSH_PULL) | |
95 | << DA9055_PORT_SHIFT(offset); | |
96 | ||
97 | ret = da9055_reg_update(gpio->da9055, (offset >> 1) + | |
98 | DA9055_REG_GPIO0_1, | |
99 | DA9055_PORT_MASK << | |
100 | DA9055_PORT_SHIFT(offset), | |
101 | reg_byte); | |
102 | if (ret < 0) | |
103 | return ret; | |
104 | ||
105 | da9055_gpio_set(gc, offset, value); | |
106 | ||
107 | return 0; | |
108 | } | |
109 | ||
110 | static int da9055_gpio_to_irq(struct gpio_chip *gc, u32 offset) | |
111 | { | |
552dd795 | 112 | struct da9055_gpio *gpio = gpiochip_get_data(gc); |
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113 | struct da9055 *da9055 = gpio->da9055; |
114 | ||
115 | return regmap_irq_get_virq(da9055->irq_data, | |
116 | DA9055_IRQ_GPI0 + offset); | |
117 | } | |
118 | ||
e35b5ab0 | 119 | static const struct gpio_chip reference_gp = { |
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120 | .label = "da9055-gpio", |
121 | .owner = THIS_MODULE, | |
122 | .get = da9055_gpio_get, | |
123 | .set = da9055_gpio_set, | |
124 | .direction_input = da9055_gpio_direction_input, | |
125 | .direction_output = da9055_gpio_direction_output, | |
126 | .to_irq = da9055_gpio_to_irq, | |
9fb1f39e | 127 | .can_sleep = true, |
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128 | .ngpio = 3, |
129 | .base = -1, | |
130 | }; | |
131 | ||
0fe763c5 | 132 | static int da9055_gpio_probe(struct platform_device *pdev) |
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133 | { |
134 | struct da9055_gpio *gpio; | |
135 | struct da9055_pdata *pdata; | |
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136 | |
137 | gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL); | |
afeb7b45 | 138 | if (!gpio) |
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139 | return -ENOMEM; |
140 | ||
141 | gpio->da9055 = dev_get_drvdata(pdev->dev.parent); | |
e56aee18 | 142 | pdata = dev_get_platdata(gpio->da9055->dev); |
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143 | |
144 | gpio->gp = reference_gp; | |
145 | if (pdata && pdata->gpio_base) | |
146 | gpio->gp.base = pdata->gpio_base; | |
147 | ||
1189827a | 148 | return devm_gpiochip_add_data(&pdev->dev, &gpio->gp, gpio); |
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149 | } |
150 | ||
151 | static struct platform_driver da9055_gpio_driver = { | |
152 | .probe = da9055_gpio_probe, | |
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153 | .driver = { |
154 | .name = "da9055-gpio", | |
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155 | }, |
156 | }; | |
157 | ||
158 | static int __init da9055_gpio_init(void) | |
159 | { | |
160 | return platform_driver_register(&da9055_gpio_driver); | |
161 | } | |
162 | subsys_initcall(da9055_gpio_init); | |
163 | ||
164 | static void __exit da9055_gpio_exit(void) | |
165 | { | |
166 | platform_driver_unregister(&da9055_gpio_driver); | |
167 | } | |
168 | module_exit(da9055_gpio_exit); | |
169 | ||
170 | MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>"); | |
171 | MODULE_DESCRIPTION("DA9055 GPIO Device Driver"); | |
172 | MODULE_LICENSE("GPL"); | |
173 | MODULE_ALIAS("platform:da9055-gpio"); |