1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * GPIO driver for Analog Devices ADP5520 MFD PMICs
4 *
5 * Copyright 2009 Analog Devices Inc.
6 */
7
8 #include <linux/module.h>
9 #include <linux/slab.h>
10 #include <linux/kernel.h>
11 #include <linux/init.h>
12 #include <linux/platform_device.h>
13 #include <linux/mfd/adp5520.h>
14 #include <linux/gpio/driver.h>
15
16 struct adp5520_gpio {
17 struct device *master;
18 struct gpio_chip gpio_chip;
19 unsigned char lut[ADP5520_MAXGPIOS];
20 unsigned long output;
21 };
22
adp5520_gpio_get_value(struct gpio_chip * chip,unsigned off)23 static int adp5520_gpio_get_value(struct gpio_chip *chip, unsigned off)
24 {
25 struct adp5520_gpio *dev;
26 uint8_t reg_val;
27
28 dev = gpiochip_get_data(chip);
29
30 /*
31 * There are dedicated registers for GPIO IN/OUT.
32 * Make sure we return the right value, even when configured as output
33 */
34
35 if (test_bit(off, &dev->output))
36 adp5520_read(dev->master, ADP5520_GPIO_OUT, ®_val);
37 else
38 adp5520_read(dev->master, ADP5520_GPIO_IN, ®_val);
39
40 return !!(reg_val & dev->lut[off]);
41 }
42
adp5520_gpio_set_value(struct gpio_chip * chip,unsigned int off,int val)43 static int adp5520_gpio_set_value(struct gpio_chip *chip,
44 unsigned int off, int val)
45 {
46 struct adp5520_gpio *dev;
47 dev = gpiochip_get_data(chip);
48
49 if (val)
50 return adp5520_set_bits(dev->master, ADP5520_GPIO_OUT,
51 dev->lut[off]);
52 else
53 return adp5520_clr_bits(dev->master, ADP5520_GPIO_OUT,
54 dev->lut[off]);
55 }
56
adp5520_gpio_direction_input(struct gpio_chip * chip,unsigned off)57 static int adp5520_gpio_direction_input(struct gpio_chip *chip, unsigned off)
58 {
59 struct adp5520_gpio *dev;
60 dev = gpiochip_get_data(chip);
61
62 clear_bit(off, &dev->output);
63
64 return adp5520_clr_bits(dev->master, ADP5520_GPIO_CFG_2,
65 dev->lut[off]);
66 }
67
adp5520_gpio_direction_output(struct gpio_chip * chip,unsigned off,int val)68 static int adp5520_gpio_direction_output(struct gpio_chip *chip,
69 unsigned off, int val)
70 {
71 struct adp5520_gpio *dev;
72 int ret = 0;
73 dev = gpiochip_get_data(chip);
74
75 set_bit(off, &dev->output);
76
77 if (val)
78 ret |= adp5520_set_bits(dev->master, ADP5520_GPIO_OUT,
79 dev->lut[off]);
80 else
81 ret |= adp5520_clr_bits(dev->master, ADP5520_GPIO_OUT,
82 dev->lut[off]);
83
84 ret |= adp5520_set_bits(dev->master, ADP5520_GPIO_CFG_2,
85 dev->lut[off]);
86
87 return ret;
88 }
89
adp5520_gpio_probe(struct platform_device * pdev)90 static int adp5520_gpio_probe(struct platform_device *pdev)
91 {
92 struct adp5520_gpio_platform_data *pdata = dev_get_platdata(&pdev->dev);
93 struct adp5520_gpio *dev;
94 struct gpio_chip *gc;
95 int ret, i, gpios;
96 unsigned char ctl_mask = 0;
97
98 if (pdata == NULL) {
99 dev_err(&pdev->dev, "missing platform data\n");
100 return -ENODEV;
101 }
102
103 if (pdev->id != ID_ADP5520) {
104 dev_err(&pdev->dev, "only ADP5520 supports GPIO\n");
105 return -ENODEV;
106 }
107
108 dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
109 if (dev == NULL)
110 return -ENOMEM;
111
112 dev->master = pdev->dev.parent;
113
114 for (gpios = 0, i = 0; i < ADP5520_MAXGPIOS; i++)
115 if (pdata->gpio_en_mask & (1 << i))
116 dev->lut[gpios++] = 1 << i;
117
118 if (gpios < 1)
119 return -EINVAL;
120
121 gc = &dev->gpio_chip;
122 gc->direction_input = adp5520_gpio_direction_input;
123 gc->direction_output = adp5520_gpio_direction_output;
124 gc->get = adp5520_gpio_get_value;
125 gc->set_rv = adp5520_gpio_set_value;
126 gc->can_sleep = true;
127
128 gc->base = pdata->gpio_start;
129 gc->ngpio = gpios;
130 gc->label = pdev->name;
131 gc->owner = THIS_MODULE;
132
133 ret = adp5520_clr_bits(dev->master, ADP5520_GPIO_CFG_1,
134 pdata->gpio_en_mask);
135
136 if (pdata->gpio_en_mask & ADP5520_GPIO_C3)
137 ctl_mask |= ADP5520_C3_MODE;
138
139 if (pdata->gpio_en_mask & ADP5520_GPIO_R3)
140 ctl_mask |= ADP5520_R3_MODE;
141
142 if (ctl_mask)
143 ret = adp5520_set_bits(dev->master, ADP5520_LED_CONTROL,
144 ctl_mask);
145
146 ret |= adp5520_set_bits(dev->master, ADP5520_GPIO_PULLUP,
147 pdata->gpio_pullup_mask);
148
149 if (ret) {
150 dev_err(&pdev->dev, "failed to write\n");
151 return ret;
152 }
153
154 return devm_gpiochip_add_data(&pdev->dev, &dev->gpio_chip, dev);
155 }
156
157 static struct platform_driver adp5520_gpio_driver = {
158 .driver = {
159 .name = "adp5520-gpio",
160 },
161 .probe = adp5520_gpio_probe,
162 };
163
164 module_platform_driver(adp5520_gpio_driver);
165
166 MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
167 MODULE_DESCRIPTION("GPIO ADP5520 Driver");
168 MODULE_LICENSE("GPL");
169 MODULE_ALIAS("platform:adp5520-gpio");
170