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 off,int val)43 static void adp5520_gpio_set_value(struct gpio_chip *chip,
44 unsigned off, int val)
45 {
46 struct adp5520_gpio *dev;
47 dev = gpiochip_get_data(chip);
48
49 if (val)
50 adp5520_set_bits(dev->master, ADP5520_GPIO_OUT, dev->lut[off]);
51 else
52 adp5520_clr_bits(dev->master, ADP5520_GPIO_OUT, dev->lut[off]);
53 }
54
adp5520_gpio_direction_input(struct gpio_chip * chip,unsigned off)55 static int adp5520_gpio_direction_input(struct gpio_chip *chip, unsigned off)
56 {
57 struct adp5520_gpio *dev;
58 dev = gpiochip_get_data(chip);
59
60 clear_bit(off, &dev->output);
61
62 return adp5520_clr_bits(dev->master, ADP5520_GPIO_CFG_2,
63 dev->lut[off]);
64 }
65
adp5520_gpio_direction_output(struct gpio_chip * chip,unsigned off,int val)66 static int adp5520_gpio_direction_output(struct gpio_chip *chip,
67 unsigned off, int val)
68 {
69 struct adp5520_gpio *dev;
70 int ret = 0;
71 dev = gpiochip_get_data(chip);
72
73 set_bit(off, &dev->output);
74
75 if (val)
76 ret |= adp5520_set_bits(dev->master, ADP5520_GPIO_OUT,
77 dev->lut[off]);
78 else
79 ret |= adp5520_clr_bits(dev->master, ADP5520_GPIO_OUT,
80 dev->lut[off]);
81
82 ret |= adp5520_set_bits(dev->master, ADP5520_GPIO_CFG_2,
83 dev->lut[off]);
84
85 return ret;
86 }
87
adp5520_gpio_probe(struct platform_device * pdev)88 static int adp5520_gpio_probe(struct platform_device *pdev)
89 {
90 struct adp5520_gpio_platform_data *pdata = dev_get_platdata(&pdev->dev);
91 struct adp5520_gpio *dev;
92 struct gpio_chip *gc;
93 int ret, i, gpios;
94 unsigned char ctl_mask = 0;
95
96 if (pdata == NULL) {
97 dev_err(&pdev->dev, "missing platform data\n");
98 return -ENODEV;
99 }
100
101 if (pdev->id != ID_ADP5520) {
102 dev_err(&pdev->dev, "only ADP5520 supports GPIO\n");
103 return -ENODEV;
104 }
105
106 dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
107 if (dev == NULL)
108 return -ENOMEM;
109
110 dev->master = pdev->dev.parent;
111
112 for (gpios = 0, i = 0; i < ADP5520_MAXGPIOS; i++)
113 if (pdata->gpio_en_mask & (1 << i))
114 dev->lut[gpios++] = 1 << i;
115
116 if (gpios < 1)
117 return -EINVAL;
118
119 gc = &dev->gpio_chip;
120 gc->direction_input = adp5520_gpio_direction_input;
121 gc->direction_output = adp5520_gpio_direction_output;
122 gc->get = adp5520_gpio_get_value;
123 gc->set = adp5520_gpio_set_value;
124 gc->can_sleep = true;
125
126 gc->base = pdata->gpio_start;
127 gc->ngpio = gpios;
128 gc->label = pdev->name;
129 gc->owner = THIS_MODULE;
130
131 ret = adp5520_clr_bits(dev->master, ADP5520_GPIO_CFG_1,
132 pdata->gpio_en_mask);
133
134 if (pdata->gpio_en_mask & ADP5520_GPIO_C3)
135 ctl_mask |= ADP5520_C3_MODE;
136
137 if (pdata->gpio_en_mask & ADP5520_GPIO_R3)
138 ctl_mask |= ADP5520_R3_MODE;
139
140 if (ctl_mask)
141 ret = adp5520_set_bits(dev->master, ADP5520_LED_CONTROL,
142 ctl_mask);
143
144 ret |= adp5520_set_bits(dev->master, ADP5520_GPIO_PULLUP,
145 pdata->gpio_pullup_mask);
146
147 if (ret) {
148 dev_err(&pdev->dev, "failed to write\n");
149 return ret;
150 }
151
152 return devm_gpiochip_add_data(&pdev->dev, &dev->gpio_chip, dev);
153 }
154
155 static struct platform_driver adp5520_gpio_driver = {
156 .driver = {
157 .name = "adp5520-gpio",
158 },
159 .probe = adp5520_gpio_probe,
160 };
161
162 module_platform_driver(adp5520_gpio_driver);
163
164 MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
165 MODULE_DESCRIPTION("GPIO ADP5520 Driver");
166 MODULE_LICENSE("GPL");
167 MODULE_ALIAS("platform:adp5520-gpio");
168