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9#include <linux/module.h>
10#include <linux/slab.h>
11#include <linux/kernel.h>
12#include <linux/init.h>
13#include <linux/platform_device.h>
14#include <linux/mfd/adp5520.h>
15
16#include <linux/gpio.h>
17
18struct adp5520_gpio {
19 struct device *master;
20 struct gpio_chip gpio_chip;
21 unsigned char lut[ADP5520_MAXGPIOS];
22 unsigned long output;
23};
24
25static int adp5520_gpio_get_value(struct gpio_chip *chip, unsigned off)
26{
27 struct adp5520_gpio *dev;
28 uint8_t reg_val;
29
30 dev = container_of(chip, struct adp5520_gpio, gpio_chip);
31
32
33
34
35
36
37 if (test_bit(off, &dev->output))
38 adp5520_read(dev->master, ADP5520_GPIO_OUT, ®_val);
39 else
40 adp5520_read(dev->master, ADP5520_GPIO_IN, ®_val);
41
42 return !!(reg_val & dev->lut[off]);
43}
44
45static void adp5520_gpio_set_value(struct gpio_chip *chip,
46 unsigned off, int val)
47{
48 struct adp5520_gpio *dev;
49 dev = container_of(chip, struct adp5520_gpio, gpio_chip);
50
51 if (val)
52 adp5520_set_bits(dev->master, ADP5520_GPIO_OUT, dev->lut[off]);
53 else
54 adp5520_clr_bits(dev->master, ADP5520_GPIO_OUT, dev->lut[off]);
55}
56
57static int adp5520_gpio_direction_input(struct gpio_chip *chip, unsigned off)
58{
59 struct adp5520_gpio *dev;
60 dev = container_of(chip, struct adp5520_gpio, gpio_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
68static 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 = container_of(chip, struct adp5520_gpio, gpio_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
90static 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 ret = -EINVAL;
120 goto err;
121 }
122
123 gc = &dev->gpio_chip;
124 gc->direction_input = adp5520_gpio_direction_input;
125 gc->direction_output = adp5520_gpio_direction_output;
126 gc->get = adp5520_gpio_get_value;
127 gc->set = adp5520_gpio_set_value;
128 gc->can_sleep = true;
129
130 gc->base = pdata->gpio_start;
131 gc->ngpio = gpios;
132 gc->label = pdev->name;
133 gc->owner = THIS_MODULE;
134
135 ret = adp5520_clr_bits(dev->master, ADP5520_GPIO_CFG_1,
136 pdata->gpio_en_mask);
137
138 if (pdata->gpio_en_mask & ADP5520_GPIO_C3)
139 ctl_mask |= ADP5520_C3_MODE;
140
141 if (pdata->gpio_en_mask & ADP5520_GPIO_R3)
142 ctl_mask |= ADP5520_R3_MODE;
143
144 if (ctl_mask)
145 ret = adp5520_set_bits(dev->master, ADP5520_LED_CONTROL,
146 ctl_mask);
147
148 ret |= adp5520_set_bits(dev->master, ADP5520_GPIO_PULLUP,
149 pdata->gpio_pullup_mask);
150
151 if (ret) {
152 dev_err(&pdev->dev, "failed to write\n");
153 goto err;
154 }
155
156 ret = gpiochip_add(&dev->gpio_chip);
157 if (ret)
158 goto err;
159
160 platform_set_drvdata(pdev, dev);
161 return 0;
162
163err:
164 return ret;
165}
166
167static int adp5520_gpio_remove(struct platform_device *pdev)
168{
169 struct adp5520_gpio *dev;
170
171 dev = platform_get_drvdata(pdev);
172 gpiochip_remove(&dev->gpio_chip);
173
174 return 0;
175}
176
177static struct platform_driver adp5520_gpio_driver = {
178 .driver = {
179 .name = "adp5520-gpio",
180 },
181 .probe = adp5520_gpio_probe,
182 .remove = adp5520_gpio_remove,
183};
184
185module_platform_driver(adp5520_gpio_driver);
186
187MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
188MODULE_DESCRIPTION("GPIO ADP5520 Driver");
189MODULE_LICENSE("GPL");
190MODULE_ALIAS("platform:adp5520-gpio");
191
