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path: root/drivers/gpio/gpio-adp5520.c
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Diffstat (limited to 'drivers/gpio/gpio-adp5520.c')
-rw-r--r--drivers/gpio/gpio-adp5520.c211
1 files changed, 211 insertions, 0 deletions
diff --git a/drivers/gpio/gpio-adp5520.c b/drivers/gpio/gpio-adp5520.c
new file mode 100644
index 000000000000..9f2781537001
--- /dev/null
+++ b/drivers/gpio/gpio-adp5520.c
@@ -0,0 +1,211 @@
1/*
2 * GPIO driver for Analog Devices ADP5520 MFD PMICs
3 *
4 * Copyright 2009 Analog Devices Inc.
5 *
6 * Licensed under the GPL-2 or later.
7 */
8
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 * There are dedicated registers for GPIO IN/OUT.
34 * Make sure we return the right value, even when configured as output
35 */
36
37 if (test_bit(off, &dev->output))
38 adp5520_read(dev->master, ADP5520_GPIO_OUT, &reg_val);
39 else
40 adp5520_read(dev->master, ADP5520_GPIO_IN, &reg_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 __devinit adp5520_gpio_probe(struct platform_device *pdev)
91{
92 struct adp5520_gpio_platform_data *pdata = pdev->dev.platform_data;
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 = kzalloc(sizeof(*dev), GFP_KERNEL);
109 if (dev == NULL) {
110 dev_err(&pdev->dev, "failed to alloc memory\n");
111 return -ENOMEM;
112 }
113
114 dev->master = pdev->dev.parent;
115
116 for (gpios = 0, i = 0; i < ADP5520_MAXGPIOS; i++)
117 if (pdata->gpio_en_mask & (1 << i))
118 dev->lut[gpios++] = 1 << i;
119
120 if (gpios < 1) {
121 ret = -EINVAL;
122 goto err;
123 }
124
125 gc = &dev->gpio_chip;
126 gc->direction_input = adp5520_gpio_direction_input;
127 gc->direction_output = adp5520_gpio_direction_output;
128 gc->get = adp5520_gpio_get_value;
129 gc->set = adp5520_gpio_set_value;
130 gc->can_sleep = 1;
131
132 gc->base = pdata->gpio_start;
133 gc->ngpio = gpios;
134 gc->label = pdev->name;
135 gc->owner = THIS_MODULE;
136
137 ret = adp5520_clr_bits(dev->master, ADP5520_GPIO_CFG_1,
138 pdata->gpio_en_mask);
139
140 if (pdata->gpio_en_mask & ADP5520_GPIO_C3)
141 ctl_mask |= ADP5520_C3_MODE;
142
143 if (pdata->gpio_en_mask & ADP5520_GPIO_R3)
144 ctl_mask |= ADP5520_R3_MODE;
145
146 if (ctl_mask)
147 ret = adp5520_set_bits(dev->master, ADP5520_LED_CONTROL,
148 ctl_mask);
149
150 ret |= adp5520_set_bits(dev->master, ADP5520_GPIO_PULLUP,
151 pdata->gpio_pullup_mask);
152
153 if (ret) {
154 dev_err(&pdev->dev, "failed to write\n");
155 goto err;
156 }
157
158 ret = gpiochip_add(&dev->gpio_chip);
159 if (ret)
160 goto err;
161
162 platform_set_drvdata(pdev, dev);
163 return 0;
164
165err:
166 kfree(dev);
167 return ret;
168}
169
170static int __devexit adp5520_gpio_remove(struct platform_device *pdev)
171{
172 struct adp5520_gpio *dev;
173 int ret;
174
175 dev = platform_get_drvdata(pdev);
176 ret = gpiochip_remove(&dev->gpio_chip);
177 if (ret) {
178 dev_err(&pdev->dev, "%s failed, %d\n",
179 "gpiochip_remove()", ret);
180 return ret;
181 }
182
183 kfree(dev);
184 return 0;
185}
186
187static struct platform_driver adp5520_gpio_driver = {
188 .driver = {
189 .name = "adp5520-gpio",
190 .owner = THIS_MODULE,
191 },
192 .probe = adp5520_gpio_probe,
193 .remove = __devexit_p(adp5520_gpio_remove),
194};
195
196static int __init adp5520_gpio_init(void)
197{
198 return platform_driver_register(&adp5520_gpio_driver);
199}
200module_init(adp5520_gpio_init);
201
202static void __exit adp5520_gpio_exit(void)
203{
204 platform_driver_unregister(&adp5520_gpio_driver);
205}
206module_exit(adp5520_gpio_exit);
207
208MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
209MODULE_DESCRIPTION("GPIO ADP5520 Driver");
210MODULE_LICENSE("GPL");
211MODULE_ALIAS("platform:adp5520-gpio");