tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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/kernel.h>
11#include <linux/init.h>
12#include <linux/platform_device.h>
13#include <linux/mfd/adp5520.h>
14
15#include <linux/gpio.h>
16
17struct adp5520_gpio {
18 struct device *master;
19 struct gpio_chip gpio_chip;
20 unsigned char lut[ADP5520_MAXGPIOS];
21 unsigned long output;
22};
23
24static int adp5520_gpio_get_value(struct gpio_chip *chip, unsigned off)
25{
26 struct adp5520_gpio *dev;
27 uint8_t reg_val;
28
29 dev = container_of(chip, struct adp5520_gpio, gpio_chip);
30
31 /*
32 * There are dedicated registers for GPIO IN/OUT.
33 * Make sure we return the right value, even when configured as output
34 */
35
36 if (test_bit(off, &dev->output))
37 adp5520_read(dev->master, GPIO_OUT, ®_val);
38 else
39 adp5520_read(dev->master, GPIO_IN, ®_val);
40
41 return !!(reg_val & dev->lut[off]);
42}
43
44static void adp5520_gpio_set_value(struct gpio_chip *chip,
45 unsigned off, int val)
46{
47 struct adp5520_gpio *dev;
48 dev = container_of(chip, struct adp5520_gpio, gpio_chip);
49
50 if (val)
51 adp5520_set_bits(dev->master, GPIO_OUT, dev->lut[off]);
52 else
53 adp5520_clr_bits(dev->master, GPIO_OUT, dev->lut[off]);
54}
55
56static int adp5520_gpio_direction_input(struct gpio_chip *chip, unsigned off)
57{
58 struct adp5520_gpio *dev;
59 dev = container_of(chip, struct adp5520_gpio, gpio_chip);
60
61 clear_bit(off, &dev->output);
62
63 return adp5520_clr_bits(dev->master, GPIO_CFG_2, dev->lut[off]);
64}
65
66static 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 = container_of(chip, struct adp5520_gpio, gpio_chip);
72
73 set_bit(off, &dev->output);
74
75 if (val)
76 ret |= adp5520_set_bits(dev->master, GPIO_OUT, dev->lut[off]);
77 else
78 ret |= adp5520_clr_bits(dev->master, GPIO_OUT, dev->lut[off]);
79
80 ret |= adp5520_set_bits(dev->master, GPIO_CFG_2, dev->lut[off]);
81
82 return ret;
83}
84
85static int __devinit adp5520_gpio_probe(struct platform_device *pdev)
86{
87 struct adp5520_gpio_platfrom_data *pdata = pdev->dev.platform_data;
88 struct adp5520_gpio *dev;
89 struct gpio_chip *gc;
90 int ret, i, gpios;
91 unsigned char ctl_mask = 0;
92
93 if (pdata == NULL) {
94 dev_err(&pdev->dev, "missing platform data\n");
95 return -ENODEV;
96 }
97
98 if (pdev->id != ID_ADP5520) {
99 dev_err(&pdev->dev, "only ADP5520 supports GPIO\n");
100 return -ENODEV;
101 }
102
103 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
104 if (dev == NULL) {
105 dev_err(&pdev->dev, "failed to alloc memory\n");
106 return -ENOMEM;
107 }
108
109 dev->master = pdev->dev.parent;
110
111 for (gpios = 0, i = 0; i < ADP5520_MAXGPIOS; i++)
112 if (pdata->gpio_en_mask & (1 << i))
113 dev->lut[gpios++] = 1 << i;
114
115 if (gpios < 1) {
116 ret = -EINVAL;
117 goto err;
118 }
119
120 gc = &dev->gpio_chip;
121 gc->direction_input = adp5520_gpio_direction_input;
122 gc->direction_output = adp5520_gpio_direction_output;
123 gc->get = adp5520_gpio_get_value;
124 gc->set = adp5520_gpio_set_value;
125 gc->can_sleep = 1;
126
127 gc->base = pdata->gpio_start;
128 gc->ngpio = gpios;
129 gc->label = pdev->name;
130 gc->owner = THIS_MODULE;
131
132 ret = adp5520_clr_bits(dev->master, GPIO_CFG_1,
133 pdata->gpio_en_mask);
134
135 if (pdata->gpio_en_mask & GPIO_C3)
136 ctl_mask |= C3_MODE;
137
138 if (pdata->gpio_en_mask & GPIO_R3)
139 ctl_mask |= R3_MODE;
140
141 if (ctl_mask)
142 ret = adp5520_set_bits(dev->master, LED_CONTROL,
143 ctl_mask);
144
145 ret |= adp5520_set_bits(dev->master, GPIO_PULLUP,
146 pdata->gpio_pullup_mask);
147
148 if (ret) {
149 dev_err(&pdev->dev, "failed to write\n");
150 goto err;
151 }
152
153 ret = gpiochip_add(&dev->gpio_chip);
154 if (ret)
155 goto err;
156
157 platform_set_drvdata(pdev, dev);
158 return 0;
159
160err:
161 kfree(dev);
162 return ret;
163}
164
165static int __devexit adp5520_gpio_remove(struct platform_device *pdev)
166{
167 struct adp5520_gpio *dev;
168 int ret;
169
170 dev = platform_get_drvdata(pdev);
171 ret = gpiochip_remove(&dev->gpio_chip);
172 if (ret) {
173 dev_err(&pdev->dev, "%s failed, %d\n",
174 "gpiochip_remove()", ret);
175 return ret;
176 }
177
178 kfree(dev);
179 return 0;
180}
181
182static struct platform_driver adp5520_gpio_driver = {
183 .driver = {
184 .name = "adp5520-gpio",
185 .owner = THIS_MODULE,
186 },
187 .probe = adp5520_gpio_probe,
188 .remove = __devexit_p(adp5520_gpio_remove),
189};
190
191static int __init adp5520_gpio_init(void)
192{
193 return platform_driver_register(&adp5520_gpio_driver);
194}
195module_init(adp5520_gpio_init);
196
197static void __exit adp5520_gpio_exit(void)
198{
199 platform_driver_unregister(&adp5520_gpio_driver);
200}
201module_exit(adp5520_gpio_exit);
202
203MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
204MODULE_DESCRIPTION("GPIO ADP5520 Driver");
205MODULE_LICENSE("GPL");
206MODULE_ALIAS("platform:adp5520-gpio");