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
196module_platform_driver(adp5520_gpio_driver);
197
198MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
199MODULE_DESCRIPTION("GPIO ADP5520 Driver");
200MODULE_LICENSE("GPL");
201MODULE_ALIAS("platform:adp5520-gpio");
202