Root/drivers/gpio/gpio-adp5520.c

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

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