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ef72af40 MH |
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> | |
5a0e3ad6 | 10 | #include <linux/slab.h> |
ef72af40 MH |
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 | ||
18 | struct adp5520_gpio { | |
19 | struct device *master; | |
20 | struct gpio_chip gpio_chip; | |
21 | unsigned char lut[ADP5520_MAXGPIOS]; | |
22 | unsigned long output; | |
23 | }; | |
24 | ||
25 | static 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)) | |
7c29a476 | 38 | adp5520_read(dev->master, ADP5520_GPIO_OUT, ®_val); |
ef72af40 | 39 | else |
7c29a476 | 40 | adp5520_read(dev->master, ADP5520_GPIO_IN, ®_val); |
ef72af40 MH |
41 | |
42 | return !!(reg_val & dev->lut[off]); | |
43 | } | |
44 | ||
45 | static 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) | |
7c29a476 | 52 | adp5520_set_bits(dev->master, ADP5520_GPIO_OUT, dev->lut[off]); |
ef72af40 | 53 | else |
7c29a476 | 54 | adp5520_clr_bits(dev->master, ADP5520_GPIO_OUT, dev->lut[off]); |
ef72af40 MH |
55 | } |
56 | ||
57 | static 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 | ||
7c29a476 MH |
64 | return adp5520_clr_bits(dev->master, ADP5520_GPIO_CFG_2, |
65 | dev->lut[off]); | |
ef72af40 MH |
66 | } |
67 | ||
68 | static 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) | |
7c29a476 MH |
78 | ret |= adp5520_set_bits(dev->master, ADP5520_GPIO_OUT, |
79 | dev->lut[off]); | |
ef72af40 | 80 | else |
7c29a476 MH |
81 | ret |= adp5520_clr_bits(dev->master, ADP5520_GPIO_OUT, |
82 | dev->lut[off]); | |
ef72af40 | 83 | |
7c29a476 MH |
84 | ret |= adp5520_set_bits(dev->master, ADP5520_GPIO_CFG_2, |
85 | dev->lut[off]); | |
ef72af40 MH |
86 | |
87 | return ret; | |
88 | } | |
89 | ||
3836309d | 90 | static int adp5520_gpio_probe(struct platform_device *pdev) |
ef72af40 | 91 | { |
e56aee18 | 92 | struct adp5520_gpio_platform_data *pdata = dev_get_platdata(&pdev->dev); |
ef72af40 MH |
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 | ||
24bb3813 | 108 | dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL); |
ef72af40 MH |
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 | ||
7c29a476 | 137 | ret = adp5520_clr_bits(dev->master, ADP5520_GPIO_CFG_1, |
ef72af40 MH |
138 | pdata->gpio_en_mask); |
139 | ||
7c29a476 MH |
140 | if (pdata->gpio_en_mask & ADP5520_GPIO_C3) |
141 | ctl_mask |= ADP5520_C3_MODE; | |
ef72af40 | 142 | |
7c29a476 MH |
143 | if (pdata->gpio_en_mask & ADP5520_GPIO_R3) |
144 | ctl_mask |= ADP5520_R3_MODE; | |
ef72af40 MH |
145 | |
146 | if (ctl_mask) | |
7c29a476 | 147 | ret = adp5520_set_bits(dev->master, ADP5520_LED_CONTROL, |
ef72af40 MH |
148 | ctl_mask); |
149 | ||
7c29a476 | 150 | ret |= adp5520_set_bits(dev->master, ADP5520_GPIO_PULLUP, |
ef72af40 MH |
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 | ||
165 | err: | |
ef72af40 MH |
166 | return ret; |
167 | } | |
168 | ||
206210ce | 169 | static int adp5520_gpio_remove(struct platform_device *pdev) |
ef72af40 MH |
170 | { |
171 | struct adp5520_gpio *dev; | |
172 | int ret; | |
173 | ||
174 | dev = platform_get_drvdata(pdev); | |
175 | ret = gpiochip_remove(&dev->gpio_chip); | |
176 | if (ret) { | |
177 | dev_err(&pdev->dev, "%s failed, %d\n", | |
178 | "gpiochip_remove()", ret); | |
179 | return ret; | |
180 | } | |
181 | ||
ef72af40 MH |
182 | return 0; |
183 | } | |
184 | ||
185 | static struct platform_driver adp5520_gpio_driver = { | |
186 | .driver = { | |
187 | .name = "adp5520-gpio", | |
188 | .owner = THIS_MODULE, | |
189 | }, | |
190 | .probe = adp5520_gpio_probe, | |
8283c4ff | 191 | .remove = adp5520_gpio_remove, |
ef72af40 MH |
192 | }; |
193 | ||
6f61415e | 194 | module_platform_driver(adp5520_gpio_driver); |
ef72af40 MH |
195 | |
196 | MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>"); | |
197 | MODULE_DESCRIPTION("GPIO ADP5520 Driver"); | |
198 | MODULE_LICENSE("GPL"); | |
199 | MODULE_ALIAS("platform:adp5520-gpio"); |