Commit | Line | Data |
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80503b23 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
ef72af40 MH |
2 | /* |
3 | * GPIO driver for Analog Devices ADP5520 MFD PMICs | |
4 | * | |
5 | * Copyright 2009 Analog Devices Inc. | |
ef72af40 MH |
6 | */ |
7 | ||
8 | #include <linux/module.h> | |
5a0e3ad6 | 9 | #include <linux/slab.h> |
ef72af40 MH |
10 | #include <linux/kernel.h> |
11 | #include <linux/init.h> | |
12 | #include <linux/platform_device.h> | |
13 | #include <linux/mfd/adp5520.h> | |
8a3b4f20 | 14 | #include <linux/gpio/driver.h> |
ef72af40 MH |
15 | |
16 | struct adp5520_gpio { | |
17 | struct device *master; | |
18 | struct gpio_chip gpio_chip; | |
19 | unsigned char lut[ADP5520_MAXGPIOS]; | |
20 | unsigned long output; | |
21 | }; | |
22 | ||
23 | static int adp5520_gpio_get_value(struct gpio_chip *chip, unsigned off) | |
24 | { | |
25 | struct adp5520_gpio *dev; | |
26 | uint8_t reg_val; | |
27 | ||
5060e0e8 | 28 | dev = gpiochip_get_data(chip); |
ef72af40 MH |
29 | |
30 | /* | |
31 | * There are dedicated registers for GPIO IN/OUT. | |
32 | * Make sure we return the right value, even when configured as output | |
33 | */ | |
34 | ||
35 | if (test_bit(off, &dev->output)) | |
7c29a476 | 36 | adp5520_read(dev->master, ADP5520_GPIO_OUT, ®_val); |
ef72af40 | 37 | else |
7c29a476 | 38 | adp5520_read(dev->master, ADP5520_GPIO_IN, ®_val); |
ef72af40 MH |
39 | |
40 | return !!(reg_val & dev->lut[off]); | |
41 | } | |
42 | ||
43 | static void adp5520_gpio_set_value(struct gpio_chip *chip, | |
44 | unsigned off, int val) | |
45 | { | |
46 | struct adp5520_gpio *dev; | |
5060e0e8 | 47 | dev = gpiochip_get_data(chip); |
ef72af40 MH |
48 | |
49 | if (val) | |
7c29a476 | 50 | adp5520_set_bits(dev->master, ADP5520_GPIO_OUT, dev->lut[off]); |
ef72af40 | 51 | else |
7c29a476 | 52 | adp5520_clr_bits(dev->master, ADP5520_GPIO_OUT, dev->lut[off]); |
ef72af40 MH |
53 | } |
54 | ||
55 | static int adp5520_gpio_direction_input(struct gpio_chip *chip, unsigned off) | |
56 | { | |
57 | struct adp5520_gpio *dev; | |
5060e0e8 | 58 | dev = gpiochip_get_data(chip); |
ef72af40 MH |
59 | |
60 | clear_bit(off, &dev->output); | |
61 | ||
7c29a476 MH |
62 | return adp5520_clr_bits(dev->master, ADP5520_GPIO_CFG_2, |
63 | dev->lut[off]); | |
ef72af40 MH |
64 | } |
65 | ||
66 | static int adp5520_gpio_direction_output(struct gpio_chip *chip, | |
67 | unsigned off, int val) | |
68 | { | |
69 | struct adp5520_gpio *dev; | |
70 | int ret = 0; | |
5060e0e8 | 71 | dev = gpiochip_get_data(chip); |
ef72af40 MH |
72 | |
73 | set_bit(off, &dev->output); | |
74 | ||
75 | if (val) | |
7c29a476 MH |
76 | ret |= adp5520_set_bits(dev->master, ADP5520_GPIO_OUT, |
77 | dev->lut[off]); | |
ef72af40 | 78 | else |
7c29a476 MH |
79 | ret |= adp5520_clr_bits(dev->master, ADP5520_GPIO_OUT, |
80 | dev->lut[off]); | |
ef72af40 | 81 | |
7c29a476 MH |
82 | ret |= adp5520_set_bits(dev->master, ADP5520_GPIO_CFG_2, |
83 | dev->lut[off]); | |
ef72af40 MH |
84 | |
85 | return ret; | |
86 | } | |
87 | ||
3836309d | 88 | static int adp5520_gpio_probe(struct platform_device *pdev) |
ef72af40 | 89 | { |
e56aee18 | 90 | struct adp5520_gpio_platform_data *pdata = dev_get_platdata(&pdev->dev); |
ef72af40 MH |
91 | struct adp5520_gpio *dev; |
92 | struct gpio_chip *gc; | |
93 | int ret, i, gpios; | |
94 | unsigned char ctl_mask = 0; | |
95 | ||
96 | if (pdata == NULL) { | |
97 | dev_err(&pdev->dev, "missing platform data\n"); | |
98 | return -ENODEV; | |
99 | } | |
100 | ||
101 | if (pdev->id != ID_ADP5520) { | |
102 | dev_err(&pdev->dev, "only ADP5520 supports GPIO\n"); | |
103 | return -ENODEV; | |
104 | } | |
105 | ||
24bb3813 | 106 | dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL); |
e8a71aaa | 107 | if (dev == NULL) |
ef72af40 | 108 | return -ENOMEM; |
ef72af40 MH |
109 | |
110 | dev->master = pdev->dev.parent; | |
111 | ||
112 | for (gpios = 0, i = 0; i < ADP5520_MAXGPIOS; i++) | |
113 | if (pdata->gpio_en_mask & (1 << i)) | |
114 | dev->lut[gpios++] = 1 << i; | |
115 | ||
6681db5e AA |
116 | if (gpios < 1) |
117 | return -EINVAL; | |
ef72af40 MH |
118 | |
119 | gc = &dev->gpio_chip; | |
120 | gc->direction_input = adp5520_gpio_direction_input; | |
121 | gc->direction_output = adp5520_gpio_direction_output; | |
122 | gc->get = adp5520_gpio_get_value; | |
123 | gc->set = adp5520_gpio_set_value; | |
9fb1f39e | 124 | gc->can_sleep = true; |
ef72af40 MH |
125 | |
126 | gc->base = pdata->gpio_start; | |
127 | gc->ngpio = gpios; | |
128 | gc->label = pdev->name; | |
129 | gc->owner = THIS_MODULE; | |
130 | ||
7c29a476 | 131 | ret = adp5520_clr_bits(dev->master, ADP5520_GPIO_CFG_1, |
ef72af40 MH |
132 | pdata->gpio_en_mask); |
133 | ||
7c29a476 MH |
134 | if (pdata->gpio_en_mask & ADP5520_GPIO_C3) |
135 | ctl_mask |= ADP5520_C3_MODE; | |
ef72af40 | 136 | |
7c29a476 MH |
137 | if (pdata->gpio_en_mask & ADP5520_GPIO_R3) |
138 | ctl_mask |= ADP5520_R3_MODE; | |
ef72af40 MH |
139 | |
140 | if (ctl_mask) | |
7c29a476 | 141 | ret = adp5520_set_bits(dev->master, ADP5520_LED_CONTROL, |
ef72af40 MH |
142 | ctl_mask); |
143 | ||
7c29a476 | 144 | ret |= adp5520_set_bits(dev->master, ADP5520_GPIO_PULLUP, |
ef72af40 MH |
145 | pdata->gpio_pullup_mask); |
146 | ||
147 | if (ret) { | |
148 | dev_err(&pdev->dev, "failed to write\n"); | |
6681db5e | 149 | return ret; |
ef72af40 MH |
150 | } |
151 | ||
6681db5e | 152 | return devm_gpiochip_add_data(&pdev->dev, &dev->gpio_chip, dev); |
ef72af40 MH |
153 | } |
154 | ||
ef72af40 MH |
155 | static struct platform_driver adp5520_gpio_driver = { |
156 | .driver = { | |
157 | .name = "adp5520-gpio", | |
ef72af40 MH |
158 | }, |
159 | .probe = adp5520_gpio_probe, | |
ef72af40 MH |
160 | }; |
161 | ||
6f61415e | 162 | module_platform_driver(adp5520_gpio_driver); |
ef72af40 | 163 | |
be887843 | 164 | MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>"); |
ef72af40 MH |
165 | MODULE_DESCRIPTION("GPIO ADP5520 Driver"); |
166 | MODULE_LICENSE("GPL"); | |
167 | MODULE_ALIAS("platform:adp5520-gpio"); |