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26a48c4c TT |
1 | /* |
2 | * Copyright Intel Corporation (C) 2014-2016. All Rights Reserved | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify it | |
5 | * under the terms and conditions of the GNU General Public License, | |
6 | * version 2, as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope it will be useful, but WITHOUT | |
9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
11 | * more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License along with | |
14 | * this program. If not, see <http://www.gnu.org/licenses/>. | |
15 | * | |
16 | * GPIO driver for Altera Arria10 MAX5 System Resource Chip | |
17 | * | |
18 | * Adapted from gpio-tps65910.c | |
19 | */ | |
20 | ||
21 | #include <linux/gpio/driver.h> | |
22 | #include <linux/mfd/altera-a10sr.h> | |
23 | #include <linux/module.h> | |
24 | ||
25 | /** | |
26 | * struct altr_a10sr_gpio - Altera Max5 GPIO device private data structure | |
27 | * @gp: : instance of the gpio_chip | |
28 | * @regmap: the regmap from the parent device. | |
29 | */ | |
30 | struct altr_a10sr_gpio { | |
31 | struct gpio_chip gp; | |
32 | struct regmap *regmap; | |
33 | }; | |
34 | ||
35 | static int altr_a10sr_gpio_get(struct gpio_chip *chip, unsigned int offset) | |
36 | { | |
37 | struct altr_a10sr_gpio *gpio = gpiochip_get_data(chip); | |
38 | int ret, val; | |
39 | ||
40 | ret = regmap_read(gpio->regmap, ALTR_A10SR_PBDSW_REG, &val); | |
41 | if (ret < 0) | |
42 | return ret; | |
43 | ||
44 | return !!(val & BIT(offset - ALTR_A10SR_LED_VALID_SHIFT)); | |
45 | } | |
46 | ||
47 | static void altr_a10sr_gpio_set(struct gpio_chip *chip, unsigned int offset, | |
48 | int value) | |
49 | { | |
50 | struct altr_a10sr_gpio *gpio = gpiochip_get_data(chip); | |
51 | ||
52 | regmap_update_bits(gpio->regmap, ALTR_A10SR_LED_REG, | |
53 | BIT(ALTR_A10SR_LED_VALID_SHIFT + offset), | |
54 | value ? BIT(ALTR_A10SR_LED_VALID_SHIFT + offset) | |
55 | : 0); | |
56 | } | |
57 | ||
58 | static int altr_a10sr_gpio_direction_input(struct gpio_chip *gc, | |
59 | unsigned int nr) | |
60 | { | |
61 | if (nr >= (ALTR_A10SR_IN_VALID_RANGE_LO - ALTR_A10SR_LED_VALID_SHIFT)) | |
62 | return 0; | |
63 | return -EINVAL; | |
64 | } | |
65 | ||
66 | static int altr_a10sr_gpio_direction_output(struct gpio_chip *gc, | |
67 | unsigned int nr, int value) | |
68 | { | |
69 | if (nr <= (ALTR_A10SR_OUT_VALID_RANGE_HI - ALTR_A10SR_LED_VALID_SHIFT)) | |
70 | return 0; | |
71 | return -EINVAL; | |
72 | } | |
73 | ||
74 | static struct gpio_chip altr_a10sr_gc = { | |
75 | .label = "altr_a10sr_gpio", | |
76 | .owner = THIS_MODULE, | |
77 | .get = altr_a10sr_gpio_get, | |
78 | .set = altr_a10sr_gpio_set, | |
79 | .direction_input = altr_a10sr_gpio_direction_input, | |
80 | .direction_output = altr_a10sr_gpio_direction_output, | |
81 | .can_sleep = true, | |
82 | .ngpio = 12, | |
83 | .base = -1, | |
84 | }; | |
85 | ||
86 | static int altr_a10sr_gpio_probe(struct platform_device *pdev) | |
87 | { | |
88 | struct altr_a10sr_gpio *gpio; | |
89 | int ret; | |
90 | struct altr_a10sr *a10sr = dev_get_drvdata(pdev->dev.parent); | |
91 | ||
92 | gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL); | |
93 | if (!gpio) | |
94 | return -ENOMEM; | |
95 | ||
96 | gpio->regmap = a10sr->regmap; | |
97 | ||
98 | gpio->gp = altr_a10sr_gc; | |
99 | ||
100 | gpio->gp.of_node = pdev->dev.of_node; | |
101 | ||
102 | ret = devm_gpiochip_add_data(&pdev->dev, &gpio->gp, gpio); | |
103 | if (ret < 0) { | |
104 | dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret); | |
105 | return ret; | |
106 | } | |
107 | ||
108 | platform_set_drvdata(pdev, gpio); | |
109 | ||
110 | return 0; | |
111 | } | |
112 | ||
26a48c4c TT |
113 | static const struct of_device_id altr_a10sr_gpio_of_match[] = { |
114 | { .compatible = "altr,a10sr-gpio" }, | |
115 | { }, | |
116 | }; | |
117 | MODULE_DEVICE_TABLE(of, altr_a10sr_gpio_of_match); | |
118 | ||
119 | static struct platform_driver altr_a10sr_gpio_driver = { | |
120 | .probe = altr_a10sr_gpio_probe, | |
26a48c4c TT |
121 | .driver = { |
122 | .name = "altr_a10sr_gpio", | |
123 | .of_match_table = of_match_ptr(altr_a10sr_gpio_of_match), | |
124 | }, | |
125 | }; | |
126 | module_platform_driver(altr_a10sr_gpio_driver); | |
127 | ||
128 | MODULE_LICENSE("GPL v2"); | |
129 | MODULE_AUTHOR("Thor Thayer <tthayer@opensource.altera.com>"); | |
130 | MODULE_DESCRIPTION("Altera Arria10 System Resource Chip GPIO"); |