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9952f691 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
26a48c4c TT |
2 | /* |
3 | * Copyright Intel Corporation (C) 2014-2016. All Rights Reserved | |
4 | * | |
26a48c4c TT |
5 | * GPIO driver for Altera Arria10 MAX5 System Resource Chip |
6 | * | |
7 | * Adapted from gpio-tps65910.c | |
8 | */ | |
9 | ||
10 | #include <linux/gpio/driver.h> | |
11 | #include <linux/mfd/altera-a10sr.h> | |
12 | #include <linux/module.h> | |
13 | ||
14 | /** | |
15 | * struct altr_a10sr_gpio - Altera Max5 GPIO device private data structure | |
16 | * @gp: : instance of the gpio_chip | |
17 | * @regmap: the regmap from the parent device. | |
18 | */ | |
19 | struct altr_a10sr_gpio { | |
20 | struct gpio_chip gp; | |
21 | struct regmap *regmap; | |
22 | }; | |
23 | ||
24 | static int altr_a10sr_gpio_get(struct gpio_chip *chip, unsigned int offset) | |
25 | { | |
26 | struct altr_a10sr_gpio *gpio = gpiochip_get_data(chip); | |
27 | int ret, val; | |
28 | ||
29 | ret = regmap_read(gpio->regmap, ALTR_A10SR_PBDSW_REG, &val); | |
30 | if (ret < 0) | |
31 | return ret; | |
32 | ||
33 | return !!(val & BIT(offset - ALTR_A10SR_LED_VALID_SHIFT)); | |
34 | } | |
35 | ||
36 | static void altr_a10sr_gpio_set(struct gpio_chip *chip, unsigned int offset, | |
37 | int value) | |
38 | { | |
39 | struct altr_a10sr_gpio *gpio = gpiochip_get_data(chip); | |
40 | ||
41 | regmap_update_bits(gpio->regmap, ALTR_A10SR_LED_REG, | |
42 | BIT(ALTR_A10SR_LED_VALID_SHIFT + offset), | |
43 | value ? BIT(ALTR_A10SR_LED_VALID_SHIFT + offset) | |
44 | : 0); | |
45 | } | |
46 | ||
47 | static int altr_a10sr_gpio_direction_input(struct gpio_chip *gc, | |
48 | unsigned int nr) | |
49 | { | |
68b7587b AL |
50 | if (nr < (ALTR_A10SR_IN_VALID_RANGE_LO - ALTR_A10SR_LED_VALID_SHIFT)) |
51 | return -EINVAL; | |
52 | ||
53 | return 0; | |
26a48c4c TT |
54 | } |
55 | ||
56 | static int altr_a10sr_gpio_direction_output(struct gpio_chip *gc, | |
57 | unsigned int nr, int value) | |
58 | { | |
68b7587b AL |
59 | if (nr > (ALTR_A10SR_OUT_VALID_RANGE_HI - ALTR_A10SR_LED_VALID_SHIFT)) |
60 | return -EINVAL; | |
61 | ||
62 | altr_a10sr_gpio_set(gc, nr, value); | |
63 | return 0; | |
26a48c4c TT |
64 | } |
65 | ||
1a20c3f8 | 66 | static const struct gpio_chip altr_a10sr_gc = { |
26a48c4c TT |
67 | .label = "altr_a10sr_gpio", |
68 | .owner = THIS_MODULE, | |
69 | .get = altr_a10sr_gpio_get, | |
70 | .set = altr_a10sr_gpio_set, | |
71 | .direction_input = altr_a10sr_gpio_direction_input, | |
72 | .direction_output = altr_a10sr_gpio_direction_output, | |
73 | .can_sleep = true, | |
74 | .ngpio = 12, | |
75 | .base = -1, | |
76 | }; | |
77 | ||
78 | static int altr_a10sr_gpio_probe(struct platform_device *pdev) | |
79 | { | |
80 | struct altr_a10sr_gpio *gpio; | |
81 | int ret; | |
82 | struct altr_a10sr *a10sr = dev_get_drvdata(pdev->dev.parent); | |
83 | ||
84 | gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL); | |
85 | if (!gpio) | |
86 | return -ENOMEM; | |
87 | ||
88 | gpio->regmap = a10sr->regmap; | |
89 | ||
90 | gpio->gp = altr_a10sr_gc; | |
9ce9f799 | 91 | gpio->gp.parent = pdev->dev.parent; |
26a48c4c TT |
92 | gpio->gp.of_node = pdev->dev.of_node; |
93 | ||
94 | ret = devm_gpiochip_add_data(&pdev->dev, &gpio->gp, gpio); | |
95 | if (ret < 0) { | |
96 | dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret); | |
97 | return ret; | |
98 | } | |
99 | ||
100 | platform_set_drvdata(pdev, gpio); | |
101 | ||
102 | return 0; | |
103 | } | |
104 | ||
26a48c4c TT |
105 | static const struct of_device_id altr_a10sr_gpio_of_match[] = { |
106 | { .compatible = "altr,a10sr-gpio" }, | |
107 | { }, | |
108 | }; | |
109 | MODULE_DEVICE_TABLE(of, altr_a10sr_gpio_of_match); | |
110 | ||
111 | static struct platform_driver altr_a10sr_gpio_driver = { | |
112 | .probe = altr_a10sr_gpio_probe, | |
26a48c4c TT |
113 | .driver = { |
114 | .name = "altr_a10sr_gpio", | |
115 | .of_match_table = of_match_ptr(altr_a10sr_gpio_of_match), | |
116 | }, | |
117 | }; | |
118 | module_platform_driver(altr_a10sr_gpio_driver); | |
119 | ||
120 | MODULE_LICENSE("GPL v2"); | |
121 | MODULE_AUTHOR("Thor Thayer <tthayer@opensource.altera.com>"); | |
122 | MODULE_DESCRIPTION("Altera Arria10 System Resource Chip GPIO"); |