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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> | |
a374467a | 12 | #include <linux/mod_devicetable.h> |
26a48c4c | 13 | #include <linux/module.h> |
f473bdcc | 14 | #include <linux/property.h> |
26a48c4c TT |
15 | |
16 | /** | |
17 | * struct altr_a10sr_gpio - Altera Max5 GPIO device private data structure | |
18 | * @gp: : instance of the gpio_chip | |
19 | * @regmap: the regmap from the parent device. | |
20 | */ | |
21 | struct altr_a10sr_gpio { | |
22 | struct gpio_chip gp; | |
23 | struct regmap *regmap; | |
24 | }; | |
25 | ||
26 | static int altr_a10sr_gpio_get(struct gpio_chip *chip, unsigned int offset) | |
27 | { | |
28 | struct altr_a10sr_gpio *gpio = gpiochip_get_data(chip); | |
29 | int ret, val; | |
30 | ||
31 | ret = regmap_read(gpio->regmap, ALTR_A10SR_PBDSW_REG, &val); | |
32 | if (ret < 0) | |
33 | return ret; | |
34 | ||
35 | return !!(val & BIT(offset - ALTR_A10SR_LED_VALID_SHIFT)); | |
36 | } | |
37 | ||
38 | static void altr_a10sr_gpio_set(struct gpio_chip *chip, unsigned int offset, | |
39 | int value) | |
40 | { | |
41 | struct altr_a10sr_gpio *gpio = gpiochip_get_data(chip); | |
42 | ||
43 | regmap_update_bits(gpio->regmap, ALTR_A10SR_LED_REG, | |
44 | BIT(ALTR_A10SR_LED_VALID_SHIFT + offset), | |
45 | value ? BIT(ALTR_A10SR_LED_VALID_SHIFT + offset) | |
46 | : 0); | |
47 | } | |
48 | ||
49 | static int altr_a10sr_gpio_direction_input(struct gpio_chip *gc, | |
50 | unsigned int nr) | |
51 | { | |
68b7587b AL |
52 | if (nr < (ALTR_A10SR_IN_VALID_RANGE_LO - ALTR_A10SR_LED_VALID_SHIFT)) |
53 | return -EINVAL; | |
54 | ||
55 | return 0; | |
26a48c4c TT |
56 | } |
57 | ||
58 | static int altr_a10sr_gpio_direction_output(struct gpio_chip *gc, | |
59 | unsigned int nr, int value) | |
60 | { | |
68b7587b AL |
61 | if (nr > (ALTR_A10SR_OUT_VALID_RANGE_HI - ALTR_A10SR_LED_VALID_SHIFT)) |
62 | return -EINVAL; | |
63 | ||
64 | altr_a10sr_gpio_set(gc, nr, value); | |
65 | return 0; | |
26a48c4c TT |
66 | } |
67 | ||
1a20c3f8 | 68 | static const struct gpio_chip altr_a10sr_gc = { |
26a48c4c TT |
69 | .label = "altr_a10sr_gpio", |
70 | .owner = THIS_MODULE, | |
71 | .get = altr_a10sr_gpio_get, | |
72 | .set = altr_a10sr_gpio_set, | |
73 | .direction_input = altr_a10sr_gpio_direction_input, | |
74 | .direction_output = altr_a10sr_gpio_direction_output, | |
75 | .can_sleep = true, | |
76 | .ngpio = 12, | |
77 | .base = -1, | |
78 | }; | |
79 | ||
80 | static int altr_a10sr_gpio_probe(struct platform_device *pdev) | |
81 | { | |
82 | struct altr_a10sr_gpio *gpio; | |
26a48c4c TT |
83 | struct altr_a10sr *a10sr = dev_get_drvdata(pdev->dev.parent); |
84 | ||
85 | gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL); | |
86 | if (!gpio) | |
87 | return -ENOMEM; | |
88 | ||
89 | gpio->regmap = a10sr->regmap; | |
90 | ||
91 | gpio->gp = altr_a10sr_gc; | |
9ce9f799 | 92 | gpio->gp.parent = pdev->dev.parent; |
f473bdcc | 93 | gpio->gp.fwnode = dev_fwnode(&pdev->dev); |
26a48c4c | 94 | |
aa93b0f3 | 95 | return devm_gpiochip_add_data(&pdev->dev, &gpio->gp, gpio); |
26a48c4c TT |
96 | } |
97 | ||
26a48c4c TT |
98 | static const struct of_device_id altr_a10sr_gpio_of_match[] = { |
99 | { .compatible = "altr,a10sr-gpio" }, | |
100 | { }, | |
101 | }; | |
102 | MODULE_DEVICE_TABLE(of, altr_a10sr_gpio_of_match); | |
103 | ||
104 | static struct platform_driver altr_a10sr_gpio_driver = { | |
105 | .probe = altr_a10sr_gpio_probe, | |
26a48c4c TT |
106 | .driver = { |
107 | .name = "altr_a10sr_gpio", | |
a374467a | 108 | .of_match_table = altr_a10sr_gpio_of_match, |
26a48c4c TT |
109 | }, |
110 | }; | |
111 | module_platform_driver(altr_a10sr_gpio_driver); | |
112 | ||
113 | MODULE_LICENSE("GPL v2"); | |
114 | MODULE_AUTHOR("Thor Thayer <tthayer@opensource.altera.com>"); | |
115 | MODULE_DESCRIPTION("Altera Arria10 System Resource Chip GPIO"); |