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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 */
30struct altr_a10sr_gpio {
31 struct gpio_chip gp;
32 struct regmap *regmap;
33};
34
35static 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
47static 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
58static 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 -EINVAL;
63
64 return 0;
65}
66
67static int altr_a10sr_gpio_direction_output(struct gpio_chip *gc,
68 unsigned int nr, int value)
69{
70 if (nr > (ALTR_A10SR_OUT_VALID_RANGE_HI - ALTR_A10SR_LED_VALID_SHIFT))
71 return -EINVAL;
72
73 altr_a10sr_gpio_set(gc, nr, value);
74 return 0;
75}
76
77static const struct gpio_chip altr_a10sr_gc = {
78 .label = "altr_a10sr_gpio",
79 .owner = THIS_MODULE,
80 .get = altr_a10sr_gpio_get,
81 .set = altr_a10sr_gpio_set,
82 .direction_input = altr_a10sr_gpio_direction_input,
83 .direction_output = altr_a10sr_gpio_direction_output,
84 .can_sleep = true,
85 .ngpio = 12,
86 .base = -1,
87};
88
89static int altr_a10sr_gpio_probe(struct platform_device *pdev)
90{
91 struct altr_a10sr_gpio *gpio;
92 int ret;
93 struct altr_a10sr *a10sr = dev_get_drvdata(pdev->dev.parent);
94
95 gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
96 if (!gpio)
97 return -ENOMEM;
98
99 gpio->regmap = a10sr->regmap;
100
101 gpio->gp = altr_a10sr_gc;
102 gpio->gp.parent = pdev->dev.parent;
103 gpio->gp.of_node = pdev->dev.of_node;
104
105 ret = devm_gpiochip_add_data(&pdev->dev, &gpio->gp, gpio);
106 if (ret < 0) {
107 dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
108 return ret;
109 }
110
111 platform_set_drvdata(pdev, gpio);
112
113 return 0;
114}
115
116static const struct of_device_id altr_a10sr_gpio_of_match[] = {
117 { .compatible = "altr,a10sr-gpio" },
118 { },
119};
120MODULE_DEVICE_TABLE(of, altr_a10sr_gpio_of_match);
121
122static struct platform_driver altr_a10sr_gpio_driver = {
123 .probe = altr_a10sr_gpio_probe,
124 .driver = {
125 .name = "altr_a10sr_gpio",
126 .of_match_table = of_match_ptr(altr_a10sr_gpio_of_match),
127 },
128};
129module_platform_driver(altr_a10sr_gpio_driver);
130
131MODULE_LICENSE("GPL v2");
132MODULE_AUTHOR("Thor Thayer <tthayer@opensource.altera.com>");
133MODULE_DESCRIPTION("Altera Arria10 System Resource Chip GPIO");
134

Warning: That file was not part of the compilation database. It may have many parsing errors.