1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * TI TPS6586x GPIO driver
4 *
5 * Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved.
6 * Author: Laxman dewangan <ldewangan@nvidia.com>
7 *
8 * Based on tps6586x.c
9 * Copyright (c) 2010 CompuLab Ltd.
10 * Mike Rapoport <mike@compulab.co.il>
11 */
12
13 #include <linux/errno.h>
14 #include <linux/gpio/driver.h>
15 #include <linux/kernel.h>
16 #include <linux/init.h>
17 #include <linux/mfd/tps6586x.h>
18 #include <linux/of.h>
19 #include <linux/platform_device.h>
20
21 /* GPIO control registers */
22 #define TPS6586X_GPIOSET1 0x5d
23 #define TPS6586X_GPIOSET2 0x5e
24
25 struct tps6586x_gpio {
26 struct gpio_chip gpio_chip;
27 struct device *parent;
28 };
29
tps6586x_gpio_get(struct gpio_chip * gc,unsigned offset)30 static int tps6586x_gpio_get(struct gpio_chip *gc, unsigned offset)
31 {
32 struct tps6586x_gpio *tps6586x_gpio = gpiochip_get_data(gc);
33 uint8_t val;
34 int ret;
35
36 ret = tps6586x_read(tps6586x_gpio->parent, TPS6586X_GPIOSET2, &val);
37 if (ret)
38 return ret;
39
40 return !!(val & (1 << offset));
41 }
42
tps6586x_gpio_set(struct gpio_chip * gc,unsigned offset,int value)43 static void tps6586x_gpio_set(struct gpio_chip *gc, unsigned offset,
44 int value)
45 {
46 struct tps6586x_gpio *tps6586x_gpio = gpiochip_get_data(gc);
47
48 tps6586x_update(tps6586x_gpio->parent, TPS6586X_GPIOSET2,
49 value << offset, 1 << offset);
50 }
51
tps6586x_gpio_output(struct gpio_chip * gc,unsigned offset,int value)52 static int tps6586x_gpio_output(struct gpio_chip *gc, unsigned offset,
53 int value)
54 {
55 struct tps6586x_gpio *tps6586x_gpio = gpiochip_get_data(gc);
56 uint8_t val, mask;
57
58 tps6586x_gpio_set(gc, offset, value);
59
60 val = 0x1 << (offset * 2);
61 mask = 0x3 << (offset * 2);
62
63 return tps6586x_update(tps6586x_gpio->parent, TPS6586X_GPIOSET1,
64 val, mask);
65 }
66
tps6586x_gpio_to_irq(struct gpio_chip * gc,unsigned offset)67 static int tps6586x_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
68 {
69 struct tps6586x_gpio *tps6586x_gpio = gpiochip_get_data(gc);
70
71 return tps6586x_irq_get_virq(tps6586x_gpio->parent,
72 TPS6586X_INT_PLDO_0 + offset);
73 }
74
tps6586x_gpio_probe(struct platform_device * pdev)75 static int tps6586x_gpio_probe(struct platform_device *pdev)
76 {
77 struct tps6586x_platform_data *pdata;
78 struct tps6586x_gpio *tps6586x_gpio;
79
80 device_set_node(&pdev->dev, dev_fwnode(pdev->dev.parent));
81
82 pdata = dev_get_platdata(pdev->dev.parent);
83 tps6586x_gpio = devm_kzalloc(&pdev->dev,
84 sizeof(*tps6586x_gpio), GFP_KERNEL);
85 if (!tps6586x_gpio)
86 return -ENOMEM;
87
88 tps6586x_gpio->parent = pdev->dev.parent;
89
90 tps6586x_gpio->gpio_chip.owner = THIS_MODULE;
91 tps6586x_gpio->gpio_chip.label = pdev->name;
92 tps6586x_gpio->gpio_chip.parent = &pdev->dev;
93 tps6586x_gpio->gpio_chip.ngpio = 4;
94 tps6586x_gpio->gpio_chip.can_sleep = true;
95
96 /* FIXME: add handling of GPIOs as dedicated inputs */
97 tps6586x_gpio->gpio_chip.direction_output = tps6586x_gpio_output;
98 tps6586x_gpio->gpio_chip.set = tps6586x_gpio_set;
99 tps6586x_gpio->gpio_chip.get = tps6586x_gpio_get;
100 tps6586x_gpio->gpio_chip.to_irq = tps6586x_gpio_to_irq;
101
102 if (pdata && pdata->gpio_base)
103 tps6586x_gpio->gpio_chip.base = pdata->gpio_base;
104 else
105 tps6586x_gpio->gpio_chip.base = -1;
106
107 return devm_gpiochip_add_data(&pdev->dev, &tps6586x_gpio->gpio_chip,
108 tps6586x_gpio);
109 }
110
111 static struct platform_driver tps6586x_gpio_driver = {
112 .driver.name = "tps6586x-gpio",
113 .probe = tps6586x_gpio_probe,
114 };
115
tps6586x_gpio_init(void)116 static int __init tps6586x_gpio_init(void)
117 {
118 return platform_driver_register(&tps6586x_gpio_driver);
119 }
120 subsys_initcall(tps6586x_gpio_init);
121