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 | |
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(dev: tps6586x_gpio->parent, TPS6586X_GPIOSET2, val: &val); |
37 | if (ret) |
38 | return ret; |
39 | |
40 | return !!(val & (1 << offset)); |
41 | } |
42 | |
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(dev: tps6586x_gpio->parent, TPS6586X_GPIOSET2, |
49 | val: value << offset, mask: 1 << offset); |
50 | } |
51 | |
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(dev: tps6586x_gpio->parent, TPS6586X_GPIOSET1, |
64 | val, mask); |
65 | } |
66 | |
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(dev: tps6586x_gpio->parent, |
72 | irq: TPS6586X_INT_PLDO_0 + offset); |
73 | } |
74 | |
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(dev: &pdev->dev, dev_fwnode(pdev->dev.parent)); |
81 | |
82 | pdata = dev_get_platdata(dev: pdev->dev.parent); |
83 | tps6586x_gpio = devm_kzalloc(dev: &pdev->dev, |
84 | size: 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 | |
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 | |