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b4f53ed9 | 1 | // SPDX-License-Identifier: GPL-2.0+ |
70ffd691 PU |
2 | /* |
3 | * Access to GPOs on TWL6040 chip | |
4 | * | |
5 | * Copyright (C) 2012 Texas Instruments, Inc. | |
6 | * | |
7 | * Authors: | |
8 | * Sergio Aguirre <saaguirre@ti.com> | |
9 | * Peter Ujfalusi <peter.ujfalusi@ti.com> | |
70ffd691 PU |
10 | */ |
11 | ||
12 | #include <linux/module.h> | |
13 | #include <linux/init.h> | |
14 | #include <linux/kthread.h> | |
15 | #include <linux/irq.h> | |
fc4f8f32 | 16 | #include <linux/gpio/driver.h> |
70ffd691 | 17 | #include <linux/platform_device.h> |
4bef8bf2 | 18 | #include <linux/bitops.h> |
70ffd691 PU |
19 | #include <linux/of.h> |
20 | ||
21 | #include <linux/mfd/twl6040.h> | |
22 | ||
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23 | static int twl6040gpo_get(struct gpio_chip *chip, unsigned offset) |
24 | { | |
58383c78 | 25 | struct twl6040 *twl6040 = dev_get_drvdata(chip->parent->parent); |
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26 | int ret = 0; |
27 | ||
28 | ret = twl6040_reg_read(twl6040, TWL6040_REG_GPOCTL); | |
29 | if (ret < 0) | |
30 | return ret; | |
31 | ||
4bef8bf2 | 32 | return !!(ret & BIT(offset)); |
70ffd691 PU |
33 | } |
34 | ||
ba74bd5d LW |
35 | static int twl6040gpo_get_direction(struct gpio_chip *chip, unsigned offset) |
36 | { | |
37 | /* This means "out" */ | |
38 | return 0; | |
39 | } | |
40 | ||
70ffd691 PU |
41 | static int twl6040gpo_direction_out(struct gpio_chip *chip, unsigned offset, |
42 | int value) | |
43 | { | |
44 | /* This only drives GPOs, and can't change direction */ | |
45 | return 0; | |
46 | } | |
47 | ||
48 | static void twl6040gpo_set(struct gpio_chip *chip, unsigned offset, int value) | |
49 | { | |
58383c78 | 50 | struct twl6040 *twl6040 = dev_get_drvdata(chip->parent->parent); |
70ffd691 PU |
51 | int ret; |
52 | u8 gpoctl; | |
53 | ||
54 | ret = twl6040_reg_read(twl6040, TWL6040_REG_GPOCTL); | |
55 | if (ret < 0) | |
56 | return; | |
57 | ||
58 | if (value) | |
4bef8bf2 | 59 | gpoctl = ret | BIT(offset); |
70ffd691 | 60 | else |
4bef8bf2 | 61 | gpoctl = ret & ~BIT(offset); |
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62 | |
63 | twl6040_reg_write(twl6040, TWL6040_REG_GPOCTL, gpoctl); | |
64 | } | |
65 | ||
66 | static struct gpio_chip twl6040gpo_chip = { | |
67 | .label = "twl6040", | |
68 | .owner = THIS_MODULE, | |
69 | .get = twl6040gpo_get, | |
70 | .direction_output = twl6040gpo_direction_out, | |
ba74bd5d | 71 | .get_direction = twl6040gpo_get_direction, |
70ffd691 | 72 | .set = twl6040gpo_set, |
9fb1f39e | 73 | .can_sleep = true, |
70ffd691 PU |
74 | }; |
75 | ||
76 | /*----------------------------------------------------------------------*/ | |
77 | ||
3836309d | 78 | static int gpo_twl6040_probe(struct platform_device *pdev) |
70ffd691 | 79 | { |
70ffd691 PU |
80 | struct device *twl6040_core_dev = pdev->dev.parent; |
81 | struct twl6040 *twl6040 = dev_get_drvdata(twl6040_core_dev); | |
82 | int ret; | |
83 | ||
a5d28d79 | 84 | twl6040gpo_chip.base = -1; |
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85 | |
86 | if (twl6040_get_revid(twl6040) < TWL6041_REV_ES2_0) | |
87 | twl6040gpo_chip.ngpio = 3; /* twl6040 have 3 GPO */ | |
88 | else | |
89 | twl6040gpo_chip.ngpio = 1; /* twl6041 have 1 GPO */ | |
90 | ||
58383c78 | 91 | twl6040gpo_chip.parent = &pdev->dev; |
70ffd691 PU |
92 | #ifdef CONFIG_OF_GPIO |
93 | twl6040gpo_chip.of_node = twl6040_core_dev->of_node; | |
94 | #endif | |
95 | ||
fc0292a2 | 96 | ret = devm_gpiochip_add_data(&pdev->dev, &twl6040gpo_chip, NULL); |
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97 | if (ret < 0) { |
98 | dev_err(&pdev->dev, "could not register gpiochip, %d\n", ret); | |
99 | twl6040gpo_chip.ngpio = 0; | |
100 | } | |
101 | ||
102 | return ret; | |
103 | } | |
104 | ||
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105 | /* Note: this hardware lives inside an I2C-based multi-function device. */ |
106 | MODULE_ALIAS("platform:twl6040-gpo"); | |
107 | ||
108 | static struct platform_driver gpo_twl6040_driver = { | |
109 | .driver = { | |
110 | .name = "twl6040-gpo", | |
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111 | }, |
112 | .probe = gpo_twl6040_probe, | |
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113 | }; |
114 | ||
115 | module_platform_driver(gpo_twl6040_driver); | |
116 | ||
117 | MODULE_AUTHOR("Texas Instruments, Inc."); | |
118 | MODULE_DESCRIPTION("GPO interface for TWL6040"); | |
119 | MODULE_LICENSE("GPL"); |