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