1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0+
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * Access to GPOs on TWL6040 chip
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Copyright (C) 2012 Texas Instruments, Inc.
6*4882a593Smuzhiyun *
7*4882a593Smuzhiyun * Authors:
8*4882a593Smuzhiyun * Sergio Aguirre <saaguirre@ti.com>
9*4882a593Smuzhiyun * Peter Ujfalusi <peter.ujfalusi@ti.com>
10*4882a593Smuzhiyun */
11*4882a593Smuzhiyun
12*4882a593Smuzhiyun #include <linux/module.h>
13*4882a593Smuzhiyun #include <linux/init.h>
14*4882a593Smuzhiyun #include <linux/kthread.h>
15*4882a593Smuzhiyun #include <linux/irq.h>
16*4882a593Smuzhiyun #include <linux/gpio/driver.h>
17*4882a593Smuzhiyun #include <linux/platform_device.h>
18*4882a593Smuzhiyun #include <linux/bitops.h>
19*4882a593Smuzhiyun #include <linux/of.h>
20*4882a593Smuzhiyun
21*4882a593Smuzhiyun #include <linux/mfd/twl6040.h>
22*4882a593Smuzhiyun
twl6040gpo_get(struct gpio_chip * chip,unsigned offset)23*4882a593Smuzhiyun static int twl6040gpo_get(struct gpio_chip *chip, unsigned offset)
24*4882a593Smuzhiyun {
25*4882a593Smuzhiyun struct twl6040 *twl6040 = dev_get_drvdata(chip->parent->parent);
26*4882a593Smuzhiyun int ret = 0;
27*4882a593Smuzhiyun
28*4882a593Smuzhiyun ret = twl6040_reg_read(twl6040, TWL6040_REG_GPOCTL);
29*4882a593Smuzhiyun if (ret < 0)
30*4882a593Smuzhiyun return ret;
31*4882a593Smuzhiyun
32*4882a593Smuzhiyun return !!(ret & BIT(offset));
33*4882a593Smuzhiyun }
34*4882a593Smuzhiyun
twl6040gpo_get_direction(struct gpio_chip * chip,unsigned offset)35*4882a593Smuzhiyun static int twl6040gpo_get_direction(struct gpio_chip *chip, unsigned offset)
36*4882a593Smuzhiyun {
37*4882a593Smuzhiyun return GPIO_LINE_DIRECTION_OUT;
38*4882a593Smuzhiyun }
39*4882a593Smuzhiyun
twl6040gpo_direction_out(struct gpio_chip * chip,unsigned offset,int value)40*4882a593Smuzhiyun static int twl6040gpo_direction_out(struct gpio_chip *chip, unsigned offset,
41*4882a593Smuzhiyun int value)
42*4882a593Smuzhiyun {
43*4882a593Smuzhiyun /* This only drives GPOs, and can't change direction */
44*4882a593Smuzhiyun return 0;
45*4882a593Smuzhiyun }
46*4882a593Smuzhiyun
twl6040gpo_set(struct gpio_chip * chip,unsigned offset,int value)47*4882a593Smuzhiyun static void twl6040gpo_set(struct gpio_chip *chip, unsigned offset, int value)
48*4882a593Smuzhiyun {
49*4882a593Smuzhiyun struct twl6040 *twl6040 = dev_get_drvdata(chip->parent->parent);
50*4882a593Smuzhiyun int ret;
51*4882a593Smuzhiyun u8 gpoctl;
52*4882a593Smuzhiyun
53*4882a593Smuzhiyun ret = twl6040_reg_read(twl6040, TWL6040_REG_GPOCTL);
54*4882a593Smuzhiyun if (ret < 0)
55*4882a593Smuzhiyun return;
56*4882a593Smuzhiyun
57*4882a593Smuzhiyun if (value)
58*4882a593Smuzhiyun gpoctl = ret | BIT(offset);
59*4882a593Smuzhiyun else
60*4882a593Smuzhiyun gpoctl = ret & ~BIT(offset);
61*4882a593Smuzhiyun
62*4882a593Smuzhiyun twl6040_reg_write(twl6040, TWL6040_REG_GPOCTL, gpoctl);
63*4882a593Smuzhiyun }
64*4882a593Smuzhiyun
65*4882a593Smuzhiyun static struct gpio_chip twl6040gpo_chip = {
66*4882a593Smuzhiyun .label = "twl6040",
67*4882a593Smuzhiyun .owner = THIS_MODULE,
68*4882a593Smuzhiyun .get = twl6040gpo_get,
69*4882a593Smuzhiyun .direction_output = twl6040gpo_direction_out,
70*4882a593Smuzhiyun .get_direction = twl6040gpo_get_direction,
71*4882a593Smuzhiyun .set = twl6040gpo_set,
72*4882a593Smuzhiyun .can_sleep = true,
73*4882a593Smuzhiyun };
74*4882a593Smuzhiyun
75*4882a593Smuzhiyun /*----------------------------------------------------------------------*/
76*4882a593Smuzhiyun
gpo_twl6040_probe(struct platform_device * pdev)77*4882a593Smuzhiyun static int gpo_twl6040_probe(struct platform_device *pdev)
78*4882a593Smuzhiyun {
79*4882a593Smuzhiyun struct device *twl6040_core_dev = pdev->dev.parent;
80*4882a593Smuzhiyun struct twl6040 *twl6040 = dev_get_drvdata(twl6040_core_dev);
81*4882a593Smuzhiyun int ret;
82*4882a593Smuzhiyun
83*4882a593Smuzhiyun twl6040gpo_chip.base = -1;
84*4882a593Smuzhiyun
85*4882a593Smuzhiyun if (twl6040_get_revid(twl6040) < TWL6041_REV_ES2_0)
86*4882a593Smuzhiyun twl6040gpo_chip.ngpio = 3; /* twl6040 have 3 GPO */
87*4882a593Smuzhiyun else
88*4882a593Smuzhiyun twl6040gpo_chip.ngpio = 1; /* twl6041 have 1 GPO */
89*4882a593Smuzhiyun
90*4882a593Smuzhiyun twl6040gpo_chip.parent = &pdev->dev;
91*4882a593Smuzhiyun #ifdef CONFIG_OF_GPIO
92*4882a593Smuzhiyun twl6040gpo_chip.of_node = twl6040_core_dev->of_node;
93*4882a593Smuzhiyun #endif
94*4882a593Smuzhiyun
95*4882a593Smuzhiyun ret = devm_gpiochip_add_data(&pdev->dev, &twl6040gpo_chip, NULL);
96*4882a593Smuzhiyun if (ret < 0) {
97*4882a593Smuzhiyun dev_err(&pdev->dev, "could not register gpiochip, %d\n", ret);
98*4882a593Smuzhiyun twl6040gpo_chip.ngpio = 0;
99*4882a593Smuzhiyun }
100*4882a593Smuzhiyun
101*4882a593Smuzhiyun return ret;
102*4882a593Smuzhiyun }
103*4882a593Smuzhiyun
104*4882a593Smuzhiyun /* Note: this hardware lives inside an I2C-based multi-function device. */
105*4882a593Smuzhiyun MODULE_ALIAS("platform:twl6040-gpo");
106*4882a593Smuzhiyun
107*4882a593Smuzhiyun static struct platform_driver gpo_twl6040_driver = {
108*4882a593Smuzhiyun .driver = {
109*4882a593Smuzhiyun .name = "twl6040-gpo",
110*4882a593Smuzhiyun },
111*4882a593Smuzhiyun .probe = gpo_twl6040_probe,
112*4882a593Smuzhiyun };
113*4882a593Smuzhiyun
114*4882a593Smuzhiyun module_platform_driver(gpo_twl6040_driver);
115*4882a593Smuzhiyun
116*4882a593Smuzhiyun MODULE_AUTHOR("Texas Instruments, Inc.");
117*4882a593Smuzhiyun MODULE_DESCRIPTION("GPO interface for TWL6040");
118*4882a593Smuzhiyun MODULE_LICENSE("GPL");
119