1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * TI TPS6591x GPIO driver
4 *
5 * Copyright 2010 Texas Instruments Inc.
6 *
7 * Author: Graeme Gregory <gg@slimlogic.co.uk>
8 * Author: Jorge Eduardo Candelaria <jedu@slimlogic.co.uk>
9 */
10
11#include <linux/kernel.h>
12#include <linux/init.h>
13#include <linux/errno.h>
14#include <linux/gpio/driver.h>
15#include <linux/i2c.h>
16#include <linux/platform_device.h>
17#include <linux/mfd/tps65910.h>
18#include <linux/of.h>
19
20struct tps65910_gpio {
21	struct gpio_chip gpio_chip;
22	struct tps65910 *tps65910;
23};
24
25static int tps65910_gpio_get(struct gpio_chip *gc, unsigned offset)
26{
27	struct tps65910_gpio *tps65910_gpio = gpiochip_get_data(gc);
28	struct tps65910 *tps65910 = tps65910_gpio->tps65910;
29	unsigned int val;
30
31	regmap_read(tps65910->regmap, TPS65910_GPIO0 + offset, &val);
32
33	if (val & GPIO_STS_MASK)
34		return 1;
35
36	return 0;
37}
38
39static void tps65910_gpio_set(struct gpio_chip *gc, unsigned offset,
40			      int value)
41{
42	struct tps65910_gpio *tps65910_gpio = gpiochip_get_data(gc);
43	struct tps65910 *tps65910 = tps65910_gpio->tps65910;
44
45	if (value)
46		regmap_set_bits(tps65910->regmap, TPS65910_GPIO0 + offset,
47						GPIO_SET_MASK);
48	else
49		regmap_clear_bits(tps65910->regmap, TPS65910_GPIO0 + offset,
50						GPIO_SET_MASK);
51}
52
53static int tps65910_gpio_output(struct gpio_chip *gc, unsigned offset,
54				int value)
55{
56	struct tps65910_gpio *tps65910_gpio = gpiochip_get_data(gc);
57	struct tps65910 *tps65910 = tps65910_gpio->tps65910;
58
59	/* Set the initial value */
60	tps65910_gpio_set(gc, offset, value);
61
62	return regmap_set_bits(tps65910->regmap, TPS65910_GPIO0 + offset,
63						GPIO_CFG_MASK);
64}
65
66static int tps65910_gpio_input(struct gpio_chip *gc, unsigned offset)
67{
68	struct tps65910_gpio *tps65910_gpio = gpiochip_get_data(gc);
69	struct tps65910 *tps65910 = tps65910_gpio->tps65910;
70
71	return regmap_clear_bits(tps65910->regmap, TPS65910_GPIO0 + offset,
72						GPIO_CFG_MASK);
73}
74
75#ifdef CONFIG_OF
76static struct tps65910_board *tps65910_parse_dt_for_gpio(struct device *dev,
77		struct tps65910 *tps65910, int chip_ngpio)
78{
79	struct tps65910_board *tps65910_board = tps65910->of_plat_data;
80	unsigned int prop_array[TPS6591X_MAX_NUM_GPIO];
81	int ngpio = min(chip_ngpio, TPS6591X_MAX_NUM_GPIO);
82	int ret;
83	int idx;
84
85	tps65910_board->gpio_base = -1;
86	ret = of_property_read_u32_array(tps65910->dev->of_node,
87			"ti,en-gpio-sleep", prop_array, ngpio);
88	if (ret < 0) {
89		dev_dbg(dev, "ti,en-gpio-sleep not specified\n");
90		return tps65910_board;
91	}
92
93	for (idx = 0; idx < ngpio; idx++)
94		tps65910_board->en_gpio_sleep[idx] = (prop_array[idx] != 0);
95
96	return tps65910_board;
97}
98#else
99static struct tps65910_board *tps65910_parse_dt_for_gpio(struct device *dev,
100		struct tps65910 *tps65910, int chip_ngpio)
101{
102	return NULL;
103}
104#endif
105
106static int tps65910_gpio_probe(struct platform_device *pdev)
107{
108	struct tps65910 *tps65910 = dev_get_drvdata(pdev->dev.parent);
109	struct tps65910_board *pdata = dev_get_platdata(tps65910->dev);
110	struct tps65910_gpio *tps65910_gpio;
111	int ret;
112	int i;
113
114	device_set_node(&pdev->dev, dev_fwnode(pdev->dev.parent));
115
116	tps65910_gpio = devm_kzalloc(&pdev->dev,
117				sizeof(*tps65910_gpio), GFP_KERNEL);
118	if (!tps65910_gpio)
119		return -ENOMEM;
120
121	tps65910_gpio->tps65910 = tps65910;
122
123	tps65910_gpio->gpio_chip.owner = THIS_MODULE;
124	tps65910_gpio->gpio_chip.label = tps65910->i2c_client->name;
125
126	switch (tps65910_chip_id(tps65910)) {
127	case TPS65910:
128		tps65910_gpio->gpio_chip.ngpio = TPS65910_NUM_GPIO;
129		break;
130	case TPS65911:
131		tps65910_gpio->gpio_chip.ngpio = TPS65911_NUM_GPIO;
132		break;
133	default:
134		return -EINVAL;
135	}
136	tps65910_gpio->gpio_chip.can_sleep = true;
137	tps65910_gpio->gpio_chip.direction_input = tps65910_gpio_input;
138	tps65910_gpio->gpio_chip.direction_output = tps65910_gpio_output;
139	tps65910_gpio->gpio_chip.set	= tps65910_gpio_set;
140	tps65910_gpio->gpio_chip.get	= tps65910_gpio_get;
141	tps65910_gpio->gpio_chip.parent = &pdev->dev;
142
143	if (pdata && pdata->gpio_base)
144		tps65910_gpio->gpio_chip.base = pdata->gpio_base;
145	else
146		tps65910_gpio->gpio_chip.base = -1;
147
148	if (!pdata && tps65910->dev->of_node)
149		pdata = tps65910_parse_dt_for_gpio(&pdev->dev, tps65910,
150			tps65910_gpio->gpio_chip.ngpio);
151
152	if (!pdata)
153		goto skip_init;
154
155	/* Configure sleep control for gpios if provided */
156	for (i = 0; i < tps65910_gpio->gpio_chip.ngpio; ++i) {
157		if (!pdata->en_gpio_sleep[i])
158			continue;
159
160		ret = regmap_set_bits(tps65910->regmap,
161			TPS65910_GPIO0 + i, GPIO_SLEEP_MASK);
162		if (ret < 0)
163			dev_warn(tps65910->dev,
164				"GPIO Sleep setting failed with err %d\n", ret);
165	}
166
167skip_init:
168	return devm_gpiochip_add_data(&pdev->dev, &tps65910_gpio->gpio_chip,
169				      tps65910_gpio);
170}
171
172static struct platform_driver tps65910_gpio_driver = {
173	.driver.name    = "tps65910-gpio",
174	.probe		= tps65910_gpio_probe,
175};
176
177static int __init tps65910_gpio_init(void)
178{
179	return platform_driver_register(&tps65910_gpio_driver);
180}
181subsys_initcall(tps65910_gpio_init);
182