1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * TI Palma series PMIC's GPIO driver.
4 *
5 * Copyright (c) 2012, NVIDIA CORPORATION.  All rights reserved.
6 *
7 * Author: Laxman Dewangan <ldewangan@nvidia.com>
8 */
9
10#include <linux/gpio/driver.h>
11#include <linux/kernel.h>
12#include <linux/init.h>
13#include <linux/mfd/palmas.h>
14#include <linux/of.h>
15#include <linux/platform_device.h>
16
17struct palmas_gpio {
18	struct gpio_chip gpio_chip;
19	struct palmas *palmas;
20};
21
22struct palmas_device_data {
23	int ngpio;
24};
25
26static int palmas_gpio_get(struct gpio_chip *gc, unsigned offset)
27{
28	struct palmas_gpio *pg = gpiochip_get_data(gc);
29	struct palmas *palmas = pg->palmas;
30	unsigned int val;
31	int ret;
32	unsigned int reg;
33	int gpio16 = (offset/8);
34
35	offset %= 8;
36	reg = (gpio16) ? PALMAS_GPIO_DATA_DIR2 : PALMAS_GPIO_DATA_DIR;
37
38	ret = palmas_read(palmas, PALMAS_GPIO_BASE, reg, &val);
39	if (ret < 0) {
40		dev_err(gc->parent, "Reg 0x%02x read failed, %d\n", reg, ret);
41		return ret;
42	}
43
44	if (val & BIT(offset))
45		reg = (gpio16) ? PALMAS_GPIO_DATA_OUT2 : PALMAS_GPIO_DATA_OUT;
46	else
47		reg = (gpio16) ? PALMAS_GPIO_DATA_IN2 : PALMAS_GPIO_DATA_IN;
48
49	ret = palmas_read(palmas, PALMAS_GPIO_BASE, reg, &val);
50	if (ret < 0) {
51		dev_err(gc->parent, "Reg 0x%02x read failed, %d\n", reg, ret);
52		return ret;
53	}
54	return !!(val & BIT(offset));
55}
56
57static void palmas_gpio_set(struct gpio_chip *gc, unsigned offset,
58			int value)
59{
60	struct palmas_gpio *pg = gpiochip_get_data(gc);
61	struct palmas *palmas = pg->palmas;
62	int ret;
63	unsigned int reg;
64	int gpio16 = (offset/8);
65
66	offset %= 8;
67	if (gpio16)
68		reg = (value) ?
69			PALMAS_GPIO_SET_DATA_OUT2 : PALMAS_GPIO_CLEAR_DATA_OUT2;
70	else
71		reg = (value) ?
72			PALMAS_GPIO_SET_DATA_OUT : PALMAS_GPIO_CLEAR_DATA_OUT;
73
74	ret = palmas_write(palmas, PALMAS_GPIO_BASE, reg, BIT(offset));
75	if (ret < 0)
76		dev_err(gc->parent, "Reg 0x%02x write failed, %d\n", reg, ret);
77}
78
79static int palmas_gpio_output(struct gpio_chip *gc, unsigned offset,
80				int value)
81{
82	struct palmas_gpio *pg = gpiochip_get_data(gc);
83	struct palmas *palmas = pg->palmas;
84	int ret;
85	unsigned int reg;
86	int gpio16 = (offset/8);
87
88	offset %= 8;
89	reg = (gpio16) ? PALMAS_GPIO_DATA_DIR2 : PALMAS_GPIO_DATA_DIR;
90
91	/* Set the initial value */
92	palmas_gpio_set(gc, offset, value);
93
94	ret = palmas_update_bits(palmas, PALMAS_GPIO_BASE, reg,
95				BIT(offset), BIT(offset));
96	if (ret < 0)
97		dev_err(gc->parent, "Reg 0x%02x update failed, %d\n", reg,
98			ret);
99	return ret;
100}
101
102static int palmas_gpio_input(struct gpio_chip *gc, unsigned offset)
103{
104	struct palmas_gpio *pg = gpiochip_get_data(gc);
105	struct palmas *palmas = pg->palmas;
106	int ret;
107	unsigned int reg;
108	int gpio16 = (offset/8);
109
110	offset %= 8;
111	reg = (gpio16) ? PALMAS_GPIO_DATA_DIR2 : PALMAS_GPIO_DATA_DIR;
112
113	ret = palmas_update_bits(palmas, PALMAS_GPIO_BASE, reg, BIT(offset), 0);
114	if (ret < 0)
115		dev_err(gc->parent, "Reg 0x%02x update failed, %d\n", reg,
116			ret);
117	return ret;
118}
119
120static int palmas_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
121{
122	struct palmas_gpio *pg = gpiochip_get_data(gc);
123	struct palmas *palmas = pg->palmas;
124
125	return palmas_irq_get_virq(palmas, PALMAS_GPIO_0_IRQ + offset);
126}
127
128static const struct palmas_device_data palmas_dev_data = {
129	.ngpio = 8,
130};
131
132static const struct palmas_device_data tps80036_dev_data = {
133	.ngpio = 16,
134};
135
136static const struct of_device_id of_palmas_gpio_match[] = {
137	{ .compatible = "ti,palmas-gpio", .data = &palmas_dev_data,},
138	{ .compatible = "ti,tps65913-gpio", .data = &palmas_dev_data,},
139	{ .compatible = "ti,tps65914-gpio", .data = &palmas_dev_data,},
140	{ .compatible = "ti,tps80036-gpio", .data = &tps80036_dev_data,},
141	{ },
142};
143
144static int palmas_gpio_probe(struct platform_device *pdev)
145{
146	struct palmas *palmas = dev_get_drvdata(pdev->dev.parent);
147	struct palmas_platform_data *palmas_pdata;
148	struct palmas_gpio *palmas_gpio;
149	int ret;
150	const struct palmas_device_data *dev_data;
151
152	dev_data = of_device_get_match_data(&pdev->dev);
153	if (!dev_data)
154		dev_data = &palmas_dev_data;
155
156	palmas_gpio = devm_kzalloc(&pdev->dev,
157				sizeof(*palmas_gpio), GFP_KERNEL);
158	if (!palmas_gpio)
159		return -ENOMEM;
160
161	palmas_gpio->palmas = palmas;
162	palmas_gpio->gpio_chip.owner = THIS_MODULE;
163	palmas_gpio->gpio_chip.label = dev_name(&pdev->dev);
164	palmas_gpio->gpio_chip.ngpio = dev_data->ngpio;
165	palmas_gpio->gpio_chip.can_sleep = true;
166	palmas_gpio->gpio_chip.direction_input = palmas_gpio_input;
167	palmas_gpio->gpio_chip.direction_output = palmas_gpio_output;
168	palmas_gpio->gpio_chip.to_irq = palmas_gpio_to_irq;
169	palmas_gpio->gpio_chip.set	= palmas_gpio_set;
170	palmas_gpio->gpio_chip.get	= palmas_gpio_get;
171	palmas_gpio->gpio_chip.parent = &pdev->dev;
172
173	palmas_pdata = dev_get_platdata(palmas->dev);
174	if (palmas_pdata && palmas_pdata->gpio_base)
175		palmas_gpio->gpio_chip.base = palmas_pdata->gpio_base;
176	else
177		palmas_gpio->gpio_chip.base = -1;
178
179	ret = devm_gpiochip_add_data(&pdev->dev, &palmas_gpio->gpio_chip,
180				     palmas_gpio);
181	if (ret < 0) {
182		dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
183		return ret;
184	}
185
186	return ret;
187}
188
189static struct platform_driver palmas_gpio_driver = {
190	.driver.name	= "palmas-gpio",
191	.driver.of_match_table = of_palmas_gpio_match,
192	.probe		= palmas_gpio_probe,
193};
194
195static int __init palmas_gpio_init(void)
196{
197	return platform_driver_register(&palmas_gpio_driver);
198}
199subsys_initcall(palmas_gpio_init);
200