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/of_device.h>
16#include <linux/platform_device.h>
17
18struct palmas_gpio {
19	struct gpio_chip gpio_chip;
20	struct palmas *palmas;
21};
22
23struct palmas_device_data {
24	int ngpio;
25};
26
27static int palmas_gpio_get(struct gpio_chip *gc, unsigned offset)
28{
29	struct palmas_gpio *pg = gpiochip_get_data(gc);
30	struct palmas *palmas = pg->palmas;
31	unsigned int val;
32	int ret;
33	unsigned int reg;
34	int gpio16 = (offset/8);
35
36	offset %= 8;
37	reg = (gpio16) ? PALMAS_GPIO_DATA_DIR2 : PALMAS_GPIO_DATA_DIR;
38
39	ret = palmas_read(palmas, PALMAS_GPIO_BASE, reg, &val);
40	if (ret < 0) {
41		dev_err(gc->parent, "Reg 0x%02x read failed, %d\n", reg, ret);
42		return ret;
43	}
44
45	if (val & BIT(offset))
46		reg = (gpio16) ? PALMAS_GPIO_DATA_OUT2 : PALMAS_GPIO_DATA_OUT;
47	else
48		reg = (gpio16) ? PALMAS_GPIO_DATA_IN2 : PALMAS_GPIO_DATA_IN;
49
50	ret = palmas_read(palmas, PALMAS_GPIO_BASE, reg, &val);
51	if (ret < 0) {
52		dev_err(gc->parent, "Reg 0x%02x read failed, %d\n", reg, ret);
53		return ret;
54	}
55	return !!(val & BIT(offset));
56}
57
58static void palmas_gpio_set(struct gpio_chip *gc, unsigned offset,
59			int value)
60{
61	struct palmas_gpio *pg = gpiochip_get_data(gc);
62	struct palmas *palmas = pg->palmas;
63	int ret;
64	unsigned int reg;
65	int gpio16 = (offset/8);
66
67	offset %= 8;
68	if (gpio16)
69		reg = (value) ?
70			PALMAS_GPIO_SET_DATA_OUT2 : PALMAS_GPIO_CLEAR_DATA_OUT2;
71	else
72		reg = (value) ?
73			PALMAS_GPIO_SET_DATA_OUT : PALMAS_GPIO_CLEAR_DATA_OUT;
74
75	ret = palmas_write(palmas, PALMAS_GPIO_BASE, reg, BIT(offset));
76	if (ret < 0)
77		dev_err(gc->parent, "Reg 0x%02x write failed, %d\n", reg, ret);
78}
79
80static int palmas_gpio_output(struct gpio_chip *gc, unsigned offset,
81				int value)
82{
83	struct palmas_gpio *pg = gpiochip_get_data(gc);
84	struct palmas *palmas = pg->palmas;
85	int ret;
86	unsigned int reg;
87	int gpio16 = (offset/8);
88
89	offset %= 8;
90	reg = (gpio16) ? PALMAS_GPIO_DATA_DIR2 : PALMAS_GPIO_DATA_DIR;
91
92	/* Set the initial value */
93	palmas_gpio_set(gc, offset, value);
94
95	ret = palmas_update_bits(palmas, PALMAS_GPIO_BASE, reg,
96				BIT(offset), BIT(offset));
97	if (ret < 0)
98		dev_err(gc->parent, "Reg 0x%02x update failed, %d\n", reg,
99			ret);
100	return ret;
101}
102
103static int palmas_gpio_input(struct gpio_chip *gc, unsigned offset)
104{
105	struct palmas_gpio *pg = gpiochip_get_data(gc);
106	struct palmas *palmas = pg->palmas;
107	int ret;
108	unsigned int reg;
109	int gpio16 = (offset/8);
110
111	offset %= 8;
112	reg = (gpio16) ? PALMAS_GPIO_DATA_DIR2 : PALMAS_GPIO_DATA_DIR;
113
114	ret = palmas_update_bits(palmas, PALMAS_GPIO_BASE, reg, BIT(offset), 0);
115	if (ret < 0)
116		dev_err(gc->parent, "Reg 0x%02x update failed, %d\n", reg,
117			ret);
118	return ret;
119}
120
121static int palmas_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
122{
123	struct palmas_gpio *pg = gpiochip_get_data(gc);
124	struct palmas *palmas = pg->palmas;
125
126	return palmas_irq_get_virq(palmas, PALMAS_GPIO_0_IRQ + offset);
127}
128
129static const struct palmas_device_data palmas_dev_data = {
130	.ngpio = 8,
131};
132
133static const struct palmas_device_data tps80036_dev_data = {
134	.ngpio = 16,
135};
136
137static const struct of_device_id of_palmas_gpio_match[] = {
138	{ .compatible = "ti,palmas-gpio", .data = &palmas_dev_data,},
139	{ .compatible = "ti,tps65913-gpio", .data = &palmas_dev_data,},
140	{ .compatible = "ti,tps65914-gpio", .data = &palmas_dev_data,},
141	{ .compatible = "ti,tps80036-gpio", .data = &tps80036_dev_data,},
142	{ },
143};
144
145static int palmas_gpio_probe(struct platform_device *pdev)
146{
147	struct palmas *palmas = dev_get_drvdata(pdev->dev.parent);
148	struct palmas_platform_data *palmas_pdata;
149	struct palmas_gpio *palmas_gpio;
150	int ret;
151	const struct palmas_device_data *dev_data;
152
153	dev_data = of_device_get_match_data(&pdev->dev);
154	if (!dev_data)
155		dev_data = &palmas_dev_data;
156
157	palmas_gpio = devm_kzalloc(&pdev->dev,
158				sizeof(*palmas_gpio), GFP_KERNEL);
159	if (!palmas_gpio)
160		return -ENOMEM;
161
162	palmas_gpio->palmas = palmas;
163	palmas_gpio->gpio_chip.owner = THIS_MODULE;
164	palmas_gpio->gpio_chip.label = dev_name(&pdev->dev);
165	palmas_gpio->gpio_chip.ngpio = dev_data->ngpio;
166	palmas_gpio->gpio_chip.can_sleep = true;
167	palmas_gpio->gpio_chip.direction_input = palmas_gpio_input;
168	palmas_gpio->gpio_chip.direction_output = palmas_gpio_output;
169	palmas_gpio->gpio_chip.to_irq = palmas_gpio_to_irq;
170	palmas_gpio->gpio_chip.set	= palmas_gpio_set;
171	palmas_gpio->gpio_chip.get	= palmas_gpio_get;
172	palmas_gpio->gpio_chip.parent = &pdev->dev;
173#ifdef CONFIG_OF_GPIO
174	palmas_gpio->gpio_chip.of_node = pdev->dev.of_node;
175#endif
176	palmas_pdata = dev_get_platdata(palmas->dev);
177	if (palmas_pdata && palmas_pdata->gpio_base)
178		palmas_gpio->gpio_chip.base = palmas_pdata->gpio_base;
179	else
180		palmas_gpio->gpio_chip.base = -1;
181
182	ret = devm_gpiochip_add_data(&pdev->dev, &palmas_gpio->gpio_chip,
183				     palmas_gpio);
184	if (ret < 0) {
185		dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
186		return ret;
187	}
188
189	platform_set_drvdata(pdev, palmas_gpio);
190	return ret;
191}
192
193static struct platform_driver palmas_gpio_driver = {
194	.driver.name	= "palmas-gpio",
195	.driver.of_match_table = of_palmas_gpio_match,
196	.probe		= palmas_gpio_probe,
197};
198
199static int __init palmas_gpio_init(void)
200{
201	return platform_driver_register(&palmas_gpio_driver);
202}
203subsys_initcall(palmas_gpio_init);
204