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
174	palmas_pdata = dev_get_platdata(palmas->dev);
175	if (palmas_pdata && palmas_pdata->gpio_base)
176		palmas_gpio->gpio_chip.base = palmas_pdata->gpio_base;
177	else
178		palmas_gpio->gpio_chip.base = -1;
179
180	ret = devm_gpiochip_add_data(&pdev->dev, &palmas_gpio->gpio_chip,
181				     palmas_gpio);
182	if (ret < 0) {
183		dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
184		return ret;
185	}
186
187	platform_set_drvdata(pdev, palmas_gpio);
188	return ret;
189}
190
191static struct platform_driver palmas_gpio_driver = {
192	.driver.name	= "palmas-gpio",
193	.driver.of_match_table = of_palmas_gpio_match,
194	.probe		= palmas_gpio_probe,
195};
196
197static int __init palmas_gpio_init(void)
198{
199	return platform_driver_register(&palmas_gpio_driver);
200}
201subsys_initcall(palmas_gpio_init);