gpio-tps65910.c

  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 int tps65910_gpio_set(struct gpio_chip *gc, unsigned int 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		return regmap_set_bits(tps65910->regmap,
 47				       TPS65910_GPIO0 + offset, GPIO_SET_MASK);
 48
 49	return 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	int ret;
 59
 60	/* Set the initial value */
 61	ret = tps65910_gpio_set(gc, offset, value);
 62	if (ret)
 63		return ret;
 64
 65	return regmap_set_bits(tps65910->regmap, TPS65910_GPIO0 + offset,
 66						GPIO_CFG_MASK);
 67}
 68
 69static int tps65910_gpio_input(struct gpio_chip *gc, unsigned offset)
 70{
 71	struct tps65910_gpio *tps65910_gpio = gpiochip_get_data(gc);
 72	struct tps65910 *tps65910 = tps65910_gpio->tps65910;
 73
 74	return regmap_clear_bits(tps65910->regmap, TPS65910_GPIO0 + offset,
 75						GPIO_CFG_MASK);
 76}
 77
 78#ifdef CONFIG_OF
 79static struct tps65910_board *tps65910_parse_dt_for_gpio(struct device *dev,
 80		struct tps65910 *tps65910, int chip_ngpio)
 81{
 82	struct tps65910_board *tps65910_board = tps65910->of_plat_data;
 83	unsigned int prop_array[TPS6591X_MAX_NUM_GPIO];
 84	int ngpio = min(chip_ngpio, TPS6591X_MAX_NUM_GPIO);
 85	int ret;
 86	int idx;
 87
 88	tps65910_board->gpio_base = -1;
 89	ret = of_property_read_u32_array(tps65910->dev->of_node,
 90			"ti,en-gpio-sleep", prop_array, ngpio);
 91	if (ret < 0) {
 92		dev_dbg(dev, "ti,en-gpio-sleep not specified\n");
 93		return tps65910_board;
 94	}
 95
 96	for (idx = 0; idx < ngpio; idx++)
 97		tps65910_board->en_gpio_sleep[idx] = (prop_array[idx] != 0);
 98
 99	return tps65910_board;
100}
101#else
102static struct tps65910_board *tps65910_parse_dt_for_gpio(struct device *dev,
103		struct tps65910 *tps65910, int chip_ngpio)
104{
105	return NULL;
106}
107#endif
108
109static int tps65910_gpio_probe(struct platform_device *pdev)
110{
111	struct tps65910 *tps65910 = dev_get_drvdata(pdev->dev.parent);
112	struct tps65910_board *pdata = dev_get_platdata(tps65910->dev);
113	struct tps65910_gpio *tps65910_gpio;
114	int ret;
115	int i;
116
117	device_set_node(&pdev->dev, dev_fwnode(pdev->dev.parent));
118
119	tps65910_gpio = devm_kzalloc(&pdev->dev,
120				sizeof(*tps65910_gpio), GFP_KERNEL);
121	if (!tps65910_gpio)
122		return -ENOMEM;
123
124	tps65910_gpio->tps65910 = tps65910;
125
126	tps65910_gpio->gpio_chip.owner = THIS_MODULE;
127	tps65910_gpio->gpio_chip.label = tps65910->i2c_client->name;
128
129	switch (tps65910_chip_id(tps65910)) {
130	case TPS65910:
131		tps65910_gpio->gpio_chip.ngpio = TPS65910_NUM_GPIO;
132		break;
133	case TPS65911:
134		tps65910_gpio->gpio_chip.ngpio = TPS65911_NUM_GPIO;
135		break;
136	default:
137		return -EINVAL;
138	}
139	tps65910_gpio->gpio_chip.can_sleep = true;
140	tps65910_gpio->gpio_chip.direction_input = tps65910_gpio_input;
141	tps65910_gpio->gpio_chip.direction_output = tps65910_gpio_output;
142	tps65910_gpio->gpio_chip.set	= tps65910_gpio_set;
143	tps65910_gpio->gpio_chip.get	= tps65910_gpio_get;
144	tps65910_gpio->gpio_chip.parent = &pdev->dev;
145
146	if (pdata && pdata->gpio_base)
147		tps65910_gpio->gpio_chip.base = pdata->gpio_base;
148	else
149		tps65910_gpio->gpio_chip.base = -1;
150
151	if (!pdata && tps65910->dev->of_node)
152		pdata = tps65910_parse_dt_for_gpio(&pdev->dev, tps65910,
153			tps65910_gpio->gpio_chip.ngpio);
154
155	if (!pdata)
156		goto skip_init;
157
158	/* Configure sleep control for gpios if provided */
159	for (i = 0; i < tps65910_gpio->gpio_chip.ngpio; ++i) {
160		if (!pdata->en_gpio_sleep[i])
161			continue;
162
163		ret = regmap_set_bits(tps65910->regmap,
164			TPS65910_GPIO0 + i, GPIO_SLEEP_MASK);
165		if (ret < 0)
166			dev_warn(tps65910->dev,
167				"GPIO Sleep setting failed with err %d\n", ret);
168	}
169
170skip_init:
171	return devm_gpiochip_add_data(&pdev->dev, &tps65910_gpio->gpio_chip,
172				      tps65910_gpio);
173}
174
175static struct platform_driver tps65910_gpio_driver = {
176	.driver.name    = "tps65910-gpio",
177	.probe		= tps65910_gpio_probe,
178};
179
180static int __init tps65910_gpio_init(void)
181{
182	return platform_driver_register(&tps65910_gpio_driver);
183}
184subsys_initcall(tps65910_gpio_init);