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_device.h>
19 
20 struct tps65910_gpio {
21 	struct gpio_chip gpio_chip;
22 	struct tps65910 *tps65910;
23 };
24 
tps65910_gpio_get(struct gpio_chip * gc,unsigned offset)25 static 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 
tps65910_gpio_set(struct gpio_chip * gc,unsigned offset,int value)39 static 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 
tps65910_gpio_output(struct gpio_chip * gc,unsigned offset,int value)53 static 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 
tps65910_gpio_input(struct gpio_chip * gc,unsigned offset)66 static 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
tps65910_parse_dt_for_gpio(struct device * dev,struct tps65910 * tps65910,int chip_ngpio)76 static 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
tps65910_parse_dt_for_gpio(struct device * dev,struct tps65910 * tps65910,int chip_ngpio)99 static 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 
tps65910_gpio_probe(struct platform_device * pdev)106 static 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 	tps65910_gpio = devm_kzalloc(&pdev->dev,
115 				sizeof(*tps65910_gpio), GFP_KERNEL);
116 	if (!tps65910_gpio)
117 		return -ENOMEM;
118 
119 	tps65910_gpio->tps65910 = tps65910;
120 
121 	tps65910_gpio->gpio_chip.owner = THIS_MODULE;
122 	tps65910_gpio->gpio_chip.label = tps65910->i2c_client->name;
123 
124 	switch (tps65910_chip_id(tps65910)) {
125 	case TPS65910:
126 		tps65910_gpio->gpio_chip.ngpio = TPS65910_NUM_GPIO;
127 		break;
128 	case TPS65911:
129 		tps65910_gpio->gpio_chip.ngpio = TPS65911_NUM_GPIO;
130 		break;
131 	default:
132 		return -EINVAL;
133 	}
134 	tps65910_gpio->gpio_chip.can_sleep = true;
135 	tps65910_gpio->gpio_chip.direction_input = tps65910_gpio_input;
136 	tps65910_gpio->gpio_chip.direction_output = tps65910_gpio_output;
137 	tps65910_gpio->gpio_chip.set	= tps65910_gpio_set;
138 	tps65910_gpio->gpio_chip.get	= tps65910_gpio_get;
139 	tps65910_gpio->gpio_chip.parent = &pdev->dev;
140 #ifdef CONFIG_OF_GPIO
141 	tps65910_gpio->gpio_chip.of_node = tps65910->dev->of_node;
142 #endif
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 
167 skip_init:
168 	return devm_gpiochip_add_data(&pdev->dev, &tps65910_gpio->gpio_chip,
169 				      tps65910_gpio);
170 }
171 
172 static struct platform_driver tps65910_gpio_driver = {
173 	.driver.name    = "tps65910-gpio",
174 	.probe		= tps65910_gpio_probe,
175 };
176 
tps65910_gpio_init(void)177 static int __init tps65910_gpio_init(void)
178 {
179 	return platform_driver_register(&tps65910_gpio_driver);
180 }
181 subsys_initcall(tps65910_gpio_init);
182