xref: /openbmc/linux/drivers/gpio/gpio-tps65910.c (revision 82e6fdd6)
1 /*
2  * TI TPS6591x GPIO driver
3  *
4  * Copyright 2010 Texas Instruments Inc.
5  *
6  * Author: Graeme Gregory <gg@slimlogic.co.uk>
7  * Author: Jorge Eduardo Candelaria <jedu@slimlogic.co.uk>
8  *
9  *  This program is free software; you can redistribute it and/or modify it
10  *  under  the terms of the GNU General  Public License as published by the
11  *  Free Software Foundation;  either version 2 of the License, or (at your
12  *  option) any later version.
13  *
14  */
15 
16 #include <linux/kernel.h>
17 #include <linux/init.h>
18 #include <linux/errno.h>
19 #include <linux/gpio.h>
20 #include <linux/i2c.h>
21 #include <linux/platform_device.h>
22 #include <linux/mfd/tps65910.h>
23 #include <linux/of_device.h>
24 
25 struct tps65910_gpio {
26 	struct gpio_chip gpio_chip;
27 	struct tps65910 *tps65910;
28 };
29 
30 static int tps65910_gpio_get(struct gpio_chip *gc, unsigned offset)
31 {
32 	struct tps65910_gpio *tps65910_gpio = gpiochip_get_data(gc);
33 	struct tps65910 *tps65910 = tps65910_gpio->tps65910;
34 	unsigned int val;
35 
36 	tps65910_reg_read(tps65910, TPS65910_GPIO0 + offset, &val);
37 
38 	if (val & GPIO_STS_MASK)
39 		return 1;
40 
41 	return 0;
42 }
43 
44 static void tps65910_gpio_set(struct gpio_chip *gc, unsigned offset,
45 			      int value)
46 {
47 	struct tps65910_gpio *tps65910_gpio = gpiochip_get_data(gc);
48 	struct tps65910 *tps65910 = tps65910_gpio->tps65910;
49 
50 	if (value)
51 		tps65910_reg_set_bits(tps65910, TPS65910_GPIO0 + offset,
52 						GPIO_SET_MASK);
53 	else
54 		tps65910_reg_clear_bits(tps65910, TPS65910_GPIO0 + offset,
55 						GPIO_SET_MASK);
56 }
57 
58 static int tps65910_gpio_output(struct gpio_chip *gc, unsigned offset,
59 				int value)
60 {
61 	struct tps65910_gpio *tps65910_gpio = gpiochip_get_data(gc);
62 	struct tps65910 *tps65910 = tps65910_gpio->tps65910;
63 
64 	/* Set the initial value */
65 	tps65910_gpio_set(gc, offset, value);
66 
67 	return tps65910_reg_set_bits(tps65910, TPS65910_GPIO0 + offset,
68 						GPIO_CFG_MASK);
69 }
70 
71 static int tps65910_gpio_input(struct gpio_chip *gc, unsigned offset)
72 {
73 	struct tps65910_gpio *tps65910_gpio = gpiochip_get_data(gc);
74 	struct tps65910 *tps65910 = tps65910_gpio->tps65910;
75 
76 	return tps65910_reg_clear_bits(tps65910, TPS65910_GPIO0 + offset,
77 						GPIO_CFG_MASK);
78 }
79 
80 #ifdef CONFIG_OF
81 static struct tps65910_board *tps65910_parse_dt_for_gpio(struct device *dev,
82 		struct tps65910 *tps65910, int chip_ngpio)
83 {
84 	struct tps65910_board *tps65910_board = tps65910->of_plat_data;
85 	unsigned int prop_array[TPS6591X_MAX_NUM_GPIO];
86 	int ngpio = min(chip_ngpio, TPS6591X_MAX_NUM_GPIO);
87 	int ret;
88 	int idx;
89 
90 	tps65910_board->gpio_base = -1;
91 	ret = of_property_read_u32_array(tps65910->dev->of_node,
92 			"ti,en-gpio-sleep", prop_array, ngpio);
93 	if (ret < 0) {
94 		dev_dbg(dev, "ti,en-gpio-sleep not specified\n");
95 		return tps65910_board;
96 	}
97 
98 	for (idx = 0; idx < ngpio; idx++)
99 		tps65910_board->en_gpio_sleep[idx] = (prop_array[idx] != 0);
100 
101 	return tps65910_board;
102 }
103 #else
104 static struct tps65910_board *tps65910_parse_dt_for_gpio(struct device *dev,
105 		struct tps65910 *tps65910, int chip_ngpio)
106 {
107 	return NULL;
108 }
109 #endif
110 
111 static int tps65910_gpio_probe(struct platform_device *pdev)
112 {
113 	struct tps65910 *tps65910 = dev_get_drvdata(pdev->dev.parent);
114 	struct tps65910_board *pdata = dev_get_platdata(tps65910->dev);
115 	struct tps65910_gpio *tps65910_gpio;
116 	int ret;
117 	int i;
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 #ifdef CONFIG_OF_GPIO
146 	tps65910_gpio->gpio_chip.of_node = tps65910->dev->of_node;
147 #endif
148 	if (pdata && pdata->gpio_base)
149 		tps65910_gpio->gpio_chip.base = pdata->gpio_base;
150 	else
151 		tps65910_gpio->gpio_chip.base = -1;
152 
153 	if (!pdata && tps65910->dev->of_node)
154 		pdata = tps65910_parse_dt_for_gpio(&pdev->dev, tps65910,
155 			tps65910_gpio->gpio_chip.ngpio);
156 
157 	if (!pdata)
158 		goto skip_init;
159 
160 	/* Configure sleep control for gpios if provided */
161 	for (i = 0; i < tps65910_gpio->gpio_chip.ngpio; ++i) {
162 		if (!pdata->en_gpio_sleep[i])
163 			continue;
164 
165 		ret = tps65910_reg_set_bits(tps65910,
166 			TPS65910_GPIO0 + i, GPIO_SLEEP_MASK);
167 		if (ret < 0)
168 			dev_warn(tps65910->dev,
169 				"GPIO Sleep setting failed with err %d\n", ret);
170 	}
171 
172 skip_init:
173 	ret = devm_gpiochip_add_data(&pdev->dev, &tps65910_gpio->gpio_chip,
174 				     tps65910_gpio);
175 	if (ret < 0) {
176 		dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
177 		return ret;
178 	}
179 
180 	platform_set_drvdata(pdev, tps65910_gpio);
181 
182 	return ret;
183 }
184 
185 static struct platform_driver tps65910_gpio_driver = {
186 	.driver.name    = "tps65910-gpio",
187 	.probe		= tps65910_gpio_probe,
188 };
189 
190 static int __init tps65910_gpio_init(void)
191 {
192 	return platform_driver_register(&tps65910_gpio_driver);
193 }
194 subsys_initcall(tps65910_gpio_init);
195