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
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 int offset,int value)39 static 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
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 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
tps65910_gpio_input(struct gpio_chip * gc,unsigned offset)69 static 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
tps65910_parse_dt_for_gpio(struct device * dev,struct tps65910 * tps65910,int chip_ngpio)79 static 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
tps65910_parse_dt_for_gpio(struct device * dev,struct tps65910 * tps65910,int chip_ngpio)102 static 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
tps65910_gpio_probe(struct platform_device * pdev)109 static 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
170 skip_init:
171 return devm_gpiochip_add_data(&pdev->dev, &tps65910_gpio->gpio_chip,
172 tps65910_gpio);
173 }
174
175 static struct platform_driver tps65910_gpio_driver = {
176 .driver.name = "tps65910-gpio",
177 .probe = tps65910_gpio_probe,
178 };
179
tps65910_gpio_init(void)180 static int __init tps65910_gpio_init(void)
181 {
182 return platform_driver_register(&tps65910_gpio_driver);
183 }
184 subsys_initcall(tps65910_gpio_init);
185