GNU Linux-libre 5.19-rc6-gnu
[releases.git] / drivers / gpio / 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_device.h>
19
20 struct tps65910_gpio {
21         struct gpio_chip gpio_chip;
22         struct tps65910 *tps65910;
23 };
24
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
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
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
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
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
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
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         device_set_node(&pdev->dev, dev_fwnode(pdev->dev.parent));
115
116         tps65910_gpio = devm_kzalloc(&pdev->dev,
117                                 sizeof(*tps65910_gpio), GFP_KERNEL);
118         if (!tps65910_gpio)
119                 return -ENOMEM;
120
121         tps65910_gpio->tps65910 = tps65910;
122
123         tps65910_gpio->gpio_chip.owner = THIS_MODULE;
124         tps65910_gpio->gpio_chip.label = tps65910->i2c_client->name;
125
126         switch (tps65910_chip_id(tps65910)) {
127         case TPS65910:
128                 tps65910_gpio->gpio_chip.ngpio = TPS65910_NUM_GPIO;
129                 break;
130         case TPS65911:
131                 tps65910_gpio->gpio_chip.ngpio = TPS65911_NUM_GPIO;
132                 break;
133         default:
134                 return -EINVAL;
135         }
136         tps65910_gpio->gpio_chip.can_sleep = true;
137         tps65910_gpio->gpio_chip.direction_input = tps65910_gpio_input;
138         tps65910_gpio->gpio_chip.direction_output = tps65910_gpio_output;
139         tps65910_gpio->gpio_chip.set    = tps65910_gpio_set;
140         tps65910_gpio->gpio_chip.get    = tps65910_gpio_get;
141         tps65910_gpio->gpio_chip.parent = &pdev->dev;
142
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
177 static int __init tps65910_gpio_init(void)
178 {
179         return platform_driver_register(&tps65910_gpio_driver);
180 }
181 subsys_initcall(tps65910_gpio_init);