1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * slg7xl45106_i2c_gpo driver
4 *
5 * Copyright (C) 2021 Xilinx, Inc.
6 */
7
8 #include <common.h>
9 #include <errno.h>
10 #include <asm/io.h>
11 #include <asm/gpio.h>
12 #include <dm.h>
13 #include <i2c.h>
14 #include <dt-bindings/gpio/gpio.h>
15 #include <asm/arch/hardware.h>
16
17 #define SLG7XL45106_REG 0xdb
18
slg7xl45106_i2c_gpo_direction_input(struct udevice * dev,unsigned int offset)19 static int slg7xl45106_i2c_gpo_direction_input(struct udevice *dev,
20 unsigned int offset)
21 {
22 return 0;
23 }
24
slg7xl45106_i2c_gpo_xlate(struct udevice * dev,struct gpio_desc * desc,struct ofnode_phandle_args * args)25 static int slg7xl45106_i2c_gpo_xlate(struct udevice *dev,
26 struct gpio_desc *desc,
27 struct ofnode_phandle_args *args)
28 {
29 desc->offset = (unsigned int)args->args[0];
30 desc->flags = (args->args[1] & GPIO_ACTIVE_LOW ? GPIOD_ACTIVE_LOW : 0);
31
32 return 0;
33 }
34
slg7xl45106_i2c_gpo_set_value(struct udevice * dev,unsigned int offset,int value)35 static int slg7xl45106_i2c_gpo_set_value(struct udevice *dev,
36 unsigned int offset, int value)
37 {
38 int ret;
39 u8 val;
40
41 ret = dm_i2c_read(dev, SLG7XL45106_REG, &val, 1);
42 if (ret)
43 return ret;
44
45 if (value)
46 val |= BIT(offset);
47 else
48 val &= ~BIT(offset);
49
50 return dm_i2c_write(dev, SLG7XL45106_REG, &val, 1);
51 }
52
slg7xl45106_i2c_gpo_direction_output(struct udevice * dev,unsigned int offset,int value)53 static int slg7xl45106_i2c_gpo_direction_output(struct udevice *dev,
54 unsigned int offset, int value)
55 {
56 return slg7xl45106_i2c_gpo_set_value(dev, offset, value);
57 }
58
slg7xl45106_i2c_gpo_get_value(struct udevice * dev,unsigned int offset)59 static int slg7xl45106_i2c_gpo_get_value(struct udevice *dev,
60 unsigned int offset)
61 {
62 int ret;
63 u8 val;
64
65 ret = dm_i2c_read(dev, SLG7XL45106_REG, &val, 1);
66 if (ret)
67 return ret;
68
69 return !!(val & BIT(offset));
70 }
71
slg7xl45106_i2c_gpo_get_function(struct udevice * dev,unsigned int offset)72 static int slg7xl45106_i2c_gpo_get_function(struct udevice *dev,
73 unsigned int offset)
74 {
75 return GPIOF_OUTPUT;
76 }
77
78 static const struct dm_gpio_ops slg7xl45106_i2c_gpo_ops = {
79 .direction_input = slg7xl45106_i2c_gpo_direction_input,
80 .direction_output = slg7xl45106_i2c_gpo_direction_output,
81 .get_value = slg7xl45106_i2c_gpo_get_value,
82 .set_value = slg7xl45106_i2c_gpo_set_value,
83 .get_function = slg7xl45106_i2c_gpo_get_function,
84 .xlate = slg7xl45106_i2c_gpo_xlate,
85 };
86
slg7xl45106_i2c_gpo_probe(struct udevice * dev)87 static int slg7xl45106_i2c_gpo_probe(struct udevice *dev)
88 {
89 struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
90 const void *label_ptr;
91
92 label_ptr = dev_read_prop(dev, "label", NULL);
93 if (label_ptr) {
94 uc_priv->bank_name = strdup(label_ptr);
95 if (!uc_priv->bank_name)
96 return -ENOMEM;
97 } else {
98 uc_priv->bank_name = dev->name;
99 }
100
101 uc_priv->gpio_count = 8;
102
103 return 0;
104 }
105
106 static const struct udevice_id slg7xl45106_i2c_gpo_ids[] = {
107 { .compatible = "dlg,slg7xl45106",},
108 { }
109 };
110
111 U_BOOT_DRIVER(slg7xl45106_i2c_gpo) = {
112 .name = "slg7xl45106_i2c_gpo",
113 .id = UCLASS_GPIO,
114 .ops = &slg7xl45106_i2c_gpo_ops,
115 .of_match = slg7xl45106_i2c_gpo_ids,
116 .probe = slg7xl45106_i2c_gpo_probe,
117 };
118