| T Karthik Reddy | 15efe0f | 2022-02-23 16:21:30 +0100 | [diff] [blame] | 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 <asm/arch/hardware.h> |
| 15 | |
| 16 | #define SLG7XL45106_REG 0xdb |
| 17 | |
| 18 | static int slg7xl45106_i2c_gpo_direction_input(struct udevice *dev, |
| 19 | unsigned int offset) |
| 20 | { |
| 21 | return 0; |
| 22 | } |
| 23 | |
| 24 | static int slg7xl45106_i2c_gpo_xlate(struct udevice *dev, |
| 25 | struct gpio_desc *desc, |
| 26 | struct ofnode_phandle_args *args) |
| 27 | { |
| 28 | desc->offset = (unsigned int)args->args[0]; |
| 29 | |
| 30 | return 0; |
| 31 | } |
| 32 | |
| 33 | static int slg7xl45106_i2c_gpo_set_value(struct udevice *dev, |
| 34 | unsigned int offset, int value) |
| 35 | { |
| 36 | int ret; |
| 37 | u8 val; |
| 38 | |
| 39 | ret = dm_i2c_read(dev, SLG7XL45106_REG, &val, 1); |
| 40 | if (ret) |
| 41 | return ret; |
| 42 | |
| 43 | if (value) |
| 44 | val |= BIT(offset); |
| 45 | else |
| 46 | val &= ~BIT(offset); |
| 47 | |
| 48 | return dm_i2c_write(dev, SLG7XL45106_REG, &val, 1); |
| 49 | } |
| 50 | |
| 51 | static int slg7xl45106_i2c_gpo_direction_output(struct udevice *dev, |
| 52 | unsigned int offset, int value) |
| 53 | { |
| 54 | return slg7xl45106_i2c_gpo_set_value(dev, offset, value); |
| 55 | } |
| 56 | |
| 57 | static int slg7xl45106_i2c_gpo_get_value(struct udevice *dev, |
| 58 | unsigned int offset) |
| 59 | { |
| 60 | int ret; |
| 61 | u8 val; |
| 62 | |
| 63 | ret = dm_i2c_read(dev, SLG7XL45106_REG, &val, 1); |
| 64 | if (ret) |
| 65 | return ret; |
| 66 | |
| 67 | return !!(val & BIT(offset)); |
| 68 | } |
| 69 | |
| 70 | static int slg7xl45106_i2c_gpo_get_function(struct udevice *dev, |
| 71 | unsigned int offset) |
| 72 | { |
| 73 | return GPIOF_OUTPUT; |
| 74 | } |
| 75 | |
| 76 | static const struct dm_gpio_ops slg7xl45106_i2c_gpo_ops = { |
| 77 | .direction_input = slg7xl45106_i2c_gpo_direction_input, |
| 78 | .direction_output = slg7xl45106_i2c_gpo_direction_output, |
| 79 | .get_value = slg7xl45106_i2c_gpo_get_value, |
| 80 | .set_value = slg7xl45106_i2c_gpo_set_value, |
| 81 | .get_function = slg7xl45106_i2c_gpo_get_function, |
| 82 | .xlate = slg7xl45106_i2c_gpo_xlate, |
| 83 | }; |
| 84 | |
| 85 | static int slg7xl45106_i2c_gpo_probe(struct udevice *dev) |
| 86 | { |
| 87 | struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev); |
| 88 | const void *label_ptr; |
| 89 | |
| 90 | label_ptr = dev_read_prop(dev, "label", NULL); |
| 91 | if (label_ptr) { |
| 92 | uc_priv->bank_name = strdup(label_ptr); |
| 93 | if (!uc_priv->bank_name) |
| 94 | return -ENOMEM; |
| 95 | } else { |
| 96 | uc_priv->bank_name = dev->name; |
| 97 | } |
| 98 | |
| 99 | uc_priv->gpio_count = 8; |
| 100 | |
| 101 | return 0; |
| 102 | } |
| 103 | |
| 104 | static const struct udevice_id slg7xl45106_i2c_gpo_ids[] = { |
| 105 | { .compatible = "dlg,slg7xl45106",}, |
| 106 | { } |
| 107 | }; |
| 108 | |
| 109 | U_BOOT_DRIVER(slg7xl45106_i2c_gpo) = { |
| 110 | .name = "slg7xl45106_i2c_gpo", |
| 111 | .id = UCLASS_GPIO, |
| 112 | .ops = &slg7xl45106_i2c_gpo_ops, |
| 113 | .of_match = slg7xl45106_i2c_gpo_ids, |
| 114 | .probe = slg7xl45106_i2c_gpo_probe, |
| 115 | }; |