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1 | // SPDX-License-Identifier: GPL-2.0-or-later |
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2 | /* |
3 | * Copyright 2009-2012 Freescale Semiconductor, Inc. All Rights Reserved. |
4 | * |
5 | * Author: Wu Guoxing <b39297@freescale.com> |
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6 | */ |
7 | |
8 | #include <linux/kernel.h> |
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9 | #include <linux/init.h> |
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10 | #include <linux/slab.h> |
11 | #include <linux/i2c.h> |
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12 | #include <linux/gpio/driver.h> |
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13 | |
14 | #define GPIO_GROUP_NUM 2 |
15 | #define GPIO_NUM_PER_GROUP 8 |
16 | #define GPIO_NUM (GPIO_GROUP_NUM*GPIO_NUM_PER_GROUP) |
17 | |
18 | struct mc9s08dz60 { |
19 | struct i2c_client *client; |
20 | struct gpio_chip chip; |
21 | }; |
22 | |
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23 | static void mc9s_gpio_to_reg_and_bit(int offset, u8 *reg, u8 *bit) |
24 | { |
25 | *reg = 0x20 + offset / GPIO_NUM_PER_GROUP; |
26 | *bit = offset % GPIO_NUM_PER_GROUP; |
27 | } |
28 | |
29 | static int mc9s08dz60_get_value(struct gpio_chip *gc, unsigned offset) |
30 | { |
31 | u8 reg, bit; |
32 | s32 value; |
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33 | struct mc9s08dz60 *mc9s = gpiochip_get_data(gc); |
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34 | |
35 | mc9s_gpio_to_reg_and_bit(offset, ®, &bit); |
36 | value = i2c_smbus_read_byte_data(mc9s->client, reg); |
37 | |
38 | return (value >= 0) ? (value >> bit) & 0x1 : 0; |
39 | } |
40 | |
41 | static int mc9s08dz60_set(struct mc9s08dz60 *mc9s, unsigned offset, int val) |
42 | { |
43 | u8 reg, bit; |
44 | s32 value; |
45 | |
46 | mc9s_gpio_to_reg_and_bit(offset, ®, &bit); |
47 | value = i2c_smbus_read_byte_data(mc9s->client, reg); |
48 | if (value >= 0) { |
49 | if (val) |
50 | value |= 1 << bit; |
51 | else |
52 | value &= ~(1 << bit); |
53 | |
54 | return i2c_smbus_write_byte_data(mc9s->client, reg, value); |
55 | } else |
56 | return value; |
57 | |
58 | } |
59 | |
60 | |
61 | static void mc9s08dz60_set_value(struct gpio_chip *gc, unsigned offset, int val) |
62 | { |
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63 | struct mc9s08dz60 *mc9s = gpiochip_get_data(gc); |
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64 | |
65 | mc9s08dz60_set(mc9s, offset, val); |
66 | } |
67 | |
68 | static int mc9s08dz60_direction_output(struct gpio_chip *gc, |
69 | unsigned offset, int val) |
70 | { |
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71 | struct mc9s08dz60 *mc9s = gpiochip_get_data(gc); |
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72 | |
73 | return mc9s08dz60_set(mc9s, offset, val); |
74 | } |
75 | |
76 | static int mc9s08dz60_probe(struct i2c_client *client, |
77 | const struct i2c_device_id *id) |
78 | { |
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79 | struct mc9s08dz60 *mc9s; |
80 | |
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81 | mc9s = devm_kzalloc(&client->dev, sizeof(*mc9s), GFP_KERNEL); |
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82 | if (!mc9s) |
83 | return -ENOMEM; |
84 | |
85 | mc9s->chip.label = client->name; |
86 | mc9s->chip.base = -1; |
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87 | mc9s->chip.parent = &client->dev; |
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88 | mc9s->chip.owner = THIS_MODULE; |
89 | mc9s->chip.ngpio = GPIO_NUM; |
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90 | mc9s->chip.can_sleep = true; |
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91 | mc9s->chip.get = mc9s08dz60_get_value; |
92 | mc9s->chip.set = mc9s08dz60_set_value; |
93 | mc9s->chip.direction_output = mc9s08dz60_direction_output; |
94 | mc9s->client = client; |
95 | i2c_set_clientdata(client, mc9s); |
96 | |
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97 | return devm_gpiochip_add_data(&client->dev, &mc9s->chip, mc9s); |
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98 | } |
99 | |
100 | static const struct i2c_device_id mc9s08dz60_id[] = { |
101 | {"mc9s08dz60", 0}, |
102 | {}, |
103 | }; |
104 | |
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105 | static struct i2c_driver mc9s08dz60_i2c_driver = { |
106 | .driver = { |
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107 | .name = "mc9s08dz60", |
108 | }, |
109 | .probe = mc9s08dz60_probe, |
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110 | .id_table = mc9s08dz60_id, |
111 | }; |
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112 | builtin_i2c_driver(mc9s08dz60_i2c_driver); |