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b866526d AD |
1 | /* |
2 | * Copyright (C) 2015 Texas Instruments Incorporated - http://www.ti.com/ | |
3 | * Andrew F. Davis <afd@ti.com> | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or | |
6 | * modify it under the terms of the GNU General Public License version 2 as | |
7 | * published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed "as is" WITHOUT ANY WARRANTY of any | |
10 | * kind, whether expressed or implied; without even the implied warranty | |
11 | * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License version 2 for more details. | |
13 | */ | |
14 | ||
15 | #include <linux/gpio/driver.h> | |
16 | #include <linux/i2c.h> | |
17 | #include <linux/module.h> | |
18 | #include <linux/mutex.h> | |
19 | ||
20 | #define TPIC2810_WS_COMMAND 0x44 | |
21 | ||
22 | /** | |
23 | * struct tpic2810 - GPIO driver data | |
24 | * @chip: GPIO controller chip | |
25 | * @client: I2C device pointer | |
26 | * @buffer: Buffer for device register | |
27 | * @lock: Protects write sequences | |
28 | */ | |
29 | struct tpic2810 { | |
30 | struct gpio_chip chip; | |
31 | struct i2c_client *client; | |
32 | u8 buffer; | |
33 | struct mutex lock; | |
34 | }; | |
35 | ||
ce02d18f AL |
36 | static void tpic2810_set(struct gpio_chip *chip, unsigned offset, int value); |
37 | ||
b866526d AD |
38 | static int tpic2810_get_direction(struct gpio_chip *chip, |
39 | unsigned offset) | |
40 | { | |
41 | /* This device always output */ | |
42 | return 0; | |
43 | } | |
44 | ||
45 | static int tpic2810_direction_input(struct gpio_chip *chip, | |
46 | unsigned offset) | |
47 | { | |
48 | /* This device is output only */ | |
49 | return -EINVAL; | |
50 | } | |
51 | ||
52 | static int tpic2810_direction_output(struct gpio_chip *chip, | |
53 | unsigned offset, int value) | |
54 | { | |
55 | /* This device always output */ | |
ce02d18f | 56 | tpic2810_set(chip, offset, value); |
b866526d AD |
57 | return 0; |
58 | } | |
59 | ||
60 | static void tpic2810_set(struct gpio_chip *chip, unsigned offset, int value) | |
61 | { | |
62 | struct tpic2810 *gpio = gpiochip_get_data(chip); | |
63 | ||
64 | mutex_lock(&gpio->lock); | |
65 | ||
66 | if (value) | |
67 | gpio->buffer |= BIT(offset); | |
68 | else | |
69 | gpio->buffer &= ~BIT(offset); | |
70 | ||
71 | i2c_smbus_write_byte_data(gpio->client, TPIC2810_WS_COMMAND, | |
72 | gpio->buffer); | |
73 | ||
74 | mutex_unlock(&gpio->lock); | |
75 | } | |
76 | ||
77 | static void tpic2810_set_multiple(struct gpio_chip *chip, unsigned long *mask, | |
78 | unsigned long *bits) | |
79 | { | |
80 | struct tpic2810 *gpio = gpiochip_get_data(chip); | |
81 | ||
82 | mutex_lock(&gpio->lock); | |
83 | ||
84 | /* clear bits under mask */ | |
85 | gpio->buffer &= ~(*mask); | |
86 | /* set bits under mask */ | |
87 | gpio->buffer |= ((*mask) & (*bits)); | |
88 | ||
89 | i2c_smbus_write_byte_data(gpio->client, TPIC2810_WS_COMMAND, | |
90 | gpio->buffer); | |
91 | ||
92 | mutex_unlock(&gpio->lock); | |
93 | } | |
94 | ||
95 | static struct gpio_chip template_chip = { | |
96 | .label = "tpic2810", | |
97 | .owner = THIS_MODULE, | |
98 | .get_direction = tpic2810_get_direction, | |
99 | .direction_input = tpic2810_direction_input, | |
100 | .direction_output = tpic2810_direction_output, | |
101 | .set = tpic2810_set, | |
102 | .set_multiple = tpic2810_set_multiple, | |
103 | .base = -1, | |
104 | .ngpio = 8, | |
105 | .can_sleep = true, | |
106 | }; | |
107 | ||
108 | static const struct of_device_id tpic2810_of_match_table[] = { | |
109 | { .compatible = "ti,tpic2810" }, | |
110 | { /* sentinel */ } | |
111 | }; | |
112 | MODULE_DEVICE_TABLE(of, tpic2810_of_match_table); | |
113 | ||
114 | static int tpic2810_probe(struct i2c_client *client, | |
115 | const struct i2c_device_id *id) | |
116 | { | |
117 | struct tpic2810 *gpio; | |
118 | int ret; | |
119 | ||
120 | gpio = devm_kzalloc(&client->dev, sizeof(*gpio), GFP_KERNEL); | |
121 | if (!gpio) | |
122 | return -ENOMEM; | |
123 | ||
124 | i2c_set_clientdata(client, gpio); | |
125 | ||
126 | gpio->chip = template_chip; | |
127 | gpio->chip.parent = &client->dev; | |
128 | ||
129 | gpio->client = client; | |
130 | ||
131 | mutex_init(&gpio->lock); | |
132 | ||
133 | ret = gpiochip_add_data(&gpio->chip, gpio); | |
134 | if (ret < 0) { | |
135 | dev_err(&client->dev, "Unable to register gpiochip\n"); | |
136 | return ret; | |
137 | } | |
138 | ||
139 | return 0; | |
140 | } | |
141 | ||
142 | static int tpic2810_remove(struct i2c_client *client) | |
143 | { | |
144 | struct tpic2810 *gpio = i2c_get_clientdata(client); | |
145 | ||
146 | gpiochip_remove(&gpio->chip); | |
147 | ||
148 | return 0; | |
149 | } | |
150 | ||
151 | static const struct i2c_device_id tpic2810_id_table[] = { | |
152 | { "tpic2810", }, | |
153 | { /* sentinel */ } | |
154 | }; | |
155 | MODULE_DEVICE_TABLE(i2c, tpic2810_id_table); | |
156 | ||
157 | static struct i2c_driver tpic2810_driver = { | |
158 | .driver = { | |
159 | .name = "tpic2810", | |
160 | .of_match_table = tpic2810_of_match_table, | |
161 | }, | |
162 | .probe = tpic2810_probe, | |
163 | .remove = tpic2810_remove, | |
164 | .id_table = tpic2810_id_table, | |
165 | }; | |
166 | module_i2c_driver(tpic2810_driver); | |
167 | ||
168 | MODULE_AUTHOR("Andrew F. Davis <afd@ti.com>"); | |
169 | MODULE_DESCRIPTION("TPIC2810 8-Bit LED Driver GPIO Driver"); | |
170 | MODULE_LICENSE("GPL v2"); |