1abd46274SThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only
2b866526dSAndrew F. Davis /*
32148a7acSAndrew Davis * Copyright (C) 2015-2023 Texas Instruments Incorporated - https://www.ti.com/
42148a7acSAndrew Davis * Andrew Davis <afd@ti.com>
5b866526dSAndrew F. Davis */
6b866526dSAndrew F. Davis
7b866526dSAndrew F. Davis #include <linux/gpio/driver.h>
8b866526dSAndrew F. Davis #include <linux/i2c.h>
9b866526dSAndrew F. Davis #include <linux/module.h>
10b866526dSAndrew F. Davis #include <linux/mutex.h>
11b866526dSAndrew F. Davis
12b866526dSAndrew F. Davis #define TPIC2810_WS_COMMAND 0x44
13b866526dSAndrew F. Davis
14b866526dSAndrew F. Davis /**
15b866526dSAndrew F. Davis * struct tpic2810 - GPIO driver data
16b866526dSAndrew F. Davis * @chip: GPIO controller chip
17b866526dSAndrew F. Davis * @client: I2C device pointer
18b866526dSAndrew F. Davis * @buffer: Buffer for device register
19b866526dSAndrew F. Davis * @lock: Protects write sequences
20b866526dSAndrew F. Davis */
21b866526dSAndrew F. Davis struct tpic2810 {
22b866526dSAndrew F. Davis struct gpio_chip chip;
23b866526dSAndrew F. Davis struct i2c_client *client;
24b866526dSAndrew F. Davis u8 buffer;
25b866526dSAndrew F. Davis struct mutex lock;
26b866526dSAndrew F. Davis };
27b866526dSAndrew F. Davis
28ce02d18fSAxel Lin static void tpic2810_set(struct gpio_chip *chip, unsigned offset, int value);
29ce02d18fSAxel Lin
tpic2810_get_direction(struct gpio_chip * chip,unsigned offset)30b866526dSAndrew F. Davis static int tpic2810_get_direction(struct gpio_chip *chip,
31b866526dSAndrew F. Davis unsigned offset)
32b866526dSAndrew F. Davis {
33b866526dSAndrew F. Davis /* This device always output */
34e42615ecSMatti Vaittinen return GPIO_LINE_DIRECTION_OUT;
35b866526dSAndrew F. Davis }
36b866526dSAndrew F. Davis
tpic2810_direction_input(struct gpio_chip * chip,unsigned offset)37b866526dSAndrew F. Davis static int tpic2810_direction_input(struct gpio_chip *chip,
38b866526dSAndrew F. Davis unsigned offset)
39b866526dSAndrew F. Davis {
40b866526dSAndrew F. Davis /* This device is output only */
41b866526dSAndrew F. Davis return -EINVAL;
42b866526dSAndrew F. Davis }
43b866526dSAndrew F. Davis
tpic2810_direction_output(struct gpio_chip * chip,unsigned offset,int value)44b866526dSAndrew F. Davis static int tpic2810_direction_output(struct gpio_chip *chip,
45b866526dSAndrew F. Davis unsigned offset, int value)
46b866526dSAndrew F. Davis {
47b866526dSAndrew F. Davis /* This device always output */
48ce02d18fSAxel Lin tpic2810_set(chip, offset, value);
49b866526dSAndrew F. Davis return 0;
50b866526dSAndrew F. Davis }
51b866526dSAndrew F. Davis
tpic2810_set_mask_bits(struct gpio_chip * chip,u8 mask,u8 bits)526e66a659SAxel Lin static void tpic2810_set_mask_bits(struct gpio_chip *chip, u8 mask, u8 bits)
53b866526dSAndrew F. Davis {
54b866526dSAndrew F. Davis struct tpic2810 *gpio = gpiochip_get_data(chip);
556e66a659SAxel Lin u8 buffer;
566e66a659SAxel Lin int err;
57b866526dSAndrew F. Davis
58b866526dSAndrew F. Davis mutex_lock(&gpio->lock);
59b866526dSAndrew F. Davis
606e66a659SAxel Lin buffer = gpio->buffer & ~mask;
616e66a659SAxel Lin buffer |= (mask & bits);
62b866526dSAndrew F. Davis
636e66a659SAxel Lin err = i2c_smbus_write_byte_data(gpio->client, TPIC2810_WS_COMMAND,
646e66a659SAxel Lin buffer);
656e66a659SAxel Lin if (!err)
666e66a659SAxel Lin gpio->buffer = buffer;
67b866526dSAndrew F. Davis
68b866526dSAndrew F. Davis mutex_unlock(&gpio->lock);
69b866526dSAndrew F. Davis }
70b866526dSAndrew F. Davis
tpic2810_set(struct gpio_chip * chip,unsigned offset,int value)716e66a659SAxel Lin static void tpic2810_set(struct gpio_chip *chip, unsigned offset, int value)
726e66a659SAxel Lin {
736e66a659SAxel Lin tpic2810_set_mask_bits(chip, BIT(offset), value ? BIT(offset) : 0);
746e66a659SAxel Lin }
756e66a659SAxel Lin
tpic2810_set_multiple(struct gpio_chip * chip,unsigned long * mask,unsigned long * bits)76b866526dSAndrew F. Davis static void tpic2810_set_multiple(struct gpio_chip *chip, unsigned long *mask,
77b866526dSAndrew F. Davis unsigned long *bits)
78b866526dSAndrew F. Davis {
796e66a659SAxel Lin tpic2810_set_mask_bits(chip, *mask, *bits);
80b866526dSAndrew F. Davis }
81b866526dSAndrew F. Davis
82e35b5ab0SJulia Lawall static const struct gpio_chip template_chip = {
83b866526dSAndrew F. Davis .label = "tpic2810",
84b866526dSAndrew F. Davis .owner = THIS_MODULE,
85b866526dSAndrew F. Davis .get_direction = tpic2810_get_direction,
86b866526dSAndrew F. Davis .direction_input = tpic2810_direction_input,
87b866526dSAndrew F. Davis .direction_output = tpic2810_direction_output,
88b866526dSAndrew F. Davis .set = tpic2810_set,
89b866526dSAndrew F. Davis .set_multiple = tpic2810_set_multiple,
90b866526dSAndrew F. Davis .base = -1,
91b866526dSAndrew F. Davis .ngpio = 8,
92b866526dSAndrew F. Davis .can_sleep = true,
93b866526dSAndrew F. Davis };
94b866526dSAndrew F. Davis
95b866526dSAndrew F. Davis static const struct of_device_id tpic2810_of_match_table[] = {
96b866526dSAndrew F. Davis { .compatible = "ti,tpic2810" },
97b866526dSAndrew F. Davis { /* sentinel */ }
98b866526dSAndrew F. Davis };
99b866526dSAndrew F. Davis MODULE_DEVICE_TABLE(of, tpic2810_of_match_table);
100b866526dSAndrew F. Davis
tpic2810_probe(struct i2c_client * client)101bf08ce13SStephen Kitt static int tpic2810_probe(struct i2c_client *client)
102b866526dSAndrew F. Davis {
103b866526dSAndrew F. Davis struct tpic2810 *gpio;
104b866526dSAndrew F. Davis
105b866526dSAndrew F. Davis gpio = devm_kzalloc(&client->dev, sizeof(*gpio), GFP_KERNEL);
106b866526dSAndrew F. Davis if (!gpio)
107b866526dSAndrew F. Davis return -ENOMEM;
108b866526dSAndrew F. Davis
109b866526dSAndrew F. Davis gpio->chip = template_chip;
110b866526dSAndrew F. Davis gpio->chip.parent = &client->dev;
111b866526dSAndrew F. Davis
112b866526dSAndrew F. Davis gpio->client = client;
113b866526dSAndrew F. Davis
114b866526dSAndrew F. Davis mutex_init(&gpio->lock);
115b866526dSAndrew F. Davis
1162148a7acSAndrew Davis return devm_gpiochip_add_data(&client->dev, &gpio->chip, gpio);
117b866526dSAndrew F. Davis }
118b866526dSAndrew F. Davis
119b866526dSAndrew F. Davis static const struct i2c_device_id tpic2810_id_table[] = {
120b866526dSAndrew F. Davis { "tpic2810", },
121b866526dSAndrew F. Davis { /* sentinel */ }
122b866526dSAndrew F. Davis };
123b866526dSAndrew F. Davis MODULE_DEVICE_TABLE(i2c, tpic2810_id_table);
124b866526dSAndrew F. Davis
125b866526dSAndrew F. Davis static struct i2c_driver tpic2810_driver = {
126b866526dSAndrew F. Davis .driver = {
127b866526dSAndrew F. Davis .name = "tpic2810",
128b866526dSAndrew F. Davis .of_match_table = tpic2810_of_match_table,
129b866526dSAndrew F. Davis },
130*b41cabb7SUwe Kleine-König .probe = tpic2810_probe,
131b866526dSAndrew F. Davis .id_table = tpic2810_id_table,
132b866526dSAndrew F. Davis };
133b866526dSAndrew F. Davis module_i2c_driver(tpic2810_driver);
134b866526dSAndrew F. Davis
1352148a7acSAndrew Davis MODULE_AUTHOR("Andrew Davis <afd@ti.com>");
136b866526dSAndrew F. Davis MODULE_DESCRIPTION("TPIC2810 8-Bit LED Driver GPIO Driver");
137b866526dSAndrew F. Davis MODULE_LICENSE("GPL v2");
138