1  // SPDX-License-Identifier: GPL-2.0
2  /*
3   * Copyright (C) 2015-2023 Texas Instruments Incorporated - https://www.ti.com/
4   *	Andrew Davis <afd@ti.com>
5   *
6   * Based on the TPS65912 driver
7   */
8  
9  #include <linux/gpio/driver.h>
10  #include <linux/module.h>
11  #include <linux/platform_device.h>
12  
13  #include <linux/mfd/tps65086.h>
14  
15  struct tps65086_gpio {
16  	struct gpio_chip chip;
17  	struct tps65086 *tps;
18  };
19  
tps65086_gpio_get_direction(struct gpio_chip * chip,unsigned offset)20  static int tps65086_gpio_get_direction(struct gpio_chip *chip,
21  				       unsigned offset)
22  {
23  	/* This device is output only */
24  	return GPIO_LINE_DIRECTION_OUT;
25  }
26  
tps65086_gpio_direction_input(struct gpio_chip * chip,unsigned offset)27  static int tps65086_gpio_direction_input(struct gpio_chip *chip,
28  					 unsigned offset)
29  {
30  	/* This device is output only */
31  	return -EINVAL;
32  }
33  
tps65086_gpio_direction_output(struct gpio_chip * chip,unsigned offset,int value)34  static int tps65086_gpio_direction_output(struct gpio_chip *chip,
35  					  unsigned offset, int value)
36  {
37  	struct tps65086_gpio *gpio = gpiochip_get_data(chip);
38  
39  	/* Set the initial value */
40  	regmap_update_bits(gpio->tps->regmap, TPS65086_GPOCTRL,
41  			   BIT(4 + offset), value ? BIT(4 + offset) : 0);
42  
43  	return 0;
44  }
45  
tps65086_gpio_get(struct gpio_chip * chip,unsigned offset)46  static int tps65086_gpio_get(struct gpio_chip *chip, unsigned offset)
47  {
48  	struct tps65086_gpio *gpio = gpiochip_get_data(chip);
49  	int ret, val;
50  
51  	ret = regmap_read(gpio->tps->regmap, TPS65086_GPOCTRL, &val);
52  	if (ret < 0)
53  		return ret;
54  
55  	return val & BIT(4 + offset);
56  }
57  
tps65086_gpio_set(struct gpio_chip * chip,unsigned offset,int value)58  static void tps65086_gpio_set(struct gpio_chip *chip, unsigned offset,
59  			      int value)
60  {
61  	struct tps65086_gpio *gpio = gpiochip_get_data(chip);
62  
63  	regmap_update_bits(gpio->tps->regmap, TPS65086_GPOCTRL,
64  			   BIT(4 + offset), value ? BIT(4 + offset) : 0);
65  }
66  
67  static const struct gpio_chip template_chip = {
68  	.label			= "tps65086-gpio",
69  	.owner			= THIS_MODULE,
70  	.get_direction		= tps65086_gpio_get_direction,
71  	.direction_input	= tps65086_gpio_direction_input,
72  	.direction_output	= tps65086_gpio_direction_output,
73  	.get			= tps65086_gpio_get,
74  	.set			= tps65086_gpio_set,
75  	.base			= -1,
76  	.ngpio			= 4,
77  	.can_sleep		= true,
78  };
79  
tps65086_gpio_probe(struct platform_device * pdev)80  static int tps65086_gpio_probe(struct platform_device *pdev)
81  {
82  	struct tps65086_gpio *gpio;
83  
84  	gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
85  	if (!gpio)
86  		return -ENOMEM;
87  
88  	gpio->tps = dev_get_drvdata(pdev->dev.parent);
89  	gpio->chip = template_chip;
90  	gpio->chip.parent = gpio->tps->dev;
91  
92  	return devm_gpiochip_add_data(&pdev->dev, &gpio->chip, gpio);
93  }
94  
95  static const struct platform_device_id tps65086_gpio_id_table[] = {
96  	{ "tps65086-gpio", },
97  	{ /* sentinel */ }
98  };
99  MODULE_DEVICE_TABLE(platform, tps65086_gpio_id_table);
100  
101  static struct platform_driver tps65086_gpio_driver = {
102  	.driver = {
103  		.name = "tps65086-gpio",
104  	},
105  	.probe = tps65086_gpio_probe,
106  	.id_table = tps65086_gpio_id_table,
107  };
108  module_platform_driver(tps65086_gpio_driver);
109  
110  MODULE_AUTHOR("Andrew Davis <afd@ti.com>");
111  MODULE_DESCRIPTION("TPS65086 GPIO driver");
112  MODULE_LICENSE("GPL v2");
113