1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * GPIO driver for TPS68470 PMIC
4 *
5 * Copyright (C) 2017 Intel Corporation
6 *
7 * Authors:
8 * Antti Laakso <antti.laakso@intel.com>
9 * Tianshu Qiu <tian.shu.qiu@intel.com>
10 * Jian Xu Zheng <jian.xu.zheng@intel.com>
11 * Yuning Pu <yuning.pu@intel.com>
12 */
13
14 #include <linux/gpio/driver.h>
15 #include <linux/mfd/tps68470.h>
16 #include <linux/module.h>
17 #include <linux/platform_device.h>
18 #include <linux/regmap.h>
19
20 #define TPS68470_N_LOGIC_OUTPUT 3
21 #define TPS68470_N_REGULAR_GPIO 7
22 #define TPS68470_N_GPIO (TPS68470_N_LOGIC_OUTPUT + TPS68470_N_REGULAR_GPIO)
23
24 struct tps68470_gpio_data {
25 struct regmap *tps68470_regmap;
26 struct gpio_chip gc;
27 };
28
tps68470_gpio_get(struct gpio_chip * gc,unsigned int offset)29 static int tps68470_gpio_get(struct gpio_chip *gc, unsigned int offset)
30 {
31 struct tps68470_gpio_data *tps68470_gpio = gpiochip_get_data(gc);
32 struct regmap *regmap = tps68470_gpio->tps68470_regmap;
33 unsigned int reg = TPS68470_REG_GPDO;
34 int val, ret;
35
36 if (offset >= TPS68470_N_REGULAR_GPIO) {
37 offset -= TPS68470_N_REGULAR_GPIO;
38 reg = TPS68470_REG_SGPO;
39 }
40
41 ret = regmap_read(regmap, reg, &val);
42 if (ret) {
43 dev_err(tps68470_gpio->gc.parent, "reg 0x%x read failed\n",
44 TPS68470_REG_SGPO);
45 return ret;
46 }
47 return !!(val & BIT(offset));
48 }
49
tps68470_gpio_get_direction(struct gpio_chip * gc,unsigned int offset)50 static int tps68470_gpio_get_direction(struct gpio_chip *gc,
51 unsigned int offset)
52 {
53 struct tps68470_gpio_data *tps68470_gpio = gpiochip_get_data(gc);
54 struct regmap *regmap = tps68470_gpio->tps68470_regmap;
55 int val, ret;
56
57 /* rest are always outputs */
58 if (offset >= TPS68470_N_REGULAR_GPIO)
59 return GPIO_LINE_DIRECTION_OUT;
60
61 ret = regmap_read(regmap, TPS68470_GPIO_CTL_REG_A(offset), &val);
62 if (ret) {
63 dev_err(tps68470_gpio->gc.parent, "reg 0x%x read failed\n",
64 TPS68470_GPIO_CTL_REG_A(offset));
65 return ret;
66 }
67
68 val &= TPS68470_GPIO_MODE_MASK;
69 return val >= TPS68470_GPIO_MODE_OUT_CMOS ? GPIO_LINE_DIRECTION_OUT :
70 GPIO_LINE_DIRECTION_IN;
71 }
72
tps68470_gpio_set(struct gpio_chip * gc,unsigned int offset,int value)73 static void tps68470_gpio_set(struct gpio_chip *gc, unsigned int offset,
74 int value)
75 {
76 struct tps68470_gpio_data *tps68470_gpio = gpiochip_get_data(gc);
77 struct regmap *regmap = tps68470_gpio->tps68470_regmap;
78 unsigned int reg = TPS68470_REG_GPDO;
79
80 if (offset >= TPS68470_N_REGULAR_GPIO) {
81 reg = TPS68470_REG_SGPO;
82 offset -= TPS68470_N_REGULAR_GPIO;
83 }
84
85 regmap_update_bits(regmap, reg, BIT(offset), value ? BIT(offset) : 0);
86 }
87
tps68470_gpio_output(struct gpio_chip * gc,unsigned int offset,int value)88 static int tps68470_gpio_output(struct gpio_chip *gc, unsigned int offset,
89 int value)
90 {
91 struct tps68470_gpio_data *tps68470_gpio = gpiochip_get_data(gc);
92 struct regmap *regmap = tps68470_gpio->tps68470_regmap;
93
94 /* Set the initial value */
95 tps68470_gpio_set(gc, offset, value);
96
97 /* rest are always outputs */
98 if (offset >= TPS68470_N_REGULAR_GPIO)
99 return 0;
100
101 return regmap_update_bits(regmap, TPS68470_GPIO_CTL_REG_A(offset),
102 TPS68470_GPIO_MODE_MASK,
103 TPS68470_GPIO_MODE_OUT_CMOS);
104 }
105
tps68470_gpio_input(struct gpio_chip * gc,unsigned int offset)106 static int tps68470_gpio_input(struct gpio_chip *gc, unsigned int offset)
107 {
108 struct tps68470_gpio_data *tps68470_gpio = gpiochip_get_data(gc);
109 struct regmap *regmap = tps68470_gpio->tps68470_regmap;
110
111 /* rest are always outputs */
112 if (offset >= TPS68470_N_REGULAR_GPIO)
113 return -EINVAL;
114
115 return regmap_update_bits(regmap, TPS68470_GPIO_CTL_REG_A(offset),
116 TPS68470_GPIO_MODE_MASK, 0x00);
117 }
118
119 static const char *tps68470_names[TPS68470_N_GPIO] = {
120 "gpio.0", "gpio.1", "gpio.2", "gpio.3",
121 "gpio.4", "gpio.5", "gpio.6",
122 "s_enable", "s_idle", "s_resetn",
123 };
124
tps68470_gpio_probe(struct platform_device * pdev)125 static int tps68470_gpio_probe(struct platform_device *pdev)
126 {
127 struct tps68470_gpio_data *tps68470_gpio;
128
129 tps68470_gpio = devm_kzalloc(&pdev->dev, sizeof(*tps68470_gpio),
130 GFP_KERNEL);
131 if (!tps68470_gpio)
132 return -ENOMEM;
133
134 tps68470_gpio->tps68470_regmap = dev_get_drvdata(pdev->dev.parent);
135 tps68470_gpio->gc.label = "tps68470-gpio";
136 tps68470_gpio->gc.owner = THIS_MODULE;
137 tps68470_gpio->gc.direction_input = tps68470_gpio_input;
138 tps68470_gpio->gc.direction_output = tps68470_gpio_output;
139 tps68470_gpio->gc.get = tps68470_gpio_get;
140 tps68470_gpio->gc.get_direction = tps68470_gpio_get_direction;
141 tps68470_gpio->gc.set = tps68470_gpio_set;
142 tps68470_gpio->gc.can_sleep = true;
143 tps68470_gpio->gc.names = tps68470_names;
144 tps68470_gpio->gc.ngpio = TPS68470_N_GPIO;
145 tps68470_gpio->gc.base = -1;
146 tps68470_gpio->gc.parent = &pdev->dev;
147
148 return devm_gpiochip_add_data(&pdev->dev, &tps68470_gpio->gc, tps68470_gpio);
149 }
150
151 static struct platform_driver tps68470_gpio_driver = {
152 .driver = {
153 .name = "tps68470-gpio",
154 },
155 .probe = tps68470_gpio_probe,
156 };
157 module_platform_driver(tps68470_gpio_driver);
158
159 MODULE_ALIAS("platform:tps68470-gpio");
160 MODULE_DESCRIPTION("GPIO driver for TPS68470 PMIC");
161 MODULE_LICENSE("GPL v2");
162