1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * TI Palma series PMIC's GPIO driver.
4 *
5 * Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved.
6 *
7 * Author: Laxman Dewangan <ldewangan@nvidia.com>
8 */
9
10 #include <linux/gpio/driver.h>
11 #include <linux/kernel.h>
12 #include <linux/init.h>
13 #include <linux/mfd/palmas.h>
14 #include <linux/of.h>
15 #include <linux/platform_device.h>
16
17 struct palmas_gpio {
18 struct gpio_chip gpio_chip;
19 struct palmas *palmas;
20 };
21
22 struct palmas_device_data {
23 int ngpio;
24 };
25
palmas_gpio_get(struct gpio_chip * gc,unsigned offset)26 static int palmas_gpio_get(struct gpio_chip *gc, unsigned offset)
27 {
28 struct palmas_gpio *pg = gpiochip_get_data(gc);
29 struct palmas *palmas = pg->palmas;
30 unsigned int val;
31 int ret;
32 unsigned int reg;
33 int gpio16 = (offset/8);
34
35 offset %= 8;
36 reg = (gpio16) ? PALMAS_GPIO_DATA_DIR2 : PALMAS_GPIO_DATA_DIR;
37
38 ret = palmas_read(palmas, PALMAS_GPIO_BASE, reg, &val);
39 if (ret < 0) {
40 dev_err(gc->parent, "Reg 0x%02x read failed, %d\n", reg, ret);
41 return ret;
42 }
43
44 if (val & BIT(offset))
45 reg = (gpio16) ? PALMAS_GPIO_DATA_OUT2 : PALMAS_GPIO_DATA_OUT;
46 else
47 reg = (gpio16) ? PALMAS_GPIO_DATA_IN2 : PALMAS_GPIO_DATA_IN;
48
49 ret = palmas_read(palmas, PALMAS_GPIO_BASE, reg, &val);
50 if (ret < 0) {
51 dev_err(gc->parent, "Reg 0x%02x read failed, %d\n", reg, ret);
52 return ret;
53 }
54 return !!(val & BIT(offset));
55 }
56
palmas_gpio_set(struct gpio_chip * gc,unsigned offset,int value)57 static void palmas_gpio_set(struct gpio_chip *gc, unsigned offset,
58 int value)
59 {
60 struct palmas_gpio *pg = gpiochip_get_data(gc);
61 struct palmas *palmas = pg->palmas;
62 int ret;
63 unsigned int reg;
64 int gpio16 = (offset/8);
65
66 offset %= 8;
67 if (gpio16)
68 reg = (value) ?
69 PALMAS_GPIO_SET_DATA_OUT2 : PALMAS_GPIO_CLEAR_DATA_OUT2;
70 else
71 reg = (value) ?
72 PALMAS_GPIO_SET_DATA_OUT : PALMAS_GPIO_CLEAR_DATA_OUT;
73
74 ret = palmas_write(palmas, PALMAS_GPIO_BASE, reg, BIT(offset));
75 if (ret < 0)
76 dev_err(gc->parent, "Reg 0x%02x write failed, %d\n", reg, ret);
77 }
78
palmas_gpio_output(struct gpio_chip * gc,unsigned offset,int value)79 static int palmas_gpio_output(struct gpio_chip *gc, unsigned offset,
80 int value)
81 {
82 struct palmas_gpio *pg = gpiochip_get_data(gc);
83 struct palmas *palmas = pg->palmas;
84 int ret;
85 unsigned int reg;
86 int gpio16 = (offset/8);
87
88 offset %= 8;
89 reg = (gpio16) ? PALMAS_GPIO_DATA_DIR2 : PALMAS_GPIO_DATA_DIR;
90
91 /* Set the initial value */
92 palmas_gpio_set(gc, offset, value);
93
94 ret = palmas_update_bits(palmas, PALMAS_GPIO_BASE, reg,
95 BIT(offset), BIT(offset));
96 if (ret < 0)
97 dev_err(gc->parent, "Reg 0x%02x update failed, %d\n", reg,
98 ret);
99 return ret;
100 }
101
palmas_gpio_input(struct gpio_chip * gc,unsigned offset)102 static int palmas_gpio_input(struct gpio_chip *gc, unsigned offset)
103 {
104 struct palmas_gpio *pg = gpiochip_get_data(gc);
105 struct palmas *palmas = pg->palmas;
106 int ret;
107 unsigned int reg;
108 int gpio16 = (offset/8);
109
110 offset %= 8;
111 reg = (gpio16) ? PALMAS_GPIO_DATA_DIR2 : PALMAS_GPIO_DATA_DIR;
112
113 ret = palmas_update_bits(palmas, PALMAS_GPIO_BASE, reg, BIT(offset), 0);
114 if (ret < 0)
115 dev_err(gc->parent, "Reg 0x%02x update failed, %d\n", reg,
116 ret);
117 return ret;
118 }
119
palmas_gpio_to_irq(struct gpio_chip * gc,unsigned offset)120 static int palmas_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
121 {
122 struct palmas_gpio *pg = gpiochip_get_data(gc);
123 struct palmas *palmas = pg->palmas;
124
125 return palmas_irq_get_virq(palmas, PALMAS_GPIO_0_IRQ + offset);
126 }
127
128 static const struct palmas_device_data palmas_dev_data = {
129 .ngpio = 8,
130 };
131
132 static const struct palmas_device_data tps80036_dev_data = {
133 .ngpio = 16,
134 };
135
136 static const struct of_device_id of_palmas_gpio_match[] = {
137 { .compatible = "ti,palmas-gpio", .data = &palmas_dev_data,},
138 { .compatible = "ti,tps65913-gpio", .data = &palmas_dev_data,},
139 { .compatible = "ti,tps65914-gpio", .data = &palmas_dev_data,},
140 { .compatible = "ti,tps80036-gpio", .data = &tps80036_dev_data,},
141 { },
142 };
143
palmas_gpio_probe(struct platform_device * pdev)144 static int palmas_gpio_probe(struct platform_device *pdev)
145 {
146 struct palmas *palmas = dev_get_drvdata(pdev->dev.parent);
147 struct palmas_platform_data *palmas_pdata;
148 struct palmas_gpio *palmas_gpio;
149 int ret;
150 const struct palmas_device_data *dev_data;
151
152 dev_data = of_device_get_match_data(&pdev->dev);
153 if (!dev_data)
154 dev_data = &palmas_dev_data;
155
156 palmas_gpio = devm_kzalloc(&pdev->dev,
157 sizeof(*palmas_gpio), GFP_KERNEL);
158 if (!palmas_gpio)
159 return -ENOMEM;
160
161 palmas_gpio->palmas = palmas;
162 palmas_gpio->gpio_chip.owner = THIS_MODULE;
163 palmas_gpio->gpio_chip.label = dev_name(&pdev->dev);
164 palmas_gpio->gpio_chip.ngpio = dev_data->ngpio;
165 palmas_gpio->gpio_chip.can_sleep = true;
166 palmas_gpio->gpio_chip.direction_input = palmas_gpio_input;
167 palmas_gpio->gpio_chip.direction_output = palmas_gpio_output;
168 palmas_gpio->gpio_chip.to_irq = palmas_gpio_to_irq;
169 palmas_gpio->gpio_chip.set = palmas_gpio_set;
170 palmas_gpio->gpio_chip.get = palmas_gpio_get;
171 palmas_gpio->gpio_chip.parent = &pdev->dev;
172
173 palmas_pdata = dev_get_platdata(palmas->dev);
174 if (palmas_pdata && palmas_pdata->gpio_base)
175 palmas_gpio->gpio_chip.base = palmas_pdata->gpio_base;
176 else
177 palmas_gpio->gpio_chip.base = -1;
178
179 ret = devm_gpiochip_add_data(&pdev->dev, &palmas_gpio->gpio_chip,
180 palmas_gpio);
181 if (ret < 0) {
182 dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
183 return ret;
184 }
185
186 return ret;
187 }
188
189 static struct platform_driver palmas_gpio_driver = {
190 .driver.name = "palmas-gpio",
191 .driver.of_match_table = of_palmas_gpio_match,
192 .probe = palmas_gpio_probe,
193 };
194
palmas_gpio_init(void)195 static int __init palmas_gpio_init(void)
196 {
197 return platform_driver_register(&palmas_gpio_driver);
198 }
199 subsys_initcall(palmas_gpio_init);
200