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 int offset,int value)57 static int palmas_gpio_set(struct gpio_chip *gc, unsigned int offset,
58 int value)
59 {
60 struct palmas_gpio *pg = gpiochip_get_data(gc);
61 struct palmas *palmas = pg->palmas;
62 unsigned int reg;
63 int gpio16 = (offset/8);
64
65 offset %= 8;
66 if (gpio16)
67 reg = (value) ?
68 PALMAS_GPIO_SET_DATA_OUT2 : PALMAS_GPIO_CLEAR_DATA_OUT2;
69 else
70 reg = (value) ?
71 PALMAS_GPIO_SET_DATA_OUT : PALMAS_GPIO_CLEAR_DATA_OUT;
72
73 return palmas_write(palmas, PALMAS_GPIO_BASE, reg, BIT(offset));
74 }
75
palmas_gpio_output(struct gpio_chip * gc,unsigned offset,int value)76 static int palmas_gpio_output(struct gpio_chip *gc, unsigned offset,
77 int value)
78 {
79 struct palmas_gpio *pg = gpiochip_get_data(gc);
80 struct palmas *palmas = pg->palmas;
81 int ret;
82 unsigned int reg;
83 int gpio16 = (offset/8);
84
85 offset %= 8;
86 reg = (gpio16) ? PALMAS_GPIO_DATA_DIR2 : PALMAS_GPIO_DATA_DIR;
87
88 /* Set the initial value */
89 ret = palmas_gpio_set(gc, offset, value);
90 if (ret)
91 return ret;
92
93 ret = palmas_update_bits(palmas, PALMAS_GPIO_BASE, reg,
94 BIT(offset), BIT(offset));
95 if (ret < 0)
96 dev_err(gc->parent, "Reg 0x%02x update failed, %d\n", reg,
97 ret);
98 return ret;
99 }
100
palmas_gpio_input(struct gpio_chip * gc,unsigned offset)101 static int palmas_gpio_input(struct gpio_chip *gc, unsigned offset)
102 {
103 struct palmas_gpio *pg = gpiochip_get_data(gc);
104 struct palmas *palmas = pg->palmas;
105 int ret;
106 unsigned int reg;
107 int gpio16 = (offset/8);
108
109 offset %= 8;
110 reg = (gpio16) ? PALMAS_GPIO_DATA_DIR2 : PALMAS_GPIO_DATA_DIR;
111
112 ret = palmas_update_bits(palmas, PALMAS_GPIO_BASE, reg, BIT(offset), 0);
113 if (ret < 0)
114 dev_err(gc->parent, "Reg 0x%02x update failed, %d\n", reg,
115 ret);
116 return ret;
117 }
118
palmas_gpio_get_direction(struct gpio_chip * gc,unsigned int offset)119 static int palmas_gpio_get_direction(struct gpio_chip *gc, unsigned int offset)
120 {
121 struct palmas_gpio *pg = gpiochip_get_data(gc);
122 struct palmas *palmas = pg->palmas;
123 unsigned int val;
124 unsigned int reg;
125 int ret;
126 int gpio16 = (offset/8);
127
128 offset %= 8;
129 reg = (gpio16) ? PALMAS_GPIO_DATA_DIR2 : PALMAS_GPIO_DATA_DIR;
130 ret = palmas_read(palmas, PALMAS_GPIO_BASE, reg, &val);
131 if (ret)
132 return ret;
133
134 return (val & BIT(offset)) ? GPIO_LINE_DIRECTION_OUT : GPIO_LINE_DIRECTION_IN;
135 }
136
palmas_gpio_to_irq(struct gpio_chip * gc,unsigned offset)137 static int palmas_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
138 {
139 struct palmas_gpio *pg = gpiochip_get_data(gc);
140 struct palmas *palmas = pg->palmas;
141
142 return palmas_irq_get_virq(palmas, PALMAS_GPIO_0_IRQ + offset);
143 }
144
145 static const struct palmas_device_data palmas_dev_data = {
146 .ngpio = 8,
147 };
148
149 static const struct palmas_device_data tps80036_dev_data = {
150 .ngpio = 16,
151 };
152
153 static const struct of_device_id of_palmas_gpio_match[] = {
154 { .compatible = "ti,palmas-gpio", .data = &palmas_dev_data,},
155 { .compatible = "ti,tps65913-gpio", .data = &palmas_dev_data,},
156 { .compatible = "ti,tps65914-gpio", .data = &palmas_dev_data,},
157 { .compatible = "ti,tps80036-gpio", .data = &tps80036_dev_data,},
158 { },
159 };
160 MODULE_DEVICE_TABLE(of, of_palmas_gpio_match);
161
palmas_gpio_probe(struct platform_device * pdev)162 static int palmas_gpio_probe(struct platform_device *pdev)
163 {
164 struct palmas *palmas = dev_get_drvdata(pdev->dev.parent);
165 struct palmas_platform_data *palmas_pdata;
166 struct palmas_gpio *palmas_gpio;
167 int ret;
168 const struct palmas_device_data *dev_data;
169
170 dev_data = of_device_get_match_data(&pdev->dev);
171 if (!dev_data)
172 dev_data = &palmas_dev_data;
173
174 palmas_gpio = devm_kzalloc(&pdev->dev,
175 sizeof(*palmas_gpio), GFP_KERNEL);
176 if (!palmas_gpio)
177 return -ENOMEM;
178
179 palmas_gpio->palmas = palmas;
180 palmas_gpio->gpio_chip.owner = THIS_MODULE;
181 palmas_gpio->gpio_chip.label = dev_name(&pdev->dev);
182 palmas_gpio->gpio_chip.ngpio = dev_data->ngpio;
183 palmas_gpio->gpio_chip.can_sleep = true;
184 palmas_gpio->gpio_chip.direction_input = palmas_gpio_input;
185 palmas_gpio->gpio_chip.direction_output = palmas_gpio_output;
186 palmas_gpio->gpio_chip.get_direction = palmas_gpio_get_direction;
187 palmas_gpio->gpio_chip.to_irq = palmas_gpio_to_irq;
188 palmas_gpio->gpio_chip.set = palmas_gpio_set;
189 palmas_gpio->gpio_chip.get = palmas_gpio_get;
190 palmas_gpio->gpio_chip.parent = &pdev->dev;
191
192 palmas_pdata = dev_get_platdata(palmas->dev);
193 if (palmas_pdata && palmas_pdata->gpio_base)
194 palmas_gpio->gpio_chip.base = palmas_pdata->gpio_base;
195 else
196 palmas_gpio->gpio_chip.base = -1;
197
198 ret = devm_gpiochip_add_data(&pdev->dev, &palmas_gpio->gpio_chip,
199 palmas_gpio);
200 if (ret < 0) {
201 dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
202 return ret;
203 }
204
205 return ret;
206 }
207
208 static struct platform_driver palmas_gpio_driver = {
209 .driver.name = "palmas-gpio",
210 .driver.of_match_table = of_palmas_gpio_match,
211 .probe = palmas_gpio_probe,
212 };
213
palmas_gpio_init(void)214 static int __init palmas_gpio_init(void)
215 {
216 return platform_driver_register(&palmas_gpio_driver);
217 }
218 subsys_initcall(palmas_gpio_init);
219
palmas_gpio_exit(void)220 static void __exit palmas_gpio_exit(void)
221 {
222 platform_driver_unregister(&palmas_gpio_driver);
223 }
224 module_exit(palmas_gpio_exit);
225
226 MODULE_DESCRIPTION("TI PALMAS series GPIO driver");
227 MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
228 MODULE_LICENSE("GPL");
229