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Nicolas Saenz Juliennec366c762016-01-30 17:06:44 +00001/*
2 * Copyright 2015 Verifone Int.
3 *
4 * Author: Nicolas Saenz Julienne <nicolassaenzj@gmail.com>
5 *
6 * This program is free software; you can redistribute it and/or modify i t
7 * under the terms of the GNU General Public License as published by th e
8 * Free Software Foundation; either version 2 of the License, or (at you r
9 * option) any later version.
10 *
11 * This driver is based on the gpio-tps65912 implementation.
12 */
13
14#include <linux/kernel.h>
15#include <linux/module.h>
16#include <linux/errno.h>
17#include <linux/gpio/driver.h>
18#include <linux/platform_device.h>
19#include <linux/mfd/tps65218.h>
Nicolas Saenz Juliennec366c762016-01-30 17:06:44 +000020
21struct tps65218_gpio {
22 struct tps65218 *tps65218;
23 struct gpio_chip gpio_chip;
24};
25
26static int tps65218_gpio_get(struct gpio_chip *gc, unsigned offset)
27{
28 struct tps65218_gpio *tps65218_gpio = gpiochip_get_data(gc);
29 struct tps65218 *tps65218 = tps65218_gpio->tps65218;
30 unsigned int val;
31 int ret;
32
33 ret = tps65218_reg_read(tps65218, TPS65218_REG_ENABLE2, &val);
34 if (ret)
35 return ret;
36
37 return !!(val & (TPS65218_ENABLE2_GPIO1 << offset));
38}
39
40static void tps65218_gpio_set(struct gpio_chip *gc, unsigned offset,
41 int value)
42{
43 struct tps65218_gpio *tps65218_gpio = gpiochip_get_data(gc);
44 struct tps65218 *tps65218 = tps65218_gpio->tps65218;
45
46 if (value)
47 tps65218_set_bits(tps65218, TPS65218_REG_ENABLE2,
48 TPS65218_ENABLE2_GPIO1 << offset,
49 TPS65218_ENABLE2_GPIO1 << offset,
50 TPS65218_PROTECT_L1);
51 else
52 tps65218_clear_bits(tps65218, TPS65218_REG_ENABLE2,
53 TPS65218_ENABLE2_GPIO1 << offset,
54 TPS65218_PROTECT_L1);
55}
56
57static int tps65218_gpio_output(struct gpio_chip *gc, unsigned offset,
58 int value)
59{
60 /* Only drives GPOs */
Axel Lin818cc6a2016-02-15 20:10:40 +080061 tps65218_gpio_set(gc, offset, value);
Nicolas Saenz Juliennec366c762016-01-30 17:06:44 +000062 return 0;
63}
64
65static int tps65218_gpio_input(struct gpio_chip *gc, unsigned offset)
66{
67 return -EPERM;
68}
69
70static int tps65218_gpio_request(struct gpio_chip *gc, unsigned offset)
71{
72 struct tps65218_gpio *tps65218_gpio = gpiochip_get_data(gc);
73 struct tps65218 *tps65218 = tps65218_gpio->tps65218;
Nicolas Saenz Juliennec366c762016-01-30 17:06:44 +000074 int ret;
75
Linus Walleij143b65d2016-02-16 15:41:42 +010076 if (gpiochip_line_is_open_source(gc, offset)) {
Nicolas Saenz Juliennec366c762016-01-30 17:06:44 +000077 dev_err(gc->parent, "can't work as open source\n");
78 return -EINVAL;
79 }
80
81 switch (offset) {
82 case 0:
Linus Walleij143b65d2016-02-16 15:41:42 +010083 if (!gpiochip_line_is_open_drain(gc, offset)) {
Nicolas Saenz Juliennec366c762016-01-30 17:06:44 +000084 dev_err(gc->parent, "GPO1 works only as open drain\n");
85 return -EINVAL;
86 }
87
88 /* Disable sequencer for GPO1 */
89 ret = tps65218_clear_bits(tps65218, TPS65218_REG_SEQ7,
90 TPS65218_SEQ7_GPO1_SEQ_MASK,
91 TPS65218_PROTECT_L1);
92 if (ret)
93 return ret;
94
95 /* Setup GPO1 */
96 ret = tps65218_clear_bits(tps65218, TPS65218_REG_CONFIG1,
97 TPS65218_CONFIG1_IO1_SEL,
98 TPS65218_PROTECT_L1);
99 if (ret)
100 return ret;
101
102 break;
103 case 1:
Nicolas Saenz Juliennec366c762016-01-30 17:06:44 +0000104 /* Setup GPO2 */
105 ret = tps65218_clear_bits(tps65218, TPS65218_REG_CONFIG1,
106 TPS65218_CONFIG1_IO1_SEL,
107 TPS65218_PROTECT_L1);
108 if (ret)
109 return ret;
110
111 break;
112
113 case 2:
Linus Walleij143b65d2016-02-16 15:41:42 +0100114 if (!gpiochip_line_is_open_drain(gc, offset)) {
Nicolas Saenz Juliennec366c762016-01-30 17:06:44 +0000115 dev_err(gc->parent, "GPO3 works only as open drain\n");
116 return -EINVAL;
117 }
118
119 /* Disable sequencer for GPO3 */
120 ret = tps65218_clear_bits(tps65218, TPS65218_REG_SEQ7,
121 TPS65218_SEQ7_GPO3_SEQ_MASK,
122 TPS65218_PROTECT_L1);
123 if (ret)
124 return ret;
125
126 /* Setup GPO3 */
127 ret = tps65218_clear_bits(tps65218, TPS65218_REG_CONFIG2,
128 TPS65218_CONFIG2_DC12_RST,
129 TPS65218_PROTECT_L1);
130 if (ret)
131 return ret;
132
133 break;
134 default:
135 return -EINVAL;
136 }
137
138 return 0;
139}
140
Linus Walleijf30e49f2016-04-08 14:13:53 +0200141static int tps65218_gpio_set_single_ended(struct gpio_chip *gc,
142 unsigned offset,
143 enum single_ended_mode mode)
144{
145 struct tps65218_gpio *tps65218_gpio = gpiochip_get_data(gc);
146 struct tps65218 *tps65218 = tps65218_gpio->tps65218;
147
148 switch (offset) {
149 case 0:
150 case 2:
151 /* GPO1 is hardwired to be open drain */
152 if (mode == LINE_MODE_OPEN_DRAIN)
153 return 0;
154 return -ENOTSUPP;
155 case 1:
156 /* GPO2 is push-pull by default, can be set as open drain. */
157 if (mode == LINE_MODE_OPEN_DRAIN)
158 return tps65218_clear_bits(tps65218,
159 TPS65218_REG_CONFIG1,
160 TPS65218_CONFIG1_GPO2_BUF,
161 TPS65218_PROTECT_L1);
162 if (mode == LINE_MODE_PUSH_PULL)
163 return tps65218_set_bits(tps65218,
164 TPS65218_REG_CONFIG1,
165 TPS65218_CONFIG1_GPO2_BUF,
166 TPS65218_CONFIG1_GPO2_BUF,
167 TPS65218_PROTECT_L1);
168 return -ENOTSUPP;
169 default:
170 break;
171 }
172 return -ENOTSUPP;
173}
174
Nicolas Saenz Juliennec366c762016-01-30 17:06:44 +0000175static struct gpio_chip template_chip = {
176 .label = "gpio-tps65218",
177 .owner = THIS_MODULE,
178 .request = tps65218_gpio_request,
179 .direction_output = tps65218_gpio_output,
180 .direction_input = tps65218_gpio_input,
181 .get = tps65218_gpio_get,
182 .set = tps65218_gpio_set,
Linus Walleijf30e49f2016-04-08 14:13:53 +0200183 .set_single_ended = tps65218_gpio_set_single_ended,
Nicolas Saenz Juliennec366c762016-01-30 17:06:44 +0000184 .can_sleep = true,
185 .ngpio = 3,
186 .base = -1,
187};
188
189static int tps65218_gpio_probe(struct platform_device *pdev)
190{
191 struct tps65218 *tps65218 = dev_get_drvdata(pdev->dev.parent);
192 struct tps65218_gpio *tps65218_gpio;
193 int ret;
194
195 tps65218_gpio = devm_kzalloc(&pdev->dev, sizeof(*tps65218_gpio),
196 GFP_KERNEL);
197 if (!tps65218_gpio)
198 return -ENOMEM;
199
200 tps65218_gpio->tps65218 = tps65218;
201 tps65218_gpio->gpio_chip = template_chip;
202 tps65218_gpio->gpio_chip.parent = &pdev->dev;
203#ifdef CONFIG_OF_GPIO
204 tps65218_gpio->gpio_chip.of_node = pdev->dev.of_node;
205#endif
206
207 ret = gpiochip_add_data(&tps65218_gpio->gpio_chip, tps65218_gpio);
208 if (ret < 0) {
209 dev_err(&pdev->dev, "Failed to register gpiochip, %d\n", ret);
210 return ret;
211 }
212
213 platform_set_drvdata(pdev, tps65218_gpio);
214
215 return ret;
216}
217
218static int tps65218_gpio_remove(struct platform_device *pdev)
219{
220 struct tps65218_gpio *tps65218_gpio = platform_get_drvdata(pdev);
221
222 gpiochip_remove(&tps65218_gpio->gpio_chip);
223
224 return 0;
225}
226
227static const struct of_device_id tps65218_dt_match[] = {
228 { .compatible = "ti,tps65218-gpio" },
229 { }
230};
231MODULE_DEVICE_TABLE(of, tps65218_dt_match);
232
Keerthya944a892016-06-28 18:00:52 +0530233static const struct platform_device_id tps65218_gpio_id_table[] = {
234 { "tps65218-gpio", },
235 { /* sentinel */ }
236};
237MODULE_DEVICE_TABLE(platform, tps65218_gpio_id_table);
238
Nicolas Saenz Juliennec366c762016-01-30 17:06:44 +0000239static struct platform_driver tps65218_gpio_driver = {
240 .driver = {
241 .name = "tps65218-gpio",
242 .of_match_table = of_match_ptr(tps65218_dt_match)
243 },
244 .probe = tps65218_gpio_probe,
245 .remove = tps65218_gpio_remove,
Keerthya944a892016-06-28 18:00:52 +0530246 .id_table = tps65218_gpio_id_table,
Nicolas Saenz Juliennec366c762016-01-30 17:06:44 +0000247};
248
249module_platform_driver(tps65218_gpio_driver);
250
251MODULE_AUTHOR("Nicolas Saenz Julienne <nicolassaenzj@gmail.com>");
252MODULE_DESCRIPTION("GPO interface for TPS65218 PMICs");
253MODULE_LICENSE("GPL v2");
254MODULE_ALIAS("platform:tps65218-gpio");