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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright 2015 Verifone Int.
4 *
5 * Author: Nicolas Saenz Julienne <nicolassaenzj@gmail.com>
6 *
7 * This driver is based on the gpio-tps65912 implementation.
8 */
9
10#include <linux/kernel.h>
11#include <linux/module.h>
12#include <linux/errno.h>
13#include <linux/gpio/driver.h>
14#include <linux/platform_device.h>
15#include <linux/regmap.h>
16#include <linux/mfd/tps65218.h>
17
18struct tps65218_gpio {
19 struct tps65218 *tps65218;
20 struct gpio_chip gpio_chip;
21};
22
23static int tps65218_gpio_get(struct gpio_chip *gc, unsigned offset)
24{
25 struct tps65218_gpio *tps65218_gpio = gpiochip_get_data(gc);
26 struct tps65218 *tps65218 = tps65218_gpio->tps65218;
27 unsigned int val;
28 int ret;
29
30 ret = regmap_read(tps65218->regmap, TPS65218_REG_ENABLE2, &val);
31 if (ret)
32 return ret;
33
34 return !!(val & (TPS65218_ENABLE2_GPIO1 << offset));
35}
36
37static void tps65218_gpio_set(struct gpio_chip *gc, unsigned offset,
38 int value)
39{
40 struct tps65218_gpio *tps65218_gpio = gpiochip_get_data(gc);
41 struct tps65218 *tps65218 = tps65218_gpio->tps65218;
42
43 if (value)
44 tps65218_set_bits(tps65218, TPS65218_REG_ENABLE2,
45 TPS65218_ENABLE2_GPIO1 << offset,
46 TPS65218_ENABLE2_GPIO1 << offset,
47 TPS65218_PROTECT_L1);
48 else
49 tps65218_clear_bits(tps65218, TPS65218_REG_ENABLE2,
50 TPS65218_ENABLE2_GPIO1 << offset,
51 TPS65218_PROTECT_L1);
52}
53
54static int tps65218_gpio_output(struct gpio_chip *gc, unsigned offset,
55 int value)
56{
57 /* Only drives GPOs */
58 tps65218_gpio_set(gc, offset, value);
59 return 0;
60}
61
62static int tps65218_gpio_input(struct gpio_chip *gc, unsigned offset)
63{
64 return -EPERM;
65}
66
67static int tps65218_gpio_request(struct gpio_chip *gc, unsigned offset)
68{
69 struct tps65218_gpio *tps65218_gpio = gpiochip_get_data(gc);
70 struct tps65218 *tps65218 = tps65218_gpio->tps65218;
71 int ret;
72
73 if (gpiochip_line_is_open_source(gc, offset)) {
74 dev_err(gc->parent, "can't work as open source\n");
75 return -EINVAL;
76 }
77
78 switch (offset) {
79 case 0:
80 if (!gpiochip_line_is_open_drain(gc, offset)) {
81 dev_err(gc->parent, "GPO1 works only as open drain\n");
82 return -EINVAL;
83 }
84
85 /* Disable sequencer for GPO1 */
86 ret = tps65218_clear_bits(tps65218, TPS65218_REG_SEQ7,
87 TPS65218_SEQ7_GPO1_SEQ_MASK,
88 TPS65218_PROTECT_L1);
89 if (ret)
90 return ret;
91
92 /* Setup GPO1 */
93 ret = tps65218_clear_bits(tps65218, TPS65218_REG_CONFIG1,
94 TPS65218_CONFIG1_IO1_SEL,
95 TPS65218_PROTECT_L1);
96 if (ret)
97 return ret;
98
99 break;
100 case 1:
101 /* Setup GPO2 */
102 ret = tps65218_clear_bits(tps65218, TPS65218_REG_CONFIG1,
103 TPS65218_CONFIG1_IO1_SEL,
104 TPS65218_PROTECT_L1);
105 if (ret)
106 return ret;
107
108 break;
109
110 case 2:
111 if (!gpiochip_line_is_open_drain(gc, offset)) {
112 dev_err(gc->parent, "GPO3 works only as open drain\n");
113 return -EINVAL;
114 }
115
116 /* Disable sequencer for GPO3 */
117 ret = tps65218_clear_bits(tps65218, TPS65218_REG_SEQ7,
118 TPS65218_SEQ7_GPO3_SEQ_MASK,
119 TPS65218_PROTECT_L1);
120 if (ret)
121 return ret;
122
123 /* Setup GPO3 */
124 ret = tps65218_clear_bits(tps65218, TPS65218_REG_CONFIG2,
125 TPS65218_CONFIG2_DC12_RST,
126 TPS65218_PROTECT_L1);
127 if (ret)
128 return ret;
129
130 break;
131 default:
132 return -EINVAL;
133 }
134
135 return 0;
136}
137
138static int tps65218_gpio_set_config(struct gpio_chip *gc, unsigned offset,
139 unsigned long config)
140{
141 struct tps65218_gpio *tps65218_gpio = gpiochip_get_data(gc);
142 struct tps65218 *tps65218 = tps65218_gpio->tps65218;
143 enum pin_config_param param = pinconf_to_config_param(config);
144
145 switch (offset) {
146 case 0:
147 case 2:
148 /* GPO1 is hardwired to be open drain */
149 if (param == PIN_CONFIG_DRIVE_OPEN_DRAIN)
150 return 0;
151 return -ENOTSUPP;
152 case 1:
153 /* GPO2 is push-pull by default, can be set as open drain. */
154 if (param == PIN_CONFIG_DRIVE_OPEN_DRAIN)
155 return tps65218_clear_bits(tps65218,
156 TPS65218_REG_CONFIG1,
157 TPS65218_CONFIG1_GPO2_BUF,
158 TPS65218_PROTECT_L1);
159 if (param == PIN_CONFIG_DRIVE_PUSH_PULL)
160 return tps65218_set_bits(tps65218,
161 TPS65218_REG_CONFIG1,
162 TPS65218_CONFIG1_GPO2_BUF,
163 TPS65218_CONFIG1_GPO2_BUF,
164 TPS65218_PROTECT_L1);
165 return -ENOTSUPP;
166 default:
167 break;
168 }
169 return -ENOTSUPP;
170}
171
172static const struct gpio_chip template_chip = {
173 .label = "gpio-tps65218",
174 .owner = THIS_MODULE,
175 .request = tps65218_gpio_request,
176 .direction_output = tps65218_gpio_output,
177 .direction_input = tps65218_gpio_input,
178 .get = tps65218_gpio_get,
179 .set = tps65218_gpio_set,
180 .set_config = tps65218_gpio_set_config,
181 .can_sleep = true,
182 .ngpio = 3,
183 .base = -1,
184};
185
186static int tps65218_gpio_probe(struct platform_device *pdev)
187{
188 struct tps65218 *tps65218 = dev_get_drvdata(pdev->dev.parent);
189 struct tps65218_gpio *tps65218_gpio;
190
191 tps65218_gpio = devm_kzalloc(&pdev->dev, sizeof(*tps65218_gpio),
192 GFP_KERNEL);
193 if (!tps65218_gpio)
194 return -ENOMEM;
195
196 tps65218_gpio->tps65218 = tps65218;
197 tps65218_gpio->gpio_chip = template_chip;
198 tps65218_gpio->gpio_chip.parent = &pdev->dev;
199
200 return devm_gpiochip_add_data(&pdev->dev, &tps65218_gpio->gpio_chip,
201 tps65218_gpio);
202}
203
204static const struct of_device_id tps65218_dt_match[] = {
205 { .compatible = "ti,tps65218-gpio" },
206 { }
207};
208MODULE_DEVICE_TABLE(of, tps65218_dt_match);
209
210static const struct platform_device_id tps65218_gpio_id_table[] = {
211 { "tps65218-gpio", },
212 { /* sentinel */ }
213};
214MODULE_DEVICE_TABLE(platform, tps65218_gpio_id_table);
215
216static struct platform_driver tps65218_gpio_driver = {
217 .driver = {
218 .name = "tps65218-gpio",
219 .of_match_table = of_match_ptr(tps65218_dt_match)
220 },
221 .probe = tps65218_gpio_probe,
222 .id_table = tps65218_gpio_id_table,
223};
224
225module_platform_driver(tps65218_gpio_driver);
226
227MODULE_AUTHOR("Nicolas Saenz Julienne <nicolassaenzj@gmail.com>");
228MODULE_DESCRIPTION("GPO interface for TPS65218 PMICs");
229MODULE_LICENSE("GPL v2");
1/*
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>
20
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 */
61 tps65218_gpio_set(gc, offset, value);
62 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;
74 int ret;
75
76 if (gpiochip_line_is_open_source(gc, offset)) {
77 dev_err(gc->parent, "can't work as open source\n");
78 return -EINVAL;
79 }
80
81 switch (offset) {
82 case 0:
83 if (!gpiochip_line_is_open_drain(gc, offset)) {
84 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:
104 /* GP02 is push-pull by default, can be set as open drain. */
105 if (gpiochip_line_is_open_drain(gc, offset)) {
106 ret = tps65218_clear_bits(tps65218,
107 TPS65218_REG_CONFIG1,
108 TPS65218_CONFIG1_GPO2_BUF,
109 TPS65218_PROTECT_L1);
110 if (ret)
111 return ret;
112 }
113
114 /* Setup GPO2 */
115 ret = tps65218_clear_bits(tps65218, TPS65218_REG_CONFIG1,
116 TPS65218_CONFIG1_IO1_SEL,
117 TPS65218_PROTECT_L1);
118 if (ret)
119 return ret;
120
121 break;
122
123 case 2:
124 if (!gpiochip_line_is_open_drain(gc, offset)) {
125 dev_err(gc->parent, "GPO3 works only as open drain\n");
126 return -EINVAL;
127 }
128
129 /* Disable sequencer for GPO3 */
130 ret = tps65218_clear_bits(tps65218, TPS65218_REG_SEQ7,
131 TPS65218_SEQ7_GPO3_SEQ_MASK,
132 TPS65218_PROTECT_L1);
133 if (ret)
134 return ret;
135
136 /* Setup GPO3 */
137 ret = tps65218_clear_bits(tps65218, TPS65218_REG_CONFIG2,
138 TPS65218_CONFIG2_DC12_RST,
139 TPS65218_PROTECT_L1);
140 if (ret)
141 return ret;
142
143 break;
144 default:
145 return -EINVAL;
146 }
147
148 return 0;
149}
150
151static struct gpio_chip template_chip = {
152 .label = "gpio-tps65218",
153 .owner = THIS_MODULE,
154 .request = tps65218_gpio_request,
155 .direction_output = tps65218_gpio_output,
156 .direction_input = tps65218_gpio_input,
157 .get = tps65218_gpio_get,
158 .set = tps65218_gpio_set,
159 .can_sleep = true,
160 .ngpio = 3,
161 .base = -1,
162};
163
164static int tps65218_gpio_probe(struct platform_device *pdev)
165{
166 struct tps65218 *tps65218 = dev_get_drvdata(pdev->dev.parent);
167 struct tps65218_gpio *tps65218_gpio;
168 int ret;
169
170 tps65218_gpio = devm_kzalloc(&pdev->dev, sizeof(*tps65218_gpio),
171 GFP_KERNEL);
172 if (!tps65218_gpio)
173 return -ENOMEM;
174
175 tps65218_gpio->tps65218 = tps65218;
176 tps65218_gpio->gpio_chip = template_chip;
177 tps65218_gpio->gpio_chip.parent = &pdev->dev;
178#ifdef CONFIG_OF_GPIO
179 tps65218_gpio->gpio_chip.of_node = pdev->dev.of_node;
180#endif
181
182 ret = gpiochip_add_data(&tps65218_gpio->gpio_chip, tps65218_gpio);
183 if (ret < 0) {
184 dev_err(&pdev->dev, "Failed to register gpiochip, %d\n", ret);
185 return ret;
186 }
187
188 platform_set_drvdata(pdev, tps65218_gpio);
189
190 return ret;
191}
192
193static int tps65218_gpio_remove(struct platform_device *pdev)
194{
195 struct tps65218_gpio *tps65218_gpio = platform_get_drvdata(pdev);
196
197 gpiochip_remove(&tps65218_gpio->gpio_chip);
198
199 return 0;
200}
201
202static const struct of_device_id tps65218_dt_match[] = {
203 { .compatible = "ti,tps65218-gpio" },
204 { }
205};
206MODULE_DEVICE_TABLE(of, tps65218_dt_match);
207
208static struct platform_driver tps65218_gpio_driver = {
209 .driver = {
210 .name = "tps65218-gpio",
211 .of_match_table = of_match_ptr(tps65218_dt_match)
212 },
213 .probe = tps65218_gpio_probe,
214 .remove = tps65218_gpio_remove,
215};
216
217module_platform_driver(tps65218_gpio_driver);
218
219MODULE_AUTHOR("Nicolas Saenz Julienne <nicolassaenzj@gmail.com>");
220MODULE_DESCRIPTION("GPO interface for TPS65218 PMICs");
221MODULE_LICENSE("GPL v2");
222MODULE_ALIAS("platform:tps65218-gpio");