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/regmap.h>
20#include <linux/mfd/tps65218.h>
21
22struct tps65218_gpio {
23 struct tps65218 *tps65218;
24 struct gpio_chip gpio_chip;
25};
26
27static int tps65218_gpio_get(struct gpio_chip *gc, unsigned offset)
28{
29 struct tps65218_gpio *tps65218_gpio = gpiochip_get_data(gc);
30 struct tps65218 *tps65218 = tps65218_gpio->tps65218;
31 unsigned int val;
32 int ret;
33
34 ret = regmap_read(tps65218->regmap, TPS65218_REG_ENABLE2, &val);
35 if (ret)
36 return ret;
37
38 return !!(val & (TPS65218_ENABLE2_GPIO1 << offset));
39}
40
41static void tps65218_gpio_set(struct gpio_chip *gc, unsigned offset,
42 int value)
43{
44 struct tps65218_gpio *tps65218_gpio = gpiochip_get_data(gc);
45 struct tps65218 *tps65218 = tps65218_gpio->tps65218;
46
47 if (value)
48 tps65218_set_bits(tps65218, TPS65218_REG_ENABLE2,
49 TPS65218_ENABLE2_GPIO1 << offset,
50 TPS65218_ENABLE2_GPIO1 << offset,
51 TPS65218_PROTECT_L1);
52 else
53 tps65218_clear_bits(tps65218, TPS65218_REG_ENABLE2,
54 TPS65218_ENABLE2_GPIO1 << offset,
55 TPS65218_PROTECT_L1);
56}
57
58static int tps65218_gpio_output(struct gpio_chip *gc, unsigned offset,
59 int value)
60{
61 /* Only drives GPOs */
62 tps65218_gpio_set(gc, offset, value);
63 return 0;
64}
65
66static int tps65218_gpio_input(struct gpio_chip *gc, unsigned offset)
67{
68 return -EPERM;
69}
70
71static int tps65218_gpio_request(struct gpio_chip *gc, unsigned offset)
72{
73 struct tps65218_gpio *tps65218_gpio = gpiochip_get_data(gc);
74 struct tps65218 *tps65218 = tps65218_gpio->tps65218;
75 int ret;
76
77 if (gpiochip_line_is_open_source(gc, offset)) {
78 dev_err(gc->parent, "can't work as open source\n");
79 return -EINVAL;
80 }
81
82 switch (offset) {
83 case 0:
84 if (!gpiochip_line_is_open_drain(gc, offset)) {
85 dev_err(gc->parent, "GPO1 works only as open drain\n");
86 return -EINVAL;
87 }
88
89 /* Disable sequencer for GPO1 */
90 ret = tps65218_clear_bits(tps65218, TPS65218_REG_SEQ7,
91 TPS65218_SEQ7_GPO1_SEQ_MASK,
92 TPS65218_PROTECT_L1);
93 if (ret)
94 return ret;
95
96 /* Setup GPO1 */
97 ret = tps65218_clear_bits(tps65218, TPS65218_REG_CONFIG1,
98 TPS65218_CONFIG1_IO1_SEL,
99 TPS65218_PROTECT_L1);
100 if (ret)
101 return ret;
102
103 break;
104 case 1:
105 /* Setup GPO2 */
106 ret = tps65218_clear_bits(tps65218, TPS65218_REG_CONFIG1,
107 TPS65218_CONFIG1_IO1_SEL,
108 TPS65218_PROTECT_L1);
109 if (ret)
110 return ret;
111
112 break;
113
114 case 2:
115 if (!gpiochip_line_is_open_drain(gc, offset)) {
116 dev_err(gc->parent, "GPO3 works only as open drain\n");
117 return -EINVAL;
118 }
119
120 /* Disable sequencer for GPO3 */
121 ret = tps65218_clear_bits(tps65218, TPS65218_REG_SEQ7,
122 TPS65218_SEQ7_GPO3_SEQ_MASK,
123 TPS65218_PROTECT_L1);
124 if (ret)
125 return ret;
126
127 /* Setup GPO3 */
128 ret = tps65218_clear_bits(tps65218, TPS65218_REG_CONFIG2,
129 TPS65218_CONFIG2_DC12_RST,
130 TPS65218_PROTECT_L1);
131 if (ret)
132 return ret;
133
134 break;
135 default:
136 return -EINVAL;
137 }
138
139 return 0;
140}
141
142static int tps65218_gpio_set_config(struct gpio_chip *gc, unsigned offset,
143 unsigned long config)
144{
145 struct tps65218_gpio *tps65218_gpio = gpiochip_get_data(gc);
146 struct tps65218 *tps65218 = tps65218_gpio->tps65218;
147 enum pin_config_param param = pinconf_to_config_param(config);
148
149 switch (offset) {
150 case 0:
151 case 2:
152 /* GPO1 is hardwired to be open drain */
153 if (param == PIN_CONFIG_DRIVE_OPEN_DRAIN)
154 return 0;
155 return -ENOTSUPP;
156 case 1:
157 /* GPO2 is push-pull by default, can be set as open drain. */
158 if (param == PIN_CONFIG_DRIVE_OPEN_DRAIN)
159 return tps65218_clear_bits(tps65218,
160 TPS65218_REG_CONFIG1,
161 TPS65218_CONFIG1_GPO2_BUF,
162 TPS65218_PROTECT_L1);
163 if (param == PIN_CONFIG_DRIVE_PUSH_PULL)
164 return tps65218_set_bits(tps65218,
165 TPS65218_REG_CONFIG1,
166 TPS65218_CONFIG1_GPO2_BUF,
167 TPS65218_CONFIG1_GPO2_BUF,
168 TPS65218_PROTECT_L1);
169 return -ENOTSUPP;
170 default:
171 break;
172 }
173 return -ENOTSUPP;
174}
175
176static const struct gpio_chip template_chip = {
177 .label = "gpio-tps65218",
178 .owner = THIS_MODULE,
179 .request = tps65218_gpio_request,
180 .direction_output = tps65218_gpio_output,
181 .direction_input = tps65218_gpio_input,
182 .get = tps65218_gpio_get,
183 .set = tps65218_gpio_set,
184 .set_config = tps65218_gpio_set_config,
185 .can_sleep = true,
186 .ngpio = 3,
187 .base = -1,
188};
189
190static int tps65218_gpio_probe(struct platform_device *pdev)
191{
192 struct tps65218 *tps65218 = dev_get_drvdata(pdev->dev.parent);
193 struct tps65218_gpio *tps65218_gpio;
194 int ret;
195
196 tps65218_gpio = devm_kzalloc(&pdev->dev, sizeof(*tps65218_gpio),
197 GFP_KERNEL);
198 if (!tps65218_gpio)
199 return -ENOMEM;
200
201 tps65218_gpio->tps65218 = tps65218;
202 tps65218_gpio->gpio_chip = template_chip;
203 tps65218_gpio->gpio_chip.parent = &pdev->dev;
204#ifdef CONFIG_OF_GPIO
205 tps65218_gpio->gpio_chip.of_node = pdev->dev.of_node;
206#endif
207
208 ret = devm_gpiochip_add_data(&pdev->dev, &tps65218_gpio->gpio_chip,
209 tps65218_gpio);
210 if (ret < 0) {
211 dev_err(&pdev->dev, "Failed to register gpiochip, %d\n", ret);
212 return ret;
213 }
214
215 platform_set_drvdata(pdev, tps65218_gpio);
216
217 return ret;
218}
219
220static const struct of_device_id tps65218_dt_match[] = {
221 { .compatible = "ti,tps65218-gpio" },
222 { }
223};
224MODULE_DEVICE_TABLE(of, tps65218_dt_match);
225
226static const struct platform_device_id tps65218_gpio_id_table[] = {
227 { "tps65218-gpio", },
228 { /* sentinel */ }
229};
230MODULE_DEVICE_TABLE(platform, tps65218_gpio_id_table);
231
232static struct platform_driver tps65218_gpio_driver = {
233 .driver = {
234 .name = "tps65218-gpio",
235 .of_match_table = of_match_ptr(tps65218_dt_match)
236 },
237 .probe = tps65218_gpio_probe,
238 .id_table = tps65218_gpio_id_table,
239};
240
241module_platform_driver(tps65218_gpio_driver);
242
243MODULE_AUTHOR("Nicolas Saenz Julienne <nicolassaenzj@gmail.com>");
244MODULE_DESCRIPTION("GPO interface for TPS65218 PMICs");
245MODULE_LICENSE("GPL v2");
246MODULE_ALIAS("platform:tps65218-gpio");
247