xref: /linux/drivers/gpio/gpio-tps65218.c (revision 2bc46b3ad3c15165f91459b07ff8682478683194)
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 
21 struct tps65218_gpio {
22 	struct tps65218 *tps65218;
23 	struct gpio_chip gpio_chip;
24 };
25 
26 static 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 
40 static 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 
57 static 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 
65 static int tps65218_gpio_input(struct gpio_chip *gc, unsigned offset)
66 {
67 	return -EPERM;
68 }
69 
70 static 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 		/* 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:
114 		if (!gpiochip_line_is_open_drain(gc, offset)) {
115 			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 
141 static 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 
175 static 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,
183 	.set_single_ended	= tps65218_gpio_set_single_ended,
184 	.can_sleep		= true,
185 	.ngpio			= 3,
186 	.base			= -1,
187 };
188 
189 static 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 
218 static 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 
227 static const struct of_device_id tps65218_dt_match[] = {
228 	{ .compatible = "ti,tps65218-gpio" },
229 	{  }
230 };
231 MODULE_DEVICE_TABLE(of, tps65218_dt_match);
232 
233 static struct platform_driver tps65218_gpio_driver = {
234 	.driver = {
235 		.name = "tps65218-gpio",
236 		.of_match_table = of_match_ptr(tps65218_dt_match)
237 	},
238 	.probe = tps65218_gpio_probe,
239 	.remove = tps65218_gpio_remove,
240 };
241 
242 module_platform_driver(tps65218_gpio_driver);
243 
244 MODULE_AUTHOR("Nicolas Saenz Julienne <nicolassaenzj@gmail.com>");
245 MODULE_DESCRIPTION("GPO interface for TPS65218 PMICs");
246 MODULE_LICENSE("GPL v2");
247 MODULE_ALIAS("platform:tps65218-gpio");
248