Loading...
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2017 Texas Instruments Incorporated - http://www.ti.com/
4 * Keerthy <j-keerthy@ti.com>
5 *
6 * Based on the LP873X driver
7 */
8
9#include <linux/gpio/driver.h>
10#include <linux/module.h>
11#include <linux/platform_device.h>
12#include <linux/regmap.h>
13
14#include <linux/mfd/lp87565.h>
15
16struct lp87565_gpio {
17 struct gpio_chip chip;
18 struct regmap *map;
19};
20
21static int lp87565_gpio_get(struct gpio_chip *chip, unsigned int offset)
22{
23 struct lp87565_gpio *gpio = gpiochip_get_data(chip);
24 int ret, val;
25
26 ret = regmap_read(gpio->map, LP87565_REG_GPIO_IN, &val);
27 if (ret < 0)
28 return ret;
29
30 return !!(val & BIT(offset));
31}
32
33static void lp87565_gpio_set(struct gpio_chip *chip, unsigned int offset,
34 int value)
35{
36 struct lp87565_gpio *gpio = gpiochip_get_data(chip);
37
38 regmap_update_bits(gpio->map, LP87565_REG_GPIO_OUT,
39 BIT(offset), value ? BIT(offset) : 0);
40}
41
42static int lp87565_gpio_get_direction(struct gpio_chip *chip,
43 unsigned int offset)
44{
45 struct lp87565_gpio *gpio = gpiochip_get_data(chip);
46 int ret, val;
47
48 ret = regmap_read(gpio->map, LP87565_REG_GPIO_CONFIG, &val);
49 if (ret < 0)
50 return ret;
51
52 if (val & BIT(offset))
53 return GPIO_LINE_DIRECTION_OUT;
54
55 return GPIO_LINE_DIRECTION_IN;
56}
57
58static int lp87565_gpio_direction_input(struct gpio_chip *chip,
59 unsigned int offset)
60{
61 struct lp87565_gpio *gpio = gpiochip_get_data(chip);
62
63 return regmap_update_bits(gpio->map,
64 LP87565_REG_GPIO_CONFIG,
65 BIT(offset), 0);
66}
67
68static int lp87565_gpio_direction_output(struct gpio_chip *chip,
69 unsigned int offset, int value)
70{
71 struct lp87565_gpio *gpio = gpiochip_get_data(chip);
72
73 lp87565_gpio_set(chip, offset, value);
74
75 return regmap_update_bits(gpio->map,
76 LP87565_REG_GPIO_CONFIG,
77 BIT(offset), BIT(offset));
78}
79
80static int lp87565_gpio_request(struct gpio_chip *gc, unsigned int offset)
81{
82 struct lp87565_gpio *gpio = gpiochip_get_data(gc);
83 int ret;
84
85 switch (offset) {
86 case 0:
87 case 1:
88 case 2:
89 /*
90 * MUX can program the pin to be in EN1/2/3 pin mode
91 * Or GPIO1/2/3 mode.
92 * Setup the GPIO*_SEL MUX to GPIO mode
93 */
94 ret = regmap_update_bits(gpio->map,
95 LP87565_REG_PIN_FUNCTION,
96 BIT(offset), BIT(offset));
97 if (ret)
98 return ret;
99
100 break;
101 default:
102 return -EINVAL;
103 }
104
105 return 0;
106}
107
108static int lp87565_gpio_set_config(struct gpio_chip *gc, unsigned int offset,
109 unsigned long config)
110{
111 struct lp87565_gpio *gpio = gpiochip_get_data(gc);
112
113 switch (pinconf_to_config_param(config)) {
114 case PIN_CONFIG_DRIVE_OPEN_DRAIN:
115 return regmap_update_bits(gpio->map,
116 LP87565_REG_GPIO_CONFIG,
117 BIT(offset +
118 __ffs(LP87565_GPIO1_OD)),
119 BIT(offset +
120 __ffs(LP87565_GPIO1_OD)));
121 case PIN_CONFIG_DRIVE_PUSH_PULL:
122 return regmap_update_bits(gpio->map,
123 LP87565_REG_GPIO_CONFIG,
124 BIT(offset +
125 __ffs(LP87565_GPIO1_OD)), 0);
126 default:
127 return -ENOTSUPP;
128 }
129}
130
131static const struct gpio_chip template_chip = {
132 .label = "lp87565-gpio",
133 .owner = THIS_MODULE,
134 .request = lp87565_gpio_request,
135 .get_direction = lp87565_gpio_get_direction,
136 .direction_input = lp87565_gpio_direction_input,
137 .direction_output = lp87565_gpio_direction_output,
138 .get = lp87565_gpio_get,
139 .set = lp87565_gpio_set,
140 .set_config = lp87565_gpio_set_config,
141 .base = -1,
142 .ngpio = 3,
143 .can_sleep = true,
144};
145
146static int lp87565_gpio_probe(struct platform_device *pdev)
147{
148 struct lp87565_gpio *gpio;
149 struct lp87565 *lp87565;
150 int ret;
151
152 gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
153 if (!gpio)
154 return -ENOMEM;
155
156 lp87565 = dev_get_drvdata(pdev->dev.parent);
157 gpio->chip = template_chip;
158 gpio->chip.parent = lp87565->dev;
159 gpio->map = lp87565->regmap;
160
161 ret = devm_gpiochip_add_data(&pdev->dev, &gpio->chip, gpio);
162 if (ret < 0) {
163 dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
164 return ret;
165 }
166
167 return 0;
168}
169
170static const struct platform_device_id lp87565_gpio_id_table[] = {
171 { "lp87565-q1-gpio", },
172 { /* sentinel */ }
173};
174MODULE_DEVICE_TABLE(platform, lp87565_gpio_id_table);
175
176static struct platform_driver lp87565_gpio_driver = {
177 .driver = {
178 .name = "lp87565-gpio",
179 },
180 .probe = lp87565_gpio_probe,
181 .id_table = lp87565_gpio_id_table,
182};
183module_platform_driver(lp87565_gpio_driver);
184
185MODULE_AUTHOR("Keerthy <j-keerthy@ti.com>");
186MODULE_DESCRIPTION("LP87565 GPIO driver");
187MODULE_LICENSE("GPL v2");
1/*
2 * Copyright (C) 2017 Texas Instruments Incorporated - http://www.ti.com/
3 * Keerthy <j-keerthy@ti.com>
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed "as is" WITHOUT ANY WARRANTY of any
10 * kind, whether expressed or implied; without even the implied warranty
11 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License version 2 for more details.
13 *
14 * Based on the LP873X driver
15 */
16
17#include <linux/gpio/driver.h>
18#include <linux/module.h>
19#include <linux/platform_device.h>
20#include <linux/regmap.h>
21
22#include <linux/mfd/lp87565.h>
23
24struct lp87565_gpio {
25 struct gpio_chip chip;
26 struct regmap *map;
27};
28
29static int lp87565_gpio_get(struct gpio_chip *chip, unsigned int offset)
30{
31 struct lp87565_gpio *gpio = gpiochip_get_data(chip);
32 int ret, val;
33
34 ret = regmap_read(gpio->map, LP87565_REG_GPIO_IN, &val);
35 if (ret < 0)
36 return ret;
37
38 return !!(val & BIT(offset));
39}
40
41static void lp87565_gpio_set(struct gpio_chip *chip, unsigned int offset,
42 int value)
43{
44 struct lp87565_gpio *gpio = gpiochip_get_data(chip);
45
46 regmap_update_bits(gpio->map, LP87565_REG_GPIO_OUT,
47 BIT(offset), value ? BIT(offset) : 0);
48}
49
50static int lp87565_gpio_get_direction(struct gpio_chip *chip,
51 unsigned int offset)
52{
53 struct lp87565_gpio *gpio = gpiochip_get_data(chip);
54 int ret, val;
55
56 ret = regmap_read(gpio->map, LP87565_REG_GPIO_CONFIG, &val);
57 if (ret < 0)
58 return ret;
59
60 if (val & BIT(offset))
61 return GPIO_LINE_DIRECTION_OUT;
62
63 return GPIO_LINE_DIRECTION_IN;
64}
65
66static int lp87565_gpio_direction_input(struct gpio_chip *chip,
67 unsigned int offset)
68{
69 struct lp87565_gpio *gpio = gpiochip_get_data(chip);
70
71 return regmap_update_bits(gpio->map,
72 LP87565_REG_GPIO_CONFIG,
73 BIT(offset), 0);
74}
75
76static int lp87565_gpio_direction_output(struct gpio_chip *chip,
77 unsigned int offset, int value)
78{
79 struct lp87565_gpio *gpio = gpiochip_get_data(chip);
80
81 lp87565_gpio_set(chip, offset, value);
82
83 return regmap_update_bits(gpio->map,
84 LP87565_REG_GPIO_CONFIG,
85 BIT(offset), BIT(offset));
86}
87
88static int lp87565_gpio_request(struct gpio_chip *gc, unsigned int offset)
89{
90 struct lp87565_gpio *gpio = gpiochip_get_data(gc);
91 int ret;
92
93 switch (offset) {
94 case 0:
95 case 1:
96 case 2:
97 /*
98 * MUX can program the pin to be in EN1/2/3 pin mode
99 * Or GPIO1/2/3 mode.
100 * Setup the GPIO*_SEL MUX to GPIO mode
101 */
102 ret = regmap_update_bits(gpio->map,
103 LP87565_REG_PIN_FUNCTION,
104 BIT(offset), BIT(offset));
105 if (ret)
106 return ret;
107
108 break;
109 default:
110 return -EINVAL;
111 }
112
113 return 0;
114}
115
116static int lp87565_gpio_set_config(struct gpio_chip *gc, unsigned int offset,
117 unsigned long config)
118{
119 struct lp87565_gpio *gpio = gpiochip_get_data(gc);
120
121 switch (pinconf_to_config_param(config)) {
122 case PIN_CONFIG_DRIVE_OPEN_DRAIN:
123 return regmap_update_bits(gpio->map,
124 LP87565_REG_GPIO_CONFIG,
125 BIT(offset +
126 __ffs(LP87565_GOIO1_OD)),
127 BIT(offset +
128 __ffs(LP87565_GOIO1_OD)));
129 case PIN_CONFIG_DRIVE_PUSH_PULL:
130 return regmap_update_bits(gpio->map,
131 LP87565_REG_GPIO_CONFIG,
132 BIT(offset +
133 __ffs(LP87565_GOIO1_OD)), 0);
134 default:
135 return -ENOTSUPP;
136 }
137}
138
139static const struct gpio_chip template_chip = {
140 .label = "lp87565-gpio",
141 .owner = THIS_MODULE,
142 .request = lp87565_gpio_request,
143 .get_direction = lp87565_gpio_get_direction,
144 .direction_input = lp87565_gpio_direction_input,
145 .direction_output = lp87565_gpio_direction_output,
146 .get = lp87565_gpio_get,
147 .set = lp87565_gpio_set,
148 .set_config = lp87565_gpio_set_config,
149 .base = -1,
150 .ngpio = 3,
151 .can_sleep = true,
152};
153
154static int lp87565_gpio_probe(struct platform_device *pdev)
155{
156 struct lp87565_gpio *gpio;
157 struct lp87565 *lp87565;
158 int ret;
159
160 gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
161 if (!gpio)
162 return -ENOMEM;
163
164 lp87565 = dev_get_drvdata(pdev->dev.parent);
165 gpio->chip = template_chip;
166 gpio->chip.parent = lp87565->dev;
167 gpio->map = lp87565->regmap;
168
169 ret = devm_gpiochip_add_data(&pdev->dev, &gpio->chip, gpio);
170 if (ret < 0) {
171 dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
172 return ret;
173 }
174
175 return 0;
176}
177
178static const struct platform_device_id lp87565_gpio_id_table[] = {
179 { "lp87565-q1-gpio", },
180 { /* sentinel */ }
181};
182MODULE_DEVICE_TABLE(platform, lp87565_gpio_id_table);
183
184static struct platform_driver lp87565_gpio_driver = {
185 .driver = {
186 .name = "lp87565-gpio",
187 },
188 .probe = lp87565_gpio_probe,
189 .id_table = lp87565_gpio_id_table,
190};
191module_platform_driver(lp87565_gpio_driver);
192
193MODULE_AUTHOR("Keerthy <j-keerthy@ti.com>");
194MODULE_DESCRIPTION("LP87565 GPIO driver");
195MODULE_LICENSE("GPL v2");