Loading...
1/*
2 * TI Palma series PMIC's GPIO driver.
3 *
4 * Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved.
5 *
6 * Author: Laxman Dewangan <ldewangan@nvidia.com>
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms and conditions of the GNU General Public License,
10 * version 2, as published by the Free Software Foundation.
11 *
12 * This program is distributed in the hope it will be useful, but WITHOUT
13 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
15 * more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program. If not, see <http://www.gnu.org/licenses/>.
19 */
20
21#include <linux/gpio.h>
22#include <linux/kernel.h>
23#include <linux/module.h>
24#include <linux/mfd/palmas.h>
25#include <linux/of.h>
26#include <linux/of_device.h>
27#include <linux/platform_device.h>
28
29struct palmas_gpio {
30 struct gpio_chip gpio_chip;
31 struct palmas *palmas;
32};
33
34struct palmas_device_data {
35 int ngpio;
36};
37
38static inline struct palmas_gpio *to_palmas_gpio(struct gpio_chip *chip)
39{
40 return container_of(chip, struct palmas_gpio, gpio_chip);
41}
42
43static int palmas_gpio_get(struct gpio_chip *gc, unsigned offset)
44{
45 struct palmas_gpio *pg = to_palmas_gpio(gc);
46 struct palmas *palmas = pg->palmas;
47 unsigned int val;
48 int ret;
49 unsigned int reg;
50 int gpio16 = (offset/8);
51
52 offset %= 8;
53 reg = (gpio16) ? PALMAS_GPIO_DATA_DIR2 : PALMAS_GPIO_DATA_DIR;
54
55 ret = palmas_read(palmas, PALMAS_GPIO_BASE, reg, &val);
56 if (ret < 0) {
57 dev_err(gc->dev, "Reg 0x%02x read failed, %d\n", reg, ret);
58 return ret;
59 }
60
61 if (val & BIT(offset))
62 reg = (gpio16) ? PALMAS_GPIO_DATA_OUT2 : PALMAS_GPIO_DATA_OUT;
63 else
64 reg = (gpio16) ? PALMAS_GPIO_DATA_IN2 : PALMAS_GPIO_DATA_IN;
65
66 ret = palmas_read(palmas, PALMAS_GPIO_BASE, reg, &val);
67 if (ret < 0) {
68 dev_err(gc->dev, "Reg 0x%02x read failed, %d\n", reg, ret);
69 return ret;
70 }
71 return !!(val & BIT(offset));
72}
73
74static void palmas_gpio_set(struct gpio_chip *gc, unsigned offset,
75 int value)
76{
77 struct palmas_gpio *pg = to_palmas_gpio(gc);
78 struct palmas *palmas = pg->palmas;
79 int ret;
80 unsigned int reg;
81 int gpio16 = (offset/8);
82
83 offset %= 8;
84 if (gpio16)
85 reg = (value) ?
86 PALMAS_GPIO_SET_DATA_OUT2 : PALMAS_GPIO_CLEAR_DATA_OUT2;
87 else
88 reg = (value) ?
89 PALMAS_GPIO_SET_DATA_OUT : PALMAS_GPIO_CLEAR_DATA_OUT;
90
91 ret = palmas_write(palmas, PALMAS_GPIO_BASE, reg, BIT(offset));
92 if (ret < 0)
93 dev_err(gc->dev, "Reg 0x%02x write failed, %d\n", reg, ret);
94}
95
96static int palmas_gpio_output(struct gpio_chip *gc, unsigned offset,
97 int value)
98{
99 struct palmas_gpio *pg = to_palmas_gpio(gc);
100 struct palmas *palmas = pg->palmas;
101 int ret;
102 unsigned int reg;
103 int gpio16 = (offset/8);
104
105 offset %= 8;
106 reg = (gpio16) ? PALMAS_GPIO_DATA_DIR2 : PALMAS_GPIO_DATA_DIR;
107
108 /* Set the initial value */
109 palmas_gpio_set(gc, offset, value);
110
111 ret = palmas_update_bits(palmas, PALMAS_GPIO_BASE, reg,
112 BIT(offset), BIT(offset));
113 if (ret < 0)
114 dev_err(gc->dev, "Reg 0x%02x update failed, %d\n", reg, ret);
115 return ret;
116}
117
118static int palmas_gpio_input(struct gpio_chip *gc, unsigned offset)
119{
120 struct palmas_gpio *pg = to_palmas_gpio(gc);
121 struct palmas *palmas = pg->palmas;
122 int ret;
123 unsigned int reg;
124 int gpio16 = (offset/8);
125
126 offset %= 8;
127 reg = (gpio16) ? PALMAS_GPIO_DATA_DIR2 : PALMAS_GPIO_DATA_DIR;
128
129 ret = palmas_update_bits(palmas, PALMAS_GPIO_BASE, reg, BIT(offset), 0);
130 if (ret < 0)
131 dev_err(gc->dev, "Reg 0x%02x update failed, %d\n", reg, ret);
132 return ret;
133}
134
135static int palmas_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
136{
137 struct palmas_gpio *pg = to_palmas_gpio(gc);
138 struct palmas *palmas = pg->palmas;
139
140 return palmas_irq_get_virq(palmas, PALMAS_GPIO_0_IRQ + offset);
141}
142
143static const struct palmas_device_data palmas_dev_data = {
144 .ngpio = 8,
145};
146
147static const struct palmas_device_data tps80036_dev_data = {
148 .ngpio = 16,
149};
150
151static struct of_device_id of_palmas_gpio_match[] = {
152 { .compatible = "ti,palmas-gpio", .data = &palmas_dev_data,},
153 { .compatible = "ti,tps65913-gpio", .data = &palmas_dev_data,},
154 { .compatible = "ti,tps65914-gpio", .data = &palmas_dev_data,},
155 { .compatible = "ti,tps80036-gpio", .data = &tps80036_dev_data,},
156 { },
157};
158MODULE_DEVICE_TABLE(of, of_palmas_gpio_match);
159
160static int palmas_gpio_probe(struct platform_device *pdev)
161{
162 struct palmas *palmas = dev_get_drvdata(pdev->dev.parent);
163 struct palmas_platform_data *palmas_pdata;
164 struct palmas_gpio *palmas_gpio;
165 int ret;
166 const struct of_device_id *match;
167 const struct palmas_device_data *dev_data;
168
169 match = of_match_device(of_palmas_gpio_match, &pdev->dev);
170 dev_data = match->data;
171 if (!dev_data)
172 dev_data = &palmas_dev_data;
173
174 palmas_gpio = devm_kzalloc(&pdev->dev,
175 sizeof(*palmas_gpio), GFP_KERNEL);
176 if (!palmas_gpio) {
177 dev_err(&pdev->dev, "Could not allocate palmas_gpio\n");
178 return -ENOMEM;
179 }
180
181 palmas_gpio->palmas = palmas;
182 palmas_gpio->gpio_chip.owner = THIS_MODULE;
183 palmas_gpio->gpio_chip.label = dev_name(&pdev->dev);
184 palmas_gpio->gpio_chip.ngpio = dev_data->ngpio;
185 palmas_gpio->gpio_chip.can_sleep = true;
186 palmas_gpio->gpio_chip.direction_input = palmas_gpio_input;
187 palmas_gpio->gpio_chip.direction_output = palmas_gpio_output;
188 palmas_gpio->gpio_chip.to_irq = palmas_gpio_to_irq;
189 palmas_gpio->gpio_chip.set = palmas_gpio_set;
190 palmas_gpio->gpio_chip.get = palmas_gpio_get;
191 palmas_gpio->gpio_chip.dev = &pdev->dev;
192#ifdef CONFIG_OF_GPIO
193 palmas_gpio->gpio_chip.of_node = pdev->dev.of_node;
194#endif
195 palmas_pdata = dev_get_platdata(palmas->dev);
196 if (palmas_pdata && palmas_pdata->gpio_base)
197 palmas_gpio->gpio_chip.base = palmas_pdata->gpio_base;
198 else
199 palmas_gpio->gpio_chip.base = -1;
200
201 ret = gpiochip_add(&palmas_gpio->gpio_chip);
202 if (ret < 0) {
203 dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
204 return ret;
205 }
206
207 platform_set_drvdata(pdev, palmas_gpio);
208 return ret;
209}
210
211static int palmas_gpio_remove(struct platform_device *pdev)
212{
213 struct palmas_gpio *palmas_gpio = platform_get_drvdata(pdev);
214
215 return gpiochip_remove(&palmas_gpio->gpio_chip);
216}
217
218static struct platform_driver palmas_gpio_driver = {
219 .driver.name = "palmas-gpio",
220 .driver.owner = THIS_MODULE,
221 .driver.of_match_table = of_palmas_gpio_match,
222 .probe = palmas_gpio_probe,
223 .remove = palmas_gpio_remove,
224};
225
226static int __init palmas_gpio_init(void)
227{
228 return platform_driver_register(&palmas_gpio_driver);
229}
230subsys_initcall(palmas_gpio_init);
231
232static void __exit palmas_gpio_exit(void)
233{
234 platform_driver_unregister(&palmas_gpio_driver);
235}
236module_exit(palmas_gpio_exit);
237
238MODULE_ALIAS("platform:palmas-gpio");
239MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
240MODULE_DESCRIPTION("GPIO driver for TI Palmas series PMICs");
241MODULE_LICENSE("GPL v2");
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * TI Palma series PMIC's GPIO driver.
4 *
5 * Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved.
6 *
7 * Author: Laxman Dewangan <ldewangan@nvidia.com>
8 */
9
10#include <linux/gpio/driver.h>
11#include <linux/kernel.h>
12#include <linux/init.h>
13#include <linux/mfd/palmas.h>
14#include <linux/of.h>
15#include <linux/platform_device.h>
16
17struct palmas_gpio {
18 struct gpio_chip gpio_chip;
19 struct palmas *palmas;
20};
21
22struct palmas_device_data {
23 int ngpio;
24};
25
26static int palmas_gpio_get(struct gpio_chip *gc, unsigned offset)
27{
28 struct palmas_gpio *pg = gpiochip_get_data(gc);
29 struct palmas *palmas = pg->palmas;
30 unsigned int val;
31 int ret;
32 unsigned int reg;
33 int gpio16 = (offset/8);
34
35 offset %= 8;
36 reg = (gpio16) ? PALMAS_GPIO_DATA_DIR2 : PALMAS_GPIO_DATA_DIR;
37
38 ret = palmas_read(palmas, PALMAS_GPIO_BASE, reg, &val);
39 if (ret < 0) {
40 dev_err(gc->parent, "Reg 0x%02x read failed, %d\n", reg, ret);
41 return ret;
42 }
43
44 if (val & BIT(offset))
45 reg = (gpio16) ? PALMAS_GPIO_DATA_OUT2 : PALMAS_GPIO_DATA_OUT;
46 else
47 reg = (gpio16) ? PALMAS_GPIO_DATA_IN2 : PALMAS_GPIO_DATA_IN;
48
49 ret = palmas_read(palmas, PALMAS_GPIO_BASE, reg, &val);
50 if (ret < 0) {
51 dev_err(gc->parent, "Reg 0x%02x read failed, %d\n", reg, ret);
52 return ret;
53 }
54 return !!(val & BIT(offset));
55}
56
57static void palmas_gpio_set(struct gpio_chip *gc, unsigned offset,
58 int value)
59{
60 struct palmas_gpio *pg = gpiochip_get_data(gc);
61 struct palmas *palmas = pg->palmas;
62 int ret;
63 unsigned int reg;
64 int gpio16 = (offset/8);
65
66 offset %= 8;
67 if (gpio16)
68 reg = (value) ?
69 PALMAS_GPIO_SET_DATA_OUT2 : PALMAS_GPIO_CLEAR_DATA_OUT2;
70 else
71 reg = (value) ?
72 PALMAS_GPIO_SET_DATA_OUT : PALMAS_GPIO_CLEAR_DATA_OUT;
73
74 ret = palmas_write(palmas, PALMAS_GPIO_BASE, reg, BIT(offset));
75 if (ret < 0)
76 dev_err(gc->parent, "Reg 0x%02x write failed, %d\n", reg, ret);
77}
78
79static int palmas_gpio_output(struct gpio_chip *gc, unsigned offset,
80 int value)
81{
82 struct palmas_gpio *pg = gpiochip_get_data(gc);
83 struct palmas *palmas = pg->palmas;
84 int ret;
85 unsigned int reg;
86 int gpio16 = (offset/8);
87
88 offset %= 8;
89 reg = (gpio16) ? PALMAS_GPIO_DATA_DIR2 : PALMAS_GPIO_DATA_DIR;
90
91 /* Set the initial value */
92 palmas_gpio_set(gc, offset, value);
93
94 ret = palmas_update_bits(palmas, PALMAS_GPIO_BASE, reg,
95 BIT(offset), BIT(offset));
96 if (ret < 0)
97 dev_err(gc->parent, "Reg 0x%02x update failed, %d\n", reg,
98 ret);
99 return ret;
100}
101
102static int palmas_gpio_input(struct gpio_chip *gc, unsigned offset)
103{
104 struct palmas_gpio *pg = gpiochip_get_data(gc);
105 struct palmas *palmas = pg->palmas;
106 int ret;
107 unsigned int reg;
108 int gpio16 = (offset/8);
109
110 offset %= 8;
111 reg = (gpio16) ? PALMAS_GPIO_DATA_DIR2 : PALMAS_GPIO_DATA_DIR;
112
113 ret = palmas_update_bits(palmas, PALMAS_GPIO_BASE, reg, BIT(offset), 0);
114 if (ret < 0)
115 dev_err(gc->parent, "Reg 0x%02x update failed, %d\n", reg,
116 ret);
117 return ret;
118}
119
120static int palmas_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
121{
122 struct palmas_gpio *pg = gpiochip_get_data(gc);
123 struct palmas *palmas = pg->palmas;
124
125 return palmas_irq_get_virq(palmas, PALMAS_GPIO_0_IRQ + offset);
126}
127
128static const struct palmas_device_data palmas_dev_data = {
129 .ngpio = 8,
130};
131
132static const struct palmas_device_data tps80036_dev_data = {
133 .ngpio = 16,
134};
135
136static const struct of_device_id of_palmas_gpio_match[] = {
137 { .compatible = "ti,palmas-gpio", .data = &palmas_dev_data,},
138 { .compatible = "ti,tps65913-gpio", .data = &palmas_dev_data,},
139 { .compatible = "ti,tps65914-gpio", .data = &palmas_dev_data,},
140 { .compatible = "ti,tps80036-gpio", .data = &tps80036_dev_data,},
141 { },
142};
143
144static int palmas_gpio_probe(struct platform_device *pdev)
145{
146 struct palmas *palmas = dev_get_drvdata(pdev->dev.parent);
147 struct palmas_platform_data *palmas_pdata;
148 struct palmas_gpio *palmas_gpio;
149 int ret;
150 const struct palmas_device_data *dev_data;
151
152 dev_data = of_device_get_match_data(&pdev->dev);
153 if (!dev_data)
154 dev_data = &palmas_dev_data;
155
156 palmas_gpio = devm_kzalloc(&pdev->dev,
157 sizeof(*palmas_gpio), GFP_KERNEL);
158 if (!palmas_gpio)
159 return -ENOMEM;
160
161 palmas_gpio->palmas = palmas;
162 palmas_gpio->gpio_chip.owner = THIS_MODULE;
163 palmas_gpio->gpio_chip.label = dev_name(&pdev->dev);
164 palmas_gpio->gpio_chip.ngpio = dev_data->ngpio;
165 palmas_gpio->gpio_chip.can_sleep = true;
166 palmas_gpio->gpio_chip.direction_input = palmas_gpio_input;
167 palmas_gpio->gpio_chip.direction_output = palmas_gpio_output;
168 palmas_gpio->gpio_chip.to_irq = palmas_gpio_to_irq;
169 palmas_gpio->gpio_chip.set = palmas_gpio_set;
170 palmas_gpio->gpio_chip.get = palmas_gpio_get;
171 palmas_gpio->gpio_chip.parent = &pdev->dev;
172
173 palmas_pdata = dev_get_platdata(palmas->dev);
174 if (palmas_pdata && palmas_pdata->gpio_base)
175 palmas_gpio->gpio_chip.base = palmas_pdata->gpio_base;
176 else
177 palmas_gpio->gpio_chip.base = -1;
178
179 ret = devm_gpiochip_add_data(&pdev->dev, &palmas_gpio->gpio_chip,
180 palmas_gpio);
181 if (ret < 0) {
182 dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
183 return ret;
184 }
185
186 return ret;
187}
188
189static struct platform_driver palmas_gpio_driver = {
190 .driver.name = "palmas-gpio",
191 .driver.of_match_table = of_palmas_gpio_match,
192 .probe = palmas_gpio_probe,
193};
194
195static int __init palmas_gpio_init(void)
196{
197 return platform_driver_register(&palmas_gpio_driver);
198}
199subsys_initcall(palmas_gpio_init);