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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 int palmas_gpio_get(struct gpio_chip *gc, unsigned offset)
39{
40 struct palmas_gpio *pg = gpiochip_get_data(gc);
41 struct palmas *palmas = pg->palmas;
42 unsigned int val;
43 int ret;
44 unsigned int reg;
45 int gpio16 = (offset/8);
46
47 offset %= 8;
48 reg = (gpio16) ? PALMAS_GPIO_DATA_DIR2 : PALMAS_GPIO_DATA_DIR;
49
50 ret = palmas_read(palmas, PALMAS_GPIO_BASE, reg, &val);
51 if (ret < 0) {
52 dev_err(gc->parent, "Reg 0x%02x read failed, %d\n", reg, ret);
53 return ret;
54 }
55
56 if (val & BIT(offset))
57 reg = (gpio16) ? PALMAS_GPIO_DATA_OUT2 : PALMAS_GPIO_DATA_OUT;
58 else
59 reg = (gpio16) ? PALMAS_GPIO_DATA_IN2 : PALMAS_GPIO_DATA_IN;
60
61 ret = palmas_read(palmas, PALMAS_GPIO_BASE, reg, &val);
62 if (ret < 0) {
63 dev_err(gc->parent, "Reg 0x%02x read failed, %d\n", reg, ret);
64 return ret;
65 }
66 return !!(val & BIT(offset));
67}
68
69static void palmas_gpio_set(struct gpio_chip *gc, unsigned offset,
70 int value)
71{
72 struct palmas_gpio *pg = gpiochip_get_data(gc);
73 struct palmas *palmas = pg->palmas;
74 int ret;
75 unsigned int reg;
76 int gpio16 = (offset/8);
77
78 offset %= 8;
79 if (gpio16)
80 reg = (value) ?
81 PALMAS_GPIO_SET_DATA_OUT2 : PALMAS_GPIO_CLEAR_DATA_OUT2;
82 else
83 reg = (value) ?
84 PALMAS_GPIO_SET_DATA_OUT : PALMAS_GPIO_CLEAR_DATA_OUT;
85
86 ret = palmas_write(palmas, PALMAS_GPIO_BASE, reg, BIT(offset));
87 if (ret < 0)
88 dev_err(gc->parent, "Reg 0x%02x write failed, %d\n", reg, ret);
89}
90
91static int palmas_gpio_output(struct gpio_chip *gc, unsigned offset,
92 int value)
93{
94 struct palmas_gpio *pg = gpiochip_get_data(gc);
95 struct palmas *palmas = pg->palmas;
96 int ret;
97 unsigned int reg;
98 int gpio16 = (offset/8);
99
100 offset %= 8;
101 reg = (gpio16) ? PALMAS_GPIO_DATA_DIR2 : PALMAS_GPIO_DATA_DIR;
102
103 /* Set the initial value */
104 palmas_gpio_set(gc, offset, value);
105
106 ret = palmas_update_bits(palmas, PALMAS_GPIO_BASE, reg,
107 BIT(offset), BIT(offset));
108 if (ret < 0)
109 dev_err(gc->parent, "Reg 0x%02x update failed, %d\n", reg,
110 ret);
111 return ret;
112}
113
114static int palmas_gpio_input(struct gpio_chip *gc, unsigned offset)
115{
116 struct palmas_gpio *pg = gpiochip_get_data(gc);
117 struct palmas *palmas = pg->palmas;
118 int ret;
119 unsigned int reg;
120 int gpio16 = (offset/8);
121
122 offset %= 8;
123 reg = (gpio16) ? PALMAS_GPIO_DATA_DIR2 : PALMAS_GPIO_DATA_DIR;
124
125 ret = palmas_update_bits(palmas, PALMAS_GPIO_BASE, reg, BIT(offset), 0);
126 if (ret < 0)
127 dev_err(gc->parent, "Reg 0x%02x update failed, %d\n", reg,
128 ret);
129 return ret;
130}
131
132static int palmas_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
133{
134 struct palmas_gpio *pg = gpiochip_get_data(gc);
135 struct palmas *palmas = pg->palmas;
136
137 return palmas_irq_get_virq(palmas, PALMAS_GPIO_0_IRQ + offset);
138}
139
140static const struct palmas_device_data palmas_dev_data = {
141 .ngpio = 8,
142};
143
144static const struct palmas_device_data tps80036_dev_data = {
145 .ngpio = 16,
146};
147
148static const struct of_device_id of_palmas_gpio_match[] = {
149 { .compatible = "ti,palmas-gpio", .data = &palmas_dev_data,},
150 { .compatible = "ti,tps65913-gpio", .data = &palmas_dev_data,},
151 { .compatible = "ti,tps65914-gpio", .data = &palmas_dev_data,},
152 { .compatible = "ti,tps80036-gpio", .data = &tps80036_dev_data,},
153 { },
154};
155MODULE_DEVICE_TABLE(of, of_palmas_gpio_match);
156
157static int palmas_gpio_probe(struct platform_device *pdev)
158{
159 struct palmas *palmas = dev_get_drvdata(pdev->dev.parent);
160 struct palmas_platform_data *palmas_pdata;
161 struct palmas_gpio *palmas_gpio;
162 int ret;
163 const struct of_device_id *match;
164 const struct palmas_device_data *dev_data;
165
166 match = of_match_device(of_palmas_gpio_match, &pdev->dev);
167 if (!match)
168 return -ENODEV;
169 dev_data = match->data;
170 if (!dev_data)
171 dev_data = &palmas_dev_data;
172
173 palmas_gpio = devm_kzalloc(&pdev->dev,
174 sizeof(*palmas_gpio), GFP_KERNEL);
175 if (!palmas_gpio)
176 return -ENOMEM;
177
178 palmas_gpio->palmas = palmas;
179 palmas_gpio->gpio_chip.owner = THIS_MODULE;
180 palmas_gpio->gpio_chip.label = dev_name(&pdev->dev);
181 palmas_gpio->gpio_chip.ngpio = dev_data->ngpio;
182 palmas_gpio->gpio_chip.can_sleep = true;
183 palmas_gpio->gpio_chip.direction_input = palmas_gpio_input;
184 palmas_gpio->gpio_chip.direction_output = palmas_gpio_output;
185 palmas_gpio->gpio_chip.to_irq = palmas_gpio_to_irq;
186 palmas_gpio->gpio_chip.set = palmas_gpio_set;
187 palmas_gpio->gpio_chip.get = palmas_gpio_get;
188 palmas_gpio->gpio_chip.parent = &pdev->dev;
189#ifdef CONFIG_OF_GPIO
190 palmas_gpio->gpio_chip.of_node = pdev->dev.of_node;
191#endif
192 palmas_pdata = dev_get_platdata(palmas->dev);
193 if (palmas_pdata && palmas_pdata->gpio_base)
194 palmas_gpio->gpio_chip.base = palmas_pdata->gpio_base;
195 else
196 palmas_gpio->gpio_chip.base = -1;
197
198 ret = devm_gpiochip_add_data(&pdev->dev, &palmas_gpio->gpio_chip,
199 palmas_gpio);
200 if (ret < 0) {
201 dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
202 return ret;
203 }
204
205 platform_set_drvdata(pdev, palmas_gpio);
206 return ret;
207}
208
209static struct platform_driver palmas_gpio_driver = {
210 .driver.name = "palmas-gpio",
211 .driver.owner = THIS_MODULE,
212 .driver.of_match_table = of_palmas_gpio_match,
213 .probe = palmas_gpio_probe,
214};
215
216static int __init palmas_gpio_init(void)
217{
218 return platform_driver_register(&palmas_gpio_driver);
219}
220subsys_initcall(palmas_gpio_init);
221
222static void __exit palmas_gpio_exit(void)
223{
224 platform_driver_unregister(&palmas_gpio_driver);
225}
226module_exit(palmas_gpio_exit);
227
228MODULE_ALIAS("platform:palmas-gpio");
229MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
230MODULE_DESCRIPTION("GPIO driver for TI Palmas series PMICs");
231MODULE_LICENSE("GPL v2");
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");