2 * TI Palma series PMIC's GPIO driver.
4 * Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved.
6 * Author: Laxman Dewangan <ldewangan@nvidia.com>
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.
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
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/>.
21 #include <linux/gpio.h>
22 #include <linux/kernel.h>
23 #include <linux/module.h>
24 #include <linux/mfd/palmas.h>
26 #include <linux/of_device.h>
27 #include <linux/platform_device.h>
30 struct gpio_chip gpio_chip;
31 struct palmas *palmas;
34 struct palmas_device_data {
38 static inline struct palmas_gpio *to_palmas_gpio(struct gpio_chip *chip)
40 return container_of(chip, struct palmas_gpio, gpio_chip);
43 static int palmas_gpio_get(struct gpio_chip *gc, unsigned offset)
45 struct palmas_gpio *pg = to_palmas_gpio(gc);
46 struct palmas *palmas = pg->palmas;
50 int gpio16 = (offset/8);
53 reg = (gpio16) ? PALMAS_GPIO_DATA_DIR2 : PALMAS_GPIO_DATA_DIR;
55 ret = palmas_read(palmas, PALMAS_GPIO_BASE, reg, &val);
57 dev_err(gc->parent, "Reg 0x%02x read failed, %d\n", reg, ret);
61 if (val & BIT(offset))
62 reg = (gpio16) ? PALMAS_GPIO_DATA_OUT2 : PALMAS_GPIO_DATA_OUT;
64 reg = (gpio16) ? PALMAS_GPIO_DATA_IN2 : PALMAS_GPIO_DATA_IN;
66 ret = palmas_read(palmas, PALMAS_GPIO_BASE, reg, &val);
68 dev_err(gc->parent, "Reg 0x%02x read failed, %d\n", reg, ret);
71 return !!(val & BIT(offset));
74 static void palmas_gpio_set(struct gpio_chip *gc, unsigned offset,
77 struct palmas_gpio *pg = to_palmas_gpio(gc);
78 struct palmas *palmas = pg->palmas;
81 int gpio16 = (offset/8);
86 PALMAS_GPIO_SET_DATA_OUT2 : PALMAS_GPIO_CLEAR_DATA_OUT2;
89 PALMAS_GPIO_SET_DATA_OUT : PALMAS_GPIO_CLEAR_DATA_OUT;
91 ret = palmas_write(palmas, PALMAS_GPIO_BASE, reg, BIT(offset));
93 dev_err(gc->parent, "Reg 0x%02x write failed, %d\n", reg, ret);
96 static int palmas_gpio_output(struct gpio_chip *gc, unsigned offset,
99 struct palmas_gpio *pg = to_palmas_gpio(gc);
100 struct palmas *palmas = pg->palmas;
103 int gpio16 = (offset/8);
106 reg = (gpio16) ? PALMAS_GPIO_DATA_DIR2 : PALMAS_GPIO_DATA_DIR;
108 /* Set the initial value */
109 palmas_gpio_set(gc, offset, value);
111 ret = palmas_update_bits(palmas, PALMAS_GPIO_BASE, reg,
112 BIT(offset), BIT(offset));
114 dev_err(gc->parent, "Reg 0x%02x update failed, %d\n", reg,
119 static int palmas_gpio_input(struct gpio_chip *gc, unsigned offset)
121 struct palmas_gpio *pg = to_palmas_gpio(gc);
122 struct palmas *palmas = pg->palmas;
125 int gpio16 = (offset/8);
128 reg = (gpio16) ? PALMAS_GPIO_DATA_DIR2 : PALMAS_GPIO_DATA_DIR;
130 ret = palmas_update_bits(palmas, PALMAS_GPIO_BASE, reg, BIT(offset), 0);
132 dev_err(gc->parent, "Reg 0x%02x update failed, %d\n", reg,
137 static int palmas_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
139 struct palmas_gpio *pg = to_palmas_gpio(gc);
140 struct palmas *palmas = pg->palmas;
142 return palmas_irq_get_virq(palmas, PALMAS_GPIO_0_IRQ + offset);
145 static const struct palmas_device_data palmas_dev_data = {
149 static const struct palmas_device_data tps80036_dev_data = {
153 static const struct of_device_id of_palmas_gpio_match[] = {
154 { .compatible = "ti,palmas-gpio", .data = &palmas_dev_data,},
155 { .compatible = "ti,tps65913-gpio", .data = &palmas_dev_data,},
156 { .compatible = "ti,tps65914-gpio", .data = &palmas_dev_data,},
157 { .compatible = "ti,tps80036-gpio", .data = &tps80036_dev_data,},
160 MODULE_DEVICE_TABLE(of, of_palmas_gpio_match);
162 static int palmas_gpio_probe(struct platform_device *pdev)
164 struct palmas *palmas = dev_get_drvdata(pdev->dev.parent);
165 struct palmas_platform_data *palmas_pdata;
166 struct palmas_gpio *palmas_gpio;
168 const struct of_device_id *match;
169 const struct palmas_device_data *dev_data;
171 match = of_match_device(of_palmas_gpio_match, &pdev->dev);
174 dev_data = match->data;
176 dev_data = &palmas_dev_data;
178 palmas_gpio = devm_kzalloc(&pdev->dev,
179 sizeof(*palmas_gpio), GFP_KERNEL);
183 palmas_gpio->palmas = palmas;
184 palmas_gpio->gpio_chip.owner = THIS_MODULE;
185 palmas_gpio->gpio_chip.label = dev_name(&pdev->dev);
186 palmas_gpio->gpio_chip.ngpio = dev_data->ngpio;
187 palmas_gpio->gpio_chip.can_sleep = true;
188 palmas_gpio->gpio_chip.direction_input = palmas_gpio_input;
189 palmas_gpio->gpio_chip.direction_output = palmas_gpio_output;
190 palmas_gpio->gpio_chip.to_irq = palmas_gpio_to_irq;
191 palmas_gpio->gpio_chip.set = palmas_gpio_set;
192 palmas_gpio->gpio_chip.get = palmas_gpio_get;
193 palmas_gpio->gpio_chip.parent = &pdev->dev;
194 #ifdef CONFIG_OF_GPIO
195 palmas_gpio->gpio_chip.of_node = pdev->dev.of_node;
197 palmas_pdata = dev_get_platdata(palmas->dev);
198 if (palmas_pdata && palmas_pdata->gpio_base)
199 palmas_gpio->gpio_chip.base = palmas_pdata->gpio_base;
201 palmas_gpio->gpio_chip.base = -1;
203 ret = gpiochip_add(&palmas_gpio->gpio_chip);
205 dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
209 platform_set_drvdata(pdev, palmas_gpio);
213 static int palmas_gpio_remove(struct platform_device *pdev)
215 struct palmas_gpio *palmas_gpio = platform_get_drvdata(pdev);
217 gpiochip_remove(&palmas_gpio->gpio_chip);
221 static struct platform_driver palmas_gpio_driver = {
222 .driver.name = "palmas-gpio",
223 .driver.owner = THIS_MODULE,
224 .driver.of_match_table = of_palmas_gpio_match,
225 .probe = palmas_gpio_probe,
226 .remove = palmas_gpio_remove,
229 static int __init palmas_gpio_init(void)
231 return platform_driver_register(&palmas_gpio_driver);
233 subsys_initcall(palmas_gpio_init);
235 static void __exit palmas_gpio_exit(void)
237 platform_driver_unregister(&palmas_gpio_driver);
239 module_exit(palmas_gpio_exit);
241 MODULE_ALIAS("platform:palmas-gpio");
242 MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
243 MODULE_DESCRIPTION("GPIO driver for TI Palmas series PMICs");
244 MODULE_LICENSE("GPL v2");