126a48c4cSThor Thayer /* 226a48c4cSThor Thayer * Copyright Intel Corporation (C) 2014-2016. All Rights Reserved 326a48c4cSThor Thayer * 426a48c4cSThor Thayer * This program is free software; you can redistribute it and/or modify it 526a48c4cSThor Thayer * under the terms and conditions of the GNU General Public License, 626a48c4cSThor Thayer * version 2, as published by the Free Software Foundation. 726a48c4cSThor Thayer * 826a48c4cSThor Thayer * This program is distributed in the hope it will be useful, but WITHOUT 926a48c4cSThor Thayer * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 1026a48c4cSThor Thayer * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 1126a48c4cSThor Thayer * more details. 1226a48c4cSThor Thayer * 1326a48c4cSThor Thayer * You should have received a copy of the GNU General Public License along with 1426a48c4cSThor Thayer * this program. If not, see <http://www.gnu.org/licenses/>. 1526a48c4cSThor Thayer * 1626a48c4cSThor Thayer * GPIO driver for Altera Arria10 MAX5 System Resource Chip 1726a48c4cSThor Thayer * 1826a48c4cSThor Thayer * Adapted from gpio-tps65910.c 1926a48c4cSThor Thayer */ 2026a48c4cSThor Thayer 2126a48c4cSThor Thayer #include <linux/gpio/driver.h> 2226a48c4cSThor Thayer #include <linux/mfd/altera-a10sr.h> 2326a48c4cSThor Thayer #include <linux/module.h> 2426a48c4cSThor Thayer 2526a48c4cSThor Thayer /** 2626a48c4cSThor Thayer * struct altr_a10sr_gpio - Altera Max5 GPIO device private data structure 2726a48c4cSThor Thayer * @gp: : instance of the gpio_chip 2826a48c4cSThor Thayer * @regmap: the regmap from the parent device. 2926a48c4cSThor Thayer */ 3026a48c4cSThor Thayer struct altr_a10sr_gpio { 3126a48c4cSThor Thayer struct gpio_chip gp; 3226a48c4cSThor Thayer struct regmap *regmap; 3326a48c4cSThor Thayer }; 3426a48c4cSThor Thayer 3526a48c4cSThor Thayer static int altr_a10sr_gpio_get(struct gpio_chip *chip, unsigned int offset) 3626a48c4cSThor Thayer { 3726a48c4cSThor Thayer struct altr_a10sr_gpio *gpio = gpiochip_get_data(chip); 3826a48c4cSThor Thayer int ret, val; 3926a48c4cSThor Thayer 4026a48c4cSThor Thayer ret = regmap_read(gpio->regmap, ALTR_A10SR_PBDSW_REG, &val); 4126a48c4cSThor Thayer if (ret < 0) 4226a48c4cSThor Thayer return ret; 4326a48c4cSThor Thayer 4426a48c4cSThor Thayer return !!(val & BIT(offset - ALTR_A10SR_LED_VALID_SHIFT)); 4526a48c4cSThor Thayer } 4626a48c4cSThor Thayer 4726a48c4cSThor Thayer static void altr_a10sr_gpio_set(struct gpio_chip *chip, unsigned int offset, 4826a48c4cSThor Thayer int value) 4926a48c4cSThor Thayer { 5026a48c4cSThor Thayer struct altr_a10sr_gpio *gpio = gpiochip_get_data(chip); 5126a48c4cSThor Thayer 5226a48c4cSThor Thayer regmap_update_bits(gpio->regmap, ALTR_A10SR_LED_REG, 5326a48c4cSThor Thayer BIT(ALTR_A10SR_LED_VALID_SHIFT + offset), 5426a48c4cSThor Thayer value ? BIT(ALTR_A10SR_LED_VALID_SHIFT + offset) 5526a48c4cSThor Thayer : 0); 5626a48c4cSThor Thayer } 5726a48c4cSThor Thayer 5826a48c4cSThor Thayer static int altr_a10sr_gpio_direction_input(struct gpio_chip *gc, 5926a48c4cSThor Thayer unsigned int nr) 6026a48c4cSThor Thayer { 6168b7587bSAxel Lin if (nr < (ALTR_A10SR_IN_VALID_RANGE_LO - ALTR_A10SR_LED_VALID_SHIFT)) 6226a48c4cSThor Thayer return -EINVAL; 6368b7587bSAxel Lin 6468b7587bSAxel Lin return 0; 6526a48c4cSThor Thayer } 6626a48c4cSThor Thayer 6726a48c4cSThor Thayer static int altr_a10sr_gpio_direction_output(struct gpio_chip *gc, 6826a48c4cSThor Thayer unsigned int nr, int value) 6926a48c4cSThor Thayer { 7068b7587bSAxel Lin if (nr > (ALTR_A10SR_OUT_VALID_RANGE_HI - ALTR_A10SR_LED_VALID_SHIFT)) 7168b7587bSAxel Lin return -EINVAL; 7268b7587bSAxel Lin 732095a45eSAxel Lin altr_a10sr_gpio_set(gc, nr, value); 7426a48c4cSThor Thayer return 0; 752095a45eSAxel Lin } 7626a48c4cSThor Thayer 771a20c3f8SGustavo A. R. Silva static const struct gpio_chip altr_a10sr_gc = { 7826a48c4cSThor Thayer .label = "altr_a10sr_gpio", 7926a48c4cSThor Thayer .owner = THIS_MODULE, 8026a48c4cSThor Thayer .get = altr_a10sr_gpio_get, 8126a48c4cSThor Thayer .set = altr_a10sr_gpio_set, 8226a48c4cSThor Thayer .direction_input = altr_a10sr_gpio_direction_input, 8326a48c4cSThor Thayer .direction_output = altr_a10sr_gpio_direction_output, 8426a48c4cSThor Thayer .can_sleep = true, 8526a48c4cSThor Thayer .ngpio = 12, 8626a48c4cSThor Thayer .base = -1, 8726a48c4cSThor Thayer }; 8826a48c4cSThor Thayer 8926a48c4cSThor Thayer static int altr_a10sr_gpio_probe(struct platform_device *pdev) 9026a48c4cSThor Thayer { 9126a48c4cSThor Thayer struct altr_a10sr_gpio *gpio; 9226a48c4cSThor Thayer int ret; 9326a48c4cSThor Thayer struct altr_a10sr *a10sr = dev_get_drvdata(pdev->dev.parent); 9426a48c4cSThor Thayer 9526a48c4cSThor Thayer gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL); 9626a48c4cSThor Thayer if (!gpio) 9726a48c4cSThor Thayer return -ENOMEM; 9826a48c4cSThor Thayer 9926a48c4cSThor Thayer gpio->regmap = a10sr->regmap; 10026a48c4cSThor Thayer 10126a48c4cSThor Thayer gpio->gp = altr_a10sr_gc; 1029ce9f799SThor Thayer gpio->gp.parent = pdev->dev.parent; 10326a48c4cSThor Thayer gpio->gp.of_node = pdev->dev.of_node; 10426a48c4cSThor Thayer 10526a48c4cSThor Thayer ret = devm_gpiochip_add_data(&pdev->dev, &gpio->gp, gpio); 10626a48c4cSThor Thayer if (ret < 0) { 10726a48c4cSThor Thayer dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret); 10826a48c4cSThor Thayer return ret; 10926a48c4cSThor Thayer } 11026a48c4cSThor Thayer 11126a48c4cSThor Thayer platform_set_drvdata(pdev, gpio); 11226a48c4cSThor Thayer 11326a48c4cSThor Thayer return 0; 11426a48c4cSThor Thayer } 11526a48c4cSThor Thayer 11626a48c4cSThor Thayer static const struct of_device_id altr_a10sr_gpio_of_match[] = { 11726a48c4cSThor Thayer { .compatible = "altr,a10sr-gpio" }, 11826a48c4cSThor Thayer { }, 11926a48c4cSThor Thayer }; 12026a48c4cSThor Thayer MODULE_DEVICE_TABLE(of, altr_a10sr_gpio_of_match); 12126a48c4cSThor Thayer 12226a48c4cSThor Thayer static struct platform_driver altr_a10sr_gpio_driver = { 12326a48c4cSThor Thayer .probe = altr_a10sr_gpio_probe, 12426a48c4cSThor Thayer .driver = { 12526a48c4cSThor Thayer .name = "altr_a10sr_gpio", 12626a48c4cSThor Thayer .of_match_table = of_match_ptr(altr_a10sr_gpio_of_match), 12726a48c4cSThor Thayer }, 12826a48c4cSThor Thayer }; 12926a48c4cSThor Thayer module_platform_driver(altr_a10sr_gpio_driver); 13026a48c4cSThor Thayer 13126a48c4cSThor Thayer MODULE_LICENSE("GPL v2"); 13226a48c4cSThor Thayer MODULE_AUTHOR("Thor Thayer <tthayer@opensource.altera.com>"); 13326a48c4cSThor Thayer MODULE_DESCRIPTION("Altera Arria10 System Resource Chip GPIO"); 134