| /* |
| * Copyright (C) 2014 Motorola Mobility LLC |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| * 02111-1307, USA |
| */ |
| #include <linux/gpio.h> |
| #include <linux/module.h> |
| #include <linux/of.h> |
| #include <linux/of_gpio.h> |
| #include <linux/platform_device.h> |
| #include <linux/slab.h> |
| |
| struct bq5105x_ctrl_info { |
| int num_gpios; |
| struct gpio *list; |
| }; |
| |
| static struct bq5105x_ctrl_info *of_bq5105x_ctrl(struct platform_device *pdev) |
| { |
| struct device_node *np = pdev->dev.of_node; |
| struct bq5105x_ctrl_info *info; |
| int i, gpio_count; |
| enum of_gpio_flags flags; |
| |
| if (!np) { |
| dev_err(&pdev->dev, "devtree data not found\n"); |
| return NULL; |
| } |
| |
| gpio_count = of_gpio_count(np); |
| |
| if (gpio_count <= 0) { |
| dev_err(&pdev->dev, "no GPIOS defined\n"); |
| return NULL; |
| } |
| |
| /* Make sure number of GPIOs defined matches the supplied number of |
| * GPIO name strings. |
| */ |
| if (gpio_count != of_property_count_strings(np, "gpio-names")) { |
| dev_err(&pdev->dev, "number of GPIOs and names mismatch\n"); |
| return NULL; |
| } |
| |
| info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL); |
| if (!info) |
| return NULL; |
| |
| info->list = devm_kzalloc(&pdev->dev, |
| sizeof(struct gpio) * gpio_count, |
| GFP_KERNEL); |
| if (!info->list) |
| return NULL; |
| |
| info->num_gpios = gpio_count; |
| for (i = 0; i < gpio_count; i++) { |
| info->list[i].gpio = of_get_gpio_flags(np, i, &flags); |
| info->list[i].flags = flags; |
| of_property_read_string_index(np, "gpio-names", i, |
| &info->list[i].label); |
| dev_dbg(&pdev->dev, "GPIO: %d FLAGS: %ld LABEL: %s\n", |
| info->list[i].gpio, info->list[i].flags, |
| info->list[i].label); |
| } |
| |
| return info; |
| } |
| |
| static int bq5105x_ctrl_probe(struct platform_device *pdev) |
| { |
| struct bq5105x_ctrl_info *info; |
| int ret; |
| int i; |
| |
| info = of_bq5105x_ctrl(pdev); |
| if (!info) { |
| dev_err(&pdev->dev, "failed to parse devtree node\n"); |
| return -ENODEV; |
| } |
| |
| ret = gpio_request_array(info->list, info->num_gpios); |
| if (ret) { |
| dev_err(&pdev->dev, "failed to request GPIOs\n"); |
| return ret; |
| } |
| |
| for (i = 0; i < info->num_gpios; i++) { |
| ret = gpio_export(info->list[i].gpio, false); |
| if (ret) { |
| dev_err(&pdev->dev, "Failed to export GPIO %s: %d\n", |
| info->list[i].label, info->list[i].gpio); |
| goto fail; |
| } |
| |
| ret = gpio_export_link(&pdev->dev, info->list[i].label, |
| info->list[i].gpio); |
| if (ret) { |
| dev_err(&pdev->dev, "failed to link GPIO %s: %d\n", |
| info->list[i].label, info->list[i].gpio); |
| goto fail; |
| } |
| } |
| |
| platform_set_drvdata(pdev, info); |
| |
| return 0; |
| |
| fail: |
| gpio_free_array(info->list, info->num_gpios); |
| return ret; |
| } |
| |
| static int bq5105x_ctrl_remove(struct platform_device *pdev) |
| { |
| struct bq5105x_ctrl_info *info = platform_get_drvdata(pdev); |
| |
| gpio_free_array(info->list, info->num_gpios); |
| platform_set_drvdata(pdev, NULL); |
| |
| return 0; |
| } |
| |
| static const struct of_device_id bq5105x_ctrl_of_tbl[] = { |
| { .compatible = "ti,bq5105x-control", }, |
| { }, |
| }; |
| MODULE_DEVICE_TABLE(of, bq5105x_ctrl_of_tbl); |
| |
| static struct platform_driver bq5105x_ctrl_driver = { |
| .probe = bq5105x_ctrl_probe, |
| .remove = bq5105x_ctrl_remove, |
| .driver = { |
| .name = "bq5105x_ctrl", |
| .owner = THIS_MODULE, |
| .of_match_table = bq5105x_ctrl_of_tbl, |
| }, |
| }; |
| |
| module_platform_driver(bq5105x_ctrl_driver); |
| |
| MODULE_ALIAS("platform:bq5105x_ctrl"); |
| MODULE_AUTHOR("Motorola Mobility LLC"); |
| MODULE_DESCRIPTION("BQ5105x Control Driver"); |
| MODULE_LICENSE("GPL"); |