drivers/gpio/gpio-tps65910.c

0001 // SPDX-License-Identifier: GPL-2.0+
0002 /*
0003  * TI TPS6591x GPIO driver
0004  *
0005  * Copyright 2010 Texas Instruments Inc.
0006  *
0007  * Author: Graeme Gregory <gg@slimlogic.co.uk>
0008  * Author: Jorge Eduardo Candelaria <jedu@slimlogic.co.uk>
0009  */
0010
0011 #include <linux/kernel.h>
0012 #include <linux/init.h>
0013 #include <linux/errno.h>
0014 #include <linux/gpio/driver.h>
0015 #include <linux/i2c.h>
0016 #include <linux/platform_device.h>
0017 #include <linux/mfd/tps65910.h>
0018 #include <linux/of_device.h>
0019
0020 struct tps65910_gpio {
0021     struct gpio_chip gpio_chip;
0022     struct tps65910 *tps65910;
0023 };
0024
0025 static int tps65910_gpio_get(struct gpio_chip *gc, unsigned offset)
0026 {
0027     struct tps65910_gpio *tps65910_gpio = gpiochip_get_data(gc);
0028     struct tps65910 *tps65910 = tps65910_gpio->tps65910;
0029     unsigned int val;
0030
0031     regmap_read(tps65910->regmap, TPS65910_GPIO0 + offset, &val);
0032
0033     if (val & GPIO_STS_MASK)
0034         return 1;
0035
0036     return 0;
0037 }
0038
0039 static void tps65910_gpio_set(struct gpio_chip *gc, unsigned offset,
0040                   int value)
0041 {
0042     struct tps65910_gpio *tps65910_gpio = gpiochip_get_data(gc);
0043     struct tps65910 *tps65910 = tps65910_gpio->tps65910;
0044
0045     if (value)
0046         regmap_set_bits(tps65910->regmap, TPS65910_GPIO0 + offset,
0047                         GPIO_SET_MASK);
0048     else
0049         regmap_clear_bits(tps65910->regmap, TPS65910_GPIO0 + offset,
0050                         GPIO_SET_MASK);
0051 }
0052
0053 static int tps65910_gpio_output(struct gpio_chip *gc, unsigned offset,
0054                 int value)
0055 {
0056     struct tps65910_gpio *tps65910_gpio = gpiochip_get_data(gc);
0057     struct tps65910 *tps65910 = tps65910_gpio->tps65910;
0058
0059     /* Set the initial value */
0060     tps65910_gpio_set(gc, offset, value);
0061
0062     return regmap_set_bits(tps65910->regmap, TPS65910_GPIO0 + offset,
0063                         GPIO_CFG_MASK);
0064 }
0065
0066 static int tps65910_gpio_input(struct gpio_chip *gc, unsigned offset)
0067 {
0068     struct tps65910_gpio *tps65910_gpio = gpiochip_get_data(gc);
0069     struct tps65910 *tps65910 = tps65910_gpio->tps65910;
0070
0071     return regmap_clear_bits(tps65910->regmap, TPS65910_GPIO0 + offset,
0072                         GPIO_CFG_MASK);
0073 }
0074
0075 #ifdef CONFIG_OF
0076 static struct tps65910_board *tps65910_parse_dt_for_gpio(struct device *dev,
0077         struct tps65910 *tps65910, int chip_ngpio)
0078 {
0079     struct tps65910_board *tps65910_board = tps65910->of_plat_data;
0080     unsigned int prop_array[TPS6591X_MAX_NUM_GPIO];
0081     int ngpio = min(chip_ngpio, TPS6591X_MAX_NUM_GPIO);
0082     int ret;
0083     int idx;
0084
0085     tps65910_board->gpio_base = -1;
0086     ret = of_property_read_u32_array(tps65910->dev->of_node,
0087             "ti,en-gpio-sleep", prop_array, ngpio);
0088     if (ret < 0) {
0089         dev_dbg(dev, "ti,en-gpio-sleep not specified\n");
0090         return tps65910_board;
0091     }
0092
0093     for (idx = 0; idx < ngpio; idx++)
0094         tps65910_board->en_gpio_sleep[idx] = (prop_array[idx] != 0);
0095
0096     return tps65910_board;
0097 }
0098 #else
0099 static struct tps65910_board *tps65910_parse_dt_for_gpio(struct device *dev,
0100         struct tps65910 *tps65910, int chip_ngpio)
0101 {
0102     return NULL;
0103 }
0104 #endif
0105
0106 static int tps65910_gpio_probe(struct platform_device *pdev)
0107 {
0108     struct tps65910 *tps65910 = dev_get_drvdata(pdev->dev.parent);
0109     struct tps65910_board *pdata = dev_get_platdata(tps65910->dev);
0110     struct tps65910_gpio *tps65910_gpio;
0111     int ret;
0112     int i;
0113
0114     device_set_node(&pdev->dev, dev_fwnode(pdev->dev.parent));
0115
0116     tps65910_gpio = devm_kzalloc(&pdev->dev,
0117                 sizeof(*tps65910_gpio), GFP_KERNEL);
0118     if (!tps65910_gpio)
0119         return -ENOMEM;
0120
0121     tps65910_gpio->tps65910 = tps65910;
0122
0123     tps65910_gpio->gpio_chip.owner = THIS_MODULE;
0124     tps65910_gpio->gpio_chip.label = tps65910->i2c_client->name;
0125
0126     switch (tps65910_chip_id(tps65910)) {
0127     case TPS65910:
0128         tps65910_gpio->gpio_chip.ngpio = TPS65910_NUM_GPIO;
0129         break;
0130     case TPS65911:
0131         tps65910_gpio->gpio_chip.ngpio = TPS65911_NUM_GPIO;
0132         break;
0133     default:
0134         return -EINVAL;
0135     }
0136     tps65910_gpio->gpio_chip.can_sleep = true;
0137     tps65910_gpio->gpio_chip.direction_input = tps65910_gpio_input;
0138     tps65910_gpio->gpio_chip.direction_output = tps65910_gpio_output;
0139     tps65910_gpio->gpio_chip.set    = tps65910_gpio_set;
0140     tps65910_gpio->gpio_chip.get    = tps65910_gpio_get;
0141     tps65910_gpio->gpio_chip.parent = &pdev->dev;
0142
0143     if (pdata && pdata->gpio_base)
0144         tps65910_gpio->gpio_chip.base = pdata->gpio_base;
0145     else
0146         tps65910_gpio->gpio_chip.base = -1;
0147
0148     if (!pdata && tps65910->dev->of_node)
0149         pdata = tps65910_parse_dt_for_gpio(&pdev->dev, tps65910,
0150             tps65910_gpio->gpio_chip.ngpio);
0151
0152     if (!pdata)
0153         goto skip_init;
0154
0155     /* Configure sleep control for gpios if provided */
0156     for (i = 0; i < tps65910_gpio->gpio_chip.ngpio; ++i) {
0157         if (!pdata->en_gpio_sleep[i])
0158             continue;
0159
0160         ret = regmap_set_bits(tps65910->regmap,
0161             TPS65910_GPIO0 + i, GPIO_SLEEP_MASK);
0162         if (ret < 0)
0163             dev_warn(tps65910->dev,
0164                 "GPIO Sleep setting failed with err %d\n", ret);
0165     }
0166
0167 skip_init:
0168     return devm_gpiochip_add_data(&pdev->dev, &tps65910_gpio->gpio_chip,
0169                       tps65910_gpio);
0170 }
0171
0172 static struct platform_driver tps65910_gpio_driver = {
0173     .driver.name    = "tps65910-gpio",
0174     .probe      = tps65910_gpio_probe,
0175 };
0176
0177 static int __init tps65910_gpio_init(void)
0178 {
0179     return platform_driver_register(&tps65910_gpio_driver);
0180 }
0181 subsys_initcall(tps65910_gpio_init);