1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * TI TPS6586x GPIO driver 4 * 5 * Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved. 6 * Author: Laxman dewangan <ldewangan@nvidia.com> 7 * 8 * Based on tps6586x.c 9 * Copyright (c) 2010 CompuLab Ltd. 10 * Mike Rapoport <mike@compulab.co.il> 11 */ 12 13 #include <linux/errno.h> 14 #include <linux/gpio/driver.h> 15 #include <linux/kernel.h> 16 #include <linux/init.h> 17 #include <linux/mfd/tps6586x.h> 18 #include <linux/of.h> 19 #include <linux/platform_device.h> 20 21 /* GPIO control registers */ 22 #define TPS6586X_GPIOSET1 0x5d 23 #define TPS6586X_GPIOSET2 0x5e 24 25 struct tps6586x_gpio { 26 struct gpio_chip gpio_chip; 27 struct device *parent; 28 }; 29 30 static int tps6586x_gpio_get(struct gpio_chip *gc, unsigned offset) 31 { 32 struct tps6586x_gpio *tps6586x_gpio = gpiochip_get_data(gc); 33 uint8_t val; 34 int ret; 35 36 ret = tps6586x_read(tps6586x_gpio->parent, TPS6586X_GPIOSET2, &val); 37 if (ret) 38 return ret; 39 40 return !!(val & (1 << offset)); 41 } 42 43 static void tps6586x_gpio_set(struct gpio_chip *gc, unsigned offset, 44 int value) 45 { 46 struct tps6586x_gpio *tps6586x_gpio = gpiochip_get_data(gc); 47 48 tps6586x_update(tps6586x_gpio->parent, TPS6586X_GPIOSET2, 49 value << offset, 1 << offset); 50 } 51 52 static int tps6586x_gpio_output(struct gpio_chip *gc, unsigned offset, 53 int value) 54 { 55 struct tps6586x_gpio *tps6586x_gpio = gpiochip_get_data(gc); 56 uint8_t val, mask; 57 58 tps6586x_gpio_set(gc, offset, value); 59 60 val = 0x1 << (offset * 2); 61 mask = 0x3 << (offset * 2); 62 63 return tps6586x_update(tps6586x_gpio->parent, TPS6586X_GPIOSET1, 64 val, mask); 65 } 66 67 static int tps6586x_gpio_to_irq(struct gpio_chip *gc, unsigned offset) 68 { 69 struct tps6586x_gpio *tps6586x_gpio = gpiochip_get_data(gc); 70 71 return tps6586x_irq_get_virq(tps6586x_gpio->parent, 72 TPS6586X_INT_PLDO_0 + offset); 73 } 74 75 static int tps6586x_gpio_probe(struct platform_device *pdev) 76 { 77 struct tps6586x_platform_data *pdata; 78 struct tps6586x_gpio *tps6586x_gpio; 79 80 device_set_node(&pdev->dev, dev_fwnode(pdev->dev.parent)); 81 82 pdata = dev_get_platdata(pdev->dev.parent); 83 tps6586x_gpio = devm_kzalloc(&pdev->dev, 84 sizeof(*tps6586x_gpio), GFP_KERNEL); 85 if (!tps6586x_gpio) 86 return -ENOMEM; 87 88 tps6586x_gpio->parent = pdev->dev.parent; 89 90 tps6586x_gpio->gpio_chip.owner = THIS_MODULE; 91 tps6586x_gpio->gpio_chip.label = pdev->name; 92 tps6586x_gpio->gpio_chip.parent = &pdev->dev; 93 tps6586x_gpio->gpio_chip.ngpio = 4; 94 tps6586x_gpio->gpio_chip.can_sleep = true; 95 96 /* FIXME: add handling of GPIOs as dedicated inputs */ 97 tps6586x_gpio->gpio_chip.direction_output = tps6586x_gpio_output; 98 tps6586x_gpio->gpio_chip.set = tps6586x_gpio_set; 99 tps6586x_gpio->gpio_chip.get = tps6586x_gpio_get; 100 tps6586x_gpio->gpio_chip.to_irq = tps6586x_gpio_to_irq; 101 102 if (pdata && pdata->gpio_base) 103 tps6586x_gpio->gpio_chip.base = pdata->gpio_base; 104 else 105 tps6586x_gpio->gpio_chip.base = -1; 106 107 return devm_gpiochip_add_data(&pdev->dev, &tps6586x_gpio->gpio_chip, 108 tps6586x_gpio); 109 } 110 111 static struct platform_driver tps6586x_gpio_driver = { 112 .driver.name = "tps6586x-gpio", 113 .probe = tps6586x_gpio_probe, 114 }; 115 116 static int __init tps6586x_gpio_init(void) 117 { 118 return platform_driver_register(&tps6586x_gpio_driver); 119 } 120 subsys_initcall(tps6586x_gpio_init); 121