// SPDX-License-Identifier: GPL-2.0+ /* * Access to GPOs on TWL6040 chip * * Copyright (C) 2012 Texas Instruments, Inc. * * Authors: * Sergio Aguirre <saaguirre@ti.com> * Peter Ujfalusi <peter.ujfalusi@ti.com> */ #include <linux/module.h> #include <linux/init.h> #include <linux/kthread.h> #include <linux/irq.h> #include <linux/gpio/driver.h> #include <linux/platform_device.h> #include <linux/bitops.h> #include <linux/of.h> #include <linux/mfd/twl6040.h> static int twl6040gpo_get(struct gpio_chip *chip, unsigned offset) { struct twl6040 *twl6040 = dev_get_drvdata(chip->parent->parent); int ret = 0; ret = twl6040_reg_read(twl6040, TWL6040_REG_GPOCTL); if (ret < 0) return ret; return !!(ret & BIT(offset)); } static int twl6040gpo_get_direction(struct gpio_chip *chip, unsigned offset) { return GPIO_LINE_DIRECTION_OUT; } static int twl6040gpo_direction_out(struct gpio_chip *chip, unsigned offset, int value) { /* This only drives GPOs, and can't change direction */ return 0; } static void twl6040gpo_set(struct gpio_chip *chip, unsigned offset, int value) { struct twl6040 *twl6040 = dev_get_drvdata(chip->parent->parent); int ret; u8 gpoctl; ret = twl6040_reg_read(twl6040, TWL6040_REG_GPOCTL); if (ret < 0) return; if (value) gpoctl = ret | BIT(offset); else gpoctl = ret & ~BIT(offset); twl6040_reg_write(twl6040, TWL6040_REG_GPOCTL, gpoctl); } static struct gpio_chip twl6040gpo_chip = { .label = "twl6040", .owner = THIS_MODULE, .get = twl6040gpo_get, .direction_output = twl6040gpo_direction_out, .get_direction = twl6040gpo_get_direction, .set = twl6040gpo_set, .can_sleep = true, }; /*----------------------------------------------------------------------*/ static int gpo_twl6040_probe(struct platform_device *pdev) { struct device *twl6040_core_dev = pdev->dev.parent; struct twl6040 *twl6040 = dev_get_drvdata(twl6040_core_dev); int ret; device_set_node(&pdev->dev, dev_fwnode(pdev->dev.parent)); twl6040gpo_chip.base = -1; if (twl6040_get_revid(twl6040) < TWL6041_REV_ES2_0) twl6040gpo_chip.ngpio = 3; /* twl6040 have 3 GPO */ else twl6040gpo_chip.ngpio = 1; /* twl6041 have 1 GPO */ twl6040gpo_chip.parent = &pdev->dev; ret = devm_gpiochip_add_data(&pdev->dev, &twl6040gpo_chip, NULL); if (ret < 0) { dev_err(&pdev->dev, "could not register gpiochip, %d\n", ret); twl6040gpo_chip.ngpio = 0; } return ret; } /* Note: this hardware lives inside an I2C-based multi-function device. */ MODULE_ALIAS("platform:twl6040-gpo"); static struct platform_driver gpo_twl6040_driver = { .driver = { .name = "twl6040-gpo", }, .probe = gpo_twl6040_probe, }; module_platform_driver(gpo_twl6040_driver); MODULE_AUTHOR("Texas Instruments, Inc."); MODULE_DESCRIPTION("GPO interface for TWL6040"); MODULE_LICENSE("GPL");