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6dbe6c07f9
When creating MFD platform devices the firmware node is left unset. This, in particular, prevents GPIO library to use it for different purposes. Propagate firmware node from the parent device and let GPIO library do the right thing. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
117 lines
2.8 KiB
C
117 lines
2.8 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Access to GPOs on TWL6040 chip
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*
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* Copyright (C) 2012 Texas Instruments, Inc.
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*
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* Authors:
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* Sergio Aguirre <saaguirre@ti.com>
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* Peter Ujfalusi <peter.ujfalusi@ti.com>
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/kthread.h>
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#include <linux/irq.h>
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#include <linux/gpio/driver.h>
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#include <linux/platform_device.h>
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#include <linux/bitops.h>
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#include <linux/of.h>
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#include <linux/mfd/twl6040.h>
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static int twl6040gpo_get(struct gpio_chip *chip, unsigned offset)
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{
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struct twl6040 *twl6040 = dev_get_drvdata(chip->parent->parent);
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int ret = 0;
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ret = twl6040_reg_read(twl6040, TWL6040_REG_GPOCTL);
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if (ret < 0)
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return ret;
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return !!(ret & BIT(offset));
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}
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static int twl6040gpo_get_direction(struct gpio_chip *chip, unsigned offset)
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{
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return GPIO_LINE_DIRECTION_OUT;
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}
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static int twl6040gpo_direction_out(struct gpio_chip *chip, unsigned offset,
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int value)
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{
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/* This only drives GPOs, and can't change direction */
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return 0;
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}
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static void twl6040gpo_set(struct gpio_chip *chip, unsigned offset, int value)
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{
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struct twl6040 *twl6040 = dev_get_drvdata(chip->parent->parent);
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int ret;
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u8 gpoctl;
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ret = twl6040_reg_read(twl6040, TWL6040_REG_GPOCTL);
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if (ret < 0)
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return;
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if (value)
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gpoctl = ret | BIT(offset);
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else
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gpoctl = ret & ~BIT(offset);
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twl6040_reg_write(twl6040, TWL6040_REG_GPOCTL, gpoctl);
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}
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static struct gpio_chip twl6040gpo_chip = {
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.label = "twl6040",
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.owner = THIS_MODULE,
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.get = twl6040gpo_get,
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.direction_output = twl6040gpo_direction_out,
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.get_direction = twl6040gpo_get_direction,
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.set = twl6040gpo_set,
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.can_sleep = true,
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};
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/*----------------------------------------------------------------------*/
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static int gpo_twl6040_probe(struct platform_device *pdev)
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{
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struct device *twl6040_core_dev = pdev->dev.parent;
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struct twl6040 *twl6040 = dev_get_drvdata(twl6040_core_dev);
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int ret;
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device_set_node(&pdev->dev, dev_fwnode(pdev->dev.parent));
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twl6040gpo_chip.base = -1;
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if (twl6040_get_revid(twl6040) < TWL6041_REV_ES2_0)
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twl6040gpo_chip.ngpio = 3; /* twl6040 have 3 GPO */
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else
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twl6040gpo_chip.ngpio = 1; /* twl6041 have 1 GPO */
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twl6040gpo_chip.parent = &pdev->dev;
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ret = devm_gpiochip_add_data(&pdev->dev, &twl6040gpo_chip, NULL);
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if (ret < 0) {
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dev_err(&pdev->dev, "could not register gpiochip, %d\n", ret);
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twl6040gpo_chip.ngpio = 0;
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}
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return ret;
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}
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/* Note: this hardware lives inside an I2C-based multi-function device. */
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MODULE_ALIAS("platform:twl6040-gpo");
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static struct platform_driver gpo_twl6040_driver = {
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.driver = {
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.name = "twl6040-gpo",
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},
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.probe = gpo_twl6040_probe,
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};
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module_platform_driver(gpo_twl6040_driver);
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MODULE_AUTHOR("Texas Instruments, Inc.");
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MODULE_DESCRIPTION("GPO interface for TWL6040");
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MODULE_LICENSE("GPL");
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