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146 lines
3.7 KiB
146 lines
3.7 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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* gpiolib support for Wolfson WM835x PMICs |
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* |
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* Copyright 2009 Wolfson Microelectronics PLC. |
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* |
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* Author: Mark Brown <[email protected]> |
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* |
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*/ |
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#include <linux/kernel.h> |
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#include <linux/slab.h> |
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#include <linux/module.h> |
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#include <linux/gpio/driver.h> |
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#include <linux/mfd/core.h> |
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#include <linux/platform_device.h> |
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#include <linux/seq_file.h> |
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#include <linux/mfd/wm8350/core.h> |
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#include <linux/mfd/wm8350/gpio.h> |
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struct wm8350_gpio_data { |
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struct wm8350 *wm8350; |
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struct gpio_chip gpio_chip; |
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}; |
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static int wm8350_gpio_direction_in(struct gpio_chip *chip, unsigned offset) |
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{ |
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struct wm8350_gpio_data *wm8350_gpio = gpiochip_get_data(chip); |
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struct wm8350 *wm8350 = wm8350_gpio->wm8350; |
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return wm8350_set_bits(wm8350, WM8350_GPIO_CONFIGURATION_I_O, |
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1 << offset); |
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} |
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static int wm8350_gpio_get(struct gpio_chip *chip, unsigned offset) |
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{ |
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struct wm8350_gpio_data *wm8350_gpio = gpiochip_get_data(chip); |
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struct wm8350 *wm8350 = wm8350_gpio->wm8350; |
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int ret; |
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ret = wm8350_reg_read(wm8350, WM8350_GPIO_LEVEL); |
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if (ret < 0) |
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return ret; |
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if (ret & (1 << offset)) |
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return 1; |
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else |
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return 0; |
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} |
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static void wm8350_gpio_set(struct gpio_chip *chip, unsigned offset, int value) |
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{ |
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struct wm8350_gpio_data *wm8350_gpio = gpiochip_get_data(chip); |
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struct wm8350 *wm8350 = wm8350_gpio->wm8350; |
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if (value) |
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wm8350_set_bits(wm8350, WM8350_GPIO_LEVEL, 1 << offset); |
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else |
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wm8350_clear_bits(wm8350, WM8350_GPIO_LEVEL, 1 << offset); |
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} |
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static int wm8350_gpio_direction_out(struct gpio_chip *chip, |
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unsigned offset, int value) |
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{ |
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struct wm8350_gpio_data *wm8350_gpio = gpiochip_get_data(chip); |
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struct wm8350 *wm8350 = wm8350_gpio->wm8350; |
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int ret; |
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ret = wm8350_clear_bits(wm8350, WM8350_GPIO_CONFIGURATION_I_O, |
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1 << offset); |
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if (ret < 0) |
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return ret; |
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/* Don't have an atomic direction/value setup */ |
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wm8350_gpio_set(chip, offset, value); |
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return 0; |
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} |
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static int wm8350_gpio_to_irq(struct gpio_chip *chip, unsigned offset) |
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{ |
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struct wm8350_gpio_data *wm8350_gpio = gpiochip_get_data(chip); |
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struct wm8350 *wm8350 = wm8350_gpio->wm8350; |
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if (!wm8350->irq_base) |
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return -EINVAL; |
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return wm8350->irq_base + WM8350_IRQ_GPIO(offset); |
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} |
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static const struct gpio_chip template_chip = { |
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.label = "wm8350", |
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.owner = THIS_MODULE, |
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.direction_input = wm8350_gpio_direction_in, |
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.get = wm8350_gpio_get, |
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.direction_output = wm8350_gpio_direction_out, |
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.set = wm8350_gpio_set, |
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.to_irq = wm8350_gpio_to_irq, |
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.can_sleep = true, |
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}; |
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static int wm8350_gpio_probe(struct platform_device *pdev) |
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{ |
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struct wm8350 *wm8350 = dev_get_drvdata(pdev->dev.parent); |
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struct wm8350_platform_data *pdata = dev_get_platdata(wm8350->dev); |
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struct wm8350_gpio_data *wm8350_gpio; |
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wm8350_gpio = devm_kzalloc(&pdev->dev, sizeof(*wm8350_gpio), |
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GFP_KERNEL); |
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if (wm8350_gpio == NULL) |
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return -ENOMEM; |
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wm8350_gpio->wm8350 = wm8350; |
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wm8350_gpio->gpio_chip = template_chip; |
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wm8350_gpio->gpio_chip.ngpio = 13; |
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wm8350_gpio->gpio_chip.parent = &pdev->dev; |
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if (pdata && pdata->gpio_base) |
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wm8350_gpio->gpio_chip.base = pdata->gpio_base; |
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else |
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wm8350_gpio->gpio_chip.base = -1; |
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return devm_gpiochip_add_data(&pdev->dev, &wm8350_gpio->gpio_chip, wm8350_gpio); |
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} |
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static struct platform_driver wm8350_gpio_driver = { |
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.driver.name = "wm8350-gpio", |
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.probe = wm8350_gpio_probe, |
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}; |
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static int __init wm8350_gpio_init(void) |
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{ |
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return platform_driver_register(&wm8350_gpio_driver); |
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} |
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subsys_initcall(wm8350_gpio_init); |
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static void __exit wm8350_gpio_exit(void) |
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{ |
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platform_driver_unregister(&wm8350_gpio_driver); |
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} |
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module_exit(wm8350_gpio_exit); |
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MODULE_AUTHOR("Mark Brown <[email protected]>"); |
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MODULE_DESCRIPTION("GPIO interface for WM8350 PMICs"); |
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MODULE_LICENSE("GPL"); |
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MODULE_ALIAS("platform:wm8350-gpio");
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