1 // SPDX-License-Identifier: GPL-2.0+
3  * Access to GPIOs on TWL4030/TPS659x0 chips
5  * Copyright (C) 2006-2007 Texas Instruments, Inc.
8  * Code re-arranged and cleaned up by:
16 #include <linux/init.h>
30  * The GPIO "subchip" supports 18 GPIOs which can be configured as
37  * There are also two LED pins used sometimes as output-only GPIOs.
52 /* Mask for GPIO registers when aggregated into a 32-bit integer */
66 /*----------------------------------------------------------------------*/
76 /*----------------------------------------------------------------------*/
80  * PWMs A and B are dedicated to LEDs A and B, respectively.
101 /*----------------------------------------------------------------------*/
115 /*----------------------------------------------------------------------*/
205 /*----------------------------------------------------------------------*/
212 	mutex_lock(&priv->mutex);  in twl_request()
214 	/* Support the two LED outputs as output-only GPIOs. */  in twl_request()
220 		offset -= TWL4030_GPIO_MAX;  in twl_request()
226 		/* initialize PWM to always-drive */  in twl_request()
237 		/* init LED to not-driven (high) */  in twl_request()
253 	if (!priv->usage_count) {  in twl_request()
257 		/* optionally have the first two GPIOs switch vMMC1  in twl_request()
260 		pdata = dev_get_platdata(chip->parent);  in twl_request()
262 			value |= pdata->mmc_cd & 0x03;  in twl_request()
269 		priv->usage_count |= BIT(offset);  in twl_request()
271 	mutex_unlock(&priv->mutex);  in twl_request()
279 	mutex_lock(&priv->mutex);  in twl_free()
281 		twl4030_led_set_value(offset - TWL4030_GPIO_MAX, 1);  in twl_free()
285 	priv->usage_count &= ~BIT(offset);  in twl_free()
288 	if (!priv->usage_count)  in twl_free()
292 	mutex_unlock(&priv->mutex);  in twl_free()
300 	mutex_lock(&priv->mutex);  in twl_direction_in()
304 		ret = -EINVAL;	/* LED outputs can't be set as input */  in twl_direction_in()
307 		priv->direction &= ~BIT(offset);  in twl_direction_in()
309 	mutex_unlock(&priv->mutex);  in twl_direction_in()
320 	mutex_lock(&priv->mutex);  in twl_get()
321 	if (!(priv->usage_count & BIT(offset))) {  in twl_get()
322 		ret = -EPERM;  in twl_get()
326 	if (priv->direction & BIT(offset))  in twl_get()
327 		status = priv->out_state & BIT(offset);  in twl_get()
333 	mutex_unlock(&priv->mutex);  in twl_get()
341 	mutex_lock(&priv->mutex);  in twl_set()
345 		twl4030_led_set_value(offset - TWL4030_GPIO_MAX, value);  in twl_set()
348 		priv->out_state |= BIT(offset);  in twl_set()
350 		priv->out_state &= ~BIT(offset);  in twl_set()
352 	mutex_unlock(&priv->mutex);  in twl_set()
360 	mutex_lock(&priv->mutex);  in twl_direction_out()
364 			mutex_unlock(&priv->mutex);  in twl_direction_out()
370 	 *  LED gpios i.e. offset >= TWL4030_GPIO_MAX are always output  in twl_direction_out()
373 	priv->direction |= BIT(offset);  in twl_direction_out()
374 	mutex_unlock(&priv->mutex);  in twl_direction_out()
386 	 * LED GPIOs >= TWL4030_GPIO_MAX are always output  in twl_get_direction()
390 	mutex_lock(&priv->mutex);  in twl_get_direction()
394 			mutex_unlock(&priv->mutex);  in twl_get_direction()
398 	mutex_unlock(&priv->mutex);  in twl_get_direction()
407 	return (priv->irq_base && (offset < TWL4030_GPIO_MAX))  in twl_to_irq()
408 		? (priv->irq_base + offset)  in twl_to_irq()
409 		: -EINVAL;  in twl_to_irq()
426 /*----------------------------------------------------------------------*/
478 	omap_twl_info->use_leds = of_property_read_bool(dev->of_node,  in of_gpio_twl4030()
479 			"ti,use-leds");  in of_gpio_twl4030()
481 	of_property_read_u32(dev->of_node, "ti,debounce",  in of_gpio_twl4030()
482 			     &omap_twl_info->debounce);  in of_gpio_twl4030()
483 	of_property_read_u32(dev->of_node, "ti,mmc-cd",  in of_gpio_twl4030()
484 			     (u32 *)&omap_twl_info->mmc_cd);  in of_gpio_twl4030()
485 	of_property_read_u32(dev->of_node, "ti,pullups",  in of_gpio_twl4030()
486 			     &omap_twl_info->pullups);  in of_gpio_twl4030()
487 	of_property_read_u32(dev->of_node, "ti,pulldowns",  in of_gpio_twl4030()
488 			     &omap_twl_info->pulldowns);  in of_gpio_twl4030()
505 	struct device_node *node = pdev->dev.of_node;  in gpio_twl4030_probe()
509 	priv = devm_kzalloc(&pdev->dev, sizeof(struct gpio_twl4030_priv),  in gpio_twl4030_probe()
512 		return -ENOMEM;  in gpio_twl4030_probe()
516 		dev_err(&pdev->dev, "can't dispatch IRQs from modules\n");  in gpio_twl4030_probe()
520 	irq_base = devm_irq_alloc_descs(&pdev->dev, -1,  in gpio_twl4030_probe()
523 		dev_err(&pdev->dev, "Failed to alloc irq_descs\n");  in gpio_twl4030_probe()
530 	ret = twl4030_sih_setup(&pdev->dev, TWL4030_MODULE_GPIO, irq_base);  in gpio_twl4030_probe()
534 	priv->irq_base = irq_base;  in gpio_twl4030_probe()
537 	priv->gpio_chip = template_chip;  in gpio_twl4030_probe()
538 	priv->gpio_chip.base = -1;  in gpio_twl4030_probe()
539 	priv->gpio_chip.ngpio = TWL4030_GPIO_MAX;  in gpio_twl4030_probe()
540 	priv->gpio_chip.parent = &pdev->dev;  in gpio_twl4030_probe()
542 	mutex_init(&priv->mutex);  in gpio_twl4030_probe()
544 	pdata = of_gpio_twl4030(&pdev->dev);  in gpio_twl4030_probe()
546 		dev_err(&pdev->dev, "Platform data is missing\n");  in gpio_twl4030_probe()
547 		return -ENXIO;  in gpio_twl4030_probe()
552 	 * and pulldowns correctly ... default for non-ULPI pins is  in gpio_twl4030_probe()
556 	ret = gpio_twl4030_pulls(pdata->pullups, pdata->pulldowns);  in gpio_twl4030_probe()
558 		dev_dbg(&pdev->dev, "pullups %.05x %.05x --> %d\n",  in gpio_twl4030_probe()
559 			pdata->pullups, pdata->pulldowns, ret);  in gpio_twl4030_probe()
561 	ret = gpio_twl4030_debounce(pdata->debounce, pdata->mmc_cd);  in gpio_twl4030_probe()
563 		dev_dbg(&pdev->dev, "debounce %.03x %.01x --> %d\n",  in gpio_twl4030_probe()
564 			pdata->debounce, pdata->mmc_cd, ret);  in gpio_twl4030_probe()
570 	if (pdata->use_leds)  in gpio_twl4030_probe()
571 		priv->gpio_chip.ngpio += 2;  in gpio_twl4030_probe()
573 	ret = devm_gpiochip_add_data(&pdev->dev, &priv->gpio_chip, priv);  in gpio_twl4030_probe()
575 		dev_err(&pdev->dev, "could not register gpiochip, %d\n", ret);  in gpio_twl4030_probe()
576 		priv->gpio_chip.ngpio = 0;  in gpio_twl4030_probe()
585 	    of_machine_is_compatible("compulab,omap3-sbc-t3730")) {  in gpio_twl4030_probe()
588 		d = gpiochip_request_own_desc(&priv->gpio_chip,  in gpio_twl4030_probe()
593 			return dev_err_probe(&pdev->dev, PTR_ERR(d),  in gpio_twl4030_probe()
598 		ret = devm_add_action_or_reset(&pdev->dev, gpio_twl4030_power_off_action, d);  in gpio_twl4030_probe()
600 			return dev_err_probe(&pdev->dev, ret,  in gpio_twl4030_probe()
609 	{ .compatible = "ti,twl4030-gpio", },
614 /* Note:  this hardware lives inside an I2C-based multi-function device. */