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:
20 #include <linux/gpio/machine.h>
21 #include <linux/gpio/driver.h>
22 #include <linux/gpio/consumer.h>
30  * The GPIO "subchip" supports 18 GPIOs which can be configured as
32  * GPIO can trigger interrupts on either or both edges.
34  * GPIO interrupts can be fed to either of two IRQ lines; this is
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 /*----------------------------------------------------------------------*/
69  * To configure TWL4030 GPIO module registers
76 /*----------------------------------------------------------------------*/
101 /*----------------------------------------------------------------------*/
104  * To read a TWL4030 GPIO module register
115 /*----------------------------------------------------------------------*/
139 static int twl4030_set_gpio_direction(int gpio, int is_input)  in twl4030_set_gpio_direction()  argument
141 	u8 d_bnk = gpio >> 3;  in twl4030_set_gpio_direction()
142 	u8 d_msk = BIT(gpio & 0x7);  in twl4030_set_gpio_direction()
159 static int twl4030_get_gpio_direction(int gpio)  in twl4030_get_gpio_direction()  argument
161 	u8 d_bnk = gpio >> 3;  in twl4030_get_gpio_direction()
162 	u8 d_msk = BIT(gpio & 0x7);  in twl4030_get_gpio_direction()
176 static int twl4030_set_gpio_dataout(int gpio, int enable)  in twl4030_set_gpio_dataout()  argument
178 	u8 d_bnk = gpio >> 3;  in twl4030_set_gpio_dataout()
179 	u8 d_msk = BIT(gpio & 0x7);  in twl4030_set_gpio_dataout()
190 static int twl4030_get_gpio_datain(int gpio)  in twl4030_get_gpio_datain()  argument
192 	u8 d_bnk = gpio >> 3;  in twl4030_get_gpio_datain()
193 	u8 d_off = gpio & 0x7;  in twl4030_get_gpio_datain()
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()
252 	/* on first use, turn GPIO module "on" */  in twl_request()
253 	if (!priv->usage_count) {  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 		WARN_ON_ONCE(twl4030_led_set_value(offset - TWL4030_GPIO_MAX, 1));  in twl_free()
285 	priv->usage_count &= ~BIT(offset);  in twl_free()
287 	/* on last use, switch off GPIO module */  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()
342 	mutex_lock(&priv->mutex);  in twl_set()
346 		ret = twl4030_led_set_value(offset - TWL4030_GPIO_MAX, value);  in twl_set()
349 		priv->out_state |= BIT(offset);  in twl_set()
351 		priv->out_state &= ~BIT(offset);  in twl_set()
353 	mutex_unlock(&priv->mutex);  in twl_set()
363 	mutex_lock(&priv->mutex);  in twl_direction_out()
367 			mutex_unlock(&priv->mutex);  in twl_direction_out()
376 	priv->direction |= BIT(offset);  in twl_direction_out()
377 	mutex_unlock(&priv->mutex);  in twl_direction_out()
391 	mutex_lock(&priv->mutex);  in twl_get_direction()
395 			mutex_unlock(&priv->mutex);  in twl_get_direction()
399 	mutex_unlock(&priv->mutex);  in twl_get_direction()
408 	return (priv->irq_base && (offset < TWL4030_GPIO_MAX))  in twl_to_irq()
409 		? (priv->irq_base + offset)  in twl_to_irq()
410 		: -EINVAL;  in twl_to_irq()
414 	.label			= "twl4030",
427 /*----------------------------------------------------------------------*/
479 	omap_twl_info->use_leds = of_property_read_bool(dev->of_node,  in of_gpio_twl4030()
480 			"ti,use-leds");  in of_gpio_twl4030()
482 	of_property_read_u32(dev->of_node, "ti,debounce",  in of_gpio_twl4030()
483 			     &omap_twl_info->debounce);  in of_gpio_twl4030()
484 	of_property_read_u32(dev->of_node, "ti,mmc-cd",  in of_gpio_twl4030()
485 			     (u32 *)&omap_twl_info->mmc_cd);  in of_gpio_twl4030()
486 	of_property_read_u32(dev->of_node, "ti,pullups",  in of_gpio_twl4030()
487 			     &omap_twl_info->pullups);  in of_gpio_twl4030()
488 	of_property_read_u32(dev->of_node, "ti,pulldowns",  in of_gpio_twl4030()
489 			     &omap_twl_info->pulldowns);  in of_gpio_twl4030()
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()
527 	irq_domain_create_legacy(dev_fwnode(&pdev->dev), TWL4030_GPIO_MAX, irq_base, 0,  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()
582 	 * GPIO.  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()
594 					     "unable to hog wlan pwr GPIO\n");  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. */
638 MODULE_DESCRIPTION("GPIO interface for TWL4030");