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:
28  * The GPIO "subchip" supports 18 GPIOs which can be configured as
35  * There are also two LED pins used sometimes as output-only GPIOs.
50 /* Mask for GPIO registers when aggregated into a 32-bit integer */
64 /*----------------------------------------------------------------------*/
69 static inline int gpio_twl4030_write(u8 address, u8 data)  in gpio_twl4030_write()  argument
71 	return twl_i2c_write_u8(TWL4030_MODULE_GPIO, data, address);  in gpio_twl4030_write()
74 /*----------------------------------------------------------------------*/
99 /*----------------------------------------------------------------------*/
106 	u8 data;  in gpio_twl4030_read()  local
109 	ret = twl_i2c_read_u8(TWL4030_MODULE_GPIO, &data, address);  in gpio_twl4030_read()
110 	return (ret < 0) ? ret : data;  in gpio_twl4030_read()
113 /*----------------------------------------------------------------------*/
203 /*----------------------------------------------------------------------*/
210 	mutex_lock(&priv->mutex);  in twl_request()
212 	/* Support the two LED outputs as output-only GPIOs. */  in twl_request()
218 		offset -= TWL4030_GPIO_MAX;  in twl_request()
224 		/* initialize PWM to always-drive */  in twl_request()
225 		/* Configure PWM OFF register first */  in twl_request()
235 		/* init LED to not-driven (high) */  in twl_request()
250 	/* on first use, turn GPIO module "on" */  in twl_request()
251 	if (!priv->usage_count) {  in twl_request()
255 		/* optionally have the first two GPIOs switch vMMC1  in twl_request()
258 		pdata = dev_get_platdata(chip->parent);  in twl_request()
260 			value |= pdata->mmc_cd & 0x03;  in twl_request()
267 		priv->usage_count |= BIT(offset);  in twl_request()
269 	mutex_unlock(&priv->mutex);  in twl_request()
277 	mutex_lock(&priv->mutex);  in twl_free()
279 		twl4030_led_set_value(offset - TWL4030_GPIO_MAX, 1);  in twl_free()
283 	priv->usage_count &= ~BIT(offset);  in twl_free()
286 	if (!priv->usage_count)  in twl_free()
290 	mutex_unlock(&priv->mutex);  in twl_free()
298 	mutex_lock(&priv->mutex);  in twl_direction_in()
302 		ret = -EINVAL;	/* LED outputs can't be set as input */  in twl_direction_in()
305 		priv->direction &= ~BIT(offset);  in twl_direction_in()
307 	mutex_unlock(&priv->mutex);  in twl_direction_in()
318 	mutex_lock(&priv->mutex);  in twl_get()
319 	if (!(priv->usage_count & BIT(offset))) {  in twl_get()
320 		ret = -EPERM;  in twl_get()
324 	if (priv->direction & BIT(offset))  in twl_get()
325 		status = priv->out_state & BIT(offset);  in twl_get()
331 	mutex_unlock(&priv->mutex);  in twl_get()
339 	mutex_lock(&priv->mutex);  in twl_set()
343 		twl4030_led_set_value(offset - TWL4030_GPIO_MAX, value);  in twl_set()
346 		priv->out_state |= BIT(offset);  in twl_set()
348 		priv->out_state &= ~BIT(offset);  in twl_set()
350 	mutex_unlock(&priv->mutex);  in twl_set()
358 	mutex_lock(&priv->mutex);  in twl_direction_out()
362 			mutex_unlock(&priv->mutex);  in twl_direction_out()
368 	 *  LED gpios i.e. offset >= TWL4030_GPIO_MAX are always output  in twl_direction_out()
371 	priv->direction |= BIT(offset);  in twl_direction_out()
372 	mutex_unlock(&priv->mutex);  in twl_direction_out()
384 	 * LED GPIOs >= TWL4030_GPIO_MAX are always output  in twl_get_direction()
388 	mutex_lock(&priv->mutex);  in twl_get_direction()
392 			mutex_unlock(&priv->mutex);  in twl_get_direction()
396 	mutex_unlock(&priv->mutex);  in twl_get_direction()
405 	return (priv->irq_base && (offset < TWL4030_GPIO_MAX))  in twl_to_irq()
406 		? (priv->irq_base + offset)  in twl_to_irq()
407 		: -EINVAL;  in twl_to_irq()
424 /*----------------------------------------------------------------------*/
432 	 * We should have data that's specific to this board.  in gpio_twl4030_pulls()
482 	omap_twl_info->use_leds = of_property_read_bool(dev->of_node,  in of_gpio_twl4030()
483 			"ti,use-leds");  in of_gpio_twl4030()
485 	of_property_read_u32(dev->of_node, "ti,debounce",  in of_gpio_twl4030()
486 			     &omap_twl_info->debounce);  in of_gpio_twl4030()
487 	of_property_read_u32(dev->of_node, "ti,mmc-cd",  in of_gpio_twl4030()
488 			     (u32 *)&omap_twl_info->mmc_cd);  in of_gpio_twl4030()
489 	of_property_read_u32(dev->of_node, "ti,pullups",  in of_gpio_twl4030()
490 			     &omap_twl_info->pullups);  in of_gpio_twl4030()
491 	of_property_read_u32(dev->of_node, "ti,pulldowns",  in of_gpio_twl4030()
492 			     &omap_twl_info->pulldowns);  in of_gpio_twl4030()
499 	struct twl4030_gpio_platform_data *pdata = dev_get_platdata(&pdev->dev);  in gpio_twl4030_probe()
500 	struct device_node *node = pdev->dev.of_node;  in gpio_twl4030_probe()
504 	priv = devm_kzalloc(&pdev->dev, sizeof(struct gpio_twl4030_priv),  in gpio_twl4030_probe()
507 		return -ENOMEM;  in gpio_twl4030_probe()
511 		dev_err(&pdev->dev, "can't dispatch IRQs from modules\n");  in gpio_twl4030_probe()
515 	irq_base = devm_irq_alloc_descs(&pdev->dev, -1,  in gpio_twl4030_probe()
518 		dev_err(&pdev->dev, "Failed to alloc irq_descs\n");  in gpio_twl4030_probe()
525 	ret = twl4030_sih_setup(&pdev->dev, TWL4030_MODULE_GPIO, irq_base);  in gpio_twl4030_probe()
529 	priv->irq_base = irq_base;  in gpio_twl4030_probe()
532 	priv->gpio_chip = template_chip;  in gpio_twl4030_probe()
533 	priv->gpio_chip.base = -1;  in gpio_twl4030_probe()
534 	priv->gpio_chip.ngpio = TWL4030_GPIO_MAX;  in gpio_twl4030_probe()
535 	priv->gpio_chip.parent = &pdev->dev;  in gpio_twl4030_probe()
537 	mutex_init(&priv->mutex);  in gpio_twl4030_probe()
540 		pdata = of_gpio_twl4030(&pdev->dev, pdata);  in gpio_twl4030_probe()
543 		dev_err(&pdev->dev, "Platform data is missing\n");  in gpio_twl4030_probe()
544 		return -ENXIO;  in gpio_twl4030_probe()
549 	 * and pulldowns correctly ... default for non-ULPI pins is  in gpio_twl4030_probe()
553 	ret = gpio_twl4030_pulls(pdata->pullups, pdata->pulldowns);  in gpio_twl4030_probe()
555 		dev_dbg(&pdev->dev, "pullups %.05x %.05x --> %d\n",  in gpio_twl4030_probe()
556 			pdata->pullups, pdata->pulldowns, ret);  in gpio_twl4030_probe()
558 	ret = gpio_twl4030_debounce(pdata->debounce, pdata->mmc_cd);  in gpio_twl4030_probe()
560 		dev_dbg(&pdev->dev, "debounce %.03x %.01x --> %d\n",  in gpio_twl4030_probe()
561 			pdata->debounce, pdata->mmc_cd, ret);  in gpio_twl4030_probe()
567 	if (pdata->use_leds)  in gpio_twl4030_probe()
568 		priv->gpio_chip.ngpio += 2;  in gpio_twl4030_probe()
570 	ret = gpiochip_add_data(&priv->gpio_chip, priv);  in gpio_twl4030_probe()
572 		dev_err(&pdev->dev, "could not register gpiochip, %d\n", ret);  in gpio_twl4030_probe()
573 		priv->gpio_chip.ngpio = 0;  in gpio_twl4030_probe()
580 	if (pdata->setup) {  in gpio_twl4030_probe()
583 		status = pdata->setup(&pdev->dev, priv->gpio_chip.base,  in gpio_twl4030_probe()
586 			dev_dbg(&pdev->dev, "setup --> %d\n", status);  in gpio_twl4030_probe()
596 	struct twl4030_gpio_platform_data *pdata = dev_get_platdata(&pdev->dev);  in gpio_twl4030_remove()
600 	if (pdata && pdata->teardown) {  in gpio_twl4030_remove()
601 		status = pdata->teardown(&pdev->dev, priv->gpio_chip.base,  in gpio_twl4030_remove()
604 			dev_dbg(&pdev->dev, "teardown --> %d\n", status);  in gpio_twl4030_remove()
609 	gpiochip_remove(&priv->gpio_chip);  in gpio_twl4030_remove()
616 	return -EIO;  in gpio_twl4030_remove()
620 	{ .compatible = "ti,twl4030-gpio", },
625 /* Note:  this hardware lives inside an I2C-based multi-function device. */