// SPDX-License-Identifier: GPL-2.0-or-later

  /*
   * wm8994-irq.c  --  Interrupt controller support for Wolfson WM8994
   *
   * Copyright 2010 Wolfson Microelectronics PLC.
   *
   * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>

   */
  
  #include <linux/kernel.h>
  #include <linux/module.h>

  #include <linux/gpio.h>

  #include <linux/i2c.h>
  #include <linux/irq.h>
  #include <linux/mfd/core.h>
  #include <linux/interrupt.h>

  #include <linux/irqdomain.h>

  #include <linux/regmap.h>

  
  #include <linux/mfd/wm8994/core.h>

  #include <linux/mfd/wm8994/pdata.h>

  #include <linux/mfd/wm8994/registers.h>
  
  #include <linux/delay.h>

  static const struct regmap_irq wm8994_irqs[] = {

  	[WM8994_IRQ_TEMP_SHUT] = {

  		.reg_offset = 1,

  		.mask = WM8994_TEMP_SHUT_EINT,
  	},
  	[WM8994_IRQ_MIC1_DET] = {

  		.reg_offset = 1,

  		.mask = WM8994_MIC1_DET_EINT,
  	},
  	[WM8994_IRQ_MIC1_SHRT] = {

  		.reg_offset = 1,

  		.mask = WM8994_MIC1_SHRT_EINT,
  	},
  	[WM8994_IRQ_MIC2_DET] = {

  		.reg_offset = 1,

  		.mask = WM8994_MIC2_DET_EINT,
  	},
  	[WM8994_IRQ_MIC2_SHRT] = {

  		.reg_offset = 1,

  		.mask = WM8994_MIC2_SHRT_EINT,
  	},
  	[WM8994_IRQ_FLL1_LOCK] = {

  		.reg_offset = 1,

  		.mask = WM8994_FLL1_LOCK_EINT,
  	},
  	[WM8994_IRQ_FLL2_LOCK] = {

  		.reg_offset = 1,

  		.mask = WM8994_FLL2_LOCK_EINT,
  	},
  	[WM8994_IRQ_SRC1_LOCK] = {

  		.reg_offset = 1,

  		.mask = WM8994_SRC1_LOCK_EINT,
  	},
  	[WM8994_IRQ_SRC2_LOCK] = {

  		.reg_offset = 1,

  		.mask = WM8994_SRC2_LOCK_EINT,
  	},
  	[WM8994_IRQ_AIF1DRC1_SIG_DET] = {

  		.reg_offset = 1,

  		.mask = WM8994_AIF1DRC1_SIG_DET,
  	},
  	[WM8994_IRQ_AIF1DRC2_SIG_DET] = {

  		.reg_offset = 1,

  		.mask = WM8994_AIF1DRC2_SIG_DET_EINT,
  	},
  	[WM8994_IRQ_AIF2DRC_SIG_DET] = {

  		.reg_offset = 1,

  		.mask = WM8994_AIF2DRC_SIG_DET_EINT,
  	},
  	[WM8994_IRQ_FIFOS_ERR] = {

  		.reg_offset = 1,

  		.mask = WM8994_FIFOS_ERR_EINT,
  	},
  	[WM8994_IRQ_WSEQ_DONE] = {

  		.reg_offset = 1,

  		.mask = WM8994_WSEQ_DONE_EINT,
  	},
  	[WM8994_IRQ_DCS_DONE] = {

  		.reg_offset = 1,

  		.mask = WM8994_DCS_DONE_EINT,
  	},
  	[WM8994_IRQ_TEMP_WARN] = {

  		.reg_offset = 1,

  		.mask = WM8994_TEMP_WARN_EINT,
  	},
  	[WM8994_IRQ_GPIO(1)] = {

  		.mask = WM8994_GP1_EINT,
  	},
  	[WM8994_IRQ_GPIO(2)] = {

  		.mask = WM8994_GP2_EINT,
  	},
  	[WM8994_IRQ_GPIO(3)] = {

  		.mask = WM8994_GP3_EINT,
  	},
  	[WM8994_IRQ_GPIO(4)] = {

  		.mask = WM8994_GP4_EINT,
  	},
  	[WM8994_IRQ_GPIO(5)] = {

  		.mask = WM8994_GP5_EINT,
  	},
  	[WM8994_IRQ_GPIO(6)] = {

  		.mask = WM8994_GP6_EINT,
  	},
  	[WM8994_IRQ_GPIO(7)] = {

  		.mask = WM8994_GP7_EINT,
  	},
  	[WM8994_IRQ_GPIO(8)] = {

  		.mask = WM8994_GP8_EINT,
  	},
  	[WM8994_IRQ_GPIO(9)] = {

  		.mask = WM8994_GP8_EINT,
  	},
  	[WM8994_IRQ_GPIO(10)] = {

  		.mask = WM8994_GP10_EINT,
  	},
  	[WM8994_IRQ_GPIO(11)] = {

  		.mask = WM8994_GP11_EINT,
  	},
  };

  static const struct regmap_irq_chip wm8994_irq_chip = {

  	.name = "wm8994",
  	.irqs = wm8994_irqs,
  	.num_irqs = ARRAY_SIZE(wm8994_irqs),

  	.num_regs = 2,
  	.status_base = WM8994_INTERRUPT_STATUS_1,
  	.mask_base = WM8994_INTERRUPT_STATUS_1_MASK,
  	.ack_base = WM8994_INTERRUPT_STATUS_1,

  	.runtime_pm = true,

  };

  static void wm8994_edge_irq_enable(struct irq_data *data)
  {
  }
  
  static void wm8994_edge_irq_disable(struct irq_data *data)
  {
  }
  
  static struct irq_chip wm8994_edge_irq_chip = {
  	.name			= "wm8994_edge",
  	.irq_disable		= wm8994_edge_irq_disable,
  	.irq_enable		= wm8994_edge_irq_enable,
  };
  
  static irqreturn_t wm8994_edge_irq(int irq, void *data)
  {
  	struct wm8994 *wm8994 = data;
  
  	while (gpio_get_value_cansleep(wm8994->pdata.irq_gpio))
  		handle_nested_irq(irq_create_mapping(wm8994->edge_irq, 0));
  
  	return IRQ_HANDLED;
  }
  
  static int wm8994_edge_irq_map(struct irq_domain *h, unsigned int virq,
  			       irq_hw_number_t hw)
  {
  	struct wm8994 *wm8994 = h->host_data;
  
  	irq_set_chip_data(virq, wm8994);
  	irq_set_chip_and_handler(virq, &wm8994_edge_irq_chip, handle_edge_irq);
  	irq_set_nested_thread(virq, 1);

  	irq_set_noprobe(virq);

  
  	return 0;
  }

  static const struct irq_domain_ops wm8994_edge_irq_ops = {

  	.map	= wm8994_edge_irq_map,
  	.xlate	= irq_domain_xlate_twocell,
  };

  int wm8994_irq_init(struct wm8994 *wm8994)
  {

  	int ret;

  	unsigned long irqflags;

  	struct wm8994_pdata *pdata = &wm8994->pdata;

  
  	if (!wm8994->irq) {
  		dev_warn(wm8994->dev,
  			 "No interrupt specified, no interrupts
  ");
  		wm8994->irq_base = 0;
  		return 0;
  	}

  	/* select user or default irq flags */
  	irqflags = IRQF_TRIGGER_HIGH | IRQF_ONESHOT;
  	if (pdata->irq_flags)
  		irqflags = pdata->irq_flags;

  	/* use a GPIO for edge triggered controllers */
  	if (irqflags & (IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING)) {
  		if (gpio_to_irq(pdata->irq_gpio) != wm8994->irq) {
  			dev_warn(wm8994->dev, "IRQ %d is not GPIO %d (%d)
  ",
  				 wm8994->irq, pdata->irq_gpio,
  				 gpio_to_irq(pdata->irq_gpio));
  			wm8994->irq = gpio_to_irq(pdata->irq_gpio);
  		}
  
  		ret = devm_gpio_request_one(wm8994->dev, pdata->irq_gpio,
  					    GPIOF_IN, "WM8994 IRQ");
  
  		if (ret != 0) {
  			dev_err(wm8994->dev, "Failed to get IRQ GPIO: %d
  ",
  				ret);
  			return ret;
  		}
  
  		wm8994->edge_irq = irq_domain_add_linear(NULL, 1,
  							 &wm8994_edge_irq_ops,
  							 wm8994);
  
  		ret = regmap_add_irq_chip(wm8994->regmap,
  					  irq_create_mapping(wm8994->edge_irq,
  							     0),
  					  IRQF_ONESHOT,
  					  wm8994->irq_base, &wm8994_irq_chip,
  					  &wm8994->irq_data);
  		if (ret != 0) {
  			dev_err(wm8994->dev, "Failed to get IRQ: %d
  ",
  				ret);
  			return ret;
  		}
  
  		ret = request_threaded_irq(wm8994->irq,
  					   NULL, wm8994_edge_irq,
  					   irqflags,
  					   "WM8994 edge", wm8994);
  	} else {
  		ret = regmap_add_irq_chip(wm8994->regmap, wm8994->irq,
  					  irqflags,
  					  wm8994->irq_base, &wm8994_irq_chip,
  					  &wm8994->irq_data);
  	}

  	if (ret != 0) {

  		dev_err(wm8994->dev, "Failed to register IRQ chip: %d
  ", ret);

  		return ret;
  	}
  
  	/* Enable top level interrupt if it was masked */
  	wm8994_reg_write(wm8994, WM8994_INTERRUPT_CONTROL, 0);
  
  	return 0;
  }

  EXPORT_SYMBOL(wm8994_irq_init);

  
  void wm8994_irq_exit(struct wm8994 *wm8994)
  {

  	regmap_del_irq_chip(wm8994->irq, wm8994->irq_data);

  }

  EXPORT_SYMBOL(wm8994_irq_exit);