Commit 707857d9 authored by Arnd Bergmann's avatar Arnd Bergmann Committed by Lee Jones
Browse files

mfd: Remove htc-i2cpld driver 



The HTC Herald machine was removed, so this driver is no
longer used anywhere.

Cc: Cory Maccarrone <darkstar6262@gmail.com>
Signed-off-by: default avatarArnd Bergmann <arnd@arndb.de>
Signed-off-by: default avatarLee Jones <lee@kernel.org>
Link: https://lore.kernel.org/r/20221019150410.3851944-17-arnd@kernel.org
parent 67470bb7

drivers/mfd/Kconfig

+0 −9
Original line number Diff line number Diff line
@@ -559,15 +559,6 @@ config HTC_PASIC3 
	  HTC Magician devices, respectively. Actual functionality is

	  handled by the leds-pasic3 and ds1wm drivers.



config HTC_I2CPLD

	bool "HTC I2C PLD chip support"

	depends on I2C=y && GPIOLIB

	help

	  If you say yes here you get support for the supposed CPLD

	  found on omap850 HTC devices like the HTC Wizard and HTC Herald.

	  This device provides input and output GPIOs through an I2C

	  interface to one or more sub-chips.



config MFD_INTEL_QUARK_I2C_GPIO

	tristate "Intel Quark MFD I2C GPIO"

	depends on PCI

drivers/mfd/Makefile

+0 −1
Original line number Diff line number Diff line
@@ -19,7 +19,6 @@ obj-$(CONFIG_MFD_EXYNOS_LPASS) += exynos-lpass.o 
obj-$(CONFIG_MFD_GATEWORKS_GSC)	+= gateworks-gsc.o



obj-$(CONFIG_HTC_PASIC3)	+= htc-pasic3.o

obj-$(CONFIG_HTC_I2CPLD)	+= htc-i2cpld.o



obj-$(CONFIG_MFD_TI_LP873X)	+= lp873x.o

obj-$(CONFIG_MFD_TI_LP87565)	+= lp87565.o

drivers/mfd/htc-i2cpld.c

deleted100644 → 0
+0 −627
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0-or-later

/*

 *  htc-i2cpld.c

 *  Chip driver for an unknown CPLD chip found on omap850 HTC devices like

 *  the HTC Wizard and HTC Herald.

 *  The cpld is located on the i2c bus and acts as an input/output GPIO

 *  extender.

 *

 *  Copyright (C) 2009 Cory Maccarrone <darkstar6262@gmail.com>

 *

 *  Based on work done in the linwizard project

 *  Copyright (C) 2008-2009 Angelo Arrifano <miknix@gmail.com>

 */



#include <linux/kernel.h>

#include <linux/init.h>

#include <linux/interrupt.h>

#include <linux/platform_device.h>

#include <linux/i2c.h>

#include <linux/irq.h>

#include <linux/spinlock.h>

#include <linux/htcpld.h>

#include <linux/gpio/driver.h>

#include <linux/gpio/machine.h>

#include <linux/gpio/consumer.h>

#include <linux/slab.h>



struct htcpld_chip {

	spinlock_t              lock;



	/* chip info */

	u8                      reset;

	u8                      addr;

	struct device           *dev;

	struct i2c_client	*client;



	/* Output details */

	u8                      cache_out;

	struct gpio_chip        chip_out;



	/* Input details */

	u8                      cache_in;

	struct gpio_chip        chip_in;



	u16                     irqs_enabled;

	uint                    irq_start;

	int                     nirqs;



	unsigned int		flow_type;

	/*

	 * Work structure to allow for setting values outside of any

	 * possible interrupt context

	 */

	struct work_struct set_val_work;

};



struct htcpld_data {

	/* irq info */

	u16                irqs_enabled;

	uint               irq_start;

	int                nirqs;

	uint               chained_irq;

	struct gpio_desc   *int_reset_gpio_hi;

	struct gpio_desc   *int_reset_gpio_lo;



	/* htcpld info */

	struct htcpld_chip *chip;

	unsigned int       nchips;

};



/* There does not appear to be a way to proactively mask interrupts

 * on the htcpld chip itself.  So, we simply ignore interrupts that

 * aren't desired. */

static void htcpld_mask(struct irq_data *data)

{

	struct htcpld_chip *chip = irq_data_get_irq_chip_data(data);

	chip->irqs_enabled &= ~(1 << (data->irq - chip->irq_start));

	pr_debug("HTCPLD mask %d %04x\n", data->irq, chip->irqs_enabled);

}

static void htcpld_unmask(struct irq_data *data)

{

	struct htcpld_chip *chip = irq_data_get_irq_chip_data(data);

	chip->irqs_enabled |= 1 << (data->irq - chip->irq_start);

	pr_debug("HTCPLD unmask %d %04x\n", data->irq, chip->irqs_enabled);

}



static int htcpld_set_type(struct irq_data *data, unsigned int flags)

{

	struct htcpld_chip *chip = irq_data_get_irq_chip_data(data);



	if (flags & ~IRQ_TYPE_SENSE_MASK)

		return -EINVAL;



	/* We only allow edge triggering */

	if (flags & (IRQ_TYPE_LEVEL_LOW|IRQ_TYPE_LEVEL_HIGH))

		return -EINVAL;



	chip->flow_type = flags;

	return 0;

}



static struct irq_chip htcpld_muxed_chip = {

	.name         = "htcpld",

	.irq_mask     = htcpld_mask,

	.irq_unmask   = htcpld_unmask,

	.irq_set_type = htcpld_set_type,

};



/* To properly dispatch IRQ events, we need to read from the

 * chip.  This is an I2C action that could possibly sleep

 * (which is bad in interrupt context) -- so we use a threaded

 * interrupt handler to get around that.

 */

static irqreturn_t htcpld_handler(int irq, void *dev)

{

	struct htcpld_data *htcpld = dev;

	unsigned int i;

	unsigned long flags;

	int irqpin;



	if (!htcpld) {

		pr_debug("htcpld is null in ISR\n");

		return IRQ_HANDLED;

	}



	/*

	 * For each chip, do a read of the chip and trigger any interrupts

	 * desired.  The interrupts will be triggered from LSB to MSB (i.e.

	 * bit 0 first, then bit 1, etc.)

	 *

	 * For chips that have no interrupt range specified, just skip 'em.

	 */

	for (i = 0; i < htcpld->nchips; i++) {

		struct htcpld_chip *chip = &htcpld->chip[i];

		struct i2c_client *client;

		int val;

		unsigned long uval, old_val;



		if (!chip) {

			pr_debug("chip %d is null in ISR\n", i);

			continue;

		}



		if (chip->nirqs == 0)

			continue;



		client = chip->client;

		if (!client) {

			pr_debug("client %d is null in ISR\n", i);

			continue;

		}



		/* Scan the chip */

		val = i2c_smbus_read_byte_data(client, chip->cache_out);

		if (val < 0) {

			/* Throw a warning and skip this chip */

			dev_warn(chip->dev, "Unable to read from chip: %d\n",

				 val);

			continue;

		}



		uval = (unsigned long)val;



		spin_lock_irqsave(&chip->lock, flags);



		/* Save away the old value so we can compare it */

		old_val = chip->cache_in;



		/* Write the new value */

		chip->cache_in = uval;



		spin_unlock_irqrestore(&chip->lock, flags);



		/*

		 * For each bit in the data (starting at bit 0), trigger

		 * associated interrupts.

		 */

		for (irqpin = 0; irqpin < chip->nirqs; irqpin++) {

			unsigned oldb, newb, type = chip->flow_type;



			irq = chip->irq_start + irqpin;



			/* Run the IRQ handler, but only if the bit value

			 * changed, and the proper flags are set */

			oldb = (old_val >> irqpin) & 1;

			newb = (uval >> irqpin) & 1;



			if ((!oldb && newb && (type & IRQ_TYPE_EDGE_RISING)) ||

			    (oldb && !newb && (type & IRQ_TYPE_EDGE_FALLING))) {

				pr_debug("fire IRQ %d\n", irqpin);

				generic_handle_irq(irq);

			}

		}

	}



	/*

	 * In order to continue receiving interrupts, the int_reset_gpio must

	 * be asserted.

	 */

	if (htcpld->int_reset_gpio_hi)

		gpiod_set_value(htcpld->int_reset_gpio_hi, 1);

	if (htcpld->int_reset_gpio_lo)

		gpiod_set_value(htcpld->int_reset_gpio_lo, 0);



	return IRQ_HANDLED;

}



/*

 * The GPIO set routines can be called from interrupt context, especially if,

 * for example they're attached to the led-gpio framework and a trigger is

 * enabled.  As such, we declared work above in the htcpld_chip structure,

 * and that work is scheduled in the set routine.  The kernel can then run

 * the I2C functions, which will sleep, in process context.

 */

static void htcpld_chip_set(struct gpio_chip *chip, unsigned offset, int val)

{

	struct i2c_client *client;

	struct htcpld_chip *chip_data = gpiochip_get_data(chip);

	unsigned long flags;



	client = chip_data->client;

	if (!client)

		return;



	spin_lock_irqsave(&chip_data->lock, flags);

	if (val)

		chip_data->cache_out |= (1 << offset);

	else

		chip_data->cache_out &= ~(1 << offset);

	spin_unlock_irqrestore(&chip_data->lock, flags);



	schedule_work(&(chip_data->set_val_work));

}



static void htcpld_chip_set_ni(struct work_struct *work)

{

	struct htcpld_chip *chip_data;

	struct i2c_client *client;



	chip_data = container_of(work, struct htcpld_chip, set_val_work);

	client = chip_data->client;

	i2c_smbus_read_byte_data(client, chip_data->cache_out);

}



static int htcpld_chip_get(struct gpio_chip *chip, unsigned offset)

{

	struct htcpld_chip *chip_data = gpiochip_get_data(chip);

	u8 cache;



	if (!strncmp(chip->label, "htcpld-out", 10)) {

		cache = chip_data->cache_out;

	} else if (!strncmp(chip->label, "htcpld-in", 9)) {

		cache = chip_data->cache_in;

	} else

		return -EINVAL;



	return (cache >> offset) & 1;

}



static int htcpld_direction_output(struct gpio_chip *chip,

					unsigned offset, int value)

{

	htcpld_chip_set(chip, offset, value);

	return 0;

}



static int htcpld_direction_input(struct gpio_chip *chip,

					unsigned offset)

{

	/*

	 * No-op: this function can only be called on the input chip.

	 * We do however make sure the offset is within range.

	 */

	return (offset < chip->ngpio) ? 0 : -EINVAL;

}



static int htcpld_chip_to_irq(struct gpio_chip *chip, unsigned offset)

{

	struct htcpld_chip *chip_data = gpiochip_get_data(chip);



	if (offset < chip_data->nirqs)

		return chip_data->irq_start + offset;

	else

		return -EINVAL;

}



static void htcpld_chip_reset(struct i2c_client *client)

{

	struct htcpld_chip *chip_data = i2c_get_clientdata(client);

	if (!chip_data)

		return;



	i2c_smbus_read_byte_data(

		client, (chip_data->cache_out = chip_data->reset));

}



static int htcpld_setup_chip_irq(

		struct platform_device *pdev,

		int chip_index)

{

	struct htcpld_data *htcpld;

	struct htcpld_chip *chip;

	unsigned int irq, irq_end;



	/* Get the platform and driver data */

	htcpld = platform_get_drvdata(pdev);

	chip = &htcpld->chip[chip_index];



	/* Setup irq handlers */

	irq_end = chip->irq_start + chip->nirqs;

	for (irq = chip->irq_start; irq < irq_end; irq++) {

		irq_set_chip_and_handler(irq, &htcpld_muxed_chip,

					 handle_simple_irq);

		irq_set_chip_data(irq, chip);

		irq_clear_status_flags(irq, IRQ_NOREQUEST | IRQ_NOPROBE);

	}



	return 0;

}



static int htcpld_register_chip_i2c(

		struct platform_device *pdev,

		int chip_index)

{

	struct htcpld_data *htcpld;

	struct device *dev = &pdev->dev;

	struct htcpld_core_platform_data *pdata;

	struct htcpld_chip *chip;

	struct htcpld_chip_platform_data *plat_chip_data;

	struct i2c_adapter *adapter;

	struct i2c_client *client;

	struct i2c_board_info info;



	/* Get the platform and driver data */

	pdata = dev_get_platdata(dev);

	htcpld = platform_get_drvdata(pdev);

	chip = &htcpld->chip[chip_index];

	plat_chip_data = &pdata->chip[chip_index];



	adapter = i2c_get_adapter(pdata->i2c_adapter_id);

	if (!adapter) {

		/* Eek, no such I2C adapter!  Bail out. */

		dev_warn(dev, "Chip at i2c address 0x%x: Invalid i2c adapter %d\n",

			 plat_chip_data->addr, pdata->i2c_adapter_id);

		return -ENODEV;

	}



	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_READ_BYTE_DATA)) {

		dev_warn(dev, "i2c adapter %d non-functional\n",

			 pdata->i2c_adapter_id);

		i2c_put_adapter(adapter);

		return -EINVAL;

	}



	memset(&info, 0, sizeof(struct i2c_board_info));

	info.addr = plat_chip_data->addr;

	strscpy(info.type, "htcpld-chip", I2C_NAME_SIZE);

	info.platform_data = chip;



	/* Add the I2C device.  This calls the probe() function. */

	client = i2c_new_client_device(adapter, &info);

	if (IS_ERR(client)) {

		/* I2C device registration failed, contineu with the next */

		dev_warn(dev, "Unable to add I2C device for 0x%x\n",

			 plat_chip_data->addr);

		i2c_put_adapter(adapter);

		return PTR_ERR(client);

	}



	i2c_set_clientdata(client, chip);

	snprintf(client->name, I2C_NAME_SIZE, "Chip_0x%x", client->addr);

	chip->client = client;



	/* Reset the chip */

	htcpld_chip_reset(client);

	chip->cache_in = i2c_smbus_read_byte_data(client, chip->cache_out);



	return 0;

}



static void htcpld_unregister_chip_i2c(

		struct platform_device *pdev,

		int chip_index)

{

	struct htcpld_data *htcpld;

	struct htcpld_chip *chip;



	/* Get the platform and driver data */

	htcpld = platform_get_drvdata(pdev);

	chip = &htcpld->chip[chip_index];



	i2c_unregister_device(chip->client);

}



static int htcpld_register_chip_gpio(

		struct platform_device *pdev,

		int chip_index)

{

	struct htcpld_data *htcpld;

	struct device *dev = &pdev->dev;

	struct htcpld_core_platform_data *pdata;

	struct htcpld_chip *chip;

	struct htcpld_chip_platform_data *plat_chip_data;

	struct gpio_chip *gpio_chip;

	int ret = 0;



	/* Get the platform and driver data */

	pdata = dev_get_platdata(dev);

	htcpld = platform_get_drvdata(pdev);

	chip = &htcpld->chip[chip_index];

	plat_chip_data = &pdata->chip[chip_index];



	/* Setup the GPIO chips */

	gpio_chip = &(chip->chip_out);

	gpio_chip->label           = "htcpld-out";

	gpio_chip->parent             = dev;

	gpio_chip->owner           = THIS_MODULE;

	gpio_chip->get             = htcpld_chip_get;

	gpio_chip->set             = htcpld_chip_set;

	gpio_chip->direction_input = NULL;

	gpio_chip->direction_output = htcpld_direction_output;

	gpio_chip->base            = plat_chip_data->gpio_out_base;

	gpio_chip->ngpio           = plat_chip_data->num_gpios;



	gpio_chip = &(chip->chip_in);

	gpio_chip->label           = "htcpld-in";

	gpio_chip->parent             = dev;

	gpio_chip->owner           = THIS_MODULE;

	gpio_chip->get             = htcpld_chip_get;

	gpio_chip->set             = NULL;

	gpio_chip->direction_input = htcpld_direction_input;

	gpio_chip->direction_output = NULL;

	gpio_chip->to_irq          = htcpld_chip_to_irq;

	gpio_chip->base            = plat_chip_data->gpio_in_base;

	gpio_chip->ngpio           = plat_chip_data->num_gpios;



	/* Add the GPIO chips */

	ret = gpiochip_add_data(&(chip->chip_out), chip);

	if (ret) {

		dev_warn(dev, "Unable to register output GPIOs for 0x%x: %d\n",

			 plat_chip_data->addr, ret);

		return ret;

	}



	ret = gpiochip_add_data(&(chip->chip_in), chip);

	if (ret) {

		dev_warn(dev, "Unable to register input GPIOs for 0x%x: %d\n",

			 plat_chip_data->addr, ret);

		gpiochip_remove(&(chip->chip_out));

		return ret;

	}



	return 0;

}



static int htcpld_setup_chips(struct platform_device *pdev)

{

	struct htcpld_data *htcpld;

	struct device *dev = &pdev->dev;

	struct htcpld_core_platform_data *pdata;

	int i;



	/* Get the platform and driver data */

	pdata = dev_get_platdata(dev);

	htcpld = platform_get_drvdata(pdev);



	/* Setup each chip's output GPIOs */

	htcpld->nchips = pdata->num_chip;

	htcpld->chip = devm_kcalloc(dev,

				    htcpld->nchips,

				    sizeof(struct htcpld_chip),

				    GFP_KERNEL);

	if (!htcpld->chip)

		return -ENOMEM;



	/* Add the chips as best we can */

	for (i = 0; i < htcpld->nchips; i++) {

		int ret;



		/* Setup the HTCPLD chips */

		htcpld->chip[i].reset = pdata->chip[i].reset;

		htcpld->chip[i].cache_out = pdata->chip[i].reset;

		htcpld->chip[i].cache_in = 0;

		htcpld->chip[i].dev = dev;

		htcpld->chip[i].irq_start = pdata->chip[i].irq_base;

		htcpld->chip[i].nirqs = pdata->chip[i].num_irqs;



		INIT_WORK(&(htcpld->chip[i].set_val_work), &htcpld_chip_set_ni);

		spin_lock_init(&(htcpld->chip[i].lock));



		/* Setup the interrupts for the chip */

		if (htcpld->chained_irq) {

			ret = htcpld_setup_chip_irq(pdev, i);

			if (ret)

				continue;

		}



		/* Register the chip with I2C */

		ret = htcpld_register_chip_i2c(pdev, i);

		if (ret)

			continue;





		/* Register the chips with the GPIO subsystem */

		ret = htcpld_register_chip_gpio(pdev, i);

		if (ret) {

			/* Unregister the chip from i2c and continue */

			htcpld_unregister_chip_i2c(pdev, i);

			continue;

		}



		dev_info(dev, "Registered chip at 0x%x\n", pdata->chip[i].addr);

	}



	return 0;

}



static int htcpld_core_probe(struct platform_device *pdev)

{

	struct htcpld_data *htcpld;

	struct device *dev = &pdev->dev;

	struct htcpld_core_platform_data *pdata;

	struct resource *res;

	int ret = 0;



	if (!dev)

		return -ENODEV;



	pdata = dev_get_platdata(dev);

	if (!pdata) {

		dev_warn(dev, "Platform data not found for htcpld core!\n");

		return -ENXIO;

	}



	htcpld = devm_kzalloc(dev, sizeof(struct htcpld_data), GFP_KERNEL);

	if (!htcpld)

		return -ENOMEM;



	/* Find chained irq */

	res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);

	if (res) {

		int flags;

		htcpld->chained_irq = res->start;



		/* Setup the chained interrupt handler */

		flags = IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING |

			IRQF_ONESHOT;

		ret = request_threaded_irq(htcpld->chained_irq,

					   NULL, htcpld_handler,

					   flags, pdev->name, htcpld);

		if (ret) {

			dev_warn(dev, "Unable to setup chained irq handler: %d\n", ret);

			return ret;

		} else

			device_init_wakeup(dev, 0);

	}



	/* Set the driver data */

	platform_set_drvdata(pdev, htcpld);



	/* Setup the htcpld chips */

	ret = htcpld_setup_chips(pdev);

	if (ret)

		return ret;



	/* Request the GPIO(s) for the int reset and set them up */

	htcpld->int_reset_gpio_hi = gpiochip_request_own_desc(&htcpld->chip[2].chip_out,

							      7, "htcpld-core", GPIO_ACTIVE_HIGH,

							      GPIOD_OUT_HIGH);

	if (IS_ERR(htcpld->int_reset_gpio_hi)) {

		/*

		 * If it failed, that sucks, but we can probably

		 * continue on without it.

		 */

		htcpld->int_reset_gpio_hi = NULL;

		dev_warn(dev, "Unable to request int_reset_gpio_hi -- interrupts may not work\n");

	}



	htcpld->int_reset_gpio_lo = gpiochip_request_own_desc(&htcpld->chip[2].chip_out,

							      0, "htcpld-core", GPIO_ACTIVE_HIGH,

							      GPIOD_OUT_LOW);

	if (IS_ERR(htcpld->int_reset_gpio_lo)) {

		/*

		 * If it failed, that sucks, but we can probably

		 * continue on without it.

		 */

		htcpld->int_reset_gpio_lo = NULL;

		dev_warn(dev, "Unable to request int_reset_gpio_lo -- interrupts may not work\n");

	}



	dev_info(dev, "Initialized successfully\n");

	return 0;

}



/* The I2C Driver -- used internally */

static const struct i2c_device_id htcpld_chip_id[] = {

	{ "htcpld-chip", 0 },

	{ }

};



static struct i2c_driver htcpld_chip_driver = {

	.driver = {

		.name	= "htcpld-chip",

	},

	.id_table = htcpld_chip_id,

};



/* The Core Driver */

static struct platform_driver htcpld_core_driver = {

	.driver = {

		.name = "i2c-htcpld",

	},

};



static int __init htcpld_core_init(void)

{

	int ret;



	/* Register the I2C Chip driver */

	ret = i2c_add_driver(&htcpld_chip_driver);

	if (ret)

		return ret;



	/* Probe for our chips */

	return platform_driver_probe(&htcpld_core_driver, htcpld_core_probe);

}

device_initcall(htcpld_core_init);

include/linux/htcpld.h

deleted100644 → 0
+0 −23
Original line number Diff line number Diff line 
/* SPDX-License-Identifier: GPL-2.0 */

#ifndef __LINUX_HTCPLD_H

#define __LINUX_HTCPLD_H



struct htcpld_chip_platform_data {

	unsigned int addr;

	unsigned int reset;

	unsigned int num_gpios;

	unsigned int gpio_out_base;

	unsigned int gpio_in_base;

	unsigned int irq_base;

	unsigned int num_irqs;

};



struct htcpld_core_platform_data {

	unsigned int                      i2c_adapter_id;



	struct htcpld_chip_platform_data  *chip;

	unsigned int                      num_chip;

};



#endif /* __LINUX_HTCPLD_H */