[PATCH v2 0/6] Migrate IDIO-16 GPIO drivers to regmap API

[PATCH v2 0/6] Migrate IDIO-16 GPIO drivers to regmap API

[William Breathitt Gray]

Changes in v2:
 - Utilize memset32() to set status_buf for no_status case
 - Utilize GENMASK() to generate status_buf mask
 - Move no_status kernel doc line under runtime_pm line
 - Add comma to end of idio_16_names initialization list
 - Set io_port to true in idio_16_regmap_config

The regmap API supports IO port accessors so we can take advantage of
regmap abstractions rather than handling access to the device registers
directly in the driver. The 104-idio-16 and pci-idio-16 modules depend
on the IDIO-16 library and are thus updated accordingly.

The 104-IDIO-16 lacks a status register (as does the 104-DIO-48E), so a
no_status flag is introduced to the regmap-irq API to properly handle
such cases and avoid hacks. The 104-dio-48e module is updated in a
subsequent patch to take advantage of this new no_status flag.

By leveraging the regmap API, the idio-16 library is reduced to simply a
devm_idio_16_regmap_register() function and a configuration structure
struct idio_16_regmap_config.

William Breathitt Gray (6):
  regmap-irq: Add no_status support
  gpio: 104-dio-48e: Utilize no_status regmap-irq flag
  gpio: idio-16: Migrate to the regmap API
  gpio: 104-idio-16: Migrate to the regmap API
  gpio: pci-idio-16: Migrate to the regmap API
  gpio: idio-16: Remove unused legacy interface

 drivers/base/regmap/regmap-irq.c |  22 ++-
 drivers/gpio/Kconfig             |   7 +-
 drivers/gpio/gpio-104-dio-48e.c  |   6 +-
 drivers/gpio/gpio-104-idio-16.c  | 294 ++++++++----------------------
 drivers/gpio/gpio-idio-16.c      | 255 ++++++++++++++------------
 drivers/gpio/gpio-idio-16.h      |  80 +++------
 drivers/gpio/gpio-pci-idio-16.c  | 296 +++++++------------------------
 include/linux/regmap.h           |   2 +
 8 files changed, 326 insertions(+), 636 deletions(-)


base-commit: 4827aae061337251bb91801b316157a78b845ec7
-- 
2.39.2

[PATCH v2 1/6] regmap-irq: Add no_status support

[William Breathitt Gray]

Some devices lack status registers, yet expect to handle interrupts.
Introduce a no_status flag to indicate such a configuration, where
rather than read a status register to verify, all interrupts received
are assumed to be active.

Cc: Mark Brown <broonie@kernel.org>
Signed-off-by: William Breathitt Gray <william.gray@linaro.org>
---
Changes in v2:
 - Utilize memset32() to set status_buf for no_status case
 - Utilize GENMASK() to generate status_buf mask
 - Move no_status kernel doc line under runtime_pm line

 drivers/base/regmap/regmap-irq.c | 22 +++++++++++++++-------
 include/linux/regmap.h           |  2 ++
 2 files changed, 17 insertions(+), 7 deletions(-)

diff --git a/drivers/base/regmap/regmap-irq.c b/drivers/base/regmap/regmap-irq.c
index a8f185430a07..290e26664a21 100644
--- a/drivers/base/regmap/regmap-irq.c
+++ b/drivers/base/regmap/regmap-irq.c
@@ -437,7 +437,10 @@ static irqreturn_t regmap_irq_thread(int irq, void *d)
 	 * possible in order to reduce the I/O overheads.
 	 */
 
-	if (chip->num_main_regs) {
+	if (chip->no_status) {
+		/* no status register so default to all active */
+		memset32(data->status_buf, GENMASK(31, 0), chip->num_regs);
+	} else if (chip->num_main_regs) {
 		unsigned int max_main_bits;
 		unsigned long size;
 
@@ -967,12 +970,17 @@ int regmap_add_irq_chip_fwnode(struct fwnode_handle *fwnode,
 			continue;
 
 		/* Ack masked but set interrupts */
-		reg = d->get_irq_reg(d, d->chip->status_base, i);
-		ret = regmap_read(map, reg, &d->status_buf[i]);
-		if (ret != 0) {
-			dev_err(map->dev, "Failed to read IRQ status: %d\n",
-				ret);
-			goto err_alloc;
+		if (d->chip->no_status) {
+			/* no status register so default to all active */
+			d->status_buf[i] = GENMASK(31, 0);
+		} else {
+			reg = d->get_irq_reg(d, d->chip->status_base, i);
+			ret = regmap_read(map, reg, &d->status_buf[i]);
+			if (ret != 0) {
+				dev_err(map->dev, "Failed to read IRQ status: %d\n",
+					ret);
+				goto err_alloc;
+			}
 		}
 
 		if (chip->status_invert)
diff --git a/include/linux/regmap.h b/include/linux/regmap.h
index a3bc695bcca0..c6d80d4e73de 100644
--- a/include/linux/regmap.h
+++ b/include/linux/regmap.h
@@ -1564,6 +1564,7 @@ struct regmap_irq_chip_data;
  *		      the need for a @sub_reg_offsets table.
  * @status_invert: Inverted status register: cleared bits are active interrupts.
  * @runtime_pm:  Hold a runtime PM lock on the device when accessing it.
+ * @no_status: No status register: all interrupts assumed generated by device.
  *
  * @num_regs:    Number of registers in each control bank.
  * @irqs:        Descriptors for individual IRQs.  Interrupt numbers are
@@ -1630,6 +1631,7 @@ struct regmap_irq_chip {
 	unsigned int clear_on_unmask:1;
 	unsigned int not_fixed_stride:1;
 	unsigned int status_invert:1;
+	unsigned int no_status:1;
 
 	int num_regs;
 
-- 
2.39.2

[PATCH v2 2/6] gpio: 104-dio-48e: Utilize no_status regmap-irq flag

[William Breathitt Gray]

The 104-DIO-48E lacks an IRQ status register. Rather than use the Clear
Interrupt register as the status register, set the no_status flag to
true and thus avoid such a hack.

Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: William Breathitt Gray <william.gray@linaro.org>
---
 drivers/gpio/gpio-104-dio-48e.c | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/drivers/gpio/gpio-104-dio-48e.c b/drivers/gpio/gpio-104-dio-48e.c
index a3846faf3780..fe3c93bfe4bd 100644
--- a/drivers/gpio/gpio-104-dio-48e.c
+++ b/drivers/gpio/gpio-104-dio-48e.c
@@ -195,13 +195,9 @@ static int dio48e_probe(struct device *dev, unsigned int id)
 		return -ENOMEM;
 
 	chip->name = name;
-	/* No IRQ status register so use CLEAR_INTERRUPT register instead */
-	chip->status_base = DIO48E_CLEAR_INTERRUPT;
 	chip->mask_base = DIO48E_ENABLE_INTERRUPT;
 	chip->ack_base = DIO48E_CLEAR_INTERRUPT;
-	/* CLEAR_INTERRUPT doubles as status register so we need it cleared */
-	chip->clear_ack = true;
-	chip->status_invert = true;
+	chip->no_status = true;
 	chip->num_regs = 1;
 	chip->irqs = dio48e_regmap_irqs;
 	chip->num_irqs = ARRAY_SIZE(dio48e_regmap_irqs);
-- 
2.39.2

[PATCH v2 3/6] gpio: idio-16: Migrate to the regmap API

[William Breathitt Gray]

The regmap API supports IO port accessors so we can take advantage of
regmap abstractions rather than handling access to the device registers
directly in the driver.

By leveraging the regmap API, the idio-16 library is reduced to simply a
devm_idio_16_regmap_register() function and a configuration structure
struct idio_16_regmap_config.

Legacy functions and code will be removed once all consumers have
migrated to the new idio-16 library interface.

For IDIO-16 devices we have the following IRQ registers:

    Base Address +1 (Write): Clear Interrupt
    Base Address +2 (Read): Enable Interrupt
    Base Address +2 (Write): Disable Interrupt

An interrupt is asserted whenever a change-of-state is detected on any
of the inputs. Any write to 0x2 will disable interrupts, while any read
will enable interrupts. Interrupts are cleared by a write to 0x1.

For 104-IDIO-16 devices, there is no IRQ status register, so software
has to assume that if an interrupt is raised then it was for the
104-IDIO-16 device.

For PCI-IDIO-16 devices, there is an additional IRQ register:

    Base Address +6 (Read): Interrupt Status

Interrupt status can be read from 0x6 where bit 2 set indicates that an
IRQ has been generated.

Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: William Breathitt Gray <william.gray@linaro.org>
---
Changes in v2:
 - Add comma to end of idio_16_names initialization list

 drivers/gpio/Kconfig        |   3 +
 drivers/gpio/gpio-idio-16.c | 158 ++++++++++++++++++++++++++++++++++++
 drivers/gpio/gpio-idio-16.h |  28 +++++++
 3 files changed, 189 insertions(+)

diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 406e8bda487f..b4de83a3616d 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -111,6 +111,9 @@ config GPIO_MAX730X
 
 config GPIO_IDIO_16
 	tristate
+	select REGMAP_IRQ
+	select GPIOLIB_IRQCHIP
+	select GPIO_REGMAP
 	help
 	  Enables support for the idio-16 library functions. The idio-16 library
 	  provides functions to facilitate communication with devices within the
diff --git a/drivers/gpio/gpio-idio-16.c b/drivers/gpio/gpio-idio-16.c
index 13315242d220..13e35d1ef658 100644
--- a/drivers/gpio/gpio-idio-16.c
+++ b/drivers/gpio/gpio-idio-16.c
@@ -4,9 +4,13 @@
  * Copyright (C) 2022 William Breathitt Gray
  */
 #include <linux/bitmap.h>
+#include <linux/device.h>
+#include <linux/err.h>
 #include <linux/export.h>
+#include <linux/gpio/regmap.h>
 #include <linux/io.h>
 #include <linux/module.h>
+#include <linux/regmap.h>
 #include <linux/spinlock.h>
 #include <linux/types.h>
 
@@ -14,6 +18,160 @@
 
 #define DEFAULT_SYMBOL_NAMESPACE GPIO_IDIO_16
 
+#define IDIO_16_DAT_BASE 0x0
+#define IDIO_16_OUT_BASE IDIO_16_DAT_BASE
+#define IDIO_16_IN_BASE (IDIO_16_DAT_BASE + 1)
+#define IDIO_16_CLEAR_INTERRUPT 0x1
+#define IDIO_16_ENABLE_IRQ 0x2
+#define IDIO_16_DEACTIVATE_INPUT_FILTERS 0x3
+#define IDIO_16_DISABLE_IRQ IDIO_16_ENABLE_IRQ
+#define IDIO_16_INTERRUPT_STATUS 0x6
+
+#define IDIO_16_NGPIO 32
+#define IDIO_16_NGPIO_PER_REG 8
+#define IDIO_16_REG_STRIDE 4
+
+static int idio_16_handle_mask_sync(struct regmap *const map, const int index,
+				   const unsigned int mask_buf_def,
+				   const unsigned int mask_buf,
+				   void *const irq_drv_data)
+{
+	unsigned int *const irq_mask = irq_drv_data;
+	const unsigned int prev_mask = *irq_mask;
+	int err;
+	unsigned int val;
+
+	/* exit early if no change since the previous mask */
+	if (mask_buf == prev_mask)
+		return 0;
+
+	/* remember the current mask for the next mask sync */
+	*irq_mask = mask_buf;
+
+	/* if all previously masked, enable interrupts when unmasking */
+	if (prev_mask == mask_buf_def) {
+		err = regmap_write(map, IDIO_16_CLEAR_INTERRUPT, 0x00);
+		if (err)
+			return err;
+		return regmap_read(map, IDIO_16_ENABLE_IRQ, &val);
+	}
+
+	/* if all are currently masked, disable interrupts */
+	if (mask_buf == mask_buf_def)
+		return regmap_write(map, IDIO_16_DISABLE_IRQ, 0x00);
+
+	return 0;
+}
+
+static int idio_16_reg_mask_xlate(struct gpio_regmap *gpio, unsigned int base,
+				  unsigned int offset, unsigned int *reg,
+				  unsigned int *mask)
+{
+	unsigned int stride;
+
+	if (base != IDIO_16_DAT_BASE) {
+		/* Should never reach this path */
+		return -EINVAL;
+	}
+
+	/* Input lines start at GPIO 16 */
+	if (offset < 16) {
+		stride = offset / IDIO_16_NGPIO_PER_REG;
+		*reg = IDIO_16_OUT_BASE + stride * IDIO_16_REG_STRIDE;
+	} else {
+		stride = (offset - 16) / IDIO_16_NGPIO_PER_REG;
+		*reg = IDIO_16_IN_BASE + stride * IDIO_16_REG_STRIDE;
+	}
+
+	*mask = BIT(offset % IDIO_16_NGPIO_PER_REG);
+
+	return 0;
+}
+
+static const char *idio_16_names[IDIO_16_NGPIO] = {
+	"OUT0", "OUT1", "OUT2", "OUT3", "OUT4", "OUT5", "OUT6", "OUT7",
+	"OUT8", "OUT9", "OUT10", "OUT11", "OUT12", "OUT13", "OUT14", "OUT15",
+	"IIN0", "IIN1", "IIN2", "IIN3", "IIN4", "IIN5", "IIN6", "IIN7",
+	"IIN8", "IIN9", "IIN10", "IIN11", "IIN12", "IIN13", "IIN14", "IIN15",
+};
+
+/**
+ * devm_idio_16_regmap_register - Register an IDIO-16 GPIO device
+ * @dev:	device that is registering this IDIO-16 GPIO device
+ * @config:	configuration for idio_16_regmap_config
+ *
+ * Registers an IDIO-16 GPIO device. Returns 0 on success and negative error
+ * number on failure.
+ */
+int devm_idio_16_regmap_register(struct device *const dev,
+				 const struct idio_16_regmap_config *const config)
+{
+	struct gpio_regmap_config gpio_config = {};
+	int err;
+	struct regmap_irq_chip *chip;
+	unsigned int irq_mask;
+	struct regmap_irq_chip_data *chip_data;
+
+	if (!config->parent)
+		return -EINVAL;
+
+	if (!config->map)
+		return -EINVAL;
+
+	if (!config->regmap_irqs)
+		return -EINVAL;
+
+	chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL);
+	if (!chip)
+		return -ENOMEM;
+
+	chip->irq_drv_data = devm_kzalloc(dev, sizeof(irq_mask), GFP_KERNEL);
+	if (!chip->irq_drv_data)
+		return -ENOMEM;
+
+	chip->name = dev_name(dev);
+	chip->status_base = IDIO_16_INTERRUPT_STATUS;
+	chip->mask_base = IDIO_16_ENABLE_IRQ;
+	chip->ack_base = IDIO_16_CLEAR_INTERRUPT;
+	chip->no_status = config->no_status;
+	chip->num_regs = 1;
+	chip->irqs = config->regmap_irqs;
+	chip->num_irqs = config->num_regmap_irqs;
+	chip->handle_mask_sync = idio_16_handle_mask_sync;
+
+	/* Disable IRQ to prevent spurious interrupts before we're ready */
+	err = regmap_write(config->map, IDIO_16_DISABLE_IRQ, 0x00);
+	if (err)
+		return err;
+
+	err = devm_regmap_add_irq_chip(dev, config->map, config->irq, 0, 0,
+				       chip, &chip_data);
+	if (err)
+		return dev_err_probe(dev, err, "IRQ registration failed\n");
+
+	if (config->filters) {
+		/* Deactivate input filters */
+		err = regmap_write(config->map,
+				   IDIO_16_DEACTIVATE_INPUT_FILTERS, 0x00);
+		if (err)
+			return err;
+	}
+
+	gpio_config.parent = config->parent;
+	gpio_config.regmap = config->map;
+	gpio_config.ngpio = IDIO_16_NGPIO;
+	gpio_config.names = idio_16_names;
+	gpio_config.reg_dat_base = GPIO_REGMAP_ADDR(IDIO_16_DAT_BASE);
+	gpio_config.reg_set_base = GPIO_REGMAP_ADDR(IDIO_16_DAT_BASE);
+	gpio_config.ngpio_per_reg = IDIO_16_NGPIO_PER_REG;
+	gpio_config.reg_stride = IDIO_16_REG_STRIDE;
+	gpio_config.irq_domain = regmap_irq_get_domain(chip_data);
+	gpio_config.reg_mask_xlate = idio_16_reg_mask_xlate;
+
+	return PTR_ERR_OR_ZERO(devm_gpio_regmap_register(dev, &gpio_config));
+}
+EXPORT_SYMBOL_GPL(devm_idio_16_regmap_register);
+
 /**
  * idio_16_get - get signal value at signal offset
  * @reg:	ACCES IDIO-16 device registers
diff --git a/drivers/gpio/gpio-idio-16.h b/drivers/gpio/gpio-idio-16.h
index 928f8251a2bd..22bb591b4ec0 100644
--- a/drivers/gpio/gpio-idio-16.h
+++ b/drivers/gpio/gpio-idio-16.h
@@ -6,6 +6,30 @@
 #include <linux/spinlock.h>
 #include <linux/types.h>
 
+struct device;
+struct regmap;
+struct regmap_irq;
+
+/**
+ * struct idio_16_regmap_config - Configuration for the IDIO-16 register map
+ * @parent:		parent device
+ * @map:		regmap for the IDIO-16 device
+ * @regmap_irqs:	descriptors for individual IRQs
+ * @num_regmap_irqs:	number of IRQ descriptors
+ * @irq:		IRQ number for the IDIO-16 device
+ * @no_status:		device has no status register
+ * @filters:		device has input filters
+ */
+struct idio_16_regmap_config {
+	struct device *parent;
+	struct regmap *map;
+	const struct regmap_irq *regmap_irqs;
+	int num_regmap_irqs;
+	unsigned int irq;
+	bool no_status;
+	bool filters;
+};
+
 /**
  * struct idio_16 - IDIO-16 registers structure
  * @out0_7:	Read: FET Drive Outputs 0-7
@@ -39,6 +63,7 @@ struct idio_16 {
  * struct idio_16_state - IDIO-16 state structure
  * @lock:	synchronization lock for accessing device state
  * @out_state:	output signals state
+ * @irq_mask:	IRQ mask state
  */
 struct idio_16_state {
 	spinlock_t lock;
@@ -68,4 +93,7 @@ void idio_16_set_multiple(struct idio_16 __iomem *reg,
 			  const unsigned long *mask, const unsigned long *bits);
 void idio_16_state_init(struct idio_16_state *state);
 
+int devm_idio_16_regmap_register(struct device *dev,
+				 const struct idio_16_regmap_config *config);
+
 #endif /* _IDIO_16_H_ */
-- 
2.39.2

[PATCH v2 4/6] gpio: 104-idio-16: Migrate to the regmap API

[William Breathitt Gray]

The regmap API supports IO port accessors so we can take advantage of
regmap abstractions rather than handling access to the device registers
directly in the driver. Migrate the 104-idio-16 module to the new
idio-16 library interface leveraging the gpio-regmap API.

Suggested-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: William Breathitt Gray <william.gray@linaro.org>
---
 drivers/gpio/Kconfig            |   2 +-
 drivers/gpio/gpio-104-idio-16.c | 294 ++++++++------------------------
 2 files changed, 72 insertions(+), 224 deletions(-)

diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index b4de83a3616d..8eb1f21c019e 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -863,7 +863,7 @@ config GPIO_104_IDIO_16
 	tristate "ACCES 104-IDIO-16 GPIO support"
 	depends on PC104
 	select ISA_BUS_API
-	select GPIOLIB_IRQCHIP
+	select REGMAP_MMIO
 	select GPIO_IDIO_16
 	help
 	  Enables GPIO support for the ACCES 104-IDIO-16 family (104-IDIO-16,
diff --git a/drivers/gpio/gpio-104-idio-16.c b/drivers/gpio/gpio-104-idio-16.c
index 098fbefdbe22..79d3a089061e 100644
--- a/drivers/gpio/gpio-104-idio-16.c
+++ b/drivers/gpio/gpio-104-idio-16.c
@@ -6,19 +6,16 @@
  * This driver supports the following ACCES devices: 104-IDIO-16,
  * 104-IDIO-16E, 104-IDO-16, 104-IDIO-8, 104-IDIO-8E, and 104-IDO-8.
  */
-#include <linux/bitmap.h>
+#include <linux/bits.h>
 #include <linux/device.h>
-#include <linux/errno.h>
-#include <linux/gpio/driver.h>
-#include <linux/io.h>
+#include <linux/err.h>
 #include <linux/ioport.h>
-#include <linux/interrupt.h>
-#include <linux/irqdesc.h>
+#include <linux/irq.h>
 #include <linux/isa.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/moduleparam.h>
-#include <linux/spinlock.h>
+#include <linux/regmap.h>
 #include <linux/types.h>
 
 #include "gpio-idio-16.h"
@@ -36,187 +33,69 @@ static unsigned int num_irq;
 module_param_hw_array(irq, uint, irq, &num_irq, 0);
 MODULE_PARM_DESC(irq, "ACCES 104-IDIO-16 interrupt line numbers");
 
-/**
- * struct idio_16_gpio - GPIO device private data structure
- * @chip:	instance of the gpio_chip
- * @lock:	synchronization lock to prevent I/O race conditions
- * @irq_mask:	I/O bits affected by interrupts
- * @reg:	I/O address offset for the device registers
- * @state:	ACCES IDIO-16 device state
- */
-struct idio_16_gpio {
-	struct gpio_chip chip;
-	raw_spinlock_t lock;
-	unsigned long irq_mask;
-	struct idio_16 __iomem *reg;
-	struct idio_16_state state;
+static const struct regmap_range idio_16_wr_ranges[] = {
+	regmap_reg_range(0x0, 0x2), regmap_reg_range(0x4, 0x4),
 };
-
-static int idio_16_gpio_get_direction(struct gpio_chip *chip,
-				      unsigned int offset)
-{
-	if (idio_16_get_direction(offset))
-		return GPIO_LINE_DIRECTION_IN;
-
-	return GPIO_LINE_DIRECTION_OUT;
-}
-
-static int idio_16_gpio_direction_input(struct gpio_chip *chip,
-					unsigned int offset)
-{
-	return 0;
-}
-
-static int idio_16_gpio_direction_output(struct gpio_chip *chip,
-	unsigned int offset, int value)
-{
-	chip->set(chip, offset, value);
-	return 0;
-}
-
-static int idio_16_gpio_get(struct gpio_chip *chip, unsigned int offset)
-{
-	struct idio_16_gpio *const idio16gpio = gpiochip_get_data(chip);
-
-	return idio_16_get(idio16gpio->reg, &idio16gpio->state, offset);
-}
-
-static int idio_16_gpio_get_multiple(struct gpio_chip *chip,
-	unsigned long *mask, unsigned long *bits)
-{
-	struct idio_16_gpio *const idio16gpio = gpiochip_get_data(chip);
-
-	idio_16_get_multiple(idio16gpio->reg, &idio16gpio->state, mask, bits);
-
-	return 0;
-}
-
-static void idio_16_gpio_set(struct gpio_chip *chip, unsigned int offset,
-			     int value)
-{
-	struct idio_16_gpio *const idio16gpio = gpiochip_get_data(chip);
-
-	idio_16_set(idio16gpio->reg, &idio16gpio->state, offset, value);
-}
-
-static void idio_16_gpio_set_multiple(struct gpio_chip *chip,
-	unsigned long *mask, unsigned long *bits)
-{
-	struct idio_16_gpio *const idio16gpio = gpiochip_get_data(chip);
-
-	idio_16_set_multiple(idio16gpio->reg, &idio16gpio->state, mask, bits);
-}
-
-static void idio_16_irq_ack(struct irq_data *data)
-{
-}
-
-static void idio_16_irq_mask(struct irq_data *data)
-{
-	struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
-	struct idio_16_gpio *const idio16gpio = gpiochip_get_data(chip);
-	const unsigned long offset = irqd_to_hwirq(data);
-	unsigned long flags;
-
-	idio16gpio->irq_mask &= ~BIT(offset);
-	gpiochip_disable_irq(chip, offset);
-
-	if (!idio16gpio->irq_mask) {
-		raw_spin_lock_irqsave(&idio16gpio->lock, flags);
-
-		iowrite8(0, &idio16gpio->reg->irq_ctl);
-
-		raw_spin_unlock_irqrestore(&idio16gpio->lock, flags);
-	}
-}
-
-static void idio_16_irq_unmask(struct irq_data *data)
-{
-	struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
-	struct idio_16_gpio *const idio16gpio = gpiochip_get_data(chip);
-	const unsigned long offset = irqd_to_hwirq(data);
-	const unsigned long prev_irq_mask = idio16gpio->irq_mask;
-	unsigned long flags;
-
-	gpiochip_enable_irq(chip, offset);
-	idio16gpio->irq_mask |= BIT(offset);
-
-	if (!prev_irq_mask) {
-		raw_spin_lock_irqsave(&idio16gpio->lock, flags);
-
-		ioread8(&idio16gpio->reg->irq_ctl);
-
-		raw_spin_unlock_irqrestore(&idio16gpio->lock, flags);
-	}
-}
-
-static int idio_16_irq_set_type(struct irq_data *data, unsigned int flow_type)
-{
-	/* The only valid irq types are none and both-edges */
-	if (flow_type != IRQ_TYPE_NONE &&
-		(flow_type & IRQ_TYPE_EDGE_BOTH) != IRQ_TYPE_EDGE_BOTH)
-		return -EINVAL;
-
-	return 0;
-}
-
-static const struct irq_chip idio_16_irqchip = {
-	.name = "104-idio-16",
-	.irq_ack = idio_16_irq_ack,
-	.irq_mask = idio_16_irq_mask,
-	.irq_unmask = idio_16_irq_unmask,
-	.irq_set_type = idio_16_irq_set_type,
-	.flags = IRQCHIP_IMMUTABLE,
-	GPIOCHIP_IRQ_RESOURCE_HELPERS,
+static const struct regmap_range idio_16_rd_ranges[] = {
+	regmap_reg_range(0x1, 0x2), regmap_reg_range(0x5, 0x5),
 };
-
-static irqreturn_t idio_16_irq_handler(int irq, void *dev_id)
-{
-	struct idio_16_gpio *const idio16gpio = dev_id;
-	struct gpio_chip *const chip = &idio16gpio->chip;
-	int gpio;
-
-	for_each_set_bit(gpio, &idio16gpio->irq_mask, chip->ngpio)
-		generic_handle_domain_irq(chip->irq.domain, gpio);
-
-	raw_spin_lock(&idio16gpio->lock);
-
-	iowrite8(0, &idio16gpio->reg->in0_7);
-
-	raw_spin_unlock(&idio16gpio->lock);
-
-	return IRQ_HANDLED;
-}
-
-#define IDIO_16_NGPIO 32
-static const char *idio_16_names[IDIO_16_NGPIO] = {
-	"OUT0", "OUT1", "OUT2", "OUT3", "OUT4", "OUT5", "OUT6", "OUT7",
-	"OUT8", "OUT9", "OUT10", "OUT11", "OUT12", "OUT13", "OUT14", "OUT15",
-	"IIN0", "IIN1", "IIN2", "IIN3", "IIN4", "IIN5", "IIN6", "IIN7",
-	"IIN8", "IIN9", "IIN10", "IIN11", "IIN12", "IIN13", "IIN14", "IIN15"
+static const struct regmap_range idio_16_volatile_ranges[] = {
+	regmap_reg_range(0x1, 0x2), regmap_reg_range(0x5, 0x5),
+};
+static const struct regmap_range idio_16_precious_ranges[] = {
+	regmap_reg_range(0x2, 0x2),
+};
+static const struct regmap_access_table idio_16_wr_table = {
+	.yes_ranges = idio_16_wr_ranges,
+	.n_yes_ranges = ARRAY_SIZE(idio_16_wr_ranges),
+};
+static const struct regmap_access_table idio_16_rd_table = {
+	.yes_ranges = idio_16_rd_ranges,
+	.n_yes_ranges = ARRAY_SIZE(idio_16_rd_ranges),
+};
+static const struct regmap_access_table idio_16_volatile_table = {
+	.yes_ranges = idio_16_volatile_ranges,
+	.n_yes_ranges = ARRAY_SIZE(idio_16_volatile_ranges),
+};
+static const struct regmap_access_table idio_16_precious_table = {
+	.yes_ranges = idio_16_precious_ranges,
+	.n_yes_ranges = ARRAY_SIZE(idio_16_precious_ranges),
+};
+static const struct regmap_config idio_16_regmap_config = {
+	.reg_bits = 8,
+	.reg_stride = 1,
+	.val_bits = 8,
+	.io_port = true,
+	.max_register = 0x5,
+	.wr_table = &idio_16_wr_table,
+	.rd_table = &idio_16_rd_table,
+	.volatile_table = &idio_16_volatile_table,
+	.precious_table = &idio_16_precious_table,
+	.cache_type = REGCACHE_FLAT,
 };
 
-static int idio_16_irq_init_hw(struct gpio_chip *gc)
-{
-	struct idio_16_gpio *const idio16gpio = gpiochip_get_data(gc);
-
-	/* Disable IRQ by default */
-	iowrite8(0, &idio16gpio->reg->irq_ctl);
-	iowrite8(0, &idio16gpio->reg->in0_7);
+/* Only input lines (GPIO 16-31) support interrupts */
+#define IDIO_16_REGMAP_IRQ(_id)						\
+	[16 + _id] = {							\
+		.mask = BIT(_id),					\
+		.type = { .types_supported = IRQ_TYPE_EDGE_BOTH },	\
+	}
 
-	return 0;
-}
+static const struct regmap_irq idio_16_regmap_irqs[] = {
+	IDIO_16_REGMAP_IRQ(0), IDIO_16_REGMAP_IRQ(1), IDIO_16_REGMAP_IRQ(2), /* 0-2 */
+	IDIO_16_REGMAP_IRQ(3), IDIO_16_REGMAP_IRQ(4), IDIO_16_REGMAP_IRQ(5), /* 3-5 */
+	IDIO_16_REGMAP_IRQ(6), IDIO_16_REGMAP_IRQ(7), IDIO_16_REGMAP_IRQ(8), /* 6-8 */
+	IDIO_16_REGMAP_IRQ(9), IDIO_16_REGMAP_IRQ(10), IDIO_16_REGMAP_IRQ(11), /* 9-11 */
+	IDIO_16_REGMAP_IRQ(12), IDIO_16_REGMAP_IRQ(13), IDIO_16_REGMAP_IRQ(14), /* 12-14 */
+	IDIO_16_REGMAP_IRQ(15), /* 15 */
+};
 
 static int idio_16_probe(struct device *dev, unsigned int id)
 {
-	struct idio_16_gpio *idio16gpio;
 	const char *const name = dev_name(dev);
-	struct gpio_irq_chip *girq;
-	int err;
-
-	idio16gpio = devm_kzalloc(dev, sizeof(*idio16gpio), GFP_KERNEL);
-	if (!idio16gpio)
-		return -ENOMEM;
+	struct idio_16_regmap_config config = {};
+	void __iomem *regs;
+	struct regmap *map;
 
 	if (!devm_request_region(dev, base[id], IDIO_16_EXTENT, name)) {
 		dev_err(dev, "Unable to lock port addresses (0x%X-0x%X)\n",
@@ -224,54 +103,23 @@ static int idio_16_probe(struct device *dev, unsigned int id)
 		return -EBUSY;
 	}
 
-	idio16gpio->reg = devm_ioport_map(dev, base[id], IDIO_16_EXTENT);
-	if (!idio16gpio->reg)
+	regs = devm_ioport_map(dev, base[id], IDIO_16_EXTENT);
+	if (!regs)
 		return -ENOMEM;
 
-	idio16gpio->chip.label = name;
-	idio16gpio->chip.parent = dev;
-	idio16gpio->chip.owner = THIS_MODULE;
-	idio16gpio->chip.base = -1;
-	idio16gpio->chip.ngpio = IDIO_16_NGPIO;
-	idio16gpio->chip.names = idio_16_names;
-	idio16gpio->chip.get_direction = idio_16_gpio_get_direction;
-	idio16gpio->chip.direction_input = idio_16_gpio_direction_input;
-	idio16gpio->chip.direction_output = idio_16_gpio_direction_output;
-	idio16gpio->chip.get = idio_16_gpio_get;
-	idio16gpio->chip.get_multiple = idio_16_gpio_get_multiple;
-	idio16gpio->chip.set = idio_16_gpio_set;
-	idio16gpio->chip.set_multiple = idio_16_gpio_set_multiple;
-
-	idio_16_state_init(&idio16gpio->state);
-	/* FET off states are represented by bit values of "1" */
-	bitmap_fill(idio16gpio->state.out_state, IDIO_16_NOUT);
+	map = devm_regmap_init_mmio(dev, regs, &idio_16_regmap_config);
+	if (IS_ERR(map))
+		return dev_err_probe(dev, PTR_ERR(map),
+				     "Unable to initialize register map\n");
 
-	girq = &idio16gpio->chip.irq;
-	gpio_irq_chip_set_chip(girq, &idio_16_irqchip);
-	/* This will let us handle the parent IRQ in the driver */
-	girq->parent_handler = NULL;
-	girq->num_parents = 0;
-	girq->parents = NULL;
-	girq->default_type = IRQ_TYPE_NONE;
-	girq->handler = handle_edge_irq;
-	girq->init_hw = idio_16_irq_init_hw;
-
-	raw_spin_lock_init(&idio16gpio->lock);
-
-	err = devm_gpiochip_add_data(dev, &idio16gpio->chip, idio16gpio);
-	if (err) {
-		dev_err(dev, "GPIO registering failed (%d)\n", err);
-		return err;
-	}
-
-	err = devm_request_irq(dev, irq[id], idio_16_irq_handler, 0, name,
-		idio16gpio);
-	if (err) {
-		dev_err(dev, "IRQ handler registering failed (%d)\n", err);
-		return err;
-	}
+	config.parent = dev;
+	config.map = map;
+	config.regmap_irqs = idio_16_regmap_irqs;
+	config.num_regmap_irqs = ARRAY_SIZE(idio_16_regmap_irqs);
+	config.irq = irq[id];
+	config.no_status = true;
 
-	return 0;
+	return devm_idio_16_regmap_register(dev, &config);
 }
 
 static struct isa_driver idio_16_driver = {
-- 
2.39.2

[PATCH v2 5/6] gpio: pci-idio-16: Migrate to the regmap API

[William Breathitt Gray]

The regmap API supports IO port accessors so we can take advantage of
regmap abstractions rather than handling access to the device registers
directly in the driver. Migrate the pci-idio-16 module to the new
idio-16 library interface leveraging the gpio-regmap API.

Suggested-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: William Breathitt Gray <william.gray@linaro.org>
---
Changes in v2:
 - Set io_port to true in idio_16_regmap_config

 drivers/gpio/Kconfig            |   2 +-
 drivers/gpio/gpio-pci-idio-16.c | 296 ++++++++------------------------
 2 files changed, 70 insertions(+), 228 deletions(-)

diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 8eb1f21c019e..e57744df2160 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -1571,7 +1571,7 @@ config GPIO_PCH
 
 config GPIO_PCI_IDIO_16
 	tristate "ACCES PCI-IDIO-16 GPIO support"
-	select GPIOLIB_IRQCHIP
+	select REGMAP_MMIO
 	select GPIO_IDIO_16
 	help
 	  Enables GPIO support for the ACCES PCI-IDIO-16. An interrupt is
diff --git a/drivers/gpio/gpio-pci-idio-16.c b/drivers/gpio/gpio-pci-idio-16.c
index a86ce748384b..5b024157a10f 100644
--- a/drivers/gpio/gpio-pci-idio-16.c
+++ b/drivers/gpio/gpio-pci-idio-16.c
@@ -5,208 +5,82 @@
  */
 #include <linux/bits.h>
 #include <linux/device.h>
-#include <linux/errno.h>
-#include <linux/gpio/driver.h>
-#include <linux/interrupt.h>
-#include <linux/irqdesc.h>
+#include <linux/err.h>
+#include <linux/irq.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/pci.h>
-#include <linux/spinlock.h>
+#include <linux/regmap.h>
 #include <linux/types.h>
 
 #include "gpio-idio-16.h"
 
-/**
- * struct idio_16_gpio - GPIO device private data structure
- * @chip:	instance of the gpio_chip
- * @lock:	synchronization lock to prevent I/O race conditions
- * @reg:	I/O address offset for the GPIO device registers
- * @state:	ACCES IDIO-16 device state
- * @irq_mask:	I/O bits affected by interrupts
- */
-struct idio_16_gpio {
-	struct gpio_chip chip;
-	raw_spinlock_t lock;
-	struct idio_16 __iomem *reg;
-	struct idio_16_state state;
-	unsigned long irq_mask;
+static const struct regmap_range idio_16_wr_ranges[] = {
+	regmap_reg_range(0x0, 0x2), regmap_reg_range(0x3, 0x4),
 };
-
-static int idio_16_gpio_get_direction(struct gpio_chip *chip,
-	unsigned int offset)
-{
-	if (idio_16_get_direction(offset))
-		return GPIO_LINE_DIRECTION_IN;
-
-	return GPIO_LINE_DIRECTION_OUT;
-}
-
-static int idio_16_gpio_direction_input(struct gpio_chip *chip,
-	unsigned int offset)
-{
-	return 0;
-}
-
-static int idio_16_gpio_direction_output(struct gpio_chip *chip,
-	unsigned int offset, int value)
-{
-	chip->set(chip, offset, value);
-	return 0;
-}
-
-static int idio_16_gpio_get(struct gpio_chip *chip, unsigned int offset)
-{
-	struct idio_16_gpio *const idio16gpio = gpiochip_get_data(chip);
-
-	return idio_16_get(idio16gpio->reg, &idio16gpio->state, offset);
-}
-
-static int idio_16_gpio_get_multiple(struct gpio_chip *chip,
-	unsigned long *mask, unsigned long *bits)
-{
-	struct idio_16_gpio *const idio16gpio = gpiochip_get_data(chip);
-
-	idio_16_get_multiple(idio16gpio->reg, &idio16gpio->state, mask, bits);
-	return 0;
-}
-
-static void idio_16_gpio_set(struct gpio_chip *chip, unsigned int offset,
-	int value)
-{
-	struct idio_16_gpio *const idio16gpio = gpiochip_get_data(chip);
-
-	idio_16_set(idio16gpio->reg, &idio16gpio->state, offset, value);
-}
-
-static void idio_16_gpio_set_multiple(struct gpio_chip *chip,
-	unsigned long *mask, unsigned long *bits)
-{
-	struct idio_16_gpio *const idio16gpio = gpiochip_get_data(chip);
-
-	idio_16_set_multiple(idio16gpio->reg, &idio16gpio->state, mask, bits);
-}
-
-static void idio_16_irq_ack(struct irq_data *data)
-{
-}
-
-static void idio_16_irq_mask(struct irq_data *data)
-{
-	struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
-	struct idio_16_gpio *const idio16gpio = gpiochip_get_data(chip);
-	const unsigned long mask = BIT(irqd_to_hwirq(data));
-	unsigned long flags;
-
-	idio16gpio->irq_mask &= ~mask;
-
-	if (!idio16gpio->irq_mask) {
-		raw_spin_lock_irqsave(&idio16gpio->lock, flags);
-
-		iowrite8(0, &idio16gpio->reg->irq_ctl);
-
-		raw_spin_unlock_irqrestore(&idio16gpio->lock, flags);
-	}
-}
-
-static void idio_16_irq_unmask(struct irq_data *data)
-{
-	struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
-	struct idio_16_gpio *const idio16gpio = gpiochip_get_data(chip);
-	const unsigned long mask = BIT(irqd_to_hwirq(data));
-	const unsigned long prev_irq_mask = idio16gpio->irq_mask;
-	unsigned long flags;
-
-	idio16gpio->irq_mask |= mask;
-
-	if (!prev_irq_mask) {
-		raw_spin_lock_irqsave(&idio16gpio->lock, flags);
-
-		ioread8(&idio16gpio->reg->irq_ctl);
-
-		raw_spin_unlock_irqrestore(&idio16gpio->lock, flags);
-	}
-}
-
-static int idio_16_irq_set_type(struct irq_data *data, unsigned int flow_type)
-{
-	/* The only valid irq types are none and both-edges */
-	if (flow_type != IRQ_TYPE_NONE &&
-		(flow_type & IRQ_TYPE_EDGE_BOTH) != IRQ_TYPE_EDGE_BOTH)
-		return -EINVAL;
-
-	return 0;
-}
-
-static struct irq_chip idio_16_irqchip = {
-	.name = "pci-idio-16",
-	.irq_ack = idio_16_irq_ack,
-	.irq_mask = idio_16_irq_mask,
-	.irq_unmask = idio_16_irq_unmask,
-	.irq_set_type = idio_16_irq_set_type
+static const struct regmap_range idio_16_rd_ranges[] = {
+	regmap_reg_range(0x1, 0x2), regmap_reg_range(0x5, 0x6),
 };
-
-static irqreturn_t idio_16_irq_handler(int irq, void *dev_id)
-{
-	struct idio_16_gpio *const idio16gpio = dev_id;
-	unsigned int irq_status;
-	struct gpio_chip *const chip = &idio16gpio->chip;
-	int gpio;
-
-	raw_spin_lock(&idio16gpio->lock);
-
-	irq_status = ioread8(&idio16gpio->reg->irq_status);
-
-	raw_spin_unlock(&idio16gpio->lock);
-
-	/* Make sure our device generated IRQ */
-	if (!(irq_status & 0x3) || !(irq_status & 0x4))
-		return IRQ_NONE;
-
-	for_each_set_bit(gpio, &idio16gpio->irq_mask, chip->ngpio)
-		generic_handle_domain_irq(chip->irq.domain, gpio);
-
-	raw_spin_lock(&idio16gpio->lock);
-
-	/* Clear interrupt */
-	iowrite8(0, &idio16gpio->reg->in0_7);
-
-	raw_spin_unlock(&idio16gpio->lock);
-
-	return IRQ_HANDLED;
-}
-
-#define IDIO_16_NGPIO 32
-static const char *idio_16_names[IDIO_16_NGPIO] = {
-	"OUT0", "OUT1", "OUT2", "OUT3", "OUT4", "OUT5", "OUT6", "OUT7",
-	"OUT8", "OUT9", "OUT10", "OUT11", "OUT12", "OUT13", "OUT14", "OUT15",
-	"IIN0", "IIN1", "IIN2", "IIN3", "IIN4", "IIN5", "IIN6", "IIN7",
-	"IIN8", "IIN9", "IIN10", "IIN11", "IIN12", "IIN13", "IIN14", "IIN15"
+static const struct regmap_range idio_16_volatile_ranges[] = {
+	regmap_reg_range(0x1, 0x2), regmap_reg_range(0x5, 0x6),
+};
+static const struct regmap_range idio_16_precious_ranges[] = {
+	regmap_reg_range(0x2, 0x2),
+};
+static const struct regmap_access_table idio_16_wr_table = {
+	.yes_ranges = idio_16_wr_ranges,
+	.n_yes_ranges = ARRAY_SIZE(idio_16_wr_ranges),
+};
+static const struct regmap_access_table idio_16_rd_table = {
+	.yes_ranges = idio_16_rd_ranges,
+	.n_yes_ranges = ARRAY_SIZE(idio_16_rd_ranges),
+};
+static const struct regmap_access_table idio_16_volatile_table = {
+	.yes_ranges = idio_16_volatile_ranges,
+	.n_yes_ranges = ARRAY_SIZE(idio_16_volatile_ranges),
+};
+static const struct regmap_access_table idio_16_precious_table = {
+	.yes_ranges = idio_16_precious_ranges,
+	.n_yes_ranges = ARRAY_SIZE(idio_16_precious_ranges),
+};
+static const struct regmap_config idio_16_regmap_config = {
+	.reg_bits = 8,
+	.reg_stride = 1,
+	.val_bits = 8,
+	.io_port = true,
+	.max_register = 0x6,
+	.wr_table = &idio_16_wr_table,
+	.rd_table = &idio_16_rd_table,
+	.volatile_table = &idio_16_volatile_table,
+	.precious_table = &idio_16_precious_table,
+	.cache_type = REGCACHE_FLAT,
 };
 
-static int idio_16_irq_init_hw(struct gpio_chip *gc)
-{
-	struct idio_16_gpio *const idio16gpio = gpiochip_get_data(gc);
-
-	/* Disable IRQ by default and clear any pending interrupt */
-	iowrite8(0, &idio16gpio->reg->irq_ctl);
-	iowrite8(0, &idio16gpio->reg->in0_7);
+/* Only input lines (GPIO 16-31) support interrupts */
+#define IDIO_16_REGMAP_IRQ(_id)						\
+	[16 + _id] = {							\
+		.mask = BIT(2),						\
+		.type = { .types_supported = IRQ_TYPE_EDGE_BOTH },	\
+	}
 
-	return 0;
-}
+static const struct regmap_irq idio_16_regmap_irqs[] = {
+	IDIO_16_REGMAP_IRQ(0), IDIO_16_REGMAP_IRQ(1), IDIO_16_REGMAP_IRQ(2), /* 0-2 */
+	IDIO_16_REGMAP_IRQ(3), IDIO_16_REGMAP_IRQ(4), IDIO_16_REGMAP_IRQ(5), /* 3-5 */
+	IDIO_16_REGMAP_IRQ(6), IDIO_16_REGMAP_IRQ(7), IDIO_16_REGMAP_IRQ(8), /* 6-8 */
+	IDIO_16_REGMAP_IRQ(9), IDIO_16_REGMAP_IRQ(10), IDIO_16_REGMAP_IRQ(11), /* 9-11 */
+	IDIO_16_REGMAP_IRQ(12), IDIO_16_REGMAP_IRQ(13), IDIO_16_REGMAP_IRQ(14), /* 12-14 */
+	IDIO_16_REGMAP_IRQ(15), /* 15 */
+};
 
 static int idio_16_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 {
 	struct device *const dev = &pdev->dev;
-	struct idio_16_gpio *idio16gpio;
 	int err;
 	const size_t pci_bar_index = 2;
 	const char *const name = pci_name(pdev);
-	struct gpio_irq_chip *girq;
-
-	idio16gpio = devm_kzalloc(dev, sizeof(*idio16gpio), GFP_KERNEL);
-	if (!idio16gpio)
-		return -ENOMEM;
+	struct idio_16_regmap_config config = {};
+	void __iomem *regs;
+	struct regmap *map;
 
 	err = pcim_enable_device(pdev);
 	if (err) {
@@ -220,53 +94,21 @@ static int idio_16_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 		return err;
 	}
 
-	idio16gpio->reg = pcim_iomap_table(pdev)[pci_bar_index];
+	regs = pcim_iomap_table(pdev)[pci_bar_index];
 
-	/* Deactivate input filters */
-	iowrite8(0, &idio16gpio->reg->filter_ctl);
+	map = devm_regmap_init_mmio(dev, regs, &idio_16_regmap_config);
+	if (IS_ERR(map))
+		return dev_err_probe(dev, PTR_ERR(map),
+				     "Unable to initialize register map\n");
 
-	idio16gpio->chip.label = name;
-	idio16gpio->chip.parent = dev;
-	idio16gpio->chip.owner = THIS_MODULE;
-	idio16gpio->chip.base = -1;
-	idio16gpio->chip.ngpio = IDIO_16_NGPIO;
-	idio16gpio->chip.names = idio_16_names;
-	idio16gpio->chip.get_direction = idio_16_gpio_get_direction;
-	idio16gpio->chip.direction_input = idio_16_gpio_direction_input;
-	idio16gpio->chip.direction_output = idio_16_gpio_direction_output;
-	idio16gpio->chip.get = idio_16_gpio_get;
-	idio16gpio->chip.get_multiple = idio_16_gpio_get_multiple;
-	idio16gpio->chip.set = idio_16_gpio_set;
-	idio16gpio->chip.set_multiple = idio_16_gpio_set_multiple;
-
-	idio_16_state_init(&idio16gpio->state);
-
-	girq = &idio16gpio->chip.irq;
-	girq->chip = &idio_16_irqchip;
-	/* This will let us handle the parent IRQ in the driver */
-	girq->parent_handler = NULL;
-	girq->num_parents = 0;
-	girq->parents = NULL;
-	girq->default_type = IRQ_TYPE_NONE;
-	girq->handler = handle_edge_irq;
-	girq->init_hw = idio_16_irq_init_hw;
-
-	raw_spin_lock_init(&idio16gpio->lock);
-
-	err = devm_gpiochip_add_data(dev, &idio16gpio->chip, idio16gpio);
-	if (err) {
-		dev_err(dev, "GPIO registering failed (%d)\n", err);
-		return err;
-	}
-
-	err = devm_request_irq(dev, pdev->irq, idio_16_irq_handler, IRQF_SHARED,
-		name, idio16gpio);
-	if (err) {
-		dev_err(dev, "IRQ handler registering failed (%d)\n", err);
-		return err;
-	}
+	config.parent = dev;
+	config.map = map;
+	config.regmap_irqs = idio_16_regmap_irqs;
+	config.num_regmap_irqs = ARRAY_SIZE(idio_16_regmap_irqs);
+	config.irq = pdev->irq;
+	config.filters = true;
 
-	return 0;
+	return devm_idio_16_regmap_register(dev, &config);
 }
 
 static const struct pci_device_id idio_16_pci_dev_id[] = {
-- 
2.39.2

[PATCH v2 6/6] gpio: idio-16: Remove unused legacy interface

[William Breathitt Gray]

All idio-16 library consumers have migrated to the new interface
leveraging the gpio-regmap API. Legacy interface functions and code are
removed as no longer needed.

Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: William Breathitt Gray <william.gray@linaro.org>
---
 drivers/gpio/gpio-idio-16.c | 131 +-----------------------------------
 drivers/gpio/gpio-idio-16.h |  66 ------------------
 2 files changed, 1 insertion(+), 196 deletions(-)

diff --git a/drivers/gpio/gpio-idio-16.c b/drivers/gpio/gpio-idio-16.c
index 13e35d1ef658..26a39aa38426 100644
--- a/drivers/gpio/gpio-idio-16.c
+++ b/drivers/gpio/gpio-idio-16.c
@@ -3,15 +3,13 @@
  * GPIO library for the ACCES IDIO-16 family
  * Copyright (C) 2022 William Breathitt Gray
  */
-#include <linux/bitmap.h>
+#include <linux/bits.h>
 #include <linux/device.h>
 #include <linux/err.h>
 #include <linux/export.h>
 #include <linux/gpio/regmap.h>
-#include <linux/io.h>
 #include <linux/module.h>
 #include <linux/regmap.h>
-#include <linux/spinlock.h>
 #include <linux/types.h>
 
 #include "gpio-idio-16.h"
@@ -172,133 +170,6 @@ int devm_idio_16_regmap_register(struct device *const dev,
 }
 EXPORT_SYMBOL_GPL(devm_idio_16_regmap_register);
 
-/**
- * idio_16_get - get signal value at signal offset
- * @reg:	ACCES IDIO-16 device registers
- * @state:	ACCES IDIO-16 device state
- * @offset:	offset of signal to get
- *
- * Returns the signal value (0=low, 1=high) for the signal at @offset.
- */
-int idio_16_get(struct idio_16 __iomem *const reg,
-		struct idio_16_state *const state, const unsigned long offset)
-{
-	const unsigned long mask = BIT(offset);
-
-	if (offset < IDIO_16_NOUT)
-		return test_bit(offset, state->out_state);
-
-	if (offset < 24)
-		return !!(ioread8(&reg->in0_7) & (mask >> IDIO_16_NOUT));
-
-	if (offset < 32)
-		return !!(ioread8(&reg->in8_15) & (mask >> 24));
-
-	return -EINVAL;
-}
-EXPORT_SYMBOL_GPL(idio_16_get);
-
-/**
- * idio_16_get_multiple - get multiple signal values at multiple signal offsets
- * @reg:	ACCES IDIO-16 device registers
- * @state:	ACCES IDIO-16 device state
- * @mask:	mask of signals to get
- * @bits:	bitmap to store signal values
- *
- * Stores in @bits the values (0=low, 1=high) for the signals defined by @mask.
- */
-void idio_16_get_multiple(struct idio_16 __iomem *const reg,
-			  struct idio_16_state *const state,
-			  const unsigned long *const mask,
-			  unsigned long *const bits)
-{
-	unsigned long flags;
-	const unsigned long out_mask = GENMASK(IDIO_16_NOUT - 1, 0);
-
-	spin_lock_irqsave(&state->lock, flags);
-
-	bitmap_replace(bits, bits, state->out_state, &out_mask, IDIO_16_NOUT);
-	if (*mask & GENMASK(23, 16))
-		bitmap_set_value8(bits, ioread8(&reg->in0_7), 16);
-	if (*mask & GENMASK(31, 24))
-		bitmap_set_value8(bits, ioread8(&reg->in8_15), 24);
-
-	spin_unlock_irqrestore(&state->lock, flags);
-}
-EXPORT_SYMBOL_GPL(idio_16_get_multiple);
-
-/**
- * idio_16_set - set signal value at signal offset
- * @reg:	ACCES IDIO-16 device registers
- * @state:	ACCES IDIO-16 device state
- * @offset:	offset of signal to set
- * @value:	value of signal to set
- *
- * Assigns output @value for the signal at @offset.
- */
-void idio_16_set(struct idio_16 __iomem *const reg,
-		 struct idio_16_state *const state, const unsigned long offset,
-		 const unsigned long value)
-{
-	unsigned long flags;
-
-	if (offset >= IDIO_16_NOUT)
-		return;
-
-	spin_lock_irqsave(&state->lock, flags);
-
-	__assign_bit(offset, state->out_state, value);
-	if (offset < 8)
-		iowrite8(bitmap_get_value8(state->out_state, 0), &reg->out0_7);
-	else
-		iowrite8(bitmap_get_value8(state->out_state, 8), &reg->out8_15);
-
-	spin_unlock_irqrestore(&state->lock, flags);
-}
-EXPORT_SYMBOL_GPL(idio_16_set);
-
-/**
- * idio_16_set_multiple - set signal values at multiple signal offsets
- * @reg:	ACCES IDIO-16 device registers
- * @state:	ACCES IDIO-16 device state
- * @mask:	mask of signals to set
- * @bits:	bitmap of signal output values
- *
- * Assigns output values defined by @bits for the signals defined by @mask.
- */
-void idio_16_set_multiple(struct idio_16 __iomem *const reg,
-			  struct idio_16_state *const state,
-			  const unsigned long *const mask,
-			  const unsigned long *const bits)
-{
-	unsigned long flags;
-
-	spin_lock_irqsave(&state->lock, flags);
-
-	bitmap_replace(state->out_state, state->out_state, bits, mask,
-		       IDIO_16_NOUT);
-	if (*mask & GENMASK(7, 0))
-		iowrite8(bitmap_get_value8(state->out_state, 0), &reg->out0_7);
-	if (*mask & GENMASK(15, 8))
-		iowrite8(bitmap_get_value8(state->out_state, 8), &reg->out8_15);
-
-	spin_unlock_irqrestore(&state->lock, flags);
-}
-EXPORT_SYMBOL_GPL(idio_16_set_multiple);
-
-/**
- * idio_16_state_init - initialize idio_16_state structure
- * @state:	ACCES IDIO-16 device state
- *
- * Initializes the ACCES IDIO-16 device @state for use in idio-16 library
- * functions.
- */
-void idio_16_state_init(struct idio_16_state *const state)
-{
-	spin_lock_init(&state->lock);
-}
-EXPORT_SYMBOL_GPL(idio_16_state_init);
-
 MODULE_AUTHOR("William Breathitt Gray");
 MODULE_DESCRIPTION("ACCES IDIO-16 GPIO Library");
 MODULE_LICENSE("GPL");
diff --git a/drivers/gpio/gpio-idio-16.h b/drivers/gpio/gpio-idio-16.h
index 22bb591b4ec0..7a4694dae8f5 100644
--- a/drivers/gpio/gpio-idio-16.h
+++ b/drivers/gpio/gpio-idio-16.h
@@ -3,9 +3,6 @@
 #ifndef _IDIO_16_H_
 #define _IDIO_16_H_
 
-#include <linux/spinlock.h>
-#include <linux/types.h>
-
 struct device;
 struct regmap;
 struct regmap_irq;
@@ -30,69 +27,6 @@ struct idio_16_regmap_config {
 	bool filters;
 };
 
-/**
- * struct idio_16 - IDIO-16 registers structure
- * @out0_7:	Read: FET Drive Outputs 0-7
- *		Write: FET Drive Outputs 0-7
- * @in0_7:	Read: Isolated Inputs 0-7
- *		Write: Clear Interrupt
- * @irq_ctl:	Read: Enable IRQ
- *		Write: Disable IRQ
- * @filter_ctl:	Read: Activate Input Filters 0-15
- *		Write: Deactivate Input Filters 0-15
- * @out8_15:	Read: FET Drive Outputs 8-15
- *		Write: FET Drive Outputs 8-15
- * @in8_15:	Read: Isolated Inputs 8-15
- *		Write: Unused
- * @irq_status:	Read: Interrupt status
- *		Write: Unused
- */
-struct idio_16 {
-	u8 out0_7;
-	u8 in0_7;
-	u8 irq_ctl;
-	u8 filter_ctl;
-	u8 out8_15;
-	u8 in8_15;
-	u8 irq_status;
-};
-
-#define IDIO_16_NOUT 16
-
-/**
- * struct idio_16_state - IDIO-16 state structure
- * @lock:	synchronization lock for accessing device state
- * @out_state:	output signals state
- * @irq_mask:	IRQ mask state
- */
-struct idio_16_state {
-	spinlock_t lock;
-	DECLARE_BITMAP(out_state, IDIO_16_NOUT);
-};
-
-/**
- * idio_16_get_direction - get the I/O direction for a signal offset
- * @offset:	offset of signal to get direction
- *
- * Returns the signal direction (0=output, 1=input) for the signal at @offset.
- */
-static inline int idio_16_get_direction(const unsigned long offset)
-{
-	return (offset >= IDIO_16_NOUT) ? 1 : 0;
-}
-
-int idio_16_get(struct idio_16 __iomem *reg, struct idio_16_state *state,
-		unsigned long offset);
-void idio_16_get_multiple(struct idio_16 __iomem *reg,
-			  struct idio_16_state *state,
-			  const unsigned long *mask, unsigned long *bits);
-void idio_16_set(struct idio_16 __iomem *reg, struct idio_16_state *state,
-		 unsigned long offset, unsigned long value);
-void idio_16_set_multiple(struct idio_16 __iomem *reg,
-			  struct idio_16_state *state,
-			  const unsigned long *mask, const unsigned long *bits);
-void idio_16_state_init(struct idio_16_state *state);
-
 int devm_idio_16_regmap_register(struct device *dev,
 				 const struct idio_16_regmap_config *config);
 
-- 
2.39.2

Re: [PATCH v2 1/6] regmap-irq: Add no_status support

[Bartosz Golaszewski]

On Mon, Feb 27, 2023 at 5:54 PM William Breathitt Gray
<william.gray@linaro.org> wrote:
>
> Some devices lack status registers, yet expect to handle interrupts.
> Introduce a no_status flag to indicate such a configuration, where
> rather than read a status register to verify, all interrupts received
> are assumed to be active.
>
> Cc: Mark Brown <broonie@kernel.org>
> Signed-off-by: William Breathitt Gray <william.gray@linaro.org>
> ---
> Changes in v2:
>  - Utilize memset32() to set status_buf for no_status case
>  - Utilize GENMASK() to generate status_buf mask
>  - Move no_status kernel doc line under runtime_pm line
>
>  drivers/base/regmap/regmap-irq.c | 22 +++++++++++++++-------
>  include/linux/regmap.h           |  2 ++
>  2 files changed, 17 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/base/regmap/regmap-irq.c b/drivers/base/regmap/regmap-irq.c
> index a8f185430a07..290e26664a21 100644
> --- a/drivers/base/regmap/regmap-irq.c
> +++ b/drivers/base/regmap/regmap-irq.c
> @@ -437,7 +437,10 @@ static irqreturn_t regmap_irq_thread(int irq, void *d)
>          * possible in order to reduce the I/O overheads.
>          */
>
> -       if (chip->num_main_regs) {
> +       if (chip->no_status) {
> +               /* no status register so default to all active */
> +               memset32(data->status_buf, GENMASK(31, 0), chip->num_regs);
> +       } else if (chip->num_main_regs) {
>                 unsigned int max_main_bits;
>                 unsigned long size;
>
> @@ -967,12 +970,17 @@ int regmap_add_irq_chip_fwnode(struct fwnode_handle *fwnode,
>                         continue;
>
>                 /* Ack masked but set interrupts */
> -               reg = d->get_irq_reg(d, d->chip->status_base, i);
> -               ret = regmap_read(map, reg, &d->status_buf[i]);
> -               if (ret != 0) {
> -                       dev_err(map->dev, "Failed to read IRQ status: %d\n",
> -                               ret);
> -                       goto err_alloc;
> +               if (d->chip->no_status) {
> +                       /* no status register so default to all active */
> +                       d->status_buf[i] = GENMASK(31, 0);
> +               } else {
> +                       reg = d->get_irq_reg(d, d->chip->status_base, i);
> +                       ret = regmap_read(map, reg, &d->status_buf[i]);
> +                       if (ret != 0) {
> +                               dev_err(map->dev, "Failed to read IRQ status: %d\n",
> +                                       ret);
> +                               goto err_alloc;
> +                       }
>                 }
>
>                 if (chip->status_invert)
> diff --git a/include/linux/regmap.h b/include/linux/regmap.h
> index a3bc695bcca0..c6d80d4e73de 100644
> --- a/include/linux/regmap.h
> +++ b/include/linux/regmap.h
> @@ -1564,6 +1564,7 @@ struct regmap_irq_chip_data;
>   *                   the need for a @sub_reg_offsets table.
>   * @status_invert: Inverted status register: cleared bits are active interrupts.
>   * @runtime_pm:  Hold a runtime PM lock on the device when accessing it.
> + * @no_status: No status register: all interrupts assumed generated by device.
>   *
>   * @num_regs:    Number of registers in each control bank.
>   * @irqs:        Descriptors for individual IRQs.  Interrupt numbers are
> @@ -1630,6 +1631,7 @@ struct regmap_irq_chip {
>         unsigned int clear_on_unmask:1;
>         unsigned int not_fixed_stride:1;
>         unsigned int status_invert:1;
> +       unsigned int no_status:1;
>
>         int num_regs;
>
> --
> 2.39.2
>

Mark,

If this looks good to you, could you Ack it so that I can take it
through the GPIO tree?

Bart

Re: (subset) [PATCH v2 0/6] Migrate IDIO-16 GPIO drivers to regmap API

[Mark Brown]

On Mon, 27 Feb 2023 11:45:21 -0500, William Breathitt Gray wrote:
> Changes in v2:
>  - Utilize memset32() to set status_buf for no_status case
>  - Utilize GENMASK() to generate status_buf mask
>  - Move no_status kernel doc line under runtime_pm line
>  - Add comma to end of idio_16_names initialization list
>  - Set io_port to true in idio_16_regmap_config
> 
> [...]

Applied to

   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/regmap.git for-next

Thanks!

[1/6] regmap-irq: Add no_status support
      commit: 4d60cac951fd2dfbf261b83abb805748abc8b995

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark

Re: [PATCH v2 0/6] Migrate IDIO-16 GPIO drivers to regmap API

[Linus Walleij]

On Mon, Feb 27, 2023 at 5:54 PM William Breathitt Gray
<william.gray@linaro.org> wrote:

This looks good to me.
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>

Bartosz, of you merge this you can drop the corresponding
patches to immutable irqchip conversion for these chips
that I will be posting shortly (currently on the build servers).

Yours,
Linus Walleij

Re: [PATCH v2 1/6] regmap-irq: Add no_status support

[William Breathitt Gray]

[-- Attachment #1: Type: text/plain, Size: 1112 bytes --]

On Mon, Mar 06, 2023 at 11:11:26AM +0100, Bartosz Golaszewski wrote:
> On Mon, Feb 27, 2023 at 5:54 PM William Breathitt Gray
> <william.gray@linaro.org> wrote:
> >
> > Some devices lack status registers, yet expect to handle interrupts.
> > Introduce a no_status flag to indicate such a configuration, where
> > rather than read a status register to verify, all interrupts received
> > are assumed to be active.
> >
> > Cc: Mark Brown <broonie@kernel.org>
> > Signed-off-by: William Breathitt Gray <william.gray@linaro.org>

[...]

> Mark,
> 
> If this looks good to you, could you Ack it so that I can take it
> through the GPIO tree?
> 
> Bart

Bart,

There's a change to the regmap-irq handle_mask_sync() callback I
submitted that will affect these patches [0]. If you haven't already
picked up this series, I suggest waiting until the handle_mask_sync()
change is resolved, after which I can rebase this series on top of it
and we'll end up with a cleaner git history.

[0] https://lore.kernel.org/all/20230309232009.2938-1-william.gray@linaro.org/

William Breathitt Gray

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Re: [PATCH v2 0/6] Migrate IDIO-16 GPIO drivers to regmap API

[Bartosz Golaszewski]

On Mon, Mar 6, 2023 at 3:13 PM Linus Walleij <linus.walleij@linaro.org> wrote:
>
> On Mon, Feb 27, 2023 at 5:54 PM William Breathitt Gray
> <william.gray@linaro.org> wrote:
>
> This looks good to me.
> Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
>
> Bartosz, of you merge this you can drop the corresponding
> patches to immutable irqchip conversion for these chips
> that I will be posting shortly (currently on the build servers).
>
> Yours,
> Linus Walleij

Mark, can you provide me with an immutable tag for the regmap tree
containing commit 1/6 from this series, please?

Bartosz

Re: [PATCH v2 0/6] Migrate IDIO-16 GPIO drivers to regmap API

[Linus Walleij]

On Wed, Mar 15, 2023 at 11:02 AM Bartosz Golaszewski <brgl@bgdev.pl> wrote:
> On Mon, Mar 6, 2023 at 3:13 PM Linus Walleij <linus.walleij@linaro.org> wrote:
> >
> > On Mon, Feb 27, 2023 at 5:54 PM William Breathitt Gray
> > <william.gray@linaro.org> wrote:
> >
> > This looks good to me.
> > Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
> >
> > Bartosz, of you merge this you can drop the corresponding
> > patches to immutable irqchip conversion for these chips
> > that I will be posting shortly (currently on the build servers).
> >
> > Yours,
> > Linus Walleij
>
> Mark, can you provide me with an immutable tag for the regmap tree
> containing commit 1/6 from this series, please?

I think there will be a conflict with the immutable irq_chip patches
that are merged, but maybe the conflict isn't that bad so you can
resolve it while applying.

Yours,
Linus Walleij

Re: [PATCH v2 1/6] regmap-irq: Add no_status support

[Mark Brown]

[-- Attachment #1: Type: text/plain, Size: 1271 bytes --]

On Mon, Feb 27, 2023 at 11:45:22AM -0500, William Breathitt Gray wrote:
> Some devices lack status registers, yet expect to handle interrupts.
> Introduce a no_status flag to indicate such a configuration, where
> rather than read a status register to verify, all interrupts received
> are assumed to be active.

The following changes since commit fe15c26ee26efa11741a7b632e9f23b01aca4cc6:

  Linux 6.3-rc1 (2023-03-05 14:52:03 -0800)

are available in the Git repository at:

  https://git.kernel.org/pub/scm/linux/kernel/git/broonie/regmap.git tags/regmap-no-status

for you to fetch changes up to 4d60cac951fd2dfbf261b83abb805748abc8b995:

  regmap-irq: Add no_status support (2023-03-05 23:38:50 +0000)

----------------------------------------------------------------
regmap: Add no_status support

This patch adds support for devices which don't support readback of
individual interrupt statuses, we report all interrupts as firing and
hope the consumers do the right thing.

----------------------------------------------------------------
William Breathitt Gray (1):
      regmap-irq: Add no_status support

 drivers/base/regmap/regmap-irq.c | 22 +++++++++++++++-------
 include/linux/regmap.h           |  2 ++
 2 files changed, 17 insertions(+), 7 deletions(-)

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Re: [PATCH v2 5/6] gpio: pci-idio-16: Migrate to the regmap API

[Bartosz Golaszewski]

On Mon, Feb 27, 2023 at 5:54 PM William Breathitt Gray
<william.gray@linaro.org> wrote:
>
> The regmap API supports IO port accessors so we can take advantage of
> regmap abstractions rather than handling access to the device registers
> directly in the driver. Migrate the pci-idio-16 module to the new
> idio-16 library interface leveraging the gpio-regmap API.
>
> Suggested-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
> Signed-off-by: William Breathitt Gray <william.gray@linaro.org>
> ---

This doesn't apply as Linus predicted with Linus' series in my for-next tree.

Can you rebase and resend?

Bart