Merge branch 'linusw/devel' of...

Merge branch 'linusw/devel' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio.git into gpio/next

Device driver features, cleanups and bug fixes.
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>

arch/arm/mach-pxa/tosa.c

@@ -927,8 +927,6 @@ static void tosa_restart(char mode, const char *cmd)
 
 static void __init tosa_init(void)
 {
-	int dummy;
-
 	pxa2xx_mfp_config(ARRAY_AND_SIZE(tosa_pin_config));
 
 	pxa_set_ffuart_info(NULL);
@@ -947,10 +945,6 @@ static void __init tosa_init(void)
 	/* enable batt_fault */
 	PMCR = 0x01;
 
-	dummy = gpiochip_reserve(TOSA_SCOOP_GPIO_BASE, 12);
-	dummy = gpiochip_reserve(TOSA_SCOOP_JC_GPIO_BASE, 12);
-	dummy = gpiochip_reserve(TOSA_TC6393XB_GPIO_BASE, 16);
-
 	pxa_set_mci_info(&tosa_mci_platform_data);
 	pxa_set_ficp_info(&tosa_ficp_platform_data);
 	pxa_set_i2c_info(NULL);

drivers/gpio/Kconfig

@@ -30,6 +30,9 @@ config ARCH_REQUIRE_GPIOLIB
 	  Selecting this from the architecture code will cause the gpiolib
 	  code to always get built in.
 
+config GPIO_DEVRES
+	def_bool y
+	depends on HAS_IOMEM
 
 
 menuconfig GPIOLIB

drivers/gpio/Makefile

@@ -2,7 +2,8 @@
 
 ccflags-$(CONFIG_DEBUG_GPIO)	+= -DDEBUG
 
-obj-$(CONFIG_GPIOLIB)		+= gpiolib.o devres.o
+obj-$(CONFIG_GPIO_DEVRES)	+= devres.o
+obj-$(CONFIG_GPIOLIB)		+= gpiolib.o
 obj-$(CONFIG_OF_GPIO)		+= gpiolib-of.o
 obj-$(CONFIG_GPIO_ACPI)		+= gpiolib-acpi.o
 

drivers/gpio/gpio-mpc8xxx.c

@@ -292,7 +292,6 @@ static int mpc8xxx_gpio_irq_map(struct irq_domain *h, unsigned int virq,
 
 	irq_set_chip_data(virq, h->host_data);
 	irq_set_chip_and_handler(virq, &mpc8xxx_irq_chip, handle_level_irq);
-	irq_set_irq_type(virq, IRQ_TYPE_NONE);
 
 	return 0;
 }

drivers/gpio/gpio-mxs.c

@@ -65,6 +65,7 @@ struct mxs_gpio_port {
 	struct irq_domain *domain;
 	struct bgpio_chip bgc;
 	enum mxs_gpio_id devid;
+	u32 both_edges;
 };
 
 static inline int is_imx23_gpio(struct mxs_gpio_port *port)
@@ -81,13 +82,23 @@ static inline int is_imx28_gpio(struct mxs_gpio_port *port)
 
 static int mxs_gpio_set_irq_type(struct irq_data *d, unsigned int type)
 {
+	u32 val;
 	u32 pin_mask = 1 << d->hwirq;
 	struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
 	struct mxs_gpio_port *port = gc->private;
 	void __iomem *pin_addr;
 	int edge;
 
+	port->both_edges &= ~pin_mask;
 	switch (type) {
+	case IRQ_TYPE_EDGE_BOTH:
+		val = gpio_get_value(port->bgc.gc.base + d->hwirq);
+		if (val)
+			edge = GPIO_INT_FALL_EDGE;
+		else
+			edge = GPIO_INT_RISE_EDGE;
+		port->both_edges |= pin_mask;
+		break;
 	case IRQ_TYPE_EDGE_RISING:
 		edge = GPIO_INT_RISE_EDGE;
 		break;
@@ -124,6 +135,23 @@ static int mxs_gpio_set_irq_type(struct irq_data *d, unsigned int type)
 	return 0;
 }
 
+static void mxs_flip_edge(struct mxs_gpio_port *port, u32 gpio)
+{
+	u32 bit, val, edge;
+	void __iomem *pin_addr;
+
+	bit = 1 << gpio;
+
+	pin_addr = port->base + PINCTRL_IRQPOL(port);
+	val = readl(pin_addr);
+	edge = val & bit;
+
+	if (edge)
+		writel(bit, pin_addr + MXS_CLR);
+	else
+		writel(bit, pin_addr + MXS_SET);
+}
+
 /* MXS has one interrupt *per* gpio port */
 static void mxs_gpio_irq_handler(u32 irq, struct irq_desc *desc)
 {
@@ -137,6 +165,9 @@ static void mxs_gpio_irq_handler(u32 irq, struct irq_desc *desc)
 
 	while (irq_stat != 0) {
 		int irqoffset = fls(irq_stat) - 1;
+		if (port->both_edges & (1 << irqoffset))
+			mxs_flip_edge(port, irqoffset);
+
 		generic_handle_irq(irq_find_mapping(port->domain, irqoffset));
 		irq_stat &= ~(1 << irqoffset);
 	}

drivers/gpio/gpio-pca953x.c

@@ -46,6 +46,7 @@
 #define PCA957X_TYPE		0x2000
 
 static const struct i2c_device_id pca953x_id[] = {
+	{ "pca9505", 40 | PCA953X_TYPE | PCA_INT, },
 	{ "pca9534", 8  | PCA953X_TYPE | PCA_INT, },
 	{ "pca9535", 16 | PCA953X_TYPE | PCA_INT, },
 	{ "pca9536", 4  | PCA953X_TYPE, },
@@ -71,19 +72,23 @@ static const struct i2c_device_id pca953x_id[] = {
 };
 MODULE_DEVICE_TABLE(i2c, pca953x_id);
 
+#define MAX_BANK 5
+#define BANK_SZ 8
+
+#define NBANK(chip) (chip->gpio_chip.ngpio / BANK_SZ)
+
 struct pca953x_chip {
 	unsigned gpio_start;
-	u32 reg_output;
-	u32 reg_direction;
+	u8 reg_output[MAX_BANK];
+	u8 reg_direction[MAX_BANK];
 	struct mutex i2c_lock;
 
 #ifdef CONFIG_GPIO_PCA953X_IRQ
 	struct mutex irq_lock;
-	u32 irq_mask;
-	u32 irq_stat;
-	u32 irq_trig_raise;
-	u32 irq_trig_fall;
-	int	 irq_base;
+	u8 irq_mask[MAX_BANK];
+	u8 irq_stat[MAX_BANK];
+	u8 irq_trig_raise[MAX_BANK];
+	u8 irq_trig_fall[MAX_BANK];
 	struct irq_domain *domain;
 #endif
 
@@ -93,33 +98,69 @@ struct pca953x_chip {
 	int	chip_type;
 };
 
-static int pca953x_write_reg(struct pca953x_chip *chip, int reg, u32 val)
+static int pca953x_read_single(struct pca953x_chip *chip, int reg, u32 *val,
+				int off)
+{
+	int ret;
+	int bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ);
+	int offset = off / BANK_SZ;
+
+	ret = i2c_smbus_read_byte_data(chip->client,
+				(reg << bank_shift) + offset);
+	*val = ret;
+
+	if (ret < 0) {
+		dev_err(&chip->client->dev, "failed reading register\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+static int pca953x_write_single(struct pca953x_chip *chip, int reg, u32 val,
+				int off)
+{
+	int ret = 0;
+	int bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ);
+	int offset = off / BANK_SZ;
+
+	ret = i2c_smbus_write_byte_data(chip->client,
+					(reg << bank_shift) + offset, val);
+
+	if (ret < 0) {
+		dev_err(&chip->client->dev, "failed writing register\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+static int pca953x_write_regs(struct pca953x_chip *chip, int reg, u8 *val)
 {
 	int ret = 0;
 
 	if (chip->gpio_chip.ngpio <= 8)
-		ret = i2c_smbus_write_byte_data(chip->client, reg, val);
-	else if (chip->gpio_chip.ngpio == 24) {
-		cpu_to_le32s(&val);
+		ret = i2c_smbus_write_byte_data(chip->client, reg, *val);
+	else if (chip->gpio_chip.ngpio >= 24) {
+		int bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ);
 		ret = i2c_smbus_write_i2c_block_data(chip->client,
-						(reg << 2) | REG_ADDR_AI,
-						3,
-						(u8 *) &val);
+					(reg << bank_shift) | REG_ADDR_AI,
+					NBANK(chip), val);
 	}
 	else {
 		switch (chip->chip_type) {
 		case PCA953X_TYPE:
 			ret = i2c_smbus_write_word_data(chip->client,
-							reg << 1, val);
+							reg << 1, (u16) *val);
 			break;
 		case PCA957X_TYPE:
 			ret = i2c_smbus_write_byte_data(chip->client, reg << 1,
-							val & 0xff);
+							val[0]);
 			if (ret < 0)
 				break;
 			ret = i2c_smbus_write_byte_data(chip->client,
 							(reg << 1) + 1,
-							(val & 0xff00) >> 8);
+							val[1]);
 			break;
 		}
 	}
@@ -132,26 +173,24 @@ static int pca953x_write_reg(struct pca953x_chip *chip, int reg, u32 val)
 	return 0;
 }
 
-static int pca953x_read_reg(struct pca953x_chip *chip, int reg, u32 *val)
+static int pca953x_read_regs(struct pca953x_chip *chip, int reg, u8 *val)
 {
 	int ret;
 
 	if (chip->gpio_chip.ngpio <= 8) {
 		ret = i2c_smbus_read_byte_data(chip->client, reg);
 		*val = ret;
-	}
-	else if (chip->gpio_chip.ngpio == 24) {
-		*val = 0;
+	} else if (chip->gpio_chip.ngpio >= 24) {
+		int bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ);
+
 		ret = i2c_smbus_read_i2c_block_data(chip->client,
-						(reg << 2) | REG_ADDR_AI,
-						3,
-						(u8 *) val);
-		le32_to_cpus(val);
+					(reg << bank_shift) | REG_ADDR_AI,
+					NBANK(chip), val);
 	} else {
 		ret = i2c_smbus_read_word_data(chip->client, reg << 1);
-		*val = ret;
+		val[0] = (u16)ret & 0xFF;
+		val[1] = (u16)ret >> 8;
 	}
-
 	if (ret < 0) {
 		dev_err(&chip->client->dev, "failed reading register\n");
 		return ret;
@@ -163,13 +202,13 @@ static int pca953x_read_reg(struct pca953x_chip *chip, int reg, u32 *val)
 static int pca953x_gpio_direction_input(struct gpio_chip *gc, unsigned off)
 {
 	struct pca953x_chip *chip;
-	uint reg_val;
+	u8 reg_val;
 	int ret, offset = 0;
 
 	chip = container_of(gc, struct pca953x_chip, gpio_chip);
 
 	mutex_lock(&chip->i2c_lock);
-	reg_val = chip->reg_direction | (1u << off);
+	reg_val = chip->reg_direction[off / BANK_SZ] | (1u << (off % BANK_SZ));
 
 	switch (chip->chip_type) {
 	case PCA953X_TYPE:
@@ -179,11 +218,11 @@ static int pca953x_gpio_direction_input(struct gpio_chip *gc, unsigned off)
 		offset = PCA957X_CFG;
 		break;
 	}
-	ret = pca953x_write_reg(chip, offset, reg_val);
+	ret = pca953x_write_single(chip, offset, reg_val, off);
 	if (ret)
 		goto exit;
 
-	chip->reg_direction = reg_val;
+	chip->reg_direction[off / BANK_SZ] = reg_val;
 	ret = 0;
 exit:
 	mutex_unlock(&chip->i2c_lock);
@@ -194,7 +233,7 @@ static int pca953x_gpio_direction_output(struct gpio_chip *gc,
 		unsigned off, int val)
 {
 	struct pca953x_chip *chip;
-	uint reg_val;
+	u8 reg_val;
 	int ret, offset = 0;
 
 	chip = container_of(gc, struct pca953x_chip, gpio_chip);
@@ -202,9 +241,11 @@ static int pca953x_gpio_direction_output(struct gpio_chip *gc,
 	mutex_lock(&chip->i2c_lock);
 	/* set output level */
 	if (val)
-		reg_val = chip->reg_output | (1u << off);
+		reg_val = chip->reg_output[off / BANK_SZ]
+			| (1u << (off % BANK_SZ));
 	else
-		reg_val = chip->reg_output & ~(1u << off);
+		reg_val = chip->reg_output[off / BANK_SZ]
+			& ~(1u << (off % BANK_SZ));
 
 	switch (chip->chip_type) {
 	case PCA953X_TYPE:
@@ -214,14 +255,14 @@ static int pca953x_gpio_direction_output(struct gpio_chip *gc,
 		offset = PCA957X_OUT;
 		break;
 	}
-	ret = pca953x_write_reg(chip, offset, reg_val);
+	ret = pca953x_write_single(chip, offset, reg_val, off);
 	if (ret)
 		goto exit;
 
-	chip->reg_output = reg_val;
+	chip->reg_output[off / BANK_SZ] = reg_val;
 
 	/* then direction */
-	reg_val = chip->reg_direction & ~(1u << off);
+	reg_val = chip->reg_direction[off / BANK_SZ] & ~(1u << (off % BANK_SZ));
 	switch (chip->chip_type) {
 	case PCA953X_TYPE:
 		offset = PCA953X_DIRECTION;
@@ -230,11 +271,11 @@ static int pca953x_gpio_direction_output(struct gpio_chip *gc,
 		offset = PCA957X_CFG;
 		break;
 	}
-	ret = pca953x_write_reg(chip, offset, reg_val);
+	ret = pca953x_write_single(chip, offset, reg_val, off);
 	if (ret)
 		goto exit;
 
-	chip->reg_direction = reg_val;
+	chip->reg_direction[off / BANK_SZ] = reg_val;
 	ret = 0;
 exit:
 	mutex_unlock(&chip->i2c_lock);
@@ -258,7 +299,7 @@ static int pca953x_gpio_get_value(struct gpio_chip *gc, unsigned off)
 		offset = PCA957X_IN;
 		break;
 	}
-	ret = pca953x_read_reg(chip, offset, &reg_val);
+	ret = pca953x_read_single(chip, offset, &reg_val, off);
 	mutex_unlock(&chip->i2c_lock);
 	if (ret < 0) {
 		/* NOTE:  diagnostic already emitted; that's all we should
@@ -274,16 +315,18 @@ static int pca953x_gpio_get_value(struct gpio_chip *gc, unsigned off)
 static void pca953x_gpio_set_value(struct gpio_chip *gc, unsigned off, int val)
 {
 	struct pca953x_chip *chip;
-	u32 reg_val;
+	u8 reg_val;
 	int ret, offset = 0;
 
 	chip = container_of(gc, struct pca953x_chip, gpio_chip);
 
 	mutex_lock(&chip->i2c_lock);
 	if (val)
-		reg_val = chip->reg_output | (1u << off);
+		reg_val = chip->reg_output[off / BANK_SZ]
+			| (1u << (off % BANK_SZ));
 	else
-		reg_val = chip->reg_output & ~(1u << off);
+		reg_val = chip->reg_output[off / BANK_SZ]
+			& ~(1u << (off % BANK_SZ));
 
 	switch (chip->chip_type) {
 	case PCA953X_TYPE:
@@ -293,11 +336,11 @@ static void pca953x_gpio_set_value(struct gpio_chip *gc, unsigned off, int val)
 		offset = PCA957X_OUT;
 		break;
 	}
-	ret = pca953x_write_reg(chip, offset, reg_val);
+	ret = pca953x_write_single(chip, offset, reg_val, off);
 	if (ret)
 		goto exit;
 
-	chip->reg_output = reg_val;
+	chip->reg_output[off / BANK_SZ] = reg_val;
 exit:
 	mutex_unlock(&chip->i2c_lock);
 }
@@ -328,21 +371,21 @@ static int pca953x_gpio_to_irq(struct gpio_chip *gc, unsigned off)
 	struct pca953x_chip *chip;
 
 	chip = container_of(gc, struct pca953x_chip, gpio_chip);
-	return chip->irq_base + off;
+	return irq_create_mapping(chip->domain, off);
 }
 
 static void pca953x_irq_mask(struct irq_data *d)
 {
 	struct pca953x_chip *chip = irq_data_get_irq_chip_data(d);
 
-	chip->irq_mask &= ~(1 << d->hwirq);
+	chip->irq_mask[d->hwirq / BANK_SZ] &= ~(1 << (d->hwirq % BANK_SZ));
 }
 
 static void pca953x_irq_unmask(struct irq_data *d)
 {
 	struct pca953x_chip *chip = irq_data_get_irq_chip_data(d);
 
-	chip->irq_mask |= 1 << d->hwirq;
+	chip->irq_mask[d->hwirq / BANK_SZ] |= 1 << (d->hwirq % BANK_SZ);
 }
 
 static void pca953x_irq_bus_lock(struct irq_data *d)
@@ -355,17 +398,20 @@ static void pca953x_irq_bus_lock(struct irq_data *d)
 static void pca953x_irq_bus_sync_unlock(struct irq_data *d)
 {
 	struct pca953x_chip *chip = irq_data_get_irq_chip_data(d);
-	u32 new_irqs;
-	u32 level;
+	u8 new_irqs;
+	int level, i;
 
 	/* Look for any newly setup interrupt */
-	new_irqs = chip->irq_trig_fall | chip->irq_trig_raise;
-	new_irqs &= ~chip->reg_direction;
-
-	while (new_irqs) {
-		level = __ffs(new_irqs);
-		pca953x_gpio_direction_input(&chip->gpio_chip, level);
-		new_irqs &= ~(1 << level);
+	for (i = 0; i < NBANK(chip); i++) {
+		new_irqs = chip->irq_trig_fall[i] | chip->irq_trig_raise[i];
+		new_irqs &= ~chip->reg_direction[i];
+
+		while (new_irqs) {
+			level = __ffs(new_irqs);
+			pca953x_gpio_direction_input(&chip->gpio_chip,
+							level + (BANK_SZ * i));
+			new_irqs &= ~(1 << level);
+		}
 	}
 
 	mutex_unlock(&chip->irq_lock);
@@ -374,7 +420,8 @@ static void pca953x_irq_bus_sync_unlock(struct irq_data *d)
 static int pca953x_irq_set_type(struct irq_data *d, unsigned int type)
 {
 	struct pca953x_chip *chip = irq_data_get_irq_chip_data(d);
-	u32 mask = 1 << d->hwirq;
+	int bank_nb = d->hwirq / BANK_SZ;
+	u8 mask = 1 << (d->hwirq % BANK_SZ);
 
 	if (!(type & IRQ_TYPE_EDGE_BOTH)) {
 		dev_err(&chip->client->dev, "irq %d: unsupported type %d\n",
@@ -383,14 +430,14 @@ static int pca953x_irq_set_type(struct irq_data *d, unsigned int type)
 	}
 
 	if (type & IRQ_TYPE_EDGE_FALLING)
-		chip->irq_trig_fall |= mask;
+		chip->irq_trig_fall[bank_nb] |= mask;
 	else
-		chip->irq_trig_fall &= ~mask;
+		chip->irq_trig_fall[bank_nb] &= ~mask;
 
 	if (type & IRQ_TYPE_EDGE_RISING)
-		chip->irq_trig_raise |= mask;
+		chip->irq_trig_raise[bank_nb] |= mask;
 	else
-		chip->irq_trig_raise &= ~mask;
+		chip->irq_trig_raise[bank_nb] &= ~mask;
 
 	return 0;
 }
@@ -404,13 +451,13 @@ static struct irq_chip pca953x_irq_chip = {
 	.irq_set_type		= pca953x_irq_set_type,
 };
 
-static u32 pca953x_irq_pending(struct pca953x_chip *chip)
+static u8 pca953x_irq_pending(struct pca953x_chip *chip, u8 *pending)
 {
-	u32 cur_stat;
-	u32 old_stat;
-	u32 pending;
-	u32 trigger;
-	int ret, offset = 0;
+	u8 cur_stat[MAX_BANK];
+	u8 old_stat[MAX_BANK];
+	u8 pendings = 0;
+	u8 trigger[MAX_BANK], triggers = 0;
+	int ret, i, offset = 0;
 
 	switch (chip->chip_type) {
 	case PCA953X_TYPE:
@@ -420,60 +467,88 @@ static u32 pca953x_irq_pending(struct pca953x_chip *chip)
 		offset = PCA957X_IN;
 		break;
 	}
-	ret = pca953x_read_reg(chip, offset, &cur_stat);
+	ret = pca953x_read_regs(chip, offset, cur_stat);
 	if (ret)
 		return 0;
 
 	/* Remove output pins from the equation */
-	cur_stat &= chip->reg_direction;
+	for (i = 0; i < NBANK(chip); i++)
+		cur_stat[i] &= chip->reg_direction[i];
+
+	memcpy(old_stat, chip->irq_stat, NBANK(chip));
 
-	old_stat = chip->irq_stat;
-	trigger = (cur_stat ^ old_stat) & chip->irq_mask;
+	for (i = 0; i < NBANK(chip); i++) {
+		trigger[i] = (cur_stat[i] ^ old_stat[i]) & chip->irq_mask[i];
+		triggers += trigger[i];
+	}
 
-	if (!trigger)
+	if (!triggers)
 		return 0;
 
-	chip->irq_stat = cur_stat;
+	memcpy(chip->irq_stat, cur_stat, NBANK(chip));
 
-	pending = (old_stat & chip->irq_trig_fall) |
-		  (cur_stat & chip->irq_trig_raise);
-	pending &= trigger;
+	for (i = 0; i < NBANK(chip); i++) {
+		pending[i] = (old_stat[i] & chip->irq_trig_fall[i]) |
+			(cur_stat[i] & chip->irq_trig_raise[i]);
+		pending[i] &= trigger[i];
+		pendings += pending[i];
+	}
 
-	return pending;
+	return pendings;
 }
 
 static irqreturn_t pca953x_irq_handler(int irq, void *devid)
 {
 	struct pca953x_chip *chip = devid;
-	u32 pending;
-	u32 level;
-
-	pending = pca953x_irq_pending(chip);
+	u8 pending[MAX_BANK];
+	u8 level;
+	int i;
 
-	if (!pending)
+	if (!pca953x_irq_pending(chip, pending))
 		return IRQ_HANDLED;
 
-	do {
-		level = __ffs(pending);
-		handle_nested_irq(irq_find_mapping(chip->domain, level));
-
-		pending &= ~(1 << level);
-	} while (pending);
+	for (i = 0; i < NBANK(chip); i++) {
+		while (pending[i]) {
+			level = __ffs(pending[i]);
+			handle_nested_irq(irq_find_mapping(chip->domain,
+							level + (BANK_SZ * i)));
+			pending[i] &= ~(1 << level);
+		}
+	}
 
 	return IRQ_HANDLED;
 }
 
+static int pca953x_gpio_irq_map(struct irq_domain *d, unsigned int irq,
+		       irq_hw_number_t hwirq)
+{
+	irq_clear_status_flags(irq, IRQ_NOREQUEST);
+	irq_set_chip_data(irq, d->host_data);
+	irq_set_chip(irq, &pca953x_irq_chip);
+	irq_set_nested_thread(irq, true);
+#ifdef CONFIG_ARM
+	set_irq_flags(irq, IRQF_VALID);
+#else
+	irq_set_noprobe(irq);
+#endif
+
+	return 0;
+}
+
+static const struct irq_domain_ops pca953x_irq_simple_ops = {
+	.map = pca953x_gpio_irq_map,
+	.xlate = irq_domain_xlate_twocell,
+};
+
 static int pca953x_irq_setup(struct pca953x_chip *chip,
 			     const struct i2c_device_id *id,
 			     int irq_base)
 {
 	struct i2c_client *client = chip->client;
-	int ret, offset = 0;
-	u32 temporary;
+	int ret, i, offset = 0;
 
 	if (irq_base != -1
 			&& (id->driver_data & PCA_INT)) {
-		int lvl;
 
 		switch (chip->chip_type) {
 		case PCA953X_TYPE:
@@ -483,49 +558,29 @@ static int pca953x_irq_setup(struct pca953x_chip *chip,
 			offset = PCA957X_IN;
 			break;
 		}
-		ret = pca953x_read_reg(chip, offset, &temporary);
-		chip->irq_stat = temporary;
+		ret = pca953x_read_regs(chip, offset, chip->irq_stat);
 		if (ret)
-			goto out_failed;
+			return ret;
 
 		/*
 		 * There is no way to know which GPIO line generated the
 		 * interrupt.  We have to rely on the previous read for
 		 * this purpose.
 		 */
-		chip->irq_stat &= chip->reg_direction;
+		for (i = 0; i < NBANK(chip); i++)
+			chip->irq_stat[i] &= chip->reg_direction[i];
 		mutex_init(&chip->irq_lock);
 
-		chip->irq_base = irq_alloc_descs(-1, irq_base, chip->gpio_chip.ngpio, -1);
-		if (chip->irq_base < 0)
-			goto out_failed;
-
-		chip->domain = irq_domain_add_legacy(client->dev.of_node,
+		chip->domain = irq_domain_add_simple(client->dev.of_node,
 						chip->gpio_chip.ngpio,
-						chip->irq_base,
-						0,
-						&irq_domain_simple_ops,
+						irq_base,
+						&pca953x_irq_simple_ops,
 						NULL);
-		if (!chip->domain) {
-			ret = -ENODEV;
-			goto out_irqdesc_free;
-		}
+		if (!chip->domain)
+			return -ENODEV;
 
-		for (lvl = 0; lvl < chip->gpio_chip.ngpio; lvl++) {
-			int irq = lvl + chip->irq_base;
-
-			irq_clear_status_flags(irq, IRQ_NOREQUEST);
-			irq_set_chip_data(irq, chip);
-			irq_set_chip(irq, &pca953x_irq_chip);
-			irq_set_nested_thread(irq, true);
-#ifdef CONFIG_ARM
-			set_irq_flags(irq, IRQF_VALID);
-#else
-			irq_set_noprobe(irq);
-#endif
-		}
-
-		ret = request_threaded_irq(client->irq,
+		ret = devm_request_threaded_irq(&client->dev,
+					client->irq,
 					   NULL,
 					   pca953x_irq_handler,
 					   IRQF_TRIGGER_LOW | IRQF_ONESHOT,
@@ -533,28 +588,15 @@ static int pca953x_irq_setup(struct pca953x_chip *chip,
 		if (ret) {
 			dev_err(&client->dev, "failed to request irq %d\n",
 				client->irq);
-			goto out_irqdesc_free;
+			return ret;
 		}
 
 		chip->gpio_chip.to_irq = pca953x_gpio_to_irq;
 	}
 
 	return 0;
-
-out_irqdesc_free:
-	irq_free_descs(chip->irq_base, chip->gpio_chip.ngpio);
-out_failed:
-	chip->irq_base = -1;
-	return ret;
 }
 
-static void pca953x_irq_teardown(struct pca953x_chip *chip)
-{
-	if (chip->irq_base != -1) {
-		irq_free_descs(chip->irq_base, chip->gpio_chip.ngpio);
-		free_irq(chip->client->irq, chip);
-	}
-}
 #else /* CONFIG_GPIO_PCA953X_IRQ */
 static int pca953x_irq_setup(struct pca953x_chip *chip,
 			     const struct i2c_device_id *id,
@@ -567,10 +609,6 @@ static int pca953x_irq_setup(struct pca953x_chip *chip,
 
 	return 0;
 }
-
-static void pca953x_irq_teardown(struct pca953x_chip *chip)
-{
-}
 #endif
 
 /*
@@ -619,18 +657,24 @@ pca953x_get_alt_pdata(struct i2c_client *client, int *gpio_base, u32 *invert)
 static int device_pca953x_init(struct pca953x_chip *chip, u32 invert)
 {
 	int ret;
+	u8 val[MAX_BANK];
 
-	ret = pca953x_read_reg(chip, PCA953X_OUTPUT, &chip->reg_output);
+	ret = pca953x_read_regs(chip, PCA953X_OUTPUT, chip->reg_output);
 	if (ret)
 		goto out;
 
-	ret = pca953x_read_reg(chip, PCA953X_DIRECTION,
-			       &chip->reg_direction);
+	ret = pca953x_read_regs(chip, PCA953X_DIRECTION,
+			       chip->reg_direction);
 	if (ret)
 		goto out;
 
 	/* set platform specific polarity inversion */
-	ret = pca953x_write_reg(chip, PCA953X_INVERT, invert);
+	if (invert)
+		memset(val, 0xFF, NBANK(chip));
+	else
+		memset(val, 0, NBANK(chip));
+
+	ret = pca953x_write_regs(chip, PCA953X_INVERT, val);
 out:
 	return ret;
 }
@@ -638,28 +682,36 @@ static int device_pca953x_init(struct pca953x_chip *chip, u32 invert)
 static int device_pca957x_init(struct pca953x_chip *chip, u32 invert)
 {
 	int ret;
-	u32 val = 0;
+	u8 val[MAX_BANK];
 
 	/* Let every port in proper state, that could save power */
-	pca953x_write_reg(chip, PCA957X_PUPD, 0x0);
-	pca953x_write_reg(chip, PCA957X_CFG, 0xffff);
-	pca953x_write_reg(chip, PCA957X_OUT, 0x0);
-
-	ret = pca953x_read_reg(chip, PCA957X_IN, &val);
+	memset(val, 0, NBANK(chip));
+	pca953x_write_regs(chip, PCA957X_PUPD, val);
+	memset(val, 0xFF, NBANK(chip));
+	pca953x_write_regs(chip, PCA957X_CFG, val);
+	memset(val, 0, NBANK(chip));
+	pca953x_write_regs(chip, PCA957X_OUT, val);
+
+	ret = pca953x_read_regs(chip, PCA957X_IN, val);
 	if (ret)
 		goto out;
-	ret = pca953x_read_reg(chip, PCA957X_OUT, &chip->reg_output);
+	ret = pca953x_read_regs(chip, PCA957X_OUT, chip->reg_output);
 	if (ret)
 		goto out;
-	ret = pca953x_read_reg(chip, PCA957X_CFG, &chip->reg_direction);
+	ret = pca953x_read_regs(chip, PCA957X_CFG, chip->reg_direction);
 	if (ret)
 		goto out;
 
 	/* set platform specific polarity inversion */
-	pca953x_write_reg(chip, PCA957X_INVRT, invert);
+	if (invert)
+		memset(val, 0xFF, NBANK(chip));
+	else
+		memset(val, 0, NBANK(chip));
+	pca953x_write_regs(chip, PCA957X_INVRT, val);
 
 	/* To enable register 6, 7 to controll pull up and pull down */
-	pca953x_write_reg(chip, PCA957X_BKEN, 0x202);
+	memset(val, 0x02, NBANK(chip));
+	pca953x_write_regs(chip, PCA957X_BKEN, val);
 
 	return 0;
 out:
@@ -675,7 +727,8 @@ static int pca953x_probe(struct i2c_client *client,
 	int ret;
 	u32 invert = 0;
 
-	chip = kzalloc(sizeof(struct pca953x_chip), GFP_KERNEL);
+	chip = devm_kzalloc(&client->dev,
+			sizeof(struct pca953x_chip), GFP_KERNEL);
 	if (chip == NULL)
 		return -ENOMEM;
 
@@ -710,15 +763,15 @@ static int pca953x_probe(struct i2c_client *client,
 	else
 		ret = device_pca957x_init(chip, invert);
 	if (ret)
-		goto out_failed;
+		return ret;
 
 	ret = pca953x_irq_setup(chip, id, irq_base);
 	if (ret)
-		goto out_failed;
+		return ret;
 
 	ret = gpiochip_add(&chip->gpio_chip);
 	if (ret)
-		goto out_failed_irq;
+		return ret;
 
 	if (pdata && pdata->setup) {
 		ret = pdata->setup(client, chip->gpio_chip.base,
@@ -729,12 +782,6 @@ static int pca953x_probe(struct i2c_client *client,
 
 	i2c_set_clientdata(client, chip);
 	return 0;
-
-out_failed_irq:
-	pca953x_irq_teardown(chip);
-out_failed:
-	kfree(chip);
-	return ret;
 }
 
 static int pca953x_remove(struct i2c_client *client)
@@ -760,12 +807,11 @@ static int pca953x_remove(struct i2c_client *client)
 		return ret;
 	}
 
-	pca953x_irq_teardown(chip);
-	kfree(chip);
 	return 0;
 }
 
 static const struct of_device_id pca953x_dt_ids[] = {
+	{ .compatible = "nxp,pca9505", },
 	{ .compatible = "nxp,pca9534", },
 	{ .compatible = "nxp,pca9535", },
 	{ .compatible = "nxp,pca9536", },

drivers/gpio/gpio-pl061.c

@@ -365,7 +365,7 @@ static int __init pl061_gpio_init(void)
 {
 	return amba_driver_register(&pl061_gpio_driver);
 }
-subsys_initcall(pl061_gpio_init);
+module_init(pl061_gpio_init);
 
 MODULE_AUTHOR("Baruch Siach <baruch@tkos.co.il>");
 MODULE_DESCRIPTION("PL061 GPIO driver");

drivers/gpio/gpio-pxa.c

@@ -642,12 +642,7 @@ static struct platform_driver pxa_gpio_driver = {
 		.of_match_table = of_match_ptr(pxa_gpio_dt_ids),
 	},
 };
-
-static int __init pxa_gpio_init(void)
-{
-	return platform_driver_register(&pxa_gpio_driver);
-}
-postcore_initcall(pxa_gpio_init);
+module_platform_driver(pxa_gpio_driver);
 
 #ifdef CONFIG_PM
 static int pxa_gpio_suspend(void)

drivers/gpio/gpio-twl4030.c

@@ -37,7 +37,6 @@
 
 #include <linux/i2c/twl.h>
 
-
 /*
  * The GPIO "subchip" supports 18 GPIOs which can be configured as
  * inputs or outputs, with pullups or pulldowns on each pin.  Each
@@ -49,11 +48,6 @@
  * There are also two LED pins used sometimes as output-only GPIOs.
  */
 
-
-static struct gpio_chip twl_gpiochip;
-static int twl4030_gpio_base;
-static int twl4030_gpio_irq_base;
-
 /* genirq interfaces are not available to modules */
 #ifdef MODULE
 #define is_module()	true
@@ -69,14 +63,24 @@ static int twl4030_gpio_irq_base;
 /* Mask for GPIO registers when aggregated into a 32-bit integer */
 #define GPIO_32_MASK			0x0003ffff
 
-/* Data structures */
-static DEFINE_MUTEX(gpio_lock);
+struct gpio_twl4030_priv {
+	struct gpio_chip gpio_chip;
+	struct mutex mutex;
+	int irq_base;
 
-/* store usage of each GPIO. - each bit represents one GPIO */
-static unsigned int gpio_usage_count;
+	/* Bitfields for state caching */
+	unsigned int usage_count;
+	unsigned int direction;
+	unsigned int out_state;
+};
 
 /*----------------------------------------------------------------------*/
 
+static inline struct gpio_twl4030_priv *to_gpio_twl4030(struct gpio_chip *chip)
+{
+	return container_of(chip, struct gpio_twl4030_priv, gpio_chip);
+}
+
 /*
  * To configure TWL4030 GPIO module registers
  */
@@ -126,7 +130,7 @@ static inline int gpio_twl4030_read(u8 address)
 
 /*----------------------------------------------------------------------*/
 
-static u8 cached_leden;		/* protected by gpio_lock */
+static u8 cached_leden;
 
 /* The LED lines are open drain outputs ... a FET pulls to GND, so an
  * external pullup is needed.  We could also expose the integrated PWM
@@ -140,14 +144,12 @@ static void twl4030_led_set_value(int led, int value)
 	if (led)
 		mask <<= 1;
 
-	mutex_lock(&gpio_lock);
 	if (value)
 		cached_leden &= ~mask;
 	else
 		cached_leden |= mask;
 	status = twl_i2c_write_u8(TWL4030_MODULE_LED, cached_leden,
 				  TWL4030_LED_LEDEN_REG);
-	mutex_unlock(&gpio_lock);
 }
 
 static int twl4030_set_gpio_direction(int gpio, int is_input)
@@ -158,7 +160,6 @@ static int twl4030_set_gpio_direction(int gpio, int is_input)
 	u8 base = REG_GPIODATADIR1 + d_bnk;
 	int ret = 0;
 
-	mutex_lock(&gpio_lock);
 	ret = gpio_twl4030_read(base);
 	if (ret >= 0) {
 		if (is_input)
@@ -168,7 +169,6 @@ static int twl4030_set_gpio_direction(int gpio, int is_input)
 
 		ret = gpio_twl4030_write(base, reg);
 	}
-	mutex_unlock(&gpio_lock);
 	return ret;
 }
 
@@ -193,10 +193,6 @@ static int twl4030_get_gpio_datain(int gpio)
 	u8 base = 0;
 	int ret = 0;
 
-	if (unlikely((gpio >= TWL4030_GPIO_MAX)
-		|| !(gpio_usage_count & BIT(gpio))))
-		return -EPERM;
-
 	base = REG_GPIODATAIN1 + d_bnk;
 	ret = gpio_twl4030_read(base);
 	if (ret > 0)
@@ -209,9 +205,10 @@ static int twl4030_get_gpio_datain(int gpio)
 
 static int twl_request(struct gpio_chip *chip, unsigned offset)
 {
+	struct gpio_twl4030_priv *priv = to_gpio_twl4030(chip);
 	int status = 0;
 
-	mutex_lock(&gpio_lock);
+	mutex_lock(&priv->mutex);
 
 	/* Support the two LED outputs as output-only GPIOs. */
 	if (offset >= TWL4030_GPIO_MAX) {
@@ -252,7 +249,7 @@ static int twl_request(struct gpio_chip *chip, unsigned offset)
 	}
 
 	/* on first use, turn GPIO module "on" */
-	if (!gpio_usage_count) {
+	if (!priv->usage_count) {
 		struct twl4030_gpio_platform_data *pdata;
 		u8 value = MASK_GPIO_CTRL_GPIO_ON;
 
@@ -266,79 +263,120 @@ static int twl_request(struct gpio_chip *chip, unsigned offset)
 		status = gpio_twl4030_write(REG_GPIO_CTRL, value);
 	}
 
+done:
 	if (!status)
-		gpio_usage_count |= (0x1 << offset);
+		priv->usage_count |= BIT(offset);
 
-done:
-	mutex_unlock(&gpio_lock);
+	mutex_unlock(&priv->mutex);
 	return status;
 }
 
 static void twl_free(struct gpio_chip *chip, unsigned offset)
 {
+	struct gpio_twl4030_priv *priv = to_gpio_twl4030(chip);
+
+	mutex_lock(&priv->mutex);
 	if (offset >= TWL4030_GPIO_MAX) {
 		twl4030_led_set_value(offset - TWL4030_GPIO_MAX, 1);
-		return;
+		goto out;
 	}
 
-	mutex_lock(&gpio_lock);
-
-	gpio_usage_count &= ~BIT(offset);
+	priv->usage_count &= ~BIT(offset);
 
 	/* on last use, switch off GPIO module */
-	if (!gpio_usage_count)
+	if (!priv->usage_count)
 		gpio_twl4030_write(REG_GPIO_CTRL, 0x0);
 
-	mutex_unlock(&gpio_lock);
+out:
+	mutex_unlock(&priv->mutex);
 }
 
 static int twl_direction_in(struct gpio_chip *chip, unsigned offset)
 {
-	return (offset < TWL4030_GPIO_MAX)
-		? twl4030_set_gpio_direction(offset, 1)
-		: -EINVAL;
+	struct gpio_twl4030_priv *priv = to_gpio_twl4030(chip);
+	int ret;
+
+	mutex_lock(&priv->mutex);
+	if (offset < TWL4030_GPIO_MAX)
+		ret = twl4030_set_gpio_direction(offset, 1);
+	else
+		ret = -EINVAL;
+
+	if (!ret)
+		priv->direction &= ~BIT(offset);
+
+	mutex_unlock(&priv->mutex);
+
+	return ret;
 }
 
 static int twl_get(struct gpio_chip *chip, unsigned offset)
 {
+	struct gpio_twl4030_priv *priv = to_gpio_twl4030(chip);
+	int ret;
 	int status = 0;
 
-	if (offset < TWL4030_GPIO_MAX)
-		status = twl4030_get_gpio_datain(offset);
-	else if (offset == TWL4030_GPIO_MAX)
-		status = cached_leden & LEDEN_LEDAON;
+	mutex_lock(&priv->mutex);
+	if (!(priv->usage_count & BIT(offset))) {
+		ret = -EPERM;
+		goto out;
+	}
+
+	if (priv->direction & BIT(offset))
+		status = priv->out_state & BIT(offset);
 	else
-		status = cached_leden & LEDEN_LEDBON;
-	return (status < 0) ? 0 : status;
+		status = twl4030_get_gpio_datain(offset);
+
+	ret = (status <= 0) ? 0 : 1;
+out:
+	mutex_unlock(&priv->mutex);
+	return ret;
 }
 
-static int twl_direction_out(struct gpio_chip *chip, unsigned offset, int value)
+static void twl_set(struct gpio_chip *chip, unsigned offset, int value)
 {
-	if (offset < TWL4030_GPIO_MAX) {
+	struct gpio_twl4030_priv *priv = to_gpio_twl4030(chip);
+
+	mutex_lock(&priv->mutex);
+	if (offset < TWL4030_GPIO_MAX)
 		twl4030_set_gpio_dataout(offset, value);
-		return twl4030_set_gpio_direction(offset, 0);
-	} else {
+	else
 		twl4030_led_set_value(offset - TWL4030_GPIO_MAX, value);
-		return 0;
-	}
+
+	if (value)
+		priv->out_state |= BIT(offset);
+	else
+		priv->out_state &= ~BIT(offset);
+
+	mutex_unlock(&priv->mutex);
 }
 
-static void twl_set(struct gpio_chip *chip, unsigned offset, int value)
+static int twl_direction_out(struct gpio_chip *chip, unsigned offset, int value)
 {
+	struct gpio_twl4030_priv *priv = to_gpio_twl4030(chip);
+
+	mutex_lock(&priv->mutex);
 	if (offset < TWL4030_GPIO_MAX)
 		twl4030_set_gpio_dataout(offset, value);
-	else
-		twl4030_led_set_value(offset - TWL4030_GPIO_MAX, value);
+
+	priv->direction |= BIT(offset);
+	mutex_unlock(&priv->mutex);
+
+	twl_set(chip, offset, value);
+
+	return 0;
 }
 
 static int twl_to_irq(struct gpio_chip *chip, unsigned offset)
 {
-	return (twl4030_gpio_irq_base && (offset < TWL4030_GPIO_MAX))
-		? (twl4030_gpio_irq_base + offset)
+	struct gpio_twl4030_priv *priv = to_gpio_twl4030(chip);
+
+	return (priv->irq_base && (offset < TWL4030_GPIO_MAX))
+		? (priv->irq_base + offset)
 		: -EINVAL;
 }
 
-static struct gpio_chip twl_gpiochip = {
+static struct gpio_chip template_chip = {
 	.label			= "twl4030",
 	.owner			= THIS_MODULE,
 	.request		= twl_request,
@@ -424,8 +462,14 @@ static int gpio_twl4030_probe(struct platform_device *pdev)
 {
 	struct twl4030_gpio_platform_data *pdata = pdev->dev.platform_data;
 	struct device_node *node = pdev->dev.of_node;
+	struct gpio_twl4030_priv *priv;
 	int ret, irq_base;
 
+	priv = devm_kzalloc(&pdev->dev, sizeof(struct gpio_twl4030_priv),
+			    GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
 	/* maybe setup IRQs */
 	if (is_module()) {
 		dev_err(&pdev->dev, "can't dispatch IRQs from modules\n");
@@ -445,12 +489,15 @@ static int gpio_twl4030_probe(struct platform_device *pdev)
 	if (ret < 0)
 		return ret;
 
-	twl4030_gpio_irq_base = irq_base;
+	priv->irq_base = irq_base;
 
 no_irqs:
-	twl_gpiochip.base = -1;
-	twl_gpiochip.ngpio = TWL4030_GPIO_MAX;
-	twl_gpiochip.dev = &pdev->dev;
+	priv->gpio_chip = template_chip;
+	priv->gpio_chip.base = -1;
+	priv->gpio_chip.ngpio = TWL4030_GPIO_MAX;
+	priv->gpio_chip.dev = &pdev->dev;
+
+	mutex_init(&priv->mutex);
 
 	if (node)
 		pdata = of_gpio_twl4030(&pdev->dev);
@@ -481,23 +528,23 @@ static int gpio_twl4030_probe(struct platform_device *pdev)
 	 * is (still) clear if use_leds is set.
 	 */
 	if (pdata->use_leds)
-		twl_gpiochip.ngpio += 2;
+		priv->gpio_chip.ngpio += 2;
 
-	ret = gpiochip_add(&twl_gpiochip);
+	ret = gpiochip_add(&priv->gpio_chip);
 	if (ret < 0) {
 		dev_err(&pdev->dev, "could not register gpiochip, %d\n", ret);
-		twl_gpiochip.ngpio = 0;
+		priv->gpio_chip.ngpio = 0;
 		gpio_twl4030_remove(pdev);
 		goto out;
 	}
 
-	twl4030_gpio_base = twl_gpiochip.base;
+	platform_set_drvdata(pdev, priv);
 
 	if (pdata && pdata->setup) {
 		int status;
 
-		status = pdata->setup(&pdev->dev,
-				twl4030_gpio_base, TWL4030_GPIO_MAX);
+		status = pdata->setup(&pdev->dev, priv->gpio_chip.base,
+				      TWL4030_GPIO_MAX);
 		if (status)
 			dev_dbg(&pdev->dev, "setup --> %d\n", status);
 	}
@@ -510,18 +557,19 @@ static int gpio_twl4030_probe(struct platform_device *pdev)
 static int gpio_twl4030_remove(struct platform_device *pdev)
 {
 	struct twl4030_gpio_platform_data *pdata = pdev->dev.platform_data;
+	struct gpio_twl4030_priv *priv = platform_get_drvdata(pdev);
 	int status;
 
 	if (pdata && pdata->teardown) {
-		status = pdata->teardown(&pdev->dev,
-				twl4030_gpio_base, TWL4030_GPIO_MAX);
+		status = pdata->teardown(&pdev->dev, priv->gpio_chip.base,
+					 TWL4030_GPIO_MAX);
 		if (status) {
 			dev_dbg(&pdev->dev, "teardown --> %d\n", status);
 			return status;
 		}
 	}
 
-	status = gpiochip_remove(&twl_gpiochip);
+	status = gpiochip_remove(&priv->gpio_chip);
 	if (status < 0)
 		return status;
 

drivers/gpio/gpio-vt8500.c

@@ -73,19 +73,20 @@ struct vt8500_gpio_data {
 static struct vt8500_gpio_data vt8500_data = {
 	.num_banks	= 7,
 	.banks	= {
+		VT8500_BANK(NO_REG, 0x3C, 0x5C, 0x7C, 9),
 		VT8500_BANK(0x00, 0x20, 0x40, 0x60, 26),
 		VT8500_BANK(0x04, 0x24, 0x44, 0x64, 28),
 		VT8500_BANK(0x08, 0x28, 0x48, 0x68, 31),
 		VT8500_BANK(0x0C, 0x2C, 0x4C, 0x6C, 19),
 		VT8500_BANK(0x10, 0x30, 0x50, 0x70, 19),
 		VT8500_BANK(0x14, 0x34, 0x54, 0x74, 23),
-		VT8500_BANK(NO_REG, 0x3C, 0x5C, 0x7C, 9),
 	},
 };
 
 static struct vt8500_gpio_data wm8505_data = {
 	.num_banks	= 10,
 	.banks	= {
+		VT8500_BANK(0x64, 0x8C, 0xB4, 0xDC, 22),
 		VT8500_BANK(0x40, 0x68, 0x90, 0xB8, 8),
 		VT8500_BANK(0x44, 0x6C, 0x94, 0xBC, 32),
 		VT8500_BANK(0x48, 0x70, 0x98, 0xC0, 6),
@@ -95,7 +96,6 @@ static struct vt8500_gpio_data wm8505_data = {
 		VT8500_BANK(0x58, 0x80, 0xA8, 0xD0, 5),
 		VT8500_BANK(0x5C, 0x84, 0xAC, 0xD4, 12),
 		VT8500_BANK(0x60, 0x88, 0xB0, 0xD8, 16),
-		VT8500_BANK(0x64, 0x8C, 0xB4, 0xDC, 22),
 		VT8500_BANK(0x500, 0x504, 0x508, 0x50C, 6),
 	},
 };

drivers/gpio/gpiolib-acpi.c

@@ -15,6 +15,7 @@
 #include <linux/export.h>
 #include <linux/acpi_gpio.h>
 #include <linux/acpi.h>
+#include <linux/interrupt.h>
 
 static int acpi_gpiochip_find(struct gpio_chip *gc, void *data)
 {
@@ -52,3 +53,89 @@ int acpi_get_gpio(char *path, int pin)
 	return chip->base + pin;
 }
 EXPORT_SYMBOL_GPL(acpi_get_gpio);
+
+
+static irqreturn_t acpi_gpio_irq_handler(int irq, void *data)
+{
+	acpi_handle handle = data;
+
+	acpi_evaluate_object(handle, NULL, NULL, NULL);
+
+	return IRQ_HANDLED;
+}
+
+/**
+ * acpi_gpiochip_request_interrupts() - Register isr for gpio chip ACPI events
+ * @chip:      gpio chip
+ *
+ * ACPI5 platforms can use GPIO signaled ACPI events. These GPIO interrupts are
+ * handled by ACPI event methods which need to be called from the GPIO
+ * chip's interrupt handler. acpi_gpiochip_request_interrupts finds out which
+ * gpio pins have acpi event methods and assigns interrupt handlers that calls
+ * the acpi event methods for those pins.
+ *
+ * Interrupts are automatically freed on driver detach
+ */
+
+void acpi_gpiochip_request_interrupts(struct gpio_chip *chip)
+{
+	struct acpi_buffer buf = {ACPI_ALLOCATE_BUFFER, NULL};
+	struct acpi_resource *res;
+	acpi_handle handle, ev_handle;
+	acpi_status status;
+	unsigned int pin;
+	int irq, ret;
+	char ev_name[5];
+
+	if (!chip->dev || !chip->to_irq)
+		return;
+
+	handle = ACPI_HANDLE(chip->dev);
+	if (!handle)
+		return;
+
+	status = acpi_get_event_resources(handle, &buf);
+	if (ACPI_FAILURE(status))
+		return;
+
+	/* If a gpio interrupt has an acpi event handler method, then
+	 * set up an interrupt handler that calls the acpi event handler
+	 */
+
+	for (res = buf.pointer;
+	     res && (res->type != ACPI_RESOURCE_TYPE_END_TAG);
+	     res = ACPI_NEXT_RESOURCE(res)) {
+
+		if (res->type != ACPI_RESOURCE_TYPE_GPIO ||
+		    res->data.gpio.connection_type !=
+		    ACPI_RESOURCE_GPIO_TYPE_INT)
+			continue;
+
+		pin = res->data.gpio.pin_table[0];
+		if (pin > chip->ngpio)
+			continue;
+
+		sprintf(ev_name, "_%c%02X",
+		res->data.gpio.triggering ? 'E' : 'L', pin);
+
+		status = acpi_get_handle(handle, ev_name, &ev_handle);
+		if (ACPI_FAILURE(status))
+			continue;
+
+		irq = chip->to_irq(chip, pin);
+		if (irq < 0)
+			continue;
+
+		/* Assume BIOS sets the triggering, so no flags */
+		ret = devm_request_threaded_irq(chip->dev, irq, NULL,
+					  acpi_gpio_irq_handler,
+					  0,
+					  "GPIO-signaled-ACPI-event",
+					  ev_handle);
+		if (ret)
+			dev_err(chip->dev,
+				"Failed to request IRQ %d ACPI event handler\n",
+				irq);
+	}
+}
+EXPORT_SYMBOL(acpi_gpiochip_request_interrupts);

drivers/gpio/gpiolib.c

@@ -52,14 +52,13 @@ struct gpio_desc {
 /* flag symbols are bit numbers */
 #define FLAG_REQUESTED	0
 #define FLAG_IS_OUT	1
-#define FLAG_RESERVED	2
-#define FLAG_EXPORT	3	/* protected by sysfs_lock */
-#define FLAG_SYSFS	4	/* exported via /sys/class/gpio/control */
-#define FLAG_TRIG_FALL	5	/* trigger on falling edge */
-#define FLAG_TRIG_RISE	6	/* trigger on rising edge */
-#define FLAG_ACTIVE_LOW	7	/* sysfs value has active low */
-#define FLAG_OPEN_DRAIN	8	/* Gpio is open drain type */
-#define FLAG_OPEN_SOURCE 9	/* Gpio is open source type */
+#define FLAG_EXPORT	2	/* protected by sysfs_lock */
+#define FLAG_SYSFS	3	/* exported via /sys/class/gpio/control */
+#define FLAG_TRIG_FALL	4	/* trigger on falling edge */
+#define FLAG_TRIG_RISE	5	/* trigger on rising edge */
+#define FLAG_ACTIVE_LOW	6	/* sysfs value has active low */
+#define FLAG_OPEN_DRAIN	7	/* Gpio is open drain type */
+#define FLAG_OPEN_SOURCE 8	/* Gpio is open source type */
 
 #define ID_SHIFT	16	/* add new flags before this one */
 
@@ -132,7 +131,7 @@ static int gpiochip_find_base(int ngpio)
 		struct gpio_desc *desc = &gpio_desc[i];
 		struct gpio_chip *chip = desc->chip;
 
-		if (!chip && !test_bit(FLAG_RESERVED, &desc->flags)) {
+		if (!chip) {
 			spare++;
 			if (spare == ngpio) {
 				base = i;
@@ -150,47 +149,6 @@ static int gpiochip_find_base(int ngpio)
 	return base;
 }
 
-/**
- * gpiochip_reserve() - reserve range of gpios to use with platform code only
- * @start: starting gpio number
- * @ngpio: number of gpios to reserve
- * Context: platform init, potentially before irqs or kmalloc will work
- *
- * Returns a negative errno if any gpio within the range is already reserved
- * or registered, else returns zero as a success code.  Use this function
- * to mark a range of gpios as unavailable for dynamic gpio number allocation,
- * for example because its driver support is not yet loaded.
- */
-int __init gpiochip_reserve(int start, int ngpio)
-{
-	int ret = 0;
-	unsigned long flags;
-	int i;
-
-	if (!gpio_is_valid(start) || !gpio_is_valid(start + ngpio - 1))
-		return -EINVAL;
-
-	spin_lock_irqsave(&gpio_lock, flags);
-
-	for (i = start; i < start + ngpio; i++) {
-		struct gpio_desc *desc = &gpio_desc[i];
-
-		if (desc->chip || test_bit(FLAG_RESERVED, &desc->flags)) {
-			ret = -EBUSY;
-			goto err;
-		}
-
-		set_bit(FLAG_RESERVED, &desc->flags);
-	}
-
-	pr_debug("%s: reserved gpios from %d to %d\n",
-		 __func__, start, start + ngpio - 1);
-err:
-	spin_unlock_irqrestore(&gpio_lock, flags);
-
-	return ret;
-}
-
 /* caller ensures gpio is valid and requested, chip->get_direction may sleep  */
 static int gpio_get_direction(unsigned gpio)
 {
@@ -254,13 +212,14 @@ static ssize_t gpio_direction_show(struct device *dev,
 
 	mutex_lock(&sysfs_lock);
 
-	if (!test_bit(FLAG_EXPORT, &desc->flags))
+	if (!test_bit(FLAG_EXPORT, &desc->flags)) {
 		status = -EIO;
-	else
+	} else {
 		gpio_get_direction(gpio);
 		status = sprintf(buf, "%s\n",
 			test_bit(FLAG_IS_OUT, &desc->flags)
 				? "out" : "in");
+	}
 
 	mutex_unlock(&sysfs_lock);
 	return status;

include/asm-generic/gpio.h

@@ -152,7 +152,6 @@ struct gpio_chip {
 extern const char *gpiochip_is_requested(struct gpio_chip *chip,
 			unsigned offset);
 extern struct gpio_chip *gpio_to_chip(unsigned gpio);
-extern int __must_check gpiochip_reserve(int start, int ngpio);
 
 /* add/remove chips */
 extern int gpiochip_add(struct gpio_chip *chip);
@@ -192,12 +191,6 @@ extern int gpio_request_one(unsigned gpio, unsigned long flags, const char *labe
 extern int gpio_request_array(const struct gpio *array, size_t num);
 extern void gpio_free_array(const struct gpio *array, size_t num);
 
-/* bindings for managed devices that want to request gpios */
-int devm_gpio_request(struct device *dev, unsigned gpio, const char *label);
-int devm_gpio_request_one(struct device *dev, unsigned gpio,
-			  unsigned long flags, const char *label);
-void devm_gpio_free(struct device *dev, unsigned int gpio);
-
 #ifdef CONFIG_GPIO_SYSFS
 
 /*
@@ -212,6 +205,43 @@ extern void gpio_unexport(unsigned gpio);
 
 #endif	/* CONFIG_GPIO_SYSFS */
 
+#ifdef CONFIG_PINCTRL
+
+/**
+ * struct gpio_pin_range - pin range controlled by a gpio chip
+ * @head: list for maintaining set of pin ranges, used internally
+ * @pctldev: pinctrl device which handles corresponding pins
+ * @range: actual range of pins controlled by a gpio controller
+ */
+
+struct gpio_pin_range {
+	struct list_head node;
+	struct pinctrl_dev *pctldev;
+	struct pinctrl_gpio_range range;
+};
+
+int gpiochip_add_pin_range(struct gpio_chip *chip, const char *pinctl_name,
+			   unsigned int gpio_offset, unsigned int pin_offset,
+			   unsigned int npins);
+void gpiochip_remove_pin_ranges(struct gpio_chip *chip);
+
+#else
+
+static inline int
+gpiochip_add_pin_range(struct gpio_chip *chip, const char *pinctl_name,
+		       unsigned int gpio_offset, unsigned int pin_offset,
+		       unsigned int npins)
+{
+	return 0;
+}
+
+static inline void
+gpiochip_remove_pin_ranges(struct gpio_chip *chip)
+{
+}
+
+#endif /* CONFIG_PINCTRL */
+
 #else	/* !CONFIG_GPIOLIB */
 
 static inline bool gpio_is_valid(int number)
@@ -270,41 +300,4 @@ static inline void gpio_unexport(unsigned gpio)
 }
 #endif	/* CONFIG_GPIO_SYSFS */
 
-#ifdef CONFIG_PINCTRL
-
-/**
- * struct gpio_pin_range - pin range controlled by a gpio chip
- * @head: list for maintaining set of pin ranges, used internally
- * @pctldev: pinctrl device which handles corresponding pins
- * @range: actual range of pins controlled by a gpio controller
- */
-
-struct gpio_pin_range {
-	struct list_head node;
-	struct pinctrl_dev *pctldev;
-	struct pinctrl_gpio_range range;
-};
-
-int gpiochip_add_pin_range(struct gpio_chip *chip, const char *pinctl_name,
-			   unsigned int gpio_offset, unsigned int pin_offset,
-			   unsigned int npins);
-void gpiochip_remove_pin_ranges(struct gpio_chip *chip);
-
-#else
-
-static inline int
-gpiochip_add_pin_range(struct gpio_chip *chip, const char *pinctl_name,
-		       unsigned int gpio_offset, unsigned int pin_offset,
-		       unsigned int npins)
-{
-	return 0;
-}
-
-static inline void
-gpiochip_remove_pin_ranges(struct gpio_chip *chip)
-{
-}
-
-#endif /* CONFIG_PINCTRL */
-
 #endif /* _ASM_GENERIC_GPIO_H */

include/linux/acpi_gpio.h

@@ -2,10 +2,12 @@
 #define _LINUX_ACPI_GPIO_H_
 
 #include <linux/errno.h>
+#include <linux/gpio.h>
 
 #ifdef CONFIG_GPIO_ACPI
 
 int acpi_get_gpio(char *path, int pin);
+void acpi_gpiochip_request_interrupts(struct gpio_chip *chip);
 
 #else /* CONFIG_GPIO_ACPI */
 
@@ -14,6 +16,8 @@ static inline int acpi_get_gpio(char *path, int pin)
 	return -ENODEV;
 }
 
+static inline void acpi_gpiochip_request_interrupts(struct gpio_chip *chip) { }
+
 #endif /* CONFIG_GPIO_ACPI */
 
 #endif /* _LINUX_ACPI_GPIO_H_ */

include/linux/gpio.h

@@ -94,24 +94,12 @@ static inline int gpio_request(unsigned gpio, const char *label)
 	return -ENOSYS;
 }
 
-static inline int devm_gpio_request(struct device *dev, unsigned gpio,
-				    const char *label)
-{
-	return -ENOSYS;
-}
-
 static inline int gpio_request_one(unsigned gpio,
 					unsigned long flags, const char *label)
 {
 	return -ENOSYS;
 }
 
-static inline int devm_gpio_request_one(struct device *dev, unsigned gpio,
-					unsigned long flags, const char *label)
-{
-	return -ENOSYS;
-}
-
 static inline int gpio_request_array(const struct gpio *array, size_t num)
 {
 	return -ENOSYS;
@@ -125,14 +113,6 @@ static inline void gpio_free(unsigned gpio)
 	WARN_ON(1);
 }
 
-static inline void devm_gpio_free(struct device *dev, unsigned gpio)
-{
-	might_sleep();
-
-	/* GPIO can never have been requested */
-	WARN_ON(1);
-}
-
 static inline void gpio_free_array(const struct gpio *array, size_t num)
 {
 	might_sleep();
@@ -248,4 +228,12 @@ gpiochip_remove_pin_ranges(struct gpio_chip *chip)
 
 #endif /* ! CONFIG_GENERIC_GPIO */
 
+struct device;
+
+/* bindings for managed devices that want to request gpios */
+int devm_gpio_request(struct device *dev, unsigned gpio, const char *label);
+int devm_gpio_request_one(struct device *dev, unsigned gpio,
+			  unsigned long flags, const char *label);
+void devm_gpio_free(struct device *dev, unsigned int gpio);
+
 #endif /* __LINUX_GPIO_H */