aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/gpio
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/gpio')
-rw-r--r--drivers/gpio/Kconfig18
-rw-r--r--drivers/gpio/Makefile2
-rw-r--r--drivers/gpio/gpiolib.c151
-rw-r--r--drivers/gpio/max730x.c22
-rw-r--r--drivers/gpio/pcf857x.c9
-rw-r--r--drivers/gpio/stmpe-gpio.c399
-rw-r--r--drivers/gpio/sx150x.c645
-rw-r--r--drivers/gpio/wm831x-gpio.c32
-rw-r--r--drivers/gpio/xilinx_gpio.c15
9 files changed, 1205 insertions, 88 deletions
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 7face915b963..510aa2054544 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -195,6 +195,24 @@ config GPIO_PCF857X
This driver provides an in-kernel interface to those GPIOs using
platform-neutral GPIO calls.
+config GPIO_SX150X
+ bool "Semtech SX150x I2C GPIO expander"
+ depends on I2C=y
+ default n
+ help
+ Say yes here to provide support for Semtech SX150-series I2C
+ GPIO expanders. Compatible models include:
+
+ 8 bits: sx1508q
+ 16 bits: sx1509q
+
+config GPIO_STMPE
+ bool "STMPE GPIOs"
+ depends on MFD_STMPE
+ help
+ This enables support for the GPIOs found on the STMPE I/O
+ Expanders.
+
config GPIO_TC35892
bool "TC35892 GPIOs"
depends on MFD_TC35892
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index e53dcff49b4f..fc6019d93720 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -20,6 +20,7 @@ obj-$(CONFIG_GPIO_MCP23S08) += mcp23s08.o
obj-$(CONFIG_GPIO_PCA953X) += pca953x.o
obj-$(CONFIG_GPIO_PCF857X) += pcf857x.o
obj-$(CONFIG_GPIO_PL061) += pl061.o
+obj-$(CONFIG_GPIO_STMPE) += stmpe-gpio.o
obj-$(CONFIG_GPIO_TC35892) += tc35892-gpio.o
obj-$(CONFIG_GPIO_TIMBERDALE) += timbgpio.o
obj-$(CONFIG_GPIO_TWL4030) += twl4030-gpio.o
@@ -35,3 +36,4 @@ obj-$(CONFIG_GPIO_WM8994) += wm8994-gpio.o
obj-$(CONFIG_GPIO_SCH) += sch_gpio.o
obj-$(CONFIG_GPIO_RDC321X) += rdc321x-gpio.o
obj-$(CONFIG_GPIO_JANZ_TTL) += janz-ttl.o
+obj-$(CONFIG_GPIO_SX150X) += sx150x.o
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 4e51fe3c1fc4..21da9c19a0cb 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -8,6 +8,7 @@
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#include <linux/gpio.h>
+#include <linux/of_gpio.h>
#include <linux/idr.h>
#include <linux/slab.h>
@@ -56,9 +57,9 @@ struct gpio_desc {
#define FLAG_TRIG_RISE 6 /* trigger on rising edge */
#define FLAG_ACTIVE_LOW 7 /* sysfs value has active low */
-#define PDESC_ID_SHIFT 16 /* add new flags before this one */
+#define ID_SHIFT 16 /* add new flags before this one */
-#define GPIO_FLAGS_MASK ((1 << PDESC_ID_SHIFT) - 1)
+#define GPIO_FLAGS_MASK ((1 << ID_SHIFT) - 1)
#define GPIO_TRIGGER_MASK (BIT(FLAG_TRIG_FALL) | BIT(FLAG_TRIG_RISE))
#ifdef CONFIG_DEBUG_FS
@@ -68,12 +69,7 @@ struct gpio_desc {
static struct gpio_desc gpio_desc[ARCH_NR_GPIOS];
#ifdef CONFIG_GPIO_SYSFS
-struct poll_desc {
- struct work_struct work;
- struct sysfs_dirent *value_sd;
-};
-
-static struct idr pdesc_idr;
+static DEFINE_IDR(dirent_idr);
#endif
static inline void desc_set_label(struct gpio_desc *d, const char *label)
@@ -324,24 +320,16 @@ static const DEVICE_ATTR(value, 0644,
static irqreturn_t gpio_sysfs_irq(int irq, void *priv)
{
- struct work_struct *work = priv;
+ struct sysfs_dirent *value_sd = priv;
- schedule_work(work);
+ sysfs_notify_dirent(value_sd);
return IRQ_HANDLED;
}
-static void gpio_notify_sysfs(struct work_struct *work)
-{
- struct poll_desc *pdesc;
-
- pdesc = container_of(work, struct poll_desc, work);
- sysfs_notify_dirent(pdesc->value_sd);
-}
-
static int gpio_setup_irq(struct gpio_desc *desc, struct device *dev,
unsigned long gpio_flags)
{
- struct poll_desc *pdesc;
+ struct sysfs_dirent *value_sd;
unsigned long irq_flags;
int ret, irq, id;
@@ -352,18 +340,16 @@ static int gpio_setup_irq(struct gpio_desc *desc, struct device *dev,
if (irq < 0)
return -EIO;
- id = desc->flags >> PDESC_ID_SHIFT;
- pdesc = idr_find(&pdesc_idr, id);
- if (pdesc) {
- free_irq(irq, &pdesc->work);
- cancel_work_sync(&pdesc->work);
- }
+ id = desc->flags >> ID_SHIFT;
+ value_sd = idr_find(&dirent_idr, id);
+ if (value_sd)
+ free_irq(irq, value_sd);
desc->flags &= ~GPIO_TRIGGER_MASK;
if (!gpio_flags) {
ret = 0;
- goto free_sd;
+ goto free_id;
}
irq_flags = IRQF_SHARED;
@@ -374,55 +360,46 @@ static int gpio_setup_irq(struct gpio_desc *desc, struct device *dev,
irq_flags |= test_bit(FLAG_ACTIVE_LOW, &desc->flags) ?
IRQF_TRIGGER_FALLING : IRQF_TRIGGER_RISING;
- if (!pdesc) {
- pdesc = kmalloc(sizeof(*pdesc), GFP_KERNEL);
- if (!pdesc) {
- ret = -ENOMEM;
+ if (!value_sd) {
+ value_sd = sysfs_get_dirent(dev->kobj.sd, NULL, "value");
+ if (!value_sd) {
+ ret = -ENODEV;
goto err_out;
}
do {
ret = -ENOMEM;
- if (idr_pre_get(&pdesc_idr, GFP_KERNEL))
- ret = idr_get_new_above(&pdesc_idr,
- pdesc, 1, &id);
+ if (idr_pre_get(&dirent_idr, GFP_KERNEL))
+ ret = idr_get_new_above(&dirent_idr, value_sd,
+ 1, &id);
} while (ret == -EAGAIN);
if (ret)
- goto free_mem;
+ goto free_sd;
desc->flags &= GPIO_FLAGS_MASK;
- desc->flags |= (unsigned long)id << PDESC_ID_SHIFT;
+ desc->flags |= (unsigned long)id << ID_SHIFT;
- if (desc->flags >> PDESC_ID_SHIFT != id) {
+ if (desc->flags >> ID_SHIFT != id) {
ret = -ERANGE;
goto free_id;
}
-
- pdesc->value_sd = sysfs_get_dirent(dev->kobj.sd, NULL, "value");
- if (!pdesc->value_sd) {
- ret = -ENODEV;
- goto free_id;
- }
- INIT_WORK(&pdesc->work, gpio_notify_sysfs);
}
- ret = request_irq(irq, gpio_sysfs_irq, irq_flags,
- "gpiolib", &pdesc->work);
- if (ret)
- goto free_sd;
+ ret = request_any_context_irq(irq, gpio_sysfs_irq, irq_flags,
+ "gpiolib", value_sd);
+ if (ret < 0)
+ goto free_id;
desc->flags |= gpio_flags;
return 0;
-free_sd:
- if (pdesc)
- sysfs_put(pdesc->value_sd);
free_id:
- idr_remove(&pdesc_idr, id);
+ idr_remove(&dirent_idr, id);
desc->flags &= GPIO_FLAGS_MASK;
-free_mem:
- kfree(pdesc);
+free_sd:
+ if (value_sd)
+ sysfs_put(value_sd);
err_out:
return ret;
}
@@ -993,8 +970,6 @@ static int __init gpiolib_sysfs_init(void)
unsigned long flags;
unsigned gpio;
- idr_init(&pdesc_idr);
-
status = class_register(&gpio_class);
if (status < 0)
return status;
@@ -1100,16 +1075,24 @@ int gpiochip_add(struct gpio_chip *chip)
}
}
+ of_gpiochip_add(chip);
+
unlock:
spin_unlock_irqrestore(&gpio_lock, flags);
- if (status == 0)
- status = gpiochip_export(chip);
+
+ if (status)
+ goto fail;
+
+ status = gpiochip_export(chip);
+ if (status)
+ goto fail;
+
+ return 0;
fail:
/* failures here can mean systems won't boot... */
- if (status)
- pr_err("gpiochip_add: gpios %d..%d (%s) failed to register\n",
- chip->base, chip->base + chip->ngpio - 1,
- chip->label ? : "generic");
+ pr_err("gpiochip_add: gpios %d..%d (%s) failed to register\n",
+ chip->base, chip->base + chip->ngpio - 1,
+ chip->label ? : "generic");
return status;
}
EXPORT_SYMBOL_GPL(gpiochip_add);
@@ -1128,6 +1111,8 @@ int gpiochip_remove(struct gpio_chip *chip)
spin_lock_irqsave(&gpio_lock, flags);
+ of_gpiochip_remove(chip);
+
for (id = chip->base; id < chip->base + chip->ngpio; id++) {
if (test_bit(FLAG_REQUESTED, &gpio_desc[id].flags)) {
status = -EBUSY;
@@ -1148,6 +1133,38 @@ int gpiochip_remove(struct gpio_chip *chip)
}
EXPORT_SYMBOL_GPL(gpiochip_remove);
+/**
+ * gpiochip_find() - iterator for locating a specific gpio_chip
+ * @data: data to pass to match function
+ * @callback: Callback function to check gpio_chip
+ *
+ * Similar to bus_find_device. It returns a reference to a gpio_chip as
+ * determined by a user supplied @match callback. The callback should return
+ * 0 if the device doesn't match and non-zero if it does. If the callback is
+ * non-zero, this function will return to the caller and not iterate over any
+ * more gpio_chips.
+ */
+struct gpio_chip *gpiochip_find(void *data,
+ int (*match)(struct gpio_chip *chip, void *data))
+{
+ struct gpio_chip *chip = NULL;
+ unsigned long flags;
+ int i;
+
+ spin_lock_irqsave(&gpio_lock, flags);
+ for (i = 0; i < ARCH_NR_GPIOS; i++) {
+ if (!gpio_desc[i].chip)
+ continue;
+
+ if (match(gpio_desc[i].chip, data)) {
+ chip = gpio_desc[i].chip;
+ break;
+ }
+ }
+ spin_unlock_irqrestore(&gpio_lock, flags);
+
+ return chip;
+}
/* These "optional" allocation calls help prevent drivers from stomping
* on each other, and help provide better diagnostics in debugfs.
@@ -1229,7 +1246,7 @@ void gpio_free(unsigned gpio)
if (chip && test_bit(FLAG_REQUESTED, &desc->flags)) {
if (chip->free) {
spin_unlock_irqrestore(&gpio_lock, flags);
- might_sleep_if(extra_checks && chip->can_sleep);
+ might_sleep_if(chip->can_sleep);
chip->free(chip, gpio - chip->base);
spin_lock_irqsave(&gpio_lock, flags);
}
@@ -1367,7 +1384,7 @@ int gpio_direction_input(unsigned gpio)
spin_unlock_irqrestore(&gpio_lock, flags);
- might_sleep_if(extra_checks && chip->can_sleep);
+ might_sleep_if(chip->can_sleep);
if (status) {
status = chip->request(chip, gpio);
@@ -1420,7 +1437,7 @@ int gpio_direction_output(unsigned gpio, int value)
spin_unlock_irqrestore(&gpio_lock, flags);
- might_sleep_if(extra_checks && chip->can_sleep);
+ might_sleep_if(chip->can_sleep);
if (status) {
status = chip->request(chip, gpio);
@@ -1478,7 +1495,7 @@ int gpio_set_debounce(unsigned gpio, unsigned debounce)
spin_unlock_irqrestore(&gpio_lock, flags);
- might_sleep_if(extra_checks && chip->can_sleep);
+ might_sleep_if(chip->can_sleep);
return chip->set_debounce(chip, gpio, debounce);
@@ -1528,7 +1545,7 @@ int __gpio_get_value(unsigned gpio)
struct gpio_chip *chip;
chip = gpio_to_chip(gpio);
- WARN_ON(extra_checks && chip->can_sleep);
+ WARN_ON(chip->can_sleep);
return chip->get ? chip->get(chip, gpio - chip->base) : 0;
}
EXPORT_SYMBOL_GPL(__gpio_get_value);
@@ -1547,7 +1564,7 @@ void __gpio_set_value(unsigned gpio, int value)
struct gpio_chip *chip;
chip = gpio_to_chip(gpio);
- WARN_ON(extra_checks && chip->can_sleep);
+ WARN_ON(chip->can_sleep);
chip->set(chip, gpio - chip->base, value);
}
EXPORT_SYMBOL_GPL(__gpio_set_value);
diff --git a/drivers/gpio/max730x.c b/drivers/gpio/max730x.c
index 7696a5625d58..94ce773f95f8 100644
--- a/drivers/gpio/max730x.c
+++ b/drivers/gpio/max730x.c
@@ -54,7 +54,7 @@ static int max7301_direction_input(struct gpio_chip *chip, unsigned offset)
{
struct max7301 *ts = container_of(chip, struct max7301, chip);
u8 *config;
- u8 offset_bits;
+ u8 offset_bits, pin_config;
int ret;
/* First 4 pins are unused in the controller */
@@ -63,12 +63,15 @@ static int max7301_direction_input(struct gpio_chip *chip, unsigned offset)
config = &ts->port_config[offset >> 2];
+ if (ts->input_pullup_active & BIT(offset))
+ pin_config = PIN_CONFIG_IN_PULLUP;
+ else
+ pin_config = PIN_CONFIG_IN_WO_PULLUP;
+
mutex_lock(&ts->lock);
- /* Standard GPIO API doesn't support pull-ups, has to be extended.
- * Hard-coding no pollup for now. */
*config = (*config & ~(PIN_CONFIG_MASK << offset_bits))
- | (PIN_CONFIG_IN_WO_PULLUP << offset_bits);
+ | (pin_config << offset_bits);
ret = ts->write(ts->dev, 0x08 + (offset >> 2), *config);
@@ -177,6 +180,7 @@ int __devinit __max730x_probe(struct max7301 *ts)
/* Power up the chip and disable IRQ output */
ts->write(dev, 0x04, 0x01);
+ ts->input_pullup_active = pdata->input_pullup_active;
ts->chip.label = dev->driver->name;
ts->chip.direction_input = max7301_direction_input;
@@ -191,13 +195,17 @@ int __devinit __max730x_probe(struct max7301 *ts)
ts->chip.owner = THIS_MODULE;
/*
- * tristate all pins in hardware and cache the
+ * initialize pullups according to platform data and cache the
* register values for later use.
*/
for (i = 1; i < 8; i++) {
int j;
- /* 0xAA means input with internal pullup disabled */
- ts->write(dev, 0x08 + i, 0xAA);
+ /*
+ * initialize port_config with "0xAA", which means
+ * input with internal pullup disabled. This is needed
+ * to avoid writing zeros (in the inner for loop),
+ * which is not allowed according to the datasheet.
+ */
ts->port_config[i] = 0xAA;
for (j = 0; j < 4; j++) {
int offset = (i - 1) * 4 + j;
diff --git a/drivers/gpio/pcf857x.c b/drivers/gpio/pcf857x.c
index 29f19ce3e80f..879b473aab5a 100644
--- a/drivers/gpio/pcf857x.c
+++ b/drivers/gpio/pcf857x.c
@@ -190,7 +190,6 @@ static int pcf857x_probe(struct i2c_client *client,
pdata = client->dev.platform_data;
if (!pdata) {
dev_dbg(&client->dev, "no platform data\n");
- return -EINVAL;
}
/* Allocate, initialize, and register this gpio_chip. */
@@ -200,7 +199,7 @@ static int pcf857x_probe(struct i2c_client *client,
mutex_init(&gpio->lock);
- gpio->chip.base = pdata->gpio_base;
+ gpio->chip.base = pdata ? pdata->gpio_base : -1;
gpio->chip.can_sleep = 1;
gpio->chip.dev = &client->dev;
gpio->chip.owner = THIS_MODULE;
@@ -278,7 +277,7 @@ static int pcf857x_probe(struct i2c_client *client,
* to zero, our software copy of the "latch" then matches the chip's
* all-ones reset state. Otherwise it flags pins to be driven low.
*/
- gpio->out = ~pdata->n_latch;
+ gpio->out = pdata ? ~pdata->n_latch : ~0;
status = gpiochip_add(&gpio->chip);
if (status < 0)
@@ -299,7 +298,7 @@ static int pcf857x_probe(struct i2c_client *client,
/* Let platform code set up the GPIOs and their users.
* Now is the first time anyone could use them.
*/
- if (pdata->setup) {
+ if (pdata && pdata->setup) {
status = pdata->setup(client,
gpio->chip.base, gpio->chip.ngpio,
pdata->context);
@@ -322,7 +321,7 @@ static int pcf857x_remove(struct i2c_client *client)
struct pcf857x *gpio = i2c_get_clientdata(client);
int status = 0;
- if (pdata->teardown) {
+ if (pdata && pdata->teardown) {
status = pdata->teardown(client,
gpio->chip.base, gpio->chip.ngpio,
pdata->context);
diff --git a/drivers/gpio/stmpe-gpio.c b/drivers/gpio/stmpe-gpio.c
new file mode 100644
index 000000000000..4e1f1b9d5e67
--- /dev/null
+++ b/drivers/gpio/stmpe-gpio.c
@@ -0,0 +1,399 @@
+/*
+ * Copyright (C) ST-Ericsson SA 2010
+ *
+ * License Terms: GNU General Public License, version 2
+ * Author: Rabin Vincent <rabin.vincent@stericsson.com> for ST-Ericsson
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/gpio.h>
+#include <linux/irq.h>
+#include <linux/interrupt.h>
+#include <linux/mfd/stmpe.h>
+
+/*
+ * These registers are modified under the irq bus lock and cached to avoid
+ * unnecessary writes in bus_sync_unlock.
+ */
+enum { REG_RE, REG_FE, REG_IE };
+
+#define CACHE_NR_REGS 3
+#define CACHE_NR_BANKS (STMPE_NR_GPIOS / 8)
+
+struct stmpe_gpio {
+ struct gpio_chip chip;
+ struct stmpe *stmpe;
+ struct device *dev;
+ struct mutex irq_lock;
+
+ int irq_base;
+
+ /* Caches of interrupt control registers for bus_lock */
+ u8 regs[CACHE_NR_REGS][CACHE_NR_BANKS];
+ u8 oldregs[CACHE_NR_REGS][CACHE_NR_BANKS];
+};
+
+static inline struct stmpe_gpio *to_stmpe_gpio(struct gpio_chip *chip)
+{
+ return container_of(chip, struct stmpe_gpio, chip);
+}
+
+static int stmpe_gpio_get(struct gpio_chip *chip, unsigned offset)
+{
+ struct stmpe_gpio *stmpe_gpio = to_stmpe_gpio(chip);
+ struct stmpe *stmpe = stmpe_gpio->stmpe;
+ u8 reg = stmpe->regs[STMPE_IDX_GPMR_LSB] - (offset / 8);
+ u8 mask = 1 << (offset % 8);
+ int ret;
+
+ ret = stmpe_reg_read(stmpe, reg);
+ if (ret < 0)
+ return ret;
+
+ return ret & mask;
+}
+
+static void stmpe_gpio_set(struct gpio_chip *chip, unsigned offset, int val)
+{
+ struct stmpe_gpio *stmpe_gpio = to_stmpe_gpio(chip);
+ struct stmpe *stmpe = stmpe_gpio->stmpe;
+ int which = val ? STMPE_IDX_GPSR_LSB : STMPE_IDX_GPCR_LSB;
+ u8 reg = stmpe->regs[which] - (offset / 8);
+ u8 mask = 1 << (offset % 8);
+
+ stmpe_reg_write(stmpe, reg, mask);
+}
+
+static int stmpe_gpio_direction_output(struct gpio_chip *chip,
+ unsigned offset, int val)
+{
+ struct stmpe_gpio *stmpe_gpio = to_stmpe_gpio(chip);
+ struct stmpe *stmpe = stmpe_gpio->stmpe;
+ u8 reg = stmpe->regs[STMPE_IDX_GPDR_LSB] - (offset / 8);
+ u8 mask = 1 << (offset % 8);
+
+ stmpe_gpio_set(chip, offset, val);
+
+ return stmpe_set_bits(stmpe, reg, mask, mask);
+}
+
+static int stmpe_gpio_direction_input(struct gpio_chip *chip,
+ unsigned offset)
+{
+ struct stmpe_gpio *stmpe_gpio = to_stmpe_gpio(chip);
+ struct stmpe *stmpe = stmpe_gpio->stmpe;
+ u8 reg = stmpe->regs[STMPE_IDX_GPDR_LSB] - (offset / 8);
+ u8 mask = 1 << (offset % 8);
+
+ return stmpe_set_bits(stmpe, reg, mask, 0);
+}
+
+static int stmpe_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
+{
+ struct stmpe_gpio *stmpe_gpio = to_stmpe_gpio(chip);
+
+ return stmpe_gpio->irq_base + offset;
+}
+
+static int stmpe_gpio_request(struct gpio_chip *chip, unsigned offset)
+{
+ struct stmpe_gpio *stmpe_gpio = to_stmpe_gpio(chip);
+ struct stmpe *stmpe = stmpe_gpio->stmpe;
+
+ return stmpe_set_altfunc(stmpe, 1 << offset, STMPE_BLOCK_GPIO);
+}
+
+static struct gpio_chip template_chip = {
+ .label = "stmpe",
+ .owner = THIS_MODULE,
+ .direction_input = stmpe_gpio_direction_input,
+ .get = stmpe_gpio_get,
+ .direction_output = stmpe_gpio_direction_output,
+ .set = stmpe_gpio_set,
+ .to_irq = stmpe_gpio_to_irq,
+ .request = stmpe_gpio_request,
+ .can_sleep = 1,
+};
+
+static int stmpe_gpio_irq_set_type(unsigned int irq, unsigned int type)
+{
+ struct stmpe_gpio *stmpe_gpio = get_irq_chip_data(irq);
+ int offset = irq - stmpe_gpio->irq_base;
+ int regoffset = offset / 8;
+ int mask = 1 << (offset % 8);
+
+ if (type == IRQ_TYPE_LEVEL_LOW || type == IRQ_TYPE_LEVEL_HIGH)
+ return -EINVAL;
+
+ if (type == IRQ_TYPE_EDGE_RISING)
+ stmpe_gpio->regs[REG_RE][regoffset] |= mask;
+ else
+ stmpe_gpio->regs[REG_RE][regoffset] &= ~mask;
+
+ if (type == IRQ_TYPE_EDGE_FALLING)
+ stmpe_gpio->regs[REG_FE][regoffset] |= mask;
+ else
+ stmpe_gpio->regs[REG_FE][regoffset] &= ~mask;
+
+ return 0;
+}
+
+static void stmpe_gpio_irq_lock(unsigned int irq)
+{
+ struct stmpe_gpio *stmpe_gpio = get_irq_chip_data(irq);
+
+ mutex_lock(&stmpe_gpio->irq_lock);
+}
+
+static void stmpe_gpio_irq_sync_unlock(unsigned int irq)
+{
+ struct stmpe_gpio *stmpe_gpio = get_irq_chip_data(irq);
+ struct stmpe *stmpe = stmpe_gpio->stmpe;
+ int num_banks = DIV_ROUND_UP(stmpe->num_gpios, 8);
+ static const u8 regmap[] = {
+ [REG_RE] = STMPE_IDX_GPRER_LSB,
+ [REG_FE] = STMPE_IDX_GPFER_LSB,
+ [REG_IE] = STMPE_IDX_IEGPIOR_LSB,
+ };
+ int i, j;
+
+ for (i = 0; i < CACHE_NR_REGS; i++) {
+ for (j = 0; j < num_banks; j++) {
+ u8 old = stmpe_gpio->oldregs[i][j];
+ u8 new = stmpe_gpio->regs[i][j];
+
+ if (new == old)
+ continue;
+
+ stmpe_gpio->oldregs[i][j] = new;
+ stmpe_reg_write(stmpe, stmpe->regs[regmap[i]] - j, new);
+ }
+ }
+
+ mutex_unlock(&stmpe_gpio->irq_lock);
+}
+
+static void stmpe_gpio_irq_mask(unsigned int irq)
+{
+ struct stmpe_gpio *stmpe_gpio = get_irq_chip_data(irq);
+ int offset = irq - stmpe_gpio->irq_base;
+ int regoffset = offset / 8;
+ int mask = 1 << (offset % 8);
+
+ stmpe_gpio->regs[REG_IE][regoffset] &= ~mask;
+}
+
+static void stmpe_gpio_irq_unmask(unsigned int irq)
+{
+ struct stmpe_gpio *stmpe_gpio = get_irq_chip_data(irq);
+ int offset = irq - stmpe_gpio->irq_base;
+ int regoffset = offset / 8;
+ int mask = 1 << (offset % 8);
+
+ stmpe_gpio->regs[REG_IE][regoffset] |= mask;
+}
+
+static struct irq_chip stmpe_gpio_irq_chip = {
+ .name = "stmpe-gpio",
+ .bus_lock = stmpe_gpio_irq_lock,
+ .bus_sync_unlock = stmpe_gpio_irq_sync_unlock,
+ .mask = stmpe_gpio_irq_mask,
+ .unmask = stmpe_gpio_irq_unmask,
+ .set_type = stmpe_gpio_irq_set_type,
+};
+
+static irqreturn_t stmpe_gpio_irq(int irq, void *dev)
+{
+ struct stmpe_gpio *stmpe_gpio = dev;
+ struct stmpe *stmpe = stmpe_gpio->stmpe;
+ u8 statmsbreg = stmpe->regs[STMPE_IDX_ISGPIOR_MSB];
+ int num_banks = DIV_ROUND_UP(stmpe->num_gpios, 8);
+ u8 status[num_banks];
+ int ret;
+ int i;
+
+ ret = stmpe_block_read(stmpe, statmsbreg, num_banks, status);
+ if (ret < 0)
+ return IRQ_NONE;
+
+ for (i = 0; i < num_banks; i++) {
+ int bank = num_banks - i - 1;
+ unsigned int enabled = stmpe_gpio->regs[REG_IE][bank];
+ unsigned int stat = status[i];
+
+ stat &= enabled;
+ if (!stat)
+ continue;
+
+ while (stat) {
+ int bit = __ffs(stat);
+ int line = bank * 8 + bit;
+
+ handle_nested_irq(stmpe_gpio->irq_base + line);
+ stat &= ~(1 << bit);
+ }
+
+ stmpe_reg_write(stmpe, statmsbreg + i, status[i]);
+ stmpe_reg_write(stmpe, stmpe->regs[STMPE_IDX_GPEDR_MSB] + i,
+ status[i]);
+ }
+
+ return IRQ_HANDLED;
+}
+
+static int __devinit stmpe_gpio_irq_init(struct stmpe_gpio *stmpe_gpio)
+{
+ int base = stmpe_gpio->irq_base;
+ int irq;
+
+ for (irq = base; irq < base + stmpe_gpio->chip.ngpio; irq++) {
+ set_irq_chip_data(irq, stmpe_gpio);
+ set_irq_chip_and_handler(irq, &stmpe_gpio_irq_chip,
+ handle_simple_irq);
+ set_irq_nested_thread(irq, 1);
+#ifdef CONFIG_ARM
+ set_irq_flags(irq, IRQF_VALID);
+#else
+ set_irq_noprobe(irq);
+#endif
+ }
+
+ return 0;
+}
+
+static void stmpe_gpio_irq_remove(struct stmpe_gpio *stmpe_gpio)
+{
+ int base = stmpe_gpio->irq_base;
+ int irq;
+
+ for (irq = base; irq < base + stmpe_gpio->chip.ngpio; irq++) {
+#ifdef CONFIG_ARM
+ set_irq_flags(irq, 0);
+#endif
+ set_irq_chip_and_handler(irq, NULL, NULL);
+ set_irq_chip_data(irq, NULL);
+ }
+}
+
+static int __devinit stmpe_gpio_probe(struct platform_device *pdev)
+{
+ struct stmpe *stmpe = dev_get_drvdata(pdev->dev.parent);
+ struct stmpe_gpio_platform_data *pdata;
+ struct stmpe_gpio *stmpe_gpio;
+ int ret;
+ int irq;
+
+ pdata = stmpe->pdata->gpio;
+ if (!pdata)
+ return -ENODEV;
+
+ irq = platform_get_irq(pdev, 0);
+ if (irq < 0)
+ return irq;
+
+ stmpe_gpio = kzalloc(sizeof(struct stmpe_gpio), GFP_KERNEL);
+ if (!stmpe_gpio)
+ return -ENOMEM;
+
+ mutex_init(&stmpe_gpio->irq_lock);
+
+ stmpe_gpio->dev = &pdev->dev;
+ stmpe_gpio->stmpe = stmpe;
+
+ stmpe_gpio->chip = template_chip;
+ stmpe_gpio->chip.ngpio = stmpe->num_gpios;
+ stmpe_gpio->chip.dev = &pdev->dev;
+ stmpe_gpio->chip.base = pdata ? pdata->gpio_base : -1;
+
+ stmpe_gpio->irq_base = stmpe->irq_base + STMPE_INT_GPIO(0);
+
+ ret = stmpe_enable(stmpe, STMPE_BLOCK_GPIO);
+ if (ret)
+ return ret;
+
+ ret = stmpe_gpio_irq_init(stmpe_gpio);
+ if (ret)
+ goto out_free;
+
+ ret = request_threaded_irq(irq, NULL, stmpe_gpio_irq, IRQF_ONESHOT,
+ "stmpe-gpio", stmpe_gpio);
+ if (ret) {
+ dev_err(&pdev->dev, "unable to get irq: %d\n", ret);
+ goto out_removeirq;
+ }
+
+ ret = gpiochip_add(&stmpe_gpio->chip);
+ if (ret) {
+ dev_err(&pdev->dev, "unable to add gpiochip: %d\n", ret);
+ goto out_freeirq;
+ }
+
+ if (pdata && pdata->setup)
+ pdata->setup(stmpe, stmpe_gpio->chip.base);
+
+ platform_set_drvdata(pdev, stmpe_gpio);
+
+ return 0;
+
+out_freeirq:
+ free_irq(irq, stmpe_gpio);
+out_removeirq:
+ stmpe_gpio_irq_remove(stmpe_gpio);
+out_free:
+ kfree(stmpe_gpio);
+ return ret;
+}
+
+static int __devexit stmpe_gpio_remove(struct platform_device *pdev)
+{
+ struct stmpe_gpio *stmpe_gpio = platform_get_drvdata(pdev);
+ struct stmpe *stmpe = stmpe_gpio->stmpe;
+ struct stmpe_gpio_platform_data *pdata = stmpe->pdata->gpio;
+ int irq = platform_get_irq(pdev, 0);
+ int ret;
+
+ if (pdata && pdata->remove)
+ pdata->remove(stmpe, stmpe_gpio->chip.base);
+
+ ret = gpiochip_remove(&stmpe_gpio->chip);
+ if (ret < 0) {
+ dev_err(stmpe_gpio->dev,
+ "unable to remove gpiochip: %d\n", ret);
+ return ret;
+ }
+
+ stmpe_disable(stmpe, STMPE_BLOCK_GPIO);
+
+ free_irq(irq, stmpe_gpio);
+ stmpe_gpio_irq_remove(stmpe_gpio);
+ platform_set_drvdata(pdev, NULL);
+ kfree(stmpe_gpio);
+
+ return 0;
+}
+
+static struct platform_driver stmpe_gpio_driver = {
+ .driver.name = "stmpe-gpio",
+ .driver.owner = THIS_MODULE,
+ .probe = stmpe_gpio_probe,
+ .remove = __devexit_p(stmpe_gpio_remove),
+};
+
+static int __init stmpe_gpio_init(void)
+{
+ return platform_driver_register(&stmpe_gpio_driver);
+}
+subsys_initcall(stmpe_gpio_init);
+
+static void __exit stmpe_gpio_exit(void)
+{
+ platform_driver_unregister(&stmpe_gpio_driver);
+}
+module_exit(stmpe_gpio_exit);
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("STMPExxxx GPIO driver");
+MODULE_AUTHOR("Rabin Vincent <rabin.vincent@stericsson.com>");
diff --git a/drivers/gpio/sx150x.c b/drivers/gpio/sx150x.c
new file mode 100644
index 000000000000..b42f42ca70c3
--- /dev/null
+++ b/drivers/gpio/sx150x.c
@@ -0,0 +1,645 @@
+/* Copyright (c) 2010, Code Aurora Forum. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+#include <linux/gpio.h>
+#include <linux/i2c.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/slab.h>
+#include <linux/workqueue.h>
+#include <linux/i2c/sx150x.h>
+
+struct sx150x_device_data {
+ u8 reg_pullup;
+ u8 reg_pulldn;
+ u8 reg_drain;
+ u8 reg_polarity;
+ u8 reg_dir;
+ u8 reg_data;
+ u8 reg_irq_mask;
+ u8 reg_irq_src;
+ u8 reg_sense;
+ u8 reg_clock;
+ u8 reg_misc;
+ u8 reg_reset;
+ u8 ngpios;
+};
+
+struct sx150x_chip {
+ struct gpio_chip gpio_chip;
+ struct i2c_client *client;
+ const struct sx150x_device_data *dev_cfg;
+ int irq_summary;
+ int irq_base;
+ u32 irq_sense;
+ unsigned long irq_set_type_pending;
+ struct irq_chip irq_chip;
+ struct mutex lock;
+};
+
+static const struct sx150x_device_data sx150x_devices[] = {
+ [0] = { /* sx1508q */
+ .reg_pullup = 0x03,
+ .reg_pulldn = 0x04,
+ .reg_drain = 0x05,
+ .reg_polarity = 0x06,
+ .reg_dir = 0x07,
+ .reg_data = 0x08,
+ .reg_irq_mask = 0x09,
+ .reg_irq_src = 0x0c,
+ .reg_sense = 0x0b,
+ .reg_clock = 0x0f,
+ .reg_misc = 0x10,
+ .reg_reset = 0x7d,
+ .ngpios = 8
+ },
+ [1] = { /* sx1509q */
+ .reg_pullup = 0x07,
+ .reg_pulldn = 0x09,
+ .reg_drain = 0x0b,
+ .reg_polarity = 0x0d,
+ .reg_dir = 0x0f,
+ .reg_data = 0x11,
+ .reg_irq_mask = 0x13,
+ .reg_irq_src = 0x19,
+ .reg_sense = 0x17,
+ .reg_clock = 0x1e,
+ .reg_misc = 0x1f,
+ .reg_reset = 0x7d,
+ .ngpios = 16
+ },
+};
+
+static const struct i2c_device_id sx150x_id[] = {
+ {"sx1508q", 0},
+ {"sx1509q", 1},
+ {}
+};
+MODULE_DEVICE_TABLE(i2c, sx150x_id);
+
+static s32 sx150x_i2c_write(struct i2c_client *client, u8 reg, u8 val)
+{
+ s32 err = i2c_smbus_write_byte_data(client, reg, val);
+
+ if (err < 0)
+ dev_warn(&client->dev,
+ "i2c write fail: can't write %02x to %02x: %d\n",
+ val, reg, err);
+ return err;
+}
+
+static s32 sx150x_i2c_read(struct i2c_client *client, u8 reg, u8 *val)
+{
+ s32 err = i2c_smbus_read_byte_data(client, reg);
+
+ if (err >= 0)
+ *val = err;
+ else
+ dev_warn(&client->dev,
+ "i2c read fail: can't read from %02x: %d\n",
+ reg, err);
+ return err;
+}
+
+static inline bool offset_is_oscio(struct sx150x_chip *chip, unsigned offset)
+{
+ return (chip->dev_cfg->ngpios == offset);
+}
+
+/*
+ * These utility functions solve the common problem of locating and setting
+ * configuration bits. Configuration bits are grouped into registers
+ * whose indexes increase downwards. For example, with eight-bit registers,
+ * sixteen gpios would have their config bits grouped in the following order:
+ * REGISTER N-1 [ f e d c b a 9 8 ]
+ * N [ 7 6 5 4 3 2 1 0 ]
+ *
+ * For multi-bit configurations, the pattern gets wider:
+ * REGISTER N-3 [ f f e e d d c c ]
+ * N-2 [ b b a a 9 9 8 8 ]
+ * N-1 [ 7 7 6 6 5 5 4 4 ]
+ * N [ 3 3 2 2 1 1 0 0 ]
+ *
+ * Given the address of the starting register 'N', the index of the gpio
+ * whose configuration we seek to change, and the width in bits of that
+ * configuration, these functions allow us to locate the correct
+ * register and mask the correct bits.
+ */
+static inline void sx150x_find_cfg(u8 offset, u8 width,
+ u8 *reg, u8 *mask, u8 *shift)
+{
+ *reg -= offset * width / 8;
+ *mask = (1 << width) - 1;
+ *shift = (offset * width) % 8;
+ *mask <<= *shift;
+}
+
+static s32 sx150x_write_cfg(struct sx150x_chip *chip,
+ u8 offset, u8 width, u8 reg, u8 val)
+{
+ u8 mask;
+ u8 data;
+ u8 shift;
+ s32 err;
+
+ sx150x_find_cfg(offset, width, &reg, &mask, &shift);
+ err = sx150x_i2c_read(chip->client, reg, &data);
+ if (err < 0)
+ return err;
+
+ data &= ~mask;
+ data |= (val << shift) & mask;
+ return sx150x_i2c_write(chip->client, reg, data);
+}
+
+static int sx150x_get_io(struct sx150x_chip *chip, unsigned offset)
+{
+ u8 reg = chip->dev_cfg->reg_data;
+ u8 mask;
+ u8 data;
+ u8 shift;
+ s32 err;
+
+ sx150x_find_cfg(offset, 1, &reg, &mask, &shift);
+ err = sx150x_i2c_read(chip->client, reg, &data);
+ if (err >= 0)
+ err = (data & mask) != 0 ? 1 : 0;
+
+ return err;
+}
+
+static void sx150x_set_oscio(struct sx150x_chip *chip, int val)
+{
+ sx150x_i2c_write(chip->client,
+ chip->dev_cfg->reg_clock,
+ (val ? 0x1f : 0x10));
+}
+
+static void sx150x_set_io(struct sx150x_chip *chip, unsigned offset, int val)
+{
+ sx150x_write_cfg(chip,
+ offset,
+ 1,
+ chip->dev_cfg->reg_data,
+ (val ? 1 : 0));
+}
+
+static int sx150x_io_input(struct sx150x_chip *chip, unsigned offset)
+{
+ return sx150x_write_cfg(chip,
+ offset,
+ 1,
+ chip->dev_cfg->reg_dir,
+ 1);
+}
+
+static int sx150x_io_output(struct sx150x_chip *chip, unsigned offset, int val)
+{
+ int err;
+
+ err = sx150x_write_cfg(chip,
+ offset,
+ 1,
+ chip->dev_cfg->reg_data,
+ (val ? 1 : 0));
+ if (err >= 0)
+ err = sx150x_write_cfg(chip,
+ offset,
+ 1,
+ chip->dev_cfg->reg_dir,
+ 0);
+ return err;
+}
+
+static int sx150x_gpio_get(struct gpio_chip *gc, unsigned offset)
+{
+ struct sx150x_chip *chip;
+ int status = -EINVAL;
+
+ chip = container_of(gc, struct sx150x_chip, gpio_chip);
+
+ if (!offset_is_oscio(chip, offset)) {
+ mutex_lock(&chip->lock);
+ status = sx150x_get_io(chip, offset);
+ mutex_unlock(&chip->lock);
+ }
+
+ return status;
+}
+
+static void sx150x_gpio_set(struct gpio_chip *gc, unsigned offset, int val)
+{
+ struct sx150x_chip *chip;
+
+ chip = container_of(gc, struct sx150x_chip, gpio_chip);
+
+ mutex_lock(&chip->lock);
+ if (offset_is_oscio(chip, offset))
+ sx150x_set_oscio(chip, val);
+ else
+ sx150x_set_io(chip, offset, val);
+ mutex_unlock(&chip->lock);
+}
+
+static int sx150x_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
+{
+ struct sx150x_chip *chip;
+ int status = -EINVAL;
+
+ chip = container_of(gc, struct sx150x_chip, gpio_chip);
+
+ if (!offset_is_oscio(chip, offset)) {
+ mutex_lock(&chip->lock);
+ status = sx150x_io_input(chip, offset);
+ mutex_unlock(&chip->lock);
+ }
+ return status;
+}
+
+static int sx150x_gpio_direction_output(struct gpio_chip *gc,
+ unsigned offset,
+ int val)
+{
+ struct sx150x_chip *chip;
+ int status = 0;
+
+ chip = container_of(gc, struct sx150x_chip, gpio_chip);
+
+ if (!offset_is_oscio(chip, offset)) {
+ mutex_lock(&chip->lock);
+ status = sx150x_io_output(chip, offset, val);
+ mutex_unlock(&chip->lock);
+ }
+ return status;
+}
+
+static int sx150x_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
+{
+ struct sx150x_chip *chip;
+
+ chip = container_of(gc, struct sx150x_chip, gpio_chip);
+
+ if (offset >= chip->dev_cfg->ngpios)
+ return -EINVAL;
+
+ if (chip->irq_base < 0)
+ return -EINVAL;
+
+ return chip->irq_base + offset;
+}
+
+static void sx150x_irq_mask(unsigned int irq)
+{
+ struct irq_chip *ic = get_irq_chip(irq);
+ struct sx150x_chip *chip;
+ unsigned n;
+
+ chip = container_of(ic, struct sx150x_chip, irq_chip);
+ n = irq - chip->irq_base;
+
+ sx150x_write_cfg(chip, n, 1, chip->dev_cfg->reg_irq_mask, 1);
+ sx150x_write_cfg(chip, n, 2, chip->dev_cfg->reg_sense, 0);
+}
+
+static void sx150x_irq_unmask(unsigned int irq)
+{
+ struct irq_chip *ic = get_irq_chip(irq);
+ struct sx150x_chip *chip;
+ unsigned n;
+
+ chip = container_of(ic, struct sx150x_chip, irq_chip);
+ n = irq - chip->irq_base;
+
+ sx150x_write_cfg(chip, n, 1, chip->dev_cfg->reg_irq_mask, 0);
+ sx150x_write_cfg(chip, n, 2, chip->dev_cfg->reg_sense,
+ chip->irq_sense >> (n * 2));
+}
+
+static int sx150x_irq_set_type(unsigned int irq, unsigned int flow_type)
+{
+ struct irq_chip *ic = get_irq_chip(irq);
+ struct sx150x_chip *chip;
+ unsigned n, val = 0;
+
+ if (flow_type & (IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW))
+ return -EINVAL;
+
+ chip = container_of(ic, struct sx150x_chip, irq_chip);
+ n = irq - chip->irq_base;
+
+ if (flow_type & IRQ_TYPE_EDGE_RISING)
+ val |= 0x1;
+ if (flow_type & IRQ_TYPE_EDGE_FALLING)
+ val |= 0x2;
+
+ chip->irq_sense &= ~(3UL << (n * 2));
+ chip->irq_sense |= val << (n * 2);
+ chip->irq_set_type_pending |= BIT(n);
+ return 0;
+}
+
+static irqreturn_t sx150x_irq_thread_fn(int irq, void *dev_id)
+{
+ struct sx150x_chip *chip = (struct sx150x_chip *)dev_id;
+ unsigned nhandled = 0;
+ unsigned sub_irq;
+ unsigned n;
+ s32 err;
+ u8 val;
+ int i;
+
+ for (i = (chip->dev_cfg->ngpios / 8) - 1; i >= 0; --i) {
+ err = sx150x_i2c_read(chip->client,
+ chip->dev_cfg->reg_irq_src - i,
+ &val);
+ if (err < 0)
+ continue;
+
+ sx150x_i2c_write(chip->client,
+ chip->dev_cfg->reg_irq_src - i,
+ val);
+ for (n = 0; n < 8; ++n) {
+ if (val & (1 << n)) {
+ sub_irq = chip->irq_base + (i * 8) + n;
+ handle_nested_irq(sub_irq);
+ ++nhandled;
+ }
+ }
+ }
+
+ return (nhandled > 0 ? IRQ_HANDLED : IRQ_NONE);
+}
+
+static void sx150x_irq_bus_lock(unsigned int irq)
+{
+ struct irq_chip *ic = get_irq_chip(irq);
+ struct sx150x_chip *chip;
+
+ chip = container_of(ic, struct sx150x_chip, irq_chip);
+
+ mutex_lock(&chip->lock);
+}
+
+static void sx150x_irq_bus_sync_unlock(unsigned int irq)
+{
+ struct irq_chip *ic = get_irq_chip(irq);
+ struct sx150x_chip *chip;
+ unsigned n;
+
+ chip = container_of(ic, struct sx150x_chip, irq_chip);
+
+ while (chip->irq_set_type_pending) {
+ n = __ffs(chip->irq_set_type_pending);
+ chip->irq_set_type_pending &= ~BIT(n);
+ if (!(irq_to_desc(n + chip->irq_base)->status & IRQ_MASKED))
+ sx150x_write_cfg(chip, n, 2,
+ chip->dev_cfg->reg_sense,
+ chip->irq_sense >> (n * 2));
+ }
+
+ mutex_unlock(&chip->lock);
+}
+
+static void sx150x_init_chip(struct sx150x_chip *chip,
+ struct i2c_client *client,
+ kernel_ulong_t driver_data,
+ struct sx150x_platform_data *pdata)
+{
+ mutex_init(&chip->lock);
+
+ chip->client = client;
+ chip->dev_cfg = &sx150x_devices[driver_data];
+ chip->gpio_chip.label = client->name;
+ chip->gpio_chip.direction_input = sx150x_gpio_direction_input;
+ chip->gpio_chip.direction_output = sx150x_gpio_direction_output;
+ chip->gpio_chip.get = sx150x_gpio_get;
+ chip->gpio_chip.set = sx150x_gpio_set;
+ chip->gpio_chip.to_irq = sx150x_gpio_to_irq;
+ chip->gpio_chip.base = pdata->gpio_base;
+ chip->gpio_chip.can_sleep = 1;
+ chip->gpio_chip.ngpio = chip->dev_cfg->ngpios;
+ if (pdata->oscio_is_gpo)
+ ++chip->gpio_chip.ngpio;
+
+ chip->irq_chip.name = client->name;
+ chip->irq_chip.mask = sx150x_irq_mask;
+ chip->irq_chip.unmask = sx150x_irq_unmask;
+ chip->irq_chip.set_type = sx150x_irq_set_type;
+ chip->irq_chip.bus_lock = sx150x_irq_bus_lock;
+ chip->irq_chip.bus_sync_unlock = sx150x_irq_bus_sync_unlock;
+ chip->irq_summary = -1;
+ chip->irq_base = -1;
+ chip->irq_sense = 0;
+ chip->irq_set_type_pending = 0;
+}
+
+static int sx150x_init_io(struct sx150x_chip *chip, u8 base, u16 cfg)
+{
+ int err = 0;
+ unsigned n;
+
+ for (n = 0; err >= 0 && n < (chip->dev_cfg->ngpios / 8); ++n)
+ err = sx150x_i2c_write(chip->client, base - n, cfg >> (n * 8));
+ return err;
+}
+
+static int sx150x_init_hw(struct sx150x_chip *chip,
+ struct sx150x_platform_data *pdata)
+{
+ int err = 0;
+
+ err = i2c_smbus_write_word_data(chip->client,
+ chip->dev_cfg->reg_reset,
+ 0x3412);
+ if (err < 0)
+ return err;
+
+ err = sx150x_i2c_write(chip->client,
+ chip->dev_cfg->reg_misc,
+ 0x01);
+ if (err < 0)
+ return err;
+
+ err = sx150x_init_io(chip, chip->dev_cfg->reg_pullup,
+ pdata->io_pullup_ena);
+ if (err < 0)
+ return err;
+
+ err = sx150x_init_io(chip, chip->dev_cfg->reg_pulldn,
+ pdata->io_pulldn_ena);
+ if (err < 0)
+ return err;
+
+ err = sx150x_init_io(chip, chip->dev_cfg->reg_drain,
+ pdata->io_open_drain_ena);
+ if (err < 0)
+ return err;
+
+ err = sx150x_init_io(chip, chip->dev_cfg->reg_polarity,
+ pdata->io_polarity);
+ if (err < 0)
+ return err;
+
+ if (pdata->oscio_is_gpo)
+ sx150x_set_oscio(chip, 0);
+
+ return err;
+}
+
+static int sx150x_install_irq_chip(struct sx150x_chip *chip,
+ int irq_summary,
+ int irq_base)
+{
+ int err;
+ unsigned n;
+ unsigned irq;
+
+ chip->irq_summary = irq_summary;
+ chip->irq_base = irq_base;
+
+ for (n = 0; n < chip->dev_cfg->ngpios; ++n) {
+ irq = irq_base + n;
+ set_irq_chip_and_handler(irq, &chip->irq_chip, handle_edge_irq);
+ set_irq_nested_thread(irq, 1);
+#ifdef CONFIG_ARM
+ set_irq_flags(irq, IRQF_VALID);
+#else
+ set_irq_noprobe(irq);
+#endif
+ }
+
+ err = request_threaded_irq(irq_summary,
+ NULL,
+ sx150x_irq_thread_fn,
+ IRQF_SHARED | IRQF_TRIGGER_FALLING,
+ chip->irq_chip.name,
+ chip);
+ if (err < 0) {
+ chip->irq_summary = -1;
+ chip->irq_base = -1;
+ }
+
+ return err;
+}
+
+static void sx150x_remove_irq_chip(struct sx150x_chip *chip)
+{
+ unsigned n;
+ unsigned irq;
+
+ free_irq(chip->irq_summary, chip);
+
+ for (n = 0; n < chip->dev_cfg->ngpios; ++n) {
+ irq = chip->irq_base + n;
+ set_irq_handler(irq, NULL);
+ set_irq_chip(irq, NULL);
+ }
+}
+
+static int __devinit sx150x_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ static const u32 i2c_funcs = I2C_FUNC_SMBUS_BYTE_DATA |
+ I2C_FUNC_SMBUS_WRITE_WORD_DATA;
+ struct sx150x_platform_data *pdata;
+ struct sx150x_chip *chip;
+ int rc;
+
+ pdata = client->dev.platform_data;
+ if (!pdata)
+ return -EINVAL;
+
+ if (!i2c_check_functionality(client->adapter, i2c_funcs))
+ return -ENOSYS;
+
+ chip = kzalloc(sizeof(struct sx150x_chip), GFP_KERNEL);
+ if (!chip)
+ return -ENOMEM;
+
+ sx150x_init_chip(chip, client, id->driver_data, pdata);
+ rc = sx150x_init_hw(chip, pdata);
+ if (rc < 0)
+ goto probe_fail_pre_gpiochip_add;
+
+ rc = gpiochip_add(&chip->gpio_chip);
+ if (rc < 0)
+ goto probe_fail_pre_gpiochip_add;
+
+ if (pdata->irq_summary >= 0) {
+ rc = sx150x_install_irq_chip(chip,
+ pdata->irq_summary,
+ pdata->irq_base);
+ if (rc < 0)
+ goto probe_fail_post_gpiochip_add;
+ }
+
+ i2c_set_clientdata(client, chip);
+
+ return 0;
+probe_fail_post_gpiochip_add:
+ WARN_ON(gpiochip_remove(&chip->gpio_chip) < 0);
+probe_fail_pre_gpiochip_add:
+ kfree(chip);
+ return rc;
+}
+
+static int __devexit sx150x_remove(struct i2c_client *client)
+{
+ struct sx150x_chip *chip;
+ int rc;
+
+ chip = i2c_get_clientdata(client);
+ rc = gpiochip_remove(&chip->gpio_chip);
+ if (rc < 0)
+ return rc;
+
+ if (chip->irq_summary >= 0)
+ sx150x_remove_irq_chip(chip);
+
+ kfree(chip);
+
+ return 0;
+}
+
+static struct i2c_driver sx150x_driver = {
+ .driver = {
+ .name = "sx150x",
+ .owner = THIS_MODULE
+ },
+ .probe = sx150x_probe,
+ .remove = __devexit_p(sx150x_remove),
+ .id_table = sx150x_id,
+};
+
+static int __init sx150x_init(void)
+{
+ return i2c_add_driver(&sx150x_driver);
+}
+subsys_initcall(sx150x_init);
+
+static void __exit sx150x_exit(void)
+{
+ return i2c_del_driver(&sx150x_driver);
+}
+module_exit(sx150x_exit);
+
+MODULE_AUTHOR("Gregory Bean <gbean@codeaurora.org>");
+MODULE_DESCRIPTION("Driver for Semtech SX150X I2C GPIO Expanders");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("i2c:sx150x");
diff --git a/drivers/gpio/wm831x-gpio.c b/drivers/gpio/wm831x-gpio.c
index 1fa449a1a4cb..309644cf4d9b 100644
--- a/drivers/gpio/wm831x-gpio.c
+++ b/drivers/gpio/wm831x-gpio.c
@@ -108,6 +108,37 @@ static int wm831x_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
return wm831x->irq_base + WM831X_IRQ_GPIO_1 + offset;
}
+static int wm831x_gpio_set_debounce(struct gpio_chip *chip, unsigned offset,
+ unsigned debounce)
+{
+ struct wm831x_gpio *wm831x_gpio = to_wm831x_gpio(chip);
+ struct wm831x *wm831x = wm831x_gpio->wm831x;
+ int reg = WM831X_GPIO1_CONTROL + offset;
+ int ret, fn;
+
+ ret = wm831x_reg_read(wm831x, reg);
+ if (ret < 0)
+ return ret;
+
+ switch (ret & WM831X_GPN_FN_MASK) {
+ case 0:
+ case 1:
+ break;
+ default:
+ /* Not in GPIO mode */
+ return -EBUSY;
+ }
+
+ if (debounce >= 32 && debounce <= 64)
+ fn = 0;
+ else if (debounce >= 4000 && debounce <= 8000)
+ fn = 1;
+ else
+ return -EINVAL;
+
+ return wm831x_set_bits(wm831x, reg, WM831X_GPN_FN_MASK, fn);
+}
+
#ifdef CONFIG_DEBUG_FS
static void wm831x_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
{
@@ -208,6 +239,7 @@ static struct gpio_chip template_chip = {
.direction_output = wm831x_gpio_direction_out,
.set = wm831x_gpio_set,
.to_irq = wm831x_gpio_to_irq,
+ .set_debounce = wm831x_gpio_set_debounce,
.dbg_show = wm831x_gpio_dbg_show,
.can_sleep = 1,
};
diff --git a/drivers/gpio/xilinx_gpio.c b/drivers/gpio/xilinx_gpio.c
index b8fa65b5bfca..709690995d0d 100644
--- a/drivers/gpio/xilinx_gpio.c
+++ b/drivers/gpio/xilinx_gpio.c
@@ -161,14 +161,12 @@ static void xgpio_save_regs(struct of_mm_gpio_chip *mm_gc)
static int __devinit xgpio_of_probe(struct device_node *np)
{
struct xgpio_instance *chip;
- struct of_gpio_chip *ofchip;
int status = 0;
const u32 *tree_info;
chip = kzalloc(sizeof(*chip), GFP_KERNEL);
if (!chip)
return -ENOMEM;
- ofchip = &chip->mmchip.of_gc;
/* Update GPIO state shadow register with default value */
tree_info = of_get_property(np, "xlnx,dout-default", NULL);
@@ -182,21 +180,20 @@ static int __devinit xgpio_of_probe(struct device_node *np)
chip->gpio_dir = *tree_info;
/* Check device node and parent device node for device width */
- ofchip->gc.ngpio = 32; /* By default assume full GPIO controller */
+ chip->mmchip.gc.ngpio = 32; /* By default assume full GPIO controller */
tree_info = of_get_property(np, "xlnx,gpio-width", NULL);
if (!tree_info)
tree_info = of_get_property(np->parent,
"xlnx,gpio-width", NULL);
if (tree_info)
- ofchip->gc.ngpio = *tree_info;
+ chip->mmchip.gc.ngpio = *tree_info;
spin_lock_init(&chip->gpio_lock);
- ofchip->gpio_cells = 2;
- ofchip->gc.direction_input = xgpio_dir_in;
- ofchip->gc.direction_output = xgpio_dir_out;
- ofchip->gc.get = xgpio_get;
- ofchip->gc.set = xgpio_set;
+ chip->mmchip.gc.direction_input = xgpio_dir_in;
+ chip->mmchip.gc.direction_output = xgpio_dir_out;
+ chip->mmchip.gc.get = xgpio_get;
+ chip->mmchip.gc.set = xgpio_set;
chip->mmchip.save_regs = xgpio_save_regs;
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.