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Date: Thu, 6 Dec 2012 11:52:05 +0100
From: Peter Ujfalusi <peter.ujfalusi@...com>
To: Grant Likely <grant.likely@...retlab.ca>,
Linus Walleij <linus.walleij@...aro.org>
CC: <linux-kernel@...r.kernel.org>, <linux-omap@...r.kernel.org>
Subject: [PATCH v2 1/3] gpio: twl4030: Introduce private structure to store variables needed runtime
Move most of the global variables inside a private structure and allocate
it dynamically.
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@...com>
---
drivers/gpio/gpio-twl4030.c | 82 +++++++++++++++++++++++++++------------------
1 file changed, 50 insertions(+), 32 deletions(-)
diff --git a/drivers/gpio/gpio-twl4030.c b/drivers/gpio/gpio-twl4030.c
index 55b4fe4..c092739 100644
--- a/drivers/gpio/gpio-twl4030.c
+++ b/drivers/gpio/gpio-twl4030.c
@@ -49,11 +49,6 @@
* 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
@@ -72,11 +67,20 @@ static int twl4030_gpio_irq_base;
/* Data structures */
static DEFINE_MUTEX(gpio_lock);
-/* store usage of each GPIO. - each bit represents one GPIO */
-static unsigned int gpio_usage_count;
+struct gpio_twl4030_priv {
+ struct gpio_chip gpio_chip;
+ int irq_base;
+
+ unsigned int usage_count;
+};
/*----------------------------------------------------------------------*/
+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
*/
@@ -193,10 +197,6 @@ 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)
@@ -209,6 +209,7 @@ 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);
@@ -252,7 +253,7 @@ 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;
@@ -266,16 +267,18 @@ 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);
return status;
}
static void twl_free(struct gpio_chip *chip, unsigned offset)
{
+ struct gpio_twl4030_priv *priv = to_gpio_twl4030(chip);
+
if (offset >= TWL4030_GPIO_MAX) {
twl4030_led_set_value(offset - TWL4030_GPIO_MAX, 1);
return;
@@ -283,10 +286,10 @@ static void twl_free(struct gpio_chip *chip, unsigned offset)
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);
@@ -301,14 +304,19 @@ static int twl_direction_in(struct gpio_chip *chip, unsigned offset)
static int twl_get(struct gpio_chip *chip, unsigned offset)
{
+ struct gpio_twl4030_priv *priv = to_gpio_twl4030(chip);
int status = 0;
+ if (!(priv->usage_count & BIT(offset)))
+ return -EPERM;
+
if (offset < TWL4030_GPIO_MAX)
status = twl4030_get_gpio_datain(offset);
else if (offset == TWL4030_GPIO_MAX)
status = cached_leden & LEDEN_LEDAON;
else
status = cached_leden & LEDEN_LEDBON;
+
return (status < 0) ? 0 : status;
}
@@ -333,12 +341,14 @@ static void twl_set(struct gpio_chip *chip, unsigned offset, int value)
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 +434,14 @@ static int __devinit 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 +461,13 @@ static int __devinit 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;
if (node)
pdata = of_gpio_twl4030(&pdev->dev);
@@ -481,23 +498,23 @@ no_irqs:
* 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 +527,19 @@ out:
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;
--
1.8.0
--
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