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Date: Mon, 19 Dec 2011 11:20:22 +1100
From: NeilBrown <neilb@...e.de>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: Randy Dunlap <rdunlap@...otime.net>,
Stephen Rothwell <sfr@...b.auug.org.au>
Subject: [PATCH 1/2] leds-tca6507: allow driver to compile when GPIOLIB is not
available.
This driver can configure the outputs as GPIO line instead of LEDs. But
that only works if GPIOLIB is available. So make that code conditional
on the library's availability.
Also remove the 'teardown' callback as it is never called and should
never be needed.
Reported-by: Randy Dunlap <rdunlap@...otime.net>,
Reported-by: Stephen Rothwell <sfr@...b.auug.org.au>,
Signed-off-by: NeilBrown <neilb@...e.de>
---
drivers/leds/leds-tca6507.c | 75 +++++++++++++++++++++++++++++-------------
include/linux/leds-tca6507.h | 3 +-
2 files changed, 53 insertions(+), 25 deletions(-)
diff --git a/drivers/leds/leds-tca6507.c b/drivers/leds/leds-tca6507.c
index a7ea4cf..c9cc3f7 100644
--- a/drivers/leds/leds-tca6507.c
+++ b/drivers/leds/leds-tca6507.c
@@ -149,9 +149,11 @@ struct tca6507_chip {
int bank; /* Bank used, or -1 */
int blink; /* 1 if we are hardware-blinking */
} leds[NUM_LEDS];
+#ifdef CONFIG_GPIOLIB
struct gpio_chip gpio;
const char *gpio_name[NUM_LEDS];
int gpio_map[NUM_LEDS];
+#endif
};
static const struct i2c_device_id tca6507_id[] = {
@@ -520,6 +522,7 @@ static int tca6507_blink_set(struct led_classdev *led_cdev,
return 0;
}
+#ifdef CONFIG_GPIOLIB
static void tca6507_gpio_set_value(struct gpio_chip *gc,
unsigned offset, int val)
{
@@ -542,6 +545,51 @@ static int tca6507_gpio_direction_output(struct gpio_chip *gc,
tca6507_gpio_set_value(gc, offset, val);
return 0;
}
+static int tca6507_probe_gpios(struct i2c_client *client,
+ struct tca6507_chip *tca,
+ struct tca6507_platform_data *pdata)
+{
+ int err;
+ int i = 0;
+ int gpios = 0;
+
+ for (i = 0; i < NUM_LEDS; i++)
+ if (pdata->leds.leds[i].name && pdata->leds.leds[i].flags) {
+ /* Configure as a gpio */
+ tca->gpio_name[gpios] = pdata->leds.leds[i].name;
+ tca->gpio_map[gpios] = i;
+ gpios++;
+ }
+
+ if (!gpios)
+ return 0;
+
+ tca->gpio.label = "gpio-tca6507";
+ tca->gpio.names = tca->gpio_name;
+ tca->gpio.ngpio = gpios;
+ tca->gpio.base = pdata->gpio_base;
+ tca->gpio.owner = THIS_MODULE;
+ tca->gpio.direction_output = tca6507_gpio_direction_output;
+ tca->gpio.set = tca6507_gpio_set_value;
+ tca->gpio.dev = &client->dev;
+ err = gpiochip_add(&tca->gpio);
+ if (err) {
+ tca->gpio.ngpio = 0;
+ return err;
+ }
+ if (pdata->setup)
+ pdata->setup(tca->gpio.base, tca->gpio.ngpio);
+ return 0;
+}
+
+#else /* CONFIG_GPIOLIB */
+static int tca6507_probe_gpios(struct i2c_client *client,
+ struct tca6507_chip *tca,
+ struct tca6507_platform_data *pdata)
+{
+ return 0;
+}
+#endif /* CONFIG_GPIOLIB */
static int __devinit tca6507_probe(struct i2c_client *client,
const struct i2c_device_id *id)
@@ -551,7 +599,6 @@ static int __devinit tca6507_probe(struct i2c_client *client,
struct tca6507_platform_data *pdata;
int err;
int i = 0;
- int gpios = 0;
adapter = to_i2c_adapter(client->dev.parent);
pdata = client->dev.platform_data;
@@ -590,30 +637,10 @@ static int __devinit tca6507_probe(struct i2c_client *client,
if (err < 0)
goto exit;
}
- if (pdata->leds.leds[i].name && pdata->leds.leds[i].flags) {
- /* Configure as a gpio */
- tca->gpio_name[gpios] = pdata->leds.leds[i].name;
- tca->gpio_map[gpios] = i;
- gpios++;
- }
- }
- if (gpios) {
- tca->gpio.label = "gpio-tca6507";
- tca->gpio.names = tca->gpio_name;
- tca->gpio.ngpio = gpios;
- tca->gpio.base = pdata->gpio_base;
- tca->gpio.owner = THIS_MODULE;
- tca->gpio.direction_output = tca6507_gpio_direction_output;
- tca->gpio.set = tca6507_gpio_set_value;
- tca->gpio.dev = &client->dev;
- err = gpiochip_add(&tca->gpio);
- if (err) {
- tca->gpio.ngpio = 0;
- goto exit;
- }
- if (pdata->setup)
- pdata->setup(tca->gpio.base, tca->gpio.ngpio);
}
+ err = tca6507_probe_gpios(client, tca, pdata);
+ if (err)
+ goto exit;
i2c_set_clientdata(client, tca);
/* set all registers to known state - zero */
tca->reg_set = 0x7f;
diff --git a/include/linux/leds-tca6507.h b/include/linux/leds-tca6507.h
index 3b8ac62..dcabf4f 100644
--- a/include/linux/leds-tca6507.h
+++ b/include/linux/leds-tca6507.h
@@ -24,9 +24,10 @@
struct tca6507_platform_data {
struct led_platform_data leds;
+#ifdef CONFIG_GPIOLIB
int gpio_base;
void (*setup)(unsigned gpio_base, unsigned ngpio);
- void (*teardown)(unsigned gpio_base, unsigned ngpio);
+#endif
};
#define TCA6507_MAKE_GPIO 1
--
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