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Date: Mon, 19 Dec 2011 12:34:18 -0800
From: Randy Dunlap <rdunlap@...otime.net>
To: NeilBrown <neilb@...e.de>
CC: Andrew Morton <akpm@...ux-foundation.org>, rpurdie@...ys.net,
linux-kernel@...r.kernel.org,
Stephen Rothwell <sfr@...b.auug.org.au>
Subject: Re: [PATCH 1/2] leds-tca6507: allow driver to compile when GPIOLIB
is not available.
On 12/18/2011 04:20 PM, NeilBrown wrote:
> 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>
Hi Neil,
with linux-next 20111219 and this patch applied, I now get:
drivers/leds/leds-tca6507.c: In function 'tca6507_remove':
drivers/leds/leds-tca6507.c:677:9: error: 'struct tca6507_chip' has no member named 'gpio'
drivers/leds/leds-tca6507.c:678:3: error: implicit declaration of function 'gpiochip_remove'
drivers/leds/leds-tca6507.c:678:33: error: 'struct tca6507_chip' has no member named 'gpio'
when GPIOLIB is not enabled.
> ---
>
> 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
>
>
> --
--
~Randy
*** Remember to use Documentation/SubmitChecklist when testing your code ***
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