On Sat, Feb 19, 2011 at 23:10, Bill Gatliff wrote:
> +static inline void pwmc_writel(const struct atmel_pwmc *p, unsigned offset,
> u32 val)
> +static inline u32 pwmc_readl(const struct atmel_pwmc *p, unsigned offset)
> +static inline void pwmc_chan_writel(const struct pwm_device *p,
> + u32 offset, u32 val)
> +static inline u32 pwmc_chan_readl(const struct pwm_device *p, u32 offset)
> +static inline int __atmel_pwmc_is_on(struct pwm_device *p)
> +static inline void __atmel_pwmc_stop(struct pwm_device *p)
> +static inline void __atmel_pwmc_start(struct pwm_device *p)
> +static inline int __atmel_pwmc_config_polarity(struct pwm_device *p,
> + struct pwm_config *c)
> +static inline int __atmel_pwmc_config_duty_ticks(struct pwm_device *p,
> + struct pwm_config *c)
> +static inline int __atmel_pwmc_config_period_ticks(struct pwm_device *p,
> + struct pwm_config *c)
seems like a lot of unnecessary inlines. while the first two might
make sense since they're really just redirecting to the read/write i/o
api, the rest are quite a bit bigger.
> +static inline int __atmel_pwmc_config_polarity(struct pwm_device *p,
> + struct pwm_config *c)
> +static inline int __atmel_pwmc_config_duty_ticks(struct pwm_device *p,
> + struct pwm_config *c)
> +static inline int __atmel_pwmc_config_period_ticks(struct pwm_device *p,
> + struct pwm_config *c)
these funcs always return 0 and the callers never check the return
value, so i guess these should return void instead
> +static int atmel_pwmc_stop_sync(struct pwm_device *p)
> +{
> + struct atmel_pwmc *ap = pwm_get_drvdata(p);
> + int was_on = __atmel_pwmc_is_on(p);
> + int chan = p - &ap->p[0];
> + int ret;
> +
> + if (was_on) {
> + do {
> + init_completion(&ap->complete);
> + set_bit(FLAG_STOP, &p->flags);
> + pwmc_writel(ap, PWMC_IER, BIT(chan));
> +
> + dev_dbg(p->dev, "waiting on stop_sync
> completion...\n");
> +
> + ret =
> wait_for_completion_interruptible(&ap->complete);
> +
> + dev_dbg(p->dev, "stop_sync complete (%d)\n", ret);
> +
> + if (ret)
> + return ret;
> + } while (test_bit(FLAG_STOP, &p->flags));
> + }
> +
> + return was_on;
> +}
if you changed this to return immediately when !was_on, then you
wouldnt need to indent the entire block.
> + ap->iobase = ioremap_nocache(r->start, r->end - r->start + 1);
isnt there a resource_size helper ?
> + if (IS_ERR_OR_NULL(ap->iobase)) {
> + ret = -ENODEV;
> + goto err_ioremap;
> + }
i dont think any of the io funcs return PTR_ERR. they all return NULL
or a valid address.
> + for (chan = 0; chan < NCHAN; chan++) {
> + ap->p[chan].ops = &ap->ops;
> + pwm_set_drvdata(&ap->p[chan], ap);
> + ret = pwm_register(&ap->p[chan], &pdev->dev, chan);
> + if (ret)
> + goto err_pwm_register;
> + }
> +
> +err_pwm_register:
> + for (chan = 0; chan < chan; chan++) {
> + if (pwm_is_registered(&ap->p[chan]))
> + pwm_unregister(&ap->p[chan]);
> + }
if you wanted to be tricky, you could just have the unwind not change
the value of "chan".
while (--chan > 0)
pwm_unregister(&ap->p[chan]);
otherwise, the "chan < chan" test makes no sense in the for loop.
> +static int __devexit atmel_pwmc_remove(struct platform_device *pdev)
> +{
> + struct atmel_pwmc *ap = platform_get_drvdata(pdev);
> + int chan;
> +
> + for (chan = 0; chan < NCHAN; chan++)
> + if (pwm_is_registered(&ap->p[chan]))
> + pwm_unregister(&ap->p[chan]);
why do you test if it's registered ? the probe function will abort if
any do not register properly.
-mike
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