diff options
Diffstat (limited to 'drivers/mmc/core/pwrseq_emmc.c')
-rw-r--r-- | drivers/mmc/core/pwrseq_emmc.c | 91 |
1 files changed, 61 insertions, 30 deletions
diff --git a/drivers/mmc/core/pwrseq_emmc.c b/drivers/mmc/core/pwrseq_emmc.c index 9d6d2fb21796..0b12bd79ba8e 100644 --- a/drivers/mmc/core/pwrseq_emmc.c +++ b/drivers/mmc/core/pwrseq_emmc.c @@ -9,6 +9,8 @@ */ #include <linux/delay.h> #include <linux/kernel.h> +#include <linux/platform_device.h> +#include <linux/module.h> #include <linux/slab.h> #include <linux/device.h> #include <linux/err.h> @@ -16,7 +18,6 @@ #include <linux/reboot.h> #include <linux/mmc/host.h> - #include "pwrseq.h" struct mmc_pwrseq_emmc { @@ -25,6 +26,8 @@ struct mmc_pwrseq_emmc { struct gpio_desc *reset_gpio; }; +#define to_pwrseq_emmc(p) container_of(p, struct mmc_pwrseq_emmc, pwrseq) + static void __mmc_pwrseq_emmc_reset(struct mmc_pwrseq_emmc *pwrseq) { gpiod_set_value(pwrseq->reset_gpio, 1); @@ -35,52 +38,37 @@ static void __mmc_pwrseq_emmc_reset(struct mmc_pwrseq_emmc *pwrseq) static void mmc_pwrseq_emmc_reset(struct mmc_host *host) { - struct mmc_pwrseq_emmc *pwrseq = container_of(host->pwrseq, - struct mmc_pwrseq_emmc, pwrseq); + struct mmc_pwrseq_emmc *pwrseq = to_pwrseq_emmc(host->pwrseq); __mmc_pwrseq_emmc_reset(pwrseq); } static void mmc_pwrseq_emmc_free(struct mmc_host *host) { - struct mmc_pwrseq_emmc *pwrseq = container_of(host->pwrseq, - struct mmc_pwrseq_emmc, pwrseq); + struct mmc_pwrseq_emmc *pwrseq = to_pwrseq_emmc(host->pwrseq); unregister_restart_handler(&pwrseq->reset_nb); gpiod_put(pwrseq->reset_gpio); - kfree(pwrseq); } -static struct mmc_pwrseq_ops mmc_pwrseq_emmc_ops = { - .post_power_on = mmc_pwrseq_emmc_reset, - .free = mmc_pwrseq_emmc_free, -}; - static int mmc_pwrseq_emmc_reset_nb(struct notifier_block *this, unsigned long mode, void *cmd) { struct mmc_pwrseq_emmc *pwrseq = container_of(this, - struct mmc_pwrseq_emmc, reset_nb); + struct mmc_pwrseq_emmc, reset_nb); __mmc_pwrseq_emmc_reset(pwrseq); return NOTIFY_DONE; } -struct mmc_pwrseq *mmc_pwrseq_emmc_alloc(struct mmc_host *host, - struct device *dev) +static int mmc_pwrseq_emmc_alloc(struct mmc_host *host) { - struct mmc_pwrseq_emmc *pwrseq; - int ret = 0; - - pwrseq = kzalloc(sizeof(struct mmc_pwrseq_emmc), GFP_KERNEL); - if (!pwrseq) - return ERR_PTR(-ENOMEM); - - pwrseq->reset_gpio = gpiod_get_index(dev, "reset", 0, GPIOD_OUT_LOW); - if (IS_ERR(pwrseq->reset_gpio)) { - ret = PTR_ERR(pwrseq->reset_gpio); - goto free; - } + struct mmc_pwrseq_emmc *pwrseq = to_pwrseq_emmc(host->pwrseq); + + pwrseq->reset_gpio = gpiod_get_index(host->pwrseq->dev, + "reset", 0, GPIOD_OUT_LOW); + if (IS_ERR(pwrseq->reset_gpio)) + return PTR_ERR(pwrseq->reset_gpio); /* * register reset handler to ensure emmc reset also from @@ -91,10 +79,53 @@ struct mmc_pwrseq *mmc_pwrseq_emmc_alloc(struct mmc_host *host, pwrseq->reset_nb.priority = 129; register_restart_handler(&pwrseq->reset_nb); + return 0; +} + +static struct mmc_pwrseq_ops mmc_pwrseq_emmc_ops = { + .alloc = mmc_pwrseq_emmc_alloc, + .post_power_on = mmc_pwrseq_emmc_reset, + .free = mmc_pwrseq_emmc_free, +}; + +static int mmc_pwrseq_emmc_probe(struct platform_device *pdev) +{ + struct mmc_pwrseq_emmc *pwrseq; + struct device *dev = &pdev->dev; + + pwrseq = devm_kzalloc(dev, sizeof(*pwrseq), GFP_KERNEL); + if (!pwrseq) + return -ENOMEM; + pwrseq->pwrseq.ops = &mmc_pwrseq_emmc_ops; + pwrseq->pwrseq.dev = dev; + + platform_set_drvdata(pdev, pwrseq); - return &pwrseq->pwrseq; -free: - kfree(pwrseq); - return ERR_PTR(ret); + return mmc_pwrseq_register(&pwrseq->pwrseq); } + +static int mmc_pwrseq_emmc_remove(struct platform_device *pdev) +{ + struct mmc_pwrseq_emmc *spwrseq = platform_get_drvdata(pdev); + + return mmc_pwrseq_unregister(&spwrseq->pwrseq); +} + +static const struct of_device_id mmc_pwrseq_emmc_of_match[] = { + { .compatible = "mmc-pwrseq-emmc",}, + {/* sentinel */}, +}; +MODULE_DEVICE_TABLE(of, mmc_pwrseq_emmc_of_match); + +static struct platform_driver mmc_pwrseq_emmc_driver = { + .probe = mmc_pwrseq_emmc_probe, + .remove = mmc_pwrseq_emmc_remove, + .driver = { + .name = "pwrseq_emmc", + .of_match_table = mmc_pwrseq_emmc_of_match, + }, +}; + +module_platform_driver(mmc_pwrseq_emmc_driver); +MODULE_LICENSE("GPL v2"); |