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Subject[PATCH V4 2/4] input: keyboard: tegra: use devm_* for resource allocation
Date
Use devm_* for memory, clock, irq, input device allocation. This reduces
code for freeing these resources.

Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
---
Changes from V1: None
Changes from V2:
- remove the error checks changes from original.
- return -EBUSY when reg mapping fail.
- remove unregister_input_device() devm_* version is used.
- Pass correct argument in free_irq.

Changes from V3:
- use devm_request_irq().
- get rid of tegra_kbc_remove() as all resource allocations are now managed.

drivers/input/keyboard/tegra-kbc.c | 105 +++++++++--------------------------
1 files changed, 27 insertions(+), 78 deletions(-)

diff --git a/drivers/input/keyboard/tegra-kbc.c b/drivers/input/keyboard/tegra-kbc.c
index f1d3ba0..f799936 100644
--- a/drivers/input/keyboard/tegra-kbc.c
+++ b/drivers/input/keyboard/tegra-kbc.c
@@ -618,7 +618,7 @@ static struct tegra_kbc_platform_data *tegra_kbc_dt_parse_pdata(
if (!np)
return NULL;

- pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
+ pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
if (!pdata)
return NULL;

@@ -700,33 +700,36 @@ static int tegra_kbc_probe(struct platform_device *pdev)
if (!pdata)
pdata = tegra_kbc_dt_parse_pdata(pdev);

- if (!pdata)
+ if (!pdata) {
+ dev_err(&pdev->dev, "Platform data missing\n");
return -EINVAL;
-
- if (!tegra_kbc_check_pin_cfg(pdata, &pdev->dev, &num_rows)) {
- err = -EINVAL;
- goto err_free_pdata;
}

+ if (!tegra_kbc_check_pin_cfg(pdata, &pdev->dev, &num_rows))
+ return -EINVAL;
+
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
dev_err(&pdev->dev, "failed to get I/O memory\n");
- err = -ENXIO;
- goto err_free_pdata;
+ return -ENXIO;
}

irq = platform_get_irq(pdev, 0);
if (irq < 0) {
dev_err(&pdev->dev, "failed to get keyboard IRQ\n");
- err = -ENXIO;
- goto err_free_pdata;
+ return -ENXIO;
}

- kbc = kzalloc(sizeof(*kbc), GFP_KERNEL);
- input_dev = input_allocate_device();
- if (!kbc || !input_dev) {
- err = -ENOMEM;
- goto err_free_mem;
+ kbc = devm_kzalloc(&pdev->dev, sizeof(*kbc), GFP_KERNEL);
+ if (!kbc) {
+ dev_err(&pdev->dev, "failed to alloc memory for kbc\n");
+ return -ENOMEM;
+ }
+
+ input_dev = devm_input_allocate_device(&pdev->dev);
+ if (!input_dev) {
+ dev_err(&pdev->dev, "failed to allocate input device\n");
+ return -ENOMEM;
}

kbc->pdata = pdata;
@@ -735,25 +738,16 @@ static int tegra_kbc_probe(struct platform_device *pdev)
spin_lock_init(&kbc->lock);
setup_timer(&kbc->timer, tegra_kbc_keypress_timer, (unsigned long)kbc);

- res = request_mem_region(res->start, resource_size(res), pdev->name);
- if (!res) {
- dev_err(&pdev->dev, "failed to request I/O memory\n");
- err = -EBUSY;
- goto err_free_mem;
- }
-
- kbc->mmio = ioremap(res->start, resource_size(res));
+ kbc->mmio = devm_request_and_ioremap(&pdev->dev, res);
if (!kbc->mmio) {
- dev_err(&pdev->dev, "failed to remap I/O memory\n");
- err = -ENXIO;
- goto err_free_mem_region;
+ dev_err(&pdev->dev, "Cannot request memregion/iomap address\n");
+ return -EBUSY;
}

- kbc->clk = clk_get(&pdev->dev, NULL);
+ kbc->clk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(kbc->clk)) {
dev_err(&pdev->dev, "failed to get keyboard clock\n");
- err = PTR_ERR(kbc->clk);
- goto err_iounmap;
+ return PTR_ERR(kbc->clk);
}

/*
@@ -780,7 +774,7 @@ static int tegra_kbc_probe(struct platform_device *pdev)
err = tegra_kbd_setup_keymap(kbc);
if (err) {
dev_err(&pdev->dev, "failed to setup keymap\n");
- goto err_put_clk;
+ return err;
}

__set_bit(EV_REP, input_dev->evbit);
@@ -788,11 +782,11 @@ static int tegra_kbc_probe(struct platform_device *pdev)

input_set_drvdata(input_dev, kbc);

- err = request_irq(kbc->irq, tegra_kbc_isr,
+ err = devm_request_irq(&pdev->dev, kbc->irq, tegra_kbc_isr,
IRQF_NO_SUSPEND | IRQF_TRIGGER_HIGH, pdev->name, kbc);
if (err) {
dev_err(&pdev->dev, "failed to request keyboard IRQ\n");
- goto err_put_clk;
+ return err;
}

disable_irq(kbc->irq);
@@ -800,57 +794,13 @@ static int tegra_kbc_probe(struct platform_device *pdev)
err = input_register_device(kbc->idev);
if (err) {
dev_err(&pdev->dev, "failed to register input device\n");
- goto err_free_irq;
+ return err;
}

platform_set_drvdata(pdev, kbc);
device_init_wakeup(&pdev->dev, pdata->wakeup);

return 0;
-
-err_free_irq:
- free_irq(kbc->irq, pdev);
-err_put_clk:
- clk_put(kbc->clk);
-err_iounmap:
- iounmap(kbc->mmio);
-err_free_mem_region:
- release_mem_region(res->start, resource_size(res));
-err_free_mem:
- input_free_device(input_dev);
- kfree(kbc);
-err_free_pdata:
- if (!pdev->dev.platform_data)
- kfree(pdata);
-
- return err;
-}
-
-static int tegra_kbc_remove(struct platform_device *pdev)
-{
- struct tegra_kbc *kbc = platform_get_drvdata(pdev);
- struct resource *res;
-
- platform_set_drvdata(pdev, NULL);
-
- free_irq(kbc->irq, pdev);
- clk_put(kbc->clk);
-
- input_unregister_device(kbc->idev);
- iounmap(kbc->mmio);
- res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- release_mem_region(res->start, resource_size(res));
-
- /*
- * If we do not have platform data attached to the device we
- * allocated it ourselves and thus need to free it.
- */
- if (!pdev->dev.platform_data)
- kfree(kbc->pdata);
-
- kfree(kbc);
-
- return 0;
}

#ifdef CONFIG_PM_SLEEP
@@ -954,7 +904,6 @@ MODULE_DEVICE_TABLE(of, tegra_kbc_of_match);

static struct platform_driver tegra_kbc_driver = {
.probe = tegra_kbc_probe,
- .remove = tegra_kbc_remove,
.driver = {
.name = "tegra-kbc",
.owner = THIS_MODULE,
--
1.7.1.1


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