[PATCH v2 1/2] Input: tegra-kbc - add device tree bindings
Dmitry Torokhov
dmitry.torokhov at gmail.com
Wed Dec 28 01:48:32 EST 2011
Hi Olof,
On Tue, Dec 27, 2011 at 10:19:29PM -0800, Olof Johansson wrote:
> This adds a simple device tree binding to the tegra keyboard controller.
>
> Also, mark the default keymap as __devinitdata since it is not referenced
> after boot, and shorten the name to not have to avoid line wraps.
No, let's keep the names prefixed to match the rest of the driver(s).
> +
> + pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
Error handling is missing. I also dislike devm_* facilities as it causes
inconsistencies in the way we handle releasing of resources: some of
them will be released automatically while others need t be released
manually. I prefer having consistent model.
Does the patch below still work for you?
Thanks.
--
Dmitry
Input: tegra-kbc - add device tree bindings
From: Olof Johansson <olof at lixom.net>
This adds a simple device tree binding to the tegra keyboard controller.
Also, mark the default keymap as __devinitdata since it is not referenced
after boot.
Signed-off-by: Olof Johansson <olof at lixom.net>
Signed-off-by: Dmitry Torokhov <dtor at mail.ru>
---
.../devicetree/bindings/input/tegra-kbc.txt | 18 ++++
drivers/input/keyboard/tegra-kbc.c | 92 ++++++++++++++++++--
2 files changed, 102 insertions(+), 8 deletions(-)
create mode 100644 Documentation/devicetree/bindings/input/tegra-kbc.txt
diff --git a/Documentation/devicetree/bindings/input/tegra-kbc.txt b/Documentation/devicetree/bindings/input/tegra-kbc.txt
new file mode 100644
index 0000000..5ecfa99
--- /dev/null
+++ b/Documentation/devicetree/bindings/input/tegra-kbc.txt
@@ -0,0 +1,18 @@
+* Tegra keyboard controller
+
+Required properties:
+- compatible: "nvidia,tegra20-kbc"
+
+Optional properties:
+- debounce-delay: delay in milliseconds per row scan for debouncing
+- repeat-delay: delay in milliseconds before repeat starts
+- ghost-filter: enable ghost filtering for this device
+- wakeup-source: configure keyboard as a wakeup source for suspend/resume
+
+Example:
+
+keyboard: keyboard {
+ compatible = "nvidia,tegra20-kbc";
+ reg = <0x7000e200 0x100>;
+ ghost-filter;
+};
diff --git a/drivers/input/keyboard/tegra-kbc.c b/drivers/input/keyboard/tegra-kbc.c
index 08d02f2..b77725d 100644
--- a/drivers/input/keyboard/tegra-kbc.c
+++ b/drivers/input/keyboard/tegra-kbc.c
@@ -26,6 +26,7 @@
#include <linux/delay.h>
#include <linux/io.h>
#include <linux/interrupt.h>
+#include <linux/of.h>
#include <linux/clk.h>
#include <linux/slab.h>
#include <mach/clk.h>
@@ -82,7 +83,7 @@ struct tegra_kbc {
struct clk *clk;
};
-static const u32 tegra_kbc_default_keymap[] = {
+static const u32 tegra_kbc_default_keymap[] __devinitdata = {
KEY(0, 2, KEY_W),
KEY(0, 3, KEY_S),
KEY(0, 4, KEY_A),
@@ -217,7 +218,8 @@ static const u32 tegra_kbc_default_keymap[] = {
KEY(31, 4, KEY_HELP),
};
-static const struct matrix_keymap_data tegra_kbc_default_keymap_data = {
+static const
+struct matrix_keymap_data tegra_kbc_default_keymap_data __devinitdata = {
.keymap = tegra_kbc_default_keymap,
.keymap_size = ARRAY_SIZE(tegra_kbc_default_keymap),
};
@@ -576,6 +578,56 @@ tegra_kbc_check_pin_cfg(const struct tegra_kbc_platform_data *pdata,
return true;
}
+#ifdef CONFIG_OF
+static struct tegra_kbc_platform_data * __devinit
+tegra_kbc_dt_parse_pdata(struct platform_device *pdev)
+{
+ struct tegra_kbc_platform_data *pdata;
+ struct device_node *np = pdev->dev.of_node;
+
+ if (!np)
+ return NULL;
+
+ pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
+ if (!pdata)
+ return NULL;
+
+ if (!of_property_read_u32(np, "debounce-delay", &prop))
+ pdata->debounce_cnt = prop;
+
+ if (!of_property_read_u32(np, "repeat-delay", &prop))
+ pdata->repeat_cnt = prop;
+
+ if (of_find_property(np, "needs-ghost-filter", NULL))
+ pdata->use_ghost_filter = true;
+
+ if (of_find_property(np, "wakeup-source", NULL))
+ pdata->wakeup = true;
+
+ /*
+ * All currently known keymaps with device tree support use the same
+ * pin_cfg, so set it up here.
+ */
+ for (i = 0; i < KBC_MAX_ROW; i++) {
+ pdata->pin_cfg[i].num = i;
+ pdata->pin_cfg[i].is_row = true;
+ }
+
+ for (i = 0; i < KBC_MAX_COL; i++) {
+ pdata->pin_cfg[KBC_MAX_ROW + i].num = i;
+ pdata->pin_cfg[KBC_MAX_ROW + i].is_row = false;
+ }
+
+ return pdata;
+}
+#else
+static inline struct tegra_kbc_platform_data *tegra_kbc_dt_parse_pdata(
+ struct platform_device *pdev)
+{
+ return NULL;
+}
+#endif
+
static int __devinit tegra_kbc_probe(struct platform_device *pdev)
{
const struct tegra_kbc_platform_data *pdata = pdev->dev.platform_data;
@@ -590,21 +642,28 @@ static int __devinit tegra_kbc_probe(struct platform_device *pdev)
unsigned int scan_time_rows;
if (!pdata)
- return -EINVAL;
+ pdata = tegra_kbc_dt_parse_pdata(pdev);
- if (!tegra_kbc_check_pin_cfg(pdata, &pdev->dev, &num_rows))
+ if (!pdata)
return -EINVAL;
+ if (!tegra_kbc_check_pin_cfg(pdata, &pdev->dev, &num_rows)) {
+ err = -EINVAL;
+ goto err_free_pdata;
+ }
+
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
dev_err(&pdev->dev, "failed to get I/O memory\n");
- return -ENXIO;
+ err = -ENXIO;
+ goto err_free_pdata;
}
irq = platform_get_irq(pdev, 0);
if (irq < 0) {
dev_err(&pdev->dev, "failed to get keyboard IRQ\n");
- return -ENXIO;
+ err = -ENXIO;
+ goto err_free_pdata;
}
kbc = kzalloc(sizeof(*kbc), GFP_KERNEL);
@@ -706,6 +765,9 @@ err_free_mem_region:
err_free_mem:
input_free_device(input_dev);
kfree(kbc);
+err_free_pdata:
+ if (!pdev->dev.platform_data)
+ kfree(pdata);
return err;
}
@@ -715,6 +777,8 @@ static int __devexit 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);
@@ -723,9 +787,14 @@ static int __devexit tegra_kbc_remove(struct platform_device *pdev)
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
release_mem_region(res->start, resource_size(res));
- kfree(kbc);
+ /*
+ * 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);
- platform_set_drvdata(pdev, NULL);
+ kfree(kbc);
return 0;
}
@@ -793,6 +862,12 @@ static int tegra_kbc_resume(struct device *dev)
static SIMPLE_DEV_PM_OPS(tegra_kbc_pm_ops, tegra_kbc_suspend, tegra_kbc_resume);
+static const struct of_device_id tegra_kbc_of_match[] = {
+ { .compatible = "nvidia,tegra20-kbc", },
+ { },
+};
+MODULE_DEVICE_TABLE(of, tegra_kbc_of_match);
+
static struct platform_driver tegra_kbc_driver = {
.probe = tegra_kbc_probe,
.remove = __devexit_p(tegra_kbc_remove),
@@ -800,6 +875,7 @@ static struct platform_driver tegra_kbc_driver = {
.name = "tegra-kbc",
.owner = THIS_MODULE,
.pm = &tegra_kbc_pm_ops,
+ .of_match_table = tegra_kbc_of_match,
},
};
module_platform_driver(tegra_kbc_driver);
More information about the linux-arm-kernel
mailing list