| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-id: <1335198241-19344-2-git-send-email-k.lewandowsk@samsung.com>
Date: Mon, 23 Apr 2012 18:24:00 +0200
From: Karol Lewandowski <k.lewandowsk@...sung.com>
To: w.sang@...gutronix.de
Cc: m.szyprowski@...sung.com, ben-linux@...ff.org,
thomas.abraham@...aro.org, linux-kernel@...r.kernel.org,
linux-i2c@...r.kernel.org, devicetree-discuss@...ts.ozlabs.org,
linux-samsung-soc@...r.kernel.org, t.stanislaws@...sung.com,
kyungmin.park@...sung.com, broonie@...nsource.wolfsonmicro.com,
Karol Lewandowski <k.lewandowsk@...sung.com>
Subject: [PATCH 1/2] i2c-s3c2410: Rework device type handling
Reorganize driver a bit to better handle device tree-based systems:
- move machine type to driver's private structure instead of
quering platform device variants in runtime
- replace s3c24xx_i2c_type enum with unsigned int that holds
bitmask with revision-specific quirks
Signed-off-by: Karol Lewandowski <k.lewandowsk@...sung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@...sung.com>
---
drivers/i2c/busses/i2c-s3c2410.c | 75 +++++++++++++++++---------------------
1 file changed, 34 insertions(+), 41 deletions(-)
diff --git a/drivers/i2c/busses/i2c-s3c2410.c b/drivers/i2c/busses/i2c-s3c2410.c
index 85e3664..23736ff 100644
--- a/drivers/i2c/busses/i2c-s3c2410.c
+++ b/drivers/i2c/busses/i2c-s3c2410.c
@@ -44,8 +44,10 @@
#include <plat/regs-iic.h>
#include <plat/iic.h>
-/* i2c controller state */
+/* Treat S3C2410 as baseline hardware, anything else is supported via quirks */
+#define QUIRK_S3C2440 (1 << 0)
+/* i2c controller state */
enum s3c24xx_i2c_state {
STATE_IDLE,
STATE_START,
@@ -54,14 +56,10 @@ enum s3c24xx_i2c_state {
STATE_STOP
};
-enum s3c24xx_i2c_type {
- TYPE_S3C2410,
- TYPE_S3C2440,
-};
-
struct s3c24xx_i2c {
spinlock_t lock;
wait_queue_head_t wait;
+ unsigned int quirks;
unsigned int suspended:1;
struct i2c_msg *msg;
@@ -88,26 +86,40 @@ struct s3c24xx_i2c {
#endif
};
-/* default platform data removed, dev should always carry data. */
+static struct platform_device_id s3c24xx_driver_ids[] = {
+ {
+ .name = "s3c2410-i2c",
+ .driver_data = 0,
+ }, {
+ .name = "s3c2440-i2c",
+ .driver_data = QUIRK_S3C2440,
+ }, { },
+};
+MODULE_DEVICE_TABLE(platform, s3c24xx_driver_ids);
+
+#ifdef CONFIG_OF
+static const struct of_device_id s3c24xx_i2c_match[] = {
+ { .compatible = "samsung,s3c2410-i2c", .data = (void *)0 },
+ { .compatible = "samsung,s3c2440-i2c", .data = (void *)QUIRK_S3C2440 },
+ {},
+};
+MODULE_DEVICE_TABLE(of, s3c24xx_i2c_match);
+#endif
-/* s3c24xx_i2c_is2440()
+/* s3c24xx_get_device_quirks
*
- * return true is this is an s3c2440
+ * Get controller type either from device tree or platform device variant.
*/
-static inline int s3c24xx_i2c_is2440(struct s3c24xx_i2c *i2c)
+static inline unsigned int s3c24xx_get_device_quirks(struct platform_device *pdev)
{
- struct platform_device *pdev = to_platform_device(i2c->dev);
- enum s3c24xx_i2c_type type;
-
-#ifdef CONFIG_OF
- if (i2c->dev->of_node)
- return of_device_is_compatible(i2c->dev->of_node,
- "samsung,s3c2440-i2c");
-#endif
+ if (pdev->dev.of_node) {
+ const struct of_device_id *match;
+ match = of_match_node(&s3c24xx_i2c_match, pdev->dev.of_node);
+ return (unsigned int)match->data;
+ }
- type = platform_get_device_id(pdev)->driver_data;
- return type == TYPE_S3C2440;
+ return platform_get_device_id(pdev)->driver_data;
}
/* s3c24xx_i2c_master_complete
@@ -676,7 +688,7 @@ static int s3c24xx_i2c_clockrate(struct s3c24xx_i2c *i2c, unsigned int *got)
writel(iiccon, i2c->regs + S3C2410_IICCON);
- if (s3c24xx_i2c_is2440(i2c)) {
+ if (i2c->quirks & QUIRK_S3C2440) {
unsigned long sda_delay;
if (pdata->sda_delay) {
@@ -906,6 +918,7 @@ static int s3c24xx_i2c_probe(struct platform_device *pdev)
goto err_noclk;
}
+ i2c->quirks = s3c24xx_get_device_quirks(pdev);
if (pdata)
memcpy(i2c->pdata, pdata, sizeof(*pdata));
else
@@ -1110,26 +1123,6 @@ static const struct dev_pm_ops s3c24xx_i2c_dev_pm_ops = {
/* device driver for platform bus bits */
-static struct platform_device_id s3c24xx_driver_ids[] = {
- {
- .name = "s3c2410-i2c",
- .driver_data = TYPE_S3C2410,
- }, {
- .name = "s3c2440-i2c",
- .driver_data = TYPE_S3C2440,
- }, { },
-};
-MODULE_DEVICE_TABLE(platform, s3c24xx_driver_ids);
-
-#ifdef CONFIG_OF
-static const struct of_device_id s3c24xx_i2c_match[] = {
- { .compatible = "samsung,s3c2410-i2c" },
- { .compatible = "samsung,s3c2440-i2c" },
- {},
-};
-MODULE_DEVICE_TABLE(of, s3c24xx_i2c_match);
-#endif
-
static struct platform_driver s3c24xx_i2c_driver = {
.probe = s3c24xx_i2c_probe,
.remove = s3c24xx_i2c_remove,
--
1.7.9.5
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists