dect
/
linux-2.6
Archived
13
0
Fork 0
Code Releases Activity

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@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
This commit is contained in:
Karol Lewandowski 2012-04-23 18:24:00 +02:00 committed by Wolfram Sang
parent 951eef3955
commit 27452498a6
1 changed files with 36 additions and 43 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

79
drivers/i2c/busses/i2c-s3c2410.c
View File

@ -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. */
/* s3c24xx_i2c_is2440()
*
* return true is this is an s3c2440
*/
static inline int s3c24xx_i2c_is2440(struct s3c24xx_i2c *i2c)
{
struct platform_device *pdev = to_platform_device(i2c->dev);
enum s3c24xx_i2c_type type;
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
if (i2c->dev->of_node)
return of_device_is_compatible(i2c->dev->of_node,
"samsung,s3c2440-i2c");
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
type = platform_get_device_id(pdev)->driver_data;
return type == TYPE_S3C2440;
/* s3c24xx_get_device_quirks
*
* Get controller type either from device tree or platform device variant.
*/
static inline unsigned int s3c24xx_get_device_quirks(struct platform_device *pdev)
{
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;
}
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,