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mfd mc13892: support reading the revision 

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Sascha Hauer 2010-10-11 09:38:20 +02:00
parent 44f3c38d95
commit c9ec81efa7
2 changed files with 83 additions and 1 deletions
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62
drivers/mfd/mc13892.c
View File

@ -25,6 +25,7 @@
#include <xfuncs.h>
#include <errno.h>
#include <spi/spi.h>
#include <malloc.h>
#include <i2c/i2c.h>
#include <mfd/mc13892.h>
@ -210,8 +211,63 @@ static struct file_operations mc_fops = {
.write = mc_write,
};
struct mc13892_rev {
u16 rev_id;
enum mc13892_revision rev;
char *revstr;
};
static struct mc13892_rev mc13892_revisions[] = {
{ 0x01, MC13892_REVISION_1_0, "1.0" },
{ 0x09, MC13892_REVISION_1_1, "1.1" },
{ 0x0a, MC13892_REVISION_1_2, "1.2" },
{ 0x10, MC13892_REVISION_2_0, "2.0" },
{ 0x11, MC13892_REVISION_2_1, "2.1" },
{ 0x18, MC13892_REVISION_3_0, "3.0" },
{ 0x19, MC13892_REVISION_3_1, "3.1" },
{ 0x1a, MC13892_REVISION_3_2, "3.2" },
{ 0x02, MC13892_REVISION_3_2a, "3.2a" },
{ 0x1b, MC13892_REVISION_3_3, "3.3" },
{ 0x1d, MC13892_REVISION_3_5, "3.5" },
};
static int mc13893_query_revision(struct mc13892 *mc13892)
{
unsigned int rev_id;
char *revstr;
int rev, i;
mc13892_reg_read(mc13892, 7, &rev_id);
for (i = 0; i < ARRAY_SIZE(mc13892_revisions); i++)
if ((rev_id & 0x1f) == mc13892_revisions[i].rev_id)
break;
if (i == ARRAY_SIZE(mc13892_revisions))
return -EINVAL;
rev = mc13892_revisions[i].rev;
revstr = mc13892_revisions[i].revstr;
if (rev == MC13892_REVISION_2_0) {
if ((rev_id >> 9) & 0x3) {
rev = MC13892_REVISION_2_0a;
revstr = "2.0a";
}
}
dev_info(mc_dev->cdev.dev, "PMIC ID: 0x%08x [Rev: %s]\n",
rev_id, revstr);
mc13892->revision = rev;
return rev;
}
static int mc_probe(struct device_d *dev, enum mc13892_mode mode)
{
int rev;
if (mc_dev)
return -EBUSY;
@ -230,6 +286,12 @@ static int mc_probe(struct device_d *dev, enum mc13892_mode mode)
mc_dev->cdev.dev = dev;
mc_dev->cdev.ops = &mc_fops;
rev = mc13893_query_revision(mc_dev);
if (rev < 0) {
free(mc_dev);
return -EINVAL;
}
devfs_create(&mc_dev->cdev);
return 0;

22
include/mfd/mc13892.h
View File

@ -79,6 +79,21 @@ enum mc13892_reg {
MC13892_REG_TEST4 = 0x3f,
};
enum mc13892_revision {
MC13892_REVISION_1_0,
MC13892_REVISION_1_1,
MC13892_REVISION_1_2,
MC13892_REVISION_2_0,
MC13892_REVISION_2_0a,
MC13892_REVISION_2_1,
MC13892_REVISION_3_0,
MC13892_REVISION_3_1,
MC13892_REVISION_3_2,
MC13892_REVISION_3_2a,
MC13892_REVISION_3_3,
MC13892_REVISION_3_5,
};
enum mc13892_mode {
MC13892_MODE_I2C,
MC13892_MODE_SPI,
@ -89,7 +104,7 @@ struct mc13892 {
struct i2c_client *client;
struct spi_device *spi;
enum mc13892_mode mode;
enum mc13892_revision revision;
};
extern struct mc13892 *mc13892_get(void);
@ -98,4 +113,9 @@ extern int mc13892_reg_read(struct mc13892 *mc13892, enum mc13892_reg reg, u32 *
extern int mc13892_reg_write(struct mc13892 *mc13892, enum mc13892_reg reg, u32 val);
extern int mc13892_set_bits(struct mc13892 *mc13892, enum mc13892_reg reg, u32 mask, u32 val);
static inline enum mc13892_revision mc13892_get_revision(struct mc13892 *mc13892)
{
return mc13892->revision;
}
#endif /* __ASM_ARCH_MC13892_H */