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authorHeiner Kallweit <hkallweit1@gmail.com>2015-10-29 19:21:38 -0200
committerMauro Carvalho Chehab <mchehab@osg.samsung.com>2015-11-19 09:35:32 -0200
commitb5cf725c04003edc4942057ae479f68826cee909 (patch)
treed490ebbec1f6c3150a55de19c637b82e97416a9a /drivers/media/rc
parent099256e58ef63ba171d5418fdc662e093cdba1be (diff)
[media] media: rc: nuvoton-cir: improve chip detection
Make the chip detection code more similar to the one used for the same chips in watchdog/w83627hf_wdt.c and hwmon/w83627ehf.c. Apart from better maintainability we gain - unified naming of chips (e.g. 677C -> NCT6776F) - driver works with all revisions of the chips (least 4 bits of id are masked) Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
Diffstat (limited to 'drivers/media/rc')
-rw-r--r--drivers/media/rc/nuvoton-cir.c81
-rw-r--r--drivers/media/rc/nuvoton-cir.h24
2 files changed, 56 insertions, 49 deletions
diff --git a/drivers/media/rc/nuvoton-cir.c b/drivers/media/rc/nuvoton-cir.c
index a382e17e976c..c5c238ba5618 100644
--- a/drivers/media/rc/nuvoton-cir.c
+++ b/drivers/media/rc/nuvoton-cir.c
@@ -39,6 +39,17 @@
#include "nuvoton-cir.h"
+static const struct nvt_chip nvt_chips[] = {
+ { "w83667hg", NVT_W83667HG },
+ { "NCT6775F", NVT_6775F },
+ { "NCT6776F", NVT_6776F },
+};
+
+static inline bool is_w83667hg(struct nvt_dev *nvt)
+{
+ return nvt->chip_ver == NVT_W83667HG;
+}
+
/* write val to config reg */
static inline void nvt_cr_write(struct nvt_dev *nvt, u8 val, u8 reg)
{
@@ -224,63 +235,53 @@ static void cir_wake_dump_regs(struct nvt_dev *nvt)
pr_cont("\n");
}
+static inline const char *nvt_find_chip(struct nvt_dev *nvt, int id)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(nvt_chips); i++)
+ if ((id & SIO_ID_MASK) == nvt_chips[i].chip_ver) {
+ nvt->chip_ver = nvt_chips[i].chip_ver;
+ return nvt_chips[i].name;
+ }
+
+ return NULL;
+}
+
+
/* detect hardware features */
static int nvt_hw_detect(struct nvt_dev *nvt)
{
- u8 chip_major, chip_minor;
- char chip_id[12];
- bool chip_unknown = false;
+ const char *chip_name;
+ int chip_id;
nvt_efm_enable(nvt);
/* Check if we're wired for the alternate EFER setup */
- chip_major = nvt_cr_read(nvt, CR_CHIP_ID_HI);
- if (chip_major == 0xff) {
+ nvt->chip_major = nvt_cr_read(nvt, CR_CHIP_ID_HI);
+ if (nvt->chip_major == 0xff) {
nvt->cr_efir = CR_EFIR2;
nvt->cr_efdr = CR_EFDR2;
nvt_efm_enable(nvt);
- chip_major = nvt_cr_read(nvt, CR_CHIP_ID_HI);
+ nvt->chip_major = nvt_cr_read(nvt, CR_CHIP_ID_HI);
}
- chip_minor = nvt_cr_read(nvt, CR_CHIP_ID_LO);
-
- /* these are the known working chip revisions... */
- switch (chip_major) {
- case CHIP_ID_HIGH_667:
- strcpy(chip_id, "w83667hg\0");
- if (chip_minor != CHIP_ID_LOW_667)
- chip_unknown = true;
- break;
- case CHIP_ID_HIGH_677B:
- strcpy(chip_id, "w83677hg\0");
- if (chip_minor != CHIP_ID_LOW_677B2 &&
- chip_minor != CHIP_ID_LOW_677B3)
- chip_unknown = true;
- break;
- case CHIP_ID_HIGH_677C:
- strcpy(chip_id, "w83677hg-c\0");
- if (chip_minor != CHIP_ID_LOW_677C)
- chip_unknown = true;
- break;
- default:
- strcpy(chip_id, "w836x7hg\0");
- chip_unknown = true;
- break;
- }
+ nvt->chip_minor = nvt_cr_read(nvt, CR_CHIP_ID_LO);
+
+ chip_id = nvt->chip_major << 8 | nvt->chip_minor;
+ chip_name = nvt_find_chip(nvt, chip_id);
/* warn, but still let the driver load, if we don't know this chip */
- if (chip_unknown)
- nvt_pr(KERN_WARNING, "%s: unknown chip, id: 0x%02x 0x%02x, "
- "it may not work...", chip_id, chip_major, chip_minor);
+ if (!chip_name)
+ nvt_pr(KERN_WARNING,
+ "unknown chip, id: 0x%02x 0x%02x, it may not work...",
+ nvt->chip_major, nvt->chip_minor);
else
- nvt_dbg("%s: chip id: 0x%02x 0x%02x",
- chip_id, chip_major, chip_minor);
+ nvt_dbg("found %s or compatible: chip id: 0x%02x 0x%02x",
+ chip_name, nvt->chip_major, nvt->chip_minor);
nvt_efm_disable(nvt);
- nvt->chip_major = chip_major;
- nvt->chip_minor = chip_minor;
-
return 0;
}
@@ -288,7 +289,7 @@ static void nvt_cir_ldev_init(struct nvt_dev *nvt)
{
u8 val, psreg, psmask, psval;
- if (nvt->chip_major == CHIP_ID_HIGH_667) {
+ if (is_w83667hg(nvt)) {
psreg = CR_MULTIFUNC_PIN_SEL;
psmask = MULTIFUNC_PIN_SEL_MASK;
psval = MULTIFUNC_ENABLE_CIR | MULTIFUNC_ENABLE_CIRWB;
diff --git a/drivers/media/rc/nuvoton-cir.h b/drivers/media/rc/nuvoton-cir.h
index e1cf23c3875b..81b5a09abd3c 100644
--- a/drivers/media/rc/nuvoton-cir.h
+++ b/drivers/media/rc/nuvoton-cir.h
@@ -64,6 +64,20 @@ static int debug;
#define TX_BUF_LEN 256
#define RX_BUF_LEN 32
+#define SIO_ID_MASK 0xfff0
+
+enum nvt_chip_ver {
+ NVT_UNKNOWN = 0,
+ NVT_W83667HG = 0xa510,
+ NVT_6775F = 0xb470,
+ NVT_6776F = 0xc330
+};
+
+struct nvt_chip {
+ const char *name;
+ enum nvt_chip_ver chip_ver;
+};
+
struct nvt_dev {
struct pnp_dev *pdev;
struct rc_dev *rdev;
@@ -93,6 +107,7 @@ struct nvt_dev {
int cir_irq;
int cir_wake_irq;
+ enum nvt_chip_ver chip_ver;
/* hardware id */
u8 chip_major;
u8 chip_minor;
@@ -326,15 +341,6 @@ struct nvt_dev {
#define EFER_EFM_ENABLE 0x87
#define EFER_EFM_DISABLE 0xaa
-/* Chip IDs found in CR_CHIP_ID_{HI,LO} */
-#define CHIP_ID_HIGH_667 0xa5
-#define CHIP_ID_HIGH_677B 0xb4
-#define CHIP_ID_HIGH_677C 0xc3
-#define CHIP_ID_LOW_667 0x13
-#define CHIP_ID_LOW_677B2 0x72
-#define CHIP_ID_LOW_677B3 0x73
-#define CHIP_ID_LOW_677C 0x33
-
/* Config regs we need to care about */
#define CR_SOFTWARE_RESET 0x02
#define CR_LOGICAL_DEV_SEL 0x07

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