From b5cf725c04003edc4942057ae479f68826cee909 Mon Sep 17 00:00:00 2001 From: Heiner Kallweit Date: Thu, 29 Oct 2015 19:21:38 -0200 Subject: [PATCH] [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 Signed-off-by: Mauro Carvalho Chehab --- drivers/media/rc/nuvoton-cir.c | 81 +++++++++++++++++----------------- drivers/media/rc/nuvoton-cir.h | 24 ++++++---- 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 -- 2.20.1