[PATCH v3 1/6] net: phy: spi_ks8995: introduce spi_device_id table

[Helmut Buchsbaum]

Refactor to use spi_device_id table to facilitate easy
extendability.

Signed-off-by: Helmut Buchsbaum <helmut.buchsb...@gmail.com>
---
 drivers/net/phy/spi_ks8995.c | 42 ++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 40 insertions(+), 2 deletions(-)

diff --git a/drivers/net/phy/spi_ks8995.c b/drivers/net/phy/spi_ks8995.c
index f091d69..e848ad9 100644
--- a/drivers/net/phy/spi_ks8995.c
+++ b/drivers/net/phy/spi_ks8995.c
@@ -89,6 +89,28 @@
 
 #define KS8995_RESET_DELAY     10 /* usec */
 
+enum ks8995_chip_variant {
+       ks8995,
+       ksz8864,
+       max_variant
+};
+
+struct ks8995_chip_params {
+       char *name;
+       int regs_size;
+};
+
+static const struct ks8995_chip_params ks8995_chip[] = {
+       [ks8995] = {
+               .name = "KS8995MA",
+               .regs_size = KS8995_REGS_SIZE,
+       },
+       [ksz8864] = {
+               .name = "KSZ8864RMN",
+               .regs_size = KSZ8864_REGS_SIZE,
+       },
+};
+
 struct ks8995_pdata {
        /* not yet implemented */
 };
@@ -98,8 +120,16 @@ struct ks8995_switch {
        struct mutex            lock;
        struct ks8995_pdata     *pdata;
        struct bin_attribute    regs_attr;
+       const struct ks8995_chip_params *chip;
 };
 
+static const struct spi_device_id ks8995_id[] = {
+       {"ks8995", ks8995},
+       {"ksz8864", ksz8864},
+       { }
+};
+MODULE_DEVICE_TABLE(spi, ks8995_id);
+
 static inline u8 get_chip_id(u8 val)
 {
        return (val >> ID1_CHIPID_S) & ID1_CHIPID_M;
@@ -244,17 +274,22 @@ static const struct bin_attribute ks8995_registers_attr = 
{
 };
 
 /* ------------------------------------------------------------------------ */
-
 static int ks8995_probe(struct spi_device *spi)
 {
        struct ks8995_switch    *ks;
        struct ks8995_pdata     *pdata;
        u8      ids[2];
        int     err;
+       int variant = spi_get_device_id(spi)->driver_data;
 
        /* Chip description */
        pdata = spi->dev.platform_data;
 
+       if (variant >= max_variant) {
+               dev_err(&spi->dev, "bad chip variant %d\n", variant);
+               return -ENODEV;
+       }
+
        ks = devm_kzalloc(&spi->dev, sizeof(*ks), GFP_KERNEL);
        if (!ks)
                return -ENOMEM;
@@ -262,6 +297,8 @@ static int ks8995_probe(struct spi_device *spi)
        mutex_init(&ks->lock);
        ks->pdata = pdata;
        ks->spi = spi_dev_get(spi);
+       ks->chip = &ks8995_chip[variant];
+
        spi_set_drvdata(spi, ks);
 
        spi->mode = SPI_MODE_0;
@@ -287,6 +324,7 @@ static int ks8995_probe(struct spi_device *spi)
                return -ENODEV;
        }
 
+       ks->regs_attr.size = ks->chip->regs_size;
        memcpy(&ks->regs_attr, &ks8995_registers_attr, sizeof(ks->regs_attr));
        if (get_chip_id(ids[1]) != CHIPID_M) {
                u8 val;
@@ -303,7 +341,6 @@ static int ks8995_probe(struct spi_device *spi)
                        dev_err(&spi->dev, "unknown chip:%02x,0\n", ids[1]);
                        return err;
                }
-               ks->regs_attr.size = KSZ8864_REGS_SIZE;
        }
 
        err = ks8995_reset(ks);
@@ -347,6 +384,7 @@ static struct spi_driver ks8995_driver = {
        },
        .probe    = ks8995_probe,
        .remove   = ks8995_remove,
+       .id_table = ks8995_id,
 };
 
 module_spi_driver(ks8995_driver);
-- 
2.1.4