sfc: Use kernel I2C system and i2c-algo-bit driver

Remove our own implementation of I2C bit-banging.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>

1 files changed, 66 insertions, 60 deletions

diff --git a/drivers/net/sfc/sfe4001.c b/drivers/net/sfc/sfe4001.c
index 66a0d1442aba..b27849523990 100644
--- a/drivers/net/sfc/sfe4001.c
+++ b/drivers/net/sfc/sfe4001.c
@@ -106,28 +106,27 @@
 
 static const u8 xgphy_max_temperature = 90;
 
-void sfe4001_poweroff(struct efx_nic *efx)
+static void sfe4001_poweroff(struct efx_nic *efx)
 {
-        struct efx_i2c_interface *i2c = &efx->i2c;
+        struct i2c_client *ioexp_client = efx->board_info.ioexp_client;
+        struct i2c_client *hwmon_client = efx->board_info.hwmon_client;
 
-        u8 cfg, out, in;
+        /* Turn off all power rails and disable outputs */
+        i2c_smbus_write_byte_data(ioexp_client, P0_OUT, 0xff);
+        i2c_smbus_write_byte_data(ioexp_client, P1_CONFIG, 0xff);
+        i2c_smbus_write_byte_data(ioexp_client, P0_CONFIG, 0xff);
 
-        EFX_INFO(efx, "%s\n", __func__);
-
-        /* Turn off all power rails */
-        out = 0xff;
-        efx_i2c_write(i2c, PCA9539, P0_OUT, &out, 1);
-
-        /* Disable port 1 outputs on IO expander */
-        cfg = 0xff;
-        efx_i2c_write(i2c, PCA9539, P1_CONFIG, &cfg, 1);
+        /* Clear any over-temperature alert */
+        i2c_smbus_read_byte_data(hwmon_client, RSL);
+}
 
-        /* Disable port 0 outputs on IO expander */
-        cfg = 0xff;
-        efx_i2c_write(i2c, PCA9539, P0_CONFIG, &cfg, 1);
+static void sfe4001_fini(struct efx_nic *efx)
+{
+        EFX_INFO(efx, "%s\n", __func__);
 
-        /* Clear any over-temperature alert */
-        efx_i2c_read(i2c, MAX6647, RSL, &in, 1);
+        sfe4001_poweroff(efx);
+        i2c_unregister_device(efx->board_info.ioexp_client);
+        i2c_unregister_device(efx->board_info.hwmon_client);
 }
 
 /* The P0_EN_3V3X line on SFE4001 boards (from A2 onward) is connected
@@ -143,14 +142,26 @@ MODULE_PARM_DESC(phy_flash_cfg,
  * be turned on before the PHY can be used.
  * Context: Process context, rtnl lock held
  */
-int sfe4001_poweron(struct efx_nic *efx)
+int sfe4001_init(struct efx_nic *efx)
 {
-        struct efx_i2c_interface *i2c = &efx->i2c;
+        struct i2c_client *hwmon_client, *ioexp_client;
         unsigned int count;
         int rc;
-        u8 out, in, cfg;
+        u8 out;
         efx_dword_t reg;
 
+        hwmon_client = i2c_new_dummy(&efx->i2c_adap, MAX6647);
+        if (!hwmon_client)
+                return -EIO;
+        efx->board_info.hwmon_client = hwmon_client;
+
+        ioexp_client = i2c_new_dummy(&efx->i2c_adap, PCA9539);
+        if (!ioexp_client) {
+                rc = -EIO;
+                goto fail_hwmon;
+        }
+        efx->board_info.ioexp_client = ioexp_client;
+
         /* 10Xpress has fixed-function LED pins, so there is no board-specific
          * blink code. */
         efx->board_info.blink = tenxpress_phy_blink;
@@ -166,44 +177,45 @@ int sfe4001_poweron(struct efx_nic *efx)
         falcon_xmac_writel(efx, &reg, XX_PWR_RST_REG_MAC);
         udelay(10);
 
+        efx->board_info.fini = sfe4001_fini;
+
         /* Set DSP over-temperature alert threshold */
         EFX_INFO(efx, "DSP cut-out at %dC\n", xgphy_max_temperature);
-        rc = efx_i2c_write(i2c, MAX6647, WLHO,
-                           &xgphy_max_temperature, 1);
+        rc = i2c_smbus_write_byte_data(hwmon_client, WLHO,
+                                       xgphy_max_temperature);
         if (rc)
-                goto fail1;
+                goto fail_ioexp;
 
         /* Read it back and verify */
-        rc = efx_i2c_read(i2c, MAX6647, RLHN, &in, 1);
-        if (rc)
-                goto fail1;
-        if (in != xgphy_max_temperature) {
+        rc = i2c_smbus_read_byte_data(hwmon_client, RLHN);
+        if (rc < 0)
+                goto fail_ioexp;
+        if (rc != xgphy_max_temperature) {
                 rc = -EFAULT;
-                goto fail1;
+                goto fail_ioexp;
         }
 
         /* Clear any previous over-temperature alert */
-        rc = efx_i2c_read(i2c, MAX6647, RSL, &in, 1);
-        if (rc)
-                goto fail1;
+        rc = i2c_smbus_read_byte_data(hwmon_client, RSL);
+        if (rc < 0)
+                goto fail_ioexp;
 
         /* Enable port 0 and port 1 outputs on IO expander */
-        cfg = 0x00;
-        rc = efx_i2c_write(i2c, PCA9539, P0_CONFIG, &cfg, 1);
+        rc = i2c_smbus_write_byte_data(ioexp_client, P0_CONFIG, 0x00);
         if (rc)
-                goto fail1;
-        cfg = 0xff & ~(1 << P1_SPARE_LBN);
-        rc = efx_i2c_write(i2c, PCA9539, P1_CONFIG, &cfg, 1);
+                goto fail_ioexp;
+        rc = i2c_smbus_write_byte_data(ioexp_client, P1_CONFIG,
+                                       0xff & ~(1 << P1_SPARE_LBN));
         if (rc)
-                goto fail2;
+                goto fail_on;
 
         /* Turn all power off then wait 1 sec. This ensures PHY is reset */
         out = 0xff & ~((0 << P0_EN_1V2_LBN) | (0 << P0_EN_2V5_LBN) |
                        (0 << P0_EN_3V3X_LBN) | (0 << P0_EN_5V_LBN) |
                        (0 << P0_EN_1V0X_LBN));
-        rc = efx_i2c_write(i2c, PCA9539, P0_OUT, &out, 1);
+        rc = i2c_smbus_write_byte_data(ioexp_client, P0_OUT, out);
         if (rc)
-                goto fail3;
+                goto fail_on;
 
         schedule_timeout_uninterruptible(HZ);
         count = 0;
@@ -215,26 +227,26 @@ int sfe4001_poweron(struct efx_nic *efx)
                 if (sfe4001_phy_flash_cfg)
                         out |= 1 << P0_EN_3V3X_LBN;
 
-                rc = efx_i2c_write(i2c, PCA9539, P0_OUT, &out, 1);
+                rc = i2c_smbus_write_byte_data(ioexp_client, P0_OUT, out);
                 if (rc)
-                        goto fail3;
+                        goto fail_on;
                 msleep(10);
 
                 /* Turn on 1V power rail */
                 out &= ~(1 << P0_EN_1V0X_LBN);
-                rc = efx_i2c_write(i2c, PCA9539, P0_OUT, &out, 1);
+                rc = i2c_smbus_write_byte_data(ioexp_client, P0_OUT, out);
                 if (rc)
-                        goto fail3;
+                        goto fail_on;
 
                 EFX_INFO(efx, "waiting for power (attempt %d)...\n", count);
 
                 schedule_timeout_uninterruptible(HZ);
 
                 /* Check DSP is powered */
-                rc = efx_i2c_read(i2c, PCA9539, P1_IN, &in, 1);
-                if (rc)
-                        goto fail3;
-                if (in & (1 << P1_AFE_PWD_LBN))
+                rc = i2c_smbus_read_byte_data(ioexp_client, P1_IN);
+                if (rc < 0)
+                        goto fail_on;
+                if (rc & (1 << P1_AFE_PWD_LBN))
                         goto done;
 
                 /* DSP doesn't look powered in flash config mode */
@@ -244,23 +256,17 @@ int sfe4001_poweron(struct efx_nic *efx)
 
         EFX_INFO(efx, "timed out waiting for power\n");
         rc = -ETIMEDOUT;
-        goto fail3;
+        goto fail_on;
 
 done:
         EFX_INFO(efx, "PHY is powered on\n");
         return 0;
 
-fail3:
-        /* Turn off all power rails */
-        out = 0xff;
-        efx_i2c_write(i2c, PCA9539, P0_OUT, &out, 1);
-        /* Disable port 1 outputs on IO expander */
-        out = 0xff;
-        efx_i2c_write(i2c, PCA9539, P1_CONFIG, &out, 1);
-fail2:
-        /* Disable port 0 outputs on IO expander */
-        out = 0xff;
-        efx_i2c_write(i2c, PCA9539, P0_CONFIG, &out, 1);
-fail1:
+fail_on:
+        sfe4001_poweroff(efx);
+fail_ioexp:
+        i2c_unregister_device(ioexp_client);
+fail_hwmon:
+        i2c_unregister_device(hwmon_client);
         return rc;
 }