Merge branch 'i2c/for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa...

[deliverable/linux.git] / drivers / i2c / busses / i2c-rcar.c

diff --git a/drivers/i2c/busses/i2c-rcar.c b/drivers/i2c/busses/i2c-rcar.c
index 4c46d1b1b61d4deaf878f14bb7e22940b6a30068..8994059236786e88b42185b3edbe916b3fb98bd8 100644 (file)
--- a/drivers/i2c/busses/i2c-rcar.c
+++ b/drivers/i2c/busses/i2c-rcar.c
@@ -1,7 +1,9 @@
 /*
- *  drivers/i2c/busses/i2c-rcar.c
+ * Driver for the Renesas RCar I2C unit
  *
- * Copyright (C) 2012 Renesas Solutions Corp.
+ * Copyright (C) 2014 Wolfram Sang <wsa@sang-engineering.com>
+ *
+ * Copyright (C) 2012-14 Renesas Solutions Corp.
  * Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
  *
  * This file is based on the drivers/i2c/busses/i2c-sh7760.c
@@ -12,16 +14,12 @@
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License
+ * the Free Software Foundation; version 2 of the License.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  */
 #include <linux/clk.h>
 #include <linux/delay.h>
@@ -80,9 +78,6 @@
 #define RCAR_IRQ_ACK_SEND      (~(MAT | MDE))
 #define RCAR_IRQ_ACK_RECV      (~(MAT | MDR))
 
-/*
- * flags
- */
 #define ID_LAST_MSG    (1 << 0)
 #define ID_IOERROR     (1 << 1)
 #define ID_DONE                (1 << 2)
@@ -105,7 +100,7 @@ struct rcar_i2c_priv {
        int pos;
        u32 icccr;
        u32 flags;
-       enum rcar_i2c_type      devtype;
+       enum rcar_i2c_type devtype;
 };
 
 #define rcar_i2c_priv_to_dev(p)                ((p)->adap.dev.parent)
@@ -116,9 +111,7 @@ struct rcar_i2c_priv {
 
 #define LOOP_TIMEOUT   1024
 
-/*
- *             basic functions
- */
+
 static void rcar_i2c_write(struct rcar_i2c_priv *priv, int reg, u32 val)
 {
        writel(val, priv->io + reg);
@@ -147,9 +140,6 @@ static void rcar_i2c_init(struct rcar_i2c_priv *priv)
        rcar_i2c_write(priv, ICMAR, 0);
 }
 
-/*
- *             bus control functions
- */
 static int rcar_i2c_bus_barrier(struct rcar_i2c_priv *priv)
 {
        int i;
@@ -164,9 +154,6 @@ static int rcar_i2c_bus_barrier(struct rcar_i2c_priv *priv)
        return -EBUSY;
 }
 
-/*
- *             clock function
- */
 static int rcar_i2c_clock_calculate(struct rcar_i2c_priv *priv,
                                    u32 bus_speed,
                                    struct device *dev)
@@ -256,10 +243,6 @@ scgd_find:
        return 0;
 }
 
-/*
- *             status functions
- */
-
 static int rcar_i2c_prepare_msg(struct rcar_i2c_priv *priv)
 {
        int read = !!rcar_i2c_is_recv(priv);
@@ -380,40 +363,24 @@ static int rcar_i2c_irq_recv(struct rcar_i2c_priv *priv, u32 msr)
 static irqreturn_t rcar_i2c_irq(int irq, void *ptr)
 {
        struct rcar_i2c_priv *priv = ptr;
-       struct device *dev = rcar_i2c_priv_to_dev(priv);
        u32 msr;
 
        msr = rcar_i2c_read(priv, ICMSR);
 
-       /*
-        * Arbitration lost
-        */
+       /* Arbitration lost */
        if (msr & MAL) {
-               /*
-                * CAUTION
-                *
-                * When arbitration lost, device become _slave_ mode.
-                */
-               dev_dbg(dev, "Arbitration Lost\n");
                rcar_i2c_flags_set(priv, (ID_DONE | ID_ARBLOST));
                goto out;
        }
 
-       /*
-        * Stop
-        */
+       /* Stop */
        if (msr & MST) {
-               dev_dbg(dev, "Stop\n");
                rcar_i2c_flags_set(priv, ID_DONE);
                goto out;
        }
 
-       /*
-        * Nack
-        */
+       /* Nack */
        if (msr & MNR) {
-               dev_dbg(dev, "Nack\n");
-
                /* go to stop phase */
                rcar_i2c_write(priv, ICMCR, RCAR_BUS_PHASE_STOP);
                rcar_i2c_write(priv, ICMIER, RCAR_IRQ_STOP);
@@ -421,9 +388,6 @@ static irqreturn_t rcar_i2c_irq(int irq, void *ptr)
                goto out;
        }
 
-       /*
-        * recv/send
-        */
        if (rcar_i2c_is_recv(priv))
                rcar_i2c_flags_set(priv, rcar_i2c_irq_recv(priv, msr));
        else
@@ -476,9 +440,6 @@ static int rcar_i2c_master_xfer(struct i2c_adapter *adap,
                if (ret < 0)
                        break;
 
-               /*
-                * wait result
-                */
                timeout = wait_event_timeout(priv->wait,
                                             rcar_i2c_flags_has(priv, ID_DONE),
                                             5 * HZ);
@@ -487,9 +448,6 @@ static int rcar_i2c_master_xfer(struct i2c_adapter *adap,
                        break;
                }
 
-               /*
-                * error handling
-                */
                if (rcar_i2c_flags_has(priv, ID_NACK)) {
                        ret = -ENXIO;
                        break;
@@ -551,10 +509,8 @@ static int rcar_i2c_probe(struct platform_device *pdev)
        int irq, ret;
 
        priv = devm_kzalloc(dev, sizeof(struct rcar_i2c_priv), GFP_KERNEL);
-       if (!priv) {
-               dev_err(dev, "no mem for private data\n");
+       if (!priv)
                return -ENOMEM;
-       }
 
        priv->clk = devm_clk_get(dev, NULL);
        if (IS_ERR(priv->clk)) {
@@ -648,6 +604,6 @@ static struct platform_driver rcar_i2c_driver = {
 
 module_platform_driver(rcar_i2c_driver);
 
-MODULE_LICENSE("GPL");
+MODULE_LICENSE("GPL v2");
 MODULE_DESCRIPTION("Renesas R-Car I2C bus driver");
 MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>");