V4L/DVB (10867): vino: fold i2c-algo-sgi code into vino.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 194 insertions, 53 deletions

diff --git a/drivers/media/video/vino.c b/drivers/media/video/vino.c
index 96ce68a3dd95..b62e030ba83a 100644
--- a/drivers/media/video/vino.c
+++ b/drivers/media/video/vino.c
@@ -33,7 +33,6 @@
 #include <linux/kmod.h>
 
 #include <linux/i2c.h>
-#include <linux/i2c-algo-sgi.h>
 
 #include <linux/videodev2.h>
 #include <media/v4l2-device.h>
@@ -141,6 +140,20 @@ MODULE_LICENSE("GPL");
 
 #define VINO_DATA_NORM_COUNT            4
 
+/* I2C controller flags */
+#define SGI_I2C_FORCE_IDLE              (0 << 0)
+#define SGI_I2C_NOT_IDLE                (1 << 0)
+#define SGI_I2C_WRITE                   (0 << 1)
+#define SGI_I2C_READ                    (1 << 1)
+#define SGI_I2C_RELEASE_BUS             (0 << 2)
+#define SGI_I2C_HOLD_BUS                (1 << 2)
+#define SGI_I2C_XFER_DONE               (0 << 4)
+#define SGI_I2C_XFER_BUSY               (1 << 4)
+#define SGI_I2C_ACK                     (0 << 5)
+#define SGI_I2C_NACK                    (1 << 5)
+#define SGI_I2C_BUS_OK                  (0 << 7)
+#define SGI_I2C_BUS_ERR                 (1 << 7)
+
 /* Internal data structure definitions */
 
 struct vino_input {
@@ -640,56 +653,6 @@ struct v4l2_queryctrl vino_saa7191_v4l2_controls[] = {
         }
 };
 
-/* VINO I2C bus functions */
-
-unsigned i2c_vino_getctrl(void *data)
-{
-        return vino->i2c_control;
-}
-
-void i2c_vino_setctrl(void *data, unsigned val)
-{
-        vino->i2c_control = val;
-}
-
-unsigned i2c_vino_rdata(void *data)
-{
-        return vino->i2c_data;
-}
-
-void i2c_vino_wdata(void *data, unsigned val)
-{
-        vino->i2c_data = val;
-}
-
-static struct i2c_algo_sgi_data i2c_sgi_vino_data =
-{
-        .getctrl = &i2c_vino_getctrl,
-        .setctrl = &i2c_vino_setctrl,
-        .rdata   = &i2c_vino_rdata,
-        .wdata   = &i2c_vino_wdata,
-        .xfer_timeout = 200,
-        .ack_timeout  = 1000,
-};
-
-static struct i2c_adapter vino_i2c_adapter =
-{
-        .name                   = "VINO I2C bus",
-        .id                     = I2C_HW_SGI_VINO,
-        .algo_data              = &i2c_sgi_vino_data,
-        .owner                  = THIS_MODULE,
-};
-
-static int vino_i2c_add_bus(void)
-{
-        return i2c_sgi_add_bus(&vino_i2c_adapter);
-}
-
-static int vino_i2c_del_bus(void)
-{
-        return i2c_del_adapter(&vino_i2c_adapter);
-}
-
 /* VINO framebuffer/DMA descriptor management */
 
 static void vino_free_buffer_with_count(struct vino_framebuffer *fb,
@@ -1635,6 +1598,184 @@ static inline void vino_set_default_framerate(struct
         vino_set_framerate(vcs, vino_data_norms[vcs->data_norm].fps_max);
 }
 
+/* VINO I2C bus functions */
+
+struct i2c_algo_sgi_data {
+        void *data;     /* private data for lowlevel routines */
+        unsigned (*getctrl)(void *data);
+        void (*setctrl)(void *data, unsigned val);
+        unsigned (*rdata)(void *data);
+        void (*wdata)(void *data, unsigned val);
+
+        int xfer_timeout;
+        int ack_timeout;
+};
+
+static int wait_xfer_done(struct i2c_algo_sgi_data *adap)
+{
+        int i;
+
+        for (i = 0; i < adap->xfer_timeout; i++) {
+                if ((adap->getctrl(adap->data) & SGI_I2C_XFER_BUSY) == 0)
+                        return 0;
+                udelay(1);
+        }
+
+        return -ETIMEDOUT;
+}
+
+static int wait_ack(struct i2c_algo_sgi_data *adap)
+{
+        int i;
+
+        if (wait_xfer_done(adap))
+                return -ETIMEDOUT;
+        for (i = 0; i < adap->ack_timeout; i++) {
+                if ((adap->getctrl(adap->data) & SGI_I2C_NACK) == 0)
+                        return 0;
+                udelay(1);
+        }
+
+        return -ETIMEDOUT;
+}
+
+static int force_idle(struct i2c_algo_sgi_data *adap)
+{
+        int i;
+
+        adap->setctrl(adap->data, SGI_I2C_FORCE_IDLE);
+        for (i = 0; i < adap->xfer_timeout; i++) {
+                if ((adap->getctrl(adap->data) & SGI_I2C_NOT_IDLE) == 0)
+                        goto out;
+                udelay(1);
+        }
+        return -ETIMEDOUT;
+out:
+        if (adap->getctrl(adap->data) & SGI_I2C_BUS_ERR)
+                return -EIO;
+        return 0;
+}
+
+static int do_address(struct i2c_algo_sgi_data *adap, unsigned int addr,
+                      int rd)
+{
+        if (rd)
+                adap->setctrl(adap->data, SGI_I2C_NOT_IDLE);
+        /* Check if bus is idle, eventually force it to do so */
+        if (adap->getctrl(adap->data) & SGI_I2C_NOT_IDLE)
+                if (force_idle(adap))
+                        return -EIO;
+        /* Write out the i2c chip address and specify operation */
+        adap->setctrl(adap->data,
+                      SGI_I2C_HOLD_BUS | SGI_I2C_WRITE | SGI_I2C_NOT_IDLE);
+        if (rd)
+                addr |= 1;
+        adap->wdata(adap->data, addr);
+        if (wait_ack(adap))
+                return -EIO;
+        return 0;
+}
+
+static int i2c_read(struct i2c_algo_sgi_data *adap, unsigned char *buf,
+                    unsigned int len)
+{
+        int i;
+
+        adap->setctrl(adap->data,
+                      SGI_I2C_HOLD_BUS | SGI_I2C_READ | SGI_I2C_NOT_IDLE);
+        for (i = 0; i < len; i++) {
+                if (wait_xfer_done(adap))
+                        return -EIO;
+                buf[i] = adap->rdata(adap->data);
+        }
+        adap->setctrl(adap->data, SGI_I2C_RELEASE_BUS | SGI_I2C_FORCE_IDLE);
+
+        return 0;
+
+}
+
+static int i2c_write(struct i2c_algo_sgi_data *adap, unsigned char *buf,
+                     unsigned int len)
+{
+        int i;
+
+        /* We are already in write state */
+        for (i = 0; i < len; i++) {
+                adap->wdata(adap->data, buf[i]);
+                if (wait_ack(adap))
+                        return -EIO;
+        }
+        return 0;
+}
+
+static int sgi_xfer(struct i2c_adapter *i2c_adap, struct i2c_msg *msgs,
+                    int num)
+{
+        struct i2c_algo_sgi_data *adap = i2c_adap->algo_data;
+        struct i2c_msg *p;
+        int i, err = 0;
+
+        for (i = 0; !err && i < num; i++) {
+                p = &msgs[i];
+                err = do_address(adap, p->addr, p->flags & I2C_M_RD);
+                if (err || !p->len)
+                        continue;
+                if (p->flags & I2C_M_RD)
+                        err = i2c_read(adap, p->buf, p->len);
+                else
+                        err = i2c_write(adap, p->buf, p->len);
+        }
+
+        return (err < 0) ? err : i;
+}
+
+static u32 sgi_func(struct i2c_adapter *adap)
+{
+        return I2C_FUNC_SMBUS_EMUL;
+}
+
+static const struct i2c_algorithm sgi_algo = {
+        .master_xfer    = sgi_xfer,
+        .functionality  = sgi_func,
+};
+
+static unsigned i2c_vino_getctrl(void *data)
+{
+        return vino->i2c_control;
+}
+
+static void i2c_vino_setctrl(void *data, unsigned val)
+{
+        vino->i2c_control = val;
+}
+
+static unsigned i2c_vino_rdata(void *data)
+{
+        return vino->i2c_data;
+}
+
+static void i2c_vino_wdata(void *data, unsigned val)
+{
+        vino->i2c_data = val;
+}
+
+static struct i2c_algo_sgi_data i2c_sgi_vino_data = {
+        .getctrl = &i2c_vino_getctrl,
+        .setctrl = &i2c_vino_setctrl,
+        .rdata   = &i2c_vino_rdata,
+        .wdata   = &i2c_vino_wdata,
+        .xfer_timeout = 200,
+        .ack_timeout  = 1000,
+};
+
+static struct i2c_adapter vino_i2c_adapter = {
+        .name                   = "VINO I2C bus",
+        .id                     = I2C_HW_SGI_VINO,
+        .algo                   = &sgi_algo,
+        .algo_data              = &i2c_sgi_vino_data,
+        .owner                  = THIS_MODULE,
+};
+
 /*
  * Prepare VINO for DMA transfer...
  * (execute only with vino_lock and input_lock locked)
@@ -3999,7 +4140,7 @@ static void vino_module_cleanup(int stage)
                 video_unregister_device(vino_drvdata->a.vdev);
                 vino_drvdata->a.vdev = NULL;
         case 9:
-                vino_i2c_del_bus();
+                i2c_del_adapter(&vino_i2c_adapter);
         case 8:
                 free_irq(SGI_VINO_IRQ, NULL);
         case 7:
@@ -4222,7 +4363,7 @@ static int __init vino_module_init(void)
         }
         vino_init_stage++;
 
-        ret = vino_i2c_add_bus();
+        ret = i2c_add_adapter(&vino_i2c_adapter);
         if (ret) {
                 printk(KERN_ERR "VINO I2C bus registration failed\n");
                 vino_module_cleanup(vino_init_stage);