V4L/DVB (10504): tda827x: Be sure that gate will be open/closed at the proper time

The gate control logic is broken: several routines just keep it open;
other rotines close it properly; there are even other routines that
assumes that it is open without really checking or opening it.

Instead of having to manually handle the gate control and having such
troubles, let a sub-routine take care of the gate, opening it before
i2c_transfer and closing it after that. This avoids leaving the gate
into a random state.

Cc: Michael Krufky <mkrufky@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 102 insertions, 81 deletions

diff --git a/drivers/media/common/tuners/tda827x.c b/drivers/media/common/tuners/tda827x.c
index f4d931f14fad..8cd55a83b381 100644
--- a/drivers/media/common/tuners/tda827x.c
+++ b/drivers/media/common/tuners/tda827x.c
@@ -132,11 +132,31 @@ static const struct tda827x_data tda827x_table[] = {
         { .lomax =         0, .spd = 0, .bs = 0, .bp = 0, .cp = 0, .gc3 = 0, .div1p5 = 0}
 };
 
+static int tuner_transfer(struct dvb_frontend *fe,
+                          struct i2c_msg *msg,
+                          const int size)
+{
+        int rc;
+        struct tda827x_priv *priv = fe->tuner_priv;
+
+        if (fe->ops.i2c_gate_ctrl)
+                fe->ops.i2c_gate_ctrl(fe, 1);
+        rc = i2c_transfer(priv->i2c_adap, msg, size);
+        if (fe->ops.i2c_gate_ctrl)
+                fe->ops.i2c_gate_ctrl(fe, 0);
+
+        if (rc >= 0 && rc != size)
+                return -EIO;
+
+        return rc;
+}
+
 static int tda827xo_set_params(struct dvb_frontend *fe,
                                struct dvb_frontend_parameters *params)
 {
         struct tda827x_priv *priv = fe->tuner_priv;
         u8 buf[14];
+        int rc;
 
         struct i2c_msg msg = { .addr = priv->i2c_addr, .flags = 0,
                                .buf = buf, .len = sizeof(buf) };
@@ -183,27 +203,29 @@ static int tda827xo_set_params(struct dvb_frontend *fe,
         buf[13] = 0x40;
 
         msg.len = 14;
-        if (fe->ops.i2c_gate_ctrl)
-                fe->ops.i2c_gate_ctrl(fe, 1);
-        if (i2c_transfer(priv->i2c_adap, &msg, 1) != 1) {
-                printk("%s: could not write to tuner at addr: 0x%02x\n",
-                       __func__, priv->i2c_addr << 1);
-                return -EIO;
-        }
+        rc = tuner_transfer(fe, &msg, 1);
+        if (rc < 0)
+                goto err;
+
         msleep(500);
         /* correct CP value */
         buf[0] = 0x30;
         buf[1] = 0x50 + tda827x_table[i].cp;
         msg.len = 2;
 
-        if (fe->ops.i2c_gate_ctrl)
-                fe->ops.i2c_gate_ctrl(fe, 1);
-        i2c_transfer(priv->i2c_adap, &msg, 1);
+        rc = tuner_transfer(fe, &msg, 1);
+        if (rc < 0)
+                goto err;
 
         priv->frequency = params->frequency;
         priv->bandwidth = (fe->ops.info.type == FE_OFDM) ? params->u.ofdm.bandwidth : 0;
 
         return 0;
+
+err:
+        printk(KERN_ERR "%s: could not write to tuner at addr: 0x%02x\n",
+               __func__, priv->i2c_addr << 1);
+        return rc;
 }
 
 static int tda827xo_sleep(struct dvb_frontend *fe)
@@ -214,9 +236,7 @@ static int tda827xo_sleep(struct dvb_frontend *fe)
                                .buf = buf, .len = sizeof(buf) };
 
         dprintk("%s:\n", __func__);
-        if (fe->ops.i2c_gate_ctrl)
-                fe->ops.i2c_gate_ctrl(fe, 1);
-        i2c_transfer(priv->i2c_adap, &msg, 1);
+        tuner_transfer(fe, &msg, 1);
 
         if (priv->cfg && priv->cfg->sleep)
                 priv->cfg->sleep(fe);
@@ -266,44 +286,44 @@ static int tda827xo_set_analog_params(struct dvb_frontend *fe,
 
         msg.buf = tuner_reg;
         msg.len = 8;
-        i2c_transfer(priv->i2c_adap, &msg, 1);
+        tuner_transfer(fe, &msg, 1);
 
         msg.buf = reg2;
         msg.len = 2;
         reg2[0] = 0x80;
         reg2[1] = 0;
-        i2c_transfer(priv->i2c_adap, &msg, 1);
+        tuner_transfer(fe, &msg, 1);
 
         reg2[0] = 0x60;
         reg2[1] = 0xbf;
-        i2c_transfer(priv->i2c_adap, &msg, 1);
+        tuner_transfer(fe, &msg, 1);
 
         reg2[0] = 0x30;
         reg2[1] = tuner_reg[4] + 0x80;
-        i2c_transfer(priv->i2c_adap, &msg, 1);
+        tuner_transfer(fe, &msg, 1);
 
         msleep(1);
         reg2[0] = 0x30;
         reg2[1] = tuner_reg[4] + 4;
-        i2c_transfer(priv->i2c_adap, &msg, 1);
+        tuner_transfer(fe, &msg, 1);
 
         msleep(1);
         reg2[0] = 0x30;
         reg2[1] = tuner_reg[4];
-        i2c_transfer(priv->i2c_adap, &msg, 1);
+        tuner_transfer(fe, &msg, 1);
 
         msleep(550);
         reg2[0] = 0x30;
         reg2[1] = (tuner_reg[4] & 0xfc) + tda827x_table[i].cp;
-        i2c_transfer(priv->i2c_adap, &msg, 1);
+        tuner_transfer(fe, &msg, 1);
 
         reg2[0] = 0x60;
         reg2[1] = 0x3f;
-        i2c_transfer(priv->i2c_adap, &msg, 1);
+        tuner_transfer(fe, &msg, 1);
 
         reg2[0] = 0x80;
         reg2[1] = 0x08;   /* Vsync en */
-        i2c_transfer(priv->i2c_adap, &msg, 1);
+        tuner_transfer(fe, &msg, 1);
 
         priv->frequency = params->frequency;
 
@@ -317,7 +337,7 @@ static void tda827xo_agcf(struct dvb_frontend *fe)
         struct i2c_msg msg = { .addr = priv->i2c_addr, .flags = 0,
                                .buf = data, .len = 2};
 
-        i2c_transfer(priv->i2c_adap, &msg, 1);
+        tuner_transfer(fe, &msg, 1);
 }
 
 /* ------------------------------------------------------------------ */
@@ -398,13 +418,8 @@ static int tda827xa_sleep(struct dvb_frontend *fe)
                                .buf = buf, .len = sizeof(buf) };
 
         dprintk("%s:\n", __func__);
-        if (fe->ops.i2c_gate_ctrl)
-                fe->ops.i2c_gate_ctrl(fe, 1);
 
-        i2c_transfer(priv->i2c_adap, &msg, 1);
-
-        if (fe->ops.i2c_gate_ctrl)
-                fe->ops.i2c_gate_ctrl(fe, 0);
+        tuner_transfer(fe, &msg, 1);
 
         if (priv->cfg && priv->cfg->sleep)
                 priv->cfg->sleep(fe);
@@ -455,7 +470,7 @@ static void tda827xa_lna_gain(struct dvb_frontend *fe, int high,
                 buf[1] = high ? 0 : 1;
                 if (priv->cfg->config == 2)
                         buf[1] = high ? 1 : 0;
-                i2c_transfer(priv->i2c_adap, &msg, 1);
+                tuner_transfer(fe, &msg, 1);
                 break;
         case 3: /* switch with GPIO of saa713x */
                 if (fe->callback)
@@ -474,7 +489,7 @@ static int tda827xa_set_params(struct dvb_frontend *fe,
         struct i2c_msg msg = { .addr = priv->i2c_addr, .flags = 0,
                                .buf = buf, .len = sizeof(buf) };
 
-        int i, tuner_freq, if_freq;
+        int i, tuner_freq, if_freq, rc;
         u32 N;
 
         dprintk("%s:\n", __func__);
@@ -516,35 +531,32 @@ static int tda827xa_set_params(struct dvb_frontend *fe,
         buf[9] = 0x24;
         buf[10] = 0x00;
         msg.len = 11;
-        if (fe->ops.i2c_gate_ctrl)
-                fe->ops.i2c_gate_ctrl(fe, 1);
-        if (i2c_transfer(priv->i2c_adap, &msg, 1) != 1) {
-                printk("%s: could not write to tuner at addr: 0x%02x\n",
-                       __func__, priv->i2c_addr << 1);
-                return -EIO;
-        }
+        rc = tuner_transfer(fe, &msg, 1);
+        if (rc < 0)
+                goto err;
+
         buf[0] = 0x90;
         buf[1] = 0xff;
         buf[2] = 0x60;
         buf[3] = 0x00;
         buf[4] = 0x59;  // lpsel, for 6MHz + 2
         msg.len = 5;
-        if (fe->ops.i2c_gate_ctrl)
-                fe->ops.i2c_gate_ctrl(fe, 1);
-        i2c_transfer(priv->i2c_adap, &msg, 1);
+        rc = tuner_transfer(fe, &msg, 1);
+        if (rc < 0)
+                goto err;
 
         buf[0] = 0xa0;
         buf[1] = 0x40;
         msg.len = 2;
-        if (fe->ops.i2c_gate_ctrl)
-                fe->ops.i2c_gate_ctrl(fe, 1);
-        i2c_transfer(priv->i2c_adap, &msg, 1);
+        rc = tuner_transfer(fe, &msg, 1);
+        if (rc < 0)
+                goto err;
 
         msleep(11);
         msg.flags = I2C_M_RD;
-        if (fe->ops.i2c_gate_ctrl)
-                fe->ops.i2c_gate_ctrl(fe, 1);
-        i2c_transfer(priv->i2c_adap, &msg, 1);
+        rc = tuner_transfer(fe, &msg, 1);
+        if (rc < 0)
+                goto err;
         msg.flags = 0;
 
         buf[1] >>= 4;
@@ -553,49 +565,55 @@ static int tda827xa_set_params(struct dvb_frontend *fe,
                 tda827xa_lna_gain(fe, 0, NULL);
                 buf[0] = 0x60;
                 buf[1] = 0x0c;
-                if (fe->ops.i2c_gate_ctrl)
-                        fe->ops.i2c_gate_ctrl(fe, 1);
-                i2c_transfer(priv->i2c_adap, &msg, 1);
+                rc = tuner_transfer(fe, &msg, 1);
+                if (rc < 0)
+                        goto err;
         }
 
         buf[0] = 0xc0;
         buf[1] = 0x99;    // lpsel, for 6MHz + 2
-        if (fe->ops.i2c_gate_ctrl)
-                fe->ops.i2c_gate_ctrl(fe, 1);
-        i2c_transfer(priv->i2c_adap, &msg, 1);
+        rc = tuner_transfer(fe, &msg, 1);
+        if (rc < 0)
+                goto err;
 
         buf[0] = 0x60;
         buf[1] = 0x3c;
-        if (fe->ops.i2c_gate_ctrl)
-                fe->ops.i2c_gate_ctrl(fe, 1);
-        i2c_transfer(priv->i2c_adap, &msg, 1);
+        rc = tuner_transfer(fe, &msg, 1);
+        if (rc < 0)
+                goto err;
 
         /* correct CP value */
         buf[0] = 0x30;
         buf[1] = 0x10 + tda827xa_dvbt[i].scr;
-        if (fe->ops.i2c_gate_ctrl)
-                fe->ops.i2c_gate_ctrl(fe, 1);
-        i2c_transfer(priv->i2c_adap, &msg, 1);
+        rc = tuner_transfer(fe, &msg, 1);
+        if (rc < 0)
+                goto err;
 
         msleep(163);
         buf[0] = 0xc0;
         buf[1] = 0x39;  // lpsel, for 6MHz + 2
-        if (fe->ops.i2c_gate_ctrl)
-                fe->ops.i2c_gate_ctrl(fe, 1);
-        i2c_transfer(priv->i2c_adap, &msg, 1);
+        rc = tuner_transfer(fe, &msg, 1);
+        if (rc < 0)
+                goto err;
 
         msleep(3);
         /* freeze AGC1 */
         buf[0] = 0x50;
         buf[1] = 0x4f + (tda827xa_dvbt[i].gc3 << 4);
-        if (fe->ops.i2c_gate_ctrl)
-                fe->ops.i2c_gate_ctrl(fe, 1);
-        i2c_transfer(priv->i2c_adap, &msg, 1);
+        rc = tuner_transfer(fe, &msg, 1);
+        if (rc < 0)
+                goto err;
 
         priv->frequency = params->frequency;
         priv->bandwidth = (fe->ops.info.type == FE_OFDM) ? params->u.ofdm.bandwidth : 0;
 
+
         return 0;
+
+err:
+        printk(KERN_ERR "%s: could not write to tuner at addr: 0x%02x\n",
+               __func__, priv->i2c_addr << 1);
+        return rc;
 }
 
 
@@ -643,7 +661,7 @@ static int tda827xa_set_analog_params(struct dvb_frontend *fe,
         tuner_reg[9] = 0x20;
         tuner_reg[10] = 0x00;
         msg.len = 11;
-        i2c_transfer(priv->i2c_adap, &msg, 1);
+        tuner_transfer(fe, &msg, 1);
 
         tuner_reg[0] = 0x90;
         tuner_reg[1] = 0xff;
@@ -651,19 +669,19 @@ static int tda827xa_set_analog_params(struct dvb_frontend *fe,
         tuner_reg[3] = 0;
         tuner_reg[4] = 0x99 + (priv->lpsel << 1);
         msg.len = 5;
-        i2c_transfer(priv->i2c_adap, &msg, 1);
+        tuner_transfer(fe, &msg, 1);
 
         tuner_reg[0] = 0xa0;
         tuner_reg[1] = 0xc0;
         msg.len = 2;
-        i2c_transfer(priv->i2c_adap, &msg, 1);
+        tuner_transfer(fe, &msg, 1);
 
         tuner_reg[0] = 0x30;
         tuner_reg[1] = 0x10 + tda827xa_analog[i].scr;
-        i2c_transfer(priv->i2c_adap, &msg, 1);
+        tuner_transfer(fe, &msg, 1);
 
         msg.flags = I2C_M_RD;
-        i2c_transfer(priv->i2c_adap, &msg, 1);
+        tuner_transfer(fe, &msg, 1);
         msg.flags = 0;
         tuner_reg[1] >>= 4;
         dprintk("AGC2 gain is: %d\n", tuner_reg[1]);
@@ -673,24 +691,24 @@ static int tda827xa_set_analog_params(struct dvb_frontend *fe,
         msleep(100);
         tuner_reg[0] = 0x60;
         tuner_reg[1] = 0x3c;
-        i2c_transfer(priv->i2c_adap, &msg, 1);
+        tuner_transfer(fe, &msg, 1);
 
         msleep(163);
         tuner_reg[0] = 0x50;
         tuner_reg[1] = 0x8f + (tda827xa_analog[i].gc3 << 4);
-        i2c_transfer(priv->i2c_adap, &msg, 1);
+        tuner_transfer(fe, &msg, 1);
 
         tuner_reg[0] = 0x80;
         tuner_reg[1] = 0x28;
-        i2c_transfer(priv->i2c_adap, &msg, 1);
+        tuner_transfer(fe, &msg, 1);
 
         tuner_reg[0] = 0xb0;
         tuner_reg[1] = 0x01;
-        i2c_transfer(priv->i2c_adap, &msg, 1);
+        tuner_transfer(fe, &msg, 1);
 
         tuner_reg[0] = 0xc0;
         tuner_reg[1] = 0x19 + (priv->lpsel << 1);
-        i2c_transfer(priv->i2c_adap, &msg, 1);
+        tuner_transfer(fe, &msg, 1);
 
         priv->frequency = params->frequency;
 
@@ -703,7 +721,7 @@ static void tda827xa_agcf(struct dvb_frontend *fe)
         unsigned char data[] = {0x80, 0x2c};
         struct i2c_msg msg = {.addr = priv->i2c_addr, .flags = 0,
                               .buf = data, .len = 2};
-        i2c_transfer(priv->i2c_adap, &msg, 1);
+        tuner_transfer(fe, &msg, 1);
 }
 
 /* ------------------------------------------------------------------ */
@@ -792,16 +810,19 @@ static struct dvb_tuner_ops tda827xa_tuner_ops = {
 };
 
 static int tda827x_probe_version(struct dvb_frontend *fe)
-{       u8 data;
+{
+        u8 data;
+        int rc;
         struct tda827x_priv *priv = fe->tuner_priv;
         struct i2c_msg msg = { .addr = priv->i2c_addr, .flags = I2C_M_RD,
                                .buf = &data, .len = 1 };
-        if (fe->ops.i2c_gate_ctrl)
-                fe->ops.i2c_gate_ctrl(fe, 1);
-        if (i2c_transfer(priv->i2c_adap, &msg, 1) != 1) {
+
+        rc = tuner_transfer(fe, &msg, 1);
+
+        if (rc < 0) {
                 printk("%s: could not read from tuner at addr: 0x%02x\n",
                        __func__, msg.addr << 1);
-                return -EIO;
+                return rc;
         }
         if ((data & 0x3c) == 0) {
                 dprintk("tda827x tuner found\n");