[media] e4000: convert to Regmap API

That comes possible after driver was converted to kernel I2C model
(I2C binding & proper I2C client with no gate control hack). All
nasty low level I2C routines are now covered by regmap.

Cc: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

1 files changed, 65 insertions, 147 deletions

diff --git a/drivers/media/tuners/e4000.c b/drivers/media/tuners/e4000.c
index 29f73f61f5d3..f382b90f98b7 100644
--- a/drivers/media/tuners/e4000.c
+++ b/drivers/media/tuners/e4000.c
@@ -21,97 +21,6 @@
 #include "e4000_priv.h"
 #include <linux/math64.h>
 
-/* Max transfer size done by I2C transfer functions */
-#define MAX_XFER_SIZE  64
-
-/* write multiple registers */
-static int e4000_wr_regs(struct e4000_priv *priv, u8 reg, u8 *val, int len)
-{
-        int ret;
-        u8 buf[MAX_XFER_SIZE];
-        struct i2c_msg msg[1] = {
-                {
-                        .addr = priv->client->addr,
-                        .flags = 0,
-                        .len = 1 + len,
-                        .buf = buf,
-                }
-        };
-
-        if (1 + len > sizeof(buf)) {
-                dev_warn(&priv->client->dev,
-                         "%s: i2c wr reg=%04x: len=%d is too big!\n",
-                         KBUILD_MODNAME, reg, len);
-                return -EINVAL;
-        }
-
-        buf[0] = reg;
-        memcpy(&buf[1], val, len);
-
-        ret = i2c_transfer(priv->client->adapter, msg, 1);
-        if (ret == 1) {
-                ret = 0;
-        } else {
-                dev_warn(&priv->client->dev,
-                                "%s: i2c wr failed=%d reg=%02x len=%d\n",
-                                KBUILD_MODNAME, ret, reg, len);
-                ret = -EREMOTEIO;
-        }
-        return ret;
-}
-
-/* read multiple registers */
-static int e4000_rd_regs(struct e4000_priv *priv, u8 reg, u8 *val, int len)
-{
-        int ret;
-        u8 buf[MAX_XFER_SIZE];
-        struct i2c_msg msg[2] = {
-                {
-                        .addr = priv->client->addr,
-                        .flags = 0,
-                        .len = 1,
-                        .buf = &reg,
-                }, {
-                        .addr = priv->client->addr,
-                        .flags = I2C_M_RD,
-                        .len = len,
-                        .buf = buf,
-                }
-        };
-
-        if (len > sizeof(buf)) {
-                dev_warn(&priv->client->dev,
-                         "%s: i2c rd reg=%04x: len=%d is too big!\n",
-                         KBUILD_MODNAME, reg, len);
-                return -EINVAL;
-        }
-
-        ret = i2c_transfer(priv->client->adapter, msg, 2);
-        if (ret == 2) {
-                memcpy(val, buf, len);
-                ret = 0;
-        } else {
-                dev_warn(&priv->client->dev,
-                                "%s: i2c rd failed=%d reg=%02x len=%d\n",
-                                KBUILD_MODNAME, ret, reg, len);
-                ret = -EREMOTEIO;
-        }
-
-        return ret;
-}
-
-/* write single register */
-static int e4000_wr_reg(struct e4000_priv *priv, u8 reg, u8 val)
-{
-        return e4000_wr_regs(priv, reg, &val, 1);
-}
-
-/* read single register */
-static int e4000_rd_reg(struct e4000_priv *priv, u8 reg, u8 *val)
-{
-        return e4000_rd_regs(priv, reg, val, 1);
-}
-
 static int e4000_init(struct dvb_frontend *fe)
 {
         struct e4000_priv *priv = fe->tuner_priv;
@@ -120,58 +29,58 @@ static int e4000_init(struct dvb_frontend *fe)
         dev_dbg(&priv->client->dev, "%s:\n", __func__);
 
         /* dummy I2C to ensure I2C wakes up */
-        ret = e4000_wr_reg(priv, 0x02, 0x40);
+        ret = regmap_write(priv->regmap, 0x02, 0x40);
 
         /* reset */
-        ret = e4000_wr_reg(priv, 0x00, 0x01);
+        ret = regmap_write(priv->regmap, 0x00, 0x01);
         if (ret < 0)
                 goto err;
 
         /* disable output clock */
-        ret = e4000_wr_reg(priv, 0x06, 0x00);
+        ret = regmap_write(priv->regmap, 0x06, 0x00);
         if (ret < 0)
                 goto err;
 
-        ret = e4000_wr_reg(priv, 0x7a, 0x96);
+        ret = regmap_write(priv->regmap, 0x7a, 0x96);
         if (ret < 0)
                 goto err;
 
         /* configure gains */
-        ret = e4000_wr_regs(priv, 0x7e, "\x01\xfe", 2);
+        ret = regmap_bulk_write(priv->regmap, 0x7e, "\x01\xfe", 2);
         if (ret < 0)
                 goto err;
 
-        ret = e4000_wr_reg(priv, 0x82, 0x00);
+        ret = regmap_write(priv->regmap, 0x82, 0x00);
         if (ret < 0)
                 goto err;
 
-        ret = e4000_wr_reg(priv, 0x24, 0x05);
+        ret = regmap_write(priv->regmap, 0x24, 0x05);
         if (ret < 0)
                 goto err;
 
-        ret = e4000_wr_regs(priv, 0x87, "\x20\x01", 2);
+        ret = regmap_bulk_write(priv->regmap, 0x87, "\x20\x01", 2);
         if (ret < 0)
                 goto err;
 
-        ret = e4000_wr_regs(priv, 0x9f, "\x7f\x07", 2);
+        ret = regmap_bulk_write(priv->regmap, 0x9f, "\x7f\x07", 2);
         if (ret < 0)
                 goto err;
 
         /* DC offset control */
-        ret = e4000_wr_reg(priv, 0x2d, 0x1f);
+        ret = regmap_write(priv->regmap, 0x2d, 0x1f);
         if (ret < 0)
                 goto err;
 
-        ret = e4000_wr_regs(priv, 0x70, "\x01\x01", 2);
+        ret = regmap_bulk_write(priv->regmap, 0x70, "\x01\x01", 2);
         if (ret < 0)
                 goto err;
 
         /* gain control */
-        ret = e4000_wr_reg(priv, 0x1a, 0x17);
+        ret = regmap_write(priv->regmap, 0x1a, 0x17);
         if (ret < 0)
                 goto err;
 
-        ret = e4000_wr_reg(priv, 0x1f, 0x1a);
+        ret = regmap_write(priv->regmap, 0x1f, 0x1a);
         if (ret < 0)
                 goto err;
 
@@ -192,7 +101,7 @@ static int e4000_sleep(struct dvb_frontend *fe)
 
         priv->active = false;
 
-        ret = e4000_wr_reg(priv, 0x00, 0x00);
+        ret = regmap_write(priv->regmap, 0x00, 0x00);
         if (ret < 0)
                 goto err;
 err:
@@ -216,7 +125,7 @@ static int e4000_set_params(struct dvb_frontend *fe)
                         c->bandwidth_hz);
 
         /* gain control manual */
-        ret = e4000_wr_reg(priv, 0x1a, 0x00);
+        ret = regmap_write(priv->regmap, 0x1a, 0x00);
         if (ret < 0)
                 goto err;
 
@@ -243,7 +152,7 @@ static int e4000_set_params(struct dvb_frontend *fe)
                         "%s: f_vco=%llu pll div=%d sigma_delta=%04x\n",
                         __func__, f_vco, buf[0], sigma_delta);
 
-        ret = e4000_wr_regs(priv, 0x09, buf, 5);
+        ret = regmap_bulk_write(priv->regmap, 0x09, buf, 5);
         if (ret < 0)
                 goto err;
 
@@ -258,7 +167,7 @@ static int e4000_set_params(struct dvb_frontend *fe)
                 goto err;
         }
 
-        ret = e4000_wr_reg(priv, 0x10, e400_lna_filter_lut[i].val);
+        ret = regmap_write(priv->regmap, 0x10, e400_lna_filter_lut[i].val);
         if (ret < 0)
                 goto err;
 
@@ -276,7 +185,7 @@ static int e4000_set_params(struct dvb_frontend *fe)
         buf[0] = e4000_if_filter_lut[i].reg11_val;
         buf[1] = e4000_if_filter_lut[i].reg12_val;
 
-        ret = e4000_wr_regs(priv, 0x11, buf, 2);
+        ret = regmap_bulk_write(priv->regmap, 0x11, buf, 2);
         if (ret < 0)
                 goto err;
 
@@ -291,33 +200,33 @@ static int e4000_set_params(struct dvb_frontend *fe)
                 goto err;
         }
 
-        ret = e4000_wr_reg(priv, 0x07, e4000_band_lut[i].reg07_val);
+        ret = regmap_write(priv->regmap, 0x07, e4000_band_lut[i].reg07_val);
         if (ret < 0)
                 goto err;
 
-        ret = e4000_wr_reg(priv, 0x78, e4000_band_lut[i].reg78_val);
+        ret = regmap_write(priv->regmap, 0x78, e4000_band_lut[i].reg78_val);
         if (ret < 0)
                 goto err;
 
         /* DC offset */
         for (i = 0; i < 4; i++) {
                 if (i == 0)
-                        ret = e4000_wr_regs(priv, 0x15, "\x00\x7e\x24", 3);
+                        ret = regmap_bulk_write(priv->regmap, 0x15, "\x00\x7e\x24", 3);
                 else if (i == 1)
-                        ret = e4000_wr_regs(priv, 0x15, "\x00\x7f", 2);
+                        ret = regmap_bulk_write(priv->regmap, 0x15, "\x00\x7f", 2);
                 else if (i == 2)
-                        ret = e4000_wr_regs(priv, 0x15, "\x01", 1);
+                        ret = regmap_bulk_write(priv->regmap, 0x15, "\x01", 1);
                 else
-                        ret = e4000_wr_regs(priv, 0x16, "\x7e", 1);
+                        ret = regmap_bulk_write(priv->regmap, 0x16, "\x7e", 1);
 
                 if (ret < 0)
                         goto err;
 
-                ret = e4000_wr_reg(priv, 0x29, 0x01);
+                ret = regmap_write(priv->regmap, 0x29, 0x01);
                 if (ret < 0)
                         goto err;
 
-                ret = e4000_rd_regs(priv, 0x2a, buf, 3);
+                ret = regmap_bulk_read(priv->regmap, 0x2a, buf, 3);
                 if (ret < 0)
                         goto err;
 
@@ -328,16 +237,16 @@ static int e4000_set_params(struct dvb_frontend *fe)
         swap(q_data[2], q_data[3]);
         swap(i_data[2], i_data[3]);
 
-        ret = e4000_wr_regs(priv, 0x50, q_data, 4);
+        ret = regmap_bulk_write(priv->regmap, 0x50, q_data, 4);
         if (ret < 0)
                 goto err;
 
-        ret = e4000_wr_regs(priv, 0x60, i_data, 4);
+        ret = regmap_bulk_write(priv->regmap, 0x60, i_data, 4);
         if (ret < 0)
                 goto err;
 
         /* gain control auto */
-        ret = e4000_wr_reg(priv, 0x1a, 0x17);
+        ret = regmap_write(priv->regmap, 0x1a, 0x17);
         if (ret < 0)
                 goto err;
 err:
@@ -378,12 +287,12 @@ static int e4000_set_lna_gain(struct dvb_frontend *fe)
         else
                 u8tmp = 0x10;
 
-        ret = e4000_wr_reg(priv, 0x1a, u8tmp);
+        ret = regmap_write(priv->regmap, 0x1a, u8tmp);
         if (ret)
                 goto err;
 
         if (priv->lna_gain_auto->val == false) {
-                ret = e4000_wr_reg(priv, 0x14, priv->lna_gain->val);
+                ret = regmap_write(priv->regmap, 0x14, priv->lna_gain->val);
                 if (ret)
                         goto err;
         }
@@ -410,12 +319,12 @@ static int e4000_set_mixer_gain(struct dvb_frontend *fe)
         else
                 u8tmp = 0x14;
 
-        ret = e4000_wr_reg(priv, 0x20, u8tmp);
+        ret = regmap_write(priv->regmap, 0x20, u8tmp);
         if (ret)
                 goto err;
 
         if (priv->mixer_gain_auto->val == false) {
-                ret = e4000_wr_reg(priv, 0x15, priv->mixer_gain->val);
+                ret = regmap_write(priv->regmap, 0x15, priv->mixer_gain->val);
                 if (ret)
                         goto err;
         }
@@ -447,14 +356,14 @@ static int e4000_set_if_gain(struct dvb_frontend *fe)
         else
                 u8tmp = 0x10;
 
-        ret = e4000_wr_reg(priv, 0x1a, u8tmp);
+        ret = regmap_write(priv->regmap, 0x1a, u8tmp);
         if (ret)
                 goto err;
 
         if (priv->if_gain_auto->val == false) {
                 buf[0] = e4000_if_gain_lut[priv->if_gain->val].reg16_val;
                 buf[1] = e4000_if_gain_lut[priv->if_gain->val].reg17_val;
-                ret = e4000_wr_regs(priv, 0x16, buf, 2);
+                ret = regmap_bulk_write(priv->regmap, 0x16, buf, 2);
                 if (ret)
                         goto err;
         }
@@ -469,16 +378,13 @@ static int e4000_pll_lock(struct dvb_frontend *fe)
 {
         struct e4000_priv *priv = fe->tuner_priv;
         int ret;
-        u8 u8tmp;
+        unsigned int utmp;
 
-        if (priv->active == false)
-                return 0;
-
-        ret = e4000_rd_reg(priv, 0x07, &u8tmp);
-        if (ret)
+        ret = regmap_read(priv->regmap, 0x07, &utmp);
+        if (ret < 0)
                 goto err;
 
-        priv->pll_lock->val = (u8tmp & 0x01);
+        priv->pll_lock->val = (utmp & 0x01);
 err:
         if (ret)
                 dev_dbg(&priv->client->dev, "%s: failed=%d\n", __func__, ret);
@@ -488,15 +394,19 @@ err:
 
 static int e4000_g_volatile_ctrl(struct v4l2_ctrl *ctrl)
 {
-        struct e4000_priv *priv =
-                        container_of(ctrl->handler, struct e4000_priv, hdl);
+        struct e4000_priv *priv = container_of(ctrl->handler, struct e4000_priv, hdl);
         int ret;
 
+        if (priv->active == false)
+                return 0;
+
         switch (ctrl->id) {
         case  V4L2_CID_RF_TUNER_PLL_LOCK:
                 ret = e4000_pll_lock(priv->fe);
                 break;
         default:
+                dev_dbg(&priv->client->dev, "%s: unknown ctrl: id=%d name=%s\n",
+                                __func__, ctrl->id, ctrl->name);
                 ret = -EINVAL;
         }
 
@@ -505,16 +415,13 @@ static int e4000_g_volatile_ctrl(struct v4l2_ctrl *ctrl)
 
 static int e4000_s_ctrl(struct v4l2_ctrl *ctrl)
 {
-        struct e4000_priv *priv =
-                        container_of(ctrl->handler, struct e4000_priv, hdl);
+        struct e4000_priv *priv = container_of(ctrl->handler, struct e4000_priv, hdl);
         struct dvb_frontend *fe = priv->fe;
         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
         int ret;
 
-        dev_dbg(&priv->client->dev,
-                        "%s: id=%d name=%s val=%d min=%d max=%d step=%d\n",
-                        __func__, ctrl->id, ctrl->name, ctrl->val,
-                        ctrl->minimum, ctrl->maximum, ctrl->step);
+        if (priv->active == false)
+                return 0;
 
         switch (ctrl->id) {
         case V4L2_CID_RF_TUNER_BANDWIDTH_AUTO:
@@ -535,6 +442,8 @@ static int e4000_s_ctrl(struct v4l2_ctrl *ctrl)
                 ret = e4000_set_if_gain(priv->fe);
                 break;
         default:
+                dev_dbg(&priv->client->dev, "%s: unknown ctrl: id=%d name=%s\n",
+                                __func__, ctrl->id, ctrl->name);
                 ret = -EINVAL;
         }
 
@@ -571,7 +480,12 @@ static int e4000_probe(struct i2c_client *client,
         struct dvb_frontend *fe = cfg->fe;
         struct e4000_priv *priv;
         int ret;
-        u8 chip_id;
+        unsigned int utmp;
+        static const struct regmap_config regmap_config = {
+                .reg_bits = 8,
+                .val_bits = 8,
+                .max_register = 0xff,
+        };
 
         priv = kzalloc(sizeof(struct e4000_priv), GFP_KERNEL);
         if (!priv) {
@@ -583,22 +497,26 @@ static int e4000_probe(struct i2c_client *client,
         priv->clock = cfg->clock;
         priv->client = client;
         priv->fe = cfg->fe;
+        priv->regmap = devm_regmap_init_i2c(client, &regmap_config);
+        if (IS_ERR(priv->regmap)) {
+                ret = PTR_ERR(priv->regmap);
+                goto err;
+        }
 
         /* check if the tuner is there */
-        ret = e4000_rd_reg(priv, 0x02, &chip_id);
+        ret = regmap_read(priv->regmap, 0x02, &utmp);
         if (ret < 0)
                 goto err;
 
-        dev_dbg(&priv->client->dev,
-                        "%s: chip_id=%02x\n", __func__, chip_id);
+        dev_dbg(&priv->client->dev, "%s: chip id=%02x\n", __func__, utmp);
 
-        if (chip_id != 0x40) {
+        if (utmp != 0x40) {
                 ret = -ENODEV;
                 goto err;
         }
 
         /* put sleep as chip seems to be in normal mode by default */
-        ret = e4000_wr_reg(priv, 0x00, 0x00);
+        ret = regmap_write(priv->regmap, 0x00, 0x00);
         if (ret < 0)
                 goto err;