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Subject: [media] si2165: switch to regmap
Author:  Matthias Schwarzott <z...@gentoo.org>
Date:    Tue Jul 26 04:09:08 2016 -0300

This avoids some low-level operations.
It has the benefit that now register values van be read from 
/sys/kernel/debug/regmap
The maximum register value is just a guess - all higher addresses read as zero.

Signed-off-by: Matthias Schwarzott <z...@gentoo.org>
Signed-off-by: Mauro Carvalho Chehab <mche...@s-opensource.com>

 drivers/media/dvb-frontends/Kconfig  |  1 +
 drivers/media/dvb-frontends/si2165.c | 70 +++++++++++++-----------------------
 2 files changed, 25 insertions(+), 46 deletions(-)

---

diff --git a/drivers/media/dvb-frontends/Kconfig 
b/drivers/media/dvb-frontends/Kconfig
index c4b67f71d979..012225587c25 100644
--- a/drivers/media/dvb-frontends/Kconfig
+++ b/drivers/media/dvb-frontends/Kconfig
@@ -67,6 +67,7 @@ config DVB_TDA18271C2DD
 config DVB_SI2165
        tristate "Silicon Labs si2165 based"
        depends on DVB_CORE && I2C
+       select REGMAP_I2C
        default m if !MEDIA_SUBDRV_AUTOSELECT
        help
          A DVB-C/T demodulator.
diff --git a/drivers/media/dvb-frontends/si2165.c 
b/drivers/media/dvb-frontends/si2165.c
index 78543872d89d..78669ea68c61 100644
--- a/drivers/media/dvb-frontends/si2165.c
+++ b/drivers/media/dvb-frontends/si2165.c
@@ -25,6 +25,7 @@
 #include <linux/string.h>
 #include <linux/slab.h>
 #include <linux/firmware.h>
+#include <linux/regmap.h>
 
 #include "dvb_frontend.h"
 #include "dvb_math.h"
@@ -42,7 +43,7 @@
 struct si2165_state {
        struct i2c_client *client;
 
-       struct i2c_adapter *i2c;
+       struct regmap *regmap;
 
        struct dvb_frontend fe;
 
@@ -110,61 +111,27 @@ static int si2165_write(struct si2165_state *state, const 
u16 reg,
                       const u8 *src, const int count)
 {
        int ret;
-       struct i2c_msg msg;
-       u8 buf[2 + 4]; /* write a maximum of 4 bytes of data */
-
-       if (count + 2 > sizeof(buf)) {
-               dev_warn(&state->client->dev,
-                         "%s: i2c wr reg=%04x: count=%d is too big!\n",
-                         KBUILD_MODNAME, reg, count);
-               return -EINVAL;
-       }
-       buf[0] = reg >> 8;
-       buf[1] = reg & 0xff;
-       memcpy(buf + 2, src, count);
-
-       msg.addr = state->config.i2c_addr;
-       msg.flags = 0;
-       msg.buf = buf;
-       msg.len = count + 2;
 
        if (debug & DEBUG_I2C_WRITE)
                deb_i2c_write("reg: 0x%04x, data: %*ph\n", reg, count, src);
 
-       ret = i2c_transfer(state->i2c, &msg, 1);
+       ret = regmap_bulk_write(state->regmap, reg, src, count);
 
-       if (ret != 1) {
+       if (ret)
                dev_err(&state->client->dev, "%s: ret == %d\n", __func__, ret);
-               if (ret < 0)
-                       return ret;
-               else
-                       return -EREMOTEIO;
-       }
 
-       return 0;
+       return ret;
 }
 
 static int si2165_read(struct si2165_state *state,
                       const u16 reg, u8 *val, const int count)
 {
-       int ret;
-       u8 reg_buf[] = { reg >> 8, reg & 0xff };
-       struct i2c_msg msg[] = {
-               { .addr = state->config.i2c_addr,
-                 .flags = 0, .buf = reg_buf, .len = 2 },
-               { .addr = state->config.i2c_addr,
-                 .flags = I2C_M_RD, .buf = val, .len = count },
-       };
+       int ret = regmap_bulk_read(state->regmap, reg, val, count);
 
-       ret = i2c_transfer(state->i2c, msg, 2);
-
-       if (ret != 2) {
+       if (ret) {
                dev_err(&state->client->dev, "%s: error (addr %02x reg %04x 
error (ret == %i)\n",
                        __func__, state->config.i2c_addr, reg, ret);
-               if (ret < 0)
-                       return ret;
-               else
-                       return -EREMOTEIO;
+               return ret;
        }
 
        if (debug & DEBUG_I2C_READ)
@@ -176,9 +143,9 @@ static int si2165_read(struct si2165_state *state,
 static int si2165_readreg8(struct si2165_state *state,
                       const u16 reg, u8 *val)
 {
-       int ret;
-
-       ret = si2165_read(state, reg, val, 1);
+       unsigned int val_tmp;
+       int ret = regmap_read(state->regmap, reg, &val_tmp);
+       *val = (u8)val_tmp;
        deb_readreg("R(0x%04x)=0x%02x\n", reg, *val);
        return ret;
 }
@@ -196,7 +163,7 @@ static int si2165_readreg16(struct si2165_state *state,
 
 static int si2165_writereg8(struct si2165_state *state, const u16 reg, u8 val)
 {
-       return si2165_write(state, reg, &val, 1);
+       return regmap_write(state->regmap, reg, val);
 }
 
 static int si2165_writereg16(struct si2165_state *state, const u16 reg, u16 
val)
@@ -1058,6 +1025,11 @@ static int si2165_probe(struct i2c_client *client,
        u8 val;
        char rev_char;
        const char *chip_name;
+       static const struct regmap_config regmap_config = {
+               .reg_bits = 16,
+               .val_bits = 8,
+               .max_register = 0x08ff,
+       };
 
        /* allocate memory for the internal state */
        state = kzalloc(sizeof(struct si2165_state), GFP_KERNEL);
@@ -1066,9 +1038,15 @@ static int si2165_probe(struct i2c_client *client,
                goto error;
        }
 
+       /* create regmap */
+       state->regmap = devm_regmap_init_i2c(client, &regmap_config);
+       if (IS_ERR(state->regmap)) {
+               ret = PTR_ERR(state->regmap);
+               goto error;
+       }
+
        /* setup the state */
        state->client = client;
-       state->i2c = client->adapter;
        state->config.i2c_addr = client->addr;
        state->config.chip_mode = pdata->chip_mode;
        state->config.ref_freq_Hz = pdata->ref_freq_Hz;

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