media: atomisp: use read/write routines from mainstream

There is an ov2680 driver mainstream. Use the read/write
routines from it, as the ones inside this driver are
generating some errors:

	ov2680 i2c-OVTI2680:00: ov2680_i2c_write: i2c write reg=0x3086, value 0x00, error -121

Maybe the code that changes from/to BE are not right.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

diff --git a/drivers/staging/media/atomisp/i2c/atomisp-ov2680.c b/drivers/staging/media/atomisp/i2c/atomisp-ov2680.c
index 6cf507e..b63574b 100644 (file)
--- a/drivers/staging/media/atomisp/i2c/atomisp-ov2680.c
+++ b/drivers/staging/media/atomisp/i2c/atomisp-ov2680.c
@@ -14,6 +14,8 @@
  *
  */
 
+#include <asm/unaligned.h>
+
 #include <linux/module.h>
 #include <linux/types.h>
 #include <linux/kernel.h>
@@ -45,59 +47,34 @@ static enum atomisp_bayer_order ov2680_bayer_order_mapping[] = {
 
 /* i2c read/write stuff */
 static int ov2680_read_reg(struct i2c_client *client,
-                          u16 data_length, u16 reg, u16 *val)
+                          int len, u16 reg, u16 *val)
 {
-       int err;
-       struct i2c_msg msg[2];
-       unsigned char data[6];
-
-       if (!client->adapter) {
-               dev_err(&client->dev, "%s error, no client->adapter\n",
-                       __func__);
-               return -ENODEV;
-       }
+       struct i2c_msg msgs[2];
+       u8 addr_buf[2] = { reg >> 8, reg & 0xff };
+       u8 data_buf[4] = { 0, };
+       int ret;
 
-       if (data_length != OV2680_8BIT && data_length != OV2680_16BIT
-           && data_length != OV2680_32BIT) {
-               dev_err(&client->dev, "%s error, invalid data length\n",
-                       __func__);
+       if (len > 4)
                return -EINVAL;
-       }
-
-       memset(msg, 0, sizeof(msg));
-
-       msg[0].addr = client->addr;
-       msg[0].flags = 0;
-       msg[0].len = I2C_MSG_LENGTH;
-       msg[0].buf = data;
 
-       /* high byte goes out first */
-       data[0] = (u8)(reg >> 8);
-       data[1] = (u8)(reg & 0xff);
+       msgs[0].addr = client->addr;
+       msgs[0].flags = 0;
+       msgs[0].len = ARRAY_SIZE(addr_buf);
+       msgs[0].buf = addr_buf;
 
-       msg[1].addr = client->addr;
-       msg[1].len = data_length;
-       msg[1].flags = I2C_M_RD;
-       msg[1].buf = data;
+       msgs[1].addr = client->addr;
+       msgs[1].flags = I2C_M_RD;
+       msgs[1].len = len;
+       msgs[1].buf = &data_buf[4 - len];
 
-       err = i2c_transfer(client->adapter, msg, 2);
-       if (err != 2) {
-               if (err >= 0)
-                       err = -EIO;
-               dev_err(&client->dev,
-                       "read from offset 0x%x error %d", reg, err);
-               return err;
+       ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
+       if (ret != ARRAY_SIZE(msgs)) {
+               dev_err(&client->dev, "read error: reg=0x%4x: %d\n", reg, ret);
+               return -EIO;
        }
 
-       *val = 0;
-       /* high byte comes first */
-       if (data_length == OV2680_8BIT)
-               *val = (u8)data[0];
-       else if (data_length == OV2680_16BIT)
-               *val = be16_to_cpu(*(__be16 *)&data[0]);
-       else
-               *val = be32_to_cpu(*(__be32 *)&data[0]);
-       //dev_dbg(&client->dev,  "++++i2c read adr%x = %x\n", reg,*val);
+       *val = get_unaligned_be32(data_buf);
+
        return 0;
 }
 
@@ -120,39 +97,24 @@ static int ov2680_i2c_write(struct i2c_client *client, u16 len, u8 *data)
        return ret == num_msg ? 0 : ret;
 }
 
-static int ov2680_write_reg(struct i2c_client *client, u16 data_length,
+static int ov2680_write_reg(struct i2c_client *client, unsigned int len,
                            u16 reg, u16 val)
 {
+       u8 buf[6];
        int ret;
-       unsigned char data[4] = {0};
-       __be16 *wreg = (void *)data;
-       const u16 len = data_length + sizeof(u16); /* 16-bit address + data */
 
-       if (data_length != OV2680_8BIT && data_length != OV2680_16BIT) {
-               dev_err(&client->dev,
-                       "%s error, invalid data_length\n", __func__);
+       if (len > 4)
                return -EINVAL;
-       }
-
-       /* high byte goes out first */
-       *wreg = cpu_to_be16(reg);
-
-       if (data_length == OV2680_8BIT) {
-               data[2] = (u8)(val);
-       } else {
-               /* OV2680_16BIT */
-               __be16 *wdata = (void *)&data[2];
 
-               *wdata = cpu_to_be16(val);
+       put_unaligned_be16(reg, buf);
+       put_unaligned_be32(val << (8 * (4 - len)), buf + 2);
+       ret = i2c_master_send(client, buf, len + 2);
+       if (ret != len + 2) {
+               dev_err(&client->dev, "write error: reg=0x%4x: %d\n", reg, ret);
+               return -EIO;
        }
 
-       ret = ov2680_i2c_write(client, len, data);
-       if (ret)
-               dev_err(&client->dev,
-                       "write error: wrote 0x%x to offset 0x%02x error %d",
-                       val, reg, ret);
-
-       return ret;
+       return 0;
 }
 
 /*
@@ -359,37 +321,37 @@ static int ov2680_get_intg_factor(struct i2c_client *client,
        buf->read_mode = res->bin_mode;
 
        /* get the cropping and output resolution to ISP for this mode. */
-       ret =  ov2680_read_reg(client, OV2680_16BIT,
+       ret =  ov2680_read_reg(client, 2,
                               OV2680_HORIZONTAL_START_H, &reg_val);
        if (ret)
                return ret;
        buf->crop_horizontal_start = reg_val;
 
-       ret =  ov2680_read_reg(client, OV2680_16BIT,
+       ret =  ov2680_read_reg(client, 2,
                               OV2680_VERTICAL_START_H, &reg_val);
        if (ret)
                return ret;
        buf->crop_vertical_start = reg_val;
 
-       ret = ov2680_read_reg(client, OV2680_16BIT,
+       ret = ov2680_read_reg(client, 2,
                              OV2680_HORIZONTAL_END_H, &reg_val);
        if (ret)
                return ret;
        buf->crop_horizontal_end = reg_val;
 
-       ret = ov2680_read_reg(client, OV2680_16BIT,
+       ret = ov2680_read_reg(client, 2,
                              OV2680_VERTICAL_END_H, &reg_val);
        if (ret)
                return ret;
        buf->crop_vertical_end = reg_val;
 
-       ret = ov2680_read_reg(client, OV2680_16BIT,
+       ret = ov2680_read_reg(client, 2,
                              OV2680_HORIZONTAL_OUTPUT_SIZE_H, &reg_val);
        if (ret)
                return ret;
        buf->output_width = reg_val;
 
-       ret = ov2680_read_reg(client, OV2680_16BIT,
+       ret = ov2680_read_reg(client, 2,
                              OV2680_VERTICAL_OUTPUT_SIZE_H, &reg_val);
        if (ret)
                return ret;
@@ -418,7 +380,7 @@ static long __ov2680_set_exposure(struct v4l2_subdev *sd, int coarse_itg,
        vts = ov2680_res[dev->fmt_idx].lines_per_frame;
 
        /* group hold */
-       ret = ov2680_write_reg(client, OV2680_8BIT,
+       ret = ov2680_write_reg(client, 1,
                               OV2680_GROUP_ACCESS, 0x00);
        if (ret) {
                dev_err(&client->dev, "%s: write 0x%02x: error, aborted\n",
@@ -430,7 +392,7 @@ static long __ov2680_set_exposure(struct v4l2_subdev *sd, int coarse_itg,
        if (coarse_itg > vts - OV2680_INTEGRATION_TIME_MARGIN)
                vts = (u16)coarse_itg + OV2680_INTEGRATION_TIME_MARGIN;
 
-       ret = ov2680_write_reg(client, OV2680_16BIT, OV2680_TIMING_VTS_H, vts);
+       ret = ov2680_write_reg(client, 2, OV2680_TIMING_VTS_H, vts);
        if (ret) {
                dev_err(&client->dev, "%s: write 0x%02x: error, aborted\n",
                        __func__, OV2680_TIMING_VTS_H);
@@ -441,7 +403,7 @@ static long __ov2680_set_exposure(struct v4l2_subdev *sd, int coarse_itg,
 
        /* Lower four bit should be 0*/
        exp_val = coarse_itg << 4;
-       ret = ov2680_write_reg(client, OV2680_8BIT,
+       ret = ov2680_write_reg(client, 1,
                               OV2680_EXPOSURE_L, exp_val & 0xFF);
        if (ret) {
                dev_err(&client->dev, "%s: write 0x%02x: error, aborted\n",
@@ -449,7 +411,7 @@ static long __ov2680_set_exposure(struct v4l2_subdev *sd, int coarse_itg,
                return ret;
        }
 
-       ret = ov2680_write_reg(client, OV2680_8BIT,
+       ret = ov2680_write_reg(client, 1,
                               OV2680_EXPOSURE_M, (exp_val >> 8) & 0xFF);
        if (ret) {
                dev_err(&client->dev, "%s: write 0x%02x: error, aborted\n",
@@ -457,7 +419,7 @@ static long __ov2680_set_exposure(struct v4l2_subdev *sd, int coarse_itg,
                return ret;
        }
 
-       ret = ov2680_write_reg(client, OV2680_8BIT,
+       ret = ov2680_write_reg(client, 1,
                               OV2680_EXPOSURE_H, (exp_val >> 16) & 0x0F);
        if (ret) {
                dev_err(&client->dev, "%s: write 0x%02x: error, aborted\n",
@@ -466,7 +428,7 @@ static long __ov2680_set_exposure(struct v4l2_subdev *sd, int coarse_itg,
        }
 
        /* Analog gain */
-       ret = ov2680_write_reg(client, OV2680_16BIT, OV2680_AGC_H, gain);
+       ret = ov2680_write_reg(client, 2, OV2680_AGC_H, gain);
        if (ret) {
                dev_err(&client->dev, "%s: write 0x%02x: error, aborted\n",
                        __func__, OV2680_AGC_H);
@@ -474,7 +436,7 @@ static long __ov2680_set_exposure(struct v4l2_subdev *sd, int coarse_itg,
        }
        /* Digital gain */
        if (digitgain) {
-               ret = ov2680_write_reg(client, OV2680_16BIT,
+               ret = ov2680_write_reg(client, 2,
                                       OV2680_MWB_RED_GAIN_H, digitgain);
                if (ret) {
                        dev_err(&client->dev,
@@ -483,7 +445,7 @@ static long __ov2680_set_exposure(struct v4l2_subdev *sd, int coarse_itg,
                        return ret;
                }
 
-               ret = ov2680_write_reg(client, OV2680_16BIT,
+               ret = ov2680_write_reg(client, 2,
                                       OV2680_MWB_GREEN_GAIN_H, digitgain);
                if (ret) {
                        dev_err(&client->dev,
@@ -492,7 +454,7 @@ static long __ov2680_set_exposure(struct v4l2_subdev *sd, int coarse_itg,
                        return ret;
                }
 
-               ret = ov2680_write_reg(client, OV2680_16BIT,
+               ret = ov2680_write_reg(client, 2,
                                       OV2680_MWB_BLUE_GAIN_H, digitgain);
                if (ret) {
                        dev_err(&client->dev,
@@ -503,13 +465,13 @@ static long __ov2680_set_exposure(struct v4l2_subdev *sd, int coarse_itg,
        }
 
        /* End group */
-       ret = ov2680_write_reg(client, OV2680_8BIT,
+       ret = ov2680_write_reg(client, 1,
                               OV2680_GROUP_ACCESS, 0x10);
        if (ret)
                return ret;
 
        /* Delay launch group */
-       ret = ov2680_write_reg(client, OV2680_8BIT,
+       ret = ov2680_write_reg(client, 1,
                               OV2680_GROUP_ACCESS, 0xa0);
        if (ret)
                return ret;
@@ -570,20 +532,20 @@ static int ov2680_q_exposure(struct v4l2_subdev *sd, s32 *value)
        int ret;
 
        /* get exposure */
-       ret = ov2680_read_reg(client, OV2680_8BIT,
+       ret = ov2680_read_reg(client, 1,
                              OV2680_EXPOSURE_L,
                              &reg_v);
        if (ret)
                goto err;
 
-       ret = ov2680_read_reg(client, OV2680_8BIT,
+       ret = ov2680_read_reg(client, 1,
                              OV2680_EXPOSURE_M,
                              &reg_v2);
        if (ret)
                goto err;
 
        reg_v += reg_v2 << 8;
-       ret = ov2680_read_reg(client, OV2680_8BIT,
+       ret = ov2680_read_reg(client, 1,
                              OV2680_EXPOSURE_H,
                              &reg_v2);
        if (ret)
@@ -619,7 +581,7 @@ static int ov2680_v_flip(struct v4l2_subdev *sd, s32 value)
        u8 index;
 
        dev_dbg(&client->dev, "@%s: value:%d\n", __func__, value);
-       ret = ov2680_read_reg(client, OV2680_8BIT, OV2680_FLIP_REG, &val);
+       ret = ov2680_read_reg(client, 1, OV2680_FLIP_REG, &val);
        if (ret)
                return ret;
        if (value) {
@@ -627,7 +589,7 @@ static int ov2680_v_flip(struct v4l2_subdev *sd, s32 value)
        } else {
                val &= ~OV2680_FLIP_MIRROR_BIT_ENABLE;
        }
-       ret = ov2680_write_reg(client, OV2680_8BIT,
+       ret = ov2680_write_reg(client, 1,
                               OV2680_FLIP_REG, val);
        if (ret)
                return ret;
@@ -653,7 +615,7 @@ static int ov2680_h_flip(struct v4l2_subdev *sd, s32 value)
 
        dev_dbg(&client->dev, "@%s: value:%d\n", __func__, value);
 
-       ret = ov2680_read_reg(client, OV2680_8BIT, OV2680_MIRROR_REG, &val);
+       ret = ov2680_read_reg(client, 1, OV2680_MIRROR_REG, &val);
        if (ret)
                return ret;
        if (value) {
@@ -661,7 +623,7 @@ static int ov2680_h_flip(struct v4l2_subdev *sd, s32 value)
        } else {
                val &= ~OV2680_FLIP_MIRROR_BIT_ENABLE;
        }
-       ret = ov2680_write_reg(client, OV2680_8BIT,
+       ret = ov2680_write_reg(client, 1,
                               OV2680_MIRROR_REG, val);
        if (ret)
                return ret;
@@ -831,7 +793,7 @@ static int ov2680_init_registers(struct v4l2_subdev *sd)
        struct i2c_client *client = v4l2_get_subdevdata(sd);
        int ret;
 
-       ret = ov2680_write_reg(client, OV2680_8BIT, OV2680_SW_RESET, 0x01);
+       ret = ov2680_write_reg(client, 1, OV2680_SW_RESET, 0x01);
        ret |= ov2680_write_reg_array(client, ov2680_global_setting);
 
        return ret;
@@ -1183,13 +1145,13 @@ static int ov2680_detect(struct i2c_client *client)
        if (!i2c_check_functionality(adapter, I2C_FUNC_I2C))
                return -ENODEV;
 
-       ret = ov2680_read_reg(client, OV2680_8BIT,
+       ret = ov2680_read_reg(client, 1,
                              OV2680_SC_CMMN_CHIP_ID_H, &high);
        if (ret) {
                dev_err(&client->dev, "sensor_id_high = 0x%x\n", high);
                return -ENODEV;
        }
-       ret = ov2680_read_reg(client, OV2680_8BIT,
+       ret = ov2680_read_reg(client, 1,
                              OV2680_SC_CMMN_CHIP_ID_L, &low);
        id = ((((u16)high) << 8) | (u16)low);
 
@@ -1198,7 +1160,7 @@ static int ov2680_detect(struct i2c_client *client)
                return -ENODEV;
        }
 
-       ret = ov2680_read_reg(client, OV2680_8BIT,
+       ret = ov2680_read_reg(client, 1,
                              OV2680_SC_CMMN_SUB_ID, &high);
        revision = (u8)high & 0x0f;
 
@@ -1220,7 +1182,7 @@ static int ov2680_s_stream(struct v4l2_subdev *sd, int enable)
        else
                dev_dbg(&client->dev, "ov2680_s_stream off\n");
 
-       ret = ov2680_write_reg(client, OV2680_8BIT, OV2680_SW_STREAM,
+       ret = ov2680_write_reg(client, 1, OV2680_SW_STREAM,
                               enable ? OV2680_START_STREAMING :
                               OV2680_STOP_STREAMING);
 #if 0