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[v3,04/13] hw/display/sm501: Replace i2c_send_recv() by i2c_recv() & i2c_send()

Message ID 20210616161418.2514095-5-f4bug@amsat.org (mailing list archive)
State New, archived
Headers show
Series hw/i2c: Remove confusing i2c_send_recv() API | expand

Commit Message

Philippe Mathieu-Daudé June 16, 2021, 4:14 p.m. UTC
Instead of using the confuse i2c_send_recv(), rewrite to directly
call i2c_recv() & i2c_send(), resulting in code easire to review.

Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
---
 hw/display/sm501.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

Comments

Richard Henderson June 16, 2021, 6:40 p.m. UTC | #1
On 6/16/21 9:14 AM, Philippe Mathieu-Daudé wrote:
> Instead of using the confuse i2c_send_recv(), rewrite to directly
> call i2c_recv() & i2c_send(), resulting in code easire to review.
> 
> Signed-off-by: Philippe Mathieu-Daudé<f4bug@amsat.org>
> ---
>   hw/display/sm501.c | 9 +++++----
>   1 file changed, 5 insertions(+), 4 deletions(-)

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>

r~
Corey Minyard June 16, 2021, 7:14 p.m. UTC | #2
On Wed, Jun 16, 2021 at 06:14:09PM +0200, Philippe Mathieu-Daudé wrote:
> Instead of using the confuse i2c_send_recv(), rewrite to directly
> call i2c_recv() & i2c_send(), resulting in code easire to review.
                                                  ^easier



> 
> Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
> ---
>  hw/display/sm501.c | 9 +++++----
>  1 file changed, 5 insertions(+), 4 deletions(-)
> 
> diff --git a/hw/display/sm501.c b/hw/display/sm501.c
> index f276276f7f1..569661a0746 100644
> --- a/hw/display/sm501.c
> +++ b/hw/display/sm501.c
> @@ -1033,17 +1033,18 @@ static void sm501_i2c_write(void *opaque, hwaddr addr, uint64_t value,
>      case SM501_I2C_CONTROL:
>          if (value & SM501_I2C_CONTROL_ENABLE) {
>              if (value & SM501_I2C_CONTROL_START) {
> +                bool is_recv = s->i2c_addr & 1;
>                  int res = i2c_start_transfer(s->i2c_bus,
>                                               s->i2c_addr >> 1,
> -                                             s->i2c_addr & 1);
> +                                             is_recv);
>                  if (res) {
>                      s->i2c_status |= SM501_I2C_STATUS_ERROR;
>                  } else {
>                      int i;
>                      for (i = 0; i <= s->i2c_byte_count; i++) {
> -                        res = i2c_send_recv(s->i2c_bus, &s->i2c_data[i],
> -                                            !(s->i2c_addr & 1));
> -                        if (res) {
> +                        if (is_recv) {
> +                            s->i2c_data[i] = i2c_recv(s->i2c_bus);
> +                        } else if (i2c_send(s->i2c_bus, s->i2c_data[i]) < 0) {
>                              s->i2c_status |= SM501_I2C_STATUS_ERROR;
>                              return;
>                          }
> -- 
> 2.31.1
>
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Patch

diff --git a/hw/display/sm501.c b/hw/display/sm501.c
index f276276f7f1..569661a0746 100644
--- a/hw/display/sm501.c
+++ b/hw/display/sm501.c
@@ -1033,17 +1033,18 @@  static void sm501_i2c_write(void *opaque, hwaddr addr, uint64_t value,
     case SM501_I2C_CONTROL:
         if (value & SM501_I2C_CONTROL_ENABLE) {
             if (value & SM501_I2C_CONTROL_START) {
+                bool is_recv = s->i2c_addr & 1;
                 int res = i2c_start_transfer(s->i2c_bus,
                                              s->i2c_addr >> 1,
-                                             s->i2c_addr & 1);
+                                             is_recv);
                 if (res) {
                     s->i2c_status |= SM501_I2C_STATUS_ERROR;
                 } else {
                     int i;
                     for (i = 0; i <= s->i2c_byte_count; i++) {
-                        res = i2c_send_recv(s->i2c_bus, &s->i2c_data[i],
-                                            !(s->i2c_addr & 1));
-                        if (res) {
+                        if (is_recv) {
+                            s->i2c_data[i] = i2c_recv(s->i2c_bus);
+                        } else if (i2c_send(s->i2c_bus, s->i2c_data[i]) < 0) {
                             s->i2c_status |= SM501_I2C_STATUS_ERROR;
                             return;
                         }