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Input: himax_hx83112b - implement MCU register reading

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Implement reading from the MCU in a more universal fashion. This allows
properly handling reads of more than 4 bytes using the AHB FIFO
implemented in the chip.

Signed-off-by: Felix Kaechele <felix@kaechele.ca>
Link: https://lore.kernel.org/r/20240620145019.156187-4-felix@kaechele.ca
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Felix Kaechele 2024-06-20 10:50:04 -04:00 • committed by Dmitry Torokhov
parent 05eab5456b
commit 0944829d49
1 changed files with 47 additions and 3 deletions
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50
drivers/input/touchscreen/himax_hx83112b.c
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@ -27,9 +27,13 @@
#define HIMAX_AHB_ADDR_BYTE_0 0x00
#define HIMAX_AHB_ADDR_RDATA_BYTE_0 0x08
#define HIMAX_AHB_ADDR_ACCESS_DIRECTION 0x0c
#define HIMAX_AHB_ADDR_INCR4 0x0d
#define HIMAX_AHB_ADDR_CONTI 0x13
#define HIMAX_AHB_ADDR_EVENT_STACK 0x30
#define HIMAX_AHB_CMD_ACCESS_DIRECTION_READ 0x00
#define HIMAX_AHB_CMD_INCR4 0x10
#define HIMAX_AHB_CMD_CONTI 0x31
#define HIMAX_REG_ADDR_ICID 0x900000d0
@ -65,10 +69,34 @@ static const struct regmap_config himax_regmap_config = {
.val_format_endian = REGMAP_ENDIAN_LITTLE,
};
static int himax_read_config(struct himax_ts_data *ts, u32 address, u32 *dst)
static int himax_bus_enable_burst(struct himax_ts_data *ts)
{
int error;
error = regmap_write(ts->regmap, HIMAX_AHB_ADDR_CONTI,
HIMAX_AHB_CMD_CONTI);
if (error)
return error;
error = regmap_write(ts->regmap, HIMAX_AHB_ADDR_INCR4,
HIMAX_AHB_CMD_INCR4);
if (error)
return error;
return 0;
}
static int himax_bus_read(struct himax_ts_data *ts, u32 address, void *dst,
size_t length)
{
int error;
if (length > 4) {
error = himax_bus_enable_burst(ts);
if (error)
return error;
}
error = regmap_write(ts->regmap, HIMAX_AHB_ADDR_BYTE_0, address);
if (error)
return error;
@ -78,7 +106,23 @@ static int himax_read_config(struct himax_ts_data *ts, u32 address, u32 *dst)
if (error)
return error;
error = regmap_read(ts->regmap, HIMAX_AHB_ADDR_RDATA_BYTE_0, dst);
if (length > 4)
error = regmap_noinc_read(ts->regmap, HIMAX_AHB_ADDR_RDATA_BYTE_0,
dst, length);
else
error = regmap_read(ts->regmap, HIMAX_AHB_ADDR_RDATA_BYTE_0,
dst);
if (error)
return error;
return 0;
}
static int himax_read_mcu(struct himax_ts_data *ts, u32 address, u32 *dst)
{
int error;
error = himax_bus_read(ts, address, dst, sizeof(dst));
if (error)
return error;
@ -104,7 +148,7 @@ static int himax_read_product_id(struct himax_ts_data *ts, u32 *product_id)
{
int error;
error = himax_read_config(ts, HIMAX_REG_ADDR_ICID, product_id);
error = himax_read_mcu(ts, HIMAX_REG_ADDR_ICID, product_id);
if (error)
return error;