[PATCH 4/6] input: himax_hx83112b: implement MCU register reading
STALE881d
From: Felix Kaechele <hidden>
Date: 2024-05-04 02:15:22
Also in:
linux-devicetree, lkml
Subsystem:
himax hx83112b touchscreen support, input (keyboard, mouse, joystick, touchscreen) drivers, the rest · Maintainers:
Job Noorman, Dmitry Torokhov, Linus Torvalds
Revision v1 of 2 in this series.
Revisions (2)
- v1 current
- v2 [diff vs current]
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 <redacted> --- drivers/input/touchscreen/himax_hx83112b.c | 51 ++++++++++++++++++++-- 1 file changed, 48 insertions(+), 3 deletions(-)
diff --git a/drivers/input/touchscreen/himax_hx83112b.c b/drivers/input/touchscreen/himax_hx83112b.c
index ba5442cc0a24..0173ff394a99 100644
--- a/drivers/input/touchscreen/himax_hx83112b.c
+++ b/drivers/input/touchscreen/himax_hx83112b.c@@ -29,9 +29,13 @@ #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
@@ -73,10 +77,34 @@ static const char *const himax_supply_names[] = { "vdd", }; -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;
@@ -86,7 +114,24 @@ 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;
@@ -112,7 +157,7 @@ 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;
--
2.44.0