Function that splits and sends most typical I2C register write.
Signed-off-by: Antti Palosaari <cr...@iki.fi>
---
drivers/media/dvb/dvb-core/Makefile | 2 +-
drivers/media/dvb/dvb-core/dvb_generic.c | 48
++++++++++++++++++++++++++++++
drivers/media/dvb/dvb-core/dvb_generic.h | 21 +++++++++++++
3 files changed, 70 insertions(+), 1 deletions(-)
create mode 100644 drivers/media/dvb/dvb-core/dvb_generic.c
create mode 100644 drivers/media/dvb/dvb-core/dvb_generic.h
diff --git a/drivers/media/dvb/dvb-core/Makefile
b/drivers/media/dvb/dvb-core/Makefile
index 8f22bcd..230584a 100644
--- a/drivers/media/dvb/dvb-core/Makefile
+++ b/drivers/media/dvb/dvb-core/Makefile
@@ -6,6 +6,6 @@ dvb-net-$(CONFIG_DVB_NET) := dvb_net.o
dvb-core-objs := dvbdev.o dmxdev.o dvb_demux.o dvb_filter.o \
dvb_ca_en50221.o dvb_frontend.o \
- $(dvb-net-y) dvb_ringbuffer.o dvb_math.o
+ $(dvb-net-y) dvb_ringbuffer.o dvb_math.o dvb_generic.o
obj-$(CONFIG_DVB_CORE) += dvb-core.o
diff --git a/drivers/media/dvb/dvb-core/dvb_generic.c
b/drivers/media/dvb/dvb-core/dvb_generic.c
new file mode 100644
index 0000000..002bd24
--- /dev/null
+++ b/drivers/media/dvb/dvb-core/dvb_generic.c
@@ -0,0 +1,48 @@
+#include <linux/i2c.h>
+#include "dvb_generic.h"
+
+/* write multiple registers */
+int dvb_wr_regs(struct dvb_i2c_cfg *i2c_cfg, u8 reg, u8 *val, int len_tot)
+{
+#define REG_ADDR_LEN 1
+#define REG_VAL_LEN 1
+ int ret, len_cur, len_rem, len_max;
+ u8 buf[i2c_cfg->max_wr];
+ struct i2c_msg msg[1] = {
+ {
+ .addr = i2c_cfg->addr,
+ .flags = 0,
+ .buf = buf,
+ }
+ };
+
+ len_max = i2c_cfg->max_wr - REG_ADDR_LEN;
+ for (len_rem = len_tot; len_rem > 0; len_rem -= len_max) {
+ len_cur = len_rem;
+ if (len_cur > len_max)
+ len_cur = len_max;
+
+ msg[0].len = len_cur + REG_ADDR_LEN;
+ buf[0] = reg;
+ memcpy(&buf[REG_ADDR_LEN], &val[len_tot - len_rem], len_cur);
+
+ ret = i2c_transfer(i2c_cfg->adapter, msg, 1);
+ if (ret != 1) {
+ warn("i2c wr failed=%d reg=%02x len=%d",
+ ret, reg, len_cur);
+ return -EREMOTEIO;
+ }
+ reg += len_cur;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL(dvb_wr_regs);
+
+/* write single register */
+int dvb_wr_reg(struct dvb_i2c_cfg *i2c_cfg, u8 reg, u8 val)
+{
+ return dvb_wr_regs(i2c_cfg, reg, &val, 1);
+}
+EXPORT_SYMBOL(dvb_wr_reg);
+
diff --git a/drivers/media/dvb/dvb-core/dvb_generic.h
b/drivers/media/dvb/dvb-core/dvb_generic.h
new file mode 100644
index 0000000..7a140ab
--- /dev/null
+++ b/drivers/media/dvb/dvb-core/dvb_generic.h
@@ -0,0 +1,21 @@
+#ifndef DVB_GENERIC_H
+#define DVB_GENERIC_H
+
+#define DVB_GENERIC_LOG_PREFIX "dvb_generic"
+#define warn(f, arg...) \
+ printk(KERN_WARNING DVB_GENERIC_LOG_PREFIX": " f "\n", ## arg)
+
+struct dvb_i2c_cfg {
+ struct i2c_adapter *adapter;
+ u8 addr;
+ /* TODO: reg_addr_len; as now use one byte */
+ /* TODO: reg_val_len; as now use one byte */
+ u8 max_wr;
+ u8 max_rd;
+};
+
+extern int dvb_wr_regs(struct dvb_i2c_cfg *, u8, u8 *, int);
+extern int dvb_wr_reg(struct dvb_i2c_cfg *, u8, u8);
+
+#endif
+
--
1.7.4.4
--
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