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authorNikolaus Voss <nikolaus.voss@loewensteinmedical.de>2019-02-20 16:11:38 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2019-02-21 10:54:23 +0100
commit8a863a608d47fa5d9dd15cf841817f73f804cf91 (patch)
treeea5f5dec26896623acd12eac41ebe9eb5be454d4 /drivers/usb
parent8fde481ef3674ae5ad0dbfef4df18ff507c5675a (diff)
downloadlinux-8a863a608d47fa5d9dd15cf841817f73f804cf91.tar.bz2
usb: typec: tps6598x: handle block writes separately with plain-I2C adapters
Commit 1a2f474d328f handles block _reads_ separately with plain-I2C adapters, but the problem described with regmap-i2c not handling SMBus block transfers (i.e. read and writes) correctly also exists with writes. As workaround, this patch adds a block write function the same way 1a2f474d328f adds a block read function. Fixes: 1a2f474d328f ("usb: typec: tps6598x: handle block reads separately with plain-I2C adapters") Fixes: 0a4c005bd171 ("usb: typec: driver for TI TPS6598x USB Power Delivery controllers") Signed-off-by: Nikolaus Voss <nikolaus.voss@loewensteinmedical.de> Cc: stable <stable@vger.kernel.org> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Acked-by: Heikki Krogerus <heikki.krogerus@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb')
-rw-r--r--drivers/usb/typec/tps6598x.c26
1 files changed, 20 insertions, 6 deletions
diff --git a/drivers/usb/typec/tps6598x.c b/drivers/usb/typec/tps6598x.c
index 9947c87d2a1e..c674abe3cf99 100644
--- a/drivers/usb/typec/tps6598x.c
+++ b/drivers/usb/typec/tps6598x.c
@@ -126,6 +126,20 @@ tps6598x_block_read(struct tps6598x *tps, u8 reg, void *val, size_t len)
return 0;
}
+static int tps6598x_block_write(struct tps6598x *tps, u8 reg,
+ void *val, size_t len)
+{
+ u8 data[TPS_MAX_LEN + 1];
+
+ if (!tps->i2c_protocol)
+ return regmap_raw_write(tps->regmap, reg, val, len);
+
+ data[0] = len;
+ memcpy(&data[1], val, len);
+
+ return regmap_raw_write(tps->regmap, reg, data, sizeof(data));
+}
+
static inline int tps6598x_read16(struct tps6598x *tps, u8 reg, u16 *val)
{
return tps6598x_block_read(tps, reg, val, sizeof(u16));
@@ -143,23 +157,23 @@ static inline int tps6598x_read64(struct tps6598x *tps, u8 reg, u64 *val)
static inline int tps6598x_write16(struct tps6598x *tps, u8 reg, u16 val)
{
- return regmap_raw_write(tps->regmap, reg, &val, sizeof(u16));
+ return tps6598x_block_write(tps, reg, &val, sizeof(u16));
}
static inline int tps6598x_write32(struct tps6598x *tps, u8 reg, u32 val)
{
- return regmap_raw_write(tps->regmap, reg, &val, sizeof(u32));
+ return tps6598x_block_write(tps, reg, &val, sizeof(u32));
}
static inline int tps6598x_write64(struct tps6598x *tps, u8 reg, u64 val)
{
- return regmap_raw_write(tps->regmap, reg, &val, sizeof(u64));
+ return tps6598x_block_write(tps, reg, &val, sizeof(u64));
}
static inline int
tps6598x_write_4cc(struct tps6598x *tps, u8 reg, const char *val)
{
- return regmap_raw_write(tps->regmap, reg, &val, sizeof(u32));
+ return tps6598x_block_write(tps, reg, &val, sizeof(u32));
}
static int tps6598x_read_partner_identity(struct tps6598x *tps)
@@ -245,8 +259,8 @@ static int tps6598x_exec_cmd(struct tps6598x *tps, const char *cmd,
return -EBUSY;
if (in_len) {
- ret = regmap_raw_write(tps->regmap, TPS_REG_DATA1,
- in_data, in_len);
+ ret = tps6598x_block_write(tps, TPS_REG_DATA1,
+ in_data, in_len);
if (ret)
return ret;
}