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Date: Tue, 25 Oct 2011 21:30:28 -0500
From: Ben Gardner <gardner.ben@...il.com>
To: linux-i2c@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, Ben Gardner <gardner.ben@...il.com>
Subject: [PATCH] rtc-isl1208: Use SMBus functions if I2C isn't available
The rtc-isl1208 driver currently depends on raw I2C functionality.
This patch adds a fall-back to SMBus functions so that the driver can be
used on a SMBus-only platforms, such as i2c-isch.
Signed-off-by: Ben Gardner <gardner.ben@...il.com>
---
drivers/rtc/rtc-isl1208.c | 68 +++++++++++++++++++++++++++++++-------------
1 files changed, 48 insertions(+), 20 deletions(-)
diff --git a/drivers/rtc/rtc-isl1208.c b/drivers/rtc/rtc-isl1208.c
index ea10736..c553c7b 100644
--- a/drivers/rtc/rtc-isl1208.c
+++ b/drivers/rtc/rtc-isl1208.c
@@ -66,20 +66,35 @@ static int
isl1208_i2c_read_regs(struct i2c_client *client, u8 reg, u8 buf[],
unsigned len)
{
- u8 reg_addr[1] = { reg };
- struct i2c_msg msgs[2] = {
- {client->addr, 0, sizeof(reg_addr), reg_addr}
- ,
- {client->addr, I2C_M_RD, len, buf}
- };
int ret;
BUG_ON(reg > ISL1208_REG_USR2);
BUG_ON(reg + len > ISL1208_REG_USR2 + 1);
- ret = i2c_transfer(client->adapter, msgs, 2);
- if (ret > 0)
- ret = 0;
+ if (i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
+ u8 reg_addr[1] = { reg };
+ struct i2c_msg msgs[2] = {
+ {client->addr, 0, sizeof(reg_addr), reg_addr}
+ ,
+ {client->addr, I2C_M_RD, len, buf}
+ };
+
+ ret = i2c_transfer(client->adapter, msgs, 2);
+ if (ret > 0)
+ ret = 0;
+ } else {
+ int idx;
+ ret = i2c_smbus_read_byte_data(client, reg);
+ if (ret < 0)
+ return ret;
+ buf[0] = ret;
+ for (idx = 1; idx < len; idx++) {
+ ret = i2c_smbus_read_byte(client);
+ if (ret < 0)
+ return ret;
+ buf[idx] = ret;
+ }
+ }
return ret;
}
@@ -88,21 +103,32 @@ static int
isl1208_i2c_set_regs(struct i2c_client *client, u8 reg, u8 const buf[],
unsigned len)
{
- u8 i2c_buf[ISL1208_REG_USR2 + 2];
- struct i2c_msg msgs[1] = {
- {client->addr, 0, len + 1, i2c_buf}
- };
- int ret;
+ int ret = 0;
BUG_ON(reg > ISL1208_REG_USR2);
BUG_ON(reg + len > ISL1208_REG_USR2 + 1);
- i2c_buf[0] = reg;
- memcpy(&i2c_buf[1], &buf[0], len);
+ if (i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
+ u8 i2c_buf[ISL1208_REG_USR2 + 2];
+ struct i2c_msg msgs[1] = {
+ {client->addr, 0, len + 1, i2c_buf}
+ };
+
+ i2c_buf[0] = reg;
+ memcpy(&i2c_buf[1], &buf[0], len);
- ret = i2c_transfer(client->adapter, msgs, 1);
- if (ret > 0)
- ret = 0;
+ ret = i2c_transfer(client->adapter, msgs, 1);
+ if (ret > 0)
+ ret = 0;
+ } else {
+ int idx;
+ for (idx = 0; idx < len; idx++) {
+ ret = i2c_smbus_write_byte_data(client, reg + idx,
+ buf[idx]);
+ if (ret < 0)
+ return ret;
+ }
+ }
return ret;
}
@@ -622,7 +648,9 @@ isl1208_probe(struct i2c_client *client, const struct i2c_device_id *id)
int rc = 0;
struct rtc_device *rtc;
- if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
+ if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C) &&
+ !i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE |
+ I2C_FUNC_SMBUS_BYTE_DATA))
return -ENODEV;
if (isl1208_i2c_validate_client(client) < 0)
--
1.7.7
--
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