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Message-Id: <1466493770-11895-7-git-send-email-andrew.smirnov@gmail.com>
Date: Tue, 21 Jun 2016 00:22:41 -0700
From: Andrey Smirnov <andrew.smirnov@...il.com>
To: rtc-linux@...glegroups.com
Cc: Andrey Smirnov <andrew.smirnov@...il.com>,
Alessandro Zummo <a.zummo@...ertech.it>,
Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
linux-kernel@...r.kernel.org, cphealy@...il.com
Subject: [PATCH v2 08/17] RTC: ds1307: Move chip sanity checking into a separate routine
Signed-off-by: Andrey Smirnov <andrew.smirnov@...il.com>
---
drivers/rtc/rtc-ds1307.c | 148 +++++++++++++++++++++++++----------------------
1 file changed, 79 insertions(+), 69 deletions(-)
diff --git a/drivers/rtc/rtc-ds1307.c b/drivers/rtc/rtc-ds1307.c
index 4fa09dc..d262db5 100644
--- a/drivers/rtc/rtc-ds1307.c
+++ b/drivers/rtc/rtc-ds1307.c
@@ -1422,79 +1422,20 @@ static int ds1307_chip_configure(struct ds1307 *ds1307)
return 0;
}
-static int ds1307_probe(struct i2c_client *client,
- const struct i2c_device_id *id)
+static int ds1307_chip_sanity_check(struct ds1307 *ds1307)
{
- struct ds1307 *ds1307;
- int err = -ENODEV;
- int tmp;
- struct chip_desc *chip = &chips[id->driver_data];
- struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
- unsigned char *buf;
- struct ds1307_platform_data *pdata = dev_get_platdata(&client->dev);
- irq_handler_t irq_handler = ds1307_irq;
-
- const struct rtc_class_ops *rtc_ops = &ds13xx_rtc_ops;
-
- if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)
- && !i2c_check_functionality(adapter, I2C_FUNC_SMBUS_I2C_BLOCK))
- return -EIO;
-
- ds1307 = devm_kzalloc(&client->dev, sizeof(struct ds1307), GFP_KERNEL);
- if (!ds1307)
- return -ENOMEM;
-
- i2c_set_clientdata(client, ds1307);
-
- ds1307->client = client;
- ds1307->type = id->driver_data;
-
- if (!pdata && client->dev.of_node)
- ds1307_trickle_of_init(client, chip);
- else if (pdata && pdata->trickle_charger_setup)
- chip->trickle_charger_setup = pdata->trickle_charger_setup;
-
- if (chip->trickle_charger_setup && chip->trickle_charger_reg) {
- dev_dbg(&client->dev, "writing trickle charger info 0x%x to 0x%x\n",
- DS13XX_TRICKLE_CHARGER_MAGIC | chip->trickle_charger_setup,
- chip->trickle_charger_reg);
- i2c_smbus_write_byte_data(client, chip->trickle_charger_reg,
- DS13XX_TRICKLE_CHARGER_MAGIC |
- chip->trickle_charger_setup);
- }
+ int tmp;
+ unsigned char *buf;
+ struct i2c_client *client = ds1307->client;
buf = ds1307->regs;
- if (i2c_check_functionality(adapter, I2C_FUNC_SMBUS_I2C_BLOCK)) {
- ds1307->read_block_data = ds1307_native_smbus_read_block_data;
- ds1307->write_block_data = ds1307_native_smbus_write_block_data;
- } else {
- ds1307->read_block_data = ds1307_read_block_data;
- ds1307->write_block_data = ds1307_write_block_data;
- }
-
- err = ds1307_chip_configure(ds1307);
- if (err < 0)
- return err;
-
- switch (ds1307->type) {
- case ds_1388:
- ds1307->offset = 1; /* Seconds starts at 1 */
- break;
- case mcp794xx:
- rtc_ops = &mcp794xx_rtc_ops;
- irq_handler = mcp794xx_irq;
- break;
- default:
- break;
- }
read_rtc:
/* read RTC registers */
tmp = ds1307->read_block_data(ds1307->client, ds1307->offset, 8, buf);
if (tmp != 8) {
dev_dbg(&client->dev, "read error %d\n", tmp);
- err = -EIO;
- goto exit;
+ return -EIO;
}
/*
@@ -1535,8 +1476,7 @@ read_rtc:
tmp = i2c_smbus_read_byte_data(client, DS1340_REG_FLAG);
if (tmp < 0) {
dev_dbg(&client->dev, "read error %d\n", tmp);
- err = -EIO;
- goto exit;
+ return -EIO;
}
/* oscillator fault? clear flag, and warn */
@@ -1566,6 +1506,79 @@ read_rtc:
break;
}
+ return 0;
+}
+
+static int ds1307_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct ds1307 *ds1307;
+ int err = -ENODEV;
+ int tmp;
+ struct chip_desc *chip = &chips[id->driver_data];
+ struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
+ unsigned char *buf;
+ struct ds1307_platform_data *pdata = dev_get_platdata(&client->dev);
+ irq_handler_t irq_handler = ds1307_irq;
+
+ const struct rtc_class_ops *rtc_ops = &ds13xx_rtc_ops;
+
+ if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)
+ && !i2c_check_functionality(adapter, I2C_FUNC_SMBUS_I2C_BLOCK))
+ return -EIO;
+
+ ds1307 = devm_kzalloc(&client->dev, sizeof(struct ds1307), GFP_KERNEL);
+ if (!ds1307)
+ return -ENOMEM;
+
+ i2c_set_clientdata(client, ds1307);
+
+ ds1307->client = client;
+ ds1307->type = id->driver_data;
+
+ if (!pdata && client->dev.of_node)
+ ds1307_trickle_of_init(client, chip);
+ else if (pdata && pdata->trickle_charger_setup)
+ chip->trickle_charger_setup = pdata->trickle_charger_setup;
+
+ if (chip->trickle_charger_setup && chip->trickle_charger_reg) {
+ dev_dbg(&client->dev, "writing trickle charger info 0x%x to 0x%x\n",
+ DS13XX_TRICKLE_CHARGER_MAGIC | chip->trickle_charger_setup,
+ chip->trickle_charger_reg);
+ i2c_smbus_write_byte_data(client, chip->trickle_charger_reg,
+ DS13XX_TRICKLE_CHARGER_MAGIC |
+ chip->trickle_charger_setup);
+ }
+
+ buf = ds1307->regs;
+ if (i2c_check_functionality(adapter, I2C_FUNC_SMBUS_I2C_BLOCK)) {
+ ds1307->read_block_data = ds1307_native_smbus_read_block_data;
+ ds1307->write_block_data = ds1307_native_smbus_write_block_data;
+ } else {
+ ds1307->read_block_data = ds1307_read_block_data;
+ ds1307->write_block_data = ds1307_write_block_data;
+ }
+
+ err = ds1307_chip_configure(ds1307);
+ if (err < 0)
+ return err;
+
+ switch (ds1307->type) {
+ case ds_1388:
+ ds1307->offset = 1; /* Seconds starts at 1 */
+ break;
+ case mcp794xx:
+ rtc_ops = &mcp794xx_rtc_ops;
+ irq_handler = mcp794xx_irq;
+ break;
+ default:
+ break;
+ }
+
+ err = ds1307_chip_sanity_check(ds1307);
+ if (err < 0)
+ return err;
+
tmp = ds1307->regs[DS1307_REG_HOUR];
switch (ds1307->type) {
case ds_1340:
@@ -1663,9 +1676,6 @@ read_rtc:
ds1307_clks_register(ds1307);
return 0;
-
-exit:
- return err;
}
static int ds1307_remove(struct i2c_client *client)
--
2.5.5
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