From f2b84ee88d367dd563c25b6900da279ab2ffa3ea Mon Sep 17 00:00:00 2001 From: =?utf8?q?Myl=C3=A8ne=20Josserand?= Date: Tue, 29 Mar 2016 08:56:00 +0200 Subject: [PATCH] rtc: m41t80: replace i2c functions for smbus ones MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit The driver used i2c_transfer methods to read and set date/time. The smbus methods should be used. This commit replaces i2c_transfer functions by i2c_smbus_XX_i2c_block_data for reading and setting the datetime. Signed-off-by: Mylène Josserand Signed-off-by: Alexandre Belloni --- drivers/rtc/rtc-m41t80.c | 134 +++++++++++++-------------------------- 1 file changed, 44 insertions(+), 90 deletions(-) diff --git a/drivers/rtc/rtc-m41t80.c b/drivers/rtc/rtc-m41t80.c index cc8b93d2edf5..1a769275ab9d 100644 --- a/drivers/rtc/rtc-m41t80.c +++ b/drivers/rtc/rtc-m41t80.c @@ -32,21 +32,21 @@ #include #endif -#define M41T80_REG_SSEC 0 -#define M41T80_REG_SEC 1 -#define M41T80_REG_MIN 2 -#define M41T80_REG_HOUR 3 -#define M41T80_REG_WDAY 4 -#define M41T80_REG_DAY 5 -#define M41T80_REG_MON 6 -#define M41T80_REG_YEAR 7 -#define M41T80_REG_ALARM_MON 0xa -#define M41T80_REG_ALARM_DAY 0xb -#define M41T80_REG_ALARM_HOUR 0xc -#define M41T80_REG_ALARM_MIN 0xd -#define M41T80_REG_ALARM_SEC 0xe -#define M41T80_REG_FLAGS 0xf -#define M41T80_REG_SQW 0x13 +#define M41T80_REG_SSEC 0x00 +#define M41T80_REG_SEC 0x01 +#define M41T80_REG_MIN 0x02 +#define M41T80_REG_HOUR 0x03 +#define M41T80_REG_WDAY 0x04 +#define M41T80_REG_DAY 0x05 +#define M41T80_REG_MON 0x06 +#define M41T80_REG_YEAR 0x07 +#define M41T80_REG_ALARM_MON 0x0a +#define M41T80_REG_ALARM_DAY 0x0b +#define M41T80_REG_ALARM_HOUR 0x0c +#define M41T80_REG_ALARM_MIN 0x0d +#define M41T80_REG_ALARM_SEC 0x0e +#define M41T80_REG_FLAGS 0x0f +#define M41T80_REG_SQW 0x13 #define M41T80_DATETIME_REG_SIZE (M41T80_REG_YEAR + 1) #define M41T80_ALARM_REG_SIZE \ @@ -93,24 +93,13 @@ struct m41t80_data { static int m41t80_get_datetime(struct i2c_client *client, struct rtc_time *tm) { - u8 buf[M41T80_DATETIME_REG_SIZE], dt_addr[1] = { M41T80_REG_SEC }; - struct i2c_msg msgs[] = { - { - .addr = client->addr, - .flags = 0, - .len = 1, - .buf = dt_addr, - }, - { - .addr = client->addr, - .flags = I2C_M_RD, - .len = M41T80_DATETIME_REG_SIZE - M41T80_REG_SEC, - .buf = buf + M41T80_REG_SEC, - }, - }; + unsigned char buf[8]; + int err; - if (i2c_transfer(client->adapter, msgs, 2) < 0) { - dev_err(&client->dev, "read error\n"); + err = i2c_smbus_read_i2c_block_data(client, M41T80_REG_SSEC, + sizeof(buf), buf); + if (err < 0) { + dev_err(&client->dev, "Unable to read date\n"); return -EIO; } @@ -129,67 +118,29 @@ static int m41t80_get_datetime(struct i2c_client *client, /* Sets the given date and time to the real time clock. */ static int m41t80_set_datetime(struct i2c_client *client, struct rtc_time *tm) { - u8 wbuf[1 + M41T80_DATETIME_REG_SIZE]; - u8 *buf = &wbuf[1]; - u8 dt_addr[1] = { M41T80_REG_SEC }; - struct i2c_msg msgs_in[] = { - { - .addr = client->addr, - .flags = 0, - .len = 1, - .buf = dt_addr, - }, - { - .addr = client->addr, - .flags = I2C_M_RD, - .len = M41T80_DATETIME_REG_SIZE - M41T80_REG_SEC, - .buf = buf + M41T80_REG_SEC, - }, - }; - struct i2c_msg msgs[] = { - { - .addr = client->addr, - .flags = 0, - .len = 1 + M41T80_DATETIME_REG_SIZE, - .buf = wbuf, - }, - }; + unsigned char buf[8]; + int err; - /* Read current reg values into buf[1..7] */ - if (i2c_transfer(client->adapter, msgs_in, 2) < 0) { - dev_err(&client->dev, "read error\n"); - return -EIO; - } + if (tm->tm_year < 100 || tm->tm_year > 199) + return -EINVAL; - wbuf[0] = 0; /* offset into rtc's regs */ - /* Merge time-data and register flags into buf[0..7] */ buf[M41T80_REG_SSEC] = 0; - buf[M41T80_REG_SEC] = - bin2bcd(tm->tm_sec) | (buf[M41T80_REG_SEC] & ~0x7f); - buf[M41T80_REG_MIN] = - bin2bcd(tm->tm_min) | (buf[M41T80_REG_MIN] & ~0x7f); - buf[M41T80_REG_HOUR] = - bin2bcd(tm->tm_hour) | (buf[M41T80_REG_HOUR] & ~0x3f); - buf[M41T80_REG_WDAY] = - (tm->tm_wday & 0x07) | (buf[M41T80_REG_WDAY] & ~0x07); - buf[M41T80_REG_DAY] = - bin2bcd(tm->tm_mday) | (buf[M41T80_REG_DAY] & ~0x3f); - buf[M41T80_REG_MON] = - bin2bcd(tm->tm_mon + 1) | (buf[M41T80_REG_MON] & ~0x1f); - - /* assume 20YY not 19YY */ - if (tm->tm_year < 100 || tm->tm_year > 199) { - dev_err(&client->dev, "Year must be between 2000 and 2099. It's %d.\n", - tm->tm_year + 1900); - return -EINVAL; + buf[M41T80_REG_SEC] = bin2bcd(tm->tm_sec); + buf[M41T80_REG_MIN] = bin2bcd(tm->tm_min); + buf[M41T80_REG_HOUR] = bin2bcd(tm->tm_hour); + buf[M41T80_REG_DAY] = bin2bcd(tm->tm_mday); + buf[M41T80_REG_MON] = bin2bcd(tm->tm_mon + 1); + buf[M41T80_REG_YEAR] = bin2bcd(tm->tm_year - 100); + buf[M41T80_REG_WDAY] = tm->tm_wday; + + err = i2c_smbus_write_i2c_block_data(client, M41T80_REG_SSEC, + sizeof(buf), buf); + if (err < 0) { + dev_err(&client->dev, "Unable to write to date registers\n"); + return err; } - buf[M41T80_REG_YEAR] = bin2bcd(tm->tm_year % 100); - if (i2c_transfer(client->adapter, msgs, 1) != 1) { - dev_err(&client->dev, "write error\n"); - return -EIO; - } - return 0; + return err; } static int m41t80_rtc_proc(struct device *dev, struct seq_file *seq) @@ -631,14 +582,17 @@ static void m41t80_remove_sysfs_group(void *_dev) static int m41t80_probe(struct i2c_client *client, const struct i2c_device_id *id) { + struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent); int rc = 0; struct rtc_device *rtc = NULL; struct rtc_time tm; struct m41t80_data *clientdata = NULL; - if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C - | I2C_FUNC_SMBUS_BYTE_DATA)) + if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_I2C_BLOCK | + I2C_FUNC_SMBUS_BYTE_DATA)) { + dev_err(&adapter->dev, "doesn't support I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_I2C_BLOCK\n"); return -ENODEV; + } clientdata = devm_kzalloc(&client->dev, sizeof(*clientdata), GFP_KERNEL); -- 2.20.1