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author | Alexandre Belloni <alexandre.belloni@bootlin.com> | 2018-05-17 22:33:31 +0200 |
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committer | Alexandre Belloni <alexandre.belloni@bootlin.com> | 2018-05-17 22:43:22 +0200 |
commit | 94389b28ba6c03eecf45105026c1f9978481a706 (patch) | |
tree | d3f02d7c1e1f71901a056aab4db19db15569794e | |
parent | 6e6111f6c08dcc34c8bc3b3a2a4f944ceeaa78be (diff) | |
download | linux-94389b28ba6c03eecf45105026c1f9978481a706.tar.bz2 |
rtc: rx8581: switch to regmap
Switch to regmap to simplify handling block read/write.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
-rw-r--r-- | drivers/rtc/rtc-rx8581.c | 155 |
1 files changed, 42 insertions, 113 deletions
diff --git a/drivers/rtc/rtc-rx8581.c b/drivers/rtc/rtc-rx8581.c index 54631a3ab65f..eac882169744 100644 --- a/drivers/rtc/rtc-rx8581.c +++ b/drivers/rtc/rtc-rx8581.c @@ -15,6 +15,7 @@ #include <linux/module.h> #include <linux/i2c.h> #include <linux/bcd.h> +#include <linux/regmap.h> #include <linux/rtc.h> #include <linux/log2.h> @@ -51,42 +52,10 @@ #define RX8581_CTRL_RESET 0x01 /* RESET bit */ struct rx8581 { - struct i2c_client *client; + struct regmap *regmap; struct rtc_device *rtc; - s32 (*read_block_data)(const struct i2c_client *client, u8 command, - u8 length, u8 *values); - s32 (*write_block_data)(const struct i2c_client *client, u8 command, - u8 length, const u8 *values); }; -static int rx8581_read_block_data(const struct i2c_client *client, u8 command, - u8 length, u8 *values) -{ - s32 i, data; - - for (i = 0; i < length; i++) { - data = i2c_smbus_read_byte_data(client, command + i); - if (data < 0) - return data; - values[i] = data; - } - return i; -} - -static int rx8581_write_block_data(const struct i2c_client *client, u8 command, - u8 length, const u8 *values) -{ - s32 i, ret; - - for (i = 0; i < length; i++) { - ret = i2c_smbus_write_byte_data(client, command + i, - values[i]); - if (ret < 0) - return ret; - } - return length; -} - /* * In the routines that deal directly with the rx8581 hardware, we use * rtc_time -- month 0-11, hour 0-23, yr = calendar year-epoch. @@ -95,7 +64,8 @@ static int rx8581_rtc_read_time(struct device *dev, struct rtc_time *tm) { struct i2c_client *client = to_i2c_client(dev); unsigned char date[7]; - int data, err; + unsigned int data; + int err; struct rx8581 *rx8581 = i2c_get_clientdata(client); /* First we ensure that the "update flag" is not set, we read the @@ -103,11 +73,9 @@ static int rx8581_rtc_read_time(struct device *dev, struct rtc_time *tm) * has been set, we know that the time has changed during the read so * we repeat the whole process again. */ - data = i2c_smbus_read_byte_data(client, RX8581_REG_FLAG); - if (data < 0) { - dev_err(dev, "Unable to read device flags\n"); - return -EIO; - } + err = regmap_read(rx8581->regmap, RX8581_REG_FLAG, &data); + if (err < 0) + return err; if (data & RX8581_FLAG_VLF) { dev_warn(dev, @@ -118,28 +86,22 @@ static int rx8581_rtc_read_time(struct device *dev, struct rtc_time *tm) do { /* If update flag set, clear it */ if (data & RX8581_FLAG_UF) { - err = i2c_smbus_write_byte_data(client, - RX8581_REG_FLAG, (data & ~RX8581_FLAG_UF)); - if (err != 0) { - dev_err(dev, "Unable to write device flags\n"); - return -EIO; - } + err = regmap_write(rx8581->regmap, RX8581_REG_FLAG, + data & ~RX8581_FLAG_UF); + if (err < 0) + return err; } /* Now read time and date */ - err = rx8581->read_block_data(client, RX8581_REG_SC, - 7, date); - if (err < 0) { - dev_err(dev, "Unable to read date\n"); - return -EIO; - } + err = regmap_bulk_read(rx8581->regmap, RX8581_REG_SC, date, + sizeof(date)); + if (err < 0) + return err; /* Check flag register */ - data = i2c_smbus_read_byte_data(client, RX8581_REG_FLAG); - if (data < 0) { - dev_err(dev, "Unable to read device flags\n"); - return -EIO; - } + err = regmap_read(rx8581->regmap, RX8581_REG_FLAG, &data); + if (err < 0) + return err; } while (data & RX8581_FLAG_UF); dev_dbg(dev, "%s: raw data is sec=%02x, min=%02x, hr=%02x, " @@ -167,7 +129,7 @@ static int rx8581_rtc_read_time(struct device *dev, struct rtc_time *tm) static int rx8581_rtc_set_time(struct device *dev, struct rtc_time *tm) { struct i2c_client *client = to_i2c_client(dev); - int data, err; + int err; unsigned char buf[7]; struct rx8581 *rx8581 = i2c_get_clientdata(client); @@ -192,55 +154,26 @@ static int rx8581_rtc_set_time(struct device *dev, struct rtc_time *tm) buf[RX8581_REG_DW] = (0x1 << tm->tm_wday); /* Stop the clock */ - data = i2c_smbus_read_byte_data(client, RX8581_REG_CTRL); - if (data < 0) { - dev_err(dev, "Unable to read control register\n"); - return -EIO; - } - - err = i2c_smbus_write_byte_data(client, RX8581_REG_CTRL, - (data | RX8581_CTRL_STOP)); - if (err < 0) { - dev_err(dev, "Unable to write control register\n"); - return -EIO; - } + err = regmap_update_bits(rx8581->regmap, RX8581_REG_CTRL, + RX8581_CTRL_STOP, RX8581_CTRL_STOP); + if (err < 0) + return err; /* write register's data */ - err = rx8581->write_block_data(client, RX8581_REG_SC, 7, buf); - if (err < 0) { - dev_err(dev, "Unable to write to date registers\n"); - return -EIO; - } + err = regmap_bulk_write(rx8581->regmap, RX8581_REG_SC, + buf, sizeof(buf)); + if (err < 0) + return err; /* get VLF and clear it */ - data = i2c_smbus_read_byte_data(client, RX8581_REG_FLAG); - if (data < 0) { - dev_err(dev, "Unable to read flag register\n"); - return -EIO; - } - - err = i2c_smbus_write_byte_data(client, RX8581_REG_FLAG, - (data & ~(RX8581_FLAG_VLF))); - if (err != 0) { - dev_err(dev, "Unable to write flag register\n"); - return -EIO; - } + err = regmap_update_bits(rx8581->regmap, RX8581_REG_FLAG, + RX8581_FLAG_VLF, 0); + if (err < 0) + return err; /* Restart the clock */ - data = i2c_smbus_read_byte_data(client, RX8581_REG_CTRL); - if (data < 0) { - dev_err(dev, "Unable to read control register\n"); - return -EIO; - } - - err = i2c_smbus_write_byte_data(client, RX8581_REG_CTRL, - (data & ~(RX8581_CTRL_STOP))); - if (err != 0) { - dev_err(dev, "Unable to write control register\n"); - return -EIO; - } - - return 0; + return regmap_update_bits(rx8581->regmap, RX8581_REG_CTRL, + RX8581_CTRL_STOP, 0); } static const struct rtc_class_ops rx8581_rtc_ops = { @@ -252,27 +185,23 @@ static int rx8581_probe(struct i2c_client *client, const struct i2c_device_id *id) { struct rx8581 *rx8581; + static const struct regmap_config config = { + .reg_bits = 8, + .val_bits = 8, + .max_register = 0xf, + }; dev_dbg(&client->dev, "%s\n", __func__); - if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA) - && !i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_I2C_BLOCK)) - return -EIO; - rx8581 = devm_kzalloc(&client->dev, sizeof(struct rx8581), GFP_KERNEL); if (!rx8581) return -ENOMEM; i2c_set_clientdata(client, rx8581); - rx8581->client = client; - - if (i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_I2C_BLOCK)) { - rx8581->read_block_data = i2c_smbus_read_i2c_block_data; - rx8581->write_block_data = i2c_smbus_write_i2c_block_data; - } else { - rx8581->read_block_data = rx8581_read_block_data; - rx8581->write_block_data = rx8581_write_block_data; - } + + rx8581->regmap = devm_regmap_init_i2c(client, &config); + if (IS_ERR(rx8581->regmap)) + return PTR_ERR(rx8581->regmap); rx8581->rtc = devm_rtc_allocate_device(&client->dev); if (IS_ERR(rx8581->rtc)) |