rtc: rx8581: switch to regmap
Switch to regmap to simplify handling block read/write. Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>hifive-unleashed-5.1
Alexandre Belloni
parent
6e6111f6c0
commit
94389b28ba
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@ -15,6 +15,7 @@
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#include <linux/module.h>
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#include <linux/i2c.h>
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#include <linux/bcd.h>
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#include <linux/regmap.h>
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#include <linux/rtc.h>
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#include <linux/log2.h>
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@ -51,42 +52,10 @@
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#define RX8581_CTRL_RESET 0x01 /* RESET bit */
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struct rx8581 {
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struct i2c_client *client;
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struct regmap *regmap;
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struct rtc_device *rtc;
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s32 (*read_block_data)(const struct i2c_client *client, u8 command,
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u8 length, u8 *values);
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s32 (*write_block_data)(const struct i2c_client *client, u8 command,
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u8 length, const u8 *values);
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};
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static int rx8581_read_block_data(const struct i2c_client *client, u8 command,
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u8 length, u8 *values)
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{
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s32 i, data;
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for (i = 0; i < length; i++) {
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data = i2c_smbus_read_byte_data(client, command + i);
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if (data < 0)
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return data;
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values[i] = data;
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}
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return i;
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}
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static int rx8581_write_block_data(const struct i2c_client *client, u8 command,
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u8 length, const u8 *values)
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{
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s32 i, ret;
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for (i = 0; i < length; i++) {
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ret = i2c_smbus_write_byte_data(client, command + i,
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values[i]);
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if (ret < 0)
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return ret;
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}
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return length;
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}
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/*
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* In the routines that deal directly with the rx8581 hardware, we use
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* rtc_time -- month 0-11, hour 0-23, yr = calendar year-epoch.
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@ -95,7 +64,8 @@ static int rx8581_rtc_read_time(struct device *dev, struct rtc_time *tm)
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{
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struct i2c_client *client = to_i2c_client(dev);
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unsigned char date[7];
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int data, err;
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unsigned int data;
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int err;
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struct rx8581 *rx8581 = i2c_get_clientdata(client);
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/* First we ensure that the "update flag" is not set, we read the
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@ -103,11 +73,9 @@ static int rx8581_rtc_read_time(struct device *dev, struct rtc_time *tm)
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* has been set, we know that the time has changed during the read so
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* we repeat the whole process again.
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*/
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data = i2c_smbus_read_byte_data(client, RX8581_REG_FLAG);
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if (data < 0) {
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dev_err(dev, "Unable to read device flags\n");
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return -EIO;
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}
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err = regmap_read(rx8581->regmap, RX8581_REG_FLAG, &data);
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if (err < 0)
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return err;
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if (data & RX8581_FLAG_VLF) {
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dev_warn(dev,
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@ -118,28 +86,22 @@ static int rx8581_rtc_read_time(struct device *dev, struct rtc_time *tm)
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do {
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/* If update flag set, clear it */
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if (data & RX8581_FLAG_UF) {
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err = i2c_smbus_write_byte_data(client,
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RX8581_REG_FLAG, (data & ~RX8581_FLAG_UF));
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if (err != 0) {
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dev_err(dev, "Unable to write device flags\n");
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return -EIO;
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}
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err = regmap_write(rx8581->regmap, RX8581_REG_FLAG,
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data & ~RX8581_FLAG_UF);
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if (err < 0)
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return err;
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}
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/* Now read time and date */
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err = rx8581->read_block_data(client, RX8581_REG_SC,
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7, date);
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if (err < 0) {
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dev_err(dev, "Unable to read date\n");
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return -EIO;
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}
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err = regmap_bulk_read(rx8581->regmap, RX8581_REG_SC, date,
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sizeof(date));
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if (err < 0)
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return err;
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/* Check flag register */
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data = i2c_smbus_read_byte_data(client, RX8581_REG_FLAG);
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if (data < 0) {
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dev_err(dev, "Unable to read device flags\n");
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return -EIO;
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}
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err = regmap_read(rx8581->regmap, RX8581_REG_FLAG, &data);
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if (err < 0)
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return err;
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} while (data & RX8581_FLAG_UF);
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dev_dbg(dev, "%s: raw data is sec=%02x, min=%02x, hr=%02x, "
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@ -167,7 +129,7 @@ static int rx8581_rtc_read_time(struct device *dev, struct rtc_time *tm)
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static int rx8581_rtc_set_time(struct device *dev, struct rtc_time *tm)
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{
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struct i2c_client *client = to_i2c_client(dev);
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int data, err;
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int err;
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unsigned char buf[7];
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struct rx8581 *rx8581 = i2c_get_clientdata(client);
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@ -192,55 +154,26 @@ static int rx8581_rtc_set_time(struct device *dev, struct rtc_time *tm)
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buf[RX8581_REG_DW] = (0x1 << tm->tm_wday);
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/* Stop the clock */
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data = i2c_smbus_read_byte_data(client, RX8581_REG_CTRL);
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if (data < 0) {
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dev_err(dev, "Unable to read control register\n");
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return -EIO;
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}
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err = i2c_smbus_write_byte_data(client, RX8581_REG_CTRL,
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(data | RX8581_CTRL_STOP));
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if (err < 0) {
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dev_err(dev, "Unable to write control register\n");
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return -EIO;
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}
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err = regmap_update_bits(rx8581->regmap, RX8581_REG_CTRL,
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RX8581_CTRL_STOP, RX8581_CTRL_STOP);
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if (err < 0)
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return err;
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/* write register's data */
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err = rx8581->write_block_data(client, RX8581_REG_SC, 7, buf);
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if (err < 0) {
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dev_err(dev, "Unable to write to date registers\n");
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return -EIO;
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}
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err = regmap_bulk_write(rx8581->regmap, RX8581_REG_SC,
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buf, sizeof(buf));
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if (err < 0)
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return err;
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/* get VLF and clear it */
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data = i2c_smbus_read_byte_data(client, RX8581_REG_FLAG);
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if (data < 0) {
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dev_err(dev, "Unable to read flag register\n");
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return -EIO;
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}
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err = i2c_smbus_write_byte_data(client, RX8581_REG_FLAG,
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(data & ~(RX8581_FLAG_VLF)));
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if (err != 0) {
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dev_err(dev, "Unable to write flag register\n");
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return -EIO;
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}
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err = regmap_update_bits(rx8581->regmap, RX8581_REG_FLAG,
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RX8581_FLAG_VLF, 0);
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if (err < 0)
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return err;
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/* Restart the clock */
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data = i2c_smbus_read_byte_data(client, RX8581_REG_CTRL);
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if (data < 0) {
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dev_err(dev, "Unable to read control register\n");
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return -EIO;
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}
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err = i2c_smbus_write_byte_data(client, RX8581_REG_CTRL,
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(data & ~(RX8581_CTRL_STOP)));
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if (err != 0) {
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dev_err(dev, "Unable to write control register\n");
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return -EIO;
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}
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return 0;
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return regmap_update_bits(rx8581->regmap, RX8581_REG_CTRL,
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RX8581_CTRL_STOP, 0);
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}
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static const struct rtc_class_ops rx8581_rtc_ops = {
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@ -252,27 +185,23 @@ static int rx8581_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct rx8581 *rx8581;
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static const struct regmap_config config = {
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.reg_bits = 8,
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.val_bits = 8,
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.max_register = 0xf,
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};
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dev_dbg(&client->dev, "%s\n", __func__);
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if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA)
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&& !i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_I2C_BLOCK))
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return -EIO;
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rx8581 = devm_kzalloc(&client->dev, sizeof(struct rx8581), GFP_KERNEL);
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if (!rx8581)
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return -ENOMEM;
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i2c_set_clientdata(client, rx8581);
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rx8581->client = client;
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if (i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_I2C_BLOCK)) {
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rx8581->read_block_data = i2c_smbus_read_i2c_block_data;
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rx8581->write_block_data = i2c_smbus_write_i2c_block_data;
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} else {
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rx8581->read_block_data = rx8581_read_block_data;
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rx8581->write_block_data = rx8581_write_block_data;
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}
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rx8581->regmap = devm_regmap_init_i2c(client, &config);
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if (IS_ERR(rx8581->regmap))
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return PTR_ERR(rx8581->regmap);
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rx8581->rtc = devm_rtc_allocate_device(&client->dev);
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if (IS_ERR(rx8581->rtc))
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