diff options
author | Bartosz Golaszewski <bgolaszewski@baylibre.com> | 2020-09-14 17:46:00 +0200 |
---|---|---|
committer | Alexandre Belloni <alexandre.belloni@bootlin.com> | 2020-09-15 10:50:38 +0200 |
commit | 9868bc1ce272dc0387488e779c585e7a12cf7a1b (patch) | |
tree | e91da64b952d214dbd5f60398422c7924551de8b /drivers/rtc | |
parent | cee015d90d96495d8376871af0f1a33027303d5e (diff) | |
download | linux-9868bc1ce272dc0387488e779c585e7a12cf7a1b.tar.bz2 |
rtc: rx8010: convert to using regmap
This driver requires SMBUS to work. We can relax this requirement if we
switch to using i2c regmap and let the regmap sub-system figure out how
to talk to the bus.
This also has the advantage of shrinking the code for register updates.
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20200914154601.32245-14-brgl@bgdev.pl
Diffstat (limited to 'drivers/rtc')
-rw-r--r-- | drivers/rtc/rtc-rx8010.c | 198 |
1 files changed, 79 insertions, 119 deletions
diff --git a/drivers/rtc/rtc-rx8010.c b/drivers/rtc/rtc-rx8010.c index 3c82f7d48a65..b8aa98fb62de 100644 --- a/drivers/rtc/rtc-rx8010.c +++ b/drivers/rtc/rtc-rx8010.c @@ -11,6 +11,7 @@ #include <linux/i2c.h> #include <linux/kernel.h> #include <linux/module.h> +#include <linux/regmap.h> #include <linux/rtc.h> #define RX8010_SEC 0x10 @@ -61,7 +62,7 @@ static const struct of_device_id rx8010_of_match[] = { MODULE_DEVICE_TABLE(of, rx8010_of_match); struct rx8010_data { - struct i2c_client *client; + struct regmap *regs; struct rtc_device *rtc; u8 ctrlreg; }; @@ -70,13 +71,12 @@ static irqreturn_t rx8010_irq_1_handler(int irq, void *dev_id) { struct i2c_client *client = dev_id; struct rx8010_data *rx8010 = i2c_get_clientdata(client); - int flagreg; + int flagreg, err; mutex_lock(&rx8010->rtc->ops_lock); - flagreg = i2c_smbus_read_byte_data(client, RX8010_FLAG); - - if (flagreg <= 0) { + err = regmap_read(rx8010->regs, RX8010_FLAG, &flagreg); + if (err) { mutex_unlock(&rx8010->rtc->ops_lock); return IRQ_NONE; } @@ -99,10 +99,9 @@ static irqreturn_t rx8010_irq_1_handler(int irq, void *dev_id) rtc_update_irq(rx8010->rtc, 1, RTC_UF | RTC_IRQF); } - i2c_smbus_write_byte_data(client, RX8010_FLAG, flagreg); - + err = regmap_write(rx8010->regs, RX8010_FLAG, flagreg); mutex_unlock(&rx8010->rtc->ops_lock); - return IRQ_HANDLED; + return err ? IRQ_NONE : IRQ_HANDLED; } static int rx8010_get_time(struct device *dev, struct rtc_time *dt) @@ -111,19 +110,18 @@ static int rx8010_get_time(struct device *dev, struct rtc_time *dt) u8 date[RX8010_YEAR - RX8010_SEC + 1]; int flagreg, err; - flagreg = i2c_smbus_read_byte_data(rx8010->client, RX8010_FLAG); - if (flagreg < 0) - return flagreg; + err = regmap_read(rx8010->regs, RX8010_FLAG, &flagreg); + if (err) + return err; if (flagreg & RX8010_FLAG_VLF) { dev_warn(dev, "Frequency stop detected\n"); return -EINVAL; } - err = i2c_smbus_read_i2c_block_data(rx8010->client, RX8010_SEC, - sizeof(date), date); - if (err != sizeof(date)) - return err < 0 ? err : -EIO; + err = regmap_bulk_read(rx8010->regs, RX8010_SEC, date, sizeof(date)); + if (err) + return err; dt->tm_sec = bcd2bin(date[RX8010_SEC - RX8010_SEC] & 0x7f); dt->tm_min = bcd2bin(date[RX8010_MIN - RX8010_SEC] & 0x7f); @@ -140,19 +138,14 @@ static int rx8010_set_time(struct device *dev, struct rtc_time *dt) { struct rx8010_data *rx8010 = dev_get_drvdata(dev); u8 date[RX8010_YEAR - RX8010_SEC + 1]; - int ctrl, flagreg, err; + int err; if ((dt->tm_year < 100) || (dt->tm_year > 199)) return -EINVAL; /* set STOP bit before changing clock/calendar */ - ctrl = i2c_smbus_read_byte_data(rx8010->client, RX8010_CTRL); - if (ctrl < 0) - return ctrl; - rx8010->ctrlreg = ctrl | RX8010_CTRL_STOP; - err = i2c_smbus_write_byte_data(rx8010->client, RX8010_CTRL, - rx8010->ctrlreg); - if (err < 0) + err = regmap_set_bits(rx8010->regs, RX8010_CTRL, RX8010_CTRL_STOP); + if (err) return err; date[RX8010_SEC - RX8010_SEC] = bin2bcd(dt->tm_sec); @@ -163,66 +156,54 @@ static int rx8010_set_time(struct device *dev, struct rtc_time *dt) date[RX8010_YEAR - RX8010_SEC] = bin2bcd(dt->tm_year - 100); date[RX8010_WDAY - RX8010_SEC] = bin2bcd(1 << dt->tm_wday); - err = i2c_smbus_write_i2c_block_data(rx8010->client, - RX8010_SEC, sizeof(date), - date); - if (err < 0) + err = regmap_bulk_write(rx8010->regs, RX8010_SEC, date, sizeof(date)); + if (err) return err; /* clear STOP bit after changing clock/calendar */ - ctrl = i2c_smbus_read_byte_data(rx8010->client, RX8010_CTRL); - if (ctrl < 0) - return ctrl; - rx8010->ctrlreg = ctrl & ~RX8010_CTRL_STOP; - err = i2c_smbus_write_byte_data(rx8010->client, RX8010_CTRL, - rx8010->ctrlreg); - if (err < 0) + err = regmap_clear_bits(rx8010->regs, RX8010_CTRL, RX8010_CTRL_STOP); + if (err) return err; - flagreg = i2c_smbus_read_byte_data(rx8010->client, RX8010_FLAG); - if (flagreg < 0) - return flagreg; - - if (flagreg & RX8010_FLAG_VLF) - err = i2c_smbus_write_byte_data(rx8010->client, RX8010_FLAG, - flagreg & ~RX8010_FLAG_VLF); + err = regmap_clear_bits(rx8010->regs, RX8010_FLAG, RX8010_FLAG_VLF); + if (err) + return err; return 0; } -static int rx8010_init_client(struct i2c_client *client) +static int rx8010_init_client(struct device *dev) { - struct rx8010_data *rx8010 = i2c_get_clientdata(client); + struct rx8010_data *rx8010 = dev_get_drvdata(dev); u8 ctrl[2]; int need_clear = 0, err; /* Initialize reserved registers as specified in datasheet */ - err = i2c_smbus_write_byte_data(client, RX8010_RESV17, 0xD8); - if (err < 0) + err = regmap_write(rx8010->regs, RX8010_RESV17, 0xD8); + if (err) return err; - err = i2c_smbus_write_byte_data(client, RX8010_RESV30, 0x00); - if (err < 0) + err = regmap_write(rx8010->regs, RX8010_RESV30, 0x00); + if (err) return err; - err = i2c_smbus_write_byte_data(client, RX8010_RESV31, 0x08); - if (err < 0) + err = regmap_write(rx8010->regs, RX8010_RESV31, 0x08); + if (err) return err; - err = i2c_smbus_write_byte_data(client, RX8010_IRQ, 0x00); - if (err < 0) + err = regmap_write(rx8010->regs, RX8010_IRQ, 0x00); + if (err) return err; - err = i2c_smbus_read_i2c_block_data(rx8010->client, RX8010_FLAG, - 2, ctrl); - if (err != 2) - return err < 0 ? err : -EIO; + err = regmap_bulk_read(rx8010->regs, RX8010_FLAG, ctrl, 2); + if (err) + return err; if (ctrl[0] & RX8010_FLAG_VLF) - dev_warn(&client->dev, "Frequency stop was detected\n"); + dev_warn(dev, "Frequency stop was detected\n"); if (ctrl[0] & RX8010_FLAG_AF) { - dev_warn(&client->dev, "Alarm was detected\n"); + dev_warn(dev, "Alarm was detected\n"); need_clear = 1; } @@ -234,8 +215,8 @@ static int rx8010_init_client(struct i2c_client *client) if (need_clear) { ctrl[0] &= ~(RX8010_FLAG_AF | RX8010_FLAG_TF | RX8010_FLAG_UF); - err = i2c_smbus_write_byte_data(client, RX8010_FLAG, ctrl[0]); - if (err < 0) + err = regmap_write(rx8010->regs, RX8010_FLAG, ctrl[0]); + if (err) return err; } @@ -247,17 +228,16 @@ static int rx8010_init_client(struct i2c_client *client) static int rx8010_read_alarm(struct device *dev, struct rtc_wkalrm *t) { struct rx8010_data *rx8010 = dev_get_drvdata(dev); - struct i2c_client *client = rx8010->client; u8 alarmvals[3]; int flagreg, err; - err = i2c_smbus_read_i2c_block_data(client, RX8010_ALMIN, 3, alarmvals); - if (err != 3) - return err < 0 ? err : -EIO; + err = regmap_bulk_read(rx8010->regs, RX8010_ALMIN, alarmvals, 3); + if (err) + return err; - flagreg = i2c_smbus_read_byte_data(client, RX8010_FLAG); - if (flagreg < 0) - return flagreg; + err = regmap_read(rx8010->regs, RX8010_FLAG, &flagreg); + if (err) + return err; t->time.tm_sec = 0; t->time.tm_min = bcd2bin(alarmvals[0] & 0x7f); @@ -274,52 +254,38 @@ static int rx8010_read_alarm(struct device *dev, struct rtc_wkalrm *t) static int rx8010_set_alarm(struct device *dev, struct rtc_wkalrm *t) { - struct i2c_client *client = to_i2c_client(dev); struct rx8010_data *rx8010 = dev_get_drvdata(dev); u8 alarmvals[3]; - int extreg, flagreg, err; - - flagreg = i2c_smbus_read_byte_data(client, RX8010_FLAG); - if (flagreg < 0) - return flagreg; + int err; if (rx8010->ctrlreg & (RX8010_CTRL_AIE | RX8010_CTRL_UIE)) { rx8010->ctrlreg &= ~(RX8010_CTRL_AIE | RX8010_CTRL_UIE); - err = i2c_smbus_write_byte_data(rx8010->client, RX8010_CTRL, - rx8010->ctrlreg); - if (err < 0) + err = regmap_write(rx8010->regs, RX8010_CTRL, rx8010->ctrlreg); + if (err) return err; } - flagreg &= ~RX8010_FLAG_AF; - err = i2c_smbus_write_byte_data(rx8010->client, RX8010_FLAG, flagreg); - if (err < 0) + err = regmap_clear_bits(rx8010->regs, RX8010_FLAG, RX8010_FLAG_AF); + if (err) return err; alarmvals[0] = bin2bcd(t->time.tm_min); alarmvals[1] = bin2bcd(t->time.tm_hour); alarmvals[2] = bin2bcd(t->time.tm_mday); - err = i2c_smbus_write_i2c_block_data(rx8010->client, RX8010_ALMIN, - 2, alarmvals); - if (err < 0) + err = regmap_bulk_write(rx8010->regs, RX8010_ALMIN, alarmvals, 2); + if (err) return err; - extreg = i2c_smbus_read_byte_data(client, RX8010_EXT); - if (extreg < 0) - return extreg; - - extreg |= RX8010_EXT_WADA; - err = i2c_smbus_write_byte_data(rx8010->client, RX8010_EXT, extreg); - if (err < 0) + err = regmap_clear_bits(rx8010->regs, RX8010_EXT, RX8010_EXT_WADA); + if (err) return err; if (alarmvals[2] == 0) alarmvals[2] |= RX8010_ALARM_AE; - err = i2c_smbus_write_byte_data(rx8010->client, RX8010_ALWDAY, - alarmvals[2]); - if (err < 0) + err = regmap_write(rx8010->regs, RX8010_ALWDAY, alarmvals[2]); + if (err) return err; if (t->enabled) { @@ -329,9 +295,8 @@ static int rx8010_set_alarm(struct device *dev, struct rtc_wkalrm *t) rx8010->ctrlreg |= (RX8010_CTRL_AIE | RX8010_CTRL_UIE); - err = i2c_smbus_write_byte_data(rx8010->client, RX8010_CTRL, - rx8010->ctrlreg); - if (err < 0) + err = regmap_write(rx8010->regs, RX8010_CTRL, rx8010->ctrlreg); + if (err) return err; } @@ -341,9 +306,8 @@ static int rx8010_set_alarm(struct device *dev, struct rtc_wkalrm *t) static int rx8010_alarm_irq_enable(struct device *dev, unsigned int enabled) { - struct i2c_client *client = to_i2c_client(dev); struct rx8010_data *rx8010 = dev_get_drvdata(dev); - int flagreg, err; + int err; u8 ctrl; ctrl = rx8010->ctrlreg; @@ -360,20 +324,14 @@ static int rx8010_alarm_irq_enable(struct device *dev, ctrl &= ~RX8010_CTRL_AIE; } - flagreg = i2c_smbus_read_byte_data(client, RX8010_FLAG); - if (flagreg < 0) - return flagreg; - - flagreg &= ~RX8010_FLAG_AF; - err = i2c_smbus_write_byte_data(rx8010->client, RX8010_FLAG, flagreg); - if (err < 0) + err = regmap_clear_bits(rx8010->regs, RX8010_FLAG, RX8010_FLAG_AF); + if (err) return err; if (ctrl != rx8010->ctrlreg) { rx8010->ctrlreg = ctrl; - err = i2c_smbus_write_byte_data(rx8010->client, RX8010_CTRL, - rx8010->ctrlreg); - if (err < 0) + err = regmap_write(rx8010->regs, RX8010_CTRL, rx8010->ctrlreg); + if (err) return err; } @@ -383,13 +341,13 @@ static int rx8010_alarm_irq_enable(struct device *dev, static int rx8010_ioctl(struct device *dev, unsigned int cmd, unsigned long arg) { struct rx8010_data *rx8010 = dev_get_drvdata(dev); - int tmp, flagreg; + int tmp, flagreg, err; switch (cmd) { case RTC_VL_READ: - flagreg = i2c_smbus_read_byte_data(rx8010->client, RX8010_FLAG); - if (flagreg < 0) - return flagreg; + err = regmap_read(rx8010->regs, RX8010_FLAG, &flagreg); + if (err) + return err; tmp = flagreg & RX8010_FLAG_VLF ? RTC_VL_DATA_INVALID : 0; return put_user(tmp, (unsigned int __user *)arg); @@ -414,27 +372,29 @@ static const struct rtc_class_ops rx8010_rtc_ops_alarm = { .alarm_irq_enable = rx8010_alarm_irq_enable, }; +static const struct regmap_config rx8010_regmap_config = { + .name = "rx8010-rtc", + .reg_bits = 8, + .val_bits = 8, +}; + static int rx8010_probe(struct i2c_client *client) { - struct i2c_adapter *adapter = client->adapter; struct device *dev = &client->dev; struct rx8010_data *rx8010; int err = 0; - if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA - | I2C_FUNC_SMBUS_I2C_BLOCK)) { - dev_err(&adapter->dev, "doesn't support required functionality\n"); - return -EIO; - } - rx8010 = devm_kzalloc(dev, sizeof(*rx8010), GFP_KERNEL); if (!rx8010) return -ENOMEM; - rx8010->client = client; i2c_set_clientdata(client, rx8010); - err = rx8010_init_client(client); + rx8010->regs = devm_regmap_init_i2c(client, &rx8010_regmap_config); + if (IS_ERR(rx8010->regs)) + return PTR_ERR(rx8010->regs); + + err = rx8010_init_client(dev); if (err) return err; |