From dc9913a050f1898c6a77f4f5606bc194d530aafd Mon Sep 17 00:00:00 2001 From: Laxman Dewangan Date: Tue, 21 Feb 2012 18:21:34 +0530 Subject: [PATCH] mfd: Use regmap for tps65910 register access. Using regmap apis for accessing the device registers and using RBTREE caching mechanims for caching registers. Enabling caching of the registers which is used for voltage controls. By doing this, the modify_bits operation is faster as it does not involve the i2c register read from device, just read from cache. This results faster set voltage operation. Signed-off-by: Laxman Dewangan Reviewed-by: Mark Brown Signed-off-by: Samuel Ortiz --- drivers/mfd/Kconfig | 1 + drivers/mfd/tps65910.c | 123 +++++++++++++---------------------- include/linux/mfd/tps65910.h | 1 + 3 files changed, 48 insertions(+), 77 deletions(-) diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig index d92bea2c468f..16178e1d2ab4 100644 --- a/drivers/mfd/Kconfig +++ b/drivers/mfd/Kconfig @@ -177,6 +177,7 @@ config MFD_TPS65910 depends on I2C=y && GPIOLIB select MFD_CORE select GPIO_TPS65910 + select REGMAP_I2C help if you say yes here you get support for the TPS65910 series of Power Management chips. diff --git a/drivers/mfd/tps65910.c b/drivers/mfd/tps65910.c index 4392f6bca156..1c4f53efee74 100644 --- a/drivers/mfd/tps65910.c +++ b/drivers/mfd/tps65910.c @@ -16,10 +16,12 @@ #include #include #include +#include #include #include #include #include +#include #include static struct mfd_cell tps65910s[] = { @@ -38,99 +40,56 @@ static struct mfd_cell tps65910s[] = { static int tps65910_i2c_read(struct tps65910 *tps65910, u8 reg, int bytes, void *dest) { - struct i2c_client *i2c = tps65910->i2c_client; - struct i2c_msg xfer[2]; - int ret; - - /* Write register */ - xfer[0].addr = i2c->addr; - xfer[0].flags = 0; - xfer[0].len = 1; - xfer[0].buf = ® - - /* Read data */ - xfer[1].addr = i2c->addr; - xfer[1].flags = I2C_M_RD; - xfer[1].len = bytes; - xfer[1].buf = dest; - - ret = i2c_transfer(i2c->adapter, xfer, 2); - if (ret == 2) - ret = 0; - else if (ret >= 0) - ret = -EIO; - - return ret; + return regmap_bulk_read(tps65910->regmap, reg, dest, bytes); } static int tps65910_i2c_write(struct tps65910 *tps65910, u8 reg, - int bytes, void *src) + int bytes, void *src) { - struct i2c_client *i2c = tps65910->i2c_client; - /* we add 1 byte for device register */ - u8 msg[TPS65910_MAX_REGISTER + 1]; - int ret; - - if (bytes > TPS65910_MAX_REGISTER) - return -EINVAL; - - msg[0] = reg; - memcpy(&msg[1], src, bytes); - - ret = i2c_master_send(i2c, msg, bytes + 1); - if (ret < 0) - return ret; - if (ret != bytes + 1) - return -EIO; - return 0; + return regmap_bulk_write(tps65910->regmap, reg, src, bytes); } int tps65910_set_bits(struct tps65910 *tps65910, u8 reg, u8 mask) { - u8 data; - int err; - - mutex_lock(&tps65910->io_mutex); - err = tps65910_i2c_read(tps65910, reg, 1, &data); - if (err) { - dev_err(tps65910->dev, "read from reg %x failed\n", reg); - goto out; - } - - data |= mask; - err = tps65910_i2c_write(tps65910, reg, 1, &data); - if (err) - dev_err(tps65910->dev, "write to reg %x failed\n", reg); - -out: - mutex_unlock(&tps65910->io_mutex); - return err; + return regmap_update_bits(tps65910->regmap, reg, mask, mask); } EXPORT_SYMBOL_GPL(tps65910_set_bits); int tps65910_clear_bits(struct tps65910 *tps65910, u8 reg, u8 mask) { - u8 data; - int err; - - mutex_lock(&tps65910->io_mutex); - err = tps65910_i2c_read(tps65910, reg, 1, &data); - if (err) { - dev_err(tps65910->dev, "read from reg %x failed\n", reg); - goto out; - } - - data &= ~mask; - err = tps65910_i2c_write(tps65910, reg, 1, &data); - if (err) - dev_err(tps65910->dev, "write to reg %x failed\n", reg); - -out: - mutex_unlock(&tps65910->io_mutex); - return err; + return regmap_update_bits(tps65910->regmap, reg, mask, 0); } EXPORT_SYMBOL_GPL(tps65910_clear_bits); +static bool is_volatile_reg(struct device *dev, unsigned int reg) +{ + struct tps65910 *tps65910 = dev_get_drvdata(dev); + + /* + * Caching all regulator registers. + * All regualator register address range is same for + * TPS65910 and TPS65911 + */ + if ((reg >= TPS65910_VIO) && (reg <= TPS65910_VDAC)) { + /* Check for non-existing register */ + if (tps65910_chip_id(tps65910) == TPS65910) + if ((reg == TPS65911_VDDCTRL_OP) || + (reg == TPS65911_VDDCTRL_SR)) + return true; + return false; + } + return true; +} + +static const struct regmap_config rc5t583_regmap_config = { + .reg_bits = 8, + .val_bits = 8, + .volatile_reg = is_volatile_reg, + .max_register = TPS65910_MAX_REGISTER, + .num_reg_defaults_raw = TPS65910_MAX_REGISTER, + .cache_type = REGCACHE_RBTREE, +}; + static int tps65910_i2c_probe(struct i2c_client *i2c, const struct i2c_device_id *id) { @@ -161,6 +120,13 @@ static int tps65910_i2c_probe(struct i2c_client *i2c, tps65910->write = tps65910_i2c_write; mutex_init(&tps65910->io_mutex); + tps65910->regmap = regmap_init_i2c(i2c, &rc5t583_regmap_config); + if (IS_ERR(tps65910->regmap)) { + ret = PTR_ERR(tps65910->regmap); + dev_err(&i2c->dev, "regmap initialization failed: %d\n", ret); + goto regmap_err; + } + ret = mfd_add_devices(tps65910->dev, -1, tps65910s, ARRAY_SIZE(tps65910s), NULL, 0); @@ -178,6 +144,8 @@ static int tps65910_i2c_probe(struct i2c_client *i2c, return ret; err: + regmap_exit(tps65910->regmap); +regmap_err: kfree(tps65910); kfree(init_data); return ret; @@ -189,6 +157,7 @@ static int tps65910_i2c_remove(struct i2c_client *i2c) tps65910_irq_exit(tps65910); mfd_remove_devices(tps65910->dev); + regmap_exit(tps65910->regmap); kfree(tps65910); return 0; diff --git a/include/linux/mfd/tps65910.h b/include/linux/mfd/tps65910.h index d0cb12eba402..b9aceb5c1221 100644 --- a/include/linux/mfd/tps65910.h +++ b/include/linux/mfd/tps65910.h @@ -789,6 +789,7 @@ struct tps65910_board { struct tps65910 { struct device *dev; struct i2c_client *i2c_client; + struct regmap *regmap; struct mutex io_mutex; unsigned int id; int (*read)(struct tps65910 *tps65910, u8 reg, int size, void *dest); -- 2.20.1