diff options
Diffstat (limited to 'drivers/i2c/i2c-core-base.c')
| -rw-r--r-- | drivers/i2c/i2c-core-base.c | 153 |
1 files changed, 114 insertions, 39 deletions
diff --git a/drivers/i2c/i2c-core-base.c b/drivers/i2c/i2c-core-base.c index 1f1442dfcad7..ac7edcc1d5ee 100644 --- a/drivers/i2c/i2c-core-base.c +++ b/drivers/i2c/i2c-core-base.c @@ -313,12 +313,14 @@ static int i2c_smbus_host_notify_to_irq(const struct i2c_client *client) static int i2c_device_probe(struct device *dev) { struct i2c_client *client = i2c_verify_client(dev); + struct i2c_adapter *adap; struct i2c_driver *driver; int status; if (!client) return 0; + adap = client->adapter; driver = to_i2c_driver(dev->driver); client->irq = client->init_irq; @@ -384,6 +386,12 @@ static int i2c_device_probe(struct device *dev) dev_dbg(dev, "probe\n"); + status = regulator_enable(adap->bus_regulator); + if (status < 0) { + dev_err(&adap->dev, "Failed to enable power regulator\n"); + goto err_clear_wakeup_irq; + } + status = of_clk_set_defaults(dev->of_node, false); if (status < 0) goto err_clear_wakeup_irq; @@ -424,12 +432,14 @@ put_sync_adapter: static int i2c_device_remove(struct device *dev) { struct i2c_client *client = i2c_verify_client(dev); + struct i2c_adapter *adap; struct i2c_driver *driver; int status = 0; if (!client || !dev->driver) return 0; + adap = client->adapter; driver = to_i2c_driver(dev->driver); if (driver->remove) { dev_dbg(dev, "remove\n"); @@ -437,6 +447,8 @@ static int i2c_device_remove(struct device *dev) } dev_pm_domain_detach(&client->dev, true); + if (!pm_runtime_status_suspended(&client->dev)) + regulator_disable(adap->bus_regulator); dev_pm_clear_wake_irq(&client->dev); device_init_wakeup(&client->dev, false); @@ -448,6 +460,72 @@ static int i2c_device_remove(struct device *dev) return status; } +#ifdef CONFIG_PM_SLEEP +static int i2c_resume_early(struct device *dev) +{ + struct i2c_client *client = i2c_verify_client(dev); + struct i2c_adapter *adap = client->adapter; + int err; + + if (!pm_runtime_status_suspended(&client->dev)) { + err = regulator_enable(adap->bus_regulator); + if (err) + return err; + } + + return pm_generic_resume_early(&client->dev); +} + +static int i2c_suspend_late(struct device *dev) +{ + struct i2c_client *client = i2c_verify_client(dev); + struct i2c_adapter *adap = client->adapter; + int err; + + err = pm_generic_suspend_late(&client->dev); + if (err) + return err; + + if (!pm_runtime_status_suspended(&client->dev)) + return regulator_disable(adap->bus_regulator); + + return 0; +} +#endif + +#ifdef CONFIG_PM +static int i2c_runtime_resume(struct device *dev) +{ + struct i2c_client *client = i2c_verify_client(dev); + struct i2c_adapter *adap = client->adapter; + int err; + + err = regulator_enable(adap->bus_regulator); + if (err) + return err; + + return pm_generic_runtime_resume(&client->dev); +} + +static int i2c_runtime_suspend(struct device *dev) +{ + struct i2c_client *client = i2c_verify_client(dev); + struct i2c_adapter *adap = client->adapter; + int err; + + err = pm_generic_runtime_suspend(&client->dev); + if (err) + return err; + + return regulator_disable(adap->bus_regulator); +} +#endif + +static const struct dev_pm_ops i2c_device_pm = { + SET_LATE_SYSTEM_SLEEP_PM_OPS(i2c_suspend_late, i2c_resume_early) + SET_RUNTIME_PM_OPS(i2c_runtime_suspend, i2c_runtime_resume, NULL) +}; + static void i2c_device_shutdown(struct device *dev) { struct i2c_client *client = i2c_verify_client(dev); @@ -505,6 +583,7 @@ struct bus_type i2c_bus_type = { .probe = i2c_device_probe, .remove = i2c_device_remove, .shutdown = i2c_device_shutdown, + .pm = &i2c_device_pm, }; EXPORT_SYMBOL_GPL(i2c_bus_type); @@ -1343,6 +1422,11 @@ static int i2c_register_adapter(struct i2c_adapter *adap) if (res) goto out_reg; + adap->bus_regulator = devm_regulator_get(&adap->dev, "bus"); + if (IS_ERR(adap->bus_regulator)) { + res = PTR_ERR(adap->bus_regulator); + goto out_reg; + } dev_dbg(&adap->dev, "adapter [%s] registered\n", adap->name); pm_runtime_no_callbacks(&adap->dev); @@ -1598,6 +1682,18 @@ void i2c_del_adapter(struct i2c_adapter *adap) } EXPORT_SYMBOL(i2c_del_adapter); +static void i2c_parse_timing(struct device *dev, char *prop_name, u32 *cur_val_p, + u32 def_val, bool use_def) +{ + int ret; + + ret = device_property_read_u32(dev, prop_name, cur_val_p); + if (ret && use_def) + *cur_val_p = def_val; + + dev_dbg(dev, "%s: %u\n", prop_name, *cur_val_p); +} + /** * i2c_parse_fw_timings - get I2C related timing parameters from firmware * @dev: The device to scan for I2C timing properties @@ -1616,49 +1712,28 @@ EXPORT_SYMBOL(i2c_del_adapter); */ void i2c_parse_fw_timings(struct device *dev, struct i2c_timings *t, bool use_defaults) { - int ret; - - ret = device_property_read_u32(dev, "clock-frequency", &t->bus_freq_hz); - if (ret && use_defaults) - t->bus_freq_hz = I2C_MAX_STANDARD_MODE_FREQ; - - ret = device_property_read_u32(dev, "i2c-scl-rising-time-ns", &t->scl_rise_ns); - if (ret && use_defaults) { - if (t->bus_freq_hz <= I2C_MAX_STANDARD_MODE_FREQ) - t->scl_rise_ns = 1000; - else if (t->bus_freq_hz <= I2C_MAX_FAST_MODE_FREQ) - t->scl_rise_ns = 300; - else - t->scl_rise_ns = 120; - } - - ret = device_property_read_u32(dev, "i2c-scl-falling-time-ns", &t->scl_fall_ns); - if (ret && use_defaults) { - if (t->bus_freq_hz <= I2C_MAX_FAST_MODE_FREQ) - t->scl_fall_ns = 300; - else - t->scl_fall_ns = 120; - } - - ret = device_property_read_u32(dev, "i2c-scl-internal-delay-ns", &t->scl_int_delay_ns); - if (ret && use_defaults) - t->scl_int_delay_ns = 0; + bool u = use_defaults; + u32 d; - ret = device_property_read_u32(dev, "i2c-sda-falling-time-ns", &t->sda_fall_ns); - if (ret && use_defaults) - t->sda_fall_ns = t->scl_fall_ns; + i2c_parse_timing(dev, "clock-frequency", &t->bus_freq_hz, + I2C_MAX_STANDARD_MODE_FREQ, u); - ret = device_property_read_u32(dev, "i2c-sda-hold-time-ns", &t->sda_hold_ns); - if (ret && use_defaults) - t->sda_hold_ns = 0; + d = t->bus_freq_hz <= I2C_MAX_STANDARD_MODE_FREQ ? 1000 : + t->bus_freq_hz <= I2C_MAX_FAST_MODE_FREQ ? 300 : 120; + i2c_parse_timing(dev, "i2c-scl-rising-time-ns", &t->scl_rise_ns, d, u); - ret = device_property_read_u32(dev, "i2c-digital-filter-width-ns", &t->digital_filter_width_ns); - if (ret && use_defaults) - t->digital_filter_width_ns = 0; + d = t->bus_freq_hz <= I2C_MAX_FAST_MODE_FREQ ? 300 : 120; + i2c_parse_timing(dev, "i2c-scl-falling-time-ns", &t->scl_fall_ns, d, u); - ret = device_property_read_u32(dev, "i2c-analog-filter-cutoff-frequency", &t->analog_filter_cutoff_freq_hz); - if (ret && use_defaults) - t->analog_filter_cutoff_freq_hz = 0; + i2c_parse_timing(dev, "i2c-scl-internal-delay-ns", + &t->scl_int_delay_ns, 0, u); + i2c_parse_timing(dev, "i2c-sda-falling-time-ns", &t->sda_fall_ns, + t->scl_fall_ns, u); + i2c_parse_timing(dev, "i2c-sda-hold-time-ns", &t->sda_hold_ns, 0, u); + i2c_parse_timing(dev, "i2c-digital-filter-width-ns", + &t->digital_filter_width_ns, 0, u); + i2c_parse_timing(dev, "i2c-analog-filter-cutoff-frequency", + &t->analog_filter_cutoff_freq_hz, 0, u); } EXPORT_SYMBOL_GPL(i2c_parse_fw_timings); |