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regulator: pwm-regulator: get voltage and duty table from dts
rename st-pwm to pwm-regulator. And support getting voltage & duty table from device tree, other platforms can also use this driver without any modify. Signed-off-by: Chris Zhong <zyw@rock-chips.com> Reviewed-by: Doug Anderson <dianders@chromium.org> Tested-by: Doug Anderson <dianders@chromium.org> Signed-off-by: Mark Brown <broonie@kernel.org>
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Chris Zhong
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Mark Brown
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Sep 28, 2014
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,197 @@ | ||
| /* | ||
| * Regulator driver for PWM Regulators | ||
| * | ||
| * Copyright (C) 2014 - STMicroelectronics Inc. | ||
| * | ||
| * Author: Lee Jones <lee.jones@linaro.org> | ||
| * | ||
| * This program is free software; you can redistribute it and/or modify | ||
| * it under the terms of the GNU General Public License version 2 as | ||
| * published by the Free Software Foundation. | ||
| */ | ||
|
|
||
| #include <linux/module.h> | ||
| #include <linux/init.h> | ||
| #include <linux/err.h> | ||
| #include <linux/regulator/driver.h> | ||
| #include <linux/regulator/machine.h> | ||
| #include <linux/regulator/of_regulator.h> | ||
| #include <linux/of.h> | ||
| #include <linux/of_device.h> | ||
| #include <linux/pwm.h> | ||
|
|
||
| struct pwm_regulator_data { | ||
| struct regulator_desc desc; | ||
| struct pwm_voltages *duty_cycle_table; | ||
| struct pwm_device *pwm; | ||
| bool enabled; | ||
| int state; | ||
| }; | ||
|
|
||
| struct pwm_voltages { | ||
| unsigned int uV; | ||
| unsigned int dutycycle; | ||
| }; | ||
|
|
||
| static int pwm_regulator_get_voltage_sel(struct regulator_dev *dev) | ||
| { | ||
| struct pwm_regulator_data *drvdata = rdev_get_drvdata(dev); | ||
|
|
||
| return drvdata->state; | ||
| } | ||
|
|
||
| static int pwm_regulator_set_voltage_sel(struct regulator_dev *dev, | ||
| unsigned selector) | ||
| { | ||
| struct pwm_regulator_data *drvdata = rdev_get_drvdata(dev); | ||
| unsigned int pwm_reg_period; | ||
| int dutycycle; | ||
| int ret; | ||
|
|
||
| pwm_reg_period = pwm_get_period(drvdata->pwm); | ||
|
|
||
| dutycycle = (pwm_reg_period * | ||
| drvdata->duty_cycle_table[selector].dutycycle) / 100; | ||
|
|
||
| ret = pwm_config(drvdata->pwm, dutycycle, pwm_reg_period); | ||
| if (ret) { | ||
| dev_err(&dev->dev, "Failed to configure PWM\n"); | ||
| return ret; | ||
| } | ||
|
|
||
| drvdata->state = selector; | ||
|
|
||
| if (!drvdata->enabled) { | ||
| ret = pwm_enable(drvdata->pwm); | ||
| if (ret) { | ||
| dev_err(&dev->dev, "Failed to enable PWM\n"); | ||
| return ret; | ||
| } | ||
| drvdata->enabled = true; | ||
| } | ||
|
|
||
| return 0; | ||
| } | ||
|
|
||
| static int pwm_regulator_list_voltage(struct regulator_dev *dev, | ||
| unsigned selector) | ||
| { | ||
| struct pwm_regulator_data *drvdata = rdev_get_drvdata(dev); | ||
|
|
||
| if (selector >= drvdata->desc.n_voltages) | ||
| return -EINVAL; | ||
|
|
||
| return drvdata->duty_cycle_table[selector].uV; | ||
| } | ||
|
|
||
| static struct regulator_ops pwm_regulator_voltage_ops = { | ||
| .set_voltage_sel = pwm_regulator_set_voltage_sel, | ||
| .get_voltage_sel = pwm_regulator_get_voltage_sel, | ||
| .list_voltage = pwm_regulator_list_voltage, | ||
| .map_voltage = regulator_map_voltage_iterate, | ||
| }; | ||
|
|
||
| static const struct regulator_desc pwm_regulator_desc = { | ||
| .name = "pwm-regulator", | ||
| .ops = &pwm_regulator_voltage_ops, | ||
| .type = REGULATOR_VOLTAGE, | ||
| .owner = THIS_MODULE, | ||
| .supply_name = "pwm", | ||
| }; | ||
|
|
||
| static int pwm_regulator_probe(struct platform_device *pdev) | ||
| { | ||
| struct pwm_regulator_data *drvdata; | ||
| struct property *prop; | ||
| struct regulator_dev *regulator; | ||
| struct regulator_config config = { }; | ||
| struct device_node *np = pdev->dev.of_node; | ||
| int length, ret; | ||
|
|
||
| if (!np) { | ||
| dev_err(&pdev->dev, "Device Tree node missing\n"); | ||
| return -EINVAL; | ||
| } | ||
|
|
||
| drvdata = devm_kzalloc(&pdev->dev, sizeof(*drvdata), GFP_KERNEL); | ||
| if (!drvdata) | ||
| return -ENOMEM; | ||
|
|
||
| memcpy(&drvdata->desc, &pwm_regulator_desc, sizeof(pwm_regulator_desc)); | ||
|
|
||
| /* determine the number of voltage-table */ | ||
| prop = of_find_property(np, "voltage-table", &length); | ||
| if (!prop) { | ||
| dev_err(&pdev->dev, "No voltage-table\n"); | ||
| return -EINVAL; | ||
| } | ||
|
|
||
| if ((length < sizeof(*drvdata->duty_cycle_table)) || | ||
| (length % sizeof(*drvdata->duty_cycle_table))) { | ||
| dev_err(&pdev->dev, "voltage-table length(%d) is invalid\n", | ||
| length); | ||
| return -EINVAL; | ||
| } | ||
|
|
||
| drvdata->desc.n_voltages = length / sizeof(*drvdata->duty_cycle_table); | ||
|
|
||
| drvdata->duty_cycle_table = devm_kzalloc(&pdev->dev, | ||
| length, GFP_KERNEL); | ||
| if (!drvdata->duty_cycle_table) | ||
| return -ENOMEM; | ||
|
|
||
| /* read voltage table from DT property */ | ||
| ret = of_property_read_u32_array(np, "voltage-table", | ||
| (u32 *)drvdata->duty_cycle_table, | ||
| length / sizeof(u32)); | ||
| if (ret < 0) { | ||
| dev_err(&pdev->dev, "read voltage-table failed\n"); | ||
| return ret; | ||
| } | ||
|
|
||
| config.init_data = of_get_regulator_init_data(&pdev->dev, np); | ||
| if (!config.init_data) | ||
| return -ENOMEM; | ||
|
|
||
| config.of_node = np; | ||
| config.dev = &pdev->dev; | ||
| config.driver_data = drvdata; | ||
|
|
||
| drvdata->pwm = devm_pwm_get(&pdev->dev, NULL); | ||
| if (IS_ERR(drvdata->pwm)) { | ||
| dev_err(&pdev->dev, "Failed to get PWM\n"); | ||
| return PTR_ERR(drvdata->pwm); | ||
| } | ||
|
|
||
| regulator = devm_regulator_register(&pdev->dev, | ||
| &drvdata->desc, &config); | ||
| if (IS_ERR(regulator)) { | ||
| dev_err(&pdev->dev, "Failed to register regulator %s\n", | ||
| drvdata->desc.name); | ||
| return PTR_ERR(regulator); | ||
| } | ||
|
|
||
| return 0; | ||
| } | ||
|
|
||
| static const struct of_device_id pwm_of_match[] = { | ||
| { .compatible = "pwm-regulator" }, | ||
| { }, | ||
| }; | ||
| MODULE_DEVICE_TABLE(of, pwm_of_match); | ||
|
|
||
| static struct platform_driver pwm_regulator_driver = { | ||
| .driver = { | ||
| .name = "pwm-regulator", | ||
| .owner = THIS_MODULE, | ||
| .of_match_table = of_match_ptr(pwm_of_match), | ||
| }, | ||
| .probe = pwm_regulator_probe, | ||
| }; | ||
|
|
||
| module_platform_driver(pwm_regulator_driver); | ||
|
|
||
| MODULE_LICENSE("GPL"); | ||
| MODULE_AUTHOR("Lee Jones <lee.jones@linaro.org>"); | ||
| MODULE_DESCRIPTION("PWM Regulator Driver"); | ||
| MODULE_ALIAS("platform:pwm-regulator"); |
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