regulator: Add new driver for ST's PWM controlled voltage regulators (4a5d3013) · Commits · e / devices / android_kernel_fairphone_FP3

drivers/regulator/Kconfig

+6 −0

Original line number	Original line	Diff line number	Diff line
	@@ -432,6 +432,12 @@ config REGULATOR_S5M8767
	via I2C bus. S5M8767A have 9 Bucks and 28 LDOs output and		via I2C bus. S5M8767A have 9 Bucks and 28 LDOs output and
	supports DVS mode with 8bits of output voltage control.		supports DVS mode with 8bits of output voltage control.

			config REGULATOR_ST_PWM
			tristate "STMicroelectronics PWM voltage regulator"
			depends on ARCH_STI
			help
			This driver supports ST's PWM controlled voltage regulators.

	config REGULATOR_TI_ABB		config REGULATOR_TI_ABB
	tristate "TI Adaptive Body Bias on-chip LDO"		tristate "TI Adaptive Body Bias on-chip LDO"
	depends on ARCH_OMAP		depends on ARCH_OMAP

drivers/regulator/Makefile

+1 −0

Original line number	Original line	Diff line number	Diff line
	@@ -59,6 +59,7 @@ obj-$(CONFIG_REGULATOR_PCF50633) += pcf50633-regulator.o
	obj-$(CONFIG_REGULATOR_RC5T583) += rc5t583-regulator.o		obj-$(CONFIG_REGULATOR_RC5T583) += rc5t583-regulator.o
	obj-$(CONFIG_REGULATOR_S2MPS11) += s2mps11.o		obj-$(CONFIG_REGULATOR_S2MPS11) += s2mps11.o
	obj-$(CONFIG_REGULATOR_S5M8767) += s5m8767.o		obj-$(CONFIG_REGULATOR_S5M8767) += s5m8767.o
			obj-$(CONFIG_REGULATOR_ST_PWM) += st-pwm.o
	obj-$(CONFIG_REGULATOR_STW481X_VMMC) += stw481x-vmmc.o		obj-$(CONFIG_REGULATOR_STW481X_VMMC) += stw481x-vmmc.o
	obj-$(CONFIG_REGULATOR_TI_ABB) += ti-abb-regulator.o		obj-$(CONFIG_REGULATOR_TI_ABB) += ti-abb-regulator.o
	obj-$(CONFIG_REGULATOR_TPS6105X) += tps6105x-regulator.o		obj-$(CONFIG_REGULATOR_TPS6105X) += tps6105x-regulator.o

drivers/regulator/st-pwm.c

0 → 100644

+193 −0

Original line number	Original line	Diff line number	Diff line
			/*
			* Regulator driver for ST's 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>

			#define ST_PWM_REG_PERIOD 8448

			struct st_pwm_regulator_pdata {
			const struct regulator_desc *desc;
			struct st_pwm_voltages *duty_cycle_table;
			};

			struct st_pwm_regulator_data {
			const struct st_pwm_regulator_pdata *pdata;
			struct pwm_device *pwm;
			bool enabled;
			int state;
			};

			struct st_pwm_voltages {
			unsigned int uV;
			unsigned int dutycycle;
			};

			static int st_pwm_regulator_get_voltage(struct regulator_dev *dev)
			{
			struct st_pwm_regulator_data *drvdata = rdev_get_drvdata(dev);

			return drvdata->pdata->duty_cycle_table[drvdata->state].uV;
			}

			static int st_pwm_regulator_set_voltage_sel(struct regulator_dev *dev,
			unsigned selector)
			{
			struct st_pwm_regulator_data *drvdata = rdev_get_drvdata(dev);
			int dutycycle;
			int ret;

			if (selector >= dev->desc->n_voltages)
			return -EINVAL;

			dutycycle = (ST_PWM_REG_PERIOD / 100) *
			drvdata->pdata->duty_cycle_table[selector].dutycycle;

			ret = pwm_config(drvdata->pwm, dutycycle, ST_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 st_pwm_regulator_list_voltage(struct regulator_dev *dev,
			unsigned selector)
			{
			struct st_pwm_regulator_data *drvdata = rdev_get_drvdata(dev);

			if (selector >= dev->desc->n_voltages)
			return -EINVAL;

			return drvdata->pdata->duty_cycle_table[selector].uV;
			}

			static struct regulator_ops st_pwm_regulator_voltage_ops = {
			.set_voltage_sel = st_pwm_regulator_set_voltage_sel,
			.get_voltage = st_pwm_regulator_get_voltage,
			.list_voltage = st_pwm_regulator_list_voltage,
			.map_voltage = regulator_map_voltage_iterate,
			};

			static struct st_pwm_voltages b2105_duty_cycle_table[] = {
			{ .uV = 1114000, .dutycycle = 0, },
			{ .uV = 1095000, .dutycycle = 10, },
			{ .uV = 1076000, .dutycycle = 20, },
			{ .uV = 1056000, .dutycycle = 30, },
			{ .uV = 1036000, .dutycycle = 40, },
			{ .uV = 1016000, .dutycycle = 50, },
			/* WARNING: Values above 50% duty-cycle cause boot failures. */
			};

			static const struct regulator_desc b2105_desc = {
			.name = "b2105-pwm-regulator",
			.ops = &st_pwm_regulator_voltage_ops,
			.type = REGULATOR_VOLTAGE,
			.owner = THIS_MODULE,
			.n_voltages = ARRAY_SIZE(b2105_duty_cycle_table),
			.supply_name = "pwm",
			};

			static const struct st_pwm_regulator_pdata b2105_info = {
			.desc = &b2105_desc,
			.duty_cycle_table = b2105_duty_cycle_table,
			};

			static struct of_device_id st_pwm_of_match[] = {
			{ .compatible = "st,b2105-pwm-regulator", .data = &b2105_info, },
			{ },
			};
			MODULE_DEVICE_TABLE(of, st_pwm_of_match);

			static int st_pwm_regulator_probe(struct platform_device *pdev)
			{
			struct st_pwm_regulator_data *drvdata;
			struct regulator_dev *regulator;
			struct regulator_config config = { };
			struct device_node *np = pdev->dev.of_node;
			const struct of_device_id *of_match;

			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;

			of_match = of_match_device(st_pwm_of_match, &pdev->dev);
			if (!of_match) {
			dev_err(&pdev->dev, "failed to match of device\n");
			return -ENODEV;
			}
			drvdata->pdata = of_match->data;

			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->pdata->desc, &config);
			if (IS_ERR(regulator)) {
			dev_err(&pdev->dev, "Failed to register regulator %s\n",
			drvdata->pdata->desc->name);
			return PTR_ERR(regulator);
			}

			return 0;
			}

			static struct platform_driver st_pwm_regulator_driver = {
			.driver = {
			.name = "st-pwm-regulator",
			.owner = THIS_MODULE,
			.of_match_table = of_match_ptr(st_pwm_of_match),
			},
			.probe = st_pwm_regulator_probe,
			};

			module_platform_driver(st_pwm_regulator_driver);

			MODULE_LICENSE("GPL");
			MODULE_AUTHOR("Lee Jones <lee.jones@linaro.org>");
			MODULE_DESCRIPTION("ST PWM Regulator Driver");
			MODULE_ALIAS("platform:st_pwm-regulator");