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![Axel Lin](/assets/img/avatar_default.png)
devm_gpiod_get_array_optional may return NULL if no GPIO was assigned. Signed-off-by: Axel Lin <axel.lin@ingics.com> Link: https://lore.kernel.org/r/20210603094944.1114156-1-axel.lin@ingics.com Signed-off-by: Mark Brown <broonie@kernel.org>
223 lines
5.3 KiB
C
223 lines
5.3 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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#include <linux/gpio/consumer.h>
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#include <linux/i2c.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/regmap.h>
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#include <linux/regulator/driver.h>
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#define RT4801_REG_VOP 0x00
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#define RT4801_REG_VON 0x01
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#define RT4801_REG_APPS 0x03
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#define VOUT_MASK 0x1F
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#define MIN_UV 4000000
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#define STEP_UV 100000
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#define MAX_UV 6000000
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#define N_VOLTAGES ((MAX_UV - MIN_UV) / STEP_UV + 1)
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#define DSV_OUT_POS 0
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#define DSV_OUT_NEG 1
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#define DSV_OUT_MAX 2
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#define DSVP_ENABLE BIT(0)
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#define DSVN_ENABLE BIT(1)
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#define DSVALL_ENABLE (DSVP_ENABLE | DSVN_ENABLE)
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struct rt4801_priv {
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struct device *dev;
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struct gpio_descs *enable_gpios;
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unsigned int enable_flag;
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unsigned int volt_sel[DSV_OUT_MAX];
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};
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static int rt4801_set_voltage_sel(struct regulator_dev *rdev, unsigned int selector)
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{
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struct rt4801_priv *priv = rdev_get_drvdata(rdev);
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int id = rdev_get_id(rdev), ret;
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if (priv->enable_flag & BIT(id)) {
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ret = regulator_set_voltage_sel_regmap(rdev, selector);
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if (ret)
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return ret;
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}
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priv->volt_sel[id] = selector;
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return 0;
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}
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static int rt4801_get_voltage_sel(struct regulator_dev *rdev)
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{
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struct rt4801_priv *priv = rdev_get_drvdata(rdev);
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int id = rdev_get_id(rdev);
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if (priv->enable_flag & BIT(id))
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return regulator_get_voltage_sel_regmap(rdev);
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return priv->volt_sel[id];
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}
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static int rt4801_enable(struct regulator_dev *rdev)
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{
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struct rt4801_priv *priv = rdev_get_drvdata(rdev);
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struct gpio_descs *gpios = priv->enable_gpios;
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int id = rdev_get_id(rdev), ret;
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if (!gpios || gpios->ndescs <= id) {
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dev_warn(&rdev->dev, "no dedicated gpio can control\n");
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goto bypass_gpio;
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}
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gpiod_set_value(gpios->desc[id], 1);
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bypass_gpio:
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ret = regmap_write(rdev->regmap, rdev->desc->vsel_reg, priv->volt_sel[id]);
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if (ret)
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return ret;
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priv->enable_flag |= BIT(id);
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return 0;
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}
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static int rt4801_disable(struct regulator_dev *rdev)
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{
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struct rt4801_priv *priv = rdev_get_drvdata(rdev);
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struct gpio_descs *gpios = priv->enable_gpios;
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int id = rdev_get_id(rdev);
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if (!gpios || gpios->ndescs <= id) {
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dev_warn(&rdev->dev, "no dedicated gpio can control\n");
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goto bypass_gpio;
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}
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gpiod_set_value(gpios->desc[id], 0);
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bypass_gpio:
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priv->enable_flag &= ~BIT(id);
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return 0;
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}
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static int rt4801_is_enabled(struct regulator_dev *rdev)
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{
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struct rt4801_priv *priv = rdev_get_drvdata(rdev);
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int id = rdev_get_id(rdev);
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return !!(priv->enable_flag & BIT(id));
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}
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static const struct regulator_ops rt4801_regulator_ops = {
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.list_voltage = regulator_list_voltage_linear,
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.set_voltage_sel = rt4801_set_voltage_sel,
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.get_voltage_sel = rt4801_get_voltage_sel,
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.enable = rt4801_enable,
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.disable = rt4801_disable,
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.is_enabled = rt4801_is_enabled,
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};
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static const struct regulator_desc rt4801_regulator_descs[] = {
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{
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.name = "DSVP",
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.ops = &rt4801_regulator_ops,
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.of_match = of_match_ptr("DSVP"),
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.type = REGULATOR_VOLTAGE,
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.id = DSV_OUT_POS,
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.min_uV = MIN_UV,
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.uV_step = STEP_UV,
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.n_voltages = N_VOLTAGES,
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.owner = THIS_MODULE,
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.vsel_reg = RT4801_REG_VOP,
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.vsel_mask = VOUT_MASK,
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},
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{
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.name = "DSVN",
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.ops = &rt4801_regulator_ops,
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.of_match = of_match_ptr("DSVN"),
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.type = REGULATOR_VOLTAGE,
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.id = DSV_OUT_NEG,
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.min_uV = MIN_UV,
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.uV_step = STEP_UV,
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.n_voltages = N_VOLTAGES,
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.owner = THIS_MODULE,
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.vsel_reg = RT4801_REG_VON,
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.vsel_mask = VOUT_MASK,
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},
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};
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static const struct regmap_config rt4801_regmap_config = {
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.reg_bits = 8,
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.val_bits = 8,
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.max_register = RT4801_REG_APPS,
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};
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static int rt4801_probe(struct i2c_client *i2c)
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{
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struct rt4801_priv *priv;
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struct regmap *regmap;
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int i;
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priv = devm_kzalloc(&i2c->dev, sizeof(*priv), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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priv->dev = &i2c->dev;
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/* bootloader will on, driver only reconfigure enable to all output high */
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priv->enable_flag = DSVALL_ENABLE;
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regmap = devm_regmap_init_i2c(i2c, &rt4801_regmap_config);
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if (IS_ERR(regmap)) {
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dev_err(&i2c->dev, "Failed to init regmap\n");
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return PTR_ERR(regmap);
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}
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priv->enable_gpios = devm_gpiod_get_array_optional(&i2c->dev, "enable", GPIOD_OUT_HIGH);
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if (IS_ERR(priv->enable_gpios)) {
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dev_err(&i2c->dev, "Failed to get gpios\n");
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return PTR_ERR(priv->enable_gpios);
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}
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for (i = 0; i < DSV_OUT_MAX; i++) {
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const struct regulator_desc *desc = rt4801_regulator_descs + i;
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struct regulator_config config = { .dev = &i2c->dev, .driver_data = priv,
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.regmap = regmap, };
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struct regulator_dev *rdev;
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unsigned int val;
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int ret;
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/* initialize volt_sel variable */
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ret = regmap_read(regmap, desc->vsel_reg, &val);
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if (ret)
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return ret;
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priv->volt_sel[i] = val & desc->vsel_mask;
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rdev = devm_regulator_register(&i2c->dev, desc, &config);
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if (IS_ERR(rdev)) {
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dev_err(&i2c->dev, "Failed to register [%d] regulator\n", i);
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return PTR_ERR(rdev);
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}
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}
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return 0;
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}
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static const struct of_device_id __maybe_unused rt4801_of_id[] = {
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{ .compatible = "richtek,rt4801", },
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{ },
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};
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MODULE_DEVICE_TABLE(of, rt4801_of_id);
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static struct i2c_driver rt4801_driver = {
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.driver = {
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.name = "rt4801",
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.of_match_table = of_match_ptr(rt4801_of_id),
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},
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.probe_new = rt4801_probe,
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};
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module_i2c_driver(rt4801_driver);
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MODULE_AUTHOR("ChiYuan Hwang <cy_huang@richtek.com>");
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MODULE_DESCRIPTION("Richtek RT4801 Display Bias Driver");
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MODULE_LICENSE("GPL v2");
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