256 lines
6.7 KiB
C
256 lines
6.7 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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#include <linux/bitops.h>
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#include <linux/delay.h>
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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/regmap.h>
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#include <linux/regulator/driver.h>
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#include <linux/regulator/of_regulator.h>
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#define RT6245_VIRT_OCLIMIT 0x00
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#define RT6245_VIRT_OTLEVEL 0x01
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#define RT6245_VIRT_PGDLYTIME 0x02
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#define RT6245_VIRT_SLEWRATE 0x03
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#define RT6245_VIRT_SWFREQ 0x04
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#define RT6245_VIRT_VOUT 0x05
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#define RT6245_VOUT_MASK GENMASK(6, 0)
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#define RT6245_SLEW_MASK GENMASK(2, 0)
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#define RT6245_CHKSUM_MASK BIT(7)
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#define RT6245_CODE_MASK GENMASK(6, 0)
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/* HW Enable + Soft start time */
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#define RT6245_ENTIME_IN_US 5000
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#define RT6245_VOUT_MINUV 437500
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#define RT6245_VOUT_MAXUV 1387500
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#define RT6245_VOUT_STEPUV 12500
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#define RT6245_NUM_VOUT ((RT6245_VOUT_MAXUV - RT6245_VOUT_MINUV) / RT6245_VOUT_STEPUV + 1)
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struct rt6245_priv {
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struct gpio_desc *enable_gpio;
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bool enable_state;
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};
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static int rt6245_enable(struct regulator_dev *rdev)
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{
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struct rt6245_priv *priv = rdev_get_drvdata(rdev);
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struct regmap *regmap = rdev_get_regmap(rdev);
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int ret;
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if (!priv->enable_gpio)
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return 0;
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gpiod_direction_output(priv->enable_gpio, 1);
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usleep_range(RT6245_ENTIME_IN_US, RT6245_ENTIME_IN_US + 1000);
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regcache_cache_only(regmap, false);
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ret = regcache_sync(regmap);
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if (ret)
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return ret;
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priv->enable_state = true;
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return 0;
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}
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static int rt6245_disable(struct regulator_dev *rdev)
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{
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struct rt6245_priv *priv = rdev_get_drvdata(rdev);
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struct regmap *regmap = rdev_get_regmap(rdev);
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if (!priv->enable_gpio)
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return -EINVAL;
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regcache_cache_only(regmap, true);
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regcache_mark_dirty(regmap);
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gpiod_direction_output(priv->enable_gpio, 0);
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priv->enable_state = false;
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return 0;
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}
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static int rt6245_is_enabled(struct regulator_dev *rdev)
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{
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struct rt6245_priv *priv = rdev_get_drvdata(rdev);
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return priv->enable_state ? 1 : 0;
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}
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static const struct regulator_ops rt6245_regulator_ops = {
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.list_voltage = regulator_list_voltage_linear,
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.set_voltage_sel = regulator_set_voltage_sel_regmap,
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.get_voltage_sel = regulator_get_voltage_sel_regmap,
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.set_ramp_delay = regulator_set_ramp_delay_regmap,
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.enable = rt6245_enable,
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.disable = rt6245_disable,
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.is_enabled = rt6245_is_enabled,
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};
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/* ramp delay dividend is 12500 uV/uS, and divisor from 1 to 8 */
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static const unsigned int rt6245_ramp_delay_table[] = {
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12500, 6250, 4167, 3125, 2500, 2083, 1786, 1562
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};
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static const struct regulator_desc rt6245_regulator_desc = {
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.name = "rt6245-regulator",
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.ops = &rt6245_regulator_ops,
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.type = REGULATOR_VOLTAGE,
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.min_uV = RT6245_VOUT_MINUV,
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.uV_step = RT6245_VOUT_STEPUV,
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.n_voltages = RT6245_NUM_VOUT,
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.ramp_delay_table = rt6245_ramp_delay_table,
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.n_ramp_values = ARRAY_SIZE(rt6245_ramp_delay_table),
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.owner = THIS_MODULE,
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.vsel_reg = RT6245_VIRT_VOUT,
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.vsel_mask = RT6245_VOUT_MASK,
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.ramp_reg = RT6245_VIRT_SLEWRATE,
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.ramp_mask = RT6245_SLEW_MASK,
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};
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static int rt6245_init_device_properties(struct device *dev)
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{
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const struct {
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const char *name;
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unsigned int reg;
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} rt6245_props[] = {
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{ "richtek,oc-level-select", RT6245_VIRT_OCLIMIT },
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{ "richtek,ot-level-select", RT6245_VIRT_OTLEVEL },
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{ "richtek,pgdly-time-select", RT6245_VIRT_PGDLYTIME },
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{ "richtek,switch-freq-select", RT6245_VIRT_SWFREQ }
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};
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struct regmap *regmap = dev_get_regmap(dev, NULL);
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u8 propval;
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int i, ret;
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for (i = 0; i < ARRAY_SIZE(rt6245_props); i++) {
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ret = device_property_read_u8(dev, rt6245_props[i].name, &propval);
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if (ret)
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continue;
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ret = regmap_write(regmap, rt6245_props[i].reg, propval);
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if (ret) {
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dev_err(dev, "Fail to apply [%s:%d]\n", rt6245_props[i].name, propval);
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return ret;
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}
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}
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return 0;
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}
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static int rt6245_reg_write(void *context, unsigned int reg, unsigned int val)
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{
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struct i2c_client *i2c = context;
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static const u8 func_base[] = { 0x6F, 0x73, 0x78, 0x61, 0x7C, 0 };
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unsigned int code, bit_count;
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code = func_base[reg];
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code += val;
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/* xor checksum for bit 6 to 0 */
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bit_count = hweight8(code & RT6245_CODE_MASK);
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if (bit_count % 2)
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code |= RT6245_CHKSUM_MASK;
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else
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code &= ~RT6245_CHKSUM_MASK;
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return i2c_smbus_write_byte(i2c, code);
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}
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static const struct reg_default rt6245_reg_defaults[] = {
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/* Default over current 14A */
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{ RT6245_VIRT_OCLIMIT, 2 },
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/* Default over temperature 150'c */
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{ RT6245_VIRT_OTLEVEL, 0 },
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/* Default power good delay time 10us */
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{ RT6245_VIRT_PGDLYTIME, 1 },
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/* Default slewrate 12.5mV/uS */
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{ RT6245_VIRT_SLEWRATE, 0 },
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/* Default switch frequency 800KHz */
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{ RT6245_VIRT_SWFREQ, 1 },
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/* Default voltage 750mV */
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{ RT6245_VIRT_VOUT, 0x19 }
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};
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static const struct regmap_config rt6245_regmap_config = {
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.reg_bits = 8,
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.val_bits = 8,
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.max_register = RT6245_VIRT_VOUT,
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.cache_type = REGCACHE_FLAT,
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.reg_defaults = rt6245_reg_defaults,
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.num_reg_defaults = ARRAY_SIZE(rt6245_reg_defaults),
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.reg_write = rt6245_reg_write,
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};
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static int rt6245_probe(struct i2c_client *i2c)
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{
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struct rt6245_priv *priv;
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struct regmap *regmap;
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struct regulator_config regulator_cfg = {};
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struct regulator_dev *rdev;
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int ret;
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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->enable_state = true;
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priv->enable_gpio = devm_gpiod_get_optional(&i2c->dev, "enable", GPIOD_OUT_HIGH);
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if (IS_ERR(priv->enable_gpio)) {
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dev_err(&i2c->dev, "Failed to get 'enable' gpio\n");
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return PTR_ERR(priv->enable_gpio);
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}
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usleep_range(RT6245_ENTIME_IN_US, RT6245_ENTIME_IN_US + 1000);
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regmap = devm_regmap_init(&i2c->dev, NULL, i2c, &rt6245_regmap_config);
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if (IS_ERR(regmap)) {
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dev_err(&i2c->dev, "Failed to initialize the regmap\n");
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return PTR_ERR(regmap);
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}
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ret = rt6245_init_device_properties(&i2c->dev);
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if (ret) {
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dev_err(&i2c->dev, "Failed to initialize device properties\n");
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return ret;
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}
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regulator_cfg.dev = &i2c->dev;
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regulator_cfg.of_node = i2c->dev.of_node;
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regulator_cfg.regmap = regmap;
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regulator_cfg.driver_data = priv;
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regulator_cfg.init_data = of_get_regulator_init_data(&i2c->dev, i2c->dev.of_node,
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&rt6245_regulator_desc);
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rdev = devm_regulator_register(&i2c->dev, &rt6245_regulator_desc, ®ulator_cfg);
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if (IS_ERR(rdev)) {
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dev_err(&i2c->dev, "Failed to register regulator\n");
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return PTR_ERR(rdev);
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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 rt6245_of_match_table[] = {
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{ .compatible = "richtek,rt6245", },
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{}
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};
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MODULE_DEVICE_TABLE(of, rt6245_of_match_table);
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static struct i2c_driver rt6245_driver = {
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.driver = {
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.name = "rt6245",
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.probe_type = PROBE_PREFER_ASYNCHRONOUS,
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.of_match_table = rt6245_of_match_table,
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},
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.probe = rt6245_probe,
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};
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module_i2c_driver(rt6245_driver);
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MODULE_AUTHOR("ChiYuan Huang <cy_huang@richtek.com>");
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MODULE_DESCRIPTION("Richtek RT6245 Regulator Driver");
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MODULE_LICENSE("GPL v2");
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