| 1 | // SPDX-License-Identifier: GPL-2.0-only |
| 2 | |
| 3 | #include <linux/delay.h> |
| 4 | #include <linux/gpio/consumer.h> |
| 5 | #include <linux/i2c.h> |
| 6 | #include <linux/kernel.h> |
| 7 | #include <linux/module.h> |
| 8 | #include <linux/property.h> |
| 9 | #include <linux/regmap.h> |
| 10 | #include <linux/regulator/driver.h> |
| 11 | #include <linux/regulator/of_regulator.h> |
| 12 | |
| 13 | #define RT6160_MODE_AUTO 0 |
| 14 | #define RT6160_MODE_FPWM 1 |
| 15 | |
| 16 | #define RT6160_REG_CNTL 0x01 |
| 17 | #define RT6160_REG_STATUS 0x02 |
| 18 | #define RT6160_REG_DEVID 0x03 |
| 19 | #define RT6160_REG_VSELL 0x04 |
| 20 | #define RT6160_REG_VSELH 0x05 |
| 21 | #define RT6160_NUM_REGS (RT6160_REG_VSELH + 1) |
| 22 | |
| 23 | #define RT6160_FPWM_MASK BIT(3) |
| 24 | #define RT6160_RAMPRATE_MASK GENMASK(1, 0) |
| 25 | #define RT6160_VID_MASK GENMASK(7, 4) |
| 26 | #define RT6160_VSEL_MASK GENMASK(6, 0) |
| 27 | #define RT6160_HDSTAT_MASK BIT(4) |
| 28 | #define RT6160_UVSTAT_MASK BIT(3) |
| 29 | #define RT6160_OCSTAT_MASK BIT(2) |
| 30 | #define RT6160_TSDSTAT_MASK BIT(1) |
| 31 | #define RT6160_PGSTAT_MASK BIT(0) |
| 32 | |
| 33 | #define RT6160_VENDOR_ID 0xA0 |
| 34 | #define RT6160_VOUT_MINUV 2025000 |
| 35 | #define RT6160_VOUT_MAXUV 5200000 |
| 36 | #define RT6160_VOUT_STPUV 25000 |
| 37 | #define RT6160_N_VOUTS ((RT6160_VOUT_MAXUV - RT6160_VOUT_MINUV) / RT6160_VOUT_STPUV + 1) |
| 38 | |
| 39 | #define RT6160_I2CRDY_TIMEUS 100 |
| 40 | |
| 41 | struct rt6160_priv { |
| 42 | struct regulator_desc desc; |
| 43 | struct gpio_desc *enable_gpio; |
| 44 | struct regmap *regmap; |
| 45 | bool enable_state; |
| 46 | }; |
| 47 | |
| 48 | static const unsigned int rt6160_ramp_tables[] = { |
| 49 | 1000, 2500, 5000, 10000 |
| 50 | }; |
| 51 | |
| 52 | static int rt6160_enable(struct regulator_dev *rdev) |
| 53 | { |
| 54 | struct rt6160_priv *priv = rdev_get_drvdata(rdev); |
| 55 | |
| 56 | if (!priv->enable_gpio) |
| 57 | return 0; |
| 58 | |
| 59 | gpiod_set_value_cansleep(priv->enable_gpio, 1); |
| 60 | priv->enable_state = true; |
| 61 | |
| 62 | usleep_range(RT6160_I2CRDY_TIMEUS, RT6160_I2CRDY_TIMEUS + 100); |
| 63 | |
| 64 | regcache_cache_only(priv->regmap, false); |
| 65 | return regcache_sync(priv->regmap); |
| 66 | } |
| 67 | |
| 68 | static int rt6160_disable(struct regulator_dev *rdev) |
| 69 | { |
| 70 | struct rt6160_priv *priv = rdev_get_drvdata(rdev); |
| 71 | |
| 72 | if (!priv->enable_gpio) |
| 73 | return -EINVAL; |
| 74 | |
| 75 | /* Mark regcache as dirty and cache only before HW disabled */ |
| 76 | regcache_cache_only(priv->regmap, true); |
| 77 | regcache_mark_dirty(priv->regmap); |
| 78 | |
| 79 | priv->enable_state = false; |
| 80 | gpiod_set_value_cansleep(priv->enable_gpio, 0); |
| 81 | |
| 82 | return 0; |
| 83 | } |
| 84 | |
| 85 | static int rt6160_is_enabled(struct regulator_dev *rdev) |
| 86 | { |
| 87 | struct rt6160_priv *priv = rdev_get_drvdata(rdev); |
| 88 | |
| 89 | return priv->enable_state ? 1 : 0; |
| 90 | } |
| 91 | |
| 92 | static int rt6160_set_mode(struct regulator_dev *rdev, unsigned int mode) |
| 93 | { |
| 94 | struct regmap *regmap = rdev_get_regmap(rdev); |
| 95 | unsigned int mode_val; |
| 96 | |
| 97 | switch (mode) { |
| 98 | case REGULATOR_MODE_FAST: |
| 99 | mode_val = RT6160_FPWM_MASK; |
| 100 | break; |
| 101 | case REGULATOR_MODE_NORMAL: |
| 102 | mode_val = 0; |
| 103 | break; |
| 104 | default: |
| 105 | dev_err(&rdev->dev, "mode not supported\n"); |
| 106 | return -EINVAL; |
| 107 | } |
| 108 | |
| 109 | return regmap_update_bits(regmap, RT6160_REG_CNTL, RT6160_FPWM_MASK, mode_val); |
| 110 | } |
| 111 | |
| 112 | static unsigned int rt6160_get_mode(struct regulator_dev *rdev) |
| 113 | { |
| 114 | struct regmap *regmap = rdev_get_regmap(rdev); |
| 115 | unsigned int val; |
| 116 | int ret; |
| 117 | |
| 118 | ret = regmap_read(regmap, RT6160_REG_CNTL, &val); |
| 119 | if (ret) |
| 120 | return ret; |
| 121 | |
| 122 | if (val & RT6160_FPWM_MASK) |
| 123 | return REGULATOR_MODE_FAST; |
| 124 | |
| 125 | return REGULATOR_MODE_NORMAL; |
| 126 | } |
| 127 | |
| 128 | static int rt6160_set_suspend_voltage(struct regulator_dev *rdev, int uV) |
| 129 | { |
| 130 | struct regmap *regmap = rdev_get_regmap(rdev); |
| 131 | unsigned int suspend_vsel_reg; |
| 132 | int vsel; |
| 133 | |
| 134 | vsel = regulator_map_voltage_linear(rdev, uV, uV); |
| 135 | if (vsel < 0) |
| 136 | return vsel; |
| 137 | |
| 138 | if (rdev->desc->vsel_reg == RT6160_REG_VSELL) |
| 139 | suspend_vsel_reg = RT6160_REG_VSELH; |
| 140 | else |
| 141 | suspend_vsel_reg = RT6160_REG_VSELL; |
| 142 | |
| 143 | return regmap_update_bits(regmap, suspend_vsel_reg, |
| 144 | RT6160_VSEL_MASK, vsel); |
| 145 | } |
| 146 | |
| 147 | static int rt6160_get_error_flags(struct regulator_dev *rdev, unsigned int *flags) |
| 148 | { |
| 149 | struct regmap *regmap = rdev_get_regmap(rdev); |
| 150 | unsigned int val, events = 0; |
| 151 | int ret; |
| 152 | |
| 153 | ret = regmap_read(regmap, RT6160_REG_STATUS, &val); |
| 154 | if (ret) |
| 155 | return ret; |
| 156 | |
| 157 | if (val & (RT6160_HDSTAT_MASK | RT6160_TSDSTAT_MASK)) |
| 158 | events |= REGULATOR_ERROR_OVER_TEMP; |
| 159 | |
| 160 | if (val & RT6160_UVSTAT_MASK) |
| 161 | events |= REGULATOR_ERROR_UNDER_VOLTAGE; |
| 162 | |
| 163 | if (val & RT6160_OCSTAT_MASK) |
| 164 | events |= REGULATOR_ERROR_OVER_CURRENT; |
| 165 | |
| 166 | if (val & RT6160_PGSTAT_MASK) |
| 167 | events |= REGULATOR_ERROR_FAIL; |
| 168 | |
| 169 | *flags = events; |
| 170 | return 0; |
| 171 | } |
| 172 | |
| 173 | static const struct regulator_ops rt6160_regulator_ops = { |
| 174 | .list_voltage = regulator_list_voltage_linear, |
| 175 | .set_voltage_sel = regulator_set_voltage_sel_regmap, |
| 176 | .get_voltage_sel = regulator_get_voltage_sel_regmap, |
| 177 | |
| 178 | .enable = rt6160_enable, |
| 179 | .disable = rt6160_disable, |
| 180 | .is_enabled = rt6160_is_enabled, |
| 181 | |
| 182 | .set_mode = rt6160_set_mode, |
| 183 | .get_mode = rt6160_get_mode, |
| 184 | .set_suspend_voltage = rt6160_set_suspend_voltage, |
| 185 | .set_ramp_delay = regulator_set_ramp_delay_regmap, |
| 186 | .get_error_flags = rt6160_get_error_flags, |
| 187 | }; |
| 188 | |
| 189 | static unsigned int rt6160_of_map_mode(unsigned int mode) |
| 190 | { |
| 191 | switch (mode) { |
| 192 | case RT6160_MODE_FPWM: |
| 193 | return REGULATOR_MODE_FAST; |
| 194 | case RT6160_MODE_AUTO: |
| 195 | return REGULATOR_MODE_NORMAL; |
| 196 | } |
| 197 | |
| 198 | return REGULATOR_MODE_INVALID; |
| 199 | } |
| 200 | |
| 201 | static bool rt6160_is_accessible_reg(struct device *dev, unsigned int reg) |
| 202 | { |
| 203 | if (reg >= RT6160_REG_CNTL && reg <= RT6160_REG_VSELH) |
| 204 | return true; |
| 205 | return false; |
| 206 | } |
| 207 | |
| 208 | static bool rt6160_is_volatile_reg(struct device *dev, unsigned int reg) |
| 209 | { |
| 210 | if (reg == RT6160_REG_STATUS) |
| 211 | return true; |
| 212 | return false; |
| 213 | } |
| 214 | |
| 215 | static const struct regmap_config rt6160_regmap_config = { |
| 216 | .reg_bits = 8, |
| 217 | .val_bits = 8, |
| 218 | .max_register = RT6160_REG_VSELH, |
| 219 | .num_reg_defaults_raw = RT6160_NUM_REGS, |
| 220 | .cache_type = REGCACHE_FLAT, |
| 221 | |
| 222 | .writeable_reg = rt6160_is_accessible_reg, |
| 223 | .readable_reg = rt6160_is_accessible_reg, |
| 224 | .volatile_reg = rt6160_is_volatile_reg, |
| 225 | }; |
| 226 | |
| 227 | static int rt6160_probe(struct i2c_client *i2c) |
| 228 | { |
| 229 | struct rt6160_priv *priv; |
| 230 | struct regulator_config regulator_cfg = {}; |
| 231 | struct regulator_dev *rdev; |
| 232 | bool vsel_active_low; |
| 233 | unsigned int devid; |
| 234 | int ret; |
| 235 | |
| 236 | priv = devm_kzalloc(&i2c->dev, sizeof(*priv), GFP_KERNEL); |
| 237 | if (!priv) |
| 238 | return -ENOMEM; |
| 239 | |
| 240 | vsel_active_low = |
| 241 | device_property_present(&i2c->dev, "richtek,vsel-active-low"); |
| 242 | |
| 243 | priv->enable_gpio = devm_gpiod_get_optional(&i2c->dev, "enable", GPIOD_OUT_HIGH); |
| 244 | if (IS_ERR(priv->enable_gpio)) { |
| 245 | dev_err(&i2c->dev, "Failed to get 'enable' gpio\n"); |
| 246 | return PTR_ERR(priv->enable_gpio); |
| 247 | } |
| 248 | priv->enable_state = true; |
| 249 | |
| 250 | usleep_range(RT6160_I2CRDY_TIMEUS, RT6160_I2CRDY_TIMEUS + 100); |
| 251 | |
| 252 | priv->regmap = devm_regmap_init_i2c(i2c, &rt6160_regmap_config); |
| 253 | if (IS_ERR(priv->regmap)) { |
| 254 | ret = PTR_ERR(priv->regmap); |
| 255 | dev_err(&i2c->dev, "Failed to init regmap (%d)\n", ret); |
| 256 | return ret; |
| 257 | } |
| 258 | |
| 259 | ret = regmap_read(priv->regmap, RT6160_REG_DEVID, &devid); |
| 260 | if (ret) |
| 261 | return ret; |
| 262 | |
| 263 | if ((devid & RT6160_VID_MASK) != RT6160_VENDOR_ID) { |
| 264 | dev_err(&i2c->dev, "VID not correct [0x%02x]\n", devid); |
| 265 | return -ENODEV; |
| 266 | } |
| 267 | |
| 268 | priv->desc.name = "rt6160-buckboost"; |
| 269 | priv->desc.type = REGULATOR_VOLTAGE; |
| 270 | priv->desc.owner = THIS_MODULE; |
| 271 | priv->desc.min_uV = RT6160_VOUT_MINUV; |
| 272 | priv->desc.uV_step = RT6160_VOUT_STPUV; |
| 273 | if (vsel_active_low) |
| 274 | priv->desc.vsel_reg = RT6160_REG_VSELL; |
| 275 | else |
| 276 | priv->desc.vsel_reg = RT6160_REG_VSELH; |
| 277 | priv->desc.vsel_mask = RT6160_VSEL_MASK; |
| 278 | priv->desc.n_voltages = RT6160_N_VOUTS; |
| 279 | priv->desc.ramp_reg = RT6160_REG_CNTL; |
| 280 | priv->desc.ramp_mask = RT6160_RAMPRATE_MASK; |
| 281 | priv->desc.ramp_delay_table = rt6160_ramp_tables; |
| 282 | priv->desc.n_ramp_values = ARRAY_SIZE(rt6160_ramp_tables); |
| 283 | priv->desc.of_map_mode = rt6160_of_map_mode; |
| 284 | priv->desc.ops = &rt6160_regulator_ops; |
| 285 | |
| 286 | regulator_cfg.dev = &i2c->dev; |
| 287 | regulator_cfg.of_node = i2c->dev.of_node; |
| 288 | regulator_cfg.regmap = priv->regmap; |
| 289 | regulator_cfg.driver_data = priv; |
| 290 | regulator_cfg.init_data = of_get_regulator_init_data(&i2c->dev, i2c->dev.of_node, |
| 291 | &priv->desc); |
| 292 | |
| 293 | rdev = devm_regulator_register(&i2c->dev, &priv->desc, ®ulator_cfg); |
| 294 | if (IS_ERR(rdev)) { |
| 295 | dev_err(&i2c->dev, "Failed to register regulator\n"); |
| 296 | return PTR_ERR(rdev); |
| 297 | } |
| 298 | |
| 299 | return 0; |
| 300 | } |
| 301 | |
| 302 | static const struct of_device_id __maybe_unused rt6160_of_match_table[] = { |
| 303 | { .compatible = "richtek,rt6160", }, |
| 304 | {} |
| 305 | }; |
| 306 | MODULE_DEVICE_TABLE(of, rt6160_of_match_table); |
| 307 | |
| 308 | static struct i2c_driver rt6160_driver = { |
| 309 | .driver = { |
| 310 | .name = "rt6160", |
| 311 | .probe_type = PROBE_PREFER_ASYNCHRONOUS, |
| 312 | .of_match_table = rt6160_of_match_table, |
| 313 | }, |
| 314 | .probe = rt6160_probe, |
| 315 | }; |
| 316 | module_i2c_driver(rt6160_driver); |
| 317 | |
| 318 | MODULE_DESCRIPTION("Richtek RT6160 voltage regulator driver"); |
| 319 | MODULE_AUTHOR("ChiYuan Huang <cy_huang@richtek.com>"); |
| 320 | MODULE_LICENSE("GPL v2"); |