1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Driver for TPS65218 Integrated power management chipsets 4 * 5 * Copyright (C) 2014 Texas Instruments Incorporated - https://www.ti.com/ 6 */ 7 8 #include <linux/kernel.h> 9 #include <linux/device.h> 10 #include <linux/module.h> 11 #include <linux/platform_device.h> 12 #include <linux/init.h> 13 #include <linux/i2c.h> 14 #include <linux/slab.h> 15 #include <linux/regmap.h> 16 #include <linux/err.h> 17 #include <linux/of.h> 18 #include <linux/irq.h> 19 #include <linux/interrupt.h> 20 #include <linux/mutex.h> 21 22 #include <linux/mfd/core.h> 23 #include <linux/mfd/tps65218.h> 24 25 #define TPS65218_PASSWORD_REGS_UNLOCK 0x7D 26 27 static const struct mfd_cell tps65218_cells[] = { 28 { 29 .name = "tps65218-pwrbutton", 30 .of_compatible = "ti,tps65218-pwrbutton", 31 }, 32 { 33 .name = "tps65218-gpio", 34 .of_compatible = "ti,tps65218-gpio", 35 }, 36 { .name = "tps65218-regulator", }, 37 }; 38 39 /** 40 * tps65218_reg_write: Write a single tps65218 register. 41 * 42 * @tps: Device to write to. 43 * @reg: Register to write to. 44 * @val: Value to write. 45 * @level: Password protected level 46 */ 47 int tps65218_reg_write(struct tps65218 *tps, unsigned int reg, 48 unsigned int val, unsigned int level) 49 { 50 int ret; 51 unsigned int xor_reg_val; 52 53 switch (level) { 54 case TPS65218_PROTECT_NONE: 55 return regmap_write(tps->regmap, reg, val); 56 case TPS65218_PROTECT_L1: 57 xor_reg_val = reg ^ TPS65218_PASSWORD_REGS_UNLOCK; 58 ret = regmap_write(tps->regmap, TPS65218_REG_PASSWORD, 59 xor_reg_val); 60 if (ret < 0) 61 return ret; 62 63 return regmap_write(tps->regmap, reg, val); 64 default: 65 return -EINVAL; 66 } 67 } 68 EXPORT_SYMBOL_GPL(tps65218_reg_write); 69 70 /** 71 * tps65218_update_bits: Modify bits w.r.t mask, val and level. 72 * 73 * @tps: Device to write to. 74 * @reg: Register to read-write to. 75 * @mask: Mask. 76 * @val: Value to write. 77 * @level: Password protected level 78 */ 79 static int tps65218_update_bits(struct tps65218 *tps, unsigned int reg, 80 unsigned int mask, unsigned int val, unsigned int level) 81 { 82 int ret; 83 unsigned int data; 84 85 ret = regmap_read(tps->regmap, reg, &data); 86 if (ret) { 87 dev_err(tps->dev, "Read from reg 0x%x failed\n", reg); 88 return ret; 89 } 90 91 data &= ~mask; 92 data |= val & mask; 93 94 mutex_lock(&tps->tps_lock); 95 ret = tps65218_reg_write(tps, reg, data, level); 96 if (ret) 97 dev_err(tps->dev, "Write for reg 0x%x failed\n", reg); 98 mutex_unlock(&tps->tps_lock); 99 100 return ret; 101 } 102 103 int tps65218_set_bits(struct tps65218 *tps, unsigned int reg, 104 unsigned int mask, unsigned int val, unsigned int level) 105 { 106 return tps65218_update_bits(tps, reg, mask, val, level); 107 } 108 EXPORT_SYMBOL_GPL(tps65218_set_bits); 109 110 int tps65218_clear_bits(struct tps65218 *tps, unsigned int reg, 111 unsigned int mask, unsigned int level) 112 { 113 return tps65218_update_bits(tps, reg, mask, 0, level); 114 } 115 EXPORT_SYMBOL_GPL(tps65218_clear_bits); 116 117 static const struct regmap_range tps65218_yes_ranges[] = { 118 regmap_reg_range(TPS65218_REG_INT1, TPS65218_REG_INT2), 119 regmap_reg_range(TPS65218_REG_STATUS, TPS65218_REG_STATUS), 120 }; 121 122 static const struct regmap_access_table tps65218_volatile_table = { 123 .yes_ranges = tps65218_yes_ranges, 124 .n_yes_ranges = ARRAY_SIZE(tps65218_yes_ranges), 125 }; 126 127 static const struct regmap_config tps65218_regmap_config = { 128 .reg_bits = 8, 129 .val_bits = 8, 130 .cache_type = REGCACHE_RBTREE, 131 .volatile_table = &tps65218_volatile_table, 132 }; 133 134 static const struct regmap_irq tps65218_irqs[] = { 135 /* INT1 IRQs */ 136 [TPS65218_PRGC_IRQ] = { 137 .mask = TPS65218_INT1_PRGC, 138 }, 139 [TPS65218_CC_AQC_IRQ] = { 140 .mask = TPS65218_INT1_CC_AQC, 141 }, 142 [TPS65218_HOT_IRQ] = { 143 .mask = TPS65218_INT1_HOT, 144 }, 145 [TPS65218_PB_IRQ] = { 146 .mask = TPS65218_INT1_PB, 147 }, 148 [TPS65218_AC_IRQ] = { 149 .mask = TPS65218_INT1_AC, 150 }, 151 [TPS65218_VPRG_IRQ] = { 152 .mask = TPS65218_INT1_VPRG, 153 }, 154 [TPS65218_INVALID1_IRQ] = { 155 }, 156 [TPS65218_INVALID2_IRQ] = { 157 }, 158 /* INT2 IRQs*/ 159 [TPS65218_LS1_I_IRQ] = { 160 .mask = TPS65218_INT2_LS1_I, 161 .reg_offset = 1, 162 }, 163 [TPS65218_LS2_I_IRQ] = { 164 .mask = TPS65218_INT2_LS2_I, 165 .reg_offset = 1, 166 }, 167 [TPS65218_LS3_I_IRQ] = { 168 .mask = TPS65218_INT2_LS3_I, 169 .reg_offset = 1, 170 }, 171 [TPS65218_LS1_F_IRQ] = { 172 .mask = TPS65218_INT2_LS1_F, 173 .reg_offset = 1, 174 }, 175 [TPS65218_LS2_F_IRQ] = { 176 .mask = TPS65218_INT2_LS2_F, 177 .reg_offset = 1, 178 }, 179 [TPS65218_LS3_F_IRQ] = { 180 .mask = TPS65218_INT2_LS3_F, 181 .reg_offset = 1, 182 }, 183 [TPS65218_INVALID3_IRQ] = { 184 }, 185 [TPS65218_INVALID4_IRQ] = { 186 }, 187 }; 188 189 static struct regmap_irq_chip tps65218_irq_chip = { 190 .name = "tps65218", 191 .irqs = tps65218_irqs, 192 .num_irqs = ARRAY_SIZE(tps65218_irqs), 193 194 .num_regs = 2, 195 .mask_base = TPS65218_REG_INT_MASK1, 196 .status_base = TPS65218_REG_INT1, 197 }; 198 199 static const struct of_device_id of_tps65218_match_table[] = { 200 { .compatible = "ti,tps65218", }, 201 {} 202 }; 203 MODULE_DEVICE_TABLE(of, of_tps65218_match_table); 204 205 static int tps65218_voltage_set_strict(struct tps65218 *tps) 206 { 207 u32 strict; 208 209 if (of_property_read_u32(tps->dev->of_node, 210 "ti,strict-supply-voltage-supervision", 211 &strict)) 212 return 0; 213 214 if (strict != 0 && strict != 1) { 215 dev_err(tps->dev, 216 "Invalid ti,strict-supply-voltage-supervision value\n"); 217 return -EINVAL; 218 } 219 220 tps65218_update_bits(tps, TPS65218_REG_CONFIG1, 221 TPS65218_CONFIG1_STRICT, 222 strict ? TPS65218_CONFIG1_STRICT : 0, 223 TPS65218_PROTECT_L1); 224 return 0; 225 } 226 227 static int tps65218_voltage_set_uv_hyst(struct tps65218 *tps) 228 { 229 u32 hyst; 230 231 if (of_property_read_u32(tps->dev->of_node, 232 "ti,under-voltage-hyst-microvolt", &hyst)) 233 return 0; 234 235 if (hyst != 400000 && hyst != 200000) { 236 dev_err(tps->dev, 237 "Invalid ti,under-voltage-hyst-microvolt value\n"); 238 return -EINVAL; 239 } 240 241 tps65218_update_bits(tps, TPS65218_REG_CONFIG2, 242 TPS65218_CONFIG2_UVLOHYS, 243 hyst == 400000 ? TPS65218_CONFIG2_UVLOHYS : 0, 244 TPS65218_PROTECT_L1); 245 return 0; 246 } 247 248 static int tps65218_voltage_set_uvlo(struct tps65218 *tps) 249 { 250 u32 uvlo; 251 int uvloval; 252 253 if (of_property_read_u32(tps->dev->of_node, 254 "ti,under-voltage-limit-microvolt", &uvlo)) 255 return 0; 256 257 switch (uvlo) { 258 case 2750000: 259 uvloval = TPS65218_CONFIG1_UVLO_2750000; 260 break; 261 case 2950000: 262 uvloval = TPS65218_CONFIG1_UVLO_2950000; 263 break; 264 case 3250000: 265 uvloval = TPS65218_CONFIG1_UVLO_3250000; 266 break; 267 case 3350000: 268 uvloval = TPS65218_CONFIG1_UVLO_3350000; 269 break; 270 default: 271 dev_err(tps->dev, 272 "Invalid ti,under-voltage-limit-microvolt value\n"); 273 return -EINVAL; 274 } 275 276 tps65218_update_bits(tps, TPS65218_REG_CONFIG1, 277 TPS65218_CONFIG1_UVLO_MASK, uvloval, 278 TPS65218_PROTECT_L1); 279 return 0; 280 } 281 282 static int tps65218_probe(struct i2c_client *client) 283 { 284 struct tps65218 *tps; 285 int ret; 286 unsigned int chipid; 287 288 tps = devm_kzalloc(&client->dev, sizeof(*tps), GFP_KERNEL); 289 if (!tps) 290 return -ENOMEM; 291 292 i2c_set_clientdata(client, tps); 293 tps->dev = &client->dev; 294 tps->irq = client->irq; 295 tps->regmap = devm_regmap_init_i2c(client, &tps65218_regmap_config); 296 if (IS_ERR(tps->regmap)) { 297 ret = PTR_ERR(tps->regmap); 298 dev_err(tps->dev, "Failed to allocate register map: %d\n", 299 ret); 300 return ret; 301 } 302 303 mutex_init(&tps->tps_lock); 304 305 ret = devm_regmap_add_irq_chip(&client->dev, tps->regmap, tps->irq, 306 IRQF_ONESHOT, 0, &tps65218_irq_chip, 307 &tps->irq_data); 308 if (ret < 0) 309 return ret; 310 311 ret = regmap_read(tps->regmap, TPS65218_REG_CHIPID, &chipid); 312 if (ret) { 313 dev_err(tps->dev, "Failed to read chipid: %d\n", ret); 314 return ret; 315 } 316 317 tps->rev = chipid & TPS65218_CHIPID_REV_MASK; 318 319 ret = tps65218_voltage_set_strict(tps); 320 if (ret) 321 return ret; 322 323 ret = tps65218_voltage_set_uvlo(tps); 324 if (ret) 325 return ret; 326 327 ret = tps65218_voltage_set_uv_hyst(tps); 328 if (ret) 329 return ret; 330 331 ret = mfd_add_devices(tps->dev, PLATFORM_DEVID_AUTO, tps65218_cells, 332 ARRAY_SIZE(tps65218_cells), NULL, 0, 333 regmap_irq_get_domain(tps->irq_data)); 334 335 return ret; 336 } 337 338 static const struct i2c_device_id tps65218_id_table[] = { 339 { "tps65218", TPS65218 }, 340 { }, 341 }; 342 MODULE_DEVICE_TABLE(i2c, tps65218_id_table); 343 344 static struct i2c_driver tps65218_driver = { 345 .driver = { 346 .name = "tps65218", 347 .of_match_table = of_tps65218_match_table, 348 }, 349 .probe = tps65218_probe, 350 .id_table = tps65218_id_table, 351 }; 352 353 module_i2c_driver(tps65218_driver); 354 355 MODULE_AUTHOR("J Keerthy <j-keerthy@ti.com>"); 356 MODULE_DESCRIPTION("TPS65218 chip family multi-function driver"); 357 MODULE_LICENSE("GPL v2"); 358