1 /* 2 * Driver for TPS65218 Integrated power management chipsets 3 * 4 * Copyright (C) 2014 Texas Instruments Incorporated - https://www.ti.com/ 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License version 2 as 8 * published by the Free Software Foundation. 9 * 10 * This program is distributed "as is" WITHOUT ANY WARRANTY of any 11 * kind, whether expressed or implied; without even the implied warranty 12 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 * GNU General Public License version 2 for more details. 14 */ 15 16 #include <linux/kernel.h> 17 #include <linux/device.h> 18 #include <linux/module.h> 19 #include <linux/platform_device.h> 20 #include <linux/init.h> 21 #include <linux/i2c.h> 22 #include <linux/slab.h> 23 #include <linux/regmap.h> 24 #include <linux/err.h> 25 #include <linux/of.h> 26 #include <linux/of_device.h> 27 #include <linux/irq.h> 28 #include <linux/interrupt.h> 29 #include <linux/mutex.h> 30 31 #include <linux/mfd/core.h> 32 #include <linux/mfd/tps65218.h> 33 34 #define TPS65218_PASSWORD_REGS_UNLOCK 0x7D 35 36 static const struct mfd_cell tps65218_cells[] = { 37 { 38 .name = "tps65218-pwrbutton", 39 .of_compatible = "ti,tps65218-pwrbutton", 40 }, 41 { 42 .name = "tps65218-gpio", 43 .of_compatible = "ti,tps65218-gpio", 44 }, 45 { .name = "tps65218-regulator", }, 46 }; 47 48 /** 49 * tps65218_reg_write: Write a single tps65218 register. 50 * 51 * @tps: Device to write to. 52 * @reg: Register to write to. 53 * @val: Value to write. 54 * @level: Password protected level 55 */ 56 int tps65218_reg_write(struct tps65218 *tps, unsigned int reg, 57 unsigned int val, unsigned int level) 58 { 59 int ret; 60 unsigned int xor_reg_val; 61 62 switch (level) { 63 case TPS65218_PROTECT_NONE: 64 return regmap_write(tps->regmap, reg, val); 65 case TPS65218_PROTECT_L1: 66 xor_reg_val = reg ^ TPS65218_PASSWORD_REGS_UNLOCK; 67 ret = regmap_write(tps->regmap, TPS65218_REG_PASSWORD, 68 xor_reg_val); 69 if (ret < 0) 70 return ret; 71 72 return regmap_write(tps->regmap, reg, val); 73 default: 74 return -EINVAL; 75 } 76 } 77 EXPORT_SYMBOL_GPL(tps65218_reg_write); 78 79 /** 80 * tps65218_update_bits: Modify bits w.r.t mask, val and level. 81 * 82 * @tps: Device to write to. 83 * @reg: Register to read-write to. 84 * @mask: Mask. 85 * @val: Value to write. 86 * @level: Password protected level 87 */ 88 static int tps65218_update_bits(struct tps65218 *tps, unsigned int reg, 89 unsigned int mask, unsigned int val, unsigned int level) 90 { 91 int ret; 92 unsigned int data; 93 94 ret = regmap_read(tps->regmap, reg, &data); 95 if (ret) { 96 dev_err(tps->dev, "Read from reg 0x%x failed\n", reg); 97 return ret; 98 } 99 100 data &= ~mask; 101 data |= val & mask; 102 103 mutex_lock(&tps->tps_lock); 104 ret = tps65218_reg_write(tps, reg, data, level); 105 if (ret) 106 dev_err(tps->dev, "Write for reg 0x%x failed\n", reg); 107 mutex_unlock(&tps->tps_lock); 108 109 return ret; 110 } 111 112 int tps65218_set_bits(struct tps65218 *tps, unsigned int reg, 113 unsigned int mask, unsigned int val, unsigned int level) 114 { 115 return tps65218_update_bits(tps, reg, mask, val, level); 116 } 117 EXPORT_SYMBOL_GPL(tps65218_set_bits); 118 119 int tps65218_clear_bits(struct tps65218 *tps, unsigned int reg, 120 unsigned int mask, unsigned int level) 121 { 122 return tps65218_update_bits(tps, reg, mask, 0, level); 123 } 124 EXPORT_SYMBOL_GPL(tps65218_clear_bits); 125 126 static const struct regmap_range tps65218_yes_ranges[] = { 127 regmap_reg_range(TPS65218_REG_INT1, TPS65218_REG_INT2), 128 regmap_reg_range(TPS65218_REG_STATUS, TPS65218_REG_STATUS), 129 }; 130 131 static const struct regmap_access_table tps65218_volatile_table = { 132 .yes_ranges = tps65218_yes_ranges, 133 .n_yes_ranges = ARRAY_SIZE(tps65218_yes_ranges), 134 }; 135 136 static const struct regmap_config tps65218_regmap_config = { 137 .reg_bits = 8, 138 .val_bits = 8, 139 .cache_type = REGCACHE_RBTREE, 140 .volatile_table = &tps65218_volatile_table, 141 }; 142 143 static const struct regmap_irq tps65218_irqs[] = { 144 /* INT1 IRQs */ 145 [TPS65218_PRGC_IRQ] = { 146 .mask = TPS65218_INT1_PRGC, 147 }, 148 [TPS65218_CC_AQC_IRQ] = { 149 .mask = TPS65218_INT1_CC_AQC, 150 }, 151 [TPS65218_HOT_IRQ] = { 152 .mask = TPS65218_INT1_HOT, 153 }, 154 [TPS65218_PB_IRQ] = { 155 .mask = TPS65218_INT1_PB, 156 }, 157 [TPS65218_AC_IRQ] = { 158 .mask = TPS65218_INT1_AC, 159 }, 160 [TPS65218_VPRG_IRQ] = { 161 .mask = TPS65218_INT1_VPRG, 162 }, 163 [TPS65218_INVALID1_IRQ] = { 164 }, 165 [TPS65218_INVALID2_IRQ] = { 166 }, 167 /* INT2 IRQs*/ 168 [TPS65218_LS1_I_IRQ] = { 169 .mask = TPS65218_INT2_LS1_I, 170 .reg_offset = 1, 171 }, 172 [TPS65218_LS2_I_IRQ] = { 173 .mask = TPS65218_INT2_LS2_I, 174 .reg_offset = 1, 175 }, 176 [TPS65218_LS3_I_IRQ] = { 177 .mask = TPS65218_INT2_LS3_I, 178 .reg_offset = 1, 179 }, 180 [TPS65218_LS1_F_IRQ] = { 181 .mask = TPS65218_INT2_LS1_F, 182 .reg_offset = 1, 183 }, 184 [TPS65218_LS2_F_IRQ] = { 185 .mask = TPS65218_INT2_LS2_F, 186 .reg_offset = 1, 187 }, 188 [TPS65218_LS3_F_IRQ] = { 189 .mask = TPS65218_INT2_LS3_F, 190 .reg_offset = 1, 191 }, 192 [TPS65218_INVALID3_IRQ] = { 193 }, 194 [TPS65218_INVALID4_IRQ] = { 195 }, 196 }; 197 198 static struct regmap_irq_chip tps65218_irq_chip = { 199 .name = "tps65218", 200 .irqs = tps65218_irqs, 201 .num_irqs = ARRAY_SIZE(tps65218_irqs), 202 203 .num_regs = 2, 204 .mask_base = TPS65218_REG_INT_MASK1, 205 .status_base = TPS65218_REG_INT1, 206 }; 207 208 static const struct of_device_id of_tps65218_match_table[] = { 209 { .compatible = "ti,tps65218", }, 210 {} 211 }; 212 MODULE_DEVICE_TABLE(of, of_tps65218_match_table); 213 214 static int tps65218_voltage_set_strict(struct tps65218 *tps) 215 { 216 u32 strict; 217 218 if (of_property_read_u32(tps->dev->of_node, 219 "ti,strict-supply-voltage-supervision", 220 &strict)) 221 return 0; 222 223 if (strict != 0 && strict != 1) { 224 dev_err(tps->dev, 225 "Invalid ti,strict-supply-voltage-supervision value\n"); 226 return -EINVAL; 227 } 228 229 tps65218_update_bits(tps, TPS65218_REG_CONFIG1, 230 TPS65218_CONFIG1_STRICT, 231 strict ? TPS65218_CONFIG1_STRICT : 0, 232 TPS65218_PROTECT_L1); 233 return 0; 234 } 235 236 static int tps65218_voltage_set_uv_hyst(struct tps65218 *tps) 237 { 238 u32 hyst; 239 240 if (of_property_read_u32(tps->dev->of_node, 241 "ti,under-voltage-hyst-microvolt", &hyst)) 242 return 0; 243 244 if (hyst != 400000 && hyst != 200000) { 245 dev_err(tps->dev, 246 "Invalid ti,under-voltage-hyst-microvolt value\n"); 247 return -EINVAL; 248 } 249 250 tps65218_update_bits(tps, TPS65218_REG_CONFIG2, 251 TPS65218_CONFIG2_UVLOHYS, 252 hyst == 400000 ? TPS65218_CONFIG2_UVLOHYS : 0, 253 TPS65218_PROTECT_L1); 254 return 0; 255 } 256 257 static int tps65218_voltage_set_uvlo(struct tps65218 *tps) 258 { 259 u32 uvlo; 260 int uvloval; 261 262 if (of_property_read_u32(tps->dev->of_node, 263 "ti,under-voltage-limit-microvolt", &uvlo)) 264 return 0; 265 266 switch (uvlo) { 267 case 2750000: 268 uvloval = TPS65218_CONFIG1_UVLO_2750000; 269 break; 270 case 2950000: 271 uvloval = TPS65218_CONFIG1_UVLO_2950000; 272 break; 273 case 3250000: 274 uvloval = TPS65218_CONFIG1_UVLO_3250000; 275 break; 276 case 3350000: 277 uvloval = TPS65218_CONFIG1_UVLO_3350000; 278 break; 279 default: 280 dev_err(tps->dev, 281 "Invalid ti,under-voltage-limit-microvolt value\n"); 282 return -EINVAL; 283 } 284 285 tps65218_update_bits(tps, TPS65218_REG_CONFIG1, 286 TPS65218_CONFIG1_UVLO_MASK, uvloval, 287 TPS65218_PROTECT_L1); 288 return 0; 289 } 290 291 static int tps65218_probe(struct i2c_client *client, 292 const struct i2c_device_id *ids) 293 { 294 struct tps65218 *tps; 295 int ret; 296 unsigned int chipid; 297 298 tps = devm_kzalloc(&client->dev, sizeof(*tps), GFP_KERNEL); 299 if (!tps) 300 return -ENOMEM; 301 302 i2c_set_clientdata(client, tps); 303 tps->dev = &client->dev; 304 tps->irq = client->irq; 305 tps->regmap = devm_regmap_init_i2c(client, &tps65218_regmap_config); 306 if (IS_ERR(tps->regmap)) { 307 ret = PTR_ERR(tps->regmap); 308 dev_err(tps->dev, "Failed to allocate register map: %d\n", 309 ret); 310 return ret; 311 } 312 313 mutex_init(&tps->tps_lock); 314 315 ret = devm_regmap_add_irq_chip(&client->dev, tps->regmap, tps->irq, 316 IRQF_ONESHOT, 0, &tps65218_irq_chip, 317 &tps->irq_data); 318 if (ret < 0) 319 return ret; 320 321 ret = regmap_read(tps->regmap, TPS65218_REG_CHIPID, &chipid); 322 if (ret) { 323 dev_err(tps->dev, "Failed to read chipid: %d\n", ret); 324 return ret; 325 } 326 327 tps->rev = chipid & TPS65218_CHIPID_REV_MASK; 328 329 ret = tps65218_voltage_set_strict(tps); 330 if (ret) 331 return ret; 332 333 ret = tps65218_voltage_set_uvlo(tps); 334 if (ret) 335 return ret; 336 337 ret = tps65218_voltage_set_uv_hyst(tps); 338 if (ret) 339 return ret; 340 341 ret = mfd_add_devices(tps->dev, PLATFORM_DEVID_AUTO, tps65218_cells, 342 ARRAY_SIZE(tps65218_cells), NULL, 0, 343 regmap_irq_get_domain(tps->irq_data)); 344 345 return ret; 346 } 347 348 static const struct i2c_device_id tps65218_id_table[] = { 349 { "tps65218", TPS65218 }, 350 { }, 351 }; 352 MODULE_DEVICE_TABLE(i2c, tps65218_id_table); 353 354 static struct i2c_driver tps65218_driver = { 355 .driver = { 356 .name = "tps65218", 357 .of_match_table = of_tps65218_match_table, 358 }, 359 .probe = tps65218_probe, 360 .id_table = tps65218_id_table, 361 }; 362 363 module_i2c_driver(tps65218_driver); 364 365 MODULE_AUTHOR("J Keerthy <j-keerthy@ti.com>"); 366 MODULE_DESCRIPTION("TPS65218 chip family multi-function driver"); 367 MODULE_LICENSE("GPL v2"); 368