1 /* 2 * Driver for TPS65218 Integrated power management chipsets 3 * 4 * Copyright (C) 2014 Texas Instruments Incorporated - http://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 /** 37 * tps65218_reg_read: Read a single tps65218 register. 38 * 39 * @tps: Device to read from. 40 * @reg: Register to read. 41 * @val: Contians the value 42 */ 43 int tps65218_reg_read(struct tps65218 *tps, unsigned int reg, 44 unsigned int *val) 45 { 46 return regmap_read(tps->regmap, reg, val); 47 } 48 EXPORT_SYMBOL_GPL(tps65218_reg_read); 49 50 /** 51 * tps65218_reg_write: Write a single tps65218 register. 52 * 53 * @tps65218: Device to write to. 54 * @reg: Register to write to. 55 * @val: Value to write. 56 * @level: Password protected level 57 */ 58 int tps65218_reg_write(struct tps65218 *tps, unsigned int reg, 59 unsigned int val, unsigned int level) 60 { 61 int ret; 62 unsigned int xor_reg_val; 63 64 switch (level) { 65 case TPS65218_PROTECT_NONE: 66 return regmap_write(tps->regmap, reg, val); 67 case TPS65218_PROTECT_L1: 68 xor_reg_val = reg ^ TPS65218_PASSWORD_REGS_UNLOCK; 69 ret = regmap_write(tps->regmap, TPS65218_REG_PASSWORD, 70 xor_reg_val); 71 if (ret < 0) 72 return ret; 73 74 return regmap_write(tps->regmap, reg, val); 75 default: 76 return -EINVAL; 77 } 78 } 79 EXPORT_SYMBOL_GPL(tps65218_reg_write); 80 81 /** 82 * tps65218_update_bits: Modify bits w.r.t mask, val and level. 83 * 84 * @tps65218: Device to write to. 85 * @reg: Register to read-write to. 86 * @mask: Mask. 87 * @val: Value to write. 88 * @level: Password protected level 89 */ 90 static int tps65218_update_bits(struct tps65218 *tps, unsigned int reg, 91 unsigned int mask, unsigned int val, unsigned int level) 92 { 93 int ret; 94 unsigned int data; 95 96 ret = tps65218_reg_read(tps, reg, &data); 97 if (ret) { 98 dev_err(tps->dev, "Read from reg 0x%x failed\n", reg); 99 return ret; 100 } 101 102 data &= ~mask; 103 data |= val & mask; 104 105 mutex_lock(&tps->tps_lock); 106 ret = tps65218_reg_write(tps, reg, data, level); 107 if (ret) 108 dev_err(tps->dev, "Write for reg 0x%x failed\n", reg); 109 mutex_unlock(&tps->tps_lock); 110 111 return ret; 112 } 113 114 int tps65218_set_bits(struct tps65218 *tps, unsigned int reg, 115 unsigned int mask, unsigned int val, unsigned int level) 116 { 117 return tps65218_update_bits(tps, reg, mask, val, level); 118 } 119 EXPORT_SYMBOL_GPL(tps65218_set_bits); 120 121 int tps65218_clear_bits(struct tps65218 *tps, unsigned int reg, 122 unsigned int mask, unsigned int level) 123 { 124 return tps65218_update_bits(tps, reg, mask, 0, level); 125 } 126 EXPORT_SYMBOL_GPL(tps65218_clear_bits); 127 128 static const struct regmap_range tps65218_yes_ranges[] = { 129 regmap_reg_range(TPS65218_REG_INT1, TPS65218_REG_INT2), 130 regmap_reg_range(TPS65218_REG_STATUS, TPS65218_REG_STATUS), 131 }; 132 133 static const struct regmap_access_table tps65218_volatile_table = { 134 .yes_ranges = tps65218_yes_ranges, 135 .n_yes_ranges = ARRAY_SIZE(tps65218_yes_ranges), 136 }; 137 138 static const struct regmap_config tps65218_regmap_config = { 139 .reg_bits = 8, 140 .val_bits = 8, 141 .cache_type = REGCACHE_RBTREE, 142 .volatile_table = &tps65218_volatile_table, 143 }; 144 145 static const struct regmap_irq tps65218_irqs[] = { 146 /* INT1 IRQs */ 147 [TPS65218_PRGC_IRQ] = { 148 .mask = TPS65218_INT1_PRGC, 149 }, 150 [TPS65218_CC_AQC_IRQ] = { 151 .mask = TPS65218_INT1_CC_AQC, 152 }, 153 [TPS65218_HOT_IRQ] = { 154 .mask = TPS65218_INT1_HOT, 155 }, 156 [TPS65218_PB_IRQ] = { 157 .mask = TPS65218_INT1_PB, 158 }, 159 [TPS65218_AC_IRQ] = { 160 .mask = TPS65218_INT1_AC, 161 }, 162 [TPS65218_VPRG_IRQ] = { 163 .mask = TPS65218_INT1_VPRG, 164 }, 165 [TPS65218_INVALID1_IRQ] = { 166 }, 167 [TPS65218_INVALID2_IRQ] = { 168 }, 169 /* INT2 IRQs*/ 170 [TPS65218_LS1_I_IRQ] = { 171 .mask = TPS65218_INT2_LS1_I, 172 .reg_offset = 1, 173 }, 174 [TPS65218_LS2_I_IRQ] = { 175 .mask = TPS65218_INT2_LS2_I, 176 .reg_offset = 1, 177 }, 178 [TPS65218_LS3_I_IRQ] = { 179 .mask = TPS65218_INT2_LS3_I, 180 .reg_offset = 1, 181 }, 182 [TPS65218_LS1_F_IRQ] = { 183 .mask = TPS65218_INT2_LS1_F, 184 .reg_offset = 1, 185 }, 186 [TPS65218_LS2_F_IRQ] = { 187 .mask = TPS65218_INT2_LS2_F, 188 .reg_offset = 1, 189 }, 190 [TPS65218_LS3_F_IRQ] = { 191 .mask = TPS65218_INT2_LS3_F, 192 .reg_offset = 1, 193 }, 194 [TPS65218_INVALID3_IRQ] = { 195 }, 196 [TPS65218_INVALID4_IRQ] = { 197 }, 198 }; 199 200 static struct regmap_irq_chip tps65218_irq_chip = { 201 .name = "tps65218", 202 .irqs = tps65218_irqs, 203 .num_irqs = ARRAY_SIZE(tps65218_irqs), 204 205 .num_regs = 2, 206 .mask_base = TPS65218_REG_INT_MASK1, 207 .status_base = TPS65218_REG_INT1, 208 }; 209 210 static const struct of_device_id of_tps65218_match_table[] = { 211 { .compatible = "ti,tps65218", }, 212 {} 213 }; 214 MODULE_DEVICE_TABLE(of, of_tps65218_match_table); 215 216 static int tps65218_probe(struct i2c_client *client, 217 const struct i2c_device_id *ids) 218 { 219 struct tps65218 *tps; 220 const struct of_device_id *match; 221 int ret; 222 223 match = of_match_device(of_tps65218_match_table, &client->dev); 224 if (!match) { 225 dev_err(&client->dev, 226 "Failed to find matching dt id\n"); 227 return -EINVAL; 228 } 229 230 tps = devm_kzalloc(&client->dev, sizeof(*tps), GFP_KERNEL); 231 if (!tps) 232 return -ENOMEM; 233 234 i2c_set_clientdata(client, tps); 235 tps->dev = &client->dev; 236 tps->irq = client->irq; 237 tps->regmap = devm_regmap_init_i2c(client, &tps65218_regmap_config); 238 if (IS_ERR(tps->regmap)) { 239 ret = PTR_ERR(tps->regmap); 240 dev_err(tps->dev, "Failed to allocate register map: %d\n", 241 ret); 242 return ret; 243 } 244 245 mutex_init(&tps->tps_lock); 246 247 ret = regmap_add_irq_chip(tps->regmap, tps->irq, 248 IRQF_ONESHOT, 0, &tps65218_irq_chip, 249 &tps->irq_data); 250 if (ret < 0) 251 return ret; 252 253 ret = of_platform_populate(client->dev.of_node, NULL, NULL, 254 &client->dev); 255 if (ret < 0) 256 goto err_irq; 257 258 return 0; 259 260 err_irq: 261 regmap_del_irq_chip(tps->irq, tps->irq_data); 262 263 return ret; 264 } 265 266 static int tps65218_remove(struct i2c_client *client) 267 { 268 struct tps65218 *tps = i2c_get_clientdata(client); 269 270 regmap_del_irq_chip(tps->irq, tps->irq_data); 271 272 return 0; 273 } 274 275 static const struct i2c_device_id tps65218_id_table[] = { 276 { "tps65218", TPS65218 }, 277 { }, 278 }; 279 MODULE_DEVICE_TABLE(i2c, tps65218_id_table); 280 281 static struct i2c_driver tps65218_driver = { 282 .driver = { 283 .name = "tps65218", 284 .of_match_table = of_tps65218_match_table, 285 }, 286 .probe = tps65218_probe, 287 .remove = tps65218_remove, 288 .id_table = tps65218_id_table, 289 }; 290 291 module_i2c_driver(tps65218_driver); 292 293 MODULE_AUTHOR("J Keerthy <j-keerthy@ti.com>"); 294 MODULE_DESCRIPTION("TPS65218 chip family multi-function driver"); 295 MODULE_LICENSE("GPL v2"); 296