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 struct regmap_config tps65218_regmap_config = { 129 .reg_bits = 8, 130 .val_bits = 8, 131 .cache_type = REGCACHE_RBTREE, 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 }; 197 198 static const struct of_device_id of_tps65218_match_table[] = { 199 { .compatible = "ti,tps65218", }, 200 {} 201 }; 202 203 static int tps65218_probe(struct i2c_client *client, 204 const struct i2c_device_id *ids) 205 { 206 struct tps65218 *tps; 207 const struct of_device_id *match; 208 int ret; 209 210 match = of_match_device(of_tps65218_match_table, &client->dev); 211 if (!match) { 212 dev_err(&client->dev, 213 "Failed to find matching dt id\n"); 214 return -EINVAL; 215 } 216 217 tps = devm_kzalloc(&client->dev, sizeof(*tps), GFP_KERNEL); 218 if (!tps) 219 return -ENOMEM; 220 221 i2c_set_clientdata(client, tps); 222 tps->dev = &client->dev; 223 tps->irq = client->irq; 224 tps->regmap = devm_regmap_init_i2c(client, &tps65218_regmap_config); 225 if (IS_ERR(tps->regmap)) { 226 ret = PTR_ERR(tps->regmap); 227 dev_err(tps->dev, "Failed to allocate register map: %d\n", 228 ret); 229 return ret; 230 } 231 232 mutex_init(&tps->tps_lock); 233 234 ret = regmap_add_irq_chip(tps->regmap, tps->irq, 235 IRQF_ONESHOT, 0, &tps65218_irq_chip, 236 &tps->irq_data); 237 if (ret < 0) 238 return ret; 239 240 ret = of_platform_populate(client->dev.of_node, NULL, NULL, 241 &client->dev); 242 if (ret < 0) 243 goto err_irq; 244 245 return 0; 246 247 err_irq: 248 regmap_del_irq_chip(tps->irq, tps->irq_data); 249 250 return ret; 251 } 252 253 static int tps65218_remove(struct i2c_client *client) 254 { 255 struct tps65218 *tps = i2c_get_clientdata(client); 256 257 regmap_del_irq_chip(tps->irq, tps->irq_data); 258 259 return 0; 260 } 261 262 static const struct i2c_device_id tps65218_id_table[] = { 263 { "tps65218", TPS65218 }, 264 { }, 265 }; 266 MODULE_DEVICE_TABLE(i2c, tps65218_id_table); 267 268 static struct i2c_driver tps65218_driver = { 269 .driver = { 270 .name = "tps65218", 271 .owner = THIS_MODULE, 272 .of_match_table = of_tps65218_match_table, 273 }, 274 .probe = tps65218_probe, 275 .remove = tps65218_remove, 276 .id_table = tps65218_id_table, 277 }; 278 279 module_i2c_driver(tps65218_driver); 280 281 MODULE_AUTHOR("J Keerthy <j-keerthy@ti.com>"); 282 MODULE_DESCRIPTION("TPS65218 chip family multi-function driver"); 283 MODULE_LICENSE("GPL v2"); 284