kernel/drivers/mfd/tps65090.c

   1 /*
   2  * Core driver for TI TPS65090 PMIC family
   3  *
   4  * Copyright (c) 2012, NVIDIA CORPORATION.  All rights reserved.
   5
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms and conditions of the GNU General Public License,
   8  * version 2, as published by the Free Software Foundation.
   9
  10  * This program is distributed in the hope it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  13  * more details.
  14
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19 #include <linux/interrupt.h>
  20 #include <linux/irq.h>
  21 #include <linux/kernel.h>
  22 #include <linux/module.h>
  23 #include <linux/mutex.h>
  24 #include <linux/slab.h>
  25 #include <linux/i2c.h>
  26 #include <linux/mfd/core.h>
  27 #include <linux/mfd/tps65090.h>
  28 #include <linux/of.h>
  29 #include <linux/of_device.h>
  30 #include <linux/err.h>
  31
  32 #define NUM_INT_REG 2
  33 #define TOTAL_NUM_REG 0x18
  34
  35 #define TPS65090_INT1_MASK_VAC_STATUS_CHANGE            1
  36 #define TPS65090_INT1_MASK_VSYS_STATUS_CHANGE           2
  37 #define TPS65090_INT1_MASK_BAT_STATUS_CHANGE            3
  38 #define TPS65090_INT1_MASK_CHARGING_STATUS_CHANGE       4
  39 #define TPS65090_INT1_MASK_CHARGING_COMPLETE            5
  40 #define TPS65090_INT1_MASK_OVERLOAD_DCDC1               6
  41 #define TPS65090_INT1_MASK_OVERLOAD_DCDC2               7
  42 #define TPS65090_INT2_MASK_OVERLOAD_DCDC3               0
  43 #define TPS65090_INT2_MASK_OVERLOAD_FET1                1
  44 #define TPS65090_INT2_MASK_OVERLOAD_FET2                2
  45 #define TPS65090_INT2_MASK_OVERLOAD_FET3                3
  46 #define TPS65090_INT2_MASK_OVERLOAD_FET4                4
  47 #define TPS65090_INT2_MASK_OVERLOAD_FET5                5
  48 #define TPS65090_INT2_MASK_OVERLOAD_FET6                6
  49 #define TPS65090_INT2_MASK_OVERLOAD_FET7                7
  50
  51 static struct resource charger_resources[] = {
  52         {
  53                 .start  = TPS65090_IRQ_VAC_STATUS_CHANGE,
  54                 .end    = TPS65090_IRQ_VAC_STATUS_CHANGE,
  55                 .flags  = IORESOURCE_IRQ,
  56         }
  57 };
  58
  59 enum tps65090_cells {
  60         PMIC = 0,
  61         CHARGER = 1,
  62 };
  63
  64 static struct mfd_cell tps65090s[] = {
  65         [PMIC] = {
  66                 .name = "tps65090-pmic",
  67         },
  68         [CHARGER] = {
  69                 .name = "tps65090-charger",
  70                 .num_resources = ARRAY_SIZE(charger_resources),
  71                 .resources = &charger_resources[0],
  72                 .of_compatible = "ti,tps65090-charger",
  73         },
  74 };
  75
  76 static const struct regmap_irq tps65090_irqs[] = {
  77         /* INT1 IRQs*/
  78         [TPS65090_IRQ_VAC_STATUS_CHANGE] = {
  79                 .mask = TPS65090_INT1_MASK_VAC_STATUS_CHANGE,
  80         },
  81         [TPS65090_IRQ_VSYS_STATUS_CHANGE] = {
  82                 .mask = TPS65090_INT1_MASK_VSYS_STATUS_CHANGE,
  83         },
  84         [TPS65090_IRQ_BAT_STATUS_CHANGE] = {
  85                 .mask = TPS65090_INT1_MASK_BAT_STATUS_CHANGE,
  86         },
  87         [TPS65090_IRQ_CHARGING_STATUS_CHANGE] = {
  88                 .mask = TPS65090_INT1_MASK_CHARGING_STATUS_CHANGE,
  89         },
  90         [TPS65090_IRQ_CHARGING_COMPLETE] = {
  91                 .mask = TPS65090_INT1_MASK_CHARGING_COMPLETE,
  92         },
  93         [TPS65090_IRQ_OVERLOAD_DCDC1] = {
  94                 .mask = TPS65090_INT1_MASK_OVERLOAD_DCDC1,
  95         },
  96         [TPS65090_IRQ_OVERLOAD_DCDC2] = {
  97                 .mask = TPS65090_INT1_MASK_OVERLOAD_DCDC2,
  98         },
  99         /* INT2 IRQs*/
 100         [TPS65090_IRQ_OVERLOAD_DCDC3] = {
 101                 .reg_offset = 1,
 102                 .mask = TPS65090_INT2_MASK_OVERLOAD_DCDC3,
 103         },
 104         [TPS65090_IRQ_OVERLOAD_FET1] = {
 105                 .reg_offset = 1,
 106                 .mask = TPS65090_INT2_MASK_OVERLOAD_FET1,
 107         },
 108         [TPS65090_IRQ_OVERLOAD_FET2] = {
 109                 .reg_offset = 1,
 110                 .mask = TPS65090_INT2_MASK_OVERLOAD_FET2,
 111         },
 112         [TPS65090_IRQ_OVERLOAD_FET3] = {
 113                 .reg_offset = 1,
 114                 .mask = TPS65090_INT2_MASK_OVERLOAD_FET3,
 115         },
 116         [TPS65090_IRQ_OVERLOAD_FET4] = {
 117                 .reg_offset = 1,
 118                 .mask = TPS65090_INT2_MASK_OVERLOAD_FET4,
 119         },
 120         [TPS65090_IRQ_OVERLOAD_FET5] = {
 121                 .reg_offset = 1,
 122                 .mask = TPS65090_INT2_MASK_OVERLOAD_FET5,
 123         },
 124         [TPS65090_IRQ_OVERLOAD_FET6] = {
 125                 .reg_offset = 1,
 126                 .mask = TPS65090_INT2_MASK_OVERLOAD_FET6,
 127         },
 128         [TPS65090_IRQ_OVERLOAD_FET7] = {
 129                 .reg_offset = 1,
 130                 .mask = TPS65090_INT2_MASK_OVERLOAD_FET7,
 131         },
 132 };
 133
 134 static struct regmap_irq_chip tps65090_irq_chip = {
 135         .name = "tps65090",
 136         .irqs = tps65090_irqs,
 137         .num_irqs = ARRAY_SIZE(tps65090_irqs),
 138         .num_regs = NUM_INT_REG,
 139         .status_base = TPS65090_REG_INTR_STS,
 140         .mask_base = TPS65090_REG_INTR_MASK,
 141         .mask_invert = true,
 142 };
 143
 144 static bool is_volatile_reg(struct device *dev, unsigned int reg)
 145 {
 146         /* Nearly all registers have status bits mixed in, except a few */
 147         switch (reg) {
 148         case TPS65090_REG_INTR_MASK:
 149         case TPS65090_REG_INTR_MASK2:
 150         case TPS65090_REG_CG_CTRL0:
 151         case TPS65090_REG_CG_CTRL1:
 152         case TPS65090_REG_CG_CTRL2:
 153         case TPS65090_REG_CG_CTRL3:
 154         case TPS65090_REG_CG_CTRL4:
 155         case TPS65090_REG_CG_CTRL5:
 156                 return false;
 157         }
 158         return true;
 159 }
 160
 161 static const struct regmap_config tps65090_regmap_config = {
 162         .reg_bits = 8,
 163         .val_bits = 8,
 164         .max_register = TOTAL_NUM_REG,
 165         .num_reg_defaults_raw = TOTAL_NUM_REG,
 166         .cache_type = REGCACHE_RBTREE,
 167         .volatile_reg = is_volatile_reg,
 168 };
 169
 170 #ifdef CONFIG_OF
 171 static const struct of_device_id tps65090_of_match[] = {
 172         { .compatible = "ti,tps65090",},
 173         {},
 174 };
 175 MODULE_DEVICE_TABLE(of, tps65090_of_match);
 176 #endif
 177
 178 static int tps65090_i2c_probe(struct i2c_client *client,
 179                               const struct i2c_device_id *id)
 180 {
 181         struct tps65090_platform_data *pdata = dev_get_platdata(&client->dev);
 182         int irq_base = 0;
 183         struct tps65090 *tps65090;
 184         int ret;
 185
 186         if (!pdata && !client->dev.of_node) {
 187                 dev_err(&client->dev,
 188                         "tps65090 requires platform data or of_node\n");
 189                 return -EINVAL;
 190         }
 191
 192         if (pdata)
 193                 irq_base = pdata->irq_base;
 194
 195         tps65090 = devm_kzalloc(&client->dev, sizeof(*tps65090), GFP_KERNEL);
 196         if (!tps65090) {
 197                 dev_err(&client->dev, "mem alloc for tps65090 failed\n");
 198                 return -ENOMEM;
 199         }
 200
 201         tps65090->dev = &client->dev;
 202         i2c_set_clientdata(client, tps65090);
 203
 204         tps65090->rmap = devm_regmap_init_i2c(client, &tps65090_regmap_config);
 205         if (IS_ERR(tps65090->rmap)) {
 206                 ret = PTR_ERR(tps65090->rmap);
 207                 dev_err(&client->dev, "regmap_init failed with err: %d\n", ret);
 208                 return ret;
 209         }
 210
 211         if (client->irq) {
 212                 ret = regmap_add_irq_chip(tps65090->rmap, client->irq,
 213                                           IRQF_ONESHOT | IRQF_TRIGGER_LOW, irq_base,
 214                                           &tps65090_irq_chip, &tps65090->irq_data);
 215                 if (ret) {
 216                         dev_err(&client->dev,
 217                                 "IRQ init failed with err: %d\n", ret);
 218                         return ret;
 219                 }
 220         } else {
 221                 /* Don't tell children they have an IRQ that'll never fire */
 222                 tps65090s[CHARGER].num_resources = 0;
 223         }
 224
 225         ret = mfd_add_devices(tps65090->dev, -1, tps65090s,
 226                               ARRAY_SIZE(tps65090s), NULL,
 227                               0, regmap_irq_get_domain(tps65090->irq_data));
 228         if (ret) {
 229                 dev_err(&client->dev, "add mfd devices failed with err: %d\n",
 230                         ret);
 231                 goto err_irq_exit;
 232         }
 233
 234         return 0;
 235
 236 err_irq_exit:
 237         if (client->irq)
 238                 regmap_del_irq_chip(client->irq, tps65090->irq_data);
 239         return ret;
 240 }
 241
 242 static int tps65090_i2c_remove(struct i2c_client *client)
 243 {
 244         struct tps65090 *tps65090 = i2c_get_clientdata(client);
 245
 246         mfd_remove_devices(tps65090->dev);
 247         if (client->irq)
 248                 regmap_del_irq_chip(client->irq, tps65090->irq_data);
 249
 250         return 0;
 251 }
 252
 253 static const struct i2c_device_id tps65090_id_table[] = {
 254         { "tps65090", 0 },
 255         { },
 256 };
 257 MODULE_DEVICE_TABLE(i2c, tps65090_id_table);
 258
 259 static struct i2c_driver tps65090_driver = {
 260         .driver = {
 261                 .name   = "tps65090",
 262                 .owner  = THIS_MODULE,
 263                 .of_match_table = of_match_ptr(tps65090_of_match),
 264         },
 265         .probe          = tps65090_i2c_probe,
 266         .remove         = tps65090_i2c_remove,
 267         .id_table       = tps65090_id_table,
 268 };
 269
 270 static int __init tps65090_init(void)
 271 {
 272         return i2c_add_driver(&tps65090_driver);
 273 }
 274 subsys_initcall(tps65090_init);
 275
 276 static void __exit tps65090_exit(void)
 277 {
 278         i2c_del_driver(&tps65090_driver);
 279 }
 280 module_exit(tps65090_exit);
 281
 282 MODULE_DESCRIPTION("TPS65090 core driver");
 283 MODULE_AUTHOR("Venu Byravarasu <vbyravarasu@nvidia.com>");
 284 MODULE_LICENSE("GPL v2");