drivers/mfd/ti-lmu.c

   1 /*
   2  * TI LMU (Lighting Management Unit) Core Driver
   3  *
   4  * Copyright 2017 Texas Instruments
   5  *
   6  * Author: Milo Kim <milo.kim@ti.com>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  */
  12
  13 #include <linux/delay.h>
  14 #include <linux/err.h>
  15 #include <linux/gpio.h>
  16 #include <linux/i2c.h>
  17 #include <linux/kernel.h>
  18 #include <linux/mfd/core.h>
  19 #include <linux/mfd/ti-lmu.h>
  20 #include <linux/mfd/ti-lmu-register.h>
  21 #include <linux/module.h>
  22 #include <linux/of.h>
  23 #include <linux/of_device.h>
  24 #include <linux/of_gpio.h>
  25 #include <linux/slab.h>
  26
  27 struct ti_lmu_data {
  28         struct mfd_cell *cells;
  29         int num_cells;
  30         unsigned int max_register;
  31 };
  32
  33 static int ti_lmu_enable_hw(struct ti_lmu *lmu, enum ti_lmu_id id)
  34 {
  35         int ret;
  36
  37         if (gpio_is_valid(lmu->en_gpio)) {
  38                 ret = devm_gpio_request_one(lmu->dev, lmu->en_gpio,
  39                                             GPIOF_OUT_INIT_HIGH, "lmu_hwen");
  40                 if (ret) {
  41                         dev_err(lmu->dev, "Can not request enable GPIO: %d\n",
  42                                 ret);
  43                         return ret;
  44                 }
  45         }
  46
  47         /* Delay about 1ms after HW enable pin control */
  48         usleep_range(1000, 1500);
  49
  50         /* LM3631 has additional power up sequence - enable LCD_EN bit. */
  51         if (id == LM3631) {
  52                 return regmap_update_bits(lmu->regmap, LM3631_REG_DEVCTRL,
  53                                           LM3631_LCD_EN_MASK,
  54                                           LM3631_LCD_EN_MASK);
  55         }
  56
  57         return 0;
  58 }
  59
  60 static void ti_lmu_disable_hw(struct ti_lmu *lmu)
  61 {
  62         if (gpio_is_valid(lmu->en_gpio))
  63                 gpio_set_value(lmu->en_gpio, 0);
  64 }
  65
  66 static struct mfd_cell lm3532_devices[] = {
  67         {
  68                 .name          = "ti-lmu-backlight",
  69                 .id            = LM3532,
  70                 .of_compatible = "ti,lm3532-backlight",
  71         },
  72 };
  73
  74 #define LM363X_REGULATOR(_id)                   \
  75 {                                               \
  76         .name          = "lm363x-regulator",    \
  77         .id            = _id,                   \
  78         .of_compatible = "ti,lm363x-regulator", \
  79 }                                               \
  80
  81 static struct mfd_cell lm3631_devices[] = {
  82         LM363X_REGULATOR(LM3631_BOOST),
  83         LM363X_REGULATOR(LM3631_LDO_CONT),
  84         LM363X_REGULATOR(LM3631_LDO_OREF),
  85         LM363X_REGULATOR(LM3631_LDO_POS),
  86         LM363X_REGULATOR(LM3631_LDO_NEG),
  87         {
  88                 .name          = "ti-lmu-backlight",
  89                 .id            = LM3631,
  90                 .of_compatible = "ti,lm3631-backlight",
  91         },
  92 };
  93
  94 static struct mfd_cell lm3632_devices[] = {
  95         LM363X_REGULATOR(LM3632_BOOST),
  96         LM363X_REGULATOR(LM3632_LDO_POS),
  97         LM363X_REGULATOR(LM3632_LDO_NEG),
  98         {
  99                 .name          = "ti-lmu-backlight",
 100                 .id            = LM3632,
 101                 .of_compatible = "ti,lm3632-backlight",
 102         },
 103 };
 104
 105 static struct mfd_cell lm3633_devices[] = {
 106         {
 107                 .name          = "ti-lmu-backlight",
 108                 .id            = LM3633,
 109                 .of_compatible = "ti,lm3633-backlight",
 110         },
 111         {
 112                 .name          = "lm3633-leds",
 113                 .of_compatible = "ti,lm3633-leds",
 114         },
 115         /* Monitoring driver for open/short circuit detection */
 116         {
 117                 .name          = "ti-lmu-fault-monitor",
 118                 .id            = LM3633,
 119                 .of_compatible = "ti,lm3633-fault-monitor",
 120         },
 121 };
 122
 123 static struct mfd_cell lm3695_devices[] = {
 124         {
 125                 .name          = "ti-lmu-backlight",
 126                 .id            = LM3695,
 127                 .of_compatible = "ti,lm3695-backlight",
 128         },
 129 };
 130
 131 static struct mfd_cell lm3697_devices[] = {
 132         {
 133                 .name          = "ti-lmu-backlight",
 134                 .id            = LM3697,
 135                 .of_compatible = "ti,lm3697-backlight",
 136         },
 137         /* Monitoring driver for open/short circuit detection */
 138         {
 139                 .name          = "ti-lmu-fault-monitor",
 140                 .id            = LM3697,
 141                 .of_compatible = "ti,lm3697-fault-monitor",
 142         },
 143 };
 144
 145 #define TI_LMU_DATA(chip, max_reg)              \
 146 static const struct ti_lmu_data chip##_data =   \
 147 {                                               \
 148         .cells = chip##_devices,                \
 149         .num_cells = ARRAY_SIZE(chip##_devices),\
 150         .max_register = max_reg,                \
 151 }                                               \
 152
 153 TI_LMU_DATA(lm3532, LM3532_MAX_REG);
 154 TI_LMU_DATA(lm3631, LM3631_MAX_REG);
 155 TI_LMU_DATA(lm3632, LM3632_MAX_REG);
 156 TI_LMU_DATA(lm3633, LM3633_MAX_REG);
 157 TI_LMU_DATA(lm3695, LM3695_MAX_REG);
 158 TI_LMU_DATA(lm3697, LM3697_MAX_REG);
 159
 160 static const struct of_device_id ti_lmu_of_match[] = {
 161         { .compatible = "ti,lm3532", .data = &lm3532_data },
 162         { .compatible = "ti,lm3631", .data = &lm3631_data },
 163         { .compatible = "ti,lm3632", .data = &lm3632_data },
 164         { .compatible = "ti,lm3633", .data = &lm3633_data },
 165         { .compatible = "ti,lm3695", .data = &lm3695_data },
 166         { .compatible = "ti,lm3697", .data = &lm3697_data },
 167         { }
 168 };
 169 MODULE_DEVICE_TABLE(of, ti_lmu_of_match);
 170
 171 static int ti_lmu_probe(struct i2c_client *cl, const struct i2c_device_id *id)
 172 {
 173         struct device *dev = &cl->dev;
 174         const struct of_device_id *match;
 175         const struct ti_lmu_data *data;
 176         struct regmap_config regmap_cfg;
 177         struct ti_lmu *lmu;
 178         int ret;
 179
 180         match = of_match_device(ti_lmu_of_match, dev);
 181         if (!match)
 182                 return -ENODEV;
 183         /*
 184          * Get device specific data from of_match table.
 185          * This data is defined by using TI_LMU_DATA() macro.
 186          */
 187         data = (struct ti_lmu_data *)match->data;
 188
 189         lmu = devm_kzalloc(dev, sizeof(*lmu), GFP_KERNEL);
 190         if (!lmu)
 191                 return -ENOMEM;
 192
 193         lmu->dev = &cl->dev;
 194
 195         /* Setup regmap */
 196         memset(&regmap_cfg, 0, sizeof(struct regmap_config));
 197         regmap_cfg.reg_bits = 8;
 198         regmap_cfg.val_bits = 8;
 199         regmap_cfg.name = id->name;
 200         regmap_cfg.max_register = data->max_register;
 201
 202         lmu->regmap = devm_regmap_init_i2c(cl, &regmap_cfg);
 203         if (IS_ERR(lmu->regmap))
 204                 return PTR_ERR(lmu->regmap);
 205
 206         /* HW enable pin control and additional power up sequence if required */
 207         lmu->en_gpio = of_get_named_gpio(dev->of_node, "enable-gpios", 0);
 208         ret = ti_lmu_enable_hw(lmu, id->driver_data);
 209         if (ret)
 210                 return ret;
 211
 212         /*
 213          * Fault circuit(open/short) can be detected by ti-lmu-fault-monitor.
 214          * After fault detection is done, some devices should re-initialize
 215          * configuration. The notifier enables such kind of handling.
 216          */
 217         BLOCKING_INIT_NOTIFIER_HEAD(&lmu->notifier);
 218
 219         i2c_set_clientdata(cl, lmu);
 220
 221         return mfd_add_devices(lmu->dev, 0, data->cells,
 222                                data->num_cells, NULL, 0, NULL);
 223 }
 224
 225 static int ti_lmu_remove(struct i2c_client *cl)
 226 {
 227         struct ti_lmu *lmu = i2c_get_clientdata(cl);
 228
 229         ti_lmu_disable_hw(lmu);
 230         mfd_remove_devices(lmu->dev);
 231         return 0;
 232 }
 233
 234 static const struct i2c_device_id ti_lmu_ids[] = {
 235         { "lm3532", LM3532 },
 236         { "lm3631", LM3631 },
 237         { "lm3632", LM3632 },
 238         { "lm3633", LM3633 },
 239         { "lm3695", LM3695 },
 240         { "lm3697", LM3697 },
 241         { }
 242 };
 243 MODULE_DEVICE_TABLE(i2c, ti_lmu_ids);
 244
 245 static struct i2c_driver ti_lmu_driver = {
 246         .probe = ti_lmu_probe,
 247         .remove = ti_lmu_remove,
 248         .driver = {
 249                 .name = "ti-lmu",
 250                 .of_match_table = ti_lmu_of_match,
 251         },
 252         .id_table = ti_lmu_ids,
 253 };
 254
 255 module_i2c_driver(ti_lmu_driver);
 256
 257 MODULE_DESCRIPTION("TI LMU MFD Core Driver");
 258 MODULE_AUTHOR("Milo Kim");
 259 MODULE_LICENSE("GPL v2");