drivers/mfd/lp87565.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2017 Texas Instruments Incorporated - https://www.ti.com/
   4  *
   5  * Author: Keerthy <j-keerthy@ti.com>
   6  */
   7
   8 #include <linux/gpio/consumer.h>
   9 #include <linux/i2c.h>
  10 #include <linux/interrupt.h>
  11 #include <linux/mfd/core.h>
  12 #include <linux/mod_devicetable.h>
  13 #include <linux/module.h>
  14 #include <linux/regmap.h>
  15
  16 #include <linux/mfd/lp87565.h>
  17
  18 static const struct regmap_config lp87565_regmap_config = {
  19         .reg_bits = 8,
  20         .val_bits = 8,
  21         .max_register = LP87565_REG_MAX,
  22 };
  23
  24 static const struct mfd_cell lp87565_cells[] = {
  25         { .name = "lp87565-q1-regulator", },
  26         { .name = "lp87565-q1-gpio", },
  27 };
  28
  29 static const struct of_device_id of_lp87565_match_table[] = {
  30         { .compatible = "ti,lp87565", },
  31         {
  32                 .compatible = "ti,lp87524-q1",
  33                 .data = (void *)LP87565_DEVICE_TYPE_LP87524_Q1,
  34         },
  35         {
  36                 .compatible = "ti,lp87565-q1",
  37                 .data = (void *)LP87565_DEVICE_TYPE_LP87565_Q1,
  38         },
  39         {
  40                 .compatible = "ti,lp87561-q1",
  41                 .data = (void *)LP87565_DEVICE_TYPE_LP87561_Q1,
  42         },
  43         {}
  44 };
  45 MODULE_DEVICE_TABLE(of, of_lp87565_match_table);
  46
  47 static int lp87565_probe(struct i2c_client *client)
  48 {
  49         struct lp87565 *lp87565;
  50         int ret;
  51         unsigned int otpid;
  52
  53         lp87565 = devm_kzalloc(&client->dev, sizeof(*lp87565), GFP_KERNEL);
  54         if (!lp87565)
  55                 return -ENOMEM;
  56
  57         lp87565->dev = &client->dev;
  58
  59         lp87565->regmap = devm_regmap_init_i2c(client, &lp87565_regmap_config);
  60         if (IS_ERR(lp87565->regmap)) {
  61                 ret = PTR_ERR(lp87565->regmap);
  62                 dev_err(lp87565->dev,
  63                         "Failed to initialize register map: %d\n", ret);
  64                 return ret;
  65         }
  66
  67         lp87565->reset_gpio = devm_gpiod_get_optional(lp87565->dev, "reset",
  68                                                       GPIOD_OUT_LOW);
  69         if (IS_ERR(lp87565->reset_gpio)) {
  70                 ret = PTR_ERR(lp87565->reset_gpio);
  71                 if (ret == -EPROBE_DEFER)
  72                         return ret;
  73         }
  74
  75         if (lp87565->reset_gpio) {
  76                 gpiod_set_value_cansleep(lp87565->reset_gpio, 1);
  77                 /* The minimum assertion time is undocumented, just guess */
  78                 usleep_range(2000, 4000);
  79
  80                 gpiod_set_value_cansleep(lp87565->reset_gpio, 0);
  81                 /* Min 1.2 ms before first I2C transaction */
  82                 usleep_range(1500, 3000);
  83         }
  84
  85         ret = regmap_read(lp87565->regmap, LP87565_REG_OTP_REV, &otpid);
  86         if (ret) {
  87                 dev_err(lp87565->dev, "Failed to read OTP ID\n");
  88                 return ret;
  89         }
  90
  91         lp87565->rev = otpid & LP87565_OTP_REV_OTP_ID;
  92         lp87565->dev_type = (uintptr_t)i2c_get_match_data(client);
  93
  94         i2c_set_clientdata(client, lp87565);
  95
  96         return devm_mfd_add_devices(lp87565->dev, PLATFORM_DEVID_AUTO,
  97                                     lp87565_cells, ARRAY_SIZE(lp87565_cells),
  98                                     NULL, 0, NULL);
  99 }
 100
 101 static void lp87565_shutdown(struct i2c_client *client)
 102 {
 103         struct lp87565 *lp87565 = i2c_get_clientdata(client);
 104
 105         gpiod_set_value_cansleep(lp87565->reset_gpio, 1);
 106 }
 107
 108 static const struct i2c_device_id lp87565_id_table[] = {
 109         { "lp87565-q1" },
 110         { }
 111 };
 112 MODULE_DEVICE_TABLE(i2c, lp87565_id_table);
 113
 114 static struct i2c_driver lp87565_driver = {
 115         .driver = {
 116                 .name   = "lp87565",
 117                 .of_match_table = of_lp87565_match_table,
 118         },
 119         .probe = lp87565_probe,
 120         .shutdown = lp87565_shutdown,
 121         .id_table = lp87565_id_table,
 122 };
 123 module_i2c_driver(lp87565_driver);
 124
 125 MODULE_AUTHOR("J Keerthy <j-keerthy@ti.com>");
 126 MODULE_DESCRIPTION("lp87565 chip family Multi-Function Device driver");
 127 MODULE_LICENSE("GPL v2");