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/interrupt.h> 10 #include <linux/mfd/core.h> 11 #include <linux/module.h> 12 #include <linux/of_device.h> 13 #include <linux/regmap.h> 14 15 #include <linux/mfd/lp87565.h> 16 17 static const struct regmap_config lp87565_regmap_config = { 18 .reg_bits = 8, 19 .val_bits = 8, 20 .max_register = LP87565_REG_MAX, 21 }; 22 23 static const struct mfd_cell lp87565_cells[] = { 24 { .name = "lp87565-q1-regulator", }, 25 { .name = "lp87565-q1-gpio", }, 26 }; 27 28 static const struct of_device_id of_lp87565_match_table[] = { 29 { .compatible = "ti,lp87565", }, 30 { 31 .compatible = "ti,lp87524-q1", 32 .data = (void *)LP87565_DEVICE_TYPE_LP87524_Q1, 33 }, 34 { 35 .compatible = "ti,lp87565-q1", 36 .data = (void *)LP87565_DEVICE_TYPE_LP87565_Q1, 37 }, 38 { 39 .compatible = "ti,lp87561-q1", 40 .data = (void *)LP87565_DEVICE_TYPE_LP87561_Q1, 41 }, 42 {} 43 }; 44 MODULE_DEVICE_TABLE(of, of_lp87565_match_table); 45 46 static int lp87565_probe(struct i2c_client *client, 47 const struct i2c_device_id *ids) 48 { 49 struct lp87565 *lp87565; 50 const struct of_device_id *of_id; 51 int ret; 52 unsigned int otpid; 53 54 lp87565 = devm_kzalloc(&client->dev, sizeof(*lp87565), GFP_KERNEL); 55 if (!lp87565) 56 return -ENOMEM; 57 58 lp87565->dev = &client->dev; 59 60 lp87565->regmap = devm_regmap_init_i2c(client, &lp87565_regmap_config); 61 if (IS_ERR(lp87565->regmap)) { 62 ret = PTR_ERR(lp87565->regmap); 63 dev_err(lp87565->dev, 64 "Failed to initialize register map: %d\n", ret); 65 return ret; 66 } 67 68 lp87565->reset_gpio = devm_gpiod_get_optional(lp87565->dev, "reset", 69 GPIOD_OUT_LOW); 70 if (IS_ERR(lp87565->reset_gpio)) { 71 ret = PTR_ERR(lp87565->reset_gpio); 72 if (ret == -EPROBE_DEFER) 73 return ret; 74 } 75 76 if (lp87565->reset_gpio) { 77 gpiod_set_value_cansleep(lp87565->reset_gpio, 1); 78 /* The minimum assertion time is undocumented, just guess */ 79 usleep_range(2000, 4000); 80 81 gpiod_set_value_cansleep(lp87565->reset_gpio, 0); 82 /* Min 1.2 ms before first I2C transaction */ 83 usleep_range(1500, 3000); 84 } 85 86 ret = regmap_read(lp87565->regmap, LP87565_REG_OTP_REV, &otpid); 87 if (ret) { 88 dev_err(lp87565->dev, "Failed to read OTP ID\n"); 89 return ret; 90 } 91 92 lp87565->rev = otpid & LP87565_OTP_REV_OTP_ID; 93 94 of_id = of_match_device(of_lp87565_match_table, &client->dev); 95 if (of_id) 96 lp87565->dev_type = (enum lp87565_device_type)of_id->data; 97 98 i2c_set_clientdata(client, lp87565); 99 100 return devm_mfd_add_devices(lp87565->dev, PLATFORM_DEVID_AUTO, 101 lp87565_cells, ARRAY_SIZE(lp87565_cells), 102 NULL, 0, NULL); 103 } 104 105 static void lp87565_shutdown(struct i2c_client *client) 106 { 107 struct lp87565 *lp87565 = i2c_get_clientdata(client); 108 109 gpiod_set_value_cansleep(lp87565->reset_gpio, 1); 110 } 111 112 static const struct i2c_device_id lp87565_id_table[] = { 113 { "lp87565-q1", 0 }, 114 { }, 115 }; 116 MODULE_DEVICE_TABLE(i2c, lp87565_id_table); 117 118 static struct i2c_driver lp87565_driver = { 119 .driver = { 120 .name = "lp87565", 121 .of_match_table = of_lp87565_match_table, 122 }, 123 .probe = lp87565_probe, 124 .shutdown = lp87565_shutdown, 125 .id_table = lp87565_id_table, 126 }; 127 module_i2c_driver(lp87565_driver); 128 129 MODULE_AUTHOR("J Keerthy <j-keerthy@ti.com>"); 130 MODULE_DESCRIPTION("lp87565 chip family Multi-Function Device driver"); 131 MODULE_LICENSE("GPL v2"); 132