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 { 48 struct lp87565 *lp87565; 49 const struct of_device_id *of_id; 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 93 of_id = of_match_device(of_lp87565_match_table, &client->dev); 94 if (of_id) 95 lp87565->dev_type = (enum lp87565_device_type)of_id->data; 96 97 i2c_set_clientdata(client, lp87565); 98 99 return devm_mfd_add_devices(lp87565->dev, PLATFORM_DEVID_AUTO, 100 lp87565_cells, ARRAY_SIZE(lp87565_cells), 101 NULL, 0, NULL); 102 } 103 104 static void lp87565_shutdown(struct i2c_client *client) 105 { 106 struct lp87565 *lp87565 = i2c_get_clientdata(client); 107 108 gpiod_set_value_cansleep(lp87565->reset_gpio, 1); 109 } 110 111 static const struct i2c_device_id lp87565_id_table[] = { 112 { "lp87565-q1", 0 }, 113 { }, 114 }; 115 MODULE_DEVICE_TABLE(i2c, lp87565_id_table); 116 117 static struct i2c_driver lp87565_driver = { 118 .driver = { 119 .name = "lp87565", 120 .of_match_table = of_lp87565_match_table, 121 }, 122 .probe_new = lp87565_probe, 123 .shutdown = lp87565_shutdown, 124 .id_table = lp87565_id_table, 125 }; 126 module_i2c_driver(lp87565_driver); 127 128 MODULE_AUTHOR("J Keerthy <j-keerthy@ti.com>"); 129 MODULE_DESCRIPTION("lp87565 chip family Multi-Function Device driver"); 130 MODULE_LICENSE("GPL v2"); 131