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/module.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 int ret; 50 unsigned int otpid; 51 52 lp87565 = devm_kzalloc(&client->dev, sizeof(*lp87565), GFP_KERNEL); 53 if (!lp87565) 54 return -ENOMEM; 55 56 lp87565->dev = &client->dev; 57 58 lp87565->regmap = devm_regmap_init_i2c(client, &lp87565_regmap_config); 59 if (IS_ERR(lp87565->regmap)) { 60 ret = PTR_ERR(lp87565->regmap); 61 dev_err(lp87565->dev, 62 "Failed to initialize register map: %d\n", ret); 63 return ret; 64 } 65 66 lp87565->reset_gpio = devm_gpiod_get_optional(lp87565->dev, "reset", 67 GPIOD_OUT_LOW); 68 if (IS_ERR(lp87565->reset_gpio)) { 69 ret = PTR_ERR(lp87565->reset_gpio); 70 if (ret == -EPROBE_DEFER) 71 return ret; 72 } 73 74 if (lp87565->reset_gpio) { 75 gpiod_set_value_cansleep(lp87565->reset_gpio, 1); 76 /* The minimum assertion time is undocumented, just guess */ 77 usleep_range(2000, 4000); 78 79 gpiod_set_value_cansleep(lp87565->reset_gpio, 0); 80 /* Min 1.2 ms before first I2C transaction */ 81 usleep_range(1500, 3000); 82 } 83 84 ret = regmap_read(lp87565->regmap, LP87565_REG_OTP_REV, &otpid); 85 if (ret) { 86 dev_err(lp87565->dev, "Failed to read OTP ID\n"); 87 return ret; 88 } 89 90 lp87565->rev = otpid & LP87565_OTP_REV_OTP_ID; 91 lp87565->dev_type = (uintptr_t)i2c_get_match_data(client); 92 93 i2c_set_clientdata(client, lp87565); 94 95 return devm_mfd_add_devices(lp87565->dev, PLATFORM_DEVID_AUTO, 96 lp87565_cells, ARRAY_SIZE(lp87565_cells), 97 NULL, 0, NULL); 98 } 99 100 static void lp87565_shutdown(struct i2c_client *client) 101 { 102 struct lp87565 *lp87565 = i2c_get_clientdata(client); 103 104 gpiod_set_value_cansleep(lp87565->reset_gpio, 1); 105 } 106 107 static const struct i2c_device_id lp87565_id_table[] = { 108 { "lp87565-q1" }, 109 { } 110 }; 111 MODULE_DEVICE_TABLE(i2c, lp87565_id_table); 112 113 static struct i2c_driver lp87565_driver = { 114 .driver = { 115 .name = "lp87565", 116 .of_match_table = of_lp87565_match_table, 117 }, 118 .probe = lp87565_probe, 119 .shutdown = lp87565_shutdown, 120 .id_table = lp87565_id_table, 121 }; 122 module_i2c_driver(lp87565_driver); 123 124 MODULE_AUTHOR("J Keerthy <j-keerthy@ti.com>"); 125 MODULE_DESCRIPTION("lp87565 chip family Multi-Function Device driver"); 126 MODULE_LICENSE("GPL v2"); 127