1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Copyright (c) 2015 Google, Inc 4 * Written by Simon Glass <sjg (at) chromium.org> 5 */ 6 7 #include <common.h> 8 #include <dm.h> 9 #include <cros_ec.h> 10 #include <errno.h> 11 #include <i2c.h> 12 #include <power/tps65090.h> 13 14 static int cros_ec_ldo_set_bus_speed(struct udevice *dev, unsigned int speed) 15 { 16 return 0; 17 } 18 19 static int cros_ec_ldo_xfer(struct udevice *dev, struct i2c_msg *msg, 20 int nmsgs) 21 { 22 bool is_read = nmsgs > 1; 23 int fet_id, ret; 24 25 /* 26 * Look for reads and writes of the LDO registers. In either case the 27 * first message is a write with the register number as the first byte. 28 */ 29 if (!nmsgs || !msg->len || (msg->flags & I2C_M_RD)) { 30 debug("%s: Invalid message\n", __func__); 31 goto err; 32 } 33 34 fet_id = msg->buf[0] - REG_FET_BASE; 35 if (fet_id < 1 || fet_id > MAX_FET_NUM) { 36 debug("%s: Invalid FET %d\n", __func__, fet_id); 37 goto err; 38 } 39 40 if (is_read) { 41 uint8_t state; 42 43 ret = cros_ec_get_ldo(dev->parent, fet_id, &state); 44 if (!ret) 45 msg[1].buf[0] = state ? 46 FET_CTRL_ENFET | FET_CTRL_PGFET : 0; 47 } else { 48 bool on = msg->buf[1] & FET_CTRL_ENFET; 49 50 ret = cros_ec_set_ldo(dev->parent, fet_id, on); 51 } 52 53 return ret; 54 55 err: 56 /* Indicate that the message is unimplemented */ 57 return -ENOSYS; 58 } 59 60 static const struct dm_i2c_ops cros_ec_i2c_ops = { 61 .xfer = cros_ec_ldo_xfer, 62 .set_bus_speed = cros_ec_ldo_set_bus_speed, 63 }; 64 65 static const struct udevice_id cros_ec_i2c_ids[] = { 66 { .compatible = "google,cros-ec-ldo-tunnel" }, 67 { } 68 }; 69 70 U_BOOT_DRIVER(cros_ec_ldo) = { 71 .name = "cros_ec_ldo_tunnel", 72 .id = UCLASS_I2C, 73 .of_match = cros_ec_i2c_ids, 74 .ops = &cros_ec_i2c_ops, 75 }; 76
