Rajesh Bharathwaj | dcc7af8 | 2019-12-15 22:42:55 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2020, The Linux Foundation. All rights reserved. |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License version 2 and |
| 6 | * only version 2 as published by the Free Software Foundation. |
| 7 | * |
| 8 | * This program is distributed in the hope that it will be useful, |
| 9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 11 | * GNU General Public License for more details. |
| 12 | * |
| 13 | */ |
| 14 | |
| 15 | #include <linux/device.h> |
| 16 | #include <linux/i2c.h> |
| 17 | #include <linux/slab.h> |
| 18 | #include <linux/platform_device.h> |
| 19 | #include <linux/input.h> |
| 20 | #include <linux/types.h> |
| 21 | #include <linux/module.h> |
| 22 | #include <linux/fs.h> |
| 23 | #include <linux/kernel.h> |
| 24 | #include <linux/gpio.h> |
| 25 | #include <linux/delay.h> |
| 26 | |
| 27 | struct tusb1064 { |
| 28 | struct device *dev; |
| 29 | struct device_node *host_node; |
| 30 | u8 i2c_addr; |
| 31 | u32 dp_3v3_en; |
| 32 | struct i2c_client *i2c_client; |
| 33 | bool power_on; |
| 34 | }; |
| 35 | |
| 36 | static struct tusb1064 *pdata; |
Rajesh Bharathwaj | 00b57ac | 2020-03-24 23:16:35 -0700 | [diff] [blame^] | 37 | static bool standalone_mode; |
Rajesh Bharathwaj | dcc7af8 | 2019-12-15 22:42:55 -0800 | [diff] [blame] | 38 | |
| 39 | static int tusb1064_read(struct i2c_client *client, u8 reg, char *buf, u32 size) |
| 40 | { |
| 41 | struct i2c_msg msg[2] = { |
| 42 | { |
| 43 | .addr = client->addr, |
| 44 | .flags = 0, |
| 45 | .len = 1, |
| 46 | .buf = ®, |
| 47 | }, |
| 48 | { |
| 49 | .addr = client->addr, |
| 50 | .flags = I2C_M_RD, |
| 51 | .len = size, |
| 52 | .buf = buf, |
| 53 | } |
| 54 | }; |
| 55 | |
| 56 | if (i2c_transfer(client->adapter, msg, 2) != 2) { |
| 57 | pr_err("%s i2c read failed\n", __func__); |
| 58 | return -EIO; |
| 59 | } |
| 60 | pr_debug("%s, reg:%x buf[0]:%x\n", __func__, reg, buf[0]); |
| 61 | |
| 62 | return 0; |
| 63 | } |
| 64 | |
| 65 | static int tusb1064_write(struct i2c_client *client, u8 reg, u8 val) |
| 66 | { |
| 67 | u8 buf[2] = {reg, val}; |
| 68 | struct i2c_msg msg = { |
| 69 | .addr = client->addr, |
| 70 | .flags = 0, |
| 71 | .len = 2, |
| 72 | .buf = buf, |
| 73 | }; |
| 74 | |
| 75 | pr_debug("%s, reg:%x, val:%x\n", __func__, reg, val); |
| 76 | if (i2c_transfer(client->adapter, &msg, 1) < 1) { |
| 77 | pr_err("i2c write failed\n"); |
| 78 | return -EIO; |
| 79 | } |
| 80 | return 0; |
| 81 | } |
| 82 | |
| 83 | void tusb1064_flip(bool flip) |
| 84 | { |
| 85 | if (pdata) { |
| 86 | if (flip) { |
| 87 | pr_debug("%s flipping the switch\n", __func__); |
| 88 | /*AUXn->SBU2, AUXp->SBU1*/ |
| 89 | tusb1064_write(pdata->i2c_client, 0x13, 0x2F); |
| 90 | } else { |
| 91 | pr_debug("%s not flipping the switch\n", __func__); |
| 92 | /*AUXn->SBU2, AUXp->SBU1*/ |
| 93 | tusb1064_write(pdata->i2c_client, 0x13, 0x1F); |
| 94 | } |
| 95 | } |
| 96 | } |
| 97 | EXPORT_SYMBOL(tusb1064_flip); |
| 98 | |
| 99 | static int tusb1064_probe(struct i2c_client *client, |
| 100 | const struct i2c_device_id *id) |
| 101 | { |
| 102 | char buf[2]; |
| 103 | |
| 104 | if (!client || !client->dev.of_node) { |
| 105 | pr_err("%s invalid input\n", __func__); |
| 106 | return -EINVAL; |
| 107 | } |
| 108 | |
| 109 | if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) { |
| 110 | pr_err("%s device doesn't support I2C\n", __func__); |
| 111 | return -ENODEV; |
| 112 | } |
| 113 | |
| 114 | pdata = devm_kzalloc(&client->dev, |
| 115 | sizeof(struct tusb1064), GFP_KERNEL); |
| 116 | if (!pdata) |
| 117 | return -ENOMEM; |
| 118 | |
| 119 | pdata->dev = &client->dev; |
| 120 | pdata->i2c_client = client; |
| 121 | pr_debug("%s I2C address is %x\n", __func__, client->addr); |
| 122 | |
| 123 | i2c_set_clientdata(client, pdata); |
| 124 | dev_set_drvdata(&client->dev, pdata); |
| 125 | |
| 126 | tusb1064_read(pdata->i2c_client, 0x0A, buf, 2); |
| 127 | tusb1064_read(pdata->i2c_client, 0x13, buf, 2); |
| 128 | /*Enable 4-lane DP with FLip and enable EQ_OVERRIDe*/ |
| 129 | /*tusb1064_write(pdata, 0x0A, 0x13); */ |
| 130 | /*written usb sideEnable 4-lane DP with FLip and enable EQ_OVERRIDe */ |
| 131 | /*tusb1064_write(pdata, 0x0A, 0x12); */ |
| 132 | |
Rajesh Bharathwaj | 00b57ac | 2020-03-24 23:16:35 -0700 | [diff] [blame^] | 133 | if (standalone_mode) { |
| 134 | /*Enable 3.1 USB, no DP */ |
| 135 | if (tusb1064_write(pdata->i2c_client, 0x0A, 0x01) < 0) |
| 136 | goto fail; |
| 137 | } else { |
| 138 | /*Enable 4-lane DP with Flip and enable EQ_OVERRIDe */ |
| 139 | if (tusb1064_write(pdata->i2c_client, 0x0A, 0x02) < 0) |
| 140 | goto fail; |
Rajesh Bharathwaj | dcc7af8 | 2019-12-15 22:42:55 -0800 | [diff] [blame] | 141 | |
Rajesh Bharathwaj | 00b57ac | 2020-03-24 23:16:35 -0700 | [diff] [blame^] | 142 | pr_debug("%s setting SBU1 to AUXN, SBU2 to AUXP\n", __func__); |
| 143 | /*AUXn->SBU2, AUXp->SBU1 */ |
| 144 | if (tusb1064_write(pdata->i2c_client, 0x13, 0x1F) < 0) |
| 145 | goto fail; |
| 146 | //tusb1064_write(pdata, 0x13, 0x01);//AUXn->SBU1, AUXp->SBU2 |
Rajesh Bharathwaj | dcc7af8 | 2019-12-15 22:42:55 -0800 | [diff] [blame] | 147 | |
Rajesh Bharathwaj | 00b57ac | 2020-03-24 23:16:35 -0700 | [diff] [blame^] | 148 | /*Enable 4-lane DP */ |
| 149 | if (tusb1064_write(pdata->i2c_client, 0x10, 0x55) < 0) |
| 150 | goto fail; |
| 151 | /*Enable 4-lane DP */ |
| 152 | if (tusb1064_write(pdata->i2c_client, 0x11, 0x55) < 0) |
| 153 | goto fail; |
| 154 | //pr_err("setting SBU1 to AUXp and SBU2 to AUXN\n"); |
| 155 | //tusb1064_write(pdata, 0x13, 0x8F);//Enable 4-lane DP |
| 156 | } |
Rajesh Bharathwaj | dcc7af8 | 2019-12-15 22:42:55 -0800 | [diff] [blame] | 157 | tusb1064_read(pdata->i2c_client, 0x0A, buf, 2); |
| 158 | tusb1064_read(pdata->i2c_client, 0x13, buf, 2); |
| 159 | tusb1064_read(pdata->i2c_client, 0x10, buf, 2); |
| 160 | tusb1064_read(pdata->i2c_client, 0x11, buf, 2); |
| 161 | |
| 162 | pr_debug("%s probe successfully\n", __func__); |
| 163 | return 0; |
| 164 | fail: |
| 165 | devm_kfree(&client->dev, pdata); |
| 166 | return -EINVAL; |
| 167 | } |
| 168 | |
| 169 | static int tusb1064_remove(struct i2c_client *client) |
| 170 | { |
| 171 | struct tusb1064 *pdata = i2c_get_clientdata(client); |
| 172 | |
| 173 | if (pdata) |
| 174 | devm_kfree(&client->dev, pdata); |
| 175 | return 0; |
| 176 | } |
| 177 | |
| 178 | static void tusb1064_shutdown(struct i2c_client *client) |
| 179 | { |
| 180 | dev_info(&(client->dev), "shutdown"); |
| 181 | } |
| 182 | |
| 183 | static int tusb1064_suspend(struct device *dev, pm_message_t state) |
| 184 | { |
| 185 | dev_info(dev, "suspend"); |
| 186 | return 0; |
| 187 | } |
| 188 | |
| 189 | static int tusb1064_resume(struct device *dev) |
| 190 | { |
| 191 | dev_info(dev, "resume"); |
| 192 | return 0; |
| 193 | } |
| 194 | |
| 195 | static const struct i2c_device_id tusb1064_id_table[] = { |
| 196 | {"tusb1064", 0}, |
| 197 | {} |
| 198 | }; |
| 199 | |
| 200 | static struct i2c_driver tusb1064_i2c_driver = { |
| 201 | .probe = tusb1064_probe, |
| 202 | .remove = tusb1064_remove, |
| 203 | .shutdown = tusb1064_shutdown, |
| 204 | .driver = { |
| 205 | .name = "tusb1064", |
| 206 | .owner = THIS_MODULE, |
| 207 | .suspend = tusb1064_suspend, |
| 208 | .resume = tusb1064_resume, |
| 209 | }, |
| 210 | .id_table = tusb1064_id_table, |
| 211 | }; |
Rajesh Bharathwaj | 00b57ac | 2020-03-24 23:16:35 -0700 | [diff] [blame^] | 212 | |
| 213 | static int __init tusb1064_init(void) |
| 214 | { |
| 215 | char *cmdline; |
| 216 | |
| 217 | cmdline = strnstr(boot_command_line, |
| 218 | "msm_drm.dsi_display0=dsi_sim_vid_display", |
| 219 | strlen(boot_command_line)); |
| 220 | if (cmdline) { |
| 221 | pr_debug("%s tethered mode cmdline:%s\n", |
| 222 | __func__, cmdline); |
| 223 | standalone_mode = false; |
| 224 | } else { |
| 225 | pr_debug("%s standalone mode cmdline:%s\n", |
| 226 | __func__, cmdline); |
| 227 | standalone_mode = true; |
| 228 | } |
| 229 | |
| 230 | return 0; |
| 231 | } |
| 232 | |
| 233 | device_initcall(tusb1064_init); |
Rajesh Bharathwaj | dcc7af8 | 2019-12-15 22:42:55 -0800 | [diff] [blame] | 234 | module_i2c_driver(tusb1064_i2c_driver); |
| 235 | MODULE_DEVICE_TABLE(i2c, tusb1064_id_table); |
| 236 | MODULE_DESCRIPTION("TUSB1064 USB Bridge"); |