Rajesh Bharathwaj | d98f4be | 2020-01-27 15:54:03 -0800 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0-only |
| 2 | |
| 3 | /* |
Rajesh Bharathwaj | e07f300 | 2021-04-27 11:54:03 -0700 | [diff] [blame] | 4 | * Copyright (c) 2020-2021, The Linux Foundation. All rights reserved. |
Rajesh Bharathwaj | d98f4be | 2020-01-27 15:54:03 -0800 | [diff] [blame] | 5 | */ |
| 6 | |
| 7 | #include <linux/device.h> |
| 8 | #include <linux/i2c.h> |
| 9 | #include <linux/slab.h> |
| 10 | #include <linux/platform_device.h> |
| 11 | #include <linux/input.h> |
| 12 | #include <linux/types.h> |
| 13 | #include <linux/module.h> |
| 14 | #include <linux/fs.h> |
| 15 | #include <linux/of.h> |
| 16 | #include <linux/of_graph.h> |
| 17 | #include <linux/kernel.h> |
| 18 | #include <linux/of_gpio.h> |
| 19 | #include <linux/gpio.h> |
| 20 | #include <linux/delay.h> |
| 21 | #include <linux/regulator/consumer.h> |
| 22 | #include <linux/rwlock.h> |
| 23 | #include <linux/uaccess.h> |
| 24 | #include <linux/regmap.h> |
| 25 | |
| 26 | struct max31760 { |
| 27 | struct device *dev; |
| 28 | u8 i2c_addr; |
| 29 | struct regmap *regmap; |
| 30 | u32 fan_pwr_en; |
| 31 | u32 fan_pwr_bp; |
| 32 | struct i2c_client *i2c_client; |
| 33 | int pwm; |
| 34 | bool fan_off; |
| 35 | }; |
| 36 | |
| 37 | static void turn_gpio(struct max31760 *pdata, bool on) |
| 38 | { |
| 39 | if (on) { |
| 40 | gpio_direction_output(pdata->fan_pwr_en, 0); |
| 41 | gpio_set_value(pdata->fan_pwr_en, 1); |
| 42 | pr_debug("%s gpio:%d set to high\n", __func__, |
| 43 | pdata->fan_pwr_en); |
| 44 | msleep(20); |
| 45 | gpio_direction_output(pdata->fan_pwr_bp, 0); |
| 46 | gpio_set_value(pdata->fan_pwr_bp, 1); |
| 47 | pr_debug("%s gpio:%d set to high\n", __func__, |
| 48 | pdata->fan_pwr_bp); |
| 49 | msleep(20); |
| 50 | } else { |
| 51 | gpio_direction_output(pdata->fan_pwr_en, 1); |
| 52 | gpio_set_value(pdata->fan_pwr_en, 0); |
| 53 | pr_debug("%s gpio:%d set to low\n", __func__, |
| 54 | pdata->fan_pwr_en); |
| 55 | msleep(20); |
| 56 | gpio_direction_output(pdata->fan_pwr_bp, 1); |
| 57 | gpio_set_value(pdata->fan_pwr_bp, 0); |
| 58 | pr_debug("%s gpio:%d set to low\n", __func__, |
| 59 | pdata->fan_pwr_bp); |
| 60 | msleep(20); |
| 61 | } |
| 62 | } |
| 63 | |
| 64 | static int max31760_i2c_reg_get(struct max31760 *pdata, |
| 65 | u8 reg) |
| 66 | { |
| 67 | int ret; |
| 68 | u32 val1; |
| 69 | |
| 70 | pr_debug("%s, reg:%x\n", __func__, reg); |
| 71 | ret = regmap_read(pdata->regmap, (unsigned int)reg, &val1); |
| 72 | if (ret < 0) { |
| 73 | pr_err("%s failed reading reg 0x%02x failure\n", __func__, reg); |
| 74 | return ret; |
| 75 | } |
| 76 | |
| 77 | pr_debug("%s success reading reg 0x%x=0x%x, val1=%x\n", |
| 78 | __func__, reg, val1, val1); |
| 79 | |
| 80 | return 0; |
| 81 | } |
| 82 | |
| 83 | static int max31760_i2c_reg_set(struct max31760 *pdata, |
| 84 | u8 reg, u8 val) |
| 85 | { |
| 86 | int ret; |
| 87 | int i; |
| 88 | |
| 89 | for (i = 0; i < 10; i++) { |
| 90 | ret = regmap_write(pdata->regmap, reg, val); |
| 91 | if (ret >= 0) |
| 92 | return ret; |
| 93 | msleep(20); |
| 94 | } |
| 95 | if (ret < 0) |
| 96 | pr_err("%s loop:%d failed to write reg 0x%02x=0x%02x\n", |
| 97 | __func__, i, reg, val); |
| 98 | return ret; |
| 99 | } |
| 100 | |
| 101 | static ssize_t fan_show(struct device *dev, struct device_attribute *attr, |
| 102 | char *buf) |
| 103 | { |
| 104 | struct max31760 *pdata; |
| 105 | int ret; |
| 106 | |
| 107 | pdata = dev_get_drvdata(dev); |
| 108 | if (!pdata) { |
| 109 | pr_err("invalid driver pointer\n"); |
| 110 | return -ENODEV; |
| 111 | } |
| 112 | |
| 113 | if (pdata->fan_off) |
| 114 | ret = scnprintf(buf, PAGE_SIZE, "off\n"); |
| 115 | else |
| 116 | ret = scnprintf(buf, PAGE_SIZE, "0x%x\n", pdata->pwm); |
| 117 | |
| 118 | return ret; |
| 119 | } |
| 120 | |
| 121 | static ssize_t fan_store(struct device *dev, struct device_attribute *attr, |
| 122 | const char *buf, size_t count) |
| 123 | { |
Rajesh Bharathwaj | e07f300 | 2021-04-27 11:54:03 -0700 | [diff] [blame] | 124 | long val, val1; |
Rajesh Bharathwaj | d98f4be | 2020-01-27 15:54:03 -0800 | [diff] [blame] | 125 | struct max31760 *pdata; |
| 126 | |
| 127 | pdata = dev_get_drvdata(dev); |
| 128 | if (!pdata) { |
| 129 | pr_err("invalid driver pointer\n"); |
| 130 | return -ENODEV; |
| 131 | } |
| 132 | |
| 133 | kstrtol(buf, 0, &val); |
Rajesh Bharathwaj | e07f300 | 2021-04-27 11:54:03 -0700 | [diff] [blame] | 134 | val1 = val >> 8; |
| 135 | pr_debug("%s, count:%d val:%lx, val1:%lx, buf:%s\n", |
| 136 | __func__, count, val, val1, buf); |
| 137 | if (val1 == 0x50) { |
| 138 | val1 = val & 0xFF; |
| 139 | pr_debug("%s, reg value val1:%lx\n", __func__, val1); |
| 140 | max31760_i2c_reg_set(pdata, 0x50, val1); |
| 141 | return count; |
| 142 | } |
Rajesh Bharathwaj | d98f4be | 2020-01-27 15:54:03 -0800 | [diff] [blame] | 143 | |
| 144 | if (val == 0xff) { |
| 145 | turn_gpio(pdata, false); |
| 146 | pdata->fan_off = true; |
| 147 | } else if (val == 0xfe) { |
| 148 | pdata->fan_off = false; |
| 149 | turn_gpio(pdata, true); |
| 150 | max31760_i2c_reg_set(pdata, 0x00, pdata->pwm); |
| 151 | } else { |
| 152 | max31760_i2c_reg_set(pdata, 0x00, (int)val); |
| 153 | pdata->pwm = (int)val; |
| 154 | } |
| 155 | |
| 156 | return count; |
| 157 | } |
| 158 | |
| 159 | static DEVICE_ATTR_RW(fan); |
| 160 | |
| 161 | static struct attribute *max31760_fs_attrs[] = { |
| 162 | &dev_attr_fan.attr, |
| 163 | NULL |
| 164 | }; |
| 165 | |
| 166 | static struct attribute_group max31760_fs_attr_group = { |
| 167 | .attrs = max31760_fs_attrs, |
| 168 | }; |
| 169 | |
| 170 | static int max31760_parse_dt(struct device *dev, |
| 171 | struct max31760 *pdata) |
| 172 | { |
| 173 | struct device_node *np = dev->of_node; |
| 174 | int ret; |
| 175 | |
| 176 | pdata->fan_pwr_en = |
| 177 | of_get_named_gpio(np, "qcom,fan-pwr-en", 0); |
| 178 | if (!gpio_is_valid(pdata->fan_pwr_en)) { |
| 179 | pr_err("%s fan_pwr_en gpio not specified\n", __func__); |
| 180 | ret = -EINVAL; |
| 181 | } else { |
| 182 | ret = gpio_request(pdata->fan_pwr_en, "fan_pwr_en"); |
| 183 | if (ret) { |
| 184 | pr_err("max31760 fan_pwr_en gpio request failed\n"); |
| 185 | goto error1; |
| 186 | } |
| 187 | } |
| 188 | |
| 189 | pdata->fan_pwr_bp = |
| 190 | of_get_named_gpio(np, "qcom,fan-pwr-bp", 0); |
| 191 | if (!gpio_is_valid(pdata->fan_pwr_bp)) { |
| 192 | pr_err("%s fan_pwr_bp gpio not specified\n", __func__); |
| 193 | ret = -EINVAL; |
| 194 | } else |
| 195 | ret = gpio_request(pdata->fan_pwr_bp, "fan_pwr_bp"); |
| 196 | if (ret) { |
| 197 | pr_err("max31760 fan_pwr_bp gpio request failed\n"); |
| 198 | goto error2; |
| 199 | } |
| 200 | turn_gpio(pdata, true); |
| 201 | |
| 202 | return ret; |
| 203 | |
| 204 | error2: |
| 205 | gpio_free(pdata->fan_pwr_bp); |
| 206 | error1: |
| 207 | gpio_free(pdata->fan_pwr_en); |
| 208 | return ret; |
| 209 | } |
| 210 | |
| 211 | static int max31760_fan_pwr_enable_vregs(struct device *dev, |
| 212 | struct max31760 *pdata) |
| 213 | { |
| 214 | int ret; |
| 215 | struct regulator *reg; |
| 216 | |
| 217 | /* Fan Control LDO L10A */ |
| 218 | reg = devm_regulator_get(dev, "pm8150_l10"); |
| 219 | if (!IS_ERR(reg)) { |
| 220 | regulator_set_load(reg, 600000); |
| 221 | ret = regulator_enable(reg); |
| 222 | if (ret < 0) { |
| 223 | pr_err("%s pm8150_l10 failed\n", __func__); |
| 224 | return -EINVAL; |
| 225 | } |
| 226 | } |
| 227 | |
| 228 | /* Fan Control LDO S4 */ |
| 229 | reg = devm_regulator_get(dev, "pm8150_s4"); |
| 230 | if (!IS_ERR(reg)) { |
| 231 | regulator_set_load(reg, 600000); |
| 232 | ret = regulator_enable(reg); |
| 233 | if (ret < 0) { |
| 234 | pr_err("%s pm8150_s4 failed\n", __func__); |
| 235 | return -EINVAL; |
| 236 | } |
| 237 | } |
| 238 | |
| 239 | return ret; |
| 240 | } |
| 241 | |
| 242 | static const struct regmap_config max31760_regmap = { |
| 243 | .reg_bits = 8, |
| 244 | .val_bits = 8, |
| 245 | .max_register = 0xFF, |
| 246 | }; |
| 247 | |
| 248 | static int max31760_probe(struct i2c_client *client, |
| 249 | const struct i2c_device_id *id) |
| 250 | { |
| 251 | int ret; |
| 252 | struct max31760 *pdata; |
| 253 | |
| 254 | if (!client || !client->dev.of_node) { |
| 255 | pr_err("%s invalid input\n", __func__); |
| 256 | return -EINVAL; |
| 257 | } |
| 258 | |
| 259 | if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) { |
| 260 | pr_err("%s device doesn't support I2C\n", __func__); |
| 261 | return -ENODEV; |
| 262 | } |
| 263 | |
| 264 | pdata = devm_kzalloc(&client->dev, |
| 265 | sizeof(struct max31760), GFP_KERNEL); |
| 266 | if (!pdata) |
| 267 | return -ENOMEM; |
| 268 | |
| 269 | pdata->regmap = devm_regmap_init_i2c(client, &max31760_regmap); |
| 270 | if (IS_ERR(pdata->regmap)) { |
| 271 | ret = PTR_ERR(pdata->regmap); |
| 272 | pr_err("%s Failed to allocate regmap: %d\n", __func__, ret); |
| 273 | return -EINVAL; |
| 274 | } |
| 275 | |
| 276 | ret = max31760_parse_dt(&client->dev, pdata); |
| 277 | if (ret) { |
| 278 | pr_err("%s failed to parse device tree\n", __func__); |
| 279 | return -EINVAL; |
| 280 | } |
| 281 | |
| 282 | ret = max31760_fan_pwr_enable_vregs(&client->dev, pdata); |
| 283 | if (ret) { |
| 284 | pr_err("%s failed to pwr regulators\n", __func__); |
| 285 | return -EINVAL; |
| 286 | } |
| 287 | |
| 288 | pdata->dev = &client->dev; |
| 289 | i2c_set_clientdata(client, pdata); |
| 290 | |
| 291 | pdata->i2c_client = client; |
| 292 | |
| 293 | dev_set_drvdata(&client->dev, pdata); |
| 294 | |
| 295 | ret = sysfs_create_group(&pdata->dev->kobj, &max31760_fs_attr_group); |
| 296 | if (ret) |
| 297 | pr_err("%s unable to register max31760 sysfs nodes\n"); |
| 298 | |
| 299 | /* 00 - 0x01 -- 33Hz */ |
| 300 | /* 01 - 0x09 -- 150Hz */ |
| 301 | /* 10 - 0x11 -- 1500Hz */ |
| 302 | /* 11 - 0x19 -- 25Khz */ |
| 303 | pdata->pwm = 0x19; |
| 304 | max31760_i2c_reg_set(pdata, 0x00, pdata->pwm); |
| 305 | max31760_i2c_reg_set(pdata, 0x01, 0x11); |
| 306 | max31760_i2c_reg_set(pdata, 0x02, 0x31); |
| 307 | max31760_i2c_reg_set(pdata, 0x03, 0x45); |
| 308 | max31760_i2c_reg_set(pdata, 0x04, 0xff); |
| 309 | max31760_i2c_reg_set(pdata, 0x50, 0xcf); |
| 310 | max31760_i2c_reg_set(pdata, 0x01, 0x11); |
| 311 | max31760_i2c_reg_set(pdata, 0x00, pdata->pwm); |
| 312 | max31760_i2c_reg_get(pdata, 0x00); |
| 313 | |
| 314 | return ret; |
| 315 | } |
| 316 | |
| 317 | static int max31760_remove(struct i2c_client *client) |
| 318 | { |
| 319 | struct max31760 *pdata = i2c_get_clientdata(client); |
| 320 | |
| 321 | if (!pdata) |
| 322 | goto end; |
| 323 | |
| 324 | sysfs_remove_group(&pdata->dev->kobj, &max31760_fs_attr_group); |
| 325 | turn_gpio(pdata, false); |
| 326 | end: |
| 327 | return 0; |
| 328 | } |
| 329 | |
| 330 | |
| 331 | static void max31760_shutdown(struct i2c_client *client) |
| 332 | { |
| 333 | } |
| 334 | |
| 335 | static int max31760_suspend(struct device *dev, pm_message_t state) |
| 336 | { |
| 337 | struct max31760 *pdata = dev_get_drvdata(dev); |
| 338 | |
| 339 | dev_dbg(dev, "suspend\n"); |
| 340 | if (pdata) |
| 341 | turn_gpio(pdata, false); |
| 342 | return 0; |
| 343 | } |
| 344 | |
| 345 | static int max31760_resume(struct device *dev) |
| 346 | { |
| 347 | struct max31760 *pdata = dev_get_drvdata(dev); |
| 348 | |
| 349 | dev_dbg(dev, "resume\n"); |
| 350 | if (pdata) { |
| 351 | turn_gpio(pdata, true); |
| 352 | max31760_i2c_reg_set(pdata, 0x00, pdata->pwm); |
| 353 | } |
| 354 | return 0; |
| 355 | } |
| 356 | |
| 357 | static const struct of_device_id max31760_id_table[] = { |
| 358 | { .compatible = "maxim,xrfancontroller",}, |
| 359 | { }, |
| 360 | }; |
| 361 | static const struct i2c_device_id max31760_i2c_table[] = { |
| 362 | { "xrfancontroller", 0 }, |
| 363 | { }, |
| 364 | }; |
| 365 | |
| 366 | static struct i2c_driver max31760_i2c_driver = { |
| 367 | .probe = max31760_probe, |
| 368 | .remove = max31760_remove, |
| 369 | .shutdown = max31760_shutdown, |
| 370 | .driver = { |
| 371 | .name = "maxim xrfancontroller", |
| 372 | .of_match_table = max31760_id_table, |
| 373 | .suspend = max31760_suspend, |
| 374 | .resume = max31760_resume, |
| 375 | }, |
| 376 | .id_table = max31760_i2c_table, |
| 377 | }; |
| 378 | module_i2c_driver(max31760_i2c_driver); |
| 379 | MODULE_DEVICE_TABLE(i2c, max31760_i2c_table); |
| 380 | MODULE_DESCRIPTION("Maxim 31760 Fan Controller"); |
| 381 | MODULE_LICENSE("GPL v2"); |