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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * linux/drivers/mfd/aat2870-core.c4 *5 * Copyright (c) 2011, NVIDIA Corporation.6 * Author: Jin Park <jinyoungp@nvidia.com>7 */8 9#include <linux/kernel.h>10#include <linux/init.h>11#include <linux/debugfs.h>12#include <linux/slab.h>13#include <linux/uaccess.h>14#include <linux/i2c.h>15#include <linux/delay.h>16#include <linux/gpio.h>17#include <linux/mfd/core.h>18#include <linux/mfd/aat2870.h>19#include <linux/regulator/machine.h>20 21static struct aat2870_register aat2870_regs[AAT2870_REG_NUM] = {22 /* readable, writeable, value */23 { 0, 1, 0x00 }, /* 0x00 AAT2870_BL_CH_EN */24 { 0, 1, 0x16 }, /* 0x01 AAT2870_BLM */25 { 0, 1, 0x16 }, /* 0x02 AAT2870_BLS */26 { 0, 1, 0x56 }, /* 0x03 AAT2870_BL1 */27 { 0, 1, 0x56 }, /* 0x04 AAT2870_BL2 */28 { 0, 1, 0x56 }, /* 0x05 AAT2870_BL3 */29 { 0, 1, 0x56 }, /* 0x06 AAT2870_BL4 */30 { 0, 1, 0x56 }, /* 0x07 AAT2870_BL5 */31 { 0, 1, 0x56 }, /* 0x08 AAT2870_BL6 */32 { 0, 1, 0x56 }, /* 0x09 AAT2870_BL7 */33 { 0, 1, 0x56 }, /* 0x0A AAT2870_BL8 */34 { 0, 1, 0x00 }, /* 0x0B AAT2870_FLR */35 { 0, 1, 0x03 }, /* 0x0C AAT2870_FM */36 { 0, 1, 0x03 }, /* 0x0D AAT2870_FS */37 { 0, 1, 0x10 }, /* 0x0E AAT2870_ALS_CFG0 */38 { 0, 1, 0x06 }, /* 0x0F AAT2870_ALS_CFG1 */39 { 0, 1, 0x00 }, /* 0x10 AAT2870_ALS_CFG2 */40 { 1, 0, 0x00 }, /* 0x11 AAT2870_AMB */41 { 0, 1, 0x00 }, /* 0x12 AAT2870_ALS0 */42 { 0, 1, 0x00 }, /* 0x13 AAT2870_ALS1 */43 { 0, 1, 0x00 }, /* 0x14 AAT2870_ALS2 */44 { 0, 1, 0x00 }, /* 0x15 AAT2870_ALS3 */45 { 0, 1, 0x00 }, /* 0x16 AAT2870_ALS4 */46 { 0, 1, 0x00 }, /* 0x17 AAT2870_ALS5 */47 { 0, 1, 0x00 }, /* 0x18 AAT2870_ALS6 */48 { 0, 1, 0x00 }, /* 0x19 AAT2870_ALS7 */49 { 0, 1, 0x00 }, /* 0x1A AAT2870_ALS8 */50 { 0, 1, 0x00 }, /* 0x1B AAT2870_ALS9 */51 { 0, 1, 0x00 }, /* 0x1C AAT2870_ALSA */52 { 0, 1, 0x00 }, /* 0x1D AAT2870_ALSB */53 { 0, 1, 0x00 }, /* 0x1E AAT2870_ALSC */54 { 0, 1, 0x00 }, /* 0x1F AAT2870_ALSD */55 { 0, 1, 0x00 }, /* 0x20 AAT2870_ALSE */56 { 0, 1, 0x00 }, /* 0x21 AAT2870_ALSF */57 { 0, 1, 0x00 }, /* 0x22 AAT2870_SUB_SET */58 { 0, 1, 0x00 }, /* 0x23 AAT2870_SUB_CTRL */59 { 0, 1, 0x00 }, /* 0x24 AAT2870_LDO_AB */60 { 0, 1, 0x00 }, /* 0x25 AAT2870_LDO_CD */61 { 0, 1, 0x00 }, /* 0x26 AAT2870_LDO_EN */62};63 64static struct mfd_cell aat2870_devs[] = {65 {66 .name = "aat2870-backlight",67 .id = AAT2870_ID_BL,68 .pdata_size = sizeof(struct aat2870_bl_platform_data),69 },70 {71 .name = "aat2870-regulator",72 .id = AAT2870_ID_LDOA,73 .pdata_size = sizeof(struct regulator_init_data),74 },75 {76 .name = "aat2870-regulator",77 .id = AAT2870_ID_LDOB,78 .pdata_size = sizeof(struct regulator_init_data),79 },80 {81 .name = "aat2870-regulator",82 .id = AAT2870_ID_LDOC,83 .pdata_size = sizeof(struct regulator_init_data),84 },85 {86 .name = "aat2870-regulator",87 .id = AAT2870_ID_LDOD,88 .pdata_size = sizeof(struct regulator_init_data),89 },90};91 92static int __aat2870_read(struct aat2870_data *aat2870, u8 addr, u8 *val)93{94 int ret;95 96 if (addr >= AAT2870_REG_NUM) {97 dev_err(aat2870->dev, "Invalid address, 0x%02x\n", addr);98 return -EINVAL;99 }100 101 if (!aat2870->reg_cache[addr].readable) {102 *val = aat2870->reg_cache[addr].value;103 goto out;104 }105 106 ret = i2c_master_send(aat2870->client, &addr, 1);107 if (ret < 0)108 return ret;109 if (ret != 1)110 return -EIO;111 112 ret = i2c_master_recv(aat2870->client, val, 1);113 if (ret < 0)114 return ret;115 if (ret != 1)116 return -EIO;117 118out:119 dev_dbg(aat2870->dev, "read: addr=0x%02x, val=0x%02x\n", addr, *val);120 return 0;121}122 123static int __aat2870_write(struct aat2870_data *aat2870, u8 addr, u8 val)124{125 u8 msg[2];126 int ret;127 128 if (addr >= AAT2870_REG_NUM) {129 dev_err(aat2870->dev, "Invalid address, 0x%02x\n", addr);130 return -EINVAL;131 }132 133 if (!aat2870->reg_cache[addr].writeable) {134 dev_err(aat2870->dev, "Address 0x%02x is not writeable\n",135 addr);136 return -EINVAL;137 }138 139 msg[0] = addr;140 msg[1] = val;141 ret = i2c_master_send(aat2870->client, msg, 2);142 if (ret < 0)143 return ret;144 if (ret != 2)145 return -EIO;146 147 aat2870->reg_cache[addr].value = val;148 149 dev_dbg(aat2870->dev, "write: addr=0x%02x, val=0x%02x\n", addr, val);150 return 0;151}152 153static int aat2870_read(struct aat2870_data *aat2870, u8 addr, u8 *val)154{155 int ret;156 157 mutex_lock(&aat2870->io_lock);158 ret = __aat2870_read(aat2870, addr, val);159 mutex_unlock(&aat2870->io_lock);160 161 return ret;162}163 164static int aat2870_write(struct aat2870_data *aat2870, u8 addr, u8 val)165{166 int ret;167 168 mutex_lock(&aat2870->io_lock);169 ret = __aat2870_write(aat2870, addr, val);170 mutex_unlock(&aat2870->io_lock);171 172 return ret;173}174 175static int aat2870_update(struct aat2870_data *aat2870, u8 addr, u8 mask,176 u8 val)177{178 int change;179 u8 old_val, new_val;180 int ret;181 182 mutex_lock(&aat2870->io_lock);183 184 ret = __aat2870_read(aat2870, addr, &old_val);185 if (ret)186 goto out_unlock;187 188 new_val = (old_val & ~mask) | (val & mask);189 change = old_val != new_val;190 if (change)191 ret = __aat2870_write(aat2870, addr, new_val);192 193out_unlock:194 mutex_unlock(&aat2870->io_lock);195 196 return ret;197}198 199static inline void aat2870_enable(struct aat2870_data *aat2870)200{201 if (aat2870->en_pin >= 0)202 gpio_set_value(aat2870->en_pin, 1);203 204 aat2870->is_enable = 1;205}206 207static inline void aat2870_disable(struct aat2870_data *aat2870)208{209 if (aat2870->en_pin >= 0)210 gpio_set_value(aat2870->en_pin, 0);211 212 aat2870->is_enable = 0;213}214 215#ifdef CONFIG_DEBUG_FS216static ssize_t aat2870_dump_reg(struct aat2870_data *aat2870, char *buf)217{218 u8 addr, val;219 ssize_t count = 0;220 int ret;221 222 count += sprintf(buf, "aat2870 registers\n");223 for (addr = 0; addr < AAT2870_REG_NUM; addr++) {224 count += snprintf(buf + count, PAGE_SIZE - count, "0x%02x: ", addr);225 if (count >= PAGE_SIZE - 1)226 break;227 228 ret = aat2870->read(aat2870, addr, &val);229 if (ret == 0)230 count += snprintf(buf + count, PAGE_SIZE - count,231 "0x%02x", val);232 else233 count += snprintf(buf + count, PAGE_SIZE - count,234 "<read fail: %d>", ret);235 236 if (count >= PAGE_SIZE - 1)237 break;238 239 count += snprintf(buf + count, PAGE_SIZE - count, "\n");240 if (count >= PAGE_SIZE - 1)241 break;242 }243 244 /* Truncate count; min() would cause a warning */245 if (count >= PAGE_SIZE)246 count = PAGE_SIZE - 1;247 248 return count;249}250 251static ssize_t aat2870_reg_read_file(struct file *file, char __user *user_buf,252 size_t count, loff_t *ppos)253{254 struct aat2870_data *aat2870 = file->private_data;255 char *buf;256 ssize_t ret;257 258 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);259 if (!buf)260 return -ENOMEM;261 262 ret = aat2870_dump_reg(aat2870, buf);263 if (ret >= 0)264 ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);265 266 kfree(buf);267 268 return ret;269}270 271static ssize_t aat2870_reg_write_file(struct file *file,272 const char __user *user_buf, size_t count,273 loff_t *ppos)274{275 struct aat2870_data *aat2870 = file->private_data;276 char buf[32];277 ssize_t buf_size;278 char *start = buf;279 unsigned long addr, val;280 int ret;281 282 buf_size = min(count, (size_t)(sizeof(buf)-1));283 if (copy_from_user(buf, user_buf, buf_size)) {284 dev_err(aat2870->dev, "Failed to copy from user\n");285 return -EFAULT;286 }287 buf[buf_size] = 0;288 289 while (*start == ' ')290 start++;291 292 ret = kstrtoul(start, 16, &addr);293 if (ret)294 return ret;295 296 if (addr >= AAT2870_REG_NUM) {297 dev_err(aat2870->dev, "Invalid address, 0x%lx\n", addr);298 return -EINVAL;299 }300 301 while (*start == ' ')302 start++;303 304 ret = kstrtoul(start, 16, &val);305 if (ret)306 return ret;307 308 ret = aat2870->write(aat2870, (u8)addr, (u8)val);309 if (ret)310 return ret;311 312 return buf_size;313}314 315static const struct file_operations aat2870_reg_fops = {316 .open = simple_open,317 .read = aat2870_reg_read_file,318 .write = aat2870_reg_write_file,319};320 321static void aat2870_init_debugfs(struct aat2870_data *aat2870)322{323 aat2870->dentry_root = debugfs_create_dir("aat2870", NULL);324 325 debugfs_create_file("regs", 0644, aat2870->dentry_root, aat2870,326 &aat2870_reg_fops);327}328 329#else330static inline void aat2870_init_debugfs(struct aat2870_data *aat2870)331{332}333#endif /* CONFIG_DEBUG_FS */334 335static int aat2870_i2c_probe(struct i2c_client *client)336{337 struct aat2870_platform_data *pdata = dev_get_platdata(&client->dev);338 struct aat2870_data *aat2870;339 int i, j;340 int ret = 0;341 342 aat2870 = devm_kzalloc(&client->dev, sizeof(struct aat2870_data),343 GFP_KERNEL);344 if (!aat2870)345 return -ENOMEM;346 347 aat2870->dev = &client->dev;348 aat2870->client = client;349 i2c_set_clientdata(client, aat2870);350 351 aat2870->reg_cache = aat2870_regs;352 353 if (pdata->en_pin < 0)354 aat2870->en_pin = -1;355 else356 aat2870->en_pin = pdata->en_pin;357 358 aat2870->init = pdata->init;359 aat2870->uninit = pdata->uninit;360 aat2870->read = aat2870_read;361 aat2870->write = aat2870_write;362 aat2870->update = aat2870_update;363 364 mutex_init(&aat2870->io_lock);365 366 if (aat2870->init)367 aat2870->init(aat2870);368 369 if (aat2870->en_pin >= 0) {370 ret = devm_gpio_request_one(&client->dev, aat2870->en_pin,371 GPIOF_OUT_INIT_HIGH, "aat2870-en");372 if (ret < 0) {373 dev_err(&client->dev,374 "Failed to request GPIO %d\n", aat2870->en_pin);375 return ret;376 }377 }378 379 aat2870_enable(aat2870);380 381 for (i = 0; i < pdata->num_subdevs; i++) {382 for (j = 0; j < ARRAY_SIZE(aat2870_devs); j++) {383 if ((pdata->subdevs[i].id == aat2870_devs[j].id) &&384 !strcmp(pdata->subdevs[i].name,385 aat2870_devs[j].name)) {386 aat2870_devs[j].platform_data =387 pdata->subdevs[i].platform_data;388 break;389 }390 }391 }392 393 ret = mfd_add_devices(aat2870->dev, 0, aat2870_devs,394 ARRAY_SIZE(aat2870_devs), NULL, 0, NULL);395 if (ret != 0) {396 dev_err(aat2870->dev, "Failed to add subdev: %d\n", ret);397 goto out_disable;398 }399 400 aat2870_init_debugfs(aat2870);401 402 return 0;403 404out_disable:405 aat2870_disable(aat2870);406 return ret;407}408 409static int aat2870_i2c_suspend(struct device *dev)410{411 struct i2c_client *client = to_i2c_client(dev);412 struct aat2870_data *aat2870 = i2c_get_clientdata(client);413 414 aat2870_disable(aat2870);415 416 return 0;417}418 419static int aat2870_i2c_resume(struct device *dev)420{421 struct i2c_client *client = to_i2c_client(dev);422 struct aat2870_data *aat2870 = i2c_get_clientdata(client);423 struct aat2870_register *reg = NULL;424 int i;425 426 aat2870_enable(aat2870);427 428 /* restore registers */429 for (i = 0; i < AAT2870_REG_NUM; i++) {430 reg = &aat2870->reg_cache[i];431 if (reg->writeable)432 aat2870->write(aat2870, i, reg->value);433 }434 435 return 0;436}437 438static DEFINE_SIMPLE_DEV_PM_OPS(aat2870_pm_ops, aat2870_i2c_suspend,439 aat2870_i2c_resume);440 441static const struct i2c_device_id aat2870_i2c_id_table[] = {442 { "aat2870" },443 { }444};445 446static struct i2c_driver aat2870_i2c_driver = {447 .driver = {448 .name = "aat2870",449 .pm = pm_sleep_ptr(&aat2870_pm_ops),450 .suppress_bind_attrs = true,451 },452 .probe = aat2870_i2c_probe,453 .id_table = aat2870_i2c_id_table,454};455 456static int __init aat2870_init(void)457{458 return i2c_add_driver(&aat2870_i2c_driver);459}460subsys_initcall(aat2870_init);461