466 lines
10 KiB
C
466 lines
10 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* linux/drivers/mfd/aat2870-core.c
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*
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* Copyright (c) 2011, NVIDIA Corporation.
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* Author: Jin Park <jinyoungp@nvidia.com>
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/debugfs.h>
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#include <linux/slab.h>
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#include <linux/uaccess.h>
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#include <linux/i2c.h>
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#include <linux/delay.h>
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#include <linux/gpio.h>
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#include <linux/mfd/core.h>
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#include <linux/mfd/aat2870.h>
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#include <linux/regulator/machine.h>
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static struct aat2870_register aat2870_regs[AAT2870_REG_NUM] = {
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/* readable, writeable, value */
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{ 0, 1, 0x00 }, /* 0x00 AAT2870_BL_CH_EN */
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{ 0, 1, 0x16 }, /* 0x01 AAT2870_BLM */
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{ 0, 1, 0x16 }, /* 0x02 AAT2870_BLS */
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{ 0, 1, 0x56 }, /* 0x03 AAT2870_BL1 */
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{ 0, 1, 0x56 }, /* 0x04 AAT2870_BL2 */
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{ 0, 1, 0x56 }, /* 0x05 AAT2870_BL3 */
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{ 0, 1, 0x56 }, /* 0x06 AAT2870_BL4 */
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{ 0, 1, 0x56 }, /* 0x07 AAT2870_BL5 */
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{ 0, 1, 0x56 }, /* 0x08 AAT2870_BL6 */
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{ 0, 1, 0x56 }, /* 0x09 AAT2870_BL7 */
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{ 0, 1, 0x56 }, /* 0x0A AAT2870_BL8 */
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{ 0, 1, 0x00 }, /* 0x0B AAT2870_FLR */
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{ 0, 1, 0x03 }, /* 0x0C AAT2870_FM */
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{ 0, 1, 0x03 }, /* 0x0D AAT2870_FS */
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{ 0, 1, 0x10 }, /* 0x0E AAT2870_ALS_CFG0 */
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{ 0, 1, 0x06 }, /* 0x0F AAT2870_ALS_CFG1 */
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{ 0, 1, 0x00 }, /* 0x10 AAT2870_ALS_CFG2 */
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{ 1, 0, 0x00 }, /* 0x11 AAT2870_AMB */
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{ 0, 1, 0x00 }, /* 0x12 AAT2870_ALS0 */
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{ 0, 1, 0x00 }, /* 0x13 AAT2870_ALS1 */
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{ 0, 1, 0x00 }, /* 0x14 AAT2870_ALS2 */
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{ 0, 1, 0x00 }, /* 0x15 AAT2870_ALS3 */
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{ 0, 1, 0x00 }, /* 0x16 AAT2870_ALS4 */
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{ 0, 1, 0x00 }, /* 0x17 AAT2870_ALS5 */
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{ 0, 1, 0x00 }, /* 0x18 AAT2870_ALS6 */
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{ 0, 1, 0x00 }, /* 0x19 AAT2870_ALS7 */
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{ 0, 1, 0x00 }, /* 0x1A AAT2870_ALS8 */
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{ 0, 1, 0x00 }, /* 0x1B AAT2870_ALS9 */
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{ 0, 1, 0x00 }, /* 0x1C AAT2870_ALSA */
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{ 0, 1, 0x00 }, /* 0x1D AAT2870_ALSB */
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{ 0, 1, 0x00 }, /* 0x1E AAT2870_ALSC */
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{ 0, 1, 0x00 }, /* 0x1F AAT2870_ALSD */
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{ 0, 1, 0x00 }, /* 0x20 AAT2870_ALSE */
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{ 0, 1, 0x00 }, /* 0x21 AAT2870_ALSF */
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{ 0, 1, 0x00 }, /* 0x22 AAT2870_SUB_SET */
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{ 0, 1, 0x00 }, /* 0x23 AAT2870_SUB_CTRL */
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{ 0, 1, 0x00 }, /* 0x24 AAT2870_LDO_AB */
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{ 0, 1, 0x00 }, /* 0x25 AAT2870_LDO_CD */
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{ 0, 1, 0x00 }, /* 0x26 AAT2870_LDO_EN */
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};
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static struct mfd_cell aat2870_devs[] = {
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{
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.name = "aat2870-backlight",
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.id = AAT2870_ID_BL,
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.pdata_size = sizeof(struct aat2870_bl_platform_data),
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},
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{
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.name = "aat2870-regulator",
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.id = AAT2870_ID_LDOA,
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.pdata_size = sizeof(struct regulator_init_data),
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},
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{
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.name = "aat2870-regulator",
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.id = AAT2870_ID_LDOB,
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.pdata_size = sizeof(struct regulator_init_data),
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},
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{
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.name = "aat2870-regulator",
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.id = AAT2870_ID_LDOC,
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.pdata_size = sizeof(struct regulator_init_data),
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},
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{
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.name = "aat2870-regulator",
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.id = AAT2870_ID_LDOD,
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.pdata_size = sizeof(struct regulator_init_data),
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},
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};
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static int __aat2870_read(struct aat2870_data *aat2870, u8 addr, u8 *val)
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{
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int ret;
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if (addr >= AAT2870_REG_NUM) {
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dev_err(aat2870->dev, "Invalid address, 0x%02x\n", addr);
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return -EINVAL;
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}
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if (!aat2870->reg_cache[addr].readable) {
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*val = aat2870->reg_cache[addr].value;
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goto out;
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}
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ret = i2c_master_send(aat2870->client, &addr, 1);
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if (ret < 0)
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return ret;
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if (ret != 1)
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return -EIO;
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ret = i2c_master_recv(aat2870->client, val, 1);
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if (ret < 0)
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return ret;
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if (ret != 1)
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return -EIO;
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out:
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dev_dbg(aat2870->dev, "read: addr=0x%02x, val=0x%02x\n", addr, *val);
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return 0;
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}
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static int __aat2870_write(struct aat2870_data *aat2870, u8 addr, u8 val)
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{
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u8 msg[2];
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int ret;
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if (addr >= AAT2870_REG_NUM) {
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dev_err(aat2870->dev, "Invalid address, 0x%02x\n", addr);
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return -EINVAL;
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}
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if (!aat2870->reg_cache[addr].writeable) {
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dev_err(aat2870->dev, "Address 0x%02x is not writeable\n",
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addr);
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return -EINVAL;
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}
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msg[0] = addr;
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msg[1] = val;
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ret = i2c_master_send(aat2870->client, msg, 2);
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if (ret < 0)
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return ret;
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if (ret != 2)
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return -EIO;
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aat2870->reg_cache[addr].value = val;
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dev_dbg(aat2870->dev, "write: addr=0x%02x, val=0x%02x\n", addr, val);
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return 0;
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}
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static int aat2870_read(struct aat2870_data *aat2870, u8 addr, u8 *val)
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{
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int ret;
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mutex_lock(&aat2870->io_lock);
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ret = __aat2870_read(aat2870, addr, val);
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mutex_unlock(&aat2870->io_lock);
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return ret;
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}
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static int aat2870_write(struct aat2870_data *aat2870, u8 addr, u8 val)
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{
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int ret;
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mutex_lock(&aat2870->io_lock);
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ret = __aat2870_write(aat2870, addr, val);
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mutex_unlock(&aat2870->io_lock);
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return ret;
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}
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static int aat2870_update(struct aat2870_data *aat2870, u8 addr, u8 mask,
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u8 val)
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{
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int change;
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u8 old_val, new_val;
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int ret;
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mutex_lock(&aat2870->io_lock);
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ret = __aat2870_read(aat2870, addr, &old_val);
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if (ret)
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goto out_unlock;
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new_val = (old_val & ~mask) | (val & mask);
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change = old_val != new_val;
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if (change)
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ret = __aat2870_write(aat2870, addr, new_val);
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out_unlock:
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mutex_unlock(&aat2870->io_lock);
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return ret;
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}
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static inline void aat2870_enable(struct aat2870_data *aat2870)
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{
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if (aat2870->en_pin >= 0)
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gpio_set_value(aat2870->en_pin, 1);
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aat2870->is_enable = 1;
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}
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static inline void aat2870_disable(struct aat2870_data *aat2870)
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{
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if (aat2870->en_pin >= 0)
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gpio_set_value(aat2870->en_pin, 0);
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aat2870->is_enable = 0;
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}
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#ifdef CONFIG_DEBUG_FS
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static ssize_t aat2870_dump_reg(struct aat2870_data *aat2870, char *buf)
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{
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u8 addr, val;
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ssize_t count = 0;
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int ret;
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count += sprintf(buf, "aat2870 registers\n");
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for (addr = 0; addr < AAT2870_REG_NUM; addr++) {
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count += snprintf(buf + count, PAGE_SIZE - count, "0x%02x: ", addr);
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if (count >= PAGE_SIZE - 1)
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break;
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ret = aat2870->read(aat2870, addr, &val);
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if (ret == 0)
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count += snprintf(buf + count, PAGE_SIZE - count,
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"0x%02x", val);
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else
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count += snprintf(buf + count, PAGE_SIZE - count,
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"<read fail: %d>", ret);
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if (count >= PAGE_SIZE - 1)
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break;
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count += snprintf(buf + count, PAGE_SIZE - count, "\n");
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if (count >= PAGE_SIZE - 1)
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break;
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}
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/* Truncate count; min() would cause a warning */
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if (count >= PAGE_SIZE)
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count = PAGE_SIZE - 1;
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return count;
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}
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static ssize_t aat2870_reg_read_file(struct file *file, char __user *user_buf,
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size_t count, loff_t *ppos)
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{
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struct aat2870_data *aat2870 = file->private_data;
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char *buf;
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ssize_t ret;
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buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
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if (!buf)
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return -ENOMEM;
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ret = aat2870_dump_reg(aat2870, buf);
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if (ret >= 0)
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ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
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kfree(buf);
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return ret;
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}
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static ssize_t aat2870_reg_write_file(struct file *file,
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const char __user *user_buf, size_t count,
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loff_t *ppos)
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{
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struct aat2870_data *aat2870 = file->private_data;
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char buf[32];
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ssize_t buf_size;
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char *start = buf;
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unsigned long addr, val;
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int ret;
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buf_size = min(count, (size_t)(sizeof(buf)-1));
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if (copy_from_user(buf, user_buf, buf_size)) {
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dev_err(aat2870->dev, "Failed to copy from user\n");
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return -EFAULT;
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}
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buf[buf_size] = 0;
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while (*start == ' ')
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start++;
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ret = kstrtoul(start, 16, &addr);
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if (ret)
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return ret;
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if (addr >= AAT2870_REG_NUM) {
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dev_err(aat2870->dev, "Invalid address, 0x%lx\n", addr);
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return -EINVAL;
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}
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while (*start == ' ')
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start++;
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ret = kstrtoul(start, 16, &val);
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if (ret)
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return ret;
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ret = aat2870->write(aat2870, (u8)addr, (u8)val);
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if (ret)
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return ret;
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return buf_size;
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}
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static const struct file_operations aat2870_reg_fops = {
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.open = simple_open,
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.read = aat2870_reg_read_file,
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.write = aat2870_reg_write_file,
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};
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static void aat2870_init_debugfs(struct aat2870_data *aat2870)
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{
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aat2870->dentry_root = debugfs_create_dir("aat2870", NULL);
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debugfs_create_file("regs", 0644, aat2870->dentry_root, aat2870,
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&aat2870_reg_fops);
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}
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#else
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static inline void aat2870_init_debugfs(struct aat2870_data *aat2870)
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{
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}
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#endif /* CONFIG_DEBUG_FS */
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static int aat2870_i2c_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct aat2870_platform_data *pdata = dev_get_platdata(&client->dev);
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struct aat2870_data *aat2870;
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int i, j;
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int ret = 0;
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aat2870 = devm_kzalloc(&client->dev, sizeof(struct aat2870_data),
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GFP_KERNEL);
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if (!aat2870)
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return -ENOMEM;
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aat2870->dev = &client->dev;
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dev_set_drvdata(aat2870->dev, aat2870);
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aat2870->client = client;
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i2c_set_clientdata(client, aat2870);
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aat2870->reg_cache = aat2870_regs;
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if (pdata->en_pin < 0)
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aat2870->en_pin = -1;
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else
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aat2870->en_pin = pdata->en_pin;
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aat2870->init = pdata->init;
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aat2870->uninit = pdata->uninit;
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aat2870->read = aat2870_read;
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aat2870->write = aat2870_write;
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aat2870->update = aat2870_update;
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mutex_init(&aat2870->io_lock);
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if (aat2870->init)
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aat2870->init(aat2870);
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if (aat2870->en_pin >= 0) {
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ret = devm_gpio_request_one(&client->dev, aat2870->en_pin,
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GPIOF_OUT_INIT_HIGH, "aat2870-en");
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if (ret < 0) {
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dev_err(&client->dev,
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"Failed to request GPIO %d\n", aat2870->en_pin);
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return ret;
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}
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}
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aat2870_enable(aat2870);
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for (i = 0; i < pdata->num_subdevs; i++) {
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for (j = 0; j < ARRAY_SIZE(aat2870_devs); j++) {
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if ((pdata->subdevs[i].id == aat2870_devs[j].id) &&
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!strcmp(pdata->subdevs[i].name,
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aat2870_devs[j].name)) {
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aat2870_devs[j].platform_data =
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pdata->subdevs[i].platform_data;
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break;
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}
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}
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}
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ret = mfd_add_devices(aat2870->dev, 0, aat2870_devs,
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ARRAY_SIZE(aat2870_devs), NULL, 0, NULL);
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if (ret != 0) {
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dev_err(aat2870->dev, "Failed to add subdev: %d\n", ret);
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goto out_disable;
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}
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aat2870_init_debugfs(aat2870);
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return 0;
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out_disable:
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aat2870_disable(aat2870);
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return ret;
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}
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#ifdef CONFIG_PM_SLEEP
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static int aat2870_i2c_suspend(struct device *dev)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct aat2870_data *aat2870 = i2c_get_clientdata(client);
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aat2870_disable(aat2870);
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return 0;
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}
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static int aat2870_i2c_resume(struct device *dev)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct aat2870_data *aat2870 = i2c_get_clientdata(client);
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struct aat2870_register *reg = NULL;
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int i;
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aat2870_enable(aat2870);
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/* restore registers */
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for (i = 0; i < AAT2870_REG_NUM; i++) {
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reg = &aat2870->reg_cache[i];
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if (reg->writeable)
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aat2870->write(aat2870, i, reg->value);
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}
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return 0;
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}
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#endif /* CONFIG_PM_SLEEP */
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static SIMPLE_DEV_PM_OPS(aat2870_pm_ops, aat2870_i2c_suspend,
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aat2870_i2c_resume);
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static const struct i2c_device_id aat2870_i2c_id_table[] = {
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{ "aat2870", 0 },
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{ }
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};
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static struct i2c_driver aat2870_i2c_driver = {
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.driver = {
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.name = "aat2870",
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.pm = &aat2870_pm_ops,
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.suppress_bind_attrs = true,
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},
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.probe = aat2870_i2c_probe,
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.id_table = aat2870_i2c_id_table,
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};
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static int __init aat2870_init(void)
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{
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return i2c_add_driver(&aat2870_i2c_driver);
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}
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subsys_initcall(aat2870_init);
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