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465 lines
10 KiB
465 lines
10 KiB
// 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 <[email protected]> |
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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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