387 lines
9.8 KiB
C
387 lines
9.8 KiB
C
/*
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* Core driver access RC5T583 power management chip.
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*
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* Copyright (c) 2011-2012, NVIDIA CORPORATION. All rights reserved.
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* Author: Laxman dewangan <ldewangan@nvidia.com>
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*
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* Based on code
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* Copyright (C) 2011 RICOH COMPANY,LTD
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include <linux/interrupt.h>
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#include <linux/irq.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/err.h>
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#include <linux/slab.h>
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#include <linux/i2c.h>
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#include <linux/mfd/core.h>
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#include <linux/mfd/rc5t583.h>
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#include <linux/regmap.h>
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#define RICOH_ONOFFSEL_REG 0x10
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#define RICOH_SWCTL_REG 0x5E
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struct deepsleep_control_data {
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u8 reg_add;
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u8 ds_pos_bit;
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};
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#define DEEPSLEEP_INIT(_id, _reg, _pos) \
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{ \
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.reg_add = RC5T583_##_reg, \
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.ds_pos_bit = _pos, \
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}
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static struct deepsleep_control_data deepsleep_data[] = {
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DEEPSLEEP_INIT(DC0, SLPSEQ1, 0),
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DEEPSLEEP_INIT(DC1, SLPSEQ1, 4),
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DEEPSLEEP_INIT(DC2, SLPSEQ2, 0),
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DEEPSLEEP_INIT(DC3, SLPSEQ2, 4),
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DEEPSLEEP_INIT(LDO0, SLPSEQ3, 0),
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DEEPSLEEP_INIT(LDO1, SLPSEQ3, 4),
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DEEPSLEEP_INIT(LDO2, SLPSEQ4, 0),
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DEEPSLEEP_INIT(LDO3, SLPSEQ4, 4),
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DEEPSLEEP_INIT(LDO4, SLPSEQ5, 0),
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DEEPSLEEP_INIT(LDO5, SLPSEQ5, 4),
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DEEPSLEEP_INIT(LDO6, SLPSEQ6, 0),
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DEEPSLEEP_INIT(LDO7, SLPSEQ6, 4),
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DEEPSLEEP_INIT(LDO8, SLPSEQ7, 0),
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DEEPSLEEP_INIT(LDO9, SLPSEQ7, 4),
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DEEPSLEEP_INIT(PSO0, SLPSEQ8, 0),
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DEEPSLEEP_INIT(PSO1, SLPSEQ8, 4),
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DEEPSLEEP_INIT(PSO2, SLPSEQ9, 0),
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DEEPSLEEP_INIT(PSO3, SLPSEQ9, 4),
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DEEPSLEEP_INIT(PSO4, SLPSEQ10, 0),
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DEEPSLEEP_INIT(PSO5, SLPSEQ10, 4),
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DEEPSLEEP_INIT(PSO6, SLPSEQ11, 0),
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DEEPSLEEP_INIT(PSO7, SLPSEQ11, 4),
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};
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#define EXT_PWR_REQ \
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(RC5T583_EXT_PWRREQ1_CONTROL | RC5T583_EXT_PWRREQ2_CONTROL)
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static struct mfd_cell rc5t583_subdevs[] = {
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{.name = "rc5t583-regulator",},
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{.name = "rc5t583-rtc", },
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{.name = "rc5t583-key", }
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};
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int rc5t583_write(struct device *dev, uint8_t reg, uint8_t val)
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{
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struct rc5t583 *rc5t583 = dev_get_drvdata(dev);
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return regmap_write(rc5t583->regmap, reg, val);
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}
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int rc5t583_read(struct device *dev, uint8_t reg, uint8_t *val)
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{
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struct rc5t583 *rc5t583 = dev_get_drvdata(dev);
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unsigned int ival;
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int ret;
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ret = regmap_read(rc5t583->regmap, reg, &ival);
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if (!ret)
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*val = (uint8_t)ival;
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return ret;
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}
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int rc5t583_set_bits(struct device *dev, unsigned int reg,
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unsigned int bit_mask)
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{
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struct rc5t583 *rc5t583 = dev_get_drvdata(dev);
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return regmap_update_bits(rc5t583->regmap, reg, bit_mask, bit_mask);
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}
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int rc5t583_clear_bits(struct device *dev, unsigned int reg,
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unsigned int bit_mask)
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{
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struct rc5t583 *rc5t583 = dev_get_drvdata(dev);
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return regmap_update_bits(rc5t583->regmap, reg, bit_mask, 0);
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}
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int rc5t583_update(struct device *dev, unsigned int reg,
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unsigned int val, unsigned int mask)
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{
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struct rc5t583 *rc5t583 = dev_get_drvdata(dev);
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return regmap_update_bits(rc5t583->regmap, reg, mask, val);
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}
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static int __rc5t583_set_ext_pwrreq1_control(struct device *dev,
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int id, int ext_pwr, int slots)
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{
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int ret;
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uint8_t sleepseq_val;
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unsigned int en_bit;
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unsigned int slot_bit;
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if (id == RC5T583_DS_DC0) {
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dev_err(dev, "PWRREQ1 is invalid control for rail %d\n", id);
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return -EINVAL;
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}
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en_bit = deepsleep_data[id].ds_pos_bit;
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slot_bit = en_bit + 1;
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ret = rc5t583_read(dev, deepsleep_data[id].reg_add, &sleepseq_val);
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if (ret < 0) {
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dev_err(dev, "Error in reading reg 0x%x\n",
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deepsleep_data[id].reg_add);
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return ret;
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}
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sleepseq_val &= ~(0xF << en_bit);
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sleepseq_val |= BIT(en_bit);
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sleepseq_val |= ((slots & 0x7) << slot_bit);
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ret = rc5t583_set_bits(dev, RICOH_ONOFFSEL_REG, BIT(1));
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if (ret < 0) {
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dev_err(dev, "Error in updating the 0x%02x register\n",
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RICOH_ONOFFSEL_REG);
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return ret;
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}
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ret = rc5t583_write(dev, deepsleep_data[id].reg_add, sleepseq_val);
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if (ret < 0) {
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dev_err(dev, "Error in writing reg 0x%x\n",
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deepsleep_data[id].reg_add);
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return ret;
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}
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if (id == RC5T583_DS_LDO4) {
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ret = rc5t583_write(dev, RICOH_SWCTL_REG, 0x1);
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if (ret < 0)
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dev_err(dev, "Error in writing reg 0x%x\n",
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RICOH_SWCTL_REG);
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}
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return ret;
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}
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static int __rc5t583_set_ext_pwrreq2_control(struct device *dev,
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int id, int ext_pwr)
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{
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int ret;
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if (id != RC5T583_DS_DC0) {
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dev_err(dev, "PWRREQ2 is invalid control for rail %d\n", id);
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return -EINVAL;
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}
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ret = rc5t583_set_bits(dev, RICOH_ONOFFSEL_REG, BIT(2));
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if (ret < 0)
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dev_err(dev, "Error in updating the ONOFFSEL 0x10 register\n");
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return ret;
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}
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int rc5t583_ext_power_req_config(struct device *dev, int ds_id,
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int ext_pwr_req, int deepsleep_slot_nr)
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{
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if ((ext_pwr_req & EXT_PWR_REQ) == EXT_PWR_REQ)
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return -EINVAL;
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if (ext_pwr_req & RC5T583_EXT_PWRREQ1_CONTROL)
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return __rc5t583_set_ext_pwrreq1_control(dev, ds_id,
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ext_pwr_req, deepsleep_slot_nr);
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if (ext_pwr_req & RC5T583_EXT_PWRREQ2_CONTROL)
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return __rc5t583_set_ext_pwrreq2_control(dev,
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ds_id, ext_pwr_req);
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return 0;
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}
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static int rc5t583_clear_ext_power_req(struct rc5t583 *rc5t583,
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struct rc5t583_platform_data *pdata)
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{
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int ret;
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int i;
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uint8_t on_off_val = 0;
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/* Clear ONOFFSEL register */
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if (pdata->enable_shutdown)
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on_off_val = 0x1;
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ret = rc5t583_write(rc5t583->dev, RICOH_ONOFFSEL_REG, on_off_val);
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if (ret < 0)
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dev_warn(rc5t583->dev, "Error in writing reg %d error: %d\n",
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RICOH_ONOFFSEL_REG, ret);
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ret = rc5t583_write(rc5t583->dev, RICOH_SWCTL_REG, 0x0);
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if (ret < 0)
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dev_warn(rc5t583->dev, "Error in writing reg %d error: %d\n",
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RICOH_SWCTL_REG, ret);
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/* Clear sleep sequence register */
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for (i = RC5T583_SLPSEQ1; i <= RC5T583_SLPSEQ11; ++i) {
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ret = rc5t583_write(rc5t583->dev, i, 0x0);
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if (ret < 0)
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dev_warn(rc5t583->dev,
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"Error in writing reg 0x%02x error: %d\n",
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i, ret);
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}
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return 0;
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}
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static bool volatile_reg(struct device *dev, unsigned int reg)
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{
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/* Enable caching in interrupt registers */
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switch (reg) {
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case RC5T583_INT_EN_SYS1:
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case RC5T583_INT_EN_SYS2:
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case RC5T583_INT_EN_DCDC:
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case RC5T583_INT_EN_RTC:
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case RC5T583_INT_EN_ADC1:
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case RC5T583_INT_EN_ADC2:
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case RC5T583_INT_EN_ADC3:
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case RC5T583_GPIO_GPEDGE1:
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case RC5T583_GPIO_GPEDGE2:
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case RC5T583_GPIO_EN_INT:
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return false;
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case RC5T583_GPIO_MON_IOIN:
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/* This is gpio input register */
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return true;
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default:
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/* Enable caching in gpio registers */
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if ((reg >= RC5T583_GPIO_IOSEL) &&
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(reg <= RC5T583_GPIO_GPOFUNC))
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return false;
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/* Enable caching in sleep seq registers */
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if ((reg >= RC5T583_SLPSEQ1) && (reg <= RC5T583_SLPSEQ11))
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return false;
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/* Enable caching of regulator registers */
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if ((reg >= RC5T583_REG_DC0CTL) && (reg <= RC5T583_REG_SR3CTL))
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return false;
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if ((reg >= RC5T583_REG_LDOEN1) &&
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(reg <= RC5T583_REG_LDO9DAC_DS))
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return false;
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break;
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}
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return true;
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}
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static const struct regmap_config rc5t583_regmap_config = {
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.reg_bits = 8,
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.val_bits = 8,
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.volatile_reg = volatile_reg,
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.max_register = RC5T583_MAX_REGS,
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.num_reg_defaults_raw = RC5T583_MAX_REGS,
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.cache_type = REGCACHE_RBTREE,
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};
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static int __devinit rc5t583_i2c_probe(struct i2c_client *i2c,
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const struct i2c_device_id *id)
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{
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struct rc5t583 *rc5t583;
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struct rc5t583_platform_data *pdata = i2c->dev.platform_data;
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int ret;
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bool irq_init_success = false;
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if (!pdata) {
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dev_err(&i2c->dev, "Err: Platform data not found\n");
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return -EINVAL;
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}
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rc5t583 = devm_kzalloc(&i2c->dev, sizeof(struct rc5t583), GFP_KERNEL);
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if (!rc5t583) {
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dev_err(&i2c->dev, "Memory allocation failed\n");
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return -ENOMEM;
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}
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rc5t583->dev = &i2c->dev;
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i2c_set_clientdata(i2c, rc5t583);
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rc5t583->regmap = regmap_init_i2c(i2c, &rc5t583_regmap_config);
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if (IS_ERR(rc5t583->regmap)) {
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ret = PTR_ERR(rc5t583->regmap);
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dev_err(&i2c->dev, "regmap initialization failed: %d\n", ret);
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return ret;
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}
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ret = rc5t583_clear_ext_power_req(rc5t583, pdata);
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if (ret < 0)
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goto err_irq_init;
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if (i2c->irq) {
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ret = rc5t583_irq_init(rc5t583, i2c->irq, pdata->irq_base);
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/* Still continue with waring if irq init fails */
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if (ret)
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dev_warn(&i2c->dev, "IRQ init failed: %d\n", ret);
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else
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irq_init_success = true;
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}
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ret = mfd_add_devices(rc5t583->dev, -1, rc5t583_subdevs,
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ARRAY_SIZE(rc5t583_subdevs), NULL, 0);
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if (ret) {
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dev_err(&i2c->dev, "add mfd devices failed: %d\n", ret);
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goto err_add_devs;
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}
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return 0;
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err_add_devs:
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if (irq_init_success)
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rc5t583_irq_exit(rc5t583);
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err_irq_init:
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regmap_exit(rc5t583->regmap);
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return ret;
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}
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static int __devexit rc5t583_i2c_remove(struct i2c_client *i2c)
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{
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struct rc5t583 *rc5t583 = i2c_get_clientdata(i2c);
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mfd_remove_devices(rc5t583->dev);
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rc5t583_irq_exit(rc5t583);
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regmap_exit(rc5t583->regmap);
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return 0;
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}
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static const struct i2c_device_id rc5t583_i2c_id[] = {
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{.name = "rc5t583", .driver_data = 0},
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{}
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};
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MODULE_DEVICE_TABLE(i2c, rc5t583_i2c_id);
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static struct i2c_driver rc5t583_i2c_driver = {
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.driver = {
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.name = "rc5t583",
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.owner = THIS_MODULE,
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},
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.probe = rc5t583_i2c_probe,
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.remove = __devexit_p(rc5t583_i2c_remove),
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.id_table = rc5t583_i2c_id,
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};
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static int __init rc5t583_i2c_init(void)
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{
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return i2c_add_driver(&rc5t583_i2c_driver);
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}
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subsys_initcall(rc5t583_i2c_init);
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static void __exit rc5t583_i2c_exit(void)
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{
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i2c_del_driver(&rc5t583_i2c_driver);
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}
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module_exit(rc5t583_i2c_exit);
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MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
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MODULE_DESCRIPTION("RICOH RC5T583 power management system device driver");
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MODULE_LICENSE("GPL v2");
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