mirror of
https://github.com/torvalds/linux
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0dd96360e2
Two variables named master_int and sleepseq_val, were just declared without initialization. Pointers to these variables were passed to mfd read function. After that these variables were used for some of the logical operations. Though logically there is nothing wrong, compiler is complaining that the variables may be used uninitialized. Hence fixing these warning messages by initializing them. Signed-off-by: Venu Byravarasu <vbyravarasu@nvidia.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
348 lines
8.8 KiB
C
348 lines
8.8 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-gpio",},
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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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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 = 0;
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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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EXPORT_SYMBOL(rc5t583_ext_power_req_config);
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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 = devm_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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return ret;
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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, NULL);
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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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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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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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