blob: 6f98dc76d814eb849e922a08eb04c2e82550821c [file] [log] [blame]
/* Copyright (c) 2012-2013, The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/platform_device.h>
#include <linux/err.h>
#include <linux/pm_runtime.h>
#include <linux/regulator/consumer.h>
#include <linux/i2c.h>
#include <linux/gpio.h>
#include <linux/of_gpio.h>
#include <linux/of_device.h>
#include <linux/clk.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/smsc_hub.h>
#include <linux/module.h>
#include <mach/msm_xo.h>
static unsigned short normal_i2c[] = {
0, I2C_CLIENT_END };
struct hsic_hub {
struct device *dev;
struct smsc_hub_platform_data *pdata;
struct i2c_client *client;
struct msm_xo_voter *xo_handle;
struct clk *ref_clk;
struct regulator *hsic_hub_reg;
struct regulator *int_pad_reg, *hub_vbus_reg;
};
static struct hsic_hub *smsc_hub;
static struct platform_driver smsc_hub_driver;
/* APIs for setting/clearing bits and for reading/writing values */
static inline int hsic_hub_get_u8(struct i2c_client *client, u8 reg)
{
int ret;
ret = i2c_smbus_read_byte_data(client, reg);
if (ret < 0)
pr_err("%s:i2c_read8 failed\n", __func__);
return ret;
}
static inline int hsic_hub_get_u16(struct i2c_client *client, u8 reg)
{
int ret;
ret = i2c_smbus_read_word_data(client, reg);
if (ret < 0)
pr_err("%s:i2c_read16 failed\n", __func__);
return ret;
}
static inline int hsic_hub_write_word_data(struct i2c_client *client, u8 reg,
u16 value)
{
int ret;
ret = i2c_smbus_write_word_data(client, reg, value);
if (ret)
pr_err("%s:i2c_write16 failed\n", __func__);
return ret;
}
static inline int hsic_hub_write_byte_data(struct i2c_client *client, u8 reg,
u8 value)
{
int ret;
ret = i2c_smbus_write_byte_data(client, reg, value);
if (ret)
pr_err("%s:i2c_write_byte_data failed\n", __func__);
return ret;
}
static inline int hsic_hub_set_bits(struct i2c_client *client, u8 reg,
u8 value)
{
int ret;
ret = i2c_smbus_read_byte_data(client, reg);
if (ret < 0) {
pr_err("%s:i2c_read_byte_data failed\n", __func__);
return ret;
}
return i2c_smbus_write_byte_data(client, reg, (ret | value));
}
static inline int hsic_hub_clear_bits(struct i2c_client *client, u8 reg,
u8 value)
{
int ret;
ret = i2c_smbus_read_byte_data(client, reg);
if (ret < 0) {
pr_err("%s:i2c_read_byte_data failed\n", __func__);
return ret;
}
return i2c_smbus_write_byte_data(client, reg, (ret & ~value));
}
static int smsc4604_send_connect_cmd(struct i2c_client *client)
{
u8 buf[3];
buf[0] = 0xAA;
buf[1] = 0x55;
buf[2] = 0x00;
if (i2c_master_send(client, buf, 3) != 3) {
dev_err(&client->dev, "%s: i2c send failed\n", __func__);
return -EIO;
}
return 0;
}
static int i2c_hsic_hub_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA |
I2C_FUNC_SMBUS_WORD_DATA))
return -EIO;
switch (smsc_hub->pdata->model_id) {
case SMSC3503_ID:
/*
* CONFIG_N bit in SP_ILOCK register has to be set before
* changing other registers to change default configuration
* of hsic hub.
*/
hsic_hub_set_bits(client, SMSC3503_SP_ILOCK, CONFIG_N);
/*
* Can change default configuartion like VID,PID,
* strings etc by writing new values to hsic hub registers
*/
hsic_hub_write_word_data(client, SMSC3503_VENDORID, 0x05C6);
/*
* CONFIG_N bit in SP_ILOCK register has to be cleared
* for new values in registers to be effective after
* writing to other registers.
*/
hsic_hub_clear_bits(client, SMSC3503_SP_ILOCK, CONFIG_N);
break;
case SMSC4604_ID:
/*
* SMSC4604 requires an I2C attach command to be issued
* if I2C bus is connected
*/
return smsc4604_send_connect_cmd(client);
default:
return -EINVAL;
}
return 0;
}
static int i2c_hsic_hub_remove(struct i2c_client *client)
{
return 0;
}
static const struct i2c_device_id hsic_hub_id[] = {
{"i2c_hsic_hub", 0},
{}
};
MODULE_DEVICE_TABLE(i2c, hsichub_id);
static struct i2c_driver hsic_hub_driver = {
.driver = {
.name = "i2c_hsic_hub",
},
.probe = i2c_hsic_hub_probe,
.remove = i2c_hsic_hub_remove,
.id_table = hsic_hub_id,
};
static int msm_hsic_hub_init_clock(struct hsic_hub *hub, int init)
{
int ret;
if (!init) {
if (!IS_ERR(hub->ref_clk))
clk_disable_unprepare(hub->ref_clk);
else
msm_xo_put(smsc_hub->xo_handle);
return 0;
}
hub->ref_clk = devm_clk_get(hub->dev, "ref_clk");
if (IS_ERR(hub->ref_clk)) {
dev_dbg(hub->dev, "failed to get ref_clk\n");
/* In the absence of dedicated ref_clk, xo clocks the HUB */
smsc_hub->xo_handle = msm_xo_get(MSM_XO_TCXO_D1, "hsic_hub");
if (IS_ERR(smsc_hub->xo_handle)) {
dev_err(hub->dev, "not able to get the handle\n"
"for TCXO D1 buffer\n");
return PTR_ERR(smsc_hub->xo_handle);
}
ret = msm_xo_mode_vote(smsc_hub->xo_handle, MSM_XO_MODE_ON);
if (ret) {
dev_err(hub->dev, "failed to vote for TCXO\n"
"D1 buffer\n");
msm_xo_put(smsc_hub->xo_handle);
return ret;
}
} else {
ret = clk_prepare_enable(hub->ref_clk);
if (ret)
dev_err(hub->dev, "clk_enable failed for ref_clk\n");
}
return ret;
}
#define HSIC_HUB_INT_VOL_MIN 1800000 /* uV */
#define HSIC_HUB_INT_VOL_MAX 2950000 /* uV */
static int msm_hsic_hub_init_gpio(struct hsic_hub *hub, int init)
{
int ret;
struct smsc_hub_platform_data *pdata = hub->pdata;
if (!init) {
if (!IS_ERR(smsc_hub->int_pad_reg)) {
regulator_disable(smsc_hub->int_pad_reg);
regulator_set_voltage(smsc_hub->int_pad_reg, 0,
HSIC_HUB_INT_VOL_MAX);
}
return 0;
}
ret = devm_gpio_request(hub->dev, pdata->hub_reset, "HSIC_HUB_RESET");
if (ret < 0) {
dev_err(hub->dev, "gpio request failed for GPIO%d\n",
pdata->hub_reset);
return ret;
}
if (pdata->refclk_gpio) {
ret = devm_gpio_request(hub->dev, pdata->refclk_gpio,
"HSIC_HUB_CLK");
if (ret < 0)
dev_err(hub->dev, "gpio request failed (CLK GPIO)\n");
}
if (pdata->int_gpio) {
ret = devm_gpio_request(hub->dev, pdata->int_gpio,
"HSIC_HUB_INT");
if (ret < 0) {
dev_err(hub->dev, "gpio request failed (INT GPIO)\n");
return ret;
}
/* Enable LDO if required for external pull-up */
smsc_hub->int_pad_reg = devm_regulator_get(hub->dev, "hub_int");
if (IS_ERR(smsc_hub->int_pad_reg)) {
dev_dbg(hub->dev, "unable to get ext hub_int reg\n");
} else {
ret = regulator_set_voltage(smsc_hub->int_pad_reg,
HSIC_HUB_INT_VOL_MIN,
HSIC_HUB_INT_VOL_MAX);
if (ret) {
dev_err(hub->dev, "unable to set the voltage\n"
" for hsic hub int reg\n");
return ret;
}
ret = regulator_enable(smsc_hub->int_pad_reg);
if (ret) {
dev_err(hub->dev, "unable to enable int reg\n");
regulator_set_voltage(smsc_hub->int_pad_reg, 0,
HSIC_HUB_INT_VOL_MAX);
return ret;
}
}
}
return 0;
}
#define HSIC_HUB_VDD_VOL_MIN 1650000 /* uV */
#define HSIC_HUB_VDD_VOL_MAX 1950000 /* uV */
#define HSIC_HUB_VDD_LOAD 36000 /* uA */
static int msm_hsic_hub_init_vdd(struct hsic_hub *hub, int init)
{
int ret;
if (!init) {
if (!IS_ERR(smsc_hub->hsic_hub_reg)) {
regulator_disable(smsc_hub->hsic_hub_reg);
regulator_set_optimum_mode(smsc_hub->hsic_hub_reg, 0);
regulator_set_voltage(smsc_hub->hsic_hub_reg, 0,
HSIC_HUB_VDD_VOL_MAX);
}
return 0;
}
smsc_hub->hsic_hub_reg = devm_regulator_get(hub->dev, "EXT_HUB_VDDIO");
if (IS_ERR(smsc_hub->hsic_hub_reg)) {
dev_dbg(hub->dev, "unable to get ext hub vddcx\n");
} else {
ret = regulator_set_voltage(smsc_hub->hsic_hub_reg,
HSIC_HUB_VDD_VOL_MIN,
HSIC_HUB_VDD_VOL_MAX);
if (ret) {
dev_err(hub->dev, "unable to set the voltage\n"
"for hsic hub reg\n");
return ret;
}
ret = regulator_set_optimum_mode(smsc_hub->hsic_hub_reg,
HSIC_HUB_VDD_LOAD);
if (ret < 0) {
dev_err(hub->dev, "Unable to set mode of VDDCX\n");
goto reg_optimum_mode_fail;
}
ret = regulator_enable(smsc_hub->hsic_hub_reg);
if (ret) {
dev_err(hub->dev, "unable to enable ext hub vddcx\n");
goto reg_enable_fail;
}
}
return 0;
reg_enable_fail:
regulator_set_optimum_mode(smsc_hub->hsic_hub_reg, 0);
reg_optimum_mode_fail:
regulator_set_voltage(smsc_hub->hsic_hub_reg, 0,
HSIC_HUB_VDD_VOL_MAX);
return ret;
}
struct smsc_hub_platform_data *msm_hub_dt_to_pdata(
struct platform_device *pdev)
{
int rc;
u32 temp_val;
struct device_node *node = pdev->dev.of_node;
struct smsc_hub_platform_data *pdata;
pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
if (!pdata) {
dev_err(&pdev->dev, "unable to allocate platform data\n");
return ERR_PTR(-ENOMEM);
}
rc = of_property_read_u32(node, "smsc,model-id", &temp_val);
if (rc) {
dev_err(&pdev->dev, "Unable to read smsc,model-id\n");
return ERR_PTR(rc);
} else {
pdata->model_id = temp_val;
}
pdata->hub_reset = of_get_named_gpio(node, "smsc,reset-gpio", 0);
if (pdata->hub_reset < 0)
return ERR_PTR(pdata->hub_reset);
pdata->refclk_gpio = of_get_named_gpio(node, "smsc,refclk-gpio", 0);
if (pdata->refclk_gpio < 0)
pdata->refclk_gpio = 0;
pdata->int_gpio = of_get_named_gpio(node, "smsc,int-gpio", 0);
if (pdata->int_gpio < 0)
pdata->int_gpio = 0;
return pdata;
}
static int __devinit smsc_hub_probe(struct platform_device *pdev)
{
int ret = 0;
struct smsc_hub_platform_data *pdata;
struct device_node *node = pdev->dev.of_node;
struct i2c_adapter *i2c_adap;
struct i2c_board_info i2c_info;
struct of_dev_auxdata *hsic_host_auxdata;
if (pdev->dev.of_node) {
dev_dbg(&pdev->dev, "device tree enabled\n");
hsic_host_auxdata = dev_get_platdata(&pdev->dev);
pdata = msm_hub_dt_to_pdata(pdev);
if (IS_ERR(pdata))
return PTR_ERR(pdata);
} else {
pdata = pdev->dev.platform_data;
}
if (!pdata) {
dev_err(&pdev->dev, "No platform data\n");
return -ENODEV;
}
if (!pdata->hub_reset)
return -EINVAL;
smsc_hub = devm_kzalloc(&pdev->dev, sizeof(*smsc_hub), GFP_KERNEL);
if (!smsc_hub)
return -ENOMEM;
smsc_hub->dev = &pdev->dev;
smsc_hub->pdata = pdata;
smsc_hub->hub_vbus_reg = devm_regulator_get(&pdev->dev, "hub_vbus");
ret = PTR_ERR(smsc_hub->hub_vbus_reg);
if (ret == -EPROBE_DEFER) {
dev_dbg(&pdev->dev, "failed to get hub_vbus\n");
return ret;
}
ret = msm_hsic_hub_init_vdd(smsc_hub, 1);
if (ret) {
dev_err(&pdev->dev, "failed to init hub VDD\n");
return ret;
}
ret = msm_hsic_hub_init_clock(smsc_hub, 1);
if (ret) {
dev_err(&pdev->dev, "failed to init hub clock\n");
goto uninit_vdd;
}
ret = msm_hsic_hub_init_gpio(smsc_hub, 1);
if (ret) {
dev_err(&pdev->dev, "failed to init hub gpios\n");
goto uninit_clock;
}
gpio_direction_output(pdata->hub_reset, 0);
/*
* Hub reset should be asserted for minimum 2microsec
* before deasserting.
*/
udelay(5);
gpio_direction_output(pdata->hub_reset, 1);
if (!IS_ERR(smsc_hub->hub_vbus_reg)) {
ret = regulator_enable(smsc_hub->hub_vbus_reg);
if (ret) {
dev_err(&pdev->dev, "unable to enable hub_vbus\n");
goto uninit_gpio;
}
}
ret = i2c_add_driver(&hsic_hub_driver);
if (ret < 0) {
dev_err(&pdev->dev, "failed to add I2C hsic_hub_driver\n");
goto i2c_add_fail;
}
usleep_range(10000, 12000);
i2c_adap = i2c_get_adapter(SMSC_GSBI_I2C_BUS_ID);
if (!i2c_adap) {
dev_err(&pdev->dev, "failed to get i2c adapter\n");
i2c_del_driver(&hsic_hub_driver);
goto i2c_add_fail;
}
memset(&i2c_info, 0, sizeof(struct i2c_board_info));
strlcpy(i2c_info.type, "i2c_hsic_hub", I2C_NAME_SIZE);
/* 250ms delay is required for SMSC4604 HUB to get I2C up */
msleep(250);
/* Assign I2C slave address per SMSC model */
switch (pdata->model_id) {
case SMSC3503_ID:
normal_i2c[0] = SMSC3503_I2C_ADDR;
break;
case SMSC4604_ID:
normal_i2c[0] = SMSC4604_I2C_ADDR;
break;
default:
dev_err(&pdev->dev, "unsupported SMSC model-id\n");
i2c_put_adapter(i2c_adap);
i2c_del_driver(&hsic_hub_driver);
goto uninit_gpio;
}
smsc_hub->client = i2c_new_probed_device(i2c_adap, &i2c_info,
normal_i2c, NULL);
i2c_put_adapter(i2c_adap);
i2c_add_fail:
ret = of_platform_populate(node, NULL, hsic_host_auxdata, &pdev->dev);
if (ret) {
dev_err(&pdev->dev, "failed to add child node, ret=%d\n", ret);
goto uninit_gpio;
}
if (!smsc_hub->client)
dev_err(&pdev->dev,
"failed to connect to smsc_hub through I2C\n");
pm_runtime_set_active(&pdev->dev);
pm_runtime_enable(&pdev->dev);
return 0;
uninit_gpio:
msm_hsic_hub_init_gpio(smsc_hub, 0);
uninit_clock:
msm_hsic_hub_init_clock(smsc_hub, 0);
uninit_vdd:
msm_hsic_hub_init_vdd(smsc_hub, 0);
return ret;
}
static int smsc_hub_remove(struct platform_device *pdev)
{
const struct smsc_hub_platform_data *pdata;
pdata = smsc_hub->pdata;
if (smsc_hub->client) {
i2c_unregister_device(smsc_hub->client);
smsc_hub->client = NULL;
i2c_del_driver(&hsic_hub_driver);
}
pm_runtime_disable(&pdev->dev);
if (!IS_ERR(smsc_hub->hub_vbus_reg))
regulator_disable(smsc_hub->hub_vbus_reg);
msm_hsic_hub_init_gpio(smsc_hub, 0);
msm_hsic_hub_init_clock(smsc_hub, 0);
msm_hsic_hub_init_vdd(smsc_hub, 0);
return 0;
}
#ifdef CONFIG_PM_RUNTIME
static int msm_smsc_runtime_idle(struct device *dev)
{
dev_dbg(dev, "SMSC HUB runtime idle\n");
return 0;
}
static int smsc_hub_lpm_enter(struct device *dev)
{
int ret = 0;
if (smsc_hub->xo_handle) {
ret = msm_xo_mode_vote(smsc_hub->xo_handle, MSM_XO_MODE_OFF);
if (ret) {
pr_err("%s: failed to devote for TCXO\n"
"D1 buffer%d\n", __func__, ret);
}
}
return ret;
}
static int smsc_hub_lpm_exit(struct device *dev)
{
int ret = 0;
if (smsc_hub->xo_handle) {
ret = msm_xo_mode_vote(smsc_hub->xo_handle, MSM_XO_MODE_ON);
if (ret) {
pr_err("%s: failed to vote for TCXO\n"
"D1 buffer%d\n", __func__, ret);
}
}
return ret;
}
#endif
#ifdef CONFIG_PM
static const struct dev_pm_ops smsc_hub_dev_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(smsc_hub_lpm_enter, smsc_hub_lpm_exit)
SET_RUNTIME_PM_OPS(smsc_hub_lpm_enter, smsc_hub_lpm_exit,
msm_smsc_runtime_idle)
};
#endif
static const struct of_device_id hsic_hub_dt_match[] = {
{ .compatible = "qcom,hsic-smsc-hub",
},
{}
};
MODULE_DEVICE_TABLE(of, hsic_hub_dt_match);
static struct platform_driver smsc_hub_driver = {
.driver = {
.name = "msm_smsc_hub",
.owner = THIS_MODULE,
#ifdef CONFIG_PM
.pm = &smsc_hub_dev_pm_ops,
#endif
.of_match_table = hsic_hub_dt_match,
},
.probe = smsc_hub_probe,
.remove = smsc_hub_remove,
};
static int __init smsc_hub_init(void)
{
return platform_driver_register(&smsc_hub_driver);
}
static void __exit smsc_hub_exit(void)
{
platform_driver_unregister(&smsc_hub_driver);
}
subsys_initcall(smsc_hub_init);
module_exit(smsc_hub_exit);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("SMSC HSIC HUB driver");