| /* 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"); |