/* * LP8755 High Performance Power Management Unit : System Interface Driver * (based on rev. 0.26) * Copyright 2012 Texas Instruments * * Author: Daniel(Geon Si) Jeong <daniel.jeong@ti.com> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * */ #include <linux/module.h> #include <linux/slab.h> #include <linux/i2c.h> #include <linux/err.h> #include <linux/irq.h> #include <linux/interrupt.h> #include <linux/gpio.h> #include <linux/regmap.h> #include <linux/uaccess.h> #include <linux/regulator/driver.h> #include <linux/regulator/machine.h> #include <linux/platform_data/lp8755.h> #define LP8755_REG_BUCK0 0x00 #define LP8755_REG_BUCK1 0x03 #define LP8755_REG_BUCK2 0x04 #define LP8755_REG_BUCK3 0x01 #define LP8755_REG_BUCK4 0x05 #define LP8755_REG_BUCK5 0x02 #define LP8755_REG_MAX 0xFF #define LP8755_BUCK_EN_M BIT(7) #define LP8755_BUCK_LINEAR_OUT_MAX 0x76 #define LP8755_BUCK_VOUT_M 0x7F struct lp8755_mphase { int nreg; int buck_num[LP8755_BUCK_MAX]; }; struct lp8755_chip { struct device *dev; struct regmap *regmap; struct lp8755_platform_data *pdata; int irq; unsigned int irqmask; int mphase; struct regulator_dev *rdev[LP8755_BUCK_MAX]; }; /** *lp8755_read : read a single register value from lp8755. *@pchip : device to read from *@reg : register to read from *@val : pointer to store read value */ static int lp8755_read(struct lp8755_chip *pchip, unsigned int reg, unsigned int *val) { return regmap_read(pchip->regmap, reg, val); } /** *lp8755_write : write a single register value to lp8755. *@pchip : device to write to *@reg : register to write to *@val : value to be written */ static int lp8755_write(struct lp8755_chip *pchip, unsigned int reg, unsigned int val) { return regmap_write(pchip->regmap, reg, val); } /** *lp8755_update_bits : set the values of bit fields in lp8755 register. *@pchip : device to read from *@reg : register to update *@mask : bitmask to be changed *@val : value for bitmask */ static int lp8755_update_bits(struct lp8755_chip *pchip, unsigned int reg, unsigned int mask, unsigned int val) { return regmap_update_bits(pchip->regmap, reg, mask, val); } static int lp8755_buck_enable_time(struct regulator_dev *rdev) { int ret; unsigned int regval; enum lp8755_bucks id = rdev_get_id(rdev); struct lp8755_chip *pchip = rdev_get_drvdata(rdev); ret = lp8755_read(pchip, 0x12 + id, ®val); if (ret < 0) { dev_err(pchip->dev, "i2c acceess error %s\n", __func__); return ret; } return (regval & 0xff) * 100; } static int lp8755_buck_set_mode(struct regulator_dev *rdev, unsigned int mode) { int ret; unsigned int regbval = 0x0; enum lp8755_bucks id = rdev_get_id(rdev); struct lp8755_chip *pchip = rdev_get_drvdata(rdev); switch (mode) { case REGULATOR_MODE_FAST: /* forced pwm mode */ regbval = (0x01 << id); break; case REGULATOR_MODE_NORMAL: /* enable automatic pwm/pfm mode */ ret = lp8755_update_bits(pchip, 0x08 + id, 0x20, 0x00); if (ret < 0) goto err_i2c; break; case REGULATOR_MODE_IDLE: /* enable automatic pwm/pfm/lppfm mode */ ret = lp8755_update_bits(pchip, 0x08 + id, 0x20, 0x20); if (ret < 0) goto err_i2c; ret = lp8755_update_bits(pchip, 0x10, 0x01, 0x01); if (ret < 0) goto err_i2c; break; default: dev_err(pchip->dev, "Not supported buck mode %s\n", __func__); /* forced pwm mode */ regbval = (0x01 << id); } ret = lp8755_update_bits(pchip, 0x06, 0x01 << id, regbval); if (ret < 0) goto err_i2c; return ret; err_i2c: dev_err(pchip->dev, "i2c acceess error %s\n", __func__); return ret; } static unsigned int lp8755_buck_get_mode(struct regulator_dev *rdev) { int ret; unsigned int regval; enum lp8755_bucks id = rdev_get_id(rdev); struct lp8755_chip *pchip = rdev_get_drvdata(rdev); ret = lp8755_read(pchip, 0x06, ®val); if (ret < 0) goto err_i2c; /* mode fast means forced pwm mode */ if (regval & (0x01 << id)) return REGULATOR_MODE_FAST; ret = lp8755_read(pchip, 0x08 + id, ®val); if (ret < 0) goto err_i2c; /* mode idle means automatic pwm/pfm/lppfm mode */ if (regval & 0x20) return REGULATOR_MODE_IDLE; /* mode normal means automatic pwm/pfm mode */ return REGULATOR_MODE_NORMAL; err_i2c: dev_err(pchip->dev, "i2c acceess error %s\n", __func__); return 0; } static int lp8755_buck_set_ramp(struct regulator_dev *rdev, int ramp) { int ret; unsigned int regval = 0x00; enum lp8755_bucks id = rdev_get_id(rdev); struct lp8755_chip *pchip = rdev_get_drvdata(rdev); /* uV/us */ switch (ramp) { case 0 ... 230: regval = 0x07; break; case 231 ... 470: regval = 0x06; break; case 471 ... 940: regval = 0x05; break; case 941 ... 1900: regval = 0x04; break; case 1901 ... 3800: regval = 0x03; break; case 3801 ... 7500: regval = 0x02; break; case 7501 ... 15000: regval = 0x01; break; case 15001 ... 30000: regval = 0x00; break; default: dev_err(pchip->dev, "Not supported ramp value %d %s\n", ramp, __func__); return -EINVAL; } ret = lp8755_update_bits(pchip, 0x07 + id, 0x07, regval); if (ret < 0) goto err_i2c; return ret; err_i2c: dev_err(pchip->dev, "i2c acceess error %s\n", __func__); return ret; } static struct regulator_ops lp8755_buck_ops = { .map_voltage = regulator_map_voltage_linear, .list_voltage = regulator_list_voltage_linear, .set_voltage_sel = regulator_set_voltage_sel_regmap, .get_voltage_sel = regulator_get_voltage_sel_regmap, .enable = regulator_enable_regmap, .disable = regulator_disable_regmap, .is_enabled = regulator_is_enabled_regmap, .enable_time = lp8755_buck_enable_time, .set_mode = lp8755_buck_set_mode, .get_mode = lp8755_buck_get_mode, .set_ramp_delay = lp8755_buck_set_ramp, }; #define lp8755_rail(_id) "lp8755_buck"#_id #define lp8755_buck_init(_id)\ {\ .constraints = {\ .name = lp8755_rail(_id),\ .valid_ops_mask = REGULATOR_CHANGE_VOLTAGE,\ .min_uV = 500000,\ .max_uV = 1675000,\ },\ } static struct regulator_init_data lp8755_reg_default[LP8755_BUCK_MAX] = { [LP8755_BUCK0] = lp8755_buck_init(0), [LP8755_BUCK1] = lp8755_buck_init(1), [LP8755_BUCK2] = lp8755_buck_init(2), [LP8755_BUCK3] = lp8755_buck_init(3), [LP8755_BUCK4] = lp8755_buck_init(4), [LP8755_BUCK5] = lp8755_buck_init(5), }; static const struct lp8755_mphase mphase_buck[MPHASE_CONF_MAX] = { { 3, { LP8755_BUCK0, LP8755_BUCK3, LP8755_BUCK5 } }, { 6, { LP8755_BUCK0, LP8755_BUCK1, LP8755_BUCK2, LP8755_BUCK3, LP8755_BUCK4, LP8755_BUCK5 } }, { 5, { LP8755_BUCK0, LP8755_BUCK2, LP8755_BUCK3, LP8755_BUCK4, LP8755_BUCK5} }, { 4, { LP8755_BUCK0, LP8755_BUCK3, LP8755_BUCK4, LP8755_BUCK5} }, { 3, { LP8755_BUCK0, LP8755_BUCK4, LP8755_BUCK5} }, { 2, { LP8755_BUCK0, LP8755_BUCK5} }, { 1, { LP8755_BUCK0} }, { 2, { LP8755_BUCK0, LP8755_BUCK3} }, { 4, { LP8755_BUCK0, LP8755_BUCK2, LP8755_BUCK3, LP8755_BUCK5} }, }; static int lp8755_init_data(struct lp8755_chip *pchip) { unsigned int regval; int ret, icnt, buck_num; struct lp8755_platform_data *pdata = pchip->pdata; /* read back muti-phase configuration */ ret = lp8755_read(pchip, 0x3D, ®val); if (ret < 0) goto out_i2c_error; pchip->mphase = regval & 0x0F; /* set default data based on multi-phase config */ for (icnt = 0; icnt < mphase_buck[pchip->mphase].nreg; icnt++) { buck_num = mphase_buck[pchip->mphase].buck_num[icnt]; pdata->buck_data[buck_num] = &lp8755_reg_default[buck_num]; } return ret; out_i2c_error: dev_err(pchip->dev, "i2c acceess error %s\n", __func__); return ret; } #define lp8755_buck_desc(_id)\ {\ .name = lp8755_rail(_id),\ .id = LP8755_BUCK##_id,\ .ops = &lp8755_buck_ops,\ .n_voltages = LP8755_BUCK_LINEAR_OUT_MAX+1,\ .uV_step = 10000,\ .min_uV = 500000,\ .type = REGULATOR_VOLTAGE,\ .owner = THIS_MODULE,\ .enable_reg = LP8755_REG_BUCK##_id,\ .enable_mask = LP8755_BUCK_EN_M,\ .vsel_reg = LP8755_REG_BUCK##_id,\ .vsel_mask = LP8755_BUCK_VOUT_M,\ } static struct regulator_desc lp8755_regulators[] = { lp8755_buck_desc(0), lp8755_buck_desc(1), lp8755_buck_desc(2), lp8755_buck_desc(3), lp8755_buck_desc(4), lp8755_buck_desc(5), }; static int lp8755_regulator_init(struct lp8755_chip *pchip) { int ret, icnt, buck_num; struct lp8755_platform_data *pdata = pchip->pdata; struct regulator_config rconfig = { }; rconfig.regmap = pchip->regmap; rconfig.dev = pchip->dev; rconfig.driver_data = pchip; for (icnt = 0; icnt < mphase_buck[pchip->mphase].nreg; icnt++) { buck_num = mphase_buck[pchip->mphase].buck_num[icnt]; rconfig.init_data = pdata->buck_data[buck_num]; rconfig.of_node = pchip->dev->of_node; pchip->rdev[buck_num] = devm_regulator_register(pchip->dev, &lp8755_regulators[buck_num], &rconfig); if (IS_ERR(pchip->rdev[buck_num])) { ret = PTR_ERR(pchip->rdev[buck_num]); pchip->rdev[buck_num] = NULL; dev_err(pchip->dev, "regulator init failed: buck %d\n", buck_num); return ret; } } return 0; } static irqreturn_t lp8755_irq_handler(int irq, void *data) { int ret, icnt; unsigned int flag0, flag1; struct lp8755_chip *pchip = data; /* read flag0 register */ ret = lp8755_read(pchip, 0x0D, &flag0); if (ret < 0) goto err_i2c; /* clear flag register to pull up int. pin */ ret = lp8755_write(pchip, 0x0D, 0x00); if (ret < 0) goto err_i2c; /* sent power fault detection event to specific regulator */ for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++) if ((flag0 & (0x4 << icnt)) && (pchip->irqmask & (0x04 << icnt)) && (pchip->rdev[icnt] != NULL)) regulator_notifier_call_chain(pchip->rdev[icnt], LP8755_EVENT_PWR_FAULT, NULL); /* read flag1 register */ ret = lp8755_read(pchip, 0x0E, &flag1); if (ret < 0) goto err_i2c; /* clear flag register to pull up int. pin */ ret = lp8755_write(pchip, 0x0E, 0x00); if (ret < 0) goto err_i2c; /* send OCP event to all regualtor devices */ if ((flag1 & 0x01) && (pchip->irqmask & 0x01)) for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++) if (pchip->rdev[icnt] != NULL) regulator_notifier_call_chain(pchip->rdev[icnt], LP8755_EVENT_OCP, NULL); /* send OVP event to all regualtor devices */ if ((flag1 & 0x02) && (pchip->irqmask & 0x02)) for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++) if (pchip->rdev[icnt] != NULL) regulator_notifier_call_chain(pchip->rdev[icnt], LP8755_EVENT_OVP, NULL); return IRQ_HANDLED; err_i2c: dev_err(pchip->dev, "i2c acceess error %s\n", __func__); return IRQ_NONE; } static int lp8755_int_config(struct lp8755_chip *pchip) { int ret; unsigned int regval; if (pchip->irq == 0) { dev_warn(pchip->dev, "not use interrupt : %s\n", __func__); return 0; } ret = lp8755_read(pchip, 0x0F, ®val); if (ret < 0) goto err_i2c; pchip->irqmask = regval; ret = request_threaded_irq(pchip->irq, NULL, lp8755_irq_handler, IRQF_TRIGGER_FALLING | IRQF_ONESHOT, "lp8755-irq", pchip); if (ret) return ret; return ret; err_i2c: dev_err(pchip->dev, "i2c acceess error %s\n", __func__); return ret; } static const struct regmap_config lp8755_regmap = { .reg_bits = 8, .val_bits = 8, .max_register = LP8755_REG_MAX, }; static int lp8755_probe(struct i2c_client *client, const struct i2c_device_id *id) { int ret, icnt; struct lp8755_chip *pchip; struct lp8755_platform_data *pdata = dev_get_platdata(&client->dev); if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) { dev_err(&client->dev, "i2c functionality check fail.\n"); return -EOPNOTSUPP; } pchip = devm_kzalloc(&client->dev, sizeof(struct lp8755_chip), GFP_KERNEL); if (!pchip) return -ENOMEM; pchip->dev = &client->dev; pchip->regmap = devm_regmap_init_i2c(client, &lp8755_regmap); if (IS_ERR(pchip->regmap)) { ret = PTR_ERR(pchip->regmap); dev_err(&client->dev, "fail to allocate regmap %d\n", ret); return ret; } i2c_set_clientdata(client, pchip); if (pdata != NULL) { pchip->pdata = pdata; pchip->mphase = pdata->mphase; } else { pchip->pdata = devm_kzalloc(pchip->dev, sizeof(struct lp8755_platform_data), GFP_KERNEL); if (!pchip->pdata) return -ENOMEM; ret = lp8755_init_data(pchip); if (ret < 0) { dev_err(&client->dev, "fail to initialize chip\n"); return ret; } } ret = lp8755_regulator_init(pchip); if (ret < 0) { dev_err(&client->dev, "fail to initialize regulators\n"); goto err; } pchip->irq = client->irq; ret = lp8755_int_config(pchip); if (ret < 0) { dev_err(&client->dev, "fail to irq config\n"); goto err; } return ret; err: /* output disable */ for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++) lp8755_write(pchip, icnt, 0x00); return ret; } static int lp8755_remove(struct i2c_client *client) { int icnt; struct lp8755_chip *pchip = i2c_get_clientdata(client); for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++) lp8755_write(pchip, icnt, 0x00); if (pchip->irq != 0) free_irq(pchip->irq, pchip); return 0; } static const struct i2c_device_id lp8755_id[] = { {LP8755_NAME, 0}, {} }; MODULE_DEVICE_TABLE(i2c, lp8755_id); static struct i2c_driver lp8755_i2c_driver = { .driver = { .name = LP8755_NAME, }, .probe = lp8755_probe, .remove = lp8755_remove, .id_table = lp8755_id, }; static int __init lp8755_init(void) { return i2c_add_driver(&lp8755_i2c_driver); } subsys_initcall(lp8755_init); static void __exit lp8755_exit(void) { i2c_del_driver(&lp8755_i2c_driver); } module_exit(lp8755_exit); MODULE_DESCRIPTION("Texas Instruments lp8755 driver"); MODULE_AUTHOR("Daniel Jeong <daniel.jeong@ti.com>"); MODULE_LICENSE("GPL v2");