/* * Copyright (C) 2010-2012 Freescale Semiconductor, Inc. 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 as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * 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. * You should have received a copy of the GNU General Public License along * with this program; if not, write to the Free Software Foundation, Inc., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ #include #include #include #include #include #include #include #include #include #include #include #include #include /* * Regulator definitions * *_MIN_uV - minimum microvolt for regulator * *_MAX_uV - maximum microvolt for regulator * *_STEP_uV - microvolts between regulator output levels * *_MIN_VAL - minimum register field value for regulator * *_MAX_VAL - maximum register field value for regulator */ #define MAX17135_HVINP_MIN_uV 5000000 #define MAX17135_HVINP_MAX_uV 20000000 #define MAX17135_HVINP_STEP_uV 1000000 #define MAX17135_HVINP_MIN_VAL 0 #define MAX17135_HVINP_MAX_VAL 1 #define MAX17135_HVINN_MIN_uV 5000000 #define MAX17135_HVINN_MAX_uV 20000000 #define MAX17135_HVINN_STEP_uV 1000000 #define MAX17135_HVINN_MIN_VAL 0 #define MAX17135_HVINN_MAX_VAL 1 #define MAX17135_GVDD_MIN_uV 5000000 #define MAX17135_GVDD_MAX_uV 20000000 #define MAX17135_GVDD_STEP_uV 1000000 #define MAX17135_GVDD_MIN_VAL 0 #define MAX17135_GVDD_MAX_VAL 1 #define MAX17135_GVEE_MIN_uV 5000000 #define MAX17135_GVEE_MAX_uV 20000000 #define MAX17135_GVEE_STEP_uV 1000000 #define MAX17135_GVEE_MIN_VAL 0 #define MAX17135_GVEE_MAX_VAL 1 #define MAX17135_VCOM_MIN_VAL 0 #define MAX17135_VCOM_MAX_VAL 255 #define MAX17135_VNEG_MIN_uV 5000000 #define MAX17135_VNEG_MAX_uV 20000000 #define MAX17135_VNEG_STEP_uV 1000000 #define MAX17135_VNEG_MIN_VAL 0 #define MAX17135_VNEG_MAX_VAL 1 #define MAX17135_VPOS_MIN_uV 5000000 #define MAX17135_VPOS_MAX_uV 20000000 #define MAX17135_VPOS_STEP_uV 1000000 #define MAX17135_VPOS_MIN_VAL 0 #define MAX17135_VPOS_MAX_VAL 1 struct max17135_vcom_programming_data { int vcom_min_uV; int vcom_max_uV; int vcom_step_uV; }; static long unsigned int max17135_pass_num = { 1 }; static int max17135_vcom = { -1250000 }; struct max17135_vcom_programming_data vcom_data[2] = { { -4325000, -500000, 15000, }, { -3050000, -500000, 10000, }, }; static int max17135_is_power_good(struct max17135 *max17135); /* * Regulator operations */ static int max17135_hvinp_set_voltage(struct regulator_dev *reg, int minuV, int uV, unsigned *selector) { unsigned int reg_val; unsigned int fld_val; if ((uV >= MAX17135_HVINP_MIN_uV) && (uV <= MAX17135_HVINP_MAX_uV)) fld_val = (uV - MAX17135_HVINP_MIN_uV) / MAX17135_HVINP_STEP_uV; else return -EINVAL; max17135_reg_read(REG_MAX17135_HVINP, ®_val); reg_val &= ~BITFMASK(HVINP); reg_val |= BITFVAL(HVINP, fld_val); /* shift to correct bit */ return max17135_reg_write(REG_MAX17135_HVINP, reg_val); } static int max17135_hvinp_get_voltage(struct regulator_dev *reg) { unsigned int reg_val; unsigned int fld_val; int volt; max17135_reg_read(REG_MAX17135_HVINP, ®_val); fld_val = (reg_val & BITFMASK(HVINP)) >> HVINP_LSH; if ((fld_val >= MAX17135_HVINP_MIN_VAL) && (fld_val <= MAX17135_HVINP_MAX_VAL)) { volt = (fld_val * MAX17135_HVINP_STEP_uV) + MAX17135_HVINP_MIN_uV; } else { printk(KERN_ERR "MAX17135: HVINP voltage is out of range\n"); volt = 0; } return volt; } static int max17135_hvinp_enable(struct regulator_dev *reg) { return 0; } static int max17135_hvinp_disable(struct regulator_dev *reg) { return 0; } /* Convert uV to the VCOM register bitfield setting */ static inline int vcom_uV_to_rs(int uV, int pass_num) { return (vcom_data[pass_num].vcom_max_uV - uV) / vcom_data[pass_num].vcom_step_uV; } /* Convert the VCOM register bitfield setting to uV */ static inline int vcom_rs_to_uV(int rs, int pass_num) { return vcom_data[pass_num].vcom_max_uV - (vcom_data[pass_num].vcom_step_uV * rs); } static int max17135_vcom_set_voltage(struct regulator_dev *reg, int minuV, int uV, unsigned *selector) { struct max17135 *max17135 = rdev_get_drvdata(reg); unsigned int reg_val; int vcom_read; if ((uV < vcom_data[max17135->pass_num-1].vcom_min_uV) || (uV > vcom_data[max17135->pass_num-1].vcom_max_uV)) return -EINVAL; max17135_reg_read(REG_MAX17135_DVR, ®_val); /* * Only program VCOM if it is not set to the desired value. * Programming VCOM excessively degrades ability to keep * DVR register value persistent. */ vcom_read = vcom_rs_to_uV(reg_val, max17135->pass_num-1); if (vcom_read != max17135->vcom_uV) { reg_val &= ~BITFMASK(DVR); reg_val |= BITFVAL(DVR, vcom_uV_to_rs(uV, max17135->pass_num-1)); max17135_reg_write(REG_MAX17135_DVR, reg_val); reg_val = BITFVAL(CTRL_DVR, true); /* shift to correct bit */ return max17135_reg_write(REG_MAX17135_PRGM_CTRL, reg_val); } return 0; } static int max17135_vcom_get_voltage(struct regulator_dev *reg) { struct max17135 *max17135 = rdev_get_drvdata(reg); unsigned int reg_val; max17135_reg_read(REG_MAX17135_DVR, ®_val); return vcom_rs_to_uV(BITFEXT(reg_val, DVR), max17135->pass_num-1); } static int max17135_vcom_enable(struct regulator_dev *reg) { struct max17135 *max17135 = rdev_get_drvdata(reg); /* * Check to see if we need to set the VCOM voltage. * Should only be done one time. And, we can * only change vcom voltage if we have been enabled. */ if (!max17135->vcom_setup && max17135_is_power_good(max17135)) { max17135_vcom_set_voltage(reg, max17135->vcom_uV, max17135->vcom_uV, NULL); max17135->vcom_setup = true; } /* enable VCOM regulator output */ if (max17135->pass_num == 1) gpio_set_value(max17135->gpio_pmic_vcom_ctrl, 1); else { unsigned int reg_val; max17135_reg_read(REG_MAX17135_ENABLE, ®_val); reg_val &= ~BITFMASK(VCOM_ENABLE); reg_val |= BITFVAL(VCOM_ENABLE, 1); /* shift to correct bit */ max17135_reg_write(REG_MAX17135_ENABLE, reg_val); } return 0; } static int max17135_vcom_disable(struct regulator_dev *reg) { struct max17135 *max17135 = rdev_get_drvdata(reg); if (max17135->pass_num == 1) gpio_set_value(max17135->gpio_pmic_vcom_ctrl, 0); else { unsigned int reg_val; max17135_reg_read(REG_MAX17135_ENABLE, ®_val); reg_val &= ~BITFMASK(VCOM_ENABLE); max17135_reg_write(REG_MAX17135_ENABLE, reg_val); } return 0; } static int max17135_vcom_is_enabled(struct regulator_dev *reg) { struct max17135 *max17135 = rdev_get_drvdata(reg); /* read VCOM regulator enable setting */ if (max17135->pass_num == 1) { int gpio = gpio_get_value(max17135->gpio_pmic_vcom_ctrl); if (gpio == 0) return 0; else return 1; } else { unsigned int reg_val; max17135_reg_read(REG_MAX17135_ENABLE, ®_val); reg_val &= BITFMASK(VCOM_ENABLE); if (reg_val != 0) return 1; else return 0; } } static int max17135_is_power_good(struct max17135 *max17135) { unsigned int reg_val; unsigned int fld_val; max17135_reg_read(REG_MAX17135_FAULT, ®_val); fld_val = (reg_val & BITFMASK(FAULT_POK)) >> FAULT_POK_LSH; /* Check the POK bit */ return fld_val; } static int max17135_wait_power_good(struct max17135 *max17135) { int i; for (i = 0; i < max17135->max_wait * 3; i++) { if (max17135_is_power_good(max17135)) return 0; msleep(1); } return -ETIMEDOUT; } static int max17135_display_enable(struct regulator_dev *reg) { struct max17135 *max17135 = rdev_get_drvdata(reg); /* The Pass 1 parts cannot turn on the PMIC via I2C. */ if (max17135->pass_num == 1) gpio_set_value(max17135->gpio_pmic_wakeup, 1); else { unsigned int reg_val; max17135_reg_read(REG_MAX17135_ENABLE, ®_val); reg_val &= ~BITFMASK(ENABLE); reg_val |= BITFVAL(ENABLE, 1); max17135_reg_write(REG_MAX17135_ENABLE, reg_val); } return max17135_wait_power_good(max17135); } static int max17135_display_disable(struct regulator_dev *reg) { struct max17135 *max17135 = rdev_get_drvdata(reg); if (max17135->pass_num == 1) gpio_set_value(max17135->gpio_pmic_wakeup, 0); else { unsigned int reg_val; max17135_reg_read(REG_MAX17135_ENABLE, ®_val); reg_val &= ~BITFMASK(ENABLE); max17135_reg_write(REG_MAX17135_ENABLE, reg_val); } msleep(max17135->max_wait); return 0; } static int max17135_display_is_enabled(struct regulator_dev *reg) { struct max17135 *max17135 = rdev_get_drvdata(reg); int gpio = gpio_get_value(max17135->gpio_pmic_wakeup); if (gpio == 0) return 0; else return 1; } static int max17135_v3p3_enable(struct regulator_dev *reg) { struct max17135 *max17135 = rdev_get_drvdata(reg); gpio_set_value(max17135->gpio_pmic_v3p3, 1); return 0; } static int max17135_v3p3_disable(struct regulator_dev *reg) { struct max17135 *max17135 = rdev_get_drvdata(reg); gpio_set_value(max17135->gpio_pmic_v3p3, 0); return 0; } static int max17135_v3p3_is_enabled(struct regulator_dev *reg) { struct max17135 *max17135 = rdev_get_drvdata(reg); int gpio = gpio_get_value(max17135->gpio_pmic_v3p3); if (gpio == 0) return 0; else return 1; } /* * Regulator operations */ static struct regulator_ops max17135_display_ops = { .enable = max17135_display_enable, .disable = max17135_display_disable, .is_enabled = max17135_display_is_enabled, }; static struct regulator_ops max17135_gvdd_ops = { }; static struct regulator_ops max17135_gvee_ops = { }; static struct regulator_ops max17135_hvinn_ops = { }; static struct regulator_ops max17135_hvinp_ops = { .enable = max17135_hvinp_enable, .disable = max17135_hvinp_disable, .get_voltage = max17135_hvinp_get_voltage, .set_voltage = max17135_hvinp_set_voltage, }; static struct regulator_ops max17135_vcom_ops = { .enable = max17135_vcom_enable, .disable = max17135_vcom_disable, .get_voltage = max17135_vcom_get_voltage, .set_voltage = max17135_vcom_set_voltage, .is_enabled = max17135_vcom_is_enabled, }; static struct regulator_ops max17135_vneg_ops = { }; static struct regulator_ops max17135_vpos_ops = { }; static struct regulator_ops max17135_v3p3_ops = { .enable = max17135_v3p3_enable, .disable = max17135_v3p3_disable, .is_enabled = max17135_v3p3_is_enabled, }; /* * Regulator descriptors */ static struct regulator_desc max17135_reg[MAX17135_NUM_REGULATORS] = { { .name = "DISPLAY", .id = MAX17135_DISPLAY, .ops = &max17135_display_ops, .type = REGULATOR_VOLTAGE, .owner = THIS_MODULE, }, { .name = "GVDD", .id = MAX17135_GVDD, .ops = &max17135_gvdd_ops, .type = REGULATOR_VOLTAGE, .owner = THIS_MODULE, }, { .name = "GVEE", .id = MAX17135_GVEE, .ops = &max17135_gvee_ops, .type = REGULATOR_VOLTAGE, .owner = THIS_MODULE, }, { .name = "HVINN", .id = MAX17135_HVINN, .ops = &max17135_hvinn_ops, .type = REGULATOR_VOLTAGE, .owner = THIS_MODULE, }, { .name = "HVINP", .id = MAX17135_HVINP, .ops = &max17135_hvinp_ops, .type = REGULATOR_VOLTAGE, .owner = THIS_MODULE, }, { .name = "VCOM", .id = MAX17135_VCOM, .ops = &max17135_vcom_ops, .type = REGULATOR_VOLTAGE, .owner = THIS_MODULE, }, { .name = "VNEG", .id = MAX17135_VNEG, .ops = &max17135_vneg_ops, .type = REGULATOR_VOLTAGE, .owner = THIS_MODULE, }, { .name = "VPOS", .id = MAX17135_VPOS, .ops = &max17135_vpos_ops, .type = REGULATOR_VOLTAGE, .owner = THIS_MODULE, }, { .name = "V3P3", .id = MAX17135_V3P3, .ops = &max17135_v3p3_ops, .type = REGULATOR_VOLTAGE, .owner = THIS_MODULE, }, }; static void max17135_setup_timings(struct max17135 *max17135) { unsigned int reg_val; int timing1, timing2, timing3, timing4, timing5, timing6, timing7, timing8; max17135_reg_read(REG_MAX17135_TIMING1, &timing1); max17135_reg_read(REG_MAX17135_TIMING2, &timing2); max17135_reg_read(REG_MAX17135_TIMING3, &timing3); max17135_reg_read(REG_MAX17135_TIMING4, &timing4); max17135_reg_read(REG_MAX17135_TIMING5, &timing5); max17135_reg_read(REG_MAX17135_TIMING6, &timing6); max17135_reg_read(REG_MAX17135_TIMING7, &timing7); max17135_reg_read(REG_MAX17135_TIMING8, &timing8); if ((timing1 != max17135->gvee_pwrup) || (timing2 != max17135->vneg_pwrup) || (timing3 != max17135->vpos_pwrup) || (timing4 != max17135->gvdd_pwrup) || (timing5 != max17135->gvdd_pwrdn) || (timing6 != max17135->vpos_pwrdn) || (timing7 != max17135->vneg_pwrdn) || (timing8 != max17135->gvee_pwrdn)) { max17135_reg_write(REG_MAX17135_TIMING1, max17135->gvee_pwrup); max17135_reg_write(REG_MAX17135_TIMING2, max17135->vneg_pwrup); max17135_reg_write(REG_MAX17135_TIMING3, max17135->vpos_pwrup); max17135_reg_write(REG_MAX17135_TIMING4, max17135->gvdd_pwrup); max17135_reg_write(REG_MAX17135_TIMING5, max17135->gvdd_pwrdn); max17135_reg_write(REG_MAX17135_TIMING6, max17135->vpos_pwrdn); max17135_reg_write(REG_MAX17135_TIMING7, max17135->vneg_pwrdn); max17135_reg_write(REG_MAX17135_TIMING8, max17135->gvee_pwrdn); reg_val = BITFVAL(CTRL_TIMING, true); /* shift to correct bit */ max17135_reg_write(REG_MAX17135_PRGM_CTRL, reg_val); } } /* * Regulator init/probing/exit functions */ static int max17135_regulator_probe(struct platform_device *pdev) { struct regulator_dev *rdev; rdev = regulator_register(&max17135_reg[pdev->id], &pdev->dev, pdev->dev.platform_data, dev_get_drvdata(&pdev->dev)); if (IS_ERR(rdev)) { dev_err(&pdev->dev, "failed to register %s\n", max17135_reg[pdev->id].name); return PTR_ERR(rdev); } return 0; } static int max17135_regulator_remove(struct platform_device *pdev) { struct regulator_dev *rdev = platform_get_drvdata(pdev); regulator_unregister(rdev); return 0; } static struct platform_driver max17135_regulator_driver = { .probe = max17135_regulator_probe, .remove = max17135_regulator_remove, .driver = { .name = "max17135-reg", }, }; int max17135_register_regulator(struct max17135 *max17135, int reg, struct regulator_init_data *initdata) { struct platform_device *pdev; int ret; struct i2c_client *client = max17135->i2c_client; /* If we can't find PMIC via I2C, we should not register regulators */ if (i2c_smbus_read_byte_data(client, REG_MAX17135_PRODUCT_REV) != 0) { dev_err(max17135->dev, "Max17135 PMIC not found!\n"); return -ENXIO; } if (max17135->pdev[reg]) return -EBUSY; pdev = platform_device_alloc("max17135-reg", reg); if (!pdev) return -ENOMEM; max17135->pdev[reg] = pdev; initdata->driver_data = max17135; pdev->dev.platform_data = initdata; pdev->dev.parent = max17135->dev; platform_set_drvdata(pdev, max17135); ret = platform_device_add(pdev); if (ret != 0) { dev_err(max17135->dev, "Failed to register regulator %d: %d\n", reg, ret); platform_device_del(pdev); max17135->pdev[reg] = NULL; } if (!max17135->init_done) { max17135->pass_num = max17135_pass_num; max17135->vcom_uV = max17135_vcom; /* * Set up PMIC timing values. * Should only be done one time! Timing values may only be * changed a limited number of times according to spec. */ max17135_setup_timings(max17135); max17135->init_done = true; } return ret; } static int __init max17135_regulator_init(void) { return platform_driver_register(&max17135_regulator_driver); } subsys_initcall(max17135_regulator_init); static void __exit max17135_regulator_exit(void) { platform_driver_unregister(&max17135_regulator_driver); } module_exit(max17135_regulator_exit); /* * Parse user specified options (`max17135:') * example: * max17135:pass=2,vcom=-1250000 */ static int __init max17135_setup(char *options) { int ret; char *opt; while ((opt = strsep(&options, ",")) != NULL) { if (!*opt) continue; if (!strncmp(opt, "pass=", 5)) { ret = strict_strtoul(opt + 5, 0, &max17135_pass_num); if (ret < 0) return ret; } if (!strncmp(opt, "vcom=", 5)) { int offs = 5; if (opt[5] == '-') offs = 6; ret = strict_strtoul(opt + offs, 0, (long *)&max17135_vcom); if (ret < 0) return ret; max17135_vcom = -max17135_vcom; } } return 1; } __setup("max17135:", max17135_setup); /* Module information */ MODULE_DESCRIPTION("MAX17135 regulator driver"); MODULE_LICENSE("GPL");