1*77c129bfSVenkat Reddy Talla /* 2*77c129bfSVenkat Reddy Talla * TI TPS65132 Regulator driver 3*77c129bfSVenkat Reddy Talla * 4*77c129bfSVenkat Reddy Talla * Copyright (C) 2017 NVIDIA CORPORATION. All rights reserved. 5*77c129bfSVenkat Reddy Talla * 6*77c129bfSVenkat Reddy Talla * Author: Venkat Reddy Talla <vreddytalla@nvidia.com> 7*77c129bfSVenkat Reddy Talla * Laxman Dewangan <ldewangan@nvidia.com> 8*77c129bfSVenkat Reddy Talla * 9*77c129bfSVenkat Reddy Talla * This program is free software; you can redistribute it and/or 10*77c129bfSVenkat Reddy Talla * modify it under the terms of the GNU General Public License as 11*77c129bfSVenkat Reddy Talla * published by the Free Software Foundation; either version 2 of the 12*77c129bfSVenkat Reddy Talla * License, or (at your option) any later version. 13*77c129bfSVenkat Reddy Talla * 14*77c129bfSVenkat Reddy Talla * This program is distributed "as is" WITHOUT ANY WARRANTY of any kind, 15*77c129bfSVenkat Reddy Talla * whether express or implied; without even the implied warranty of 16*77c129bfSVenkat Reddy Talla * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 17*77c129bfSVenkat Reddy Talla * General Public License for more details. 18*77c129bfSVenkat Reddy Talla */ 19*77c129bfSVenkat Reddy Talla 20*77c129bfSVenkat Reddy Talla #include <linux/delay.h> 21*77c129bfSVenkat Reddy Talla #include <linux/err.h> 22*77c129bfSVenkat Reddy Talla #include <linux/gpio/consumer.h> 23*77c129bfSVenkat Reddy Talla #include <linux/i2c.h> 24*77c129bfSVenkat Reddy Talla #include <linux/module.h> 25*77c129bfSVenkat Reddy Talla #include <linux/regmap.h> 26*77c129bfSVenkat Reddy Talla #include <linux/regulator/driver.h> 27*77c129bfSVenkat Reddy Talla #include <linux/regulator/machine.h> 28*77c129bfSVenkat Reddy Talla 29*77c129bfSVenkat Reddy Talla #define TPS65132_REG_VPOS 0x00 30*77c129bfSVenkat Reddy Talla #define TPS65132_REG_VNEG 0x01 31*77c129bfSVenkat Reddy Talla #define TPS65132_REG_APPS_DISP_DISN 0x03 32*77c129bfSVenkat Reddy Talla #define TPS65132_REG_CONTROL 0x0FF 33*77c129bfSVenkat Reddy Talla 34*77c129bfSVenkat Reddy Talla #define TPS65132_VOUT_MASK 0x1F 35*77c129bfSVenkat Reddy Talla #define TPS65132_VOUT_N_VOLTAGE 0x15 36*77c129bfSVenkat Reddy Talla #define TPS65132_VOUT_VMIN 4000000 37*77c129bfSVenkat Reddy Talla #define TPS65132_VOUT_VMAX 6000000 38*77c129bfSVenkat Reddy Talla #define TPS65132_VOUT_STEP 100000 39*77c129bfSVenkat Reddy Talla 40*77c129bfSVenkat Reddy Talla #define TPS65132_REG_APPS_DIS_VPOS BIT(0) 41*77c129bfSVenkat Reddy Talla #define TPS65132_REG_APPS_DIS_VNEG BIT(1) 42*77c129bfSVenkat Reddy Talla 43*77c129bfSVenkat Reddy Talla #define TPS65132_REGULATOR_ID_VPOS 0 44*77c129bfSVenkat Reddy Talla #define TPS65132_REGULATOR_ID_VNEG 1 45*77c129bfSVenkat Reddy Talla #define TPS65132_MAX_REGULATORS 2 46*77c129bfSVenkat Reddy Talla 47*77c129bfSVenkat Reddy Talla #define TPS65132_ACT_DIS_TIME_SLACK 1000 48*77c129bfSVenkat Reddy Talla 49*77c129bfSVenkat Reddy Talla struct tps65132_reg_pdata { 50*77c129bfSVenkat Reddy Talla struct gpio_desc *en_gpiod; 51*77c129bfSVenkat Reddy Talla struct gpio_desc *act_dis_gpiod; 52*77c129bfSVenkat Reddy Talla unsigned int act_dis_time_us; 53*77c129bfSVenkat Reddy Talla int ena_gpio_state; 54*77c129bfSVenkat Reddy Talla }; 55*77c129bfSVenkat Reddy Talla 56*77c129bfSVenkat Reddy Talla struct tps65132_regulator { 57*77c129bfSVenkat Reddy Talla struct device *dev; 58*77c129bfSVenkat Reddy Talla struct regmap *rmap; 59*77c129bfSVenkat Reddy Talla struct regulator_desc *rdesc[TPS65132_MAX_REGULATORS]; 60*77c129bfSVenkat Reddy Talla struct tps65132_reg_pdata reg_pdata[TPS65132_MAX_REGULATORS]; 61*77c129bfSVenkat Reddy Talla struct regulator_dev *rdev[TPS65132_MAX_REGULATORS]; 62*77c129bfSVenkat Reddy Talla }; 63*77c129bfSVenkat Reddy Talla 64*77c129bfSVenkat Reddy Talla static int tps65132_regulator_enable(struct regulator_dev *rdev) 65*77c129bfSVenkat Reddy Talla { 66*77c129bfSVenkat Reddy Talla struct tps65132_regulator *tps = rdev_get_drvdata(rdev); 67*77c129bfSVenkat Reddy Talla int id = rdev_get_id(rdev); 68*77c129bfSVenkat Reddy Talla struct tps65132_reg_pdata *rpdata = &tps->reg_pdata[id]; 69*77c129bfSVenkat Reddy Talla int ret; 70*77c129bfSVenkat Reddy Talla 71*77c129bfSVenkat Reddy Talla if (!IS_ERR(rpdata->en_gpiod)) { 72*77c129bfSVenkat Reddy Talla gpiod_set_value_cansleep(rpdata->en_gpiod, 1); 73*77c129bfSVenkat Reddy Talla rpdata->ena_gpio_state = 1; 74*77c129bfSVenkat Reddy Talla } 75*77c129bfSVenkat Reddy Talla 76*77c129bfSVenkat Reddy Talla /* Hardware automatically enable discharge bit in enable */ 77*77c129bfSVenkat Reddy Talla if (rdev->constraints->active_discharge == 78*77c129bfSVenkat Reddy Talla REGULATOR_ACTIVE_DISCHARGE_DISABLE) { 79*77c129bfSVenkat Reddy Talla ret = regulator_set_active_discharge_regmap(rdev, false); 80*77c129bfSVenkat Reddy Talla if (ret < 0) { 81*77c129bfSVenkat Reddy Talla dev_err(tps->dev, "Failed to disable active discharge: %d\n", 82*77c129bfSVenkat Reddy Talla ret); 83*77c129bfSVenkat Reddy Talla return ret; 84*77c129bfSVenkat Reddy Talla } 85*77c129bfSVenkat Reddy Talla } 86*77c129bfSVenkat Reddy Talla 87*77c129bfSVenkat Reddy Talla return 0; 88*77c129bfSVenkat Reddy Talla } 89*77c129bfSVenkat Reddy Talla 90*77c129bfSVenkat Reddy Talla static int tps65132_regulator_disable(struct regulator_dev *rdev) 91*77c129bfSVenkat Reddy Talla { 92*77c129bfSVenkat Reddy Talla struct tps65132_regulator *tps = rdev_get_drvdata(rdev); 93*77c129bfSVenkat Reddy Talla int id = rdev_get_id(rdev); 94*77c129bfSVenkat Reddy Talla struct tps65132_reg_pdata *rpdata = &tps->reg_pdata[id]; 95*77c129bfSVenkat Reddy Talla 96*77c129bfSVenkat Reddy Talla if (!IS_ERR(rpdata->en_gpiod)) { 97*77c129bfSVenkat Reddy Talla gpiod_set_value_cansleep(rpdata->en_gpiod, 0); 98*77c129bfSVenkat Reddy Talla rpdata->ena_gpio_state = 0; 99*77c129bfSVenkat Reddy Talla } 100*77c129bfSVenkat Reddy Talla 101*77c129bfSVenkat Reddy Talla if (!IS_ERR(rpdata->act_dis_gpiod)) { 102*77c129bfSVenkat Reddy Talla gpiod_set_value_cansleep(rpdata->act_dis_gpiod, 1); 103*77c129bfSVenkat Reddy Talla usleep_range(rpdata->act_dis_time_us, rpdata->act_dis_time_us + 104*77c129bfSVenkat Reddy Talla TPS65132_ACT_DIS_TIME_SLACK); 105*77c129bfSVenkat Reddy Talla gpiod_set_value_cansleep(rpdata->act_dis_gpiod, 0); 106*77c129bfSVenkat Reddy Talla } 107*77c129bfSVenkat Reddy Talla 108*77c129bfSVenkat Reddy Talla return 0; 109*77c129bfSVenkat Reddy Talla } 110*77c129bfSVenkat Reddy Talla 111*77c129bfSVenkat Reddy Talla static int tps65132_regulator_is_enabled(struct regulator_dev *rdev) 112*77c129bfSVenkat Reddy Talla { 113*77c129bfSVenkat Reddy Talla struct tps65132_regulator *tps = rdev_get_drvdata(rdev); 114*77c129bfSVenkat Reddy Talla int id = rdev_get_id(rdev); 115*77c129bfSVenkat Reddy Talla struct tps65132_reg_pdata *rpdata = &tps->reg_pdata[id]; 116*77c129bfSVenkat Reddy Talla 117*77c129bfSVenkat Reddy Talla if (!IS_ERR(rpdata->en_gpiod)) 118*77c129bfSVenkat Reddy Talla return rpdata->ena_gpio_state; 119*77c129bfSVenkat Reddy Talla 120*77c129bfSVenkat Reddy Talla return 1; 121*77c129bfSVenkat Reddy Talla } 122*77c129bfSVenkat Reddy Talla 123*77c129bfSVenkat Reddy Talla static struct regulator_ops tps65132_regulator_ops = { 124*77c129bfSVenkat Reddy Talla .enable = tps65132_regulator_enable, 125*77c129bfSVenkat Reddy Talla .disable = tps65132_regulator_disable, 126*77c129bfSVenkat Reddy Talla .is_enabled = tps65132_regulator_is_enabled, 127*77c129bfSVenkat Reddy Talla .list_voltage = regulator_list_voltage_linear, 128*77c129bfSVenkat Reddy Talla .map_voltage = regulator_map_voltage_linear, 129*77c129bfSVenkat Reddy Talla .get_voltage_sel = regulator_get_voltage_sel_regmap, 130*77c129bfSVenkat Reddy Talla .set_voltage_sel = regulator_set_voltage_sel_regmap, 131*77c129bfSVenkat Reddy Talla .set_active_discharge = regulator_set_active_discharge_regmap, 132*77c129bfSVenkat Reddy Talla }; 133*77c129bfSVenkat Reddy Talla 134*77c129bfSVenkat Reddy Talla static int tps65132_of_parse_cb(struct device_node *np, 135*77c129bfSVenkat Reddy Talla const struct regulator_desc *desc, 136*77c129bfSVenkat Reddy Talla struct regulator_config *config) 137*77c129bfSVenkat Reddy Talla { 138*77c129bfSVenkat Reddy Talla struct tps65132_regulator *tps = config->driver_data; 139*77c129bfSVenkat Reddy Talla struct tps65132_reg_pdata *rpdata = &tps->reg_pdata[desc->id]; 140*77c129bfSVenkat Reddy Talla int ret; 141*77c129bfSVenkat Reddy Talla 142*77c129bfSVenkat Reddy Talla rpdata->en_gpiod = devm_fwnode_get_index_gpiod_from_child(tps->dev, 143*77c129bfSVenkat Reddy Talla "enable", 0, &np->fwnode, 0, "enable"); 144*77c129bfSVenkat Reddy Talla if (IS_ERR(rpdata->en_gpiod)) { 145*77c129bfSVenkat Reddy Talla ret = PTR_ERR(rpdata->en_gpiod); 146*77c129bfSVenkat Reddy Talla 147*77c129bfSVenkat Reddy Talla /* Ignore the error other than probe defer */ 148*77c129bfSVenkat Reddy Talla if (ret == -EPROBE_DEFER) 149*77c129bfSVenkat Reddy Talla return ret; 150*77c129bfSVenkat Reddy Talla return 0; 151*77c129bfSVenkat Reddy Talla } 152*77c129bfSVenkat Reddy Talla 153*77c129bfSVenkat Reddy Talla rpdata->act_dis_gpiod = devm_fwnode_get_index_gpiod_from_child( 154*77c129bfSVenkat Reddy Talla tps->dev, "active-discharge", 0, 155*77c129bfSVenkat Reddy Talla &np->fwnode, 0, "active-discharge"); 156*77c129bfSVenkat Reddy Talla if (IS_ERR(rpdata->act_dis_gpiod)) { 157*77c129bfSVenkat Reddy Talla ret = PTR_ERR(rpdata->act_dis_gpiod); 158*77c129bfSVenkat Reddy Talla 159*77c129bfSVenkat Reddy Talla /* Ignore the error other than probe defer */ 160*77c129bfSVenkat Reddy Talla if (ret == -EPROBE_DEFER) 161*77c129bfSVenkat Reddy Talla return ret; 162*77c129bfSVenkat Reddy Talla 163*77c129bfSVenkat Reddy Talla return 0; 164*77c129bfSVenkat Reddy Talla } 165*77c129bfSVenkat Reddy Talla 166*77c129bfSVenkat Reddy Talla ret = of_property_read_u32(np, "ti,active-discharge-time-us", 167*77c129bfSVenkat Reddy Talla &rpdata->act_dis_time_us); 168*77c129bfSVenkat Reddy Talla if (ret < 0) { 169*77c129bfSVenkat Reddy Talla dev_err(tps->dev, "Failed to read active discharge time:%d\n", 170*77c129bfSVenkat Reddy Talla ret); 171*77c129bfSVenkat Reddy Talla return ret; 172*77c129bfSVenkat Reddy Talla } 173*77c129bfSVenkat Reddy Talla 174*77c129bfSVenkat Reddy Talla return 0; 175*77c129bfSVenkat Reddy Talla } 176*77c129bfSVenkat Reddy Talla 177*77c129bfSVenkat Reddy Talla #define TPS65132_REGULATOR_DESC(_id, _name) \ 178*77c129bfSVenkat Reddy Talla [TPS65132_REGULATOR_ID_##_id] = { \ 179*77c129bfSVenkat Reddy Talla .name = "tps65132-"#_name, \ 180*77c129bfSVenkat Reddy Talla .supply_name = "vin", \ 181*77c129bfSVenkat Reddy Talla .id = TPS65132_REGULATOR_ID_##_id, \ 182*77c129bfSVenkat Reddy Talla .of_match = of_match_ptr(#_name), \ 183*77c129bfSVenkat Reddy Talla .of_parse_cb = tps65132_of_parse_cb, \ 184*77c129bfSVenkat Reddy Talla .ops = &tps65132_regulator_ops, \ 185*77c129bfSVenkat Reddy Talla .n_voltages = TPS65132_VOUT_N_VOLTAGE, \ 186*77c129bfSVenkat Reddy Talla .min_uV = TPS65132_VOUT_VMIN, \ 187*77c129bfSVenkat Reddy Talla .uV_step = TPS65132_VOUT_STEP, \ 188*77c129bfSVenkat Reddy Talla .enable_time = 500, \ 189*77c129bfSVenkat Reddy Talla .vsel_mask = TPS65132_VOUT_MASK, \ 190*77c129bfSVenkat Reddy Talla .vsel_reg = TPS65132_REG_##_id, \ 191*77c129bfSVenkat Reddy Talla .active_discharge_off = 0, \ 192*77c129bfSVenkat Reddy Talla .active_discharge_on = TPS65132_REG_APPS_DIS_##_id, \ 193*77c129bfSVenkat Reddy Talla .active_discharge_mask = TPS65132_REG_APPS_DIS_##_id, \ 194*77c129bfSVenkat Reddy Talla .active_discharge_reg = TPS65132_REG_APPS_DISP_DISN, \ 195*77c129bfSVenkat Reddy Talla .type = REGULATOR_VOLTAGE, \ 196*77c129bfSVenkat Reddy Talla .owner = THIS_MODULE, \ 197*77c129bfSVenkat Reddy Talla } 198*77c129bfSVenkat Reddy Talla 199*77c129bfSVenkat Reddy Talla static struct regulator_desc tps_regs_desc[TPS65132_MAX_REGULATORS] = { 200*77c129bfSVenkat Reddy Talla TPS65132_REGULATOR_DESC(VPOS, outp), 201*77c129bfSVenkat Reddy Talla TPS65132_REGULATOR_DESC(VNEG, outn), 202*77c129bfSVenkat Reddy Talla }; 203*77c129bfSVenkat Reddy Talla 204*77c129bfSVenkat Reddy Talla static const struct regmap_range tps65132_no_reg_ranges[] = { 205*77c129bfSVenkat Reddy Talla regmap_reg_range(TPS65132_REG_APPS_DISP_DISN + 1, 206*77c129bfSVenkat Reddy Talla TPS65132_REG_CONTROL - 1), 207*77c129bfSVenkat Reddy Talla }; 208*77c129bfSVenkat Reddy Talla 209*77c129bfSVenkat Reddy Talla static const struct regmap_access_table tps65132_no_reg_table = { 210*77c129bfSVenkat Reddy Talla .no_ranges = tps65132_no_reg_ranges, 211*77c129bfSVenkat Reddy Talla .n_no_ranges = ARRAY_SIZE(tps65132_no_reg_ranges), 212*77c129bfSVenkat Reddy Talla }; 213*77c129bfSVenkat Reddy Talla 214*77c129bfSVenkat Reddy Talla static const struct regmap_config tps65132_regmap_config = { 215*77c129bfSVenkat Reddy Talla .reg_bits = 8, 216*77c129bfSVenkat Reddy Talla .val_bits = 8, 217*77c129bfSVenkat Reddy Talla .max_register = TPS65132_REG_CONTROL + 1, 218*77c129bfSVenkat Reddy Talla .cache_type = REGCACHE_NONE, 219*77c129bfSVenkat Reddy Talla .rd_table = &tps65132_no_reg_table, 220*77c129bfSVenkat Reddy Talla .wr_table = &tps65132_no_reg_table, 221*77c129bfSVenkat Reddy Talla }; 222*77c129bfSVenkat Reddy Talla 223*77c129bfSVenkat Reddy Talla static int tps65132_probe(struct i2c_client *client, 224*77c129bfSVenkat Reddy Talla const struct i2c_device_id *client_id) 225*77c129bfSVenkat Reddy Talla { 226*77c129bfSVenkat Reddy Talla struct device *dev = &client->dev; 227*77c129bfSVenkat Reddy Talla struct tps65132_regulator *tps; 228*77c129bfSVenkat Reddy Talla struct regulator_config config = { }; 229*77c129bfSVenkat Reddy Talla int id; 230*77c129bfSVenkat Reddy Talla int ret; 231*77c129bfSVenkat Reddy Talla 232*77c129bfSVenkat Reddy Talla tps = devm_kzalloc(dev, sizeof(*tps), GFP_KERNEL); 233*77c129bfSVenkat Reddy Talla if (!tps) 234*77c129bfSVenkat Reddy Talla return -ENOMEM; 235*77c129bfSVenkat Reddy Talla 236*77c129bfSVenkat Reddy Talla tps->rmap = devm_regmap_init_i2c(client, &tps65132_regmap_config); 237*77c129bfSVenkat Reddy Talla if (IS_ERR(tps->rmap)) { 238*77c129bfSVenkat Reddy Talla ret = PTR_ERR(tps->rmap); 239*77c129bfSVenkat Reddy Talla dev_err(dev, "regmap init failed: %d\n", ret); 240*77c129bfSVenkat Reddy Talla return ret; 241*77c129bfSVenkat Reddy Talla } 242*77c129bfSVenkat Reddy Talla 243*77c129bfSVenkat Reddy Talla i2c_set_clientdata(client, tps); 244*77c129bfSVenkat Reddy Talla tps->dev = dev; 245*77c129bfSVenkat Reddy Talla 246*77c129bfSVenkat Reddy Talla for (id = 0; id < TPS65132_MAX_REGULATORS; ++id) { 247*77c129bfSVenkat Reddy Talla tps->rdesc[id] = &tps_regs_desc[id]; 248*77c129bfSVenkat Reddy Talla 249*77c129bfSVenkat Reddy Talla config.regmap = tps->rmap; 250*77c129bfSVenkat Reddy Talla config.dev = dev; 251*77c129bfSVenkat Reddy Talla config.driver_data = tps; 252*77c129bfSVenkat Reddy Talla 253*77c129bfSVenkat Reddy Talla tps->rdev[id] = devm_regulator_register(dev, 254*77c129bfSVenkat Reddy Talla tps->rdesc[id], &config); 255*77c129bfSVenkat Reddy Talla if (IS_ERR(tps->rdev[id])) { 256*77c129bfSVenkat Reddy Talla ret = PTR_ERR(tps->rdev[id]); 257*77c129bfSVenkat Reddy Talla dev_err(dev, "regulator %s register failed: %d\n", 258*77c129bfSVenkat Reddy Talla tps->rdesc[id]->name, ret); 259*77c129bfSVenkat Reddy Talla return ret; 260*77c129bfSVenkat Reddy Talla } 261*77c129bfSVenkat Reddy Talla } 262*77c129bfSVenkat Reddy Talla return 0; 263*77c129bfSVenkat Reddy Talla } 264*77c129bfSVenkat Reddy Talla 265*77c129bfSVenkat Reddy Talla static const struct i2c_device_id tps65132_id[] = { 266*77c129bfSVenkat Reddy Talla {.name = "tps65132",}, 267*77c129bfSVenkat Reddy Talla {}, 268*77c129bfSVenkat Reddy Talla }; 269*77c129bfSVenkat Reddy Talla MODULE_DEVICE_TABLE(i2c, tps65132_id); 270*77c129bfSVenkat Reddy Talla 271*77c129bfSVenkat Reddy Talla static struct i2c_driver tps65132_i2c_driver = { 272*77c129bfSVenkat Reddy Talla .driver = { 273*77c129bfSVenkat Reddy Talla .name = "tps65132", 274*77c129bfSVenkat Reddy Talla .owner = THIS_MODULE, 275*77c129bfSVenkat Reddy Talla }, 276*77c129bfSVenkat Reddy Talla .probe = tps65132_probe, 277*77c129bfSVenkat Reddy Talla .id_table = tps65132_id, 278*77c129bfSVenkat Reddy Talla }; 279*77c129bfSVenkat Reddy Talla 280*77c129bfSVenkat Reddy Talla module_i2c_driver(tps65132_i2c_driver); 281*77c129bfSVenkat Reddy Talla 282*77c129bfSVenkat Reddy Talla MODULE_DESCRIPTION("tps65132 regulator driver"); 283*77c129bfSVenkat Reddy Talla MODULE_AUTHOR("Venkat Reddy Talla <vreddytalla@nvidia.com>"); 284*77c129bfSVenkat Reddy Talla MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>"); 285*77c129bfSVenkat Reddy Talla MODULE_LICENSE("GPL v2"); 286