1 /* 2 * extcon-axp288.c - X-Power AXP288 PMIC extcon cable detection driver 3 * 4 * Copyright (C) 2015 Intel Corporation 5 * Author: Ramakrishna Pallala <ramakrishna.pallala@intel.com> 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License version 2 as 9 * published by the Free Software Foundation. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 */ 16 17 #include <linux/module.h> 18 #include <linux/kernel.h> 19 #include <linux/io.h> 20 #include <linux/slab.h> 21 #include <linux/interrupt.h> 22 #include <linux/platform_device.h> 23 #include <linux/property.h> 24 #include <linux/notifier.h> 25 #include <linux/extcon.h> 26 #include <linux/regmap.h> 27 #include <linux/gpio.h> 28 #include <linux/gpio/consumer.h> 29 #include <linux/mfd/axp20x.h> 30 31 /* Power source status register */ 32 #define PS_STAT_VBUS_TRIGGER BIT(0) 33 #define PS_STAT_BAT_CHRG_DIR BIT(2) 34 #define PS_STAT_VBUS_ABOVE_VHOLD BIT(3) 35 #define PS_STAT_VBUS_VALID BIT(4) 36 #define PS_STAT_VBUS_PRESENT BIT(5) 37 38 /* BC module global register */ 39 #define BC_GLOBAL_RUN BIT(0) 40 #define BC_GLOBAL_DET_STAT BIT(2) 41 #define BC_GLOBAL_DBP_TOUT BIT(3) 42 #define BC_GLOBAL_VLGC_COM_SEL BIT(4) 43 #define BC_GLOBAL_DCD_TOUT_MASK (BIT(6)|BIT(5)) 44 #define BC_GLOBAL_DCD_TOUT_300MS 0 45 #define BC_GLOBAL_DCD_TOUT_100MS 1 46 #define BC_GLOBAL_DCD_TOUT_500MS 2 47 #define BC_GLOBAL_DCD_TOUT_900MS 3 48 #define BC_GLOBAL_DCD_DET_SEL BIT(7) 49 50 /* BC module vbus control and status register */ 51 #define VBUS_CNTL_DPDM_PD_EN BIT(4) 52 #define VBUS_CNTL_DPDM_FD_EN BIT(5) 53 #define VBUS_CNTL_FIRST_PO_STAT BIT(6) 54 55 /* BC USB status register */ 56 #define USB_STAT_BUS_STAT_MASK (BIT(3)|BIT(2)|BIT(1)|BIT(0)) 57 #define USB_STAT_BUS_STAT_SHIFT 0 58 #define USB_STAT_BUS_STAT_ATHD 0 59 #define USB_STAT_BUS_STAT_CONN 1 60 #define USB_STAT_BUS_STAT_SUSP 2 61 #define USB_STAT_BUS_STAT_CONF 3 62 #define USB_STAT_USB_SS_MODE BIT(4) 63 #define USB_STAT_DEAD_BAT_DET BIT(6) 64 #define USB_STAT_DBP_UNCFG BIT(7) 65 66 /* BC detect status register */ 67 #define DET_STAT_MASK (BIT(7)|BIT(6)|BIT(5)) 68 #define DET_STAT_SHIFT 5 69 #define DET_STAT_SDP 1 70 #define DET_STAT_CDP 2 71 #define DET_STAT_DCP 3 72 73 enum axp288_extcon_reg { 74 AXP288_PS_STAT_REG = 0x00, 75 AXP288_PS_BOOT_REASON_REG = 0x02, 76 AXP288_BC_GLOBAL_REG = 0x2c, 77 AXP288_BC_VBUS_CNTL_REG = 0x2d, 78 AXP288_BC_USB_STAT_REG = 0x2e, 79 AXP288_BC_DET_STAT_REG = 0x2f, 80 }; 81 82 enum axp288_mux_select { 83 EXTCON_GPIO_MUX_SEL_PMIC = 0, 84 EXTCON_GPIO_MUX_SEL_SOC, 85 }; 86 87 enum axp288_extcon_irq { 88 VBUS_FALLING_IRQ = 0, 89 VBUS_RISING_IRQ, 90 MV_CHNG_IRQ, 91 BC_USB_CHNG_IRQ, 92 EXTCON_IRQ_END, 93 }; 94 95 static const unsigned int axp288_extcon_cables[] = { 96 EXTCON_CHG_USB_SDP, 97 EXTCON_CHG_USB_CDP, 98 EXTCON_CHG_USB_DCP, 99 EXTCON_USB, 100 EXTCON_NONE, 101 }; 102 103 struct axp288_extcon_info { 104 struct device *dev; 105 struct regmap *regmap; 106 struct regmap_irq_chip_data *regmap_irqc; 107 struct gpio_desc *gpio_mux_cntl; 108 int irq[EXTCON_IRQ_END]; 109 struct extcon_dev *edev; 110 struct notifier_block extcon_nb; 111 unsigned int previous_cable; 112 }; 113 114 /* Power up/down reason string array */ 115 static char *axp288_pwr_up_down_info[] = { 116 "Last wake caused by user pressing the power button", 117 "Last wake caused by a charger insertion", 118 "Last wake caused by a battery insertion", 119 "Last wake caused by SOC initiated global reset", 120 "Last wake caused by cold reset", 121 "Last shutdown caused by PMIC UVLO threshold", 122 "Last shutdown caused by SOC initiated cold off", 123 "Last shutdown caused by user pressing the power button", 124 NULL, 125 }; 126 127 /* 128 * Decode and log the given "reset source indicator" (rsi) 129 * register and then clear it. 130 */ 131 static void axp288_extcon_log_rsi(struct axp288_extcon_info *info) 132 { 133 char **rsi; 134 unsigned int val, i, clear_mask = 0; 135 int ret; 136 137 ret = regmap_read(info->regmap, AXP288_PS_BOOT_REASON_REG, &val); 138 for (i = 0, rsi = axp288_pwr_up_down_info; *rsi; rsi++, i++) { 139 if (val & BIT(i)) { 140 dev_dbg(info->dev, "%s\n", *rsi); 141 clear_mask |= BIT(i); 142 } 143 } 144 145 /* Clear the register value for next reboot (write 1 to clear bit) */ 146 regmap_write(info->regmap, AXP288_PS_BOOT_REASON_REG, clear_mask); 147 } 148 149 static int axp288_handle_chrg_det_event(struct axp288_extcon_info *info) 150 { 151 int ret, stat, cfg, pwr_stat; 152 u8 chrg_type; 153 unsigned int cable = info->previous_cable; 154 bool vbus_attach = false; 155 156 ret = regmap_read(info->regmap, AXP288_PS_STAT_REG, &pwr_stat); 157 if (ret < 0) { 158 dev_err(info->dev, "failed to read vbus status\n"); 159 return ret; 160 } 161 162 vbus_attach = (pwr_stat & PS_STAT_VBUS_VALID); 163 if (!vbus_attach) 164 goto no_vbus; 165 166 /* Check charger detection completion status */ 167 ret = regmap_read(info->regmap, AXP288_BC_GLOBAL_REG, &cfg); 168 if (ret < 0) 169 goto dev_det_ret; 170 if (cfg & BC_GLOBAL_DET_STAT) { 171 dev_dbg(info->dev, "can't complete the charger detection\n"); 172 goto dev_det_ret; 173 } 174 175 ret = regmap_read(info->regmap, AXP288_BC_DET_STAT_REG, &stat); 176 if (ret < 0) 177 goto dev_det_ret; 178 179 chrg_type = (stat & DET_STAT_MASK) >> DET_STAT_SHIFT; 180 181 switch (chrg_type) { 182 case DET_STAT_SDP: 183 dev_dbg(info->dev, "sdp cable is connected\n"); 184 cable = EXTCON_CHG_USB_SDP; 185 break; 186 case DET_STAT_CDP: 187 dev_dbg(info->dev, "cdp cable is connected\n"); 188 cable = EXTCON_CHG_USB_CDP; 189 break; 190 case DET_STAT_DCP: 191 dev_dbg(info->dev, "dcp cable is connected\n"); 192 cable = EXTCON_CHG_USB_DCP; 193 break; 194 default: 195 dev_warn(info->dev, 196 "disconnect or unknown or ID event\n"); 197 } 198 199 no_vbus: 200 /* 201 * If VBUS is absent Connect D+/D- lines to PMIC for BC 202 * detection. Else connect them to SOC for USB communication. 203 */ 204 if (info->gpio_mux_cntl) 205 gpiod_set_value(info->gpio_mux_cntl, 206 vbus_attach ? EXTCON_GPIO_MUX_SEL_SOC 207 : EXTCON_GPIO_MUX_SEL_PMIC); 208 209 extcon_set_state_sync(info->edev, info->previous_cable, false); 210 if (info->previous_cable == EXTCON_CHG_USB_SDP) 211 extcon_set_state_sync(info->edev, EXTCON_USB, false); 212 213 if (vbus_attach) { 214 extcon_set_state_sync(info->edev, cable, vbus_attach); 215 if (cable == EXTCON_CHG_USB_SDP) 216 extcon_set_state_sync(info->edev, EXTCON_USB, 217 vbus_attach); 218 219 info->previous_cable = cable; 220 } 221 222 return 0; 223 224 dev_det_ret: 225 if (ret < 0) 226 dev_err(info->dev, "failed to detect BC Mod\n"); 227 228 return ret; 229 } 230 231 static irqreturn_t axp288_extcon_isr(int irq, void *data) 232 { 233 struct axp288_extcon_info *info = data; 234 int ret; 235 236 ret = axp288_handle_chrg_det_event(info); 237 if (ret < 0) 238 dev_err(info->dev, "failed to handle the interrupt\n"); 239 240 return IRQ_HANDLED; 241 } 242 243 static void axp288_extcon_enable(struct axp288_extcon_info *info) 244 { 245 regmap_update_bits(info->regmap, AXP288_BC_GLOBAL_REG, 246 BC_GLOBAL_RUN, 0); 247 /* Enable the charger detection logic */ 248 regmap_update_bits(info->regmap, AXP288_BC_GLOBAL_REG, 249 BC_GLOBAL_RUN, BC_GLOBAL_RUN); 250 } 251 252 static int axp288_extcon_probe(struct platform_device *pdev) 253 { 254 struct axp288_extcon_info *info; 255 struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent); 256 struct axp288_extcon_pdata *pdata = pdev->dev.platform_data; 257 int ret, i, pirq, gpio; 258 259 info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL); 260 if (!info) 261 return -ENOMEM; 262 263 info->dev = &pdev->dev; 264 info->regmap = axp20x->regmap; 265 info->regmap_irqc = axp20x->regmap_irqc; 266 info->previous_cable = EXTCON_NONE; 267 if (pdata) 268 info->gpio_mux_cntl = pdata->gpio_mux_cntl; 269 270 platform_set_drvdata(pdev, info); 271 272 axp288_extcon_log_rsi(info); 273 274 /* Initialize extcon device */ 275 info->edev = devm_extcon_dev_allocate(&pdev->dev, 276 axp288_extcon_cables); 277 if (IS_ERR(info->edev)) { 278 dev_err(&pdev->dev, "failed to allocate memory for extcon\n"); 279 return PTR_ERR(info->edev); 280 } 281 282 /* Register extcon device */ 283 ret = devm_extcon_dev_register(&pdev->dev, info->edev); 284 if (ret) { 285 dev_err(&pdev->dev, "failed to register extcon device\n"); 286 return ret; 287 } 288 289 /* Set up gpio control for USB Mux */ 290 if (info->gpio_mux_cntl) { 291 gpio = desc_to_gpio(info->gpio_mux_cntl); 292 ret = devm_gpio_request(&pdev->dev, gpio, "USB_MUX"); 293 if (ret < 0) { 294 dev_err(&pdev->dev, 295 "failed to request the gpio=%d\n", gpio); 296 return ret; 297 } 298 gpiod_direction_output(info->gpio_mux_cntl, 299 EXTCON_GPIO_MUX_SEL_PMIC); 300 } 301 302 for (i = 0; i < EXTCON_IRQ_END; i++) { 303 pirq = platform_get_irq(pdev, i); 304 info->irq[i] = regmap_irq_get_virq(info->regmap_irqc, pirq); 305 if (info->irq[i] < 0) { 306 dev_err(&pdev->dev, 307 "failed to get virtual interrupt=%d\n", pirq); 308 ret = info->irq[i]; 309 return ret; 310 } 311 312 ret = devm_request_threaded_irq(&pdev->dev, info->irq[i], 313 NULL, axp288_extcon_isr, 314 IRQF_ONESHOT | IRQF_NO_SUSPEND, 315 pdev->name, info); 316 if (ret) { 317 dev_err(&pdev->dev, "failed to request interrupt=%d\n", 318 info->irq[i]); 319 return ret; 320 } 321 } 322 323 /* Start charger cable type detection */ 324 axp288_extcon_enable(info); 325 326 return 0; 327 } 328 329 static const struct platform_device_id axp288_extcon_table[] = { 330 { .name = "axp288_extcon" }, 331 {}, 332 }; 333 MODULE_DEVICE_TABLE(platform, axp288_extcon_table); 334 335 static struct platform_driver axp288_extcon_driver = { 336 .probe = axp288_extcon_probe, 337 .id_table = axp288_extcon_table, 338 .driver = { 339 .name = "axp288_extcon", 340 }, 341 }; 342 module_platform_driver(axp288_extcon_driver); 343 344 MODULE_AUTHOR("Ramakrishna Pallala <ramakrishna.pallala@intel.com>"); 345 MODULE_DESCRIPTION("X-Powers AXP288 extcon driver"); 346 MODULE_LICENSE("GPL v2"); 347