arch/arm/mach-sa1100/collie_pm.c

   1 /*
   2  * Based on spitz_pm.c and sharp code.
   3  *
   4  * Copyright (C) 2001  SHARP
   5  * Copyright 2005 Pavel Machek <pavel@suse.cz>
   6  *
   7  * Distribute under GPLv2.
   8  *
   9  * Li-ion batteries are angry beasts, and they like to explode. This driver is not finished,
  10  * and sometimes charges them when it should not. If it makes angry lithium to come your way...
  11  * ...well, you have been warned.
  12  *
  13  * Actually, this should be quite safe, it seems sharp leaves charger enabled by default,
  14  * and my collie did not explode (yet).
  15  */
  16
  17 #include <linux/module.h>
  18 #include <linux/stat.h>
  19 #include <linux/init.h>
  20 #include <linux/kernel.h>
  21 #include <linux/delay.h>
  22 #include <linux/interrupt.h>
  23 #include <linux/device.h>
  24 #include <linux/platform_device.h>
  25
  26 #include <asm/irq.h>
  27 #include <asm/mach-types.h>
  28 #include <asm/hardware.h>
  29 #include <asm/hardware/scoop.h>
  30 #include <asm/dma.h>
  31 #include <asm/arch/collie.h>
  32 #include <asm/mach/sharpsl_param.h>
  33 #include <asm/hardware/sharpsl_pm.h>
  34
  35 #include "../drivers/mfd/ucb1x00.h"
  36
  37 static struct ucb1x00 *ucb;
  38 static int ad_revise;
  39
  40 #define ADCtoPower(x)          ((330 * x * 2) / 1024)
  41
  42 static void collie_charger_init(void)
  43 {
  44         int err;
  45
  46         if (sharpsl_param.adadj != -1)
  47                 ad_revise = sharpsl_param.adadj;
  48
  49         /* Register interrupt handler. */
  50         if ((err = request_irq(COLLIE_IRQ_GPIO_AC_IN, sharpsl_ac_isr, IRQF_DISABLED,
  51                                "ACIN", sharpsl_ac_isr))) {
  52                 printk("Could not get irq %d.\n", COLLIE_IRQ_GPIO_AC_IN);
  53                 return;
  54         }
  55         if ((err = request_irq(COLLIE_IRQ_GPIO_CO, sharpsl_chrg_full_isr, IRQF_DISABLED,
  56                                "CO", sharpsl_chrg_full_isr))) {
  57                 free_irq(COLLIE_IRQ_GPIO_AC_IN, sharpsl_ac_isr);
  58                 printk("Could not get irq %d.\n", COLLIE_IRQ_GPIO_CO);
  59                 return;
  60         }
  61
  62         ucb1x00_io_set_dir(ucb, 0, COLLIE_TC35143_GPIO_MBAT_ON | COLLIE_TC35143_GPIO_TMP_ON |
  63                                    COLLIE_TC35143_GPIO_BBAT_ON);
  64         return;
  65 }
  66
  67 static void collie_measure_temp(int on)
  68 {
  69         if (on)
  70                 ucb1x00_io_write(ucb, COLLIE_TC35143_GPIO_TMP_ON, 0);
  71         else
  72                 ucb1x00_io_write(ucb, 0, COLLIE_TC35143_GPIO_TMP_ON);
  73 }
  74
  75 static void collie_charge(int on)
  76 {
  77         extern struct platform_device colliescoop_device;
  78
  79         /* Zaurus seems to contain LTC1731; it should know when to
  80          * stop charging itself, so setting charge on should be
  81          * relatively harmless (as long as it is not done too often).
  82          */
  83         if (on) {
  84                 set_scoop_gpio(&colliescoop_device.dev, COLLIE_SCP_CHARGE_ON);
  85         } else {
  86                 reset_scoop_gpio(&colliescoop_device.dev, COLLIE_SCP_CHARGE_ON);
  87         }
  88 }
  89
  90 static void collie_discharge(int on)
  91 {
  92 }
  93
  94 static void collie_discharge1(int on)
  95 {
  96 }
  97
  98 static void collie_presuspend(void)
  99 {
 100 }
 101
 102 static void collie_postsuspend(void)
 103 {
 104 }
 105
 106 static int collie_should_wakeup(unsigned int resume_on_alarm)
 107 {
 108         return 0;
 109 }
 110
 111 static unsigned long collie_charger_wakeup(void)
 112 {
 113         return 0;
 114 }
 115
 116 int collie_read_backup_battery(void)
 117 {
 118         int voltage;
 119
 120         ucb1x00_adc_enable(ucb);
 121
 122         ucb1x00_io_write(ucb, COLLIE_TC35143_GPIO_BBAT_ON, 0);
 123         voltage = ucb1x00_adc_read(ucb, UCB_ADC_INP_AD1, UCB_SYNC);
 124
 125         ucb1x00_io_write(ucb, 0, COLLIE_TC35143_GPIO_BBAT_ON);
 126         ucb1x00_adc_disable(ucb);
 127
 128         printk("Backup battery = %d(%d)\n", ADCtoPower(voltage), voltage);
 129
 130         return ADCtoPower(voltage);
 131 }
 132
 133 int collie_read_main_battery(void)
 134 {
 135         int voltage, voltage_rev, voltage_volts;
 136
 137         ucb1x00_adc_enable(ucb);
 138         ucb1x00_io_write(ucb, 0, COLLIE_TC35143_GPIO_BBAT_ON);
 139         ucb1x00_io_write(ucb, COLLIE_TC35143_GPIO_MBAT_ON, 0);
 140
 141         mdelay(1);
 142         voltage = ucb1x00_adc_read(ucb, UCB_ADC_INP_AD1, UCB_SYNC);
 143
 144         ucb1x00_io_write(ucb, 0, COLLIE_TC35143_GPIO_MBAT_ON);
 145         ucb1x00_adc_disable(ucb);
 146
 147         voltage_rev = voltage + ((ad_revise * voltage) / 652);
 148         voltage_volts = ADCtoPower(voltage_rev);
 149
 150         printk("Main battery = %d(%d)\n", voltage_volts, voltage);
 151
 152         if (voltage != -1)
 153                 return voltage_volts;
 154         else
 155                 return voltage;
 156 }
 157
 158 int collie_read_temp(void)
 159 {
 160         int voltage;
 161
 162         /* According to Sharp, temp must be > 973, main battery must be < 465,
 163            FIXME: sharpsl_pm.c has both conditions negated? FIXME: values
 164            are way out of range? */
 165
 166         ucb1x00_adc_enable(ucb);
 167         ucb1x00_io_write(ucb, COLLIE_TC35143_GPIO_TMP_ON, 0);
 168         /* >1010 = battery removed, 460 = 22C ?, higher = lower temp ? */
 169         voltage = ucb1x00_adc_read(ucb, UCB_ADC_INP_AD0, UCB_SYNC);
 170         ucb1x00_io_write(ucb, 0, COLLIE_TC35143_GPIO_TMP_ON);
 171         ucb1x00_adc_disable(ucb);
 172
 173         printk("Battery temp = %d\n", voltage);
 174         return voltage;
 175 }
 176
 177 static unsigned long read_devdata(int which)
 178 {
 179         switch (which) {
 180         case SHARPSL_BATT_VOLT:
 181                 return collie_read_main_battery();
 182         case SHARPSL_BATT_TEMP:
 183                 return collie_read_temp();
 184         case SHARPSL_ACIN_VOLT:
 185                 return 500;
 186         case SHARPSL_STATUS_ACIN: {
 187                 int ret = GPLR & COLLIE_GPIO_AC_IN;
 188                 printk("AC status = %d\n", ret);
 189                 return ret;
 190         }
 191         case SHARPSL_STATUS_FATAL: {
 192                 int ret = GPLR & COLLIE_GPIO_MAIN_BAT_LOW;
 193                 printk("Fatal bat = %d\n", ret);
 194                 return ret;
 195         }
 196         default:
 197                 return ~0;
 198         }
 199 }
 200
 201 struct battery_thresh collie_battery_levels_acin[] = {
 202         { 420, 100},
 203         { 417,  95},
 204         { 415,  90},
 205         { 413,  80},
 206         { 411,  75},
 207         { 408,  70},
 208         { 406,  60},
 209         { 403,  50},
 210         { 398,  40},
 211         { 391,  25},
 212         {  10,   5},
 213         {   0,   0},
 214 };
 215
 216 struct battery_thresh collie_battery_levels[] = {
 217         { 394, 100},
 218         { 390,  95},
 219         { 380,  90},
 220         { 370,  80},
 221         { 368,  75},    /* From sharp code: battery high with frontlight */
 222         { 366,  70},    /* 60..90 -- fake values invented by me for testing */
 223         { 364,  60},
 224         { 362,  50},
 225         { 360,  40},
 226         { 358,  25},    /* From sharp code: battery low with frontlight */
 227         { 356,   5},    /* From sharp code: battery verylow with frontlight */
 228         {   0,   0},
 229 };
 230
 231 struct sharpsl_charger_machinfo collie_pm_machinfo = {
 232         .init             = collie_charger_init,
 233         .read_devdata     = read_devdata,
 234         .discharge        = collie_discharge,
 235         .discharge1       = collie_discharge1,
 236         .charge           = collie_charge,
 237         .measure_temp     = collie_measure_temp,
 238         .presuspend       = collie_presuspend,
 239         .postsuspend      = collie_postsuspend,
 240         .charger_wakeup   = collie_charger_wakeup,
 241         .should_wakeup    = collie_should_wakeup,
 242         .bat_levels       = 12,
 243         .bat_levels_noac  = collie_battery_levels,
 244         .bat_levels_acin  = collie_battery_levels_acin,
 245         .status_high_acin = 368,
 246         .status_low_acin  = 358,
 247         .status_high_noac = 368,
 248         .status_low_noac  = 358,
 249         .charge_on_volt   = 350,        /* spitz uses 2.90V, but lets play it safe. */
 250         .charge_on_temp   = 550,
 251         .charge_acin_high = 550,        /* collie does not seem to have sensor for this, anyway */
 252         .charge_acin_low  = 450,        /* ignored, too */
 253         .fatal_acin_volt  = 356,
 254         .fatal_noacin_volt = 356,
 255
 256         .batfull_irq = 1,               /* We do not want periodical charge restarts */
 257 };
 258
 259 static int __init collie_pm_ucb_add(struct ucb1x00_dev *pdev)
 260 {
 261         sharpsl_pm.machinfo = &collie_pm_machinfo;
 262         ucb = pdev->ucb;
 263         return 0;
 264 }
 265
 266 static struct ucb1x00_driver collie_pm_ucb_driver = {
 267         .add            = collie_pm_ucb_add,
 268 };
 269
 270 static struct platform_device *collie_pm_device;
 271
 272 static int __init collie_pm_init(void)
 273 {
 274         int ret;
 275
 276         collie_pm_device = platform_device_alloc("sharpsl-pm", -1);
 277         if (!collie_pm_device)
 278                 return -ENOMEM;
 279
 280         collie_pm_device->dev.platform_data = &collie_pm_machinfo;
 281         ret = platform_device_add(collie_pm_device);
 282
 283         if (ret)
 284                 platform_device_put(collie_pm_device);
 285
 286         if (!ret)
 287                 ret = ucb1x00_register_driver(&collie_pm_ucb_driver);
 288
 289         return ret;
 290 }
 291
 292 static void __exit collie_pm_exit(void)
 293 {
 294         ucb1x00_unregister_driver(&collie_pm_ucb_driver);
 295         platform_device_unregister(collie_pm_device);
 296 }
 297
 298 module_init(collie_pm_init);
 299 module_exit(collie_pm_exit);