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