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 #include <linux/gpio.h>
  26
  27 #include <asm/irq.h>
  28 #include <mach/hardware.h>
  29 #include <asm/hardware/scoop.h>
  30 #include <mach/dma.h>
  31 #include <mach/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         gpio_request(COLLIE_GPIO_CHARGE_ON, "charge on");
  63         gpio_direction_output(COLLIE_GPIO_CHARGE_ON, 1);
  64
  65         ucb1x00_io_set_dir(ucb, 0, COLLIE_TC35143_GPIO_MBAT_ON | COLLIE_TC35143_GPIO_TMP_ON |
  66                                    COLLIE_TC35143_GPIO_BBAT_ON);
  67         return;
  68 }
  69
  70 static void collie_measure_temp(int on)
  71 {
  72         if (on)
  73                 ucb1x00_io_write(ucb, COLLIE_TC35143_GPIO_TMP_ON, 0);
  74         else
  75                 ucb1x00_io_write(ucb, 0, COLLIE_TC35143_GPIO_TMP_ON);
  76 }
  77
  78 static void collie_charge(int on)
  79 {
  80         /* Zaurus seems to contain LTC1731; it should know when to
  81          * stop charging itself, so setting charge on should be
  82          * relatively harmless (as long as it is not done too often).
  83          */
  84         gpio_set_value(COLLIE_GPIO_CHARGE_ON, on);
  85 }
  86
  87 static void collie_discharge(int on)
  88 {
  89 }
  90
  91 static void collie_discharge1(int on)
  92 {
  93 }
  94
  95 static void collie_presuspend(void)
  96 {
  97 }
  98
  99 static void collie_postsuspend(void)
 100 {
 101 }
 102
 103 static int collie_should_wakeup(unsigned int resume_on_alarm)
 104 {
 105         return 0;
 106 }
 107
 108 static unsigned long collie_charger_wakeup(void)
 109 {
 110         return 0;
 111 }
 112
 113 int collie_read_backup_battery(void)
 114 {
 115         int voltage;
 116
 117         ucb1x00_adc_enable(ucb);
 118
 119         ucb1x00_io_write(ucb, COLLIE_TC35143_GPIO_BBAT_ON, 0);
 120         voltage = ucb1x00_adc_read(ucb, UCB_ADC_INP_AD1, UCB_SYNC);
 121
 122         ucb1x00_io_write(ucb, 0, COLLIE_TC35143_GPIO_BBAT_ON);
 123         ucb1x00_adc_disable(ucb);
 124
 125         printk("Backup battery = %d(%d)\n", ADCtoPower(voltage), voltage);
 126
 127         return ADCtoPower(voltage);
 128 }
 129
 130 int collie_read_main_battery(void)
 131 {
 132         int voltage, voltage_rev, voltage_volts;
 133
 134         ucb1x00_adc_enable(ucb);
 135         ucb1x00_io_write(ucb, 0, COLLIE_TC35143_GPIO_BBAT_ON);
 136         ucb1x00_io_write(ucb, COLLIE_TC35143_GPIO_MBAT_ON, 0);
 137
 138         mdelay(1);
 139         voltage = ucb1x00_adc_read(ucb, UCB_ADC_INP_AD1, UCB_SYNC);
 140
 141         ucb1x00_io_write(ucb, 0, COLLIE_TC35143_GPIO_MBAT_ON);
 142         ucb1x00_adc_disable(ucb);
 143
 144         voltage_rev = voltage + ((ad_revise * voltage) / 652);
 145         voltage_volts = ADCtoPower(voltage_rev);
 146
 147         printk("Main battery = %d(%d)\n", voltage_volts, voltage);
 148
 149         if (voltage != -1)
 150                 return voltage_volts;
 151         else
 152                 return voltage;
 153 }
 154
 155 int collie_read_temp(void)
 156 {
 157         int voltage;
 158
 159         /* According to Sharp, temp must be > 973, main battery must be < 465,
 160            FIXME: sharpsl_pm.c has both conditions negated? FIXME: values
 161            are way out of range? */
 162
 163         ucb1x00_adc_enable(ucb);
 164         ucb1x00_io_write(ucb, COLLIE_TC35143_GPIO_TMP_ON, 0);
 165         /* >1010 = battery removed, 460 = 22C ?, higher = lower temp ? */
 166         voltage = ucb1x00_adc_read(ucb, UCB_ADC_INP_AD0, UCB_SYNC);
 167         ucb1x00_io_write(ucb, 0, COLLIE_TC35143_GPIO_TMP_ON);
 168         ucb1x00_adc_disable(ucb);
 169
 170         printk("Battery temp = %d\n", voltage);
 171         return voltage;
 172 }
 173
 174 static unsigned long read_devdata(int which)
 175 {
 176         switch (which) {
 177         case SHARPSL_BATT_VOLT:
 178                 return collie_read_main_battery();
 179         case SHARPSL_BATT_TEMP:
 180                 return collie_read_temp();
 181         case SHARPSL_ACIN_VOLT:
 182                 return 500;
 183         case SHARPSL_STATUS_ACIN: {
 184                 int ret = GPLR & COLLIE_GPIO_AC_IN;
 185                 printk("AC status = %d\n", ret);
 186                 return ret;
 187         }
 188         case SHARPSL_STATUS_FATAL: {
 189                 int ret = GPLR & COLLIE_GPIO_MAIN_BAT_LOW;
 190                 printk("Fatal bat = %d\n", ret);
 191                 return ret;
 192         }
 193         default:
 194                 return ~0;
 195         }
 196 }
 197
 198 struct battery_thresh collie_battery_levels_acin[] = {
 199         { 420, 100},
 200         { 417,  95},
 201         { 415,  90},
 202         { 413,  80},
 203         { 411,  75},
 204         { 408,  70},
 205         { 406,  60},
 206         { 403,  50},
 207         { 398,  40},
 208         { 391,  25},
 209         {  10,   5},
 210         {   0,   0},
 211 };
 212
 213 struct battery_thresh collie_battery_levels[] = {
 214         { 394, 100},
 215         { 390,  95},
 216         { 380,  90},
 217         { 370,  80},
 218         { 368,  75},    /* From sharp code: battery high with frontlight */
 219         { 366,  70},    /* 60..90 -- fake values invented by me for testing */
 220         { 364,  60},
 221         { 362,  50},
 222         { 360,  40},
 223         { 358,  25},    /* From sharp code: battery low with frontlight */
 224         { 356,   5},    /* From sharp code: battery verylow with frontlight */
 225         {   0,   0},
 226 };
 227
 228 struct sharpsl_charger_machinfo collie_pm_machinfo = {
 229         .init             = collie_charger_init,
 230         .read_devdata     = read_devdata,
 231         .discharge        = collie_discharge,
 232         .discharge1       = collie_discharge1,
 233         .charge           = collie_charge,
 234         .measure_temp     = collie_measure_temp,
 235         .presuspend       = collie_presuspend,
 236         .postsuspend      = collie_postsuspend,
 237         .charger_wakeup   = collie_charger_wakeup,
 238         .should_wakeup    = collie_should_wakeup,
 239         .bat_levels       = 12,
 240         .bat_levels_noac  = collie_battery_levels,
 241         .bat_levels_acin  = collie_battery_levels_acin,
 242         .status_high_acin = 368,
 243         .status_low_acin  = 358,
 244         .status_high_noac = 368,
 245         .status_low_noac  = 358,
 246         .charge_on_volt   = 350,        /* spitz uses 2.90V, but lets play it safe. */
 247         .charge_on_temp   = 550,
 248         .charge_acin_high = 550,        /* collie does not seem to have sensor for this, anyway */
 249         .charge_acin_low  = 450,        /* ignored, too */
 250         .fatal_acin_volt  = 356,
 251         .fatal_noacin_volt = 356,
 252
 253         .batfull_irq = 1,               /* We do not want periodical charge restarts */
 254 };
 255
 256 static int __init collie_pm_ucb_add(struct ucb1x00_dev *pdev)
 257 {
 258         sharpsl_pm.machinfo = &collie_pm_machinfo;
 259         ucb = pdev->ucb;
 260         return 0;
 261 }
 262
 263 static struct ucb1x00_driver collie_pm_ucb_driver = {
 264         .add    = collie_pm_ucb_add,
 265 };
 266
 267 static struct platform_device *collie_pm_device;
 268
 269 static int __init collie_pm_init(void)
 270 {
 271         int ret;
 272
 273         collie_pm_device = platform_device_alloc("sharpsl-pm", -1);
 274         if (!collie_pm_device)
 275                 return -ENOMEM;
 276
 277         collie_pm_device->dev.platform_data = &collie_pm_machinfo;
 278         ret = platform_device_add(collie_pm_device);
 279
 280         if (ret)
 281                 platform_device_put(collie_pm_device);
 282
 283         if (!ret)
 284                 ret = ucb1x00_register_driver(&collie_pm_ucb_driver);
 285
 286         return ret;
 287 }
 288
 289 static void __exit collie_pm_exit(void)
 290 {
 291         ucb1x00_unregister_driver(&collie_pm_ucb_driver);
 292         platform_device_unregister(collie_pm_device);
 293 }
 294
 295 module_init(collie_pm_init);
 296 module_exit(collie_pm_exit);