/* * Base driver for Maxim MAX8925 * * Copyright (C) 2009 Marvell International Ltd. * Haojian Zhuang * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #include #include #include #include #include #include #include #define IRQ_MODE_STATUS 0 #define IRQ_MODE_MASK 1 static int __get_irq_offset(struct max8925_chip *chip, int irq, int mode, int *offset, int *bit) { if (!offset || !bit) return -EINVAL; switch (chip->chip_id) { case MAX8925_GPM: *bit = irq % BITS_PER_BYTE; if (irq < (BITS_PER_BYTE << 1)) { /* irq = [0,15] */ *offset = (mode) ? MAX8925_CHG_IRQ1_MASK : MAX8925_CHG_IRQ1; if (irq >= BITS_PER_BYTE) (*offset)++; } else { /* irq = [16,31] */ *offset = (mode) ? MAX8925_ON_OFF_IRQ1_MASK : MAX8925_ON_OFF_IRQ1; if (irq >= (BITS_PER_BYTE * 3)) (*offset)++; } break; case MAX8925_ADC: *bit = irq % BITS_PER_BYTE; *offset = (mode) ? MAX8925_TSC_IRQ_MASK : MAX8925_TSC_IRQ; break; default: goto out; } return 0; out: dev_err(chip->dev, "Wrong irq #%d is assigned\n", irq); return -EINVAL; } static int __check_irq(int irq) { if ((irq < 0) || (irq >= MAX8925_NUM_IRQ)) return -EINVAL; return 0; } int max8925_mask_irq(struct max8925_chip *chip, int irq) { int offset, bit, ret; ret = __get_irq_offset(chip, irq, IRQ_MODE_MASK, &offset, &bit); if (ret < 0) return ret; ret = max8925_set_bits(chip->i2c, offset, 1 << bit, 1 << bit); return ret; } int max8925_unmask_irq(struct max8925_chip *chip, int irq) { int offset, bit, ret; ret = __get_irq_offset(chip, irq, IRQ_MODE_MASK, &offset, &bit); if (ret < 0) return ret; ret = max8925_set_bits(chip->i2c, offset, 1 << bit, 0); return ret; } #define INT_STATUS_NUM (MAX8925_NUM_IRQ / BITS_PER_BYTE) static irqreturn_t max8925_irq_thread(int irq, void *data) { struct max8925_chip *chip = data; unsigned long irq_status[INT_STATUS_NUM]; unsigned char status_buf[INT_STATUS_NUM << 1]; int i, ret; memset(irq_status, 0, sizeof(unsigned long) * INT_STATUS_NUM); /* all these interrupt status registers are read-only */ switch (chip->chip_id) { case MAX8925_GPM: ret = max8925_bulk_read(chip->i2c, MAX8925_CHG_IRQ1, 4, status_buf); if (ret < 0) goto out; ret = max8925_bulk_read(chip->i2c, MAX8925_ON_OFF_IRQ1, 2, &status_buf[4]); if (ret < 0) goto out; ret = max8925_bulk_read(chip->i2c, MAX8925_ON_OFF_IRQ2, 2, &status_buf[6]); if (ret < 0) goto out; /* clear masked interrupt status */ status_buf[0] &= (~status_buf[2] & CHG_IRQ1_MASK); irq_status[0] |= status_buf[0]; status_buf[1] &= (~status_buf[3] & CHG_IRQ2_MASK); irq_status[0] |= (status_buf[1] << BITS_PER_BYTE); status_buf[4] &= (~status_buf[5] & ON_OFF_IRQ1_MASK); irq_status[0] |= (status_buf[4] << (BITS_PER_BYTE * 2)); status_buf[6] &= (~status_buf[7] & ON_OFF_IRQ2_MASK); irq_status[0] |= (status_buf[6] << (BITS_PER_BYTE * 3)); break; case MAX8925_ADC: ret = max8925_bulk_read(chip->i2c, MAX8925_TSC_IRQ, 2, status_buf); if (ret < 0) goto out; /* clear masked interrupt status */ status_buf[0] &= (~status_buf[1] & TSC_IRQ_MASK); irq_status[0] |= status_buf[0]; break; default: goto out; } for_each_bit(i, &irq_status[0], MAX8925_NUM_IRQ) { clear_bit(i, irq_status); dev_dbg(chip->dev, "Servicing IRQ #%d in %s\n", i, chip->name); mutex_lock(&chip->irq_lock); if (chip->irq[i].handler) chip->irq[i].handler(i, chip->irq[i].data); else { max8925_mask_irq(chip, i); dev_err(chip->dev, "Noboday cares IRQ #%d in %s. " "Now mask it.\n", i, chip->name); } mutex_unlock(&chip->irq_lock); } out: return IRQ_HANDLED; } int max8925_request_irq(struct max8925_chip *chip, int irq, irq_handler_t handler, void *data) { if ((__check_irq(irq) < 0) || !handler) return -EINVAL; mutex_lock(&chip->irq_lock); chip->irq[irq].handler = handler; chip->irq[irq].data = data; mutex_unlock(&chip->irq_lock); return 0; } EXPORT_SYMBOL(max8925_request_irq); int max8925_free_irq(struct max8925_chip *chip, int irq) { if (__check_irq(irq) < 0) return -EINVAL; mutex_lock(&chip->irq_lock); chip->irq[irq].handler = NULL; chip->irq[irq].data = NULL; mutex_unlock(&chip->irq_lock); return 0; } EXPORT_SYMBOL(max8925_free_irq); static int __devinit device_gpm_init(struct max8925_chip *chip, struct i2c_client *i2c, struct max8925_platform_data *pdata) { int ret; /* mask all IRQs */ ret = max8925_set_bits(i2c, MAX8925_CHG_IRQ1_MASK, 0x7, 0x7); if (ret < 0) goto out; ret = max8925_set_bits(i2c, MAX8925_CHG_IRQ2_MASK, 0xff, 0xff); if (ret < 0) goto out; ret = max8925_set_bits(i2c, MAX8925_ON_OFF_IRQ1_MASK, 0xff, 0xff); if (ret < 0) goto out; ret = max8925_set_bits(i2c, MAX8925_ON_OFF_IRQ2_MASK, 0x3, 0x3); if (ret < 0) goto out; chip->name = "GPM"; memset(chip->irq, 0, sizeof(struct max8925_irq) * MAX8925_NUM_IRQ); ret = request_threaded_irq(i2c->irq, NULL, max8925_irq_thread, IRQF_ONESHOT | IRQF_TRIGGER_LOW, "max8925-gpm", chip); if (ret < 0) { dev_err(chip->dev, "Failed to request IRQ #%d.\n", i2c->irq); goto out; } chip->chip_irq = i2c->irq; /* enable hard-reset for ONKEY power-off */ max8925_set_bits(i2c, MAX8925_SYSENSEL, 0x80, 0x80); out: return ret; } static int __devinit device_adc_init(struct max8925_chip *chip, struct i2c_client *i2c, struct max8925_platform_data *pdata) { int ret; /* mask all IRQs */ ret = max8925_set_bits(i2c, MAX8925_TSC_IRQ_MASK, 3, 3); chip->name = "ADC"; memset(chip->irq, 0, sizeof(struct max8925_irq) * MAX8925_NUM_IRQ); ret = request_threaded_irq(i2c->irq, NULL, max8925_irq_thread, IRQF_ONESHOT | IRQF_TRIGGER_LOW, "max8925-adc", chip); if (ret < 0) { dev_err(chip->dev, "Failed to request IRQ #%d.\n", i2c->irq); goto out; } chip->chip_irq = i2c->irq; out: return ret; } int __devinit max8925_device_init(struct max8925_chip *chip, struct max8925_platform_data *pdata) { switch (chip->chip_id) { case MAX8925_GPM: device_gpm_init(chip, chip->i2c, pdata); break; case MAX8925_ADC: device_adc_init(chip, chip->i2c, pdata); break; } return 0; } void max8925_device_exit(struct max8925_chip *chip) { if (chip->chip_irq >= 0) free_irq(chip->chip_irq, chip); } MODULE_DESCRIPTION("PMIC Driver for Maxim MAX8925"); MODULE_AUTHOR("Haojian Zhuang