1/* 2 * Copyright (c) 2011, Code Aurora Forum. All rights reserved. 3 * 4 * This program is free software; you can redistribute it and/or modify 5 * it under the terms of the GNU General Public License version 2 and 6 * only version 2 as published by the Free Software Foundation. 7 * 8 * This program is distributed in the hope that it will be useful, 9 * but WITHOUT ANY WARRANTY; without even the implied warranty of 10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 11 * GNU General Public License for more details. 12 */ 13 14#define pr_fmt(fmt) "%s: " fmt, __func__ 15 16#include <linux/kernel.h> 17#include <linux/platform_device.h> 18#include <linux/slab.h> 19#include <linux/err.h> 20#include <linux/msm_ssbi.h> 21#include <linux/mfd/core.h> 22#include <linux/mfd/pm8xxx/pm8921.h> 23#include <linux/mfd/pm8xxx/core.h> 24 25#define REG_HWREV 0x002 /* PMIC4 revision */ 26#define REG_HWREV_2 0x0E8 /* PMIC4 revision 2 */ 27 28struct pm8921 { 29 struct device *dev; 30 struct pm_irq_chip *irq_chip; 31}; 32 33static int pm8921_readb(const struct device *dev, u16 addr, u8 *val) 34{ 35 const struct pm8xxx_drvdata *pm8921_drvdata = dev_get_drvdata(dev); 36 const struct pm8921 *pmic = pm8921_drvdata->pm_chip_data; 37 38 return msm_ssbi_read(pmic->dev->parent, addr, val, 1); 39} 40 41static int pm8921_writeb(const struct device *dev, u16 addr, u8 val) 42{ 43 const struct pm8xxx_drvdata *pm8921_drvdata = dev_get_drvdata(dev); 44 const struct pm8921 *pmic = pm8921_drvdata->pm_chip_data; 45 46 return msm_ssbi_write(pmic->dev->parent, addr, &val, 1); 47} 48 49static int pm8921_read_buf(const struct device *dev, u16 addr, u8 *buf, 50 int cnt) 51{ 52 const struct pm8xxx_drvdata *pm8921_drvdata = dev_get_drvdata(dev); 53 const struct pm8921 *pmic = pm8921_drvdata->pm_chip_data; 54 55 return msm_ssbi_read(pmic->dev->parent, addr, buf, cnt); 56} 57 58static int pm8921_write_buf(const struct device *dev, u16 addr, u8 *buf, 59 int cnt) 60{ 61 const struct pm8xxx_drvdata *pm8921_drvdata = dev_get_drvdata(dev); 62 const struct pm8921 *pmic = pm8921_drvdata->pm_chip_data; 63 64 return msm_ssbi_write(pmic->dev->parent, addr, buf, cnt); 65} 66 67static int pm8921_read_irq_stat(const struct device *dev, int irq) 68{ 69 const struct pm8xxx_drvdata *pm8921_drvdata = dev_get_drvdata(dev); 70 const struct pm8921 *pmic = pm8921_drvdata->pm_chip_data; 71 72 return pm8xxx_get_irq_stat(pmic->irq_chip, irq); 73} 74 75static struct pm8xxx_drvdata pm8921_drvdata = { 76 .pmic_readb = pm8921_readb, 77 .pmic_writeb = pm8921_writeb, 78 .pmic_read_buf = pm8921_read_buf, 79 .pmic_write_buf = pm8921_write_buf, 80 .pmic_read_irq_stat = pm8921_read_irq_stat, 81}; 82 83static int __devinit pm8921_add_subdevices(const struct pm8921_platform_data 84 *pdata, 85 struct pm8921 *pmic, 86 u32 rev) 87{ 88 int ret = 0, irq_base = 0; 89 struct pm_irq_chip *irq_chip; 90 91 if (pdata->irq_pdata) { 92 pdata->irq_pdata->irq_cdata.nirqs = PM8921_NR_IRQS; 93 pdata->irq_pdata->irq_cdata.rev = rev; 94 irq_base = pdata->irq_pdata->irq_base; 95 irq_chip = pm8xxx_irq_init(pmic->dev, pdata->irq_pdata); 96 97 if (IS_ERR(irq_chip)) { 98 pr_err("Failed to init interrupts ret=%ld\n", 99 PTR_ERR(irq_chip)); 100 return PTR_ERR(irq_chip); 101 } 102 pmic->irq_chip = irq_chip; 103 } 104 return ret; 105} 106 107static int __devinit pm8921_probe(struct platform_device *pdev) 108{ 109 const struct pm8921_platform_data *pdata = pdev->dev.platform_data; 110 struct pm8921 *pmic; 111 int rc; 112 u8 val; 113 u32 rev; 114 115 if (!pdata) { 116 pr_err("missing platform data\n"); 117 return -EINVAL; 118 } 119 120 pmic = kzalloc(sizeof(struct pm8921), GFP_KERNEL); 121 if (!pmic) { 122 pr_err("Cannot alloc pm8921 struct\n"); 123 return -ENOMEM; 124 } 125 126 /* Read PMIC chip revision */ 127 rc = msm_ssbi_read(pdev->dev.parent, REG_HWREV, &val, sizeof(val)); 128 if (rc) { 129 pr_err("Failed to read hw rev reg %d:rc=%d\n", REG_HWREV, rc); 130 goto err_read_rev; 131 } 132 pr_info("PMIC revision 1: %02X\n", val); 133 rev = val; 134 135 /* Read PMIC chip revision 2 */ 136 rc = msm_ssbi_read(pdev->dev.parent, REG_HWREV_2, &val, sizeof(val)); 137 if (rc) { 138 pr_err("Failed to read hw rev 2 reg %d:rc=%d\n", 139 REG_HWREV_2, rc); 140 goto err_read_rev; 141 } 142 pr_info("PMIC revision 2: %02X\n", val); 143 rev |= val << BITS_PER_BYTE; 144 145 pmic->dev = &pdev->dev; 146 pm8921_drvdata.pm_chip_data = pmic; 147 platform_set_drvdata(pdev, &pm8921_drvdata); 148 149 rc = pm8921_add_subdevices(pdata, pmic, rev); 150 if (rc) { 151 pr_err("Cannot add subdevices rc=%d\n", rc); 152 goto err; 153 } 154 155 /* gpio might not work if no irq device is found */ 156 WARN_ON(pmic->irq_chip == NULL); 157 158 return 0; 159 160err: 161 mfd_remove_devices(pmic->dev); 162 platform_set_drvdata(pdev, NULL); 163err_read_rev: 164 kfree(pmic); 165 return rc; 166} 167 168static int __devexit pm8921_remove(struct platform_device *pdev) 169{ 170 struct pm8xxx_drvdata *drvdata; 171 struct pm8921 *pmic = NULL; 172 173 drvdata = platform_get_drvdata(pdev); 174 if (drvdata) 175 pmic = drvdata->pm_chip_data; 176 if (pmic) 177 mfd_remove_devices(pmic->dev); 178 if (pmic->irq_chip) { 179 pm8xxx_irq_exit(pmic->irq_chip); 180 pmic->irq_chip = NULL; 181 } 182 platform_set_drvdata(pdev, NULL); 183 kfree(pmic); 184 185 return 0; 186} 187 188static struct platform_driver pm8921_driver = { 189 .probe = pm8921_probe, 190 .remove = __devexit_p(pm8921_remove), 191 .driver = { 192 .name = "pm8921-core", 193 .owner = THIS_MODULE, 194 }, 195}; 196 197static int __init pm8921_init(void) 198{ 199 return platform_driver_register(&pm8921_driver); 200} 201subsys_initcall(pm8921_init); 202 203static void __exit pm8921_exit(void) 204{ 205 platform_driver_unregister(&pm8921_driver); 206} 207module_exit(pm8921_exit); 208 209MODULE_LICENSE("GPL v2"); 210MODULE_DESCRIPTION("PMIC 8921 core driver"); 211MODULE_VERSION("1.0"); 212MODULE_ALIAS("platform:pm8921-core"); 213